move target/linux/image to target/image

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

diff --git a/target/image/generic/lzma-loader/src/decompress.c b/target/image/generic/lzma-loader/src/decompress.c
new file mode 100644 (file)
index 0000000..4ed432d
--- /dev/null
+++ b/target/image/generic/lzma-loader/src/decompress.c
@@ -0,0 +1,154 @@
+/*
+ * 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"
+
+#define KSEG0                  0x80000000
+#define KSEG1                  0xa0000000
+
+#define KSEG1ADDR(a)           ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
+
+#define Index_Invalidate_I     0x00
+#define Index_Writeback_Inv_D   0x01
+
+#define cache_unroll(base,op)  \
+       __asm__ __volatile__(           \
+               ".set noreorder;\n"             \
+               ".set mips3;\n"                 \
+               "cache %1, (%0);\n"             \
+               ".set mips0;\n"                 \
+               ".set reorder\n"                \
+               :                                               \
+               : "r" (base),                   \
+                 "i" (op));
+
+
+static __inline__ void blast_icache(unsigned long size, unsigned long lsize)
+{
+       unsigned long start = KSEG0;
+       unsigned long end = (start + size);
+
+       while(start < end) {
+               cache_unroll(start,Index_Invalidate_I);
+               start += lsize;
+       }
+}
+
+static __inline__ void blast_dcache(unsigned long size, unsigned long lsize)
+{
+       unsigned long start = KSEG0;
+       unsigned long end = (start + size);
+
+       while(start < end) {
+               cache_unroll(start,Index_Writeback_Inv_D);
+               start += lsize;
+       }
+}
+
+unsigned char *data;
+
+static int read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize)
+{
+       *bufferSize = 1;
+       *buffer = data;
+       ++data;
+       return LZMA_RESULT_OK;
+}
+
+static __inline__ unsigned char get_byte(void)
+{
+       unsigned char *buffer;
+       UInt32 fake;
+       
+       return read_byte(0, &buffer, &fake), *buffer;
+}
+
+static char *buffer = (char *)0x80C00000;
+extern char lzma_start[];
+extern char lzma_end[];
+
+/* should be the first function */
+void entry(unsigned long icache_size, unsigned long icache_lsize, 
+       unsigned long dcache_size, unsigned long dcache_lsize)
+{
+       unsigned int i;  /* temp value */
+       unsigned int osize; /* uncompressed size */
+       volatile unsigned int arg0, arg1, arg2, arg3;
+
+       /* restore argument registers */
+       __asm__ __volatile__ ("ori %0, $12, 0":"=r"(arg0));
+       __asm__ __volatile__ ("ori %0, $13, 0":"=r"(arg1));
+       __asm__ __volatile__ ("ori %0, $14, 0":"=r"(arg2));
+       __asm__ __volatile__ ("ori %0, $15, 0":"=r"(arg3));
+
+       ILzmaInCallback callback;
+       CLzmaDecoderState vs;
+       callback.Read = read_byte;
+
+       data = lzma_start;
+
+       /* 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 */
+       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();
+
+       /* decompress kernel */
+       if ((i = LzmaDecode(&vs, &callback,
+       (unsigned char*)KERNEL_ENTRY, osize, &osize)) == LZMA_RESULT_OK)
+       {
+               blast_dcache(dcache_size, dcache_lsize);
+               blast_icache(icache_size, icache_lsize);
+
+               /* Jump to load address */
+               ((void (*)(int a0, int a1, int a2, int a3)) KERNEL_ENTRY)(arg0, arg1, arg2, arg3);
+       }
+}