From e2f3f8b4a497d26bdcd55a53246ec2e613ae0fd4 Mon Sep 17 00:00:00 2001 From: Nylon Chen Date: Thu, 8 Nov 2018 19:28:15 +0800 Subject: [PATCH] nds32: support hardware prefetcher We add a config for user to enable or disable this feature. It can be used to control the hardware prefetch function. Signed-off-by: Nylon Chen Acked-by: Greentime Hu Signed-off-by: Greentime Hu --- arch/nds32/Kconfig.cpu | 7 +++++++ arch/nds32/include/asm/bitfield.h | 6 ++++++ arch/nds32/kernel/head.S | 2 +- arch/nds32/kernel/setup.c | 7 +++++++ 4 files changed, 21 insertions(+), 1 deletion(-) diff --git a/arch/nds32/Kconfig.cpu b/arch/nds32/Kconfig.cpu index 6482ed877f97..f16edf0582b4 100644 --- a/arch/nds32/Kconfig.cpu +++ b/arch/nds32/Kconfig.cpu @@ -177,6 +177,13 @@ config CACHE_L2 Say Y here to enable L2 cache if your SoC are integrated with L2CC. If unsure, say N. +config HW_PRE + bool "Enable hardware prefetcher" + default y + help + Say Y here to enable hardware prefetcher feature. + Only when CPU_VER.REV >= 0x09 can support. + menu "Memory configuration" choice diff --git a/arch/nds32/include/asm/bitfield.h b/arch/nds32/include/asm/bitfield.h index c1619730192a..7414fcbbab4e 100644 --- a/arch/nds32/include/asm/bitfield.h +++ b/arch/nds32/include/asm/bitfield.h @@ -740,14 +740,20 @@ #define N13MISC_CTL_offRTP 1 /* Disable Return Target Predictor */ #define N13MISC_CTL_offPTEPF 2 /* Disable HPTWK L2 PTE pefetch */ #define N13MISC_CTL_offSP_SHADOW_EN 4 /* Enable shadow stack pointers */ +#define MISC_CTL_offHWPRE 11 /* Enable HardWare PREFETCH */ /* bit 6, 9:31 reserved */ #define N13MISC_CTL_makBTB ( 0x1 << N13MISC_CTL_offBTB ) #define N13MISC_CTL_makRTP ( 0x1 << N13MISC_CTL_offRTP ) #define N13MISC_CTL_makPTEPF ( 0x1 << N13MISC_CTL_offPTEPF ) #define N13MISC_CTL_makSP_SHADOW_EN ( 0x1 << N13MISC_CTL_offSP_SHADOW_EN ) +#define MISC_CTL_makHWPRE_EN ( 0x1 << MISC_CTL_offHWPRE ) +#ifdef CONFIG_HW_PRE +#define MISC_init (N13MISC_CTL_makBTB|N13MISC_CTL_makRTP|N13MISC_CTL_makSP_SHADOW_EN|MISC_CTL_makHWPRE_EN) +#else #define MISC_init (N13MISC_CTL_makBTB|N13MISC_CTL_makRTP|N13MISC_CTL_makSP_SHADOW_EN) +#endif /****************************************************************************** * PRUSR_ACC_CTL (Privileged Resource User Access Control Registers) diff --git a/arch/nds32/kernel/head.S b/arch/nds32/kernel/head.S index 2c8aac6201be..db64b78b1232 100644 --- a/arch/nds32/kernel/head.S +++ b/arch/nds32/kernel/head.S @@ -151,7 +151,7 @@ _tlb: #endif mtsr $r3, $TLB_MISC - mfsr $r0, $MISC_CTL ! Enable BTB and RTP and shadow sp + mfsr $r0, $MISC_CTL ! Enable BTB, RTP, shadow sp, and HW_PRE ori $r0, $r0, #MISC_init mtsr $r0, $MISC_CTL diff --git a/arch/nds32/kernel/setup.c b/arch/nds32/kernel/setup.c index 4b774ca433a9..31d29d92478e 100644 --- a/arch/nds32/kernel/setup.c +++ b/arch/nds32/kernel/setup.c @@ -39,6 +39,7 @@ #define HWCAP_FPU_DP 0x040000 #define HWCAP_V2 0x080000 #define HWCAP_DX_REGS 0x100000 +#define HWCAP_HWPRE 0x200000 unsigned long cpu_id, cpu_rev, cpu_cfgid; bool has_fpu = false; @@ -75,6 +76,7 @@ static const char *hwcap_str[] = { "fpu_dp", "v2", "dx_regs", + "hw_pre", NULL, }; @@ -221,6 +223,11 @@ static void __init setup_cpuinfo(void) if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskL2C) elf_hwcap |= HWCAP_L2C; +#ifdef CONFIG_HW_PRE + if (__nds32__mfsr(NDS32_SR_MISC_CTL) & MISC_CTL_makHWPRE_EN) + elf_hwcap |= HWCAP_HWPRE; +#endif + tmp = __nds32__mfsr(NDS32_SR_CACHE_CTL); if (!IS_ENABLED(CONFIG_CPU_DCACHE_DISABLE)) tmp |= CACHE_CTL_mskDC_EN; -- 2.30.2