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264 lines
6.2 KiB
C
264 lines
6.2 KiB
C
/*
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* LZMA compressed kernel loader for Atheros AR7XXX/AR9XXX based boards
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*
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* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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*
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* Some parts of this code was based on the OpenWrt specific lzma-loader
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* for the BCM47xx and ADM5120 based boards:
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* Copyright (C) 2004 Manuel Novoa III (mjn3@codepoet.org)
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* Copyright (C) 2005 Mineharu Takahara <mtakahar@yahoo.com>
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* Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
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*
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* The image_header structure has been taken from the U-Boot project.
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* (C) Copyright 2008 Semihalf
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* (C) Copyright 2000-2005
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include "config.h"
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#include "cache.h"
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#include "printf.h"
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#include "LzmaDecode.h"
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#define AR71XX_FLASH_START 0x1f000000
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#define AR71XX_FLASH_END 0x1fe00000
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#define KSEG0 0x80000000
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#define KSEG1 0xa0000000
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#define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
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#undef LZMA_DEBUG
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#ifdef LZMA_DEBUG
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# define DBG(f, a...) printf(f, ## a)
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#else
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# define DBG(f, a...) do {} while (0)
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#endif
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#define IH_MAGIC_OKLI 0x4f4b4c49 /* 'OKLI' */
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#define IH_NMLEN 32 /* Image Name Length */
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typedef struct image_header {
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uint32_t ih_magic; /* Image Header Magic Number */
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uint32_t ih_hcrc; /* Image Header CRC Checksum */
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uint32_t ih_time; /* Image Creation Timestamp */
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uint32_t ih_size; /* Image Data Size */
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uint32_t ih_load; /* Data Load Address */
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uint32_t ih_ep; /* Entry Point Address */
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uint32_t ih_dcrc; /* Image Data CRC Checksum */
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uint8_t ih_os; /* Operating System */
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uint8_t ih_arch; /* CPU architecture */
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uint8_t ih_type; /* Image Type */
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uint8_t ih_comp; /* Compression Type */
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uint8_t ih_name[IH_NMLEN]; /* Image Name */
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} image_header_t;
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/* beyond the image end, size not known in advance */
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extern unsigned char workspace[];
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extern void board_init(void);
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static CLzmaDecoderState lzma_state;
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static unsigned char *lzma_data;
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static unsigned long lzma_datasize;
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static unsigned long lzma_outsize;
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static unsigned long kernel_la;
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#ifdef CONFIG_KERNEL_CMDLINE
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#define kernel_argc 1
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static const char kernel_cmdline[] = CONFIG_KERNEL_CMDLINE;
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static const char *kernel_argv[] = {
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kernel_cmdline,
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NULL,
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};
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#endif /* CONFIG_KERNEL_CMDLINE */
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static void halt(void)
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{
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printf("\nSystem halted!\n");
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for(;;);
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}
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static __inline__ unsigned long get_be32(void *buf)
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{
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unsigned char *p = buf;
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return (((unsigned long) p[0] << 24) +
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((unsigned long) p[1] << 16) +
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((unsigned long) p[2] << 8) +
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(unsigned long) p[3]);
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}
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static __inline__ unsigned char lzma_get_byte(void)
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{
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unsigned char c;
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lzma_datasize--;
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c = *lzma_data++;
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return c;
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}
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static int lzma_init_props(void)
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{
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unsigned char props[LZMA_PROPERTIES_SIZE];
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int res;
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int i;
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/* read lzma properties */
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for (i = 0; i < LZMA_PROPERTIES_SIZE; i++)
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props[i] = lzma_get_byte();
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/* read the lower half of uncompressed size in the header */
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lzma_outsize = ((SizeT) lzma_get_byte()) +
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((SizeT) lzma_get_byte() << 8) +
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((SizeT) lzma_get_byte() << 16) +
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((SizeT) lzma_get_byte() << 24);
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/* skip rest of the header (upper half of uncompressed size) */
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for (i = 0; i < 4; i++)
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lzma_get_byte();
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res = LzmaDecodeProperties(&lzma_state.Properties, props,
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LZMA_PROPERTIES_SIZE);
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return res;
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}
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static int lzma_decompress(unsigned char *outStream)
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{
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SizeT ip, op;
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int ret;
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lzma_state.Probs = (CProb *) workspace;
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ret = LzmaDecode(&lzma_state, lzma_data, lzma_datasize, &ip, outStream,
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lzma_outsize, &op);
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if (ret != LZMA_RESULT_OK) {
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int i;
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DBG("LzmaDecode error %d at %08x, osize:%d ip:%d op:%d\n",
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ret, lzma_data + ip, lzma_outsize, ip, op);
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for (i = 0; i < 16; i++)
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DBG("%02x ", lzma_data[ip + i]);
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DBG("\n");
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}
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return ret;
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}
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#if (LZMA_WRAPPER)
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static void lzma_init_data(void)
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{
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extern unsigned char _lzma_data_start[];
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extern unsigned char _lzma_data_end[];
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kernel_la = LOADADDR;
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lzma_data = _lzma_data_start;
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lzma_datasize = _lzma_data_end - _lzma_data_start;
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}
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#else
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static void lzma_init_data(void)
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{
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struct image_header *hdr = NULL;
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unsigned char *flash_base;
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unsigned long flash_ofs;
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unsigned long kernel_ofs;
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unsigned long kernel_size;
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flash_base = (unsigned char *) KSEG1ADDR(AR71XX_FLASH_START);
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printf("Looking for OpenWrt image... ");
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for (flash_ofs = CONFIG_FLASH_OFFS;
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flash_ofs <= (CONFIG_FLASH_OFFS + CONFIG_FLASH_MAX);
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flash_ofs += CONFIG_FLASH_STEP) {
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unsigned long magic;
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unsigned char *p;
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p = flash_base + flash_ofs;
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magic = get_be32(p);
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if (magic == IH_MAGIC_OKLI) {
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hdr = (struct image_header *) p;
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break;
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}
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}
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if (hdr == NULL) {
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printf("not found!\n");
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halt();
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}
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printf("found at 0x%08x\n", flash_base + flash_ofs);
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kernel_ofs = sizeof(struct image_header);
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kernel_size = get_be32(&hdr->ih_size);
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kernel_la = get_be32(&hdr->ih_load);
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lzma_data = flash_base + flash_ofs + kernel_ofs;
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lzma_datasize = kernel_size;
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}
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#endif /* (LZMA_WRAPPER) */
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void loader_main(unsigned long reg_a0, unsigned long reg_a1,
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unsigned long reg_a2, unsigned long reg_a3)
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{
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void (*kernel_entry) (unsigned long, unsigned long, unsigned long,
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unsigned long);
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int res;
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board_init();
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printf("\n\nOpenWrt kernel loader for MIPS based SoC\n");
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printf("Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>\n");
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lzma_init_data();
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res = lzma_init_props();
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if (res != LZMA_RESULT_OK) {
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printf("Incorrect LZMA stream properties!\n");
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halt();
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}
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printf("Decompressing kernel... ");
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res = lzma_decompress((unsigned char *) kernel_la);
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if (res != LZMA_RESULT_OK) {
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printf("failed, ");
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switch (res) {
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case LZMA_RESULT_DATA_ERROR:
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printf("data error!\n");
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break;
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default:
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printf("unknown error %d!\n", res);
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}
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halt();
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} else {
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printf("done!\n");
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}
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flush_cache(kernel_la, lzma_outsize);
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printf("Starting kernel at %08x...\n\n", kernel_la);
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#ifdef CONFIG_KERNEL_CMDLINE
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reg_a0 = kernel_argc;
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reg_a1 = (unsigned long) kernel_argv;
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reg_a2 = 0;
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reg_a3 = 0;
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#endif
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kernel_entry = (void *) kernel_la;
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kernel_entry(reg_a0, reg_a1, reg_a2, reg_a3);
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}
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