X-Git-Url: https://git.archive.openwrt.org/?p=openwrt.git;a=blobdiff_plain;f=target%2Fimage%2Fgeneric%2Flzma-loader%2Fsrc%2Fdecompress.c;fp=target%2Fimage%2Fgeneric%2Flzma-loader%2Fsrc%2Fdecompress.c;h=4ed432d1a502a62883b9f141b26fd199f6b1f221;hp=0000000000000000000000000000000000000000;hb=a8de4fb9f24fea095e80a3fcd5c69bd6029e39d2;hpb=b0107120a73002d99673d1ce0ea22dc9c646472e

diff --git a/target/image/generic/lzma-loader/src/decompress.c b/target/image/generic/lzma-loader/src/decompress.c
new file mode 100644
index 0000000000..4ed432d1a5
--- /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);
+	}
+}