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authorJames <>2015-11-04 11:49:21 +0000
committerJames <>2015-11-04 11:49:21 +0000
commit716ca530e1c4515d8683c9d5be3d56b301758b66 (patch)
tree700eb5bcc1a462a5f21dcec15ce7c97ecfefa772 /target/linux/adm5120/image/lzma-loader/src/decompress.c
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Diffstat (limited to 'target/linux/adm5120/image/lzma-loader/src/decompress.c')
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diff --git a/target/linux/adm5120/image/lzma-loader/src/decompress.c b/target/linux/adm5120/image/lzma-loader/src/decompress.c
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+++ b/target/linux/adm5120/image/lzma-loader/src/decompress.c
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+/*
+ *
+ * LZMA compressed kernel decompressor for ADM5120 boards
+ *
+ * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
+ * Copyright (C) 2007-2008 OpenWrt.org
+ * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * 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
+ *
+ * 24-Mar-2007 Gabor Juhos
+ * pass original values of the a0,a1,a2,a3 registers to the kernel
+ *
+ * 19-May-2007 Gabor Juhos
+ * endiannes related cleanups
+ * add support for decompressing an embedded kernel
+ *
+ */
+
+#include <stddef.h>
+
+#include "config.h"
+#include "printf.h"
+#include "LzmaDecode.h"
+
+#define ADM5120_FLASH_START 0x1fc00000 /* Flash start */
+#define ADM5120_FLASH_END 0x1fe00000 /* Flash end */
+
+#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));
+
+#ifdef LZMA_DEBUG
+# define DBG(f, a...) printf(f, ## a)
+#else
+# define DBG(f, a...) do {} while (0)
+#endif
+
+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;
+ }
+}
+
+#define TRX_MAGIC 0x30524448 /* "HDR0" */
+#define TRX_ALIGN 0x1000
+
+struct trx_header {
+ unsigned int magic; /* "HDR0" */
+ unsigned int len; /* Length of file including header */
+ unsigned int crc32; /* 32-bit CRC from flag_version to end of file */
+ unsigned int flag_version; /* 0:15 flags, 16:31 version */
+ unsigned int offsets[3]; /* Offsets of partitions from start of header */
+};
+
+struct env_var {
+ char *name;
+ char *value;
+};
+
+/* beyound the image end, size not known in advance */
+extern unsigned char workspace[];
+extern void board_init(void);
+
+static CLzmaDecoderState lzma_state;
+
+typedef void (*kernel_entry)(unsigned long reg_a0, unsigned long reg_a1,
+ unsigned long reg_a2, unsigned long reg_a3);
+
+static int decompress_data(CLzmaDecoderState *vs, unsigned char *outStream,
+ UInt32 outSize);
+
+#ifdef CONFIG_PASS_KARGS
+#define ENVV(n,v) {.name = (n), .value = (v)}
+struct env_var env_vars[] = {
+ ENVV("board_name", CONFIG_BOARD_NAME),
+ ENVV(NULL, NULL)
+};
+#endif
+
+static void halt(void)
+{
+ printf("\nSystem halted!\n");
+ for(;;);
+}
+
+#if (LZMA_WRAPPER)
+extern unsigned char _lzma_data_start[];
+extern unsigned char _lzma_data_end[];
+
+unsigned char *data;
+unsigned long datalen;
+
+static __inline__ unsigned char get_byte(void)
+{
+ datalen--;
+ return *data++;
+}
+
+static void decompress_init(void)
+{
+ data = _lzma_data_start;
+ datalen = _lzma_data_end - _lzma_data_start;
+}
+
+static int decompress_data(CLzmaDecoderState *vs, unsigned char *outStream,
+ SizeT outSize)
+{
+ SizeT ip, op;
+
+ return LzmaDecode(vs, data, datalen, &ip, outStream, outSize, &op);
+}
+#endif /* LZMA_WRAPPER */
+
+#if !(LZMA_WRAPPER)
+
+#define FLASH_BANK_SIZE (2<<20)
+
+static unsigned char *flash_base = (unsigned char *) KSEG1ADDR(ADM5120_FLASH_START);
+static unsigned long flash_ofs = 0;
+static unsigned long flash_max = 0;
+static unsigned long flash_ofs_mask = (FLASH_BANK_SIZE-1);
+
+static __inline__ unsigned char get_byte(void)
+{
+ return *(flash_base+flash_ofs++);
+}
+
+static int lzma_read_byte(void *object, const unsigned char **buffer,
+ SizeT *bufferSize)
+{
+ unsigned long len;
+
+ if (flash_ofs >= flash_max)
+ return LZMA_RESULT_DATA_ERROR;
+
+ len = flash_max-flash_ofs;
+
+#if (CONFIG_FLASH_SIZE > FLASH_BANK_SIZE)
+ if (flash_ofs < FLASH_BANK_SIZE) {
+ /* switch to bank 0 */
+ DBG("lzma_read_byte: switch to bank 0\n");
+
+ if (len > FLASH_BANK_SIZE-flash_ofs)
+ len = FLASH_BANK_SIZE-flash_ofs;
+ } else {
+ /* switch to bank 1 */
+ DBG("lzma_read_byte: switch to bank 1\n");
+ }
+#endif
+ DBG("lzma_read_byte: ofs=%08X, len=%08X\n", flash_ofs, len);
+
+ *buffer = flash_base+(flash_ofs & flash_ofs_mask);
+ *bufferSize = len;
+ flash_ofs += len;
+
+ return LZMA_RESULT_OK;
+}
+
+static ILzmaInCallback lzma_callback = {
+ .Read = lzma_read_byte,
+};
+
+static __inline__ unsigned int read_le32(void *buf)
+{
+ unsigned char *p = buf;
+
+ return ((unsigned int)p[0] + ((unsigned int)p[1] << 8) +
+ ((unsigned int)p[2] << 16) +((unsigned int)p[3] << 24));
+}
+
+static void decompress_init(void)
+{
+ struct trx_header *hdr = NULL;
+ unsigned long kofs,klen;
+
+ printf("Looking for TRX header... ");
+ /* look for trx header, 32-bit data access */
+ for (flash_ofs = 0; flash_ofs < FLASH_BANK_SIZE; flash_ofs += TRX_ALIGN) {
+ if (read_le32(&flash_base[flash_ofs]) == TRX_MAGIC) {
+ hdr = (struct trx_header *)&flash_base[flash_ofs];
+ break;
+ }
+ }
+
+ if (hdr == NULL) {
+ printf("not found!\n");
+ /* no compressed kernel found, halting */
+ halt();
+ }
+
+ /* compressed kernel is in the partition 0 or 1 */
+ kofs = read_le32(&hdr->offsets[1]);
+ if (kofs == 0 || kofs > 65536) {
+ klen = kofs-read_le32(&hdr->offsets[0]);
+ kofs = read_le32(&hdr->offsets[0]);
+ } else {
+ klen = read_le32(&hdr->offsets[2]);
+ if (klen > kofs)
+ klen -= kofs;
+ else
+ klen = read_le32(&hdr->len)-kofs;
+ }
+
+ printf("found at %08X, kernel:%08X len:%08X\n", flash_ofs,
+ kofs, klen);
+
+ flash_ofs += kofs;
+ flash_max = flash_ofs+klen;
+}
+
+static int decompress_data(CLzmaDecoderState *vs, unsigned char *outStream,
+ SizeT outSize)
+{
+ SizeT op;
+
+#if 0
+ vs->Buffer = data;
+ vs->BufferLim = datalen;
+#endif
+
+ return LzmaDecode(vs, &lzma_callback, outStream, outSize, &op);
+}
+#endif /* !(LZMA_WRAPPER) */
+
+/* should be the first function */
+void decompress_entry(unsigned long reg_a0, unsigned long reg_a1,
+ unsigned long reg_a2, unsigned long reg_a3,
+ unsigned long icache_size, unsigned long icache_lsize,
+ unsigned long dcache_size, unsigned long dcache_lsize)
+{
+ unsigned char props[LZMA_PROPERTIES_SIZE];
+ unsigned int i; /* temp value */
+ SizeT osize; /* uncompressed size */
+ int res;
+
+ board_init();
+
+ printf("\n\nLZMA loader for " CONFIG_BOARD_NAME
+ ", Copyright (C) 2007-2008 OpenWrt.org\n\n");
+
+ decompress_init();
+
+ /* lzma args */
+ for (i = 0; i < LZMA_PROPERTIES_SIZE; i++)
+ props[i] = get_byte();
+
+ /* skip rest of the LZMA coder property */
+ /* read the lower half of uncompressed size in the header */
+ osize = ((SizeT)get_byte()) +
+ ((SizeT)get_byte() << 8) +
+ ((SizeT)get_byte() << 16) +
+ ((SizeT)get_byte() << 24);
+
+ /* skip rest of the header (upper half of uncompressed size) */
+ for (i = 0; i < 4; i++)
+ get_byte();
+
+ res = LzmaDecodeProperties(&lzma_state.Properties, props,
+ LZMA_PROPERTIES_SIZE);
+ if (res != LZMA_RESULT_OK) {
+ printf("Incorrect LZMA stream properties!\n");
+ halt();
+ }
+
+ printf("decompressing kernel... ");
+
+ lzma_state.Probs = (CProb *)workspace;
+ res = decompress_data(&lzma_state, (unsigned char *)LOADADDR, osize);
+
+ if (res != LZMA_RESULT_OK) {
+ printf("failed, ");
+ switch (res) {
+ case LZMA_RESULT_DATA_ERROR:
+ printf("data error!\n");
+ break;
+ default:
+ printf("unknown error %d!\n", res);
+ }
+ halt();
+ } else
+ printf("done!\n");
+
+ blast_dcache(dcache_size, dcache_lsize);
+ blast_icache(icache_size, icache_lsize);
+
+ printf("launching kernel...\n\n");
+
+#ifdef CONFIG_PASS_KARGS
+ reg_a0 = 0;
+ reg_a1 = 0;
+ reg_a2 = (unsigned long)env_vars;
+ reg_a3 = 0;
+#endif
+ /* Jump to load address */
+ ((kernel_entry) LOADADDR)(reg_a0, reg_a1, reg_a2, reg_a3);
+}