openwrtv3/target/linux/ar71xx/image/lzma-loader/src/loader.c

265 lines
6.2 KiB
C
Raw Normal View History

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