add lzma compressed initramfs for bcm947xx

SVN-Revision: 9559

diff --git a/target/linux/brcm47xx/patches-2.6.23/500-lzma_initramfs.patch b/target/linux/brcm47xx/patches-2.6.23/500-lzma_initramfs.patch
new file mode 100644 (file)
index 0000000..b545bba
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.23/500-lzma_initramfs.patch
@@ -0,0 +1,121 @@
+Index: linux-2.6.23.1/scripts/gen_initramfs_list.sh
+===================================================================
+--- linux-2.6.23.1.orig/scripts/gen_initramfs_list.sh  2007-11-16 02:26:47.821227881 +0100
++++ linux-2.6.23.1/scripts/gen_initramfs_list.sh       2007-11-16 02:45:42.753904007 +0100
+@@ -287,7 +287,7 @@
+       if [ "${is_cpio_compressed}" = "compressed" ]; then
+               cat ${cpio_tfile} > ${output_file}
+       else
+-              cat ${cpio_tfile} | gzip -f -9 - > ${output_file}
++              lzma e -lc1 -lp2 -pb2 ${cpio_tfile} ${output_file}
+       fi
+       [ -z ${cpio_file} ] && rm ${cpio_tfile}
+ fi
+Index: linux-2.6.23.1/init/initramfs.c
+===================================================================
+--- linux-2.6.23.1.orig/init/initramfs.c       2007-11-16 02:26:47.829228332 +0100
++++ linux-2.6.23.1/init/initramfs.c    2007-11-16 03:03:09.661563882 +0100
+@@ -441,6 +441,69 @@
+       outcnt = 0;
+ }
+ 
++#include <linux/LzmaDecode.h>
++static int __init lzma_unzip(void)
++{
++      unsigned int i;  /* temp value */
++      unsigned int lc; /* literal context bits */
++      unsigned int lp; /* literal pos state bits */
++      unsigned int pb; /* pos state bits */
++      unsigned int osize; /* uncompressed size */
++      unsigned char *workspace;
++      unsigned char* outputbuffer;
++      unsigned int outsizeProcessed = 0;
++      int workspace_size;
++      int res;
++
++      // lzma args
++      i = get_byte();
++      lc = i % 9, i = i / 9;
++      lp = i % 5, pb = i / 5;
++
++      // skip dictionary size
++      for (i = 0; i < 4; i++)
++              get_byte();
++
++      /* read the lower half of uncompressed size in the header */
++      osize = ((unsigned int)get_byte()) +
++              ((unsigned int)get_byte() << 8) +
++              ((unsigned int)get_byte() << 16) +
++              ((unsigned int)get_byte() << 24);
++
++      /* skip rest of the header (upper half of uncompressed size) */
++      for (i = 0; i < 4; i++)
++              get_byte();
++
++      workspace_size = ((LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp))) * sizeof(CProb)) + 100;
++      printk( KERN_NOTICE "initramfs: LZMA lc=%d,lp=%d,pb=%d,origSize=%d\n",
++      lc,lp,pb,osize);
++      outputbuffer = kmalloc(osize, GFP_KERNEL);
++      if (outputbuffer == 0) {
++              printk(KERN_ERR "initramfs: Couldn't allocate lzma output buffer\n");
++              return -1;
++      }
++
++      workspace = kmalloc(workspace_size, GFP_KERNEL);
++      if (workspace == NULL) {
++              printk(KERN_ERR "initramfs: Couldn't allocate lzma workspace\n");
++              return -1;
++      }
++
++      res = LzmaDecode(workspace, workspace_size, lc, lp, pb, inbuf + inptr, insize - inptr, outputbuffer, osize, &outsizeProcessed);
++      if( res != 0 ) {
++              panic( KERN_ERR "initramfs: Lzma decode failure\n");
++              return -1;
++      }
++
++      flush_buffer(outputbuffer, outsizeProcessed);
++      inptr = insize;
++
++      kfree(outputbuffer);
++      kfree(workspace);
++      state = Reset;
++      return 0;
++}
++
+ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
+ {
+       int written;
+@@ -475,12 +538,28 @@
+               inptr = 0;
+               outcnt = 0;             /* bytes in output buffer */
+               bytes_out = 0;
+-              crc = (ulg)0xffffffffL; /* shift register contents */
+-              makecrc();
+-              gunzip();
+-              if (state != Reset)
++              if( inbuf[0] == 037 && ((inbuf[1] == 0213) || (inbuf[1] == 0236)))
++              {
++                 printk( KERN_NOTICE "detected gzip initramfs\n");
++                 crc = (ulg)0xffffffffL; /* shift register contents */
++                 makecrc();
++                 gunzip();
++                 if (state != Reset)
+                       error("junk in gzipped archive");
+-              this_header = saved_offset + inptr;
++              }
++              else if(!memcmp(inbuf+1, "\x00\x00\x80\x00", 4)) /* FIXME: hardcoded dictionary size */
++              {
++                 printk( KERN_NOTICE "detected lzma initramfs\n");
++                 lzma_unzip();
++              }
++              else
++              {
++                 // skip forward ?
++                 crc = (ulg)0xffffffffL; /* shift register contents */
++                 makecrc();
++                 gunzip();
++              }
++              this_header = saved_offset + inptr;
+               buf += inptr;
+               len -= inptr;
+       }