CONFIG_AR71XX_MACH_RB750=y
CONFIG_AR71XX_MACH_RW2458N=y
CONFIG_AR71XX_MACH_TEW_632BRP=y
+CONFIG_AR71XX_MACH_TL_MR3020=y
CONFIG_AR71XX_MACH_TL_MR3X20=y
CONFIG_AR71XX_MACH_TL_WA901ND=y
CONFIG_AR71XX_MACH_TL_WA901ND_V2=y
CONFIG_AR71XX_MACH_TL_WR1043ND=y
CONFIG_AR71XX_MACH_TL_WR703N=y
-CONFIG_AR71XX_MACH_TL_MR3020=y
CONFIG_AR71XX_MACH_TL_WR741ND=y
CONFIG_AR71XX_MACH_TL_WR741ND_V4=y
CONFIG_AR71XX_MACH_TL_WR841N_V1=y
--- /dev/null
+From eee16330c9de9adf7880cce9f1d32e13f89706bb Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Tue, 11 Jan 2011 13:16:47 +0000
+Subject: MIPS: Add crash and kdump support
+
+From: http://patchwork.linux-mips.org/patch/1025/
+
+Hello folks,
+
+Please find here MIPS crash and kdump patches.
+This is patch set of 3 patches:
+1. generic MIPS changes (kernel);
+2. MIPS Cavium Octeon board kexec/kdump code (kernel);
+3. Kexec user space MIPS changes.
+
+Patches were tested on the latest linux-mips@ git kernel and the latest
+kexec-tools git on Cavium Octeon 50xx board.
+
+I also made the same code working on RMI XLR/XLS boards for both
+mips32 and mips64 kernels.
+
+Best regards,
+Maxim Uvarov.
+
+------
+[ Zhangjin: Several trivial building failure has been fixed.
+
+Note: the 2nd patch can not be cleanly applied, but may be a good
+reference for the other board development:
+
+ + MIPS Cavium Octeon board kexec,kdump support
+ http://patchwork.linux-mips.org/patch/1026/
+
+And the 3rd patch has already been merged into the mainline kexec-tools:
+
+ + some kexec MIPS improvements
+ http://patchwork.linux-mips.org/patch/1027/
+
+kexec-tools is available here:
+
+ + http://horms.net/projects/kexec/
+ git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
+]
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+(limited to 'arch/mips/kernel')
+
+--- a/arch/mips/kernel/Makefile
++++ b/arch/mips/kernel/Makefile
+@@ -92,7 +92,8 @@ obj-$(CONFIG_I8253) += i8253.o
+
+ obj-$(CONFIG_GPIO_TXX9) += gpio_txx9.o
+
+-obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
++obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o crash.o
++obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
+ obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+ obj-$(CONFIG_SPINLOCK_TEST) += spinlock_test.o
+ obj-$(CONFIG_MIPS_MACHINE) += mips_machine.o
+--- /dev/null
++++ b/arch/mips/kernel/crash.c
+@@ -0,0 +1,75 @@
++#include <linux/kernel.h>
++#include <linux/smp.h>
++#include <linux/reboot.h>
++#include <linux/kexec.h>
++#include <linux/bootmem.h>
++#include <linux/crash_dump.h>
++#include <linux/delay.h>
++#include <linux/init.h>
++#include <linux/irq.h>
++#include <linux/types.h>
++#include <linux/sched.h>
++
++#ifdef CONFIG_CRASH_DUMP
++unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
++#endif
++
++/* This keeps a track of which one is crashing cpu. */
++int crashing_cpu = -1;
++static cpumask_t cpus_in_crash = CPU_MASK_NONE;
++
++#ifdef CONFIG_SMP
++void crash_shutdown_secondary(void *ignore)
++{
++ struct pt_regs *regs;
++ int cpu = smp_processor_id();
++
++ regs = task_pt_regs(current);
++
++ if (!cpu_online(cpu))
++ return;
++
++ local_irq_disable();
++ if (!cpu_isset(cpu, cpus_in_crash))
++ crash_save_cpu(regs, cpu);
++ cpu_set(cpu, cpus_in_crash);
++
++ while (!atomic_read(&kexec_ready_to_reboot))
++ cpu_relax();
++ relocated_kexec_smp_wait(NULL);
++ /* NOTREACHED */
++}
++
++static void crash_kexec_prepare_cpus(void)
++{
++ unsigned int msecs;
++
++ unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
++
++ dump_send_ipi(crash_shutdown_secondary);
++ smp_wmb();
++
++ /*
++ * The crash CPU sends an IPI and wait for other CPUs to
++ * respond. Delay of at least 10 seconds.
++ */
++ printk(KERN_EMERG "Sending IPI to other cpus...\n");
++ msecs = 10000;
++ while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
++ cpu_relax();
++ mdelay(1);
++ }
++}
++
++#else
++static void crash_kexec_prepare_cpus(void) {}
++#endif
++
++void default_machine_crash_shutdown(struct pt_regs *regs)
++{
++ local_irq_disable();
++ crashing_cpu = smp_processor_id();
++ crash_save_cpu(regs, crashing_cpu);
++ crash_kexec_prepare_cpus();
++ cpu_set(crashing_cpu, cpus_in_crash);
++}
+--- /dev/null
++++ b/arch/mips/kernel/crash_dump.c
+@@ -0,0 +1,86 @@
++#include <linux/highmem.h>
++#include <linux/bootmem.h>
++#include <linux/crash_dump.h>
++#include <asm/uaccess.h>
++
++#ifdef CONFIG_PROC_VMCORE
++static int __init parse_elfcorehdr(char *p)
++{
++ if (p)
++ elfcorehdr_addr = memparse(p, &p);
++ return 1;
++}
++__setup("elfcorehdr=", parse_elfcorehdr);
++#endif
++
++static int __init parse_savemaxmem(char *p)
++{
++ if (p)
++ saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1;
++
++ return 1;
++}
++__setup("savemaxmem=", parse_savemaxmem);
++
++
++static void *kdump_buf_page;
++
++/**
++ * copy_oldmem_page - copy one page from "oldmem"
++ * @pfn: page frame number to be copied
++ * @buf: target memory address for the copy; this can be in kernel address
++ * space or user address space (see @userbuf)
++ * @csize: number of bytes to copy
++ * @offset: offset in bytes into the page (based on pfn) to begin the copy
++ * @userbuf: if set, @buf is in user address space, use copy_to_user(),
++ * otherwise @buf is in kernel address space, use memcpy().
++ *
++ * Copy a page from "oldmem". For this page, there is no pte mapped
++ * in the current kernel.
++ *
++ * Calling copy_to_user() in atomic context is not desirable. Hence first
++ * copying the data to a pre-allocated kernel page and then copying to user
++ * space in non-atomic context.
++ */
++ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
++ size_t csize, unsigned long offset, int userbuf)
++{
++ void *vaddr;
++
++ if (!csize)
++ return 0;
++
++ vaddr = kmap_atomic_pfn(pfn, KM_PTE0);
++
++ if (!userbuf) {
++ memcpy(buf, (vaddr + offset), csize);
++ kunmap_atomic(vaddr, KM_PTE0);
++ } else {
++ if (!kdump_buf_page) {
++ printk(KERN_WARNING "Kdump: Kdump buffer page not"
++ " allocated\n");
++ return -EFAULT;
++ }
++ copy_page(kdump_buf_page, vaddr);
++ kunmap_atomic(vaddr, KM_PTE0);
++ if (copy_to_user(buf, (kdump_buf_page + offset), csize))
++ return -EFAULT;
++ }
++
++ return csize;
++}
++
++static int __init kdump_buf_page_init(void)
++{
++ int ret = 0;
++
++ kdump_buf_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
++ if (!kdump_buf_page) {
++ printk(KERN_WARNING "Kdump: Failed to allocate kdump buffer"
++ " page\n");
++ ret = -ENOMEM;
++ }
++
++ return ret;
++}
++arch_initcall(kdump_buf_page_init);
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -19,9 +19,19 @@ extern const size_t relocate_new_kernel_
+ extern unsigned long kexec_start_address;
+ extern unsigned long kexec_indirection_page;
+
++int (*_machine_kexec_prepare)(struct kimage *) = NULL;
++void (*_machine_kexec_shutdown)(void) = NULL;
++void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
++#ifdef CONFIG_SMP
++void (*relocated_kexec_smp_wait) (void *);
++atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
++#endif
++
+ int
+ machine_kexec_prepare(struct kimage *kimage)
+ {
++ if (_machine_kexec_prepare)
++ return _machine_kexec_prepare(kimage);
+ return 0;
+ }
+
+@@ -33,11 +43,17 @@ machine_kexec_cleanup(struct kimage *kim
+ void
+ machine_shutdown(void)
+ {
++ if (_machine_kexec_shutdown)
++ _machine_kexec_shutdown();
+ }
+
+ void
+ machine_crash_shutdown(struct pt_regs *regs)
+ {
++ if (_machine_crash_shutdown)
++ _machine_crash_shutdown(regs);
++ else
++ default_machine_crash_shutdown(regs);
+ }
+
+ typedef void (*noretfun_t)(void) __attribute__((noreturn));
+@@ -52,7 +68,9 @@ machine_kexec(struct kimage *image)
+ reboot_code_buffer =
+ (unsigned long)page_address(image->control_code_page);
+
+- kexec_start_address = (unsigned long) phys_to_virt(image->start);
++ kexec_start_address =
++ (unsigned long) phys_to_virt(image->start);
++
+ kexec_indirection_page =
+ (unsigned long) phys_to_virt(image->head & PAGE_MASK);
+
+@@ -63,7 +81,7 @@ machine_kexec(struct kimage *image)
+ * The generic kexec code builds a page list with physical
+ * addresses. they are directly accessible through KSEG0 (or
+ * CKSEG0 or XPHYS if on 64bit system), hence the
+- * pys_to_virt() call.
++ * phys_to_virt() call.
+ */
+ for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
+ ptr = (entry & IND_INDIRECTION) ?
+@@ -81,5 +99,13 @@ machine_kexec(struct kimage *image)
+ printk("Will call new kernel at %08lx\n", image->start);
+ printk("Bye ...\n");
+ __flush_cache_all();
++#ifdef CONFIG_SMP
++ /* All secondary cpus now may jump to kexec_wait cycle */
++ relocated_kexec_smp_wait = reboot_code_buffer +
++ (void *)(kexec_smp_wait - relocate_new_kernel);
++ smp_wmb();
++ atomic_set(&kexec_ready_to_reboot, 1);
++#endif
+ ((noretfun_t) reboot_code_buffer)();
+ }
++
+--- a/arch/mips/kernel/relocate_kernel.S
++++ b/arch/mips/kernel/relocate_kernel.S
+@@ -15,6 +15,11 @@
+ #include <asm/addrspace.h>
+
+ LEAF(relocate_new_kernel)
++ PTR_L a0, arg0
++ PTR_L a1, arg1
++ PTR_L a2, arg2
++ PTR_L a3, arg3
++
+ PTR_L s0, kexec_indirection_page
+ PTR_L s1, kexec_start_address
+
+@@ -26,7 +31,6 @@ process_entry:
+ and s3, s2, 0x1
+ beq s3, zero, 1f
+ and s4, s2, ~0x1 /* store destination addr in s4 */
+- move a0, s4
+ b process_entry
+
+ 1:
+@@ -60,23 +64,100 @@ copy_word:
+ b process_entry
+
+ done:
++#ifdef CONFIG_SMP
++ /* kexec_flag reset is signal to other CPUs what kernel
++ was moved to it's location. Note - we need relocated address
++ of kexec_flag. */
++
++ bal 1f
++ 1: move t1,ra;
++ PTR_LA t2,1b
++ PTR_LA t0,kexec_flag
++ PTR_SUB t0,t0,t2;
++ PTR_ADD t0,t1,t0;
++ LONG_S zero,(t0)
++#endif
++
++ sync
+ /* jump to kexec_start_address */
+ j s1
+ END(relocate_new_kernel)
+
+-kexec_start_address:
+- EXPORT(kexec_start_address)
++#ifdef CONFIG_SMP
++/*
++ * Other CPUs should wait until code is relocated and
++ * then start at entry (?) point.
++ */
++LEAF(kexec_smp_wait)
++ PTR_L a0, s_arg0
++ PTR_L a1, s_arg1
++ PTR_L a2, s_arg2
++ PTR_L a3, s_arg3
++ PTR_L s1, kexec_start_address
++
++ /* Non-relocated address works for args and kexec_start_address ( old
++ * kernel is not overwritten). But we need relocated address of
++ * kexec_flag.
++ */
++
++ bal 1f
++1: move t1,ra;
++ PTR_LA t2,1b
++ PTR_LA t0,kexec_flag
++ PTR_SUB t0,t0,t2;
++ PTR_ADD t0,t1,t0;
++
++1: LONG_L s0, (t0)
++ bne s0, zero,1b
++
++ sync
++ j s1
++ END(kexec_smp_wait)
++#endif
++
++#ifdef __mips64
++ /* all PTR's must be aligned to 8 byte in 64-bit mode */
++ .align 3
++#endif
++
++/* All parameters to new kernel are passed in registers a0-a3.
++ * kexec_args[0..3] are uses to prepare register values.
++ */
++
++EXPORT(kexec_args)
++arg0: PTR 0x0
++arg1: PTR 0x0
++arg2: PTR 0x0
++arg3: PTR 0x0
++ .size kexec_args,PTRSIZE*4
++
++#ifdef CONFIG_SMP
++/*
++ * Secondary CPUs may have different kernel parameters in
++ * their registers a0-a3. secondary_kexec_args[0..3] are used
++ * to prepare register values.
++ */
++EXPORT(secondary_kexec_args)
++s_arg0: PTR 0x0
++s_arg1: PTR 0x0
++s_arg2: PTR 0x0
++s_arg3: PTR 0x0
++ .size secondary_kexec_args,PTRSIZE*4
++kexec_flag:
++ LONG 0x1
++
++#endif
++
++EXPORT(kexec_start_address)
+ PTR 0x0
+ .size kexec_start_address, PTRSIZE
+
+-kexec_indirection_page:
+- EXPORT(kexec_indirection_page)
++EXPORT(kexec_indirection_page)
+ PTR 0
+ .size kexec_indirection_page, PTRSIZE
+
+ relocate_new_kernel_end:
+
+-relocate_new_kernel_size:
+- EXPORT(relocate_new_kernel_size)
++EXPORT(relocate_new_kernel_size)
+ PTR relocate_new_kernel_end - relocate_new_kernel
+ .size relocate_new_kernel_size, PTRSIZE
+--- a/arch/mips/kernel/setup.c
++++ b/arch/mips/kernel/setup.c
+@@ -21,6 +21,7 @@
+ #include <linux/console.h>
+ #include <linux/pfn.h>
+ #include <linux/debugfs.h>
++#include <linux/kexec.h>
+
+ #include <asm/addrspace.h>
+ #include <asm/bootinfo.h>
+@@ -488,12 +489,62 @@ static void __init arch_mem_init(char **
+ }
+
+ bootmem_init();
++#ifdef CONFIG_KEXEC
++ if (crashk_res.start != crashk_res.end)
++ reserve_bootmem(crashk_res.start,
++ crashk_res.end - crashk_res.start + 1,
++ BOOTMEM_DEFAULT);
++#endif
+ device_tree_init();
+ sparse_init();
+ plat_swiotlb_setup();
+ paging_init();
+ }
+
++#ifdef CONFIG_KEXEC
++static inline unsigned long long get_total_mem(void)
++{
++ unsigned long long total;
++ total = max_pfn - min_low_pfn;
++ return total << PAGE_SHIFT;
++}
++
++static void __init mips_parse_crashkernel(void)
++{
++ unsigned long long total_mem;
++ unsigned long long crash_size, crash_base;
++ int ret;
++
++ total_mem = get_total_mem();
++ ret = parse_crashkernel(boot_command_line, total_mem,
++ &crash_size, &crash_base);
++ if (ret != 0 || crash_size <= 0)
++ return;
++
++ crashk_res.start = crash_base;
++ crashk_res.end = crash_base + crash_size - 1;
++}
++static void __init request_crashkernel(struct resource *res)
++{
++ int ret;
++
++ ret = request_resource(res, &crashk_res);
++ if (!ret)
++ printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
++ "for crashkernel\n",
++ (unsigned long)((crashk_res.end -
++ crashk_res.start + 1) >> 20),
++ (unsigned long)(crashk_res.start >> 20));
++}
++#else
++static void __init mips_parse_crashkernel(void)
++{
++}
++static void __init request_crashkernel(struct resource *res)
++{
++}
++#endif
++
+ static void __init resource_init(void)
+ {
+ int i;
+@@ -509,6 +560,8 @@ static void __init resource_init(void)
+ /*
+ * Request address space for all standard RAM.
+ */
++ mips_parse_crashkernel();
++
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ struct resource *res;
+ unsigned long start, end;
+@@ -544,6 +597,7 @@ static void __init resource_init(void)
+ */
+ request_resource(res, &code_resource);
+ request_resource(res, &data_resource);
++ request_crashkernel(res);
+ }
+ }
+
+--- a/arch/mips/kernel/smp.c
++++ b/arch/mips/kernel/smp.c
+@@ -433,3 +433,21 @@ void flush_tlb_one(unsigned long vaddr)
+
+ EXPORT_SYMBOL(flush_tlb_page);
+ EXPORT_SYMBOL(flush_tlb_one);
++
++#if defined(CONFIG_KEXEC)
++void (*dump_ipi_function_ptr)(void *) = NULL;
++void dump_send_ipi(void (*dump_ipi_callback)(void *))
++{
++ int i;
++ int cpu = smp_processor_id();
++
++ dump_ipi_function_ptr = dump_ipi_callback;
++ smp_mb();
++ for_each_online_cpu(i)
++ if (i != cpu)
++ core_send_ipi(i, SMP_DUMP);
++
++}
++EXPORT_SYMBOL(dump_send_ipi);
++#endif
++
+--- a/arch/mips/include/asm/kexec.h
++++ b/arch/mips/include/asm/kexec.h
+@@ -9,22 +9,45 @@
+ #ifndef _MIPS_KEXEC
+ # define _MIPS_KEXEC
+
++#include <asm/stacktrace.h>
++
++extern unsigned long long elfcorehdr_addr;
++
+ /* Maximum physical address we can use pages from */
+ #define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000)
+ /* Maximum address we can reach in physical address mode */
+ #define KEXEC_DESTINATION_MEMORY_LIMIT (0x20000000)
+ /* Maximum address we can use for the control code buffer */
+ #define KEXEC_CONTROL_MEMORY_LIMIT (0x20000000)
+-
+-#define KEXEC_CONTROL_PAGE_SIZE 4096
++/* Reserve 3*4096 bytes for board-specific info */
++#define KEXEC_CONTROL_PAGE_SIZE (4096 + 3*4096)
+
+ /* The native architecture */
+ #define KEXEC_ARCH KEXEC_ARCH_MIPS
++#define MAX_NOTE_BYTES 1024
+
+ static inline void crash_setup_regs(struct pt_regs *newregs,
+- struct pt_regs *oldregs)
++ struct pt_regs *oldregs)
+ {
+- /* Dummy implementation for now */
++ if (oldregs)
++ memcpy(newregs, oldregs, sizeof(*newregs));
++ else
++ prepare_frametrace(newregs);
+ }
+
++#ifdef CONFIG_KEXEC
++struct kimage;
++extern unsigned long kexec_args[4];
++extern int (*_machine_kexec_prepare)(struct kimage *);
++extern void (*_machine_kexec_shutdown)(void);
++extern void (*_machine_crash_shutdown)(struct pt_regs *regs);
++extern void default_machine_crash_shutdown(struct pt_regs *regs);
++#ifdef CONFIG_SMP
++extern const unsigned char kexec_smp_wait[];
++extern unsigned long secondary_kexec_args[4];
++extern void (*relocated_kexec_smp_wait) (void *);
++extern atomic_t kexec_ready_to_reboot;
++#endif
++#endif
++
+ #endif /* !_MIPS_KEXEC */
+--- a/arch/mips/include/asm/smp.h
++++ b/arch/mips/include/asm/smp.h
+@@ -40,6 +40,8 @@ extern int __cpu_logical_map[NR_CPUS];
+ #define SMP_CALL_FUNCTION 0x2
+ /* Octeon - Tell another core to flush its icache */
+ #define SMP_ICACHE_FLUSH 0x4
++/* Used by kexec crashdump to save all cpu's state */
++#define SMP_DUMP 0x8
+
+ extern volatile cpumask_t cpu_callin_map;
+
+@@ -91,4 +93,9 @@ static inline void arch_send_call_functi
+ mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
+ }
+
++extern void core_send_ipi(int cpu, unsigned int action);
++#if defined(CONFIG_KEXEC)
++extern void (*dump_ipi_function_ptr)(void *);
++void dump_send_ipi(void (*dump_ipi_callback)(void *));
++#endif
+ #endif /* __ASM_SMP_H */
--- /dev/null
+From 03cd81fbca6b91317ec1a7b3b3c09fb8d08f83a6 Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Tue, 11 Jan 2011 18:42:08 +0000
+Subject: MIPS: Kexec: Enhance the support
+
+Changes:
+ o Print more information in machine_kexec() for debugging
+ E.g. with this information, the kexec_start_address has been found
+ it was wrong with 64bit kernel / o32 kexec-tools. Which must be
+ fixed later.
+ o Link relocate_kernel.S to a section for future extension
+ This allows more functions can be added for the kexec relocation
+ part even written in C. to add code into that section, you just need
+ to mark your function or data with __kexec or
+ __attribute__((__section__(".__kexec.relocate")))
+
+TODO:
+
+1. Make 64bit kernel / o32|n32|64 kexec-tools works
+
+Fix the user-space kexec-tools, seems the tool only work for 32bit
+machine. So, we need to add 64bit support for it. The address of the
+entry point(kexec_start_address) is wrong and make the "kexec -e" fail.
+the real entry point must be read from the new kernel image by the
+user-space kexec-tools, otherwise, it will not work. The above 64bit
+support tested is 64bit kernel with o32 user-space kexec-tools. The root
+cause may be the different definition of virt_to_phys() and
+phys_to_virt() in the kexec-tools and kernel space for 64bit system /
+o32 kernel.
+
+Ref: http://www.linux-mips.org/archives/linux-mips/2009-08/msg00149.html
+
+2. Pass the arguments from kexec-tools to the new kernel image
+
+Please refer to: "MIPS: Loongson: Kexec: Pass parameters to new kernel"
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+--- a/arch/mips/include/asm/kexec.h
++++ b/arch/mips/include/asm/kexec.h
+@@ -36,6 +36,16 @@ static inline void crash_setup_regs(stru
+ }
+
+ #ifdef CONFIG_KEXEC
++
++#define __kexec __attribute__((__section__(".__kexec.relocate")))
++
++/* The linker tells us where the relocate_new_kernel part is. */
++extern const unsigned char __start___kexec_relocate;
++extern const unsigned char __end___kexec_relocate;
++
++extern unsigned long kexec_start_address;
++extern unsigned long kexec_indirection_page;
++
+ struct kimage;
+ extern unsigned long kexec_args[4];
+ extern int (*_machine_kexec_prepare)(struct kimage *);
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -13,12 +13,6 @@
+ #include <asm/cacheflush.h>
+ #include <asm/page.h>
+
+-extern const unsigned char relocate_new_kernel[];
+-extern const size_t relocate_new_kernel_size;
+-
+-extern unsigned long kexec_start_address;
+-extern unsigned long kexec_indirection_page;
+-
+ int (*_machine_kexec_prepare)(struct kimage *) = NULL;
+ void (*_machine_kexec_shutdown)(void) = NULL;
+ void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
+@@ -61,21 +55,34 @@ typedef void (*noretfun_t)(void) __attri
+ void
+ machine_kexec(struct kimage *image)
+ {
++ unsigned long kexec_relocate_size;
+ unsigned long reboot_code_buffer;
+ unsigned long entry;
+ unsigned long *ptr;
+
++ kexec_relocate_size = (unsigned long)(&__end___kexec_relocate) -
++ (unsigned long)(&__start___kexec_relocate);
++ pr_info("kexec_relocate_size = %lu\n", kexec_relocate_size);
++
+ reboot_code_buffer =
+ (unsigned long)page_address(image->control_code_page);
++ pr_info("reboot_code_buffer = %p\n", (void *)reboot_code_buffer);
+
+ kexec_start_address =
+ (unsigned long) phys_to_virt(image->start);
++ pr_info("kexec_start_address(entry point of new kernel) = %p\n",
++ (void *)kexec_start_address);
+
+ kexec_indirection_page =
+ (unsigned long) phys_to_virt(image->head & PAGE_MASK);
++ pr_info("kexec_indirection_page = %p\n",
++ (void *)kexec_indirection_page);
+
+- memcpy((void*)reboot_code_buffer, relocate_new_kernel,
+- relocate_new_kernel_size);
++ memcpy((void *)reboot_code_buffer, &__start___kexec_relocate,
++ kexec_relocate_size);
++
++ pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
++ &__start___kexec_relocate, (void *)reboot_code_buffer);
+
+ /*
+ * The generic kexec code builds a page list with physical
+@@ -96,8 +103,8 @@ machine_kexec(struct kimage *image)
+ */
+ local_irq_disable();
+
+- printk("Will call new kernel at %08lx\n", image->start);
+- printk("Bye ...\n");
++ pr_info("Will call new kernel at %p\n", (void *)kexec_start_address);
++ pr_info("Bye ...\n");
+ __flush_cache_all();
+ #ifdef CONFIG_SMP
+ /* All secondary cpus now may jump to kexec_wait cycle */
+@@ -108,4 +115,3 @@ machine_kexec(struct kimage *image)
+ #endif
+ ((noretfun_t) reboot_code_buffer)();
+ }
+-
+--- a/arch/mips/kernel/relocate_kernel.S
++++ b/arch/mips/kernel/relocate_kernel.S
+@@ -14,6 +14,8 @@
+ #include <asm/stackframe.h>
+ #include <asm/addrspace.h>
+
++ .section .kexec.relocate, "ax"
++
+ LEAF(relocate_new_kernel)
+ PTR_L a0, arg0
+ PTR_L a1, arg1
+@@ -155,9 +157,3 @@ EXPORT(kexec_start_address)
+ EXPORT(kexec_indirection_page)
+ PTR 0
+ .size kexec_indirection_page, PTRSIZE
+-
+-relocate_new_kernel_end:
+-
+-EXPORT(relocate_new_kernel_size)
+- PTR relocate_new_kernel_end - relocate_new_kernel
+- .size relocate_new_kernel_size, PTRSIZE
+--- a/arch/mips/kernel/vmlinux.lds.S
++++ b/arch/mips/kernel/vmlinux.lds.S
+@@ -50,6 +50,10 @@ SECTIONS
+ *(.text.*)
+ *(.fixup)
+ *(.gnu.warning)
++ __start___kexec_relocate = .;
++ KEEP(*(.kexec.relocate))
++ KEEP(*(.__kexec.relocate))
++ __end___kexec_relocate = .;
+ } :text = 0
+ _etext = .; /* End of text section */
+
--- /dev/null
+From 49d07a29653b1f2c6ae273b3d8fe93d981f43004 Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Wed, 12 Jan 2011 20:59:32 +0000
+Subject: MIPS: Kexec: Init the arguments for the new kernel image
+
+Whenever the kexec-tools pass the command lines to the new kernel image,
+init the arguments as the ones for the 1st kernel image. This fixed the
+booting failure of Kexec on YeeLoong.
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -10,6 +10,7 @@
+ #include <linux/mm.h>
+ #include <linux/delay.h>
+
++#include <asm/bootinfo.h>
+ #include <asm/cacheflush.h>
+ #include <asm/page.h>
+
+@@ -21,9 +22,30 @@ void (*relocated_kexec_smp_wait) (void *
+ atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
+ #endif
+
++static void machine_kexec_init_args(void)
++{
++ kexec_args[0] = fw_arg0;
++ kexec_args[1] = fw_arg1;
++ kexec_args[2] = fw_arg2;
++ kexec_args[3] = fw_arg3;
++
++ pr_info("kexec_args[0] (argc): %lu\n", kexec_args[0]);
++ pr_info("kexec_args[1] (argv): %p\n", (void *)kexec_args[1]);
++ pr_info("kexec_args[2] (env ): %p\n", (void *)kexec_args[2]);
++ pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
++}
++
+ int
+ machine_kexec_prepare(struct kimage *kimage)
+ {
++ /*
++ * Whenever arguments passed from kexec-tools, Init the arguments as
++ * the original ones to avoid booting failure.
++ *
++ * This can be overrided by _machine_kexec_prepare().
++ */
++ machine_kexec_init_args();
++
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
+ return 0;
--- /dev/null
+From 240c76841b26f1b09aaced33414ee1d08b6454cf Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Sat, 15 Jan 2011 12:46:03 +0000
+Subject: MIPS: Get kernel parameters from kexec-tools
+
+Before, we simply use the command lines from the original bootloader,
+but it is not convenient. Now, we accept the kernel parameters from the
+--command-line or --append option of the kexec-tools. But If not
+--command-line or --apend option indicated, will fall back to use the
+ones from the original bootloader.
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -13,6 +13,7 @@
+ #include <asm/bootinfo.h>
+ #include <asm/cacheflush.h>
+ #include <asm/page.h>
++#include <asm/uaccess.h>
+
+ int (*_machine_kexec_prepare)(struct kimage *) = NULL;
+ void (*_machine_kexec_shutdown)(void) = NULL;
+@@ -35,6 +36,56 @@ static void machine_kexec_init_args(void
+ pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
+ }
+
++#define ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
++
++int machine_kexec_pass_args(struct kimage *image)
++{
++ int i, argc = 0;
++ char *bootloader = "kexec";
++ int *kexec_argv = (int *)kexec_args[1];
++
++ for (i = 0; i < image->nr_segments; i++) {
++ if (!strncmp(bootloader, (char *)image->segment[i].buf,
++ strlen(bootloader))) {
++ /*
++ * convert command line string to array
++ * of parameters (as bootloader does).
++ */
++ /*
++ * Note: we do treat the 1st string "kexec" as an
++ * argument ;-) so, argc here is 1.
++ */
++ char *str = (char *)image->segment[i].buf;
++ char *ptr = strchr(str, ' ');
++ char *kbuf = (char *)kexec_argv[0];
++ /* Whenever --command-line or --append used, "kexec" is copied */
++ argc = 1;
++ /* Parse the offset */
++ while (ptr && (ARGV_MAX_ARGS > argc)) {
++ *ptr = '\0';
++ if (ptr[1] != ' ' && ptr[1] != '\0') {
++ int offt = (int)(ptr - str + 1);
++ kexec_argv[argc] = (int)kbuf + offt;
++ argc++;
++ }
++ ptr = strchr(ptr + 1, ' ');
++ }
++ if (argc > 1) {
++ /* Copy to kernel space */
++ copy_from_user(kbuf, (char *)image->segment[i].buf, image->segment[i].bufsz);
++ fw_arg0 = kexec_args[0] = argc;
++ }
++ break;
++ }
++ }
++
++ pr_info("argc = %lu\n", kexec_args[0]);
++ for (i = 0; i < kexec_args[0]; i++)
++ pr_info("argv[%d] = %p, %s\n", i, (char *)kexec_argv[i], (char *)kexec_argv[i]);
++
++ return 0;
++}
++
+ int
+ machine_kexec_prepare(struct kimage *kimage)
+ {
+@@ -45,6 +96,7 @@ machine_kexec_prepare(struct kimage *kim
+ * This can be overrided by _machine_kexec_prepare().
+ */
+ machine_kexec_init_args();
++ machine_kexec_pass_args(kimage);
+
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
--- /dev/null
+From 4aded085fa0057a9a1e1dcec631f950307360c1f Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Tue, 11 Jan 2011 13:46:19 +0000
+Subject: MIPS: Fix compiling failure of relocate_kernel.S
+
+The following errors is fixed with the help of <asm/asm_nosec.h>. for
+this file need to put different symbols in the same section, the
+original LEAF, NESTED and EXPORT (without explicit section indication)
+must be used, <asm/asm_nosec.h> does it.
+
+arch/mips/kernel/relocate_kernel.S: Assembler messages:
+arch/mips/kernel/relocate_kernel.S:162: Error: operation combines symbols in different segments
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+(limited to 'arch/mips/kernel')
+
+--- a/arch/mips/kernel/relocate_kernel.S
++++ b/arch/mips/kernel/relocate_kernel.S
+@@ -7,6 +7,7 @@
+ */
+
+ #include <asm/asm.h>
++#include <asm/asm_nosec.h>
+ #include <asm/asmmacro.h>
+ #include <asm/regdef.h>
+ #include <asm/page.h>
+--- /dev/null
++++ b/arch/mips/include/asm/asm_nosec.h
+@@ -0,0 +1,53 @@
++/*
++ * This file is subject to the terms and conditions of the GNU General Public
++ * License. See the file "COPYING" in the main directory of this archive
++ * for more details.
++ *
++ * Copyright (C) 1995, 1996, 1997, 1999, 2001 by Ralf Baechle
++ * Copyright (C) 1999 by Silicon Graphics, Inc.
++ * Copyright (C) 2001 MIPS Technologies, Inc.
++ * Copyright (C) 2002 Maciej W. Rozycki
++ * Copyright (C) 2010 Wu Zhangjin <wuzhangjin@gmail.com>
++ *
++ * Derive from <asm/asm.h>
++ *
++ * Override the macros without -ffunction-sections and -fdata-sections support.
++ * If several functions or data must be put in the same section, please include
++ * this header file after the <asm/asm.h> to override the generic definition.
++ */
++
++#ifndef __ASM_ASM_NOSEC_H
++#define __ASM_ASM_NOSEC_H
++
++#undef LEAF
++#undef NESTED
++#undef EXPORT
++
++/*
++ * LEAF - declare leaf routine
++ */
++#define LEAF(symbol) \
++ .globl symbol; \
++ .align 2; \
++ .type symbol, @function; \
++ .ent symbol, 0; \
++symbol: .frame sp, 0, ra
++
++/*
++ * NESTED - declare nested routine entry point
++ */
++#define NESTED(symbol, framesize, rpc) \
++ .globl symbol; \
++ .align 2; \
++ .type symbol, @function; \
++ .ent symbol, 0; \
++symbol: .frame sp, framesize, rpc
++
++/*
++ * EXPORT - export definition of symbol
++ */
++#define EXPORT(symbol) \
++ .globl symbol; \
++symbol:
++
++#endif /* __ASM_ASM_NOSEC_H */
--- /dev/null
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -23,67 +23,104 @@ void (*relocated_kexec_smp_wait) (void *
+ atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
+ #endif
+
+-static void machine_kexec_init_args(void)
++#define KEXEC_MIPS_ARGV_BUF_SIZE COMMAND_LINE_SIZE
++#define KEXEC_MIPS_ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
++
++char kexec_argv_buf[KEXEC_MIPS_ARGV_BUF_SIZE] __kexec;
++int kexec_argv[KEXEC_MIPS_ARGV_MAX_ARGS] __kexec;
++
++static void
++machine_kexec_print_args(void)
+ {
+- kexec_args[0] = fw_arg0;
+- kexec_args[1] = fw_arg1;
+- kexec_args[2] = fw_arg2;
+- kexec_args[3] = fw_arg3;
++ int i;
+
+ pr_info("kexec_args[0] (argc): %lu\n", kexec_args[0]);
+ pr_info("kexec_args[1] (argv): %p\n", (void *)kexec_args[1]);
+ pr_info("kexec_args[2] (env ): %p\n", (void *)kexec_args[2]);
+ pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
+-}
+
+-#define ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
++ for (i = 0; i < kexec_args[0]; i++)
++ pr_info("kexec_argv[%d] = %p, %s\n", i,
++ (char *)kexec_argv[i], (char *)kexec_argv[i]);
++}
+
+-int machine_kexec_pass_args(struct kimage *image)
++static void
++machine_kexec_init_argv(struct kimage *image)
+ {
+- int i, argc = 0;
+- char *bootloader = "kexec";
+- int *kexec_argv = (int *)kexec_args[1];
++ void __user *buf;
++ size_t bufsz;
++ size_t size;
++ int i;
+
++ bufsz = 0;
+ for (i = 0; i < image->nr_segments; i++) {
+- if (!strncmp(bootloader, (char *)image->segment[i].buf,
+- strlen(bootloader))) {
+- /*
+- * convert command line string to array
+- * of parameters (as bootloader does).
+- */
+- /*
+- * Note: we do treat the 1st string "kexec" as an
+- * argument ;-) so, argc here is 1.
+- */
+- char *str = (char *)image->segment[i].buf;
+- char *ptr = strchr(str, ' ');
+- char *kbuf = (char *)kexec_argv[0];
+- /* Whenever --command-line or --append used, "kexec" is copied */
+- argc = 1;
+- /* Parse the offset */
+- while (ptr && (ARGV_MAX_ARGS > argc)) {
+- *ptr = '\0';
+- if (ptr[1] != ' ' && ptr[1] != '\0') {
+- int offt = (int)(ptr - str + 1);
+- kexec_argv[argc] = (int)kbuf + offt;
+- argc++;
+- }
+- ptr = strchr(ptr + 1, ' ');
+- }
+- if (argc > 1) {
+- /* Copy to kernel space */
+- copy_from_user(kbuf, (char *)image->segment[i].buf, image->segment[i].bufsz);
+- fw_arg0 = kexec_args[0] = argc;
+- }
+- break;
++ struct kexec_segment *seg;
++
++ seg = &image->segment[i];
++ if (seg->bufsz < 6)
++ continue;
++
++ if (strncmp((char *) seg->buf, "kexec", 5))
++ continue;
++
++ /* don't copy "kexec" */
++ buf = seg->buf + 5;
++ bufsz = seg->bufsz - 5;
++ break;
++ }
++
++ if (i >= image->nr_segments)
++ return;
++
++ size = KEXEC_MIPS_ARGV_BUF_SIZE - 1;
++ size = min(size, bufsz);
++ if (size < bufsz)
++ pr_warn("kexec command line truncated to %d bytes\n", size);
++
++ /* Copy to kernel space */
++ copy_from_user(kexec_argv_buf, buf, size);
++}
++
++static void
++machine_kexec_parse_argv(struct kimage *image)
++{
++ char *reboot_code_buffer;
++ int reloc_delta;
++ char *ptr;
++ int argc;
++ int i;
++
++ ptr = kexec_argv_buf;
++ argc = 0;
++
++ /*
++ * convert command line string to array of parameters
++ * (as bootloader does).
++ */
++ while (ptr && *ptr && (KEXEC_MIPS_ARGV_MAX_ARGS > argc)) {
++ if (*ptr == ' ') {
++ *ptr++ = '\0';
++ continue;
+ }
++
++ kexec_argv[argc++] = (int) ptr;
++ ptr = strchr(ptr, ' ');
+ }
+
+- pr_info("argc = %lu\n", kexec_args[0]);
+- for (i = 0; i < kexec_args[0]; i++)
+- pr_info("argv[%d] = %p, %s\n", i, (char *)kexec_argv[i], (char *)kexec_argv[i]);
++ if (!argc)
++ return;
+
+- return 0;
++ kexec_args[0] = argc;
++ kexec_args[1] = (int) kexec_argv;
++ kexec_args[2] = 0;
++ kexec_args[3] = 0;
++
++ reboot_code_buffer = page_address(image->control_code_page);
++ reloc_delta = reboot_code_buffer - (char *) &__start___kexec_relocate;
++
++ kexec_args[1] += reloc_delta;
++ for (i = 0; i < argc; i++)
++ kexec_argv[i] += reloc_delta;
+ }
+
+ int
+@@ -95,8 +132,14 @@ machine_kexec_prepare(struct kimage *kim
+ *
+ * This can be overrided by _machine_kexec_prepare().
+ */
+- machine_kexec_init_args();
+- machine_kexec_pass_args(kimage);
++
++ kexec_args[0] = fw_arg0;
++ kexec_args[1] = fw_arg1;
++ kexec_args[2] = fw_arg2;
++ kexec_args[3] = fw_arg3;
++
++ machine_kexec_init_argv(kimage);
++ machine_kexec_parse_argv(kimage);
+
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
+@@ -152,11 +195,13 @@ machine_kexec(struct kimage *image)
+ pr_info("kexec_indirection_page = %p\n",
+ (void *)kexec_indirection_page);
+
++ pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
++ &__start___kexec_relocate, (void *)reboot_code_buffer);
++
+ memcpy((void *)reboot_code_buffer, &__start___kexec_relocate,
+ kexec_relocate_size);
+
+- pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
+- &__start___kexec_relocate, (void *)reboot_code_buffer);
++ machine_kexec_print_args();
+
+ /*
+ * The generic kexec code builds a page list with physical
--- /dev/null
+From eee16330c9de9adf7880cce9f1d32e13f89706bb Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Tue, 11 Jan 2011 13:16:47 +0000
+Subject: MIPS: Add crash and kdump support
+
+From: http://patchwork.linux-mips.org/patch/1025/
+
+Hello folks,
+
+Please find here MIPS crash and kdump patches.
+This is patch set of 3 patches:
+1. generic MIPS changes (kernel);
+2. MIPS Cavium Octeon board kexec/kdump code (kernel);
+3. Kexec user space MIPS changes.
+
+Patches were tested on the latest linux-mips@ git kernel and the latest
+kexec-tools git on Cavium Octeon 50xx board.
+
+I also made the same code working on RMI XLR/XLS boards for both
+mips32 and mips64 kernels.
+
+Best regards,
+Maxim Uvarov.
+
+------
+[ Zhangjin: Several trivial building failure has been fixed.
+
+Note: the 2nd patch can not be cleanly applied, but may be a good
+reference for the other board development:
+
+ + MIPS Cavium Octeon board kexec,kdump support
+ http://patchwork.linux-mips.org/patch/1026/
+
+And the 3rd patch has already been merged into the mainline kexec-tools:
+
+ + some kexec MIPS improvements
+ http://patchwork.linux-mips.org/patch/1027/
+
+kexec-tools is available here:
+
+ + http://horms.net/projects/kexec/
+ git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
+]
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+(limited to 'arch/mips/kernel')
+
+--- a/arch/mips/kernel/Makefile
++++ b/arch/mips/kernel/Makefile
+@@ -93,7 +93,8 @@ obj-$(CONFIG_I8253) += i8253.o
+
+ obj-$(CONFIG_GPIO_TXX9) += gpio_txx9.o
+
+-obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
++obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o crash.o
++obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
+ obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+ obj-$(CONFIG_SPINLOCK_TEST) += spinlock_test.o
+ obj-$(CONFIG_MIPS_MACHINE) += mips_machine.o
+--- /dev/null
++++ b/arch/mips/kernel/crash.c
+@@ -0,0 +1,75 @@
++#include <linux/kernel.h>
++#include <linux/smp.h>
++#include <linux/reboot.h>
++#include <linux/kexec.h>
++#include <linux/bootmem.h>
++#include <linux/crash_dump.h>
++#include <linux/delay.h>
++#include <linux/init.h>
++#include <linux/irq.h>
++#include <linux/types.h>
++#include <linux/sched.h>
++
++#ifdef CONFIG_CRASH_DUMP
++unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
++#endif
++
++/* This keeps a track of which one is crashing cpu. */
++int crashing_cpu = -1;
++static cpumask_t cpus_in_crash = CPU_MASK_NONE;
++
++#ifdef CONFIG_SMP
++void crash_shutdown_secondary(void *ignore)
++{
++ struct pt_regs *regs;
++ int cpu = smp_processor_id();
++
++ regs = task_pt_regs(current);
++
++ if (!cpu_online(cpu))
++ return;
++
++ local_irq_disable();
++ if (!cpu_isset(cpu, cpus_in_crash))
++ crash_save_cpu(regs, cpu);
++ cpu_set(cpu, cpus_in_crash);
++
++ while (!atomic_read(&kexec_ready_to_reboot))
++ cpu_relax();
++ relocated_kexec_smp_wait(NULL);
++ /* NOTREACHED */
++}
++
++static void crash_kexec_prepare_cpus(void)
++{
++ unsigned int msecs;
++
++ unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
++
++ dump_send_ipi(crash_shutdown_secondary);
++ smp_wmb();
++
++ /*
++ * The crash CPU sends an IPI and wait for other CPUs to
++ * respond. Delay of at least 10 seconds.
++ */
++ printk(KERN_EMERG "Sending IPI to other cpus...\n");
++ msecs = 10000;
++ while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
++ cpu_relax();
++ mdelay(1);
++ }
++}
++
++#else
++static void crash_kexec_prepare_cpus(void) {}
++#endif
++
++void default_machine_crash_shutdown(struct pt_regs *regs)
++{
++ local_irq_disable();
++ crashing_cpu = smp_processor_id();
++ crash_save_cpu(regs, crashing_cpu);
++ crash_kexec_prepare_cpus();
++ cpu_set(crashing_cpu, cpus_in_crash);
++}
+--- /dev/null
++++ b/arch/mips/kernel/crash_dump.c
+@@ -0,0 +1,86 @@
++#include <linux/highmem.h>
++#include <linux/bootmem.h>
++#include <linux/crash_dump.h>
++#include <asm/uaccess.h>
++
++#ifdef CONFIG_PROC_VMCORE
++static int __init parse_elfcorehdr(char *p)
++{
++ if (p)
++ elfcorehdr_addr = memparse(p, &p);
++ return 1;
++}
++__setup("elfcorehdr=", parse_elfcorehdr);
++#endif
++
++static int __init parse_savemaxmem(char *p)
++{
++ if (p)
++ saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1;
++
++ return 1;
++}
++__setup("savemaxmem=", parse_savemaxmem);
++
++
++static void *kdump_buf_page;
++
++/**
++ * copy_oldmem_page - copy one page from "oldmem"
++ * @pfn: page frame number to be copied
++ * @buf: target memory address for the copy; this can be in kernel address
++ * space or user address space (see @userbuf)
++ * @csize: number of bytes to copy
++ * @offset: offset in bytes into the page (based on pfn) to begin the copy
++ * @userbuf: if set, @buf is in user address space, use copy_to_user(),
++ * otherwise @buf is in kernel address space, use memcpy().
++ *
++ * Copy a page from "oldmem". For this page, there is no pte mapped
++ * in the current kernel.
++ *
++ * Calling copy_to_user() in atomic context is not desirable. Hence first
++ * copying the data to a pre-allocated kernel page and then copying to user
++ * space in non-atomic context.
++ */
++ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
++ size_t csize, unsigned long offset, int userbuf)
++{
++ void *vaddr;
++
++ if (!csize)
++ return 0;
++
++ vaddr = kmap_atomic_pfn(pfn, KM_PTE0);
++
++ if (!userbuf) {
++ memcpy(buf, (vaddr + offset), csize);
++ kunmap_atomic(vaddr, KM_PTE0);
++ } else {
++ if (!kdump_buf_page) {
++ printk(KERN_WARNING "Kdump: Kdump buffer page not"
++ " allocated\n");
++ return -EFAULT;
++ }
++ copy_page(kdump_buf_page, vaddr);
++ kunmap_atomic(vaddr, KM_PTE0);
++ if (copy_to_user(buf, (kdump_buf_page + offset), csize))
++ return -EFAULT;
++ }
++
++ return csize;
++}
++
++static int __init kdump_buf_page_init(void)
++{
++ int ret = 0;
++
++ kdump_buf_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
++ if (!kdump_buf_page) {
++ printk(KERN_WARNING "Kdump: Failed to allocate kdump buffer"
++ " page\n");
++ ret = -ENOMEM;
++ }
++
++ return ret;
++}
++arch_initcall(kdump_buf_page_init);
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -19,9 +19,19 @@ extern const size_t relocate_new_kernel_
+ extern unsigned long kexec_start_address;
+ extern unsigned long kexec_indirection_page;
+
++int (*_machine_kexec_prepare)(struct kimage *) = NULL;
++void (*_machine_kexec_shutdown)(void) = NULL;
++void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
++#ifdef CONFIG_SMP
++void (*relocated_kexec_smp_wait) (void *);
++atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
++#endif
++
+ int
+ machine_kexec_prepare(struct kimage *kimage)
+ {
++ if (_machine_kexec_prepare)
++ return _machine_kexec_prepare(kimage);
+ return 0;
+ }
+
+@@ -33,11 +43,17 @@ machine_kexec_cleanup(struct kimage *kim
+ void
+ machine_shutdown(void)
+ {
++ if (_machine_kexec_shutdown)
++ _machine_kexec_shutdown();
+ }
+
+ void
+ machine_crash_shutdown(struct pt_regs *regs)
+ {
++ if (_machine_crash_shutdown)
++ _machine_crash_shutdown(regs);
++ else
++ default_machine_crash_shutdown(regs);
+ }
+
+ typedef void (*noretfun_t)(void) __attribute__((noreturn));
+@@ -52,7 +68,9 @@ machine_kexec(struct kimage *image)
+ reboot_code_buffer =
+ (unsigned long)page_address(image->control_code_page);
+
+- kexec_start_address = (unsigned long) phys_to_virt(image->start);
++ kexec_start_address =
++ (unsigned long) phys_to_virt(image->start);
++
+ kexec_indirection_page =
+ (unsigned long) phys_to_virt(image->head & PAGE_MASK);
+
+@@ -63,7 +81,7 @@ machine_kexec(struct kimage *image)
+ * The generic kexec code builds a page list with physical
+ * addresses. they are directly accessible through KSEG0 (or
+ * CKSEG0 or XPHYS if on 64bit system), hence the
+- * pys_to_virt() call.
++ * phys_to_virt() call.
+ */
+ for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
+ ptr = (entry & IND_INDIRECTION) ?
+@@ -81,5 +99,13 @@ machine_kexec(struct kimage *image)
+ printk("Will call new kernel at %08lx\n", image->start);
+ printk("Bye ...\n");
+ __flush_cache_all();
++#ifdef CONFIG_SMP
++ /* All secondary cpus now may jump to kexec_wait cycle */
++ relocated_kexec_smp_wait = reboot_code_buffer +
++ (void *)(kexec_smp_wait - relocate_new_kernel);
++ smp_wmb();
++ atomic_set(&kexec_ready_to_reboot, 1);
++#endif
+ ((noretfun_t) reboot_code_buffer)();
+ }
++
+--- a/arch/mips/kernel/relocate_kernel.S
++++ b/arch/mips/kernel/relocate_kernel.S
+@@ -15,6 +15,11 @@
+ #include <asm/addrspace.h>
+
+ LEAF(relocate_new_kernel)
++ PTR_L a0, arg0
++ PTR_L a1, arg1
++ PTR_L a2, arg2
++ PTR_L a3, arg3
++
+ PTR_L s0, kexec_indirection_page
+ PTR_L s1, kexec_start_address
+
+@@ -26,7 +31,6 @@ process_entry:
+ and s3, s2, 0x1
+ beq s3, zero, 1f
+ and s4, s2, ~0x1 /* store destination addr in s4 */
+- move a0, s4
+ b process_entry
+
+ 1:
+@@ -60,23 +64,100 @@ copy_word:
+ b process_entry
+
+ done:
++#ifdef CONFIG_SMP
++ /* kexec_flag reset is signal to other CPUs what kernel
++ was moved to it's location. Note - we need relocated address
++ of kexec_flag. */
++
++ bal 1f
++ 1: move t1,ra;
++ PTR_LA t2,1b
++ PTR_LA t0,kexec_flag
++ PTR_SUB t0,t0,t2;
++ PTR_ADD t0,t1,t0;
++ LONG_S zero,(t0)
++#endif
++
++ sync
+ /* jump to kexec_start_address */
+ j s1
+ END(relocate_new_kernel)
+
+-kexec_start_address:
+- EXPORT(kexec_start_address)
++#ifdef CONFIG_SMP
++/*
++ * Other CPUs should wait until code is relocated and
++ * then start at entry (?) point.
++ */
++LEAF(kexec_smp_wait)
++ PTR_L a0, s_arg0
++ PTR_L a1, s_arg1
++ PTR_L a2, s_arg2
++ PTR_L a3, s_arg3
++ PTR_L s1, kexec_start_address
++
++ /* Non-relocated address works for args and kexec_start_address ( old
++ * kernel is not overwritten). But we need relocated address of
++ * kexec_flag.
++ */
++
++ bal 1f
++1: move t1,ra;
++ PTR_LA t2,1b
++ PTR_LA t0,kexec_flag
++ PTR_SUB t0,t0,t2;
++ PTR_ADD t0,t1,t0;
++
++1: LONG_L s0, (t0)
++ bne s0, zero,1b
++
++ sync
++ j s1
++ END(kexec_smp_wait)
++#endif
++
++#ifdef __mips64
++ /* all PTR's must be aligned to 8 byte in 64-bit mode */
++ .align 3
++#endif
++
++/* All parameters to new kernel are passed in registers a0-a3.
++ * kexec_args[0..3] are uses to prepare register values.
++ */
++
++EXPORT(kexec_args)
++arg0: PTR 0x0
++arg1: PTR 0x0
++arg2: PTR 0x0
++arg3: PTR 0x0
++ .size kexec_args,PTRSIZE*4
++
++#ifdef CONFIG_SMP
++/*
++ * Secondary CPUs may have different kernel parameters in
++ * their registers a0-a3. secondary_kexec_args[0..3] are used
++ * to prepare register values.
++ */
++EXPORT(secondary_kexec_args)
++s_arg0: PTR 0x0
++s_arg1: PTR 0x0
++s_arg2: PTR 0x0
++s_arg3: PTR 0x0
++ .size secondary_kexec_args,PTRSIZE*4
++kexec_flag:
++ LONG 0x1
++
++#endif
++
++EXPORT(kexec_start_address)
+ PTR 0x0
+ .size kexec_start_address, PTRSIZE
+
+-kexec_indirection_page:
+- EXPORT(kexec_indirection_page)
++EXPORT(kexec_indirection_page)
+ PTR 0
+ .size kexec_indirection_page, PTRSIZE
+
+ relocate_new_kernel_end:
+
+-relocate_new_kernel_size:
+- EXPORT(relocate_new_kernel_size)
++EXPORT(relocate_new_kernel_size)
+ PTR relocate_new_kernel_end - relocate_new_kernel
+ .size relocate_new_kernel_size, PTRSIZE
+--- a/arch/mips/kernel/setup.c
++++ b/arch/mips/kernel/setup.c
+@@ -21,6 +21,7 @@
+ #include <linux/console.h>
+ #include <linux/pfn.h>
+ #include <linux/debugfs.h>
++#include <linux/kexec.h>
+
+ #include <asm/addrspace.h>
+ #include <asm/bootinfo.h>
+@@ -488,12 +489,62 @@ static void __init arch_mem_init(char **
+ }
+
+ bootmem_init();
++#ifdef CONFIG_KEXEC
++ if (crashk_res.start != crashk_res.end)
++ reserve_bootmem(crashk_res.start,
++ crashk_res.end - crashk_res.start + 1,
++ BOOTMEM_DEFAULT);
++#endif
+ device_tree_init();
+ sparse_init();
+ plat_swiotlb_setup();
+ paging_init();
+ }
+
++#ifdef CONFIG_KEXEC
++static inline unsigned long long get_total_mem(void)
++{
++ unsigned long long total;
++ total = max_pfn - min_low_pfn;
++ return total << PAGE_SHIFT;
++}
++
++static void __init mips_parse_crashkernel(void)
++{
++ unsigned long long total_mem;
++ unsigned long long crash_size, crash_base;
++ int ret;
++
++ total_mem = get_total_mem();
++ ret = parse_crashkernel(boot_command_line, total_mem,
++ &crash_size, &crash_base);
++ if (ret != 0 || crash_size <= 0)
++ return;
++
++ crashk_res.start = crash_base;
++ crashk_res.end = crash_base + crash_size - 1;
++}
++static void __init request_crashkernel(struct resource *res)
++{
++ int ret;
++
++ ret = request_resource(res, &crashk_res);
++ if (!ret)
++ printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
++ "for crashkernel\n",
++ (unsigned long)((crashk_res.end -
++ crashk_res.start + 1) >> 20),
++ (unsigned long)(crashk_res.start >> 20));
++}
++#else
++static void __init mips_parse_crashkernel(void)
++{
++}
++static void __init request_crashkernel(struct resource *res)
++{
++}
++#endif
++
+ static void __init resource_init(void)
+ {
+ int i;
+@@ -509,6 +560,8 @@ static void __init resource_init(void)
+ /*
+ * Request address space for all standard RAM.
+ */
++ mips_parse_crashkernel();
++
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ struct resource *res;
+ unsigned long start, end;
+@@ -544,6 +597,7 @@ static void __init resource_init(void)
+ */
+ request_resource(res, &code_resource);
+ request_resource(res, &data_resource);
++ request_crashkernel(res);
+ }
+ }
+
+--- a/arch/mips/kernel/smp.c
++++ b/arch/mips/kernel/smp.c
+@@ -433,3 +433,21 @@ void flush_tlb_one(unsigned long vaddr)
+
+ EXPORT_SYMBOL(flush_tlb_page);
+ EXPORT_SYMBOL(flush_tlb_one);
++
++#if defined(CONFIG_KEXEC)
++void (*dump_ipi_function_ptr)(void *) = NULL;
++void dump_send_ipi(void (*dump_ipi_callback)(void *))
++{
++ int i;
++ int cpu = smp_processor_id();
++
++ dump_ipi_function_ptr = dump_ipi_callback;
++ smp_mb();
++ for_each_online_cpu(i)
++ if (i != cpu)
++ core_send_ipi(i, SMP_DUMP);
++
++}
++EXPORT_SYMBOL(dump_send_ipi);
++#endif
++
+--- a/arch/mips/include/asm/kexec.h
++++ b/arch/mips/include/asm/kexec.h
+@@ -9,22 +9,45 @@
+ #ifndef _MIPS_KEXEC
+ # define _MIPS_KEXEC
+
++#include <asm/stacktrace.h>
++
++extern unsigned long long elfcorehdr_addr;
++
+ /* Maximum physical address we can use pages from */
+ #define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000)
+ /* Maximum address we can reach in physical address mode */
+ #define KEXEC_DESTINATION_MEMORY_LIMIT (0x20000000)
+ /* Maximum address we can use for the control code buffer */
+ #define KEXEC_CONTROL_MEMORY_LIMIT (0x20000000)
+-
+-#define KEXEC_CONTROL_PAGE_SIZE 4096
++/* Reserve 3*4096 bytes for board-specific info */
++#define KEXEC_CONTROL_PAGE_SIZE (4096 + 3*4096)
+
+ /* The native architecture */
+ #define KEXEC_ARCH KEXEC_ARCH_MIPS
++#define MAX_NOTE_BYTES 1024
+
+ static inline void crash_setup_regs(struct pt_regs *newregs,
+- struct pt_regs *oldregs)
++ struct pt_regs *oldregs)
+ {
+- /* Dummy implementation for now */
++ if (oldregs)
++ memcpy(newregs, oldregs, sizeof(*newregs));
++ else
++ prepare_frametrace(newregs);
+ }
+
++#ifdef CONFIG_KEXEC
++struct kimage;
++extern unsigned long kexec_args[4];
++extern int (*_machine_kexec_prepare)(struct kimage *);
++extern void (*_machine_kexec_shutdown)(void);
++extern void (*_machine_crash_shutdown)(struct pt_regs *regs);
++extern void default_machine_crash_shutdown(struct pt_regs *regs);
++#ifdef CONFIG_SMP
++extern const unsigned char kexec_smp_wait[];
++extern unsigned long secondary_kexec_args[4];
++extern void (*relocated_kexec_smp_wait) (void *);
++extern atomic_t kexec_ready_to_reboot;
++#endif
++#endif
++
+ #endif /* !_MIPS_KEXEC */
+--- a/arch/mips/include/asm/smp.h
++++ b/arch/mips/include/asm/smp.h
+@@ -40,6 +40,8 @@ extern int __cpu_logical_map[NR_CPUS];
+ #define SMP_CALL_FUNCTION 0x2
+ /* Octeon - Tell another core to flush its icache */
+ #define SMP_ICACHE_FLUSH 0x4
++/* Used by kexec crashdump to save all cpu's state */
++#define SMP_DUMP 0x8
+
+ extern volatile cpumask_t cpu_callin_map;
+
+@@ -91,4 +93,9 @@ static inline void arch_send_call_functi
+ mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
+ }
+
++extern void core_send_ipi(int cpu, unsigned int action);
++#if defined(CONFIG_KEXEC)
++extern void (*dump_ipi_function_ptr)(void *);
++void dump_send_ipi(void (*dump_ipi_callback)(void *));
++#endif
+ #endif /* __ASM_SMP_H */
--- /dev/null
+From 03cd81fbca6b91317ec1a7b3b3c09fb8d08f83a6 Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Tue, 11 Jan 2011 18:42:08 +0000
+Subject: MIPS: Kexec: Enhance the support
+
+Changes:
+ o Print more information in machine_kexec() for debugging
+ E.g. with this information, the kexec_start_address has been found
+ it was wrong with 64bit kernel / o32 kexec-tools. Which must be
+ fixed later.
+ o Link relocate_kernel.S to a section for future extension
+ This allows more functions can be added for the kexec relocation
+ part even written in C. to add code into that section, you just need
+ to mark your function or data with __kexec or
+ __attribute__((__section__(".__kexec.relocate")))
+
+TODO:
+
+1. Make 64bit kernel / o32|n32|64 kexec-tools works
+
+Fix the user-space kexec-tools, seems the tool only work for 32bit
+machine. So, we need to add 64bit support for it. The address of the
+entry point(kexec_start_address) is wrong and make the "kexec -e" fail.
+the real entry point must be read from the new kernel image by the
+user-space kexec-tools, otherwise, it will not work. The above 64bit
+support tested is 64bit kernel with o32 user-space kexec-tools. The root
+cause may be the different definition of virt_to_phys() and
+phys_to_virt() in the kexec-tools and kernel space for 64bit system /
+o32 kernel.
+
+Ref: http://www.linux-mips.org/archives/linux-mips/2009-08/msg00149.html
+
+2. Pass the arguments from kexec-tools to the new kernel image
+
+Please refer to: "MIPS: Loongson: Kexec: Pass parameters to new kernel"
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+--- a/arch/mips/include/asm/kexec.h
++++ b/arch/mips/include/asm/kexec.h
+@@ -36,6 +36,16 @@ static inline void crash_setup_regs(stru
+ }
+
+ #ifdef CONFIG_KEXEC
++
++#define __kexec __attribute__((__section__(".__kexec.relocate")))
++
++/* The linker tells us where the relocate_new_kernel part is. */
++extern const unsigned char __start___kexec_relocate;
++extern const unsigned char __end___kexec_relocate;
++
++extern unsigned long kexec_start_address;
++extern unsigned long kexec_indirection_page;
++
+ struct kimage;
+ extern unsigned long kexec_args[4];
+ extern int (*_machine_kexec_prepare)(struct kimage *);
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -13,12 +13,6 @@
+ #include <asm/cacheflush.h>
+ #include <asm/page.h>
+
+-extern const unsigned char relocate_new_kernel[];
+-extern const size_t relocate_new_kernel_size;
+-
+-extern unsigned long kexec_start_address;
+-extern unsigned long kexec_indirection_page;
+-
+ int (*_machine_kexec_prepare)(struct kimage *) = NULL;
+ void (*_machine_kexec_shutdown)(void) = NULL;
+ void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
+@@ -61,21 +55,34 @@ typedef void (*noretfun_t)(void) __attri
+ void
+ machine_kexec(struct kimage *image)
+ {
++ unsigned long kexec_relocate_size;
+ unsigned long reboot_code_buffer;
+ unsigned long entry;
+ unsigned long *ptr;
+
++ kexec_relocate_size = (unsigned long)(&__end___kexec_relocate) -
++ (unsigned long)(&__start___kexec_relocate);
++ pr_info("kexec_relocate_size = %lu\n", kexec_relocate_size);
++
+ reboot_code_buffer =
+ (unsigned long)page_address(image->control_code_page);
++ pr_info("reboot_code_buffer = %p\n", (void *)reboot_code_buffer);
+
+ kexec_start_address =
+ (unsigned long) phys_to_virt(image->start);
++ pr_info("kexec_start_address(entry point of new kernel) = %p\n",
++ (void *)kexec_start_address);
+
+ kexec_indirection_page =
+ (unsigned long) phys_to_virt(image->head & PAGE_MASK);
++ pr_info("kexec_indirection_page = %p\n",
++ (void *)kexec_indirection_page);
+
+- memcpy((void*)reboot_code_buffer, relocate_new_kernel,
+- relocate_new_kernel_size);
++ memcpy((void *)reboot_code_buffer, &__start___kexec_relocate,
++ kexec_relocate_size);
++
++ pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
++ &__start___kexec_relocate, (void *)reboot_code_buffer);
+
+ /*
+ * The generic kexec code builds a page list with physical
+@@ -96,8 +103,8 @@ machine_kexec(struct kimage *image)
+ */
+ local_irq_disable();
+
+- printk("Will call new kernel at %08lx\n", image->start);
+- printk("Bye ...\n");
++ pr_info("Will call new kernel at %p\n", (void *)kexec_start_address);
++ pr_info("Bye ...\n");
+ __flush_cache_all();
+ #ifdef CONFIG_SMP
+ /* All secondary cpus now may jump to kexec_wait cycle */
+@@ -108,4 +115,3 @@ machine_kexec(struct kimage *image)
+ #endif
+ ((noretfun_t) reboot_code_buffer)();
+ }
+-
+--- a/arch/mips/kernel/relocate_kernel.S
++++ b/arch/mips/kernel/relocate_kernel.S
+@@ -14,6 +14,8 @@
+ #include <asm/stackframe.h>
+ #include <asm/addrspace.h>
+
++ .section .kexec.relocate, "ax"
++
+ LEAF(relocate_new_kernel)
+ PTR_L a0, arg0
+ PTR_L a1, arg1
+@@ -155,9 +157,3 @@ EXPORT(kexec_start_address)
+ EXPORT(kexec_indirection_page)
+ PTR 0
+ .size kexec_indirection_page, PTRSIZE
+-
+-relocate_new_kernel_end:
+-
+-EXPORT(relocate_new_kernel_size)
+- PTR relocate_new_kernel_end - relocate_new_kernel
+- .size relocate_new_kernel_size, PTRSIZE
+--- a/arch/mips/kernel/vmlinux.lds.S
++++ b/arch/mips/kernel/vmlinux.lds.S
+@@ -50,6 +50,10 @@ SECTIONS
+ *(.text.*)
+ *(.fixup)
+ *(.gnu.warning)
++ __start___kexec_relocate = .;
++ KEEP(*(.kexec.relocate))
++ KEEP(*(.__kexec.relocate))
++ __end___kexec_relocate = .;
+ } :text = 0
+ _etext = .; /* End of text section */
+
--- /dev/null
+From 49d07a29653b1f2c6ae273b3d8fe93d981f43004 Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Wed, 12 Jan 2011 20:59:32 +0000
+Subject: MIPS: Kexec: Init the arguments for the new kernel image
+
+Whenever the kexec-tools pass the command lines to the new kernel image,
+init the arguments as the ones for the 1st kernel image. This fixed the
+booting failure of Kexec on YeeLoong.
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -10,6 +10,7 @@
+ #include <linux/mm.h>
+ #include <linux/delay.h>
+
++#include <asm/bootinfo.h>
+ #include <asm/cacheflush.h>
+ #include <asm/page.h>
+
+@@ -21,9 +22,30 @@ void (*relocated_kexec_smp_wait) (void *
+ atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
+ #endif
+
++static void machine_kexec_init_args(void)
++{
++ kexec_args[0] = fw_arg0;
++ kexec_args[1] = fw_arg1;
++ kexec_args[2] = fw_arg2;
++ kexec_args[3] = fw_arg3;
++
++ pr_info("kexec_args[0] (argc): %lu\n", kexec_args[0]);
++ pr_info("kexec_args[1] (argv): %p\n", (void *)kexec_args[1]);
++ pr_info("kexec_args[2] (env ): %p\n", (void *)kexec_args[2]);
++ pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
++}
++
+ int
+ machine_kexec_prepare(struct kimage *kimage)
+ {
++ /*
++ * Whenever arguments passed from kexec-tools, Init the arguments as
++ * the original ones to avoid booting failure.
++ *
++ * This can be overrided by _machine_kexec_prepare().
++ */
++ machine_kexec_init_args();
++
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
+ return 0;
--- /dev/null
+From 240c76841b26f1b09aaced33414ee1d08b6454cf Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Sat, 15 Jan 2011 12:46:03 +0000
+Subject: MIPS: Get kernel parameters from kexec-tools
+
+Before, we simply use the command lines from the original bootloader,
+but it is not convenient. Now, we accept the kernel parameters from the
+--command-line or --append option of the kexec-tools. But If not
+--command-line or --apend option indicated, will fall back to use the
+ones from the original bootloader.
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -13,6 +13,7 @@
+ #include <asm/bootinfo.h>
+ #include <asm/cacheflush.h>
+ #include <asm/page.h>
++#include <asm/uaccess.h>
+
+ int (*_machine_kexec_prepare)(struct kimage *) = NULL;
+ void (*_machine_kexec_shutdown)(void) = NULL;
+@@ -35,6 +36,56 @@ static void machine_kexec_init_args(void
+ pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
+ }
+
++#define ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
++
++int machine_kexec_pass_args(struct kimage *image)
++{
++ int i, argc = 0;
++ char *bootloader = "kexec";
++ int *kexec_argv = (int *)kexec_args[1];
++
++ for (i = 0; i < image->nr_segments; i++) {
++ if (!strncmp(bootloader, (char *)image->segment[i].buf,
++ strlen(bootloader))) {
++ /*
++ * convert command line string to array
++ * of parameters (as bootloader does).
++ */
++ /*
++ * Note: we do treat the 1st string "kexec" as an
++ * argument ;-) so, argc here is 1.
++ */
++ char *str = (char *)image->segment[i].buf;
++ char *ptr = strchr(str, ' ');
++ char *kbuf = (char *)kexec_argv[0];
++ /* Whenever --command-line or --append used, "kexec" is copied */
++ argc = 1;
++ /* Parse the offset */
++ while (ptr && (ARGV_MAX_ARGS > argc)) {
++ *ptr = '\0';
++ if (ptr[1] != ' ' && ptr[1] != '\0') {
++ int offt = (int)(ptr - str + 1);
++ kexec_argv[argc] = (int)kbuf + offt;
++ argc++;
++ }
++ ptr = strchr(ptr + 1, ' ');
++ }
++ if (argc > 1) {
++ /* Copy to kernel space */
++ copy_from_user(kbuf, (char *)image->segment[i].buf, image->segment[i].bufsz);
++ fw_arg0 = kexec_args[0] = argc;
++ }
++ break;
++ }
++ }
++
++ pr_info("argc = %lu\n", kexec_args[0]);
++ for (i = 0; i < kexec_args[0]; i++)
++ pr_info("argv[%d] = %p, %s\n", i, (char *)kexec_argv[i], (char *)kexec_argv[i]);
++
++ return 0;
++}
++
+ int
+ machine_kexec_prepare(struct kimage *kimage)
+ {
+@@ -45,6 +96,7 @@ machine_kexec_prepare(struct kimage *kim
+ * This can be overrided by _machine_kexec_prepare().
+ */
+ machine_kexec_init_args();
++ machine_kexec_pass_args(kimage);
+
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
--- /dev/null
+From 4aded085fa0057a9a1e1dcec631f950307360c1f Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Tue, 11 Jan 2011 13:46:19 +0000
+Subject: MIPS: Fix compiling failure of relocate_kernel.S
+
+The following errors is fixed with the help of <asm/asm_nosec.h>. for
+this file need to put different symbols in the same section, the
+original LEAF, NESTED and EXPORT (without explicit section indication)
+must be used, <asm/asm_nosec.h> does it.
+
+arch/mips/kernel/relocate_kernel.S: Assembler messages:
+arch/mips/kernel/relocate_kernel.S:162: Error: operation combines symbols in different segments
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+(limited to 'arch/mips/kernel')
+
+--- a/arch/mips/kernel/relocate_kernel.S
++++ b/arch/mips/kernel/relocate_kernel.S
+@@ -7,6 +7,7 @@
+ */
+
+ #include <asm/asm.h>
++#include <asm/asm_nosec.h>
+ #include <asm/asmmacro.h>
+ #include <asm/regdef.h>
+ #include <asm/page.h>
+--- /dev/null
++++ b/arch/mips/include/asm/asm_nosec.h
+@@ -0,0 +1,53 @@
++/*
++ * This file is subject to the terms and conditions of the GNU General Public
++ * License. See the file "COPYING" in the main directory of this archive
++ * for more details.
++ *
++ * Copyright (C) 1995, 1996, 1997, 1999, 2001 by Ralf Baechle
++ * Copyright (C) 1999 by Silicon Graphics, Inc.
++ * Copyright (C) 2001 MIPS Technologies, Inc.
++ * Copyright (C) 2002 Maciej W. Rozycki
++ * Copyright (C) 2010 Wu Zhangjin <wuzhangjin@gmail.com>
++ *
++ * Derive from <asm/asm.h>
++ *
++ * Override the macros without -ffunction-sections and -fdata-sections support.
++ * If several functions or data must be put in the same section, please include
++ * this header file after the <asm/asm.h> to override the generic definition.
++ */
++
++#ifndef __ASM_ASM_NOSEC_H
++#define __ASM_ASM_NOSEC_H
++
++#undef LEAF
++#undef NESTED
++#undef EXPORT
++
++/*
++ * LEAF - declare leaf routine
++ */
++#define LEAF(symbol) \
++ .globl symbol; \
++ .align 2; \
++ .type symbol, @function; \
++ .ent symbol, 0; \
++symbol: .frame sp, 0, ra
++
++/*
++ * NESTED - declare nested routine entry point
++ */
++#define NESTED(symbol, framesize, rpc) \
++ .globl symbol; \
++ .align 2; \
++ .type symbol, @function; \
++ .ent symbol, 0; \
++symbol: .frame sp, framesize, rpc
++
++/*
++ * EXPORT - export definition of symbol
++ */
++#define EXPORT(symbol) \
++ .globl symbol; \
++symbol:
++
++#endif /* __ASM_ASM_NOSEC_H */
--- /dev/null
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -23,67 +23,104 @@ void (*relocated_kexec_smp_wait) (void *
+ atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
+ #endif
+
+-static void machine_kexec_init_args(void)
++#define KEXEC_MIPS_ARGV_BUF_SIZE COMMAND_LINE_SIZE
++#define KEXEC_MIPS_ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
++
++char kexec_argv_buf[KEXEC_MIPS_ARGV_BUF_SIZE] __kexec;
++int kexec_argv[KEXEC_MIPS_ARGV_MAX_ARGS] __kexec;
++
++static void
++machine_kexec_print_args(void)
+ {
+- kexec_args[0] = fw_arg0;
+- kexec_args[1] = fw_arg1;
+- kexec_args[2] = fw_arg2;
+- kexec_args[3] = fw_arg3;
++ int i;
+
+ pr_info("kexec_args[0] (argc): %lu\n", kexec_args[0]);
+ pr_info("kexec_args[1] (argv): %p\n", (void *)kexec_args[1]);
+ pr_info("kexec_args[2] (env ): %p\n", (void *)kexec_args[2]);
+ pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
+-}
+
+-#define ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
++ for (i = 0; i < kexec_args[0]; i++)
++ pr_info("kexec_argv[%d] = %p, %s\n", i,
++ (char *)kexec_argv[i], (char *)kexec_argv[i]);
++}
+
+-int machine_kexec_pass_args(struct kimage *image)
++static void
++machine_kexec_init_argv(struct kimage *image)
+ {
+- int i, argc = 0;
+- char *bootloader = "kexec";
+- int *kexec_argv = (int *)kexec_args[1];
++ void __user *buf;
++ size_t bufsz;
++ size_t size;
++ int i;
+
++ bufsz = 0;
+ for (i = 0; i < image->nr_segments; i++) {
+- if (!strncmp(bootloader, (char *)image->segment[i].buf,
+- strlen(bootloader))) {
+- /*
+- * convert command line string to array
+- * of parameters (as bootloader does).
+- */
+- /*
+- * Note: we do treat the 1st string "kexec" as an
+- * argument ;-) so, argc here is 1.
+- */
+- char *str = (char *)image->segment[i].buf;
+- char *ptr = strchr(str, ' ');
+- char *kbuf = (char *)kexec_argv[0];
+- /* Whenever --command-line or --append used, "kexec" is copied */
+- argc = 1;
+- /* Parse the offset */
+- while (ptr && (ARGV_MAX_ARGS > argc)) {
+- *ptr = '\0';
+- if (ptr[1] != ' ' && ptr[1] != '\0') {
+- int offt = (int)(ptr - str + 1);
+- kexec_argv[argc] = (int)kbuf + offt;
+- argc++;
+- }
+- ptr = strchr(ptr + 1, ' ');
+- }
+- if (argc > 1) {
+- /* Copy to kernel space */
+- copy_from_user(kbuf, (char *)image->segment[i].buf, image->segment[i].bufsz);
+- fw_arg0 = kexec_args[0] = argc;
+- }
+- break;
++ struct kexec_segment *seg;
++
++ seg = &image->segment[i];
++ if (seg->bufsz < 6)
++ continue;
++
++ if (strncmp((char *) seg->buf, "kexec", 5))
++ continue;
++
++ /* don't copy "kexec" */
++ buf = seg->buf + 5;
++ bufsz = seg->bufsz - 5;
++ break;
++ }
++
++ if (i >= image->nr_segments)
++ return;
++
++ size = KEXEC_MIPS_ARGV_BUF_SIZE - 1;
++ size = min(size, bufsz);
++ if (size < bufsz)
++ pr_warn("kexec command line truncated to %d bytes\n", size);
++
++ /* Copy to kernel space */
++ copy_from_user(kexec_argv_buf, buf, size);
++}
++
++static void
++machine_kexec_parse_argv(struct kimage *image)
++{
++ char *reboot_code_buffer;
++ int reloc_delta;
++ char *ptr;
++ int argc;
++ int i;
++
++ ptr = kexec_argv_buf;
++ argc = 0;
++
++ /*
++ * convert command line string to array of parameters
++ * (as bootloader does).
++ */
++ while (ptr && *ptr && (KEXEC_MIPS_ARGV_MAX_ARGS > argc)) {
++ if (*ptr == ' ') {
++ *ptr++ = '\0';
++ continue;
+ }
++
++ kexec_argv[argc++] = (int) ptr;
++ ptr = strchr(ptr, ' ');
+ }
+
+- pr_info("argc = %lu\n", kexec_args[0]);
+- for (i = 0; i < kexec_args[0]; i++)
+- pr_info("argv[%d] = %p, %s\n", i, (char *)kexec_argv[i], (char *)kexec_argv[i]);
++ if (!argc)
++ return;
+
+- return 0;
++ kexec_args[0] = argc;
++ kexec_args[1] = (int) kexec_argv;
++ kexec_args[2] = 0;
++ kexec_args[3] = 0;
++
++ reboot_code_buffer = page_address(image->control_code_page);
++ reloc_delta = reboot_code_buffer - (char *) &__start___kexec_relocate;
++
++ kexec_args[1] += reloc_delta;
++ for (i = 0; i < argc; i++)
++ kexec_argv[i] += reloc_delta;
+ }
+
+ int
+@@ -95,8 +132,14 @@ machine_kexec_prepare(struct kimage *kim
+ *
+ * This can be overrided by _machine_kexec_prepare().
+ */
+- machine_kexec_init_args();
+- machine_kexec_pass_args(kimage);
++
++ kexec_args[0] = fw_arg0;
++ kexec_args[1] = fw_arg1;
++ kexec_args[2] = fw_arg2;
++ kexec_args[3] = fw_arg3;
++
++ machine_kexec_init_argv(kimage);
++ machine_kexec_parse_argv(kimage);
+
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
+@@ -152,11 +195,13 @@ machine_kexec(struct kimage *image)
+ pr_info("kexec_indirection_page = %p\n",
+ (void *)kexec_indirection_page);
+
++ pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
++ &__start___kexec_relocate, (void *)reboot_code_buffer);
++
+ memcpy((void *)reboot_code_buffer, &__start___kexec_relocate,
+ kexec_relocate_size);
+
+- pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
+- &__start___kexec_relocate, (void *)reboot_code_buffer);
++ machine_kexec_print_args();
+
+ /*
+ * The generic kexec code builds a page list with physical
--- /dev/null
+From eee16330c9de9adf7880cce9f1d32e13f89706bb Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Tue, 11 Jan 2011 13:16:47 +0000
+Subject: MIPS: Add crash and kdump support
+
+From: http://patchwork.linux-mips.org/patch/1025/
+
+Hello folks,
+
+Please find here MIPS crash and kdump patches.
+This is patch set of 3 patches:
+1. generic MIPS changes (kernel);
+2. MIPS Cavium Octeon board kexec/kdump code (kernel);
+3. Kexec user space MIPS changes.
+
+Patches were tested on the latest linux-mips@ git kernel and the latest
+kexec-tools git on Cavium Octeon 50xx board.
+
+I also made the same code working on RMI XLR/XLS boards for both
+mips32 and mips64 kernels.
+
+Best regards,
+Maxim Uvarov.
+
+------
+[ Zhangjin: Several trivial building failure has been fixed.
+
+Note: the 2nd patch can not be cleanly applied, but may be a good
+reference for the other board development:
+
+ + MIPS Cavium Octeon board kexec,kdump support
+ http://patchwork.linux-mips.org/patch/1026/
+
+And the 3rd patch has already been merged into the mainline kexec-tools:
+
+ + some kexec MIPS improvements
+ http://patchwork.linux-mips.org/patch/1027/
+
+kexec-tools is available here:
+
+ + http://horms.net/projects/kexec/
+ git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
+]
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+(limited to 'arch/mips/kernel')
+
+--- a/arch/mips/kernel/Makefile
++++ b/arch/mips/kernel/Makefile
+@@ -93,7 +93,8 @@ obj-$(CONFIG_I8253) += i8253.o
+
+ obj-$(CONFIG_GPIO_TXX9) += gpio_txx9.o
+
+-obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
++obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o crash.o
++obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
+ obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+ obj-$(CONFIG_SPINLOCK_TEST) += spinlock_test.o
+ obj-$(CONFIG_MIPS_MACHINE) += mips_machine.o
+--- /dev/null
++++ b/arch/mips/kernel/crash.c
+@@ -0,0 +1,75 @@
++#include <linux/kernel.h>
++#include <linux/smp.h>
++#include <linux/reboot.h>
++#include <linux/kexec.h>
++#include <linux/bootmem.h>
++#include <linux/crash_dump.h>
++#include <linux/delay.h>
++#include <linux/init.h>
++#include <linux/irq.h>
++#include <linux/types.h>
++#include <linux/sched.h>
++
++#ifdef CONFIG_CRASH_DUMP
++unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
++#endif
++
++/* This keeps a track of which one is crashing cpu. */
++int crashing_cpu = -1;
++static cpumask_t cpus_in_crash = CPU_MASK_NONE;
++
++#ifdef CONFIG_SMP
++void crash_shutdown_secondary(void *ignore)
++{
++ struct pt_regs *regs;
++ int cpu = smp_processor_id();
++
++ regs = task_pt_regs(current);
++
++ if (!cpu_online(cpu))
++ return;
++
++ local_irq_disable();
++ if (!cpu_isset(cpu, cpus_in_crash))
++ crash_save_cpu(regs, cpu);
++ cpu_set(cpu, cpus_in_crash);
++
++ while (!atomic_read(&kexec_ready_to_reboot))
++ cpu_relax();
++ relocated_kexec_smp_wait(NULL);
++ /* NOTREACHED */
++}
++
++static void crash_kexec_prepare_cpus(void)
++{
++ unsigned int msecs;
++
++ unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
++
++ dump_send_ipi(crash_shutdown_secondary);
++ smp_wmb();
++
++ /*
++ * The crash CPU sends an IPI and wait for other CPUs to
++ * respond. Delay of at least 10 seconds.
++ */
++ printk(KERN_EMERG "Sending IPI to other cpus...\n");
++ msecs = 10000;
++ while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
++ cpu_relax();
++ mdelay(1);
++ }
++}
++
++#else
++static void crash_kexec_prepare_cpus(void) {}
++#endif
++
++void default_machine_crash_shutdown(struct pt_regs *regs)
++{
++ local_irq_disable();
++ crashing_cpu = smp_processor_id();
++ crash_save_cpu(regs, crashing_cpu);
++ crash_kexec_prepare_cpus();
++ cpu_set(crashing_cpu, cpus_in_crash);
++}
+--- /dev/null
++++ b/arch/mips/kernel/crash_dump.c
+@@ -0,0 +1,86 @@
++#include <linux/highmem.h>
++#include <linux/bootmem.h>
++#include <linux/crash_dump.h>
++#include <asm/uaccess.h>
++
++#ifdef CONFIG_PROC_VMCORE
++static int __init parse_elfcorehdr(char *p)
++{
++ if (p)
++ elfcorehdr_addr = memparse(p, &p);
++ return 1;
++}
++__setup("elfcorehdr=", parse_elfcorehdr);
++#endif
++
++static int __init parse_savemaxmem(char *p)
++{
++ if (p)
++ saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1;
++
++ return 1;
++}
++__setup("savemaxmem=", parse_savemaxmem);
++
++
++static void *kdump_buf_page;
++
++/**
++ * copy_oldmem_page - copy one page from "oldmem"
++ * @pfn: page frame number to be copied
++ * @buf: target memory address for the copy; this can be in kernel address
++ * space or user address space (see @userbuf)
++ * @csize: number of bytes to copy
++ * @offset: offset in bytes into the page (based on pfn) to begin the copy
++ * @userbuf: if set, @buf is in user address space, use copy_to_user(),
++ * otherwise @buf is in kernel address space, use memcpy().
++ *
++ * Copy a page from "oldmem". For this page, there is no pte mapped
++ * in the current kernel.
++ *
++ * Calling copy_to_user() in atomic context is not desirable. Hence first
++ * copying the data to a pre-allocated kernel page and then copying to user
++ * space in non-atomic context.
++ */
++ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
++ size_t csize, unsigned long offset, int userbuf)
++{
++ void *vaddr;
++
++ if (!csize)
++ return 0;
++
++ vaddr = kmap_atomic_pfn(pfn, KM_PTE0);
++
++ if (!userbuf) {
++ memcpy(buf, (vaddr + offset), csize);
++ kunmap_atomic(vaddr, KM_PTE0);
++ } else {
++ if (!kdump_buf_page) {
++ printk(KERN_WARNING "Kdump: Kdump buffer page not"
++ " allocated\n");
++ return -EFAULT;
++ }
++ copy_page(kdump_buf_page, vaddr);
++ kunmap_atomic(vaddr, KM_PTE0);
++ if (copy_to_user(buf, (kdump_buf_page + offset), csize))
++ return -EFAULT;
++ }
++
++ return csize;
++}
++
++static int __init kdump_buf_page_init(void)
++{
++ int ret = 0;
++
++ kdump_buf_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
++ if (!kdump_buf_page) {
++ printk(KERN_WARNING "Kdump: Failed to allocate kdump buffer"
++ " page\n");
++ ret = -ENOMEM;
++ }
++
++ return ret;
++}
++arch_initcall(kdump_buf_page_init);
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -19,9 +19,19 @@ extern const size_t relocate_new_kernel_
+ extern unsigned long kexec_start_address;
+ extern unsigned long kexec_indirection_page;
+
++int (*_machine_kexec_prepare)(struct kimage *) = NULL;
++void (*_machine_kexec_shutdown)(void) = NULL;
++void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
++#ifdef CONFIG_SMP
++void (*relocated_kexec_smp_wait) (void *);
++atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
++#endif
++
+ int
+ machine_kexec_prepare(struct kimage *kimage)
+ {
++ if (_machine_kexec_prepare)
++ return _machine_kexec_prepare(kimage);
+ return 0;
+ }
+
+@@ -33,11 +43,17 @@ machine_kexec_cleanup(struct kimage *kim
+ void
+ machine_shutdown(void)
+ {
++ if (_machine_kexec_shutdown)
++ _machine_kexec_shutdown();
+ }
+
+ void
+ machine_crash_shutdown(struct pt_regs *regs)
+ {
++ if (_machine_crash_shutdown)
++ _machine_crash_shutdown(regs);
++ else
++ default_machine_crash_shutdown(regs);
+ }
+
+ typedef void (*noretfun_t)(void) __attribute__((noreturn));
+@@ -52,7 +68,9 @@ machine_kexec(struct kimage *image)
+ reboot_code_buffer =
+ (unsigned long)page_address(image->control_code_page);
+
+- kexec_start_address = (unsigned long) phys_to_virt(image->start);
++ kexec_start_address =
++ (unsigned long) phys_to_virt(image->start);
++
+ kexec_indirection_page =
+ (unsigned long) phys_to_virt(image->head & PAGE_MASK);
+
+@@ -63,7 +81,7 @@ machine_kexec(struct kimage *image)
+ * The generic kexec code builds a page list with physical
+ * addresses. they are directly accessible through KSEG0 (or
+ * CKSEG0 or XPHYS if on 64bit system), hence the
+- * pys_to_virt() call.
++ * phys_to_virt() call.
+ */
+ for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
+ ptr = (entry & IND_INDIRECTION) ?
+@@ -81,5 +99,13 @@ machine_kexec(struct kimage *image)
+ printk("Will call new kernel at %08lx\n", image->start);
+ printk("Bye ...\n");
+ __flush_cache_all();
++#ifdef CONFIG_SMP
++ /* All secondary cpus now may jump to kexec_wait cycle */
++ relocated_kexec_smp_wait = reboot_code_buffer +
++ (void *)(kexec_smp_wait - relocate_new_kernel);
++ smp_wmb();
++ atomic_set(&kexec_ready_to_reboot, 1);
++#endif
+ ((noretfun_t) reboot_code_buffer)();
+ }
++
+--- a/arch/mips/kernel/relocate_kernel.S
++++ b/arch/mips/kernel/relocate_kernel.S
+@@ -15,6 +15,11 @@
+ #include <asm/addrspace.h>
+
+ LEAF(relocate_new_kernel)
++ PTR_L a0, arg0
++ PTR_L a1, arg1
++ PTR_L a2, arg2
++ PTR_L a3, arg3
++
+ PTR_L s0, kexec_indirection_page
+ PTR_L s1, kexec_start_address
+
+@@ -26,7 +31,6 @@ process_entry:
+ and s3, s2, 0x1
+ beq s3, zero, 1f
+ and s4, s2, ~0x1 /* store destination addr in s4 */
+- move a0, s4
+ b process_entry
+
+ 1:
+@@ -60,23 +64,100 @@ copy_word:
+ b process_entry
+
+ done:
++#ifdef CONFIG_SMP
++ /* kexec_flag reset is signal to other CPUs what kernel
++ was moved to it's location. Note - we need relocated address
++ of kexec_flag. */
++
++ bal 1f
++ 1: move t1,ra;
++ PTR_LA t2,1b
++ PTR_LA t0,kexec_flag
++ PTR_SUB t0,t0,t2;
++ PTR_ADD t0,t1,t0;
++ LONG_S zero,(t0)
++#endif
++
++ sync
+ /* jump to kexec_start_address */
+ j s1
+ END(relocate_new_kernel)
+
+-kexec_start_address:
+- EXPORT(kexec_start_address)
++#ifdef CONFIG_SMP
++/*
++ * Other CPUs should wait until code is relocated and
++ * then start at entry (?) point.
++ */
++LEAF(kexec_smp_wait)
++ PTR_L a0, s_arg0
++ PTR_L a1, s_arg1
++ PTR_L a2, s_arg2
++ PTR_L a3, s_arg3
++ PTR_L s1, kexec_start_address
++
++ /* Non-relocated address works for args and kexec_start_address ( old
++ * kernel is not overwritten). But we need relocated address of
++ * kexec_flag.
++ */
++
++ bal 1f
++1: move t1,ra;
++ PTR_LA t2,1b
++ PTR_LA t0,kexec_flag
++ PTR_SUB t0,t0,t2;
++ PTR_ADD t0,t1,t0;
++
++1: LONG_L s0, (t0)
++ bne s0, zero,1b
++
++ sync
++ j s1
++ END(kexec_smp_wait)
++#endif
++
++#ifdef __mips64
++ /* all PTR's must be aligned to 8 byte in 64-bit mode */
++ .align 3
++#endif
++
++/* All parameters to new kernel are passed in registers a0-a3.
++ * kexec_args[0..3] are uses to prepare register values.
++ */
++
++EXPORT(kexec_args)
++arg0: PTR 0x0
++arg1: PTR 0x0
++arg2: PTR 0x0
++arg3: PTR 0x0
++ .size kexec_args,PTRSIZE*4
++
++#ifdef CONFIG_SMP
++/*
++ * Secondary CPUs may have different kernel parameters in
++ * their registers a0-a3. secondary_kexec_args[0..3] are used
++ * to prepare register values.
++ */
++EXPORT(secondary_kexec_args)
++s_arg0: PTR 0x0
++s_arg1: PTR 0x0
++s_arg2: PTR 0x0
++s_arg3: PTR 0x0
++ .size secondary_kexec_args,PTRSIZE*4
++kexec_flag:
++ LONG 0x1
++
++#endif
++
++EXPORT(kexec_start_address)
+ PTR 0x0
+ .size kexec_start_address, PTRSIZE
+
+-kexec_indirection_page:
+- EXPORT(kexec_indirection_page)
++EXPORT(kexec_indirection_page)
+ PTR 0
+ .size kexec_indirection_page, PTRSIZE
+
+ relocate_new_kernel_end:
+
+-relocate_new_kernel_size:
+- EXPORT(relocate_new_kernel_size)
++EXPORT(relocate_new_kernel_size)
+ PTR relocate_new_kernel_end - relocate_new_kernel
+ .size relocate_new_kernel_size, PTRSIZE
+--- a/arch/mips/kernel/setup.c
++++ b/arch/mips/kernel/setup.c
+@@ -21,6 +21,7 @@
+ #include <linux/console.h>
+ #include <linux/pfn.h>
+ #include <linux/debugfs.h>
++#include <linux/kexec.h>
+
+ #include <asm/addrspace.h>
+ #include <asm/bootinfo.h>
+@@ -488,12 +489,62 @@ static void __init arch_mem_init(char **
+ }
+
+ bootmem_init();
++#ifdef CONFIG_KEXEC
++ if (crashk_res.start != crashk_res.end)
++ reserve_bootmem(crashk_res.start,
++ crashk_res.end - crashk_res.start + 1,
++ BOOTMEM_DEFAULT);
++#endif
+ device_tree_init();
+ sparse_init();
+ plat_swiotlb_setup();
+ paging_init();
+ }
+
++#ifdef CONFIG_KEXEC
++static inline unsigned long long get_total_mem(void)
++{
++ unsigned long long total;
++ total = max_pfn - min_low_pfn;
++ return total << PAGE_SHIFT;
++}
++
++static void __init mips_parse_crashkernel(void)
++{
++ unsigned long long total_mem;
++ unsigned long long crash_size, crash_base;
++ int ret;
++
++ total_mem = get_total_mem();
++ ret = parse_crashkernel(boot_command_line, total_mem,
++ &crash_size, &crash_base);
++ if (ret != 0 || crash_size <= 0)
++ return;
++
++ crashk_res.start = crash_base;
++ crashk_res.end = crash_base + crash_size - 1;
++}
++static void __init request_crashkernel(struct resource *res)
++{
++ int ret;
++
++ ret = request_resource(res, &crashk_res);
++ if (!ret)
++ printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
++ "for crashkernel\n",
++ (unsigned long)((crashk_res.end -
++ crashk_res.start + 1) >> 20),
++ (unsigned long)(crashk_res.start >> 20));
++}
++#else
++static void __init mips_parse_crashkernel(void)
++{
++}
++static void __init request_crashkernel(struct resource *res)
++{
++}
++#endif
++
+ static void __init resource_init(void)
+ {
+ int i;
+@@ -509,6 +560,8 @@ static void __init resource_init(void)
+ /*
+ * Request address space for all standard RAM.
+ */
++ mips_parse_crashkernel();
++
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ struct resource *res;
+ unsigned long start, end;
+@@ -544,6 +597,7 @@ static void __init resource_init(void)
+ */
+ request_resource(res, &code_resource);
+ request_resource(res, &data_resource);
++ request_crashkernel(res);
+ }
+ }
+
+--- a/arch/mips/kernel/smp.c
++++ b/arch/mips/kernel/smp.c
+@@ -433,3 +433,21 @@ void flush_tlb_one(unsigned long vaddr)
+
+ EXPORT_SYMBOL(flush_tlb_page);
+ EXPORT_SYMBOL(flush_tlb_one);
++
++#if defined(CONFIG_KEXEC)
++void (*dump_ipi_function_ptr)(void *) = NULL;
++void dump_send_ipi(void (*dump_ipi_callback)(void *))
++{
++ int i;
++ int cpu = smp_processor_id();
++
++ dump_ipi_function_ptr = dump_ipi_callback;
++ smp_mb();
++ for_each_online_cpu(i)
++ if (i != cpu)
++ core_send_ipi(i, SMP_DUMP);
++
++}
++EXPORT_SYMBOL(dump_send_ipi);
++#endif
++
+--- a/arch/mips/include/asm/kexec.h
++++ b/arch/mips/include/asm/kexec.h
+@@ -9,22 +9,45 @@
+ #ifndef _MIPS_KEXEC
+ # define _MIPS_KEXEC
+
++#include <asm/stacktrace.h>
++
++extern unsigned long long elfcorehdr_addr;
++
+ /* Maximum physical address we can use pages from */
+ #define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000)
+ /* Maximum address we can reach in physical address mode */
+ #define KEXEC_DESTINATION_MEMORY_LIMIT (0x20000000)
+ /* Maximum address we can use for the control code buffer */
+ #define KEXEC_CONTROL_MEMORY_LIMIT (0x20000000)
+-
+-#define KEXEC_CONTROL_PAGE_SIZE 4096
++/* Reserve 3*4096 bytes for board-specific info */
++#define KEXEC_CONTROL_PAGE_SIZE (4096 + 3*4096)
+
+ /* The native architecture */
+ #define KEXEC_ARCH KEXEC_ARCH_MIPS
++#define MAX_NOTE_BYTES 1024
+
+ static inline void crash_setup_regs(struct pt_regs *newregs,
+- struct pt_regs *oldregs)
++ struct pt_regs *oldregs)
+ {
+- /* Dummy implementation for now */
++ if (oldregs)
++ memcpy(newregs, oldregs, sizeof(*newregs));
++ else
++ prepare_frametrace(newregs);
+ }
+
++#ifdef CONFIG_KEXEC
++struct kimage;
++extern unsigned long kexec_args[4];
++extern int (*_machine_kexec_prepare)(struct kimage *);
++extern void (*_machine_kexec_shutdown)(void);
++extern void (*_machine_crash_shutdown)(struct pt_regs *regs);
++extern void default_machine_crash_shutdown(struct pt_regs *regs);
++#ifdef CONFIG_SMP
++extern const unsigned char kexec_smp_wait[];
++extern unsigned long secondary_kexec_args[4];
++extern void (*relocated_kexec_smp_wait) (void *);
++extern atomic_t kexec_ready_to_reboot;
++#endif
++#endif
++
+ #endif /* !_MIPS_KEXEC */
+--- a/arch/mips/include/asm/smp.h
++++ b/arch/mips/include/asm/smp.h
+@@ -40,6 +40,8 @@ extern int __cpu_logical_map[NR_CPUS];
+ #define SMP_CALL_FUNCTION 0x2
+ /* Octeon - Tell another core to flush its icache */
+ #define SMP_ICACHE_FLUSH 0x4
++/* Used by kexec crashdump to save all cpu's state */
++#define SMP_DUMP 0x8
+
+ extern volatile cpumask_t cpu_callin_map;
+
+@@ -91,4 +93,9 @@ static inline void arch_send_call_functi
+ mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
+ }
+
++extern void core_send_ipi(int cpu, unsigned int action);
++#if defined(CONFIG_KEXEC)
++extern void (*dump_ipi_function_ptr)(void *);
++void dump_send_ipi(void (*dump_ipi_callback)(void *));
++#endif
+ #endif /* __ASM_SMP_H */
--- /dev/null
+From 03cd81fbca6b91317ec1a7b3b3c09fb8d08f83a6 Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Tue, 11 Jan 2011 18:42:08 +0000
+Subject: MIPS: Kexec: Enhance the support
+
+Changes:
+ o Print more information in machine_kexec() for debugging
+ E.g. with this information, the kexec_start_address has been found
+ it was wrong with 64bit kernel / o32 kexec-tools. Which must be
+ fixed later.
+ o Link relocate_kernel.S to a section for future extension
+ This allows more functions can be added for the kexec relocation
+ part even written in C. to add code into that section, you just need
+ to mark your function or data with __kexec or
+ __attribute__((__section__(".__kexec.relocate")))
+
+TODO:
+
+1. Make 64bit kernel / o32|n32|64 kexec-tools works
+
+Fix the user-space kexec-tools, seems the tool only work for 32bit
+machine. So, we need to add 64bit support for it. The address of the
+entry point(kexec_start_address) is wrong and make the "kexec -e" fail.
+the real entry point must be read from the new kernel image by the
+user-space kexec-tools, otherwise, it will not work. The above 64bit
+support tested is 64bit kernel with o32 user-space kexec-tools. The root
+cause may be the different definition of virt_to_phys() and
+phys_to_virt() in the kexec-tools and kernel space for 64bit system /
+o32 kernel.
+
+Ref: http://www.linux-mips.org/archives/linux-mips/2009-08/msg00149.html
+
+2. Pass the arguments from kexec-tools to the new kernel image
+
+Please refer to: "MIPS: Loongson: Kexec: Pass parameters to new kernel"
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+--- a/arch/mips/include/asm/kexec.h
++++ b/arch/mips/include/asm/kexec.h
+@@ -36,6 +36,16 @@ static inline void crash_setup_regs(stru
+ }
+
+ #ifdef CONFIG_KEXEC
++
++#define __kexec __attribute__((__section__(".__kexec.relocate")))
++
++/* The linker tells us where the relocate_new_kernel part is. */
++extern const unsigned char __start___kexec_relocate;
++extern const unsigned char __end___kexec_relocate;
++
++extern unsigned long kexec_start_address;
++extern unsigned long kexec_indirection_page;
++
+ struct kimage;
+ extern unsigned long kexec_args[4];
+ extern int (*_machine_kexec_prepare)(struct kimage *);
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -13,12 +13,6 @@
+ #include <asm/cacheflush.h>
+ #include <asm/page.h>
+
+-extern const unsigned char relocate_new_kernel[];
+-extern const size_t relocate_new_kernel_size;
+-
+-extern unsigned long kexec_start_address;
+-extern unsigned long kexec_indirection_page;
+-
+ int (*_machine_kexec_prepare)(struct kimage *) = NULL;
+ void (*_machine_kexec_shutdown)(void) = NULL;
+ void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
+@@ -61,21 +55,34 @@ typedef void (*noretfun_t)(void) __attri
+ void
+ machine_kexec(struct kimage *image)
+ {
++ unsigned long kexec_relocate_size;
+ unsigned long reboot_code_buffer;
+ unsigned long entry;
+ unsigned long *ptr;
+
++ kexec_relocate_size = (unsigned long)(&__end___kexec_relocate) -
++ (unsigned long)(&__start___kexec_relocate);
++ pr_info("kexec_relocate_size = %lu\n", kexec_relocate_size);
++
+ reboot_code_buffer =
+ (unsigned long)page_address(image->control_code_page);
++ pr_info("reboot_code_buffer = %p\n", (void *)reboot_code_buffer);
+
+ kexec_start_address =
+ (unsigned long) phys_to_virt(image->start);
++ pr_info("kexec_start_address(entry point of new kernel) = %p\n",
++ (void *)kexec_start_address);
+
+ kexec_indirection_page =
+ (unsigned long) phys_to_virt(image->head & PAGE_MASK);
++ pr_info("kexec_indirection_page = %p\n",
++ (void *)kexec_indirection_page);
+
+- memcpy((void*)reboot_code_buffer, relocate_new_kernel,
+- relocate_new_kernel_size);
++ memcpy((void *)reboot_code_buffer, &__start___kexec_relocate,
++ kexec_relocate_size);
++
++ pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
++ &__start___kexec_relocate, (void *)reboot_code_buffer);
+
+ /*
+ * The generic kexec code builds a page list with physical
+@@ -96,8 +103,8 @@ machine_kexec(struct kimage *image)
+ */
+ local_irq_disable();
+
+- printk("Will call new kernel at %08lx\n", image->start);
+- printk("Bye ...\n");
++ pr_info("Will call new kernel at %p\n", (void *)kexec_start_address);
++ pr_info("Bye ...\n");
+ __flush_cache_all();
+ #ifdef CONFIG_SMP
+ /* All secondary cpus now may jump to kexec_wait cycle */
+@@ -108,4 +115,3 @@ machine_kexec(struct kimage *image)
+ #endif
+ ((noretfun_t) reboot_code_buffer)();
+ }
+-
+--- a/arch/mips/kernel/relocate_kernel.S
++++ b/arch/mips/kernel/relocate_kernel.S
+@@ -14,6 +14,8 @@
+ #include <asm/stackframe.h>
+ #include <asm/addrspace.h>
+
++ .section .kexec.relocate, "ax"
++
+ LEAF(relocate_new_kernel)
+ PTR_L a0, arg0
+ PTR_L a1, arg1
+@@ -155,9 +157,3 @@ EXPORT(kexec_start_address)
+ EXPORT(kexec_indirection_page)
+ PTR 0
+ .size kexec_indirection_page, PTRSIZE
+-
+-relocate_new_kernel_end:
+-
+-EXPORT(relocate_new_kernel_size)
+- PTR relocate_new_kernel_end - relocate_new_kernel
+- .size relocate_new_kernel_size, PTRSIZE
+--- a/arch/mips/kernel/vmlinux.lds.S
++++ b/arch/mips/kernel/vmlinux.lds.S
+@@ -50,6 +50,10 @@ SECTIONS
+ *(.text.*)
+ *(.fixup)
+ *(.gnu.warning)
++ __start___kexec_relocate = .;
++ KEEP(*(.kexec.relocate))
++ KEEP(*(.__kexec.relocate))
++ __end___kexec_relocate = .;
+ } :text = 0
+ _etext = .; /* End of text section */
+
--- /dev/null
+From 49d07a29653b1f2c6ae273b3d8fe93d981f43004 Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Wed, 12 Jan 2011 20:59:32 +0000
+Subject: MIPS: Kexec: Init the arguments for the new kernel image
+
+Whenever the kexec-tools pass the command lines to the new kernel image,
+init the arguments as the ones for the 1st kernel image. This fixed the
+booting failure of Kexec on YeeLoong.
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -10,6 +10,7 @@
+ #include <linux/mm.h>
+ #include <linux/delay.h>
+
++#include <asm/bootinfo.h>
+ #include <asm/cacheflush.h>
+ #include <asm/page.h>
+
+@@ -21,9 +22,30 @@ void (*relocated_kexec_smp_wait) (void *
+ atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
+ #endif
+
++static void machine_kexec_init_args(void)
++{
++ kexec_args[0] = fw_arg0;
++ kexec_args[1] = fw_arg1;
++ kexec_args[2] = fw_arg2;
++ kexec_args[3] = fw_arg3;
++
++ pr_info("kexec_args[0] (argc): %lu\n", kexec_args[0]);
++ pr_info("kexec_args[1] (argv): %p\n", (void *)kexec_args[1]);
++ pr_info("kexec_args[2] (env ): %p\n", (void *)kexec_args[2]);
++ pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
++}
++
+ int
+ machine_kexec_prepare(struct kimage *kimage)
+ {
++ /*
++ * Whenever arguments passed from kexec-tools, Init the arguments as
++ * the original ones to avoid booting failure.
++ *
++ * This can be overrided by _machine_kexec_prepare().
++ */
++ machine_kexec_init_args();
++
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
+ return 0;
--- /dev/null
+From 240c76841b26f1b09aaced33414ee1d08b6454cf Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Sat, 15 Jan 2011 12:46:03 +0000
+Subject: MIPS: Get kernel parameters from kexec-tools
+
+Before, we simply use the command lines from the original bootloader,
+but it is not convenient. Now, we accept the kernel parameters from the
+--command-line or --append option of the kexec-tools. But If not
+--command-line or --apend option indicated, will fall back to use the
+ones from the original bootloader.
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -13,6 +13,7 @@
+ #include <asm/bootinfo.h>
+ #include <asm/cacheflush.h>
+ #include <asm/page.h>
++#include <asm/uaccess.h>
+
+ int (*_machine_kexec_prepare)(struct kimage *) = NULL;
+ void (*_machine_kexec_shutdown)(void) = NULL;
+@@ -35,6 +36,56 @@ static void machine_kexec_init_args(void
+ pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
+ }
+
++#define ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
++
++int machine_kexec_pass_args(struct kimage *image)
++{
++ int i, argc = 0;
++ char *bootloader = "kexec";
++ int *kexec_argv = (int *)kexec_args[1];
++
++ for (i = 0; i < image->nr_segments; i++) {
++ if (!strncmp(bootloader, (char *)image->segment[i].buf,
++ strlen(bootloader))) {
++ /*
++ * convert command line string to array
++ * of parameters (as bootloader does).
++ */
++ /*
++ * Note: we do treat the 1st string "kexec" as an
++ * argument ;-) so, argc here is 1.
++ */
++ char *str = (char *)image->segment[i].buf;
++ char *ptr = strchr(str, ' ');
++ char *kbuf = (char *)kexec_argv[0];
++ /* Whenever --command-line or --append used, "kexec" is copied */
++ argc = 1;
++ /* Parse the offset */
++ while (ptr && (ARGV_MAX_ARGS > argc)) {
++ *ptr = '\0';
++ if (ptr[1] != ' ' && ptr[1] != '\0') {
++ int offt = (int)(ptr - str + 1);
++ kexec_argv[argc] = (int)kbuf + offt;
++ argc++;
++ }
++ ptr = strchr(ptr + 1, ' ');
++ }
++ if (argc > 1) {
++ /* Copy to kernel space */
++ copy_from_user(kbuf, (char *)image->segment[i].buf, image->segment[i].bufsz);
++ fw_arg0 = kexec_args[0] = argc;
++ }
++ break;
++ }
++ }
++
++ pr_info("argc = %lu\n", kexec_args[0]);
++ for (i = 0; i < kexec_args[0]; i++)
++ pr_info("argv[%d] = %p, %s\n", i, (char *)kexec_argv[i], (char *)kexec_argv[i]);
++
++ return 0;
++}
++
+ int
+ machine_kexec_prepare(struct kimage *kimage)
+ {
+@@ -45,6 +96,7 @@ machine_kexec_prepare(struct kimage *kim
+ * This can be overrided by _machine_kexec_prepare().
+ */
+ machine_kexec_init_args();
++ machine_kexec_pass_args(kimage);
+
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
--- /dev/null
+From 4aded085fa0057a9a1e1dcec631f950307360c1f Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Tue, 11 Jan 2011 13:46:19 +0000
+Subject: MIPS: Fix compiling failure of relocate_kernel.S
+
+The following errors is fixed with the help of <asm/asm_nosec.h>. for
+this file need to put different symbols in the same section, the
+original LEAF, NESTED and EXPORT (without explicit section indication)
+must be used, <asm/asm_nosec.h> does it.
+
+arch/mips/kernel/relocate_kernel.S: Assembler messages:
+arch/mips/kernel/relocate_kernel.S:162: Error: operation combines symbols in different segments
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+(limited to 'arch/mips/kernel')
+
+--- a/arch/mips/kernel/relocate_kernel.S
++++ b/arch/mips/kernel/relocate_kernel.S
+@@ -7,6 +7,7 @@
+ */
+
+ #include <asm/asm.h>
++#include <asm/asm_nosec.h>
+ #include <asm/asmmacro.h>
+ #include <asm/regdef.h>
+ #include <asm/page.h>
+--- /dev/null
++++ b/arch/mips/include/asm/asm_nosec.h
+@@ -0,0 +1,53 @@
++/*
++ * This file is subject to the terms and conditions of the GNU General Public
++ * License. See the file "COPYING" in the main directory of this archive
++ * for more details.
++ *
++ * Copyright (C) 1995, 1996, 1997, 1999, 2001 by Ralf Baechle
++ * Copyright (C) 1999 by Silicon Graphics, Inc.
++ * Copyright (C) 2001 MIPS Technologies, Inc.
++ * Copyright (C) 2002 Maciej W. Rozycki
++ * Copyright (C) 2010 Wu Zhangjin <wuzhangjin@gmail.com>
++ *
++ * Derive from <asm/asm.h>
++ *
++ * Override the macros without -ffunction-sections and -fdata-sections support.
++ * If several functions or data must be put in the same section, please include
++ * this header file after the <asm/asm.h> to override the generic definition.
++ */
++
++#ifndef __ASM_ASM_NOSEC_H
++#define __ASM_ASM_NOSEC_H
++
++#undef LEAF
++#undef NESTED
++#undef EXPORT
++
++/*
++ * LEAF - declare leaf routine
++ */
++#define LEAF(symbol) \
++ .globl symbol; \
++ .align 2; \
++ .type symbol, @function; \
++ .ent symbol, 0; \
++symbol: .frame sp, 0, ra
++
++/*
++ * NESTED - declare nested routine entry point
++ */
++#define NESTED(symbol, framesize, rpc) \
++ .globl symbol; \
++ .align 2; \
++ .type symbol, @function; \
++ .ent symbol, 0; \
++symbol: .frame sp, framesize, rpc
++
++/*
++ * EXPORT - export definition of symbol
++ */
++#define EXPORT(symbol) \
++ .globl symbol; \
++symbol:
++
++#endif /* __ASM_ASM_NOSEC_H */
--- /dev/null
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -23,67 +23,104 @@ void (*relocated_kexec_smp_wait) (void *
+ atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
+ #endif
+
+-static void machine_kexec_init_args(void)
++#define KEXEC_MIPS_ARGV_BUF_SIZE COMMAND_LINE_SIZE
++#define KEXEC_MIPS_ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
++
++char kexec_argv_buf[KEXEC_MIPS_ARGV_BUF_SIZE] __kexec;
++int kexec_argv[KEXEC_MIPS_ARGV_MAX_ARGS] __kexec;
++
++static void
++machine_kexec_print_args(void)
+ {
+- kexec_args[0] = fw_arg0;
+- kexec_args[1] = fw_arg1;
+- kexec_args[2] = fw_arg2;
+- kexec_args[3] = fw_arg3;
++ int i;
+
+ pr_info("kexec_args[0] (argc): %lu\n", kexec_args[0]);
+ pr_info("kexec_args[1] (argv): %p\n", (void *)kexec_args[1]);
+ pr_info("kexec_args[2] (env ): %p\n", (void *)kexec_args[2]);
+ pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
+-}
+
+-#define ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
++ for (i = 0; i < kexec_args[0]; i++)
++ pr_info("kexec_argv[%d] = %p, %s\n", i,
++ (char *)kexec_argv[i], (char *)kexec_argv[i]);
++}
+
+-int machine_kexec_pass_args(struct kimage *image)
++static void
++machine_kexec_init_argv(struct kimage *image)
+ {
+- int i, argc = 0;
+- char *bootloader = "kexec";
+- int *kexec_argv = (int *)kexec_args[1];
++ void __user *buf;
++ size_t bufsz;
++ size_t size;
++ int i;
+
++ bufsz = 0;
+ for (i = 0; i < image->nr_segments; i++) {
+- if (!strncmp(bootloader, (char *)image->segment[i].buf,
+- strlen(bootloader))) {
+- /*
+- * convert command line string to array
+- * of parameters (as bootloader does).
+- */
+- /*
+- * Note: we do treat the 1st string "kexec" as an
+- * argument ;-) so, argc here is 1.
+- */
+- char *str = (char *)image->segment[i].buf;
+- char *ptr = strchr(str, ' ');
+- char *kbuf = (char *)kexec_argv[0];
+- /* Whenever --command-line or --append used, "kexec" is copied */
+- argc = 1;
+- /* Parse the offset */
+- while (ptr && (ARGV_MAX_ARGS > argc)) {
+- *ptr = '\0';
+- if (ptr[1] != ' ' && ptr[1] != '\0') {
+- int offt = (int)(ptr - str + 1);
+- kexec_argv[argc] = (int)kbuf + offt;
+- argc++;
+- }
+- ptr = strchr(ptr + 1, ' ');
+- }
+- if (argc > 1) {
+- /* Copy to kernel space */
+- copy_from_user(kbuf, (char *)image->segment[i].buf, image->segment[i].bufsz);
+- fw_arg0 = kexec_args[0] = argc;
+- }
+- break;
++ struct kexec_segment *seg;
++
++ seg = &image->segment[i];
++ if (seg->bufsz < 6)
++ continue;
++
++ if (strncmp((char *) seg->buf, "kexec", 5))
++ continue;
++
++ /* don't copy "kexec" */
++ buf = seg->buf + 5;
++ bufsz = seg->bufsz - 5;
++ break;
++ }
++
++ if (i >= image->nr_segments)
++ return;
++
++ size = KEXEC_MIPS_ARGV_BUF_SIZE - 1;
++ size = min(size, bufsz);
++ if (size < bufsz)
++ pr_warn("kexec command line truncated to %d bytes\n", size);
++
++ /* Copy to kernel space */
++ copy_from_user(kexec_argv_buf, buf, size);
++}
++
++static void
++machine_kexec_parse_argv(struct kimage *image)
++{
++ char *reboot_code_buffer;
++ int reloc_delta;
++ char *ptr;
++ int argc;
++ int i;
++
++ ptr = kexec_argv_buf;
++ argc = 0;
++
++ /*
++ * convert command line string to array of parameters
++ * (as bootloader does).
++ */
++ while (ptr && *ptr && (KEXEC_MIPS_ARGV_MAX_ARGS > argc)) {
++ if (*ptr == ' ') {
++ *ptr++ = '\0';
++ continue;
+ }
++
++ kexec_argv[argc++] = (int) ptr;
++ ptr = strchr(ptr, ' ');
+ }
+
+- pr_info("argc = %lu\n", kexec_args[0]);
+- for (i = 0; i < kexec_args[0]; i++)
+- pr_info("argv[%d] = %p, %s\n", i, (char *)kexec_argv[i], (char *)kexec_argv[i]);
++ if (!argc)
++ return;
+
+- return 0;
++ kexec_args[0] = argc;
++ kexec_args[1] = (int) kexec_argv;
++ kexec_args[2] = 0;
++ kexec_args[3] = 0;
++
++ reboot_code_buffer = page_address(image->control_code_page);
++ reloc_delta = reboot_code_buffer - (char *) &__start___kexec_relocate;
++
++ kexec_args[1] += reloc_delta;
++ for (i = 0; i < argc; i++)
++ kexec_argv[i] += reloc_delta;
+ }
+
+ int
+@@ -95,8 +132,14 @@ machine_kexec_prepare(struct kimage *kim
+ *
+ * This can be overrided by _machine_kexec_prepare().
+ */
+- machine_kexec_init_args();
+- machine_kexec_pass_args(kimage);
++
++ kexec_args[0] = fw_arg0;
++ kexec_args[1] = fw_arg1;
++ kexec_args[2] = fw_arg2;
++ kexec_args[3] = fw_arg3;
++
++ machine_kexec_init_argv(kimage);
++ machine_kexec_parse_argv(kimage);
+
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
+@@ -152,11 +195,13 @@ machine_kexec(struct kimage *image)
+ pr_info("kexec_indirection_page = %p\n",
+ (void *)kexec_indirection_page);
+
++ pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
++ &__start___kexec_relocate, (void *)reboot_code_buffer);
++
+ memcpy((void *)reboot_code_buffer, &__start___kexec_relocate,
+ kexec_relocate_size);
+
+- pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
+- &__start___kexec_relocate, (void *)reboot_code_buffer);
++ machine_kexec_print_args();
+
+ /*
+ * The generic kexec code builds a page list with physical
projects / openwrt / staging / hauke.git / commitdiff