+++ /dev/null
-/*
- * $Id$
- *
- * LZMA compressed kernel decompressor for ADM5120 boards
- *
- * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
- * Copyright (C) 2007 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);
-
-typedef void (*kernel_entry)(unsigned long reg_a0, unsigned long reg_a1,
- unsigned long reg_a2, unsigned long reg_a3);
-
-static int decompress_data(unsigned char *buffer, UInt32 bufferSize,
- int lc, int lp, int pb, unsigned char *outStream, UInt32 outSize,
- UInt32 *outSizeProcessed);
-
-#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(unsigned char *buffer, UInt32 bufferSize,
- int lc, int lp, int pb, unsigned char *outStream, UInt32 outSize,
- UInt32 *outSizeProcessed)
-{
- return LzmaDecode(buffer, bufferSize, lc, lp, pb, data, datalen,
- outStream, outSize, outSizeProcessed);
-}
-#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, unsigned char **buffer, UInt32 *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(unsigned char *buffer, UInt32 bufferSize,
- int lc, int lp, int pb, unsigned char *outStream, UInt32 outSize,
- UInt32 *outSizeProcessed)
-{
- return LzmaDecode(buffer, bufferSize, lc, lp, pb, &lzma_callback,
- outStream, outSize, outSizeProcessed);
-}
-#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 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 */
- int res;
-
- board_init();
-
- printf("\n\nLZMA loader for " CONFIG_BOARD_NAME
- ", Copyright (C) 2007 OpenWrt.org\n\n");
-
- decompress_init();
-
- /* lzma args */
- i = get_byte();
- lc = i % 9, i = i / 9;
- lp = i % 5, pb = i / 5;
-
- /* 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();
-
- printf("decompressing kernel... ");
-
- /* decompress kernel */
- res = decompress_data(workspace, ~0, lc, lp, pb,
- (unsigned char *)LOADADDR, osize, &i);
-
- if (res != LZMA_RESULT_OK) {
- printf("failed, ");
- switch (res) {
- case LZMA_RESULT_DATA_ERROR:
- printf("data error!\n");
- break;
- case LZMA_RESULT_NOT_ENOUGH_MEM:
- printf("not enough memory!\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);
-}
projects / openwrt.git / blobdiff