2 * LZMA compressed kernel loader for Atheros AR7XXX/AR9XXX based boards
4 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
6 * Some parts of this code was based on the OpenWrt specific lzma-loader
7 * for the BCM47xx and ADM5120 based boards:
8 * Copyright (C) 2004 Manuel Novoa III (mjn3@codepoet.org)
9 * Copyright (C) 2005 Mineharu Takahara <mtakahar@yahoo.com>
10 * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
12 * The image_header structure has been taken from the U-Boot project.
13 * (C) Copyright 2008 Semihalf
14 * (C) Copyright 2000-2005
15 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
17 * This program is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License version 2 as published
19 * by the Free Software Foundation.
24 #include <sys/types.h>
29 #include "LzmaDecode.h"
31 #define AR71XX_FLASH_START 0x1f000000
32 #define AR71XX_FLASH_END 0x1fe00000
34 #define KSEG0 0x80000000
35 #define KSEG1 0xa0000000
37 #define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
42 # define DBG(f, a...) printf(f, ## a)
44 # define DBG(f, a...) do {} while (0)
47 #define IH_MAGIC_OKLI 0x4f4b4c49 /* 'OKLI' */
49 #define IH_NMLEN 32 /* Image Name Length */
51 typedef struct image_header {
52 uint32_t ih_magic; /* Image Header Magic Number */
53 uint32_t ih_hcrc; /* Image Header CRC Checksum */
54 uint32_t ih_time; /* Image Creation Timestamp */
55 uint32_t ih_size; /* Image Data Size */
56 uint32_t ih_load; /* Data Load Address */
57 uint32_t ih_ep; /* Entry Point Address */
58 uint32_t ih_dcrc; /* Image Data CRC Checksum */
59 uint8_t ih_os; /* Operating System */
60 uint8_t ih_arch; /* CPU architecture */
61 uint8_t ih_type; /* Image Type */
62 uint8_t ih_comp; /* Compression Type */
63 uint8_t ih_name[IH_NMLEN]; /* Image Name */
66 /* beyond the image end, size not known in advance */
67 extern unsigned char workspace[];
68 extern void board_init(void);
70 static CLzmaDecoderState lzma_state;
71 static unsigned char *lzma_data;
72 static unsigned long lzma_datasize;
73 static unsigned long lzma_outsize;
74 static unsigned long kernel_la;
76 #ifdef CONFIG_KERNEL_CMDLINE
78 static const char kernel_cmdline[] = CONFIG_KERNEL_CMDLINE;
79 static const char *kernel_argv[] = {
84 #endif /* CONFIG_KERNEL_CMDLINE */
86 static void halt(void)
88 printf("\nSystem halted!\n");
92 static __inline__ unsigned long get_be32(void *buf)
94 unsigned char *p = buf;
96 return (((unsigned long) p[0] << 24) +
97 ((unsigned long) p[1] << 16) +
98 ((unsigned long) p[2] << 8) +
99 (unsigned long) p[3]);
102 static __inline__ unsigned char lzma_get_byte(void)
112 static int lzma_init_props(void)
114 unsigned char props[LZMA_PROPERTIES_SIZE];
118 /* read lzma properties */
119 for (i = 0; i < LZMA_PROPERTIES_SIZE; i++)
120 props[i] = lzma_get_byte();
122 /* read the lower half of uncompressed size in the header */
123 lzma_outsize = ((SizeT) lzma_get_byte()) +
124 ((SizeT) lzma_get_byte() << 8) +
125 ((SizeT) lzma_get_byte() << 16) +
126 ((SizeT) lzma_get_byte() << 24);
128 /* skip rest of the header (upper half of uncompressed size) */
129 for (i = 0; i < 4; i++)
132 res = LzmaDecodeProperties(&lzma_state.Properties, props,
133 LZMA_PROPERTIES_SIZE);
137 static int lzma_decompress(unsigned char *outStream)
142 lzma_state.Probs = (CProb *) workspace;
144 ret = LzmaDecode(&lzma_state, lzma_data, lzma_datasize, &ip, outStream,
147 if (ret != LZMA_RESULT_OK) {
150 DBG("LzmaDecode error %d at %08x, osize:%d ip:%d op:%d\n",
151 ret, lzma_data + ip, lzma_outsize, ip, op);
153 for (i = 0; i < 16; i++)
154 DBG("%02x ", lzma_data[ip + i]);
163 static void lzma_init_data(void)
165 extern unsigned char _lzma_data_start[];
166 extern unsigned char _lzma_data_end[];
168 kernel_la = LOADADDR;
169 lzma_data = _lzma_data_start;
170 lzma_datasize = _lzma_data_end - _lzma_data_start;
173 static void lzma_init_data(void)
175 struct image_header *hdr = NULL;
176 unsigned char *flash_base;
177 unsigned long flash_ofs;
178 unsigned long kernel_ofs;
179 unsigned long kernel_size;
181 flash_base = (unsigned char *) KSEG1ADDR(AR71XX_FLASH_START);
183 printf("Looking for OpenWrt image... ");
185 for (flash_ofs = CONFIG_FLASH_OFFS;
186 flash_ofs <= (CONFIG_FLASH_OFFS + CONFIG_FLASH_MAX);
187 flash_ofs += CONFIG_FLASH_STEP) {
191 p = flash_base + flash_ofs;
193 if (magic == IH_MAGIC_OKLI) {
194 hdr = (struct image_header *) p;
200 printf("not found!\n");
204 printf("found at 0x%08x\n", flash_base + flash_ofs);
206 kernel_ofs = sizeof(struct image_header);
207 kernel_size = get_be32(&hdr->ih_size);
208 kernel_la = get_be32(&hdr->ih_load);
210 lzma_data = flash_base + flash_ofs + kernel_ofs;
211 lzma_datasize = kernel_size;
213 #endif /* (LZMA_WRAPPER) */
215 void loader_main(unsigned long reg_a0, unsigned long reg_a1,
216 unsigned long reg_a2, unsigned long reg_a3)
218 void (*kernel_entry) (unsigned long, unsigned long, unsigned long,
224 printf("\n\nOpenWrt kernel loader for MIPS based SoC\n");
225 printf("Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>\n");
229 res = lzma_init_props();
230 if (res != LZMA_RESULT_OK) {
231 printf("Incorrect LZMA stream properties!\n");
235 printf("Decompressing kernel... ");
237 res = lzma_decompress((unsigned char *) kernel_la);
238 if (res != LZMA_RESULT_OK) {
241 case LZMA_RESULT_DATA_ERROR:
242 printf("data error!\n");
245 printf("unknown error %d!\n", res);
252 flush_cache(kernel_la, lzma_outsize);
254 printf("Starting kernel at %08x...\n\n", kernel_la);
256 #ifdef CONFIG_KERNEL_CMDLINE
257 reg_a0 = kernel_argc;
258 reg_a1 = (unsigned long) kernel_argv;
263 kernel_entry = (void *) kernel_la;
264 kernel_entry(reg_a0, reg_a1, reg_a2, reg_a3);