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.
28 #include "LzmaDecode.h"
30 #define AR71XX_FLASH_START 0x1f000000
31 #define AR71XX_FLASH_END 0x1fe00000
33 #define KSEG0 0x80000000
34 #define KSEG1 0xa0000000
36 #define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
41 # define DBG(f, a...) printf(f, ## a)
43 # define DBG(f, a...) do {} while (0)
46 #define IH_MAGIC_OKLI 0x4f4b4c49 /* 'OKLI' */
48 #define IH_NMLEN 32 /* Image Name Length */
50 typedef struct image_header {
51 uint32_t ih_magic; /* Image Header Magic Number */
52 uint32_t ih_hcrc; /* Image Header CRC Checksum */
53 uint32_t ih_time; /* Image Creation Timestamp */
54 uint32_t ih_size; /* Image Data Size */
55 uint32_t ih_load; /* Data Load Address */
56 uint32_t ih_ep; /* Entry Point Address */
57 uint32_t ih_dcrc; /* Image Data CRC Checksum */
58 uint8_t ih_os; /* Operating System */
59 uint8_t ih_arch; /* CPU architecture */
60 uint8_t ih_type; /* Image Type */
61 uint8_t ih_comp; /* Compression Type */
62 uint8_t ih_name[IH_NMLEN]; /* Image Name */
65 /* beyond the image end, size not known in advance */
66 extern unsigned char workspace[];
67 extern void board_init(void);
69 static CLzmaDecoderState lzma_state;
70 static unsigned char *lzma_data;
71 static unsigned long lzma_datasize;
72 static unsigned long lzma_outsize;
73 static unsigned long kernel_la;
75 #ifdef CONFIG_KERNEL_CMDLINE
77 static const char kernel_cmdline[] = CONFIG_KERNEL_CMDLINE;
78 static const char *kernel_argv[] = {
83 #endif /* CONFIG_KERNEL_CMDLINE */
85 static void halt(void)
87 printf("\nSystem halted!\n");
91 static __inline__ unsigned long get_be32(void *buf)
93 unsigned char *p = buf;
95 return (((unsigned long) p[0] << 24) +
96 ((unsigned long) p[1] << 16) +
97 ((unsigned long) p[2] << 8) +
98 (unsigned long) p[3]);
101 static __inline__ unsigned char lzma_get_byte(void)
111 static int lzma_init_props(void)
113 unsigned char props[LZMA_PROPERTIES_SIZE];
117 /* read lzma properties */
118 for (i = 0; i < LZMA_PROPERTIES_SIZE; i++)
119 props[i] = lzma_get_byte();
121 /* read the lower half of uncompressed size in the header */
122 lzma_outsize = ((SizeT) lzma_get_byte()) +
123 ((SizeT) lzma_get_byte() << 8) +
124 ((SizeT) lzma_get_byte() << 16) +
125 ((SizeT) lzma_get_byte() << 24);
127 /* skip rest of the header (upper half of uncompressed size) */
128 for (i = 0; i < 4; i++)
131 res = LzmaDecodeProperties(&lzma_state.Properties, props,
132 LZMA_PROPERTIES_SIZE);
136 static int lzma_decompress(unsigned char *outStream)
141 lzma_state.Probs = (CProb *) workspace;
143 ret = LzmaDecode(&lzma_state, lzma_data, lzma_datasize, &ip, outStream,
146 if (ret != LZMA_RESULT_OK) {
149 DBG("LzmaDecode error %d at %08x, osize:%d ip:%d op:%d\n",
150 ret, lzma_data + ip, lzma_outsize, ip, op);
152 for (i = 0; i < 16; i++)
153 DBG("%02x ", lzma_data[ip + i]);
162 static void lzma_init_data(void)
164 extern unsigned char _lzma_data_start[];
165 extern unsigned char _lzma_data_end[];
167 kernel_la = LOADADDR;
168 lzma_data = _lzma_data_start;
169 lzma_datasize = _lzma_data_end - _lzma_data_start;
172 static void lzma_init_data(void)
174 struct image_header *hdr = NULL;
175 unsigned char *flash_base;
176 unsigned long flash_ofs;
177 unsigned long kernel_ofs;
178 unsigned long kernel_size;
180 flash_base = (unsigned char *) KSEG1ADDR(AR71XX_FLASH_START);
182 printf("Looking for OpenWrt image... ");
184 for (flash_ofs = CONFIG_FLASH_OFFS;
185 flash_ofs <= (CONFIG_FLASH_OFFS + CONFIG_FLASH_MAX);
186 flash_ofs += CONFIG_FLASH_STEP) {
190 p = flash_base + flash_ofs;
192 if (magic == IH_MAGIC_OKLI) {
193 hdr = (struct image_header *) p;
199 printf("not found!\n");
203 printf("found at 0x%08x\n", flash_base + flash_ofs);
205 kernel_ofs = sizeof(struct image_header);
206 kernel_size = get_be32(&hdr->ih_size);
207 kernel_la = get_be32(&hdr->ih_load);
209 lzma_data = flash_base + flash_ofs + kernel_ofs;
210 lzma_datasize = kernel_size;
212 #endif /* (LZMA_WRAPPER) */
214 void loader_main(unsigned long reg_a0, unsigned long reg_a1,
215 unsigned long reg_a2, unsigned long reg_a3)
217 void (*kernel_entry) (unsigned long, unsigned long, unsigned long,
223 printf("\n\nOpenWrt kernel loader for AR7XXX/AR9XXX\n");
224 printf("Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>\n");
228 res = lzma_init_props();
229 if (res != LZMA_RESULT_OK) {
230 printf("Incorrect LZMA stream properties!\n");
234 printf("Decompressing kernel... ");
236 res = lzma_decompress((unsigned char *) kernel_la);
237 if (res != LZMA_RESULT_OK) {
240 case LZMA_RESULT_DATA_ERROR:
241 printf("data error!\n");
244 printf("unknown error %d!\n", res);
251 flush_cache(kernel_la, lzma_outsize);
253 printf("Starting kernel at %08x...\n\n", kernel_la);
255 #ifdef CONFIG_KERNEL_CMDLINE
256 reg_a0 = kernel_argc;
257 reg_a1 = (unsigned long) kernel_argv;
262 kernel_entry = (void *) kernel_la;
263 kernel_entry(reg_a0, reg_a1, reg_a2, reg_a3);