Merge branch 'adm8668'

[openwrt.git] / target / linux / adm8668 / image / lzma-loader / src / decompress.c

diff --git a/target/linux/adm8668/image/lzma-loader/src/decompress.c b/target/linux/adm8668/image/lzma-loader/src/decompress.c
new file mode 100644 (file)
index 0000000..f328058
--- /dev/null
+++ b/target/linux/adm8668/image/lzma-loader/src/decompress.c
@@ -0,0 +1,118 @@
+/*
+ * LZMA compressed kernel decompressor for bcm947xx boards
+ *
+ * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *
+ * Please note, this was code based on the bunzip2 decompressor code
+ * by Manuel Novoa III  (mjn3@codepoet.org), although the only thing left
+ * is an idea and part of original vendor code
+ *
+ *
+ * 12-Mar-2005  Mineharu Takahara <mtakahar@yahoo.com>
+ *   pass actual output size to decoder (stream mode
+ *   compressed input is not a requirement anymore)
+ *
+ * 24-Apr-2005 Oleg I. Vdovikin
+ *   reordered functions using lds script, removed forward decl
+ *
+ * ??-Nov-2005 Mike Baker
+ *   reorder the script as an lzma wrapper; do not depend on flash access
+ */
+
+#include "LzmaDecode.h"
+#include <exports.h>
+
+#define        KSEG0ADDR(addr) (0x80000000|addr)
+
+register volatile gd_t *gd asm ("k0");
+unsigned char *data;
+
+static __inline__ unsigned char get_byte()
+{
+       unsigned char *buffer;
+
+       buffer = data;
+       data++;
+
+       return *buffer;
+}
+
+/* This puts lzma workspace 128k below RAM end.
+ * That should be enough for both lzma and stack
+ */
+static char *buffer = (char *)(RAMSTART + RAMSIZE - 0x00020000);
+extern char _binary_vmlinux_lzma_start[];
+extern char _binary_vmlinux_lzma_end[];
+extern char lzma_start[];
+extern char lzma_end[];
+
+/* should be the first function */
+void entry(unsigned int arg0, unsigned int arg1,
+       unsigned int arg2, unsigned int arg3)
+{
+       unsigned int i;  /* temp value */
+       unsigned int isize; /* compressed size */
+       unsigned int osize; /* uncompressed size */
+       int argc = arg0;
+       char **argv = (char **)arg1;
+       char **envp = (char **)arg2;
+
+       CLzmaDecoderState vs;
+
+       data = (unsigned char *)_binary_vmlinux_lzma_start;
+       isize = _binary_vmlinux_lzma_end - _binary_vmlinux_lzma_start + 1;
+
+       puts("\nLZMA kernel loader\n");
+
+       printf("lzma data @ %#x - %#x\n", _binary_vmlinux_lzma_start, _binary_vmlinux_lzma_end);
+       printf("load addr @ %#x\n\n", KERNEL_ENTRY);
+       printf("jump table @ %#x\n", gd->jt[3]);
+
+       /* lzma args */
+       i = get_byte();
+       vs.Properties.lc = i % 9, i = i / 9;
+       vs.Properties.lp = i % 5, vs.Properties.pb = i / 5;
+
+       vs.Probs = (CProb *)buffer;
+
+       /* skip rest of the LZMA coder property */
+       data += 4;
+
+       /* 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) */
+       data += 4;
+
+       /* decompress kernel */
+       puts("\nDecompressing kernel...");
+       if ((i = LzmaDecode(&vs,
+       (unsigned char*)data, isize, &isize,
+       (unsigned char*)KERNEL_ENTRY, osize, &osize)) == LZMA_RESULT_OK)
+       {
+               puts("success!\n");
+
+               /* Jump to load address */
+//             ((void (*)(int a0, int a1, int a2, int a3))KERNEL_ENTRY)(0,0,0,0);
+               ((void (*)(int a0, int a1, int a2, int a3))KERNEL_ENTRY)(arg0, arg1, arg2, arg3);
+       }
+       puts("failure!\n");
+}