OpenWrt – Blame information for rev 4

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4 office 1 /*
2 * LZMA compressed kernel loader for Atheros AR7XXX/AR9XXX based boards
3 *
4 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
5 *
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>
11 *
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.
16 *
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.
20 */
21  
22 #include <stddef.h>
23 #include <stdint.h>
24  
25 #include "config.h"
26 #include "cache.h"
27 #include "printf.h"
28 #include "LzmaDecode.h"
29  
30 #define AR71XX_FLASH_START 0x1f000000
31 #define AR71XX_FLASH_END 0x1fe00000
32  
33 #define KSEG0 0x80000000
34 #define KSEG1 0xa0000000
35  
36 #define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
37  
38 #undef LZMA_DEBUG
39  
40 #ifdef LZMA_DEBUG
41 # define DBG(f, a...) printf(f, ## a)
42 #else
43 # define DBG(f, a...) do {} while (0)
44 #endif
45  
46 #define IH_MAGIC_OKLI 0x4f4b4c49 /* 'OKLI' */
47  
48 #define IH_NMLEN 32 /* Image Name Length */
49  
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 */
63 } image_header_t;
64  
65 /* beyond the image end, size not known in advance */
66 extern unsigned char workspace[];
67 extern void board_init(void);
68  
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;
74  
75 #ifdef CONFIG_KERNEL_CMDLINE
76 #define kernel_argc 2
77 static const char kernel_cmdline[] = CONFIG_KERNEL_CMDLINE;
78 static const char *const kernel_argv[] = {
79 NULL,
80 kernel_cmdline,
81 NULL,
82 };
83 #endif /* CONFIG_KERNEL_CMDLINE */
84  
85 static void halt(void)
86 {
87 printf("\nSystem halted!\n");
88 for(;;);
89 }
90  
91 static __inline__ unsigned long get_be32(void *buf)
92 {
93 unsigned char *p = buf;
94  
95 return (((unsigned long) p[0] << 24) +
96 ((unsigned long) p[1] << 16) +
97 ((unsigned long) p[2] << 8) +
98 (unsigned long) p[3]);
99 }
100  
101 static __inline__ unsigned char lzma_get_byte(void)
102 {
103 unsigned char c;
104  
105 lzma_datasize--;
106 c = *lzma_data++;
107  
108 return c;
109 }
110  
111 static int lzma_init_props(void)
112 {
113 unsigned char props[LZMA_PROPERTIES_SIZE];
114 int res;
115 int i;
116  
117 /* read lzma properties */
118 for (i = 0; i < LZMA_PROPERTIES_SIZE; i++)
119 props[i] = lzma_get_byte();
120  
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);
126  
127 /* skip rest of the header (upper half of uncompressed size) */
128 for (i = 0; i < 4; i++)
129 lzma_get_byte();
130  
131 res = LzmaDecodeProperties(&lzma_state.Properties, props,
132 LZMA_PROPERTIES_SIZE);
133 return res;
134 }
135  
136 static int lzma_decompress(unsigned char *outStream)
137 {
138 SizeT ip, op;
139 int ret;
140  
141 lzma_state.Probs = (CProb *) workspace;
142  
143 ret = LzmaDecode(&lzma_state, lzma_data, lzma_datasize, &ip, outStream,
144 lzma_outsize, &op);
145  
146 if (ret != LZMA_RESULT_OK) {
147 int i;
148  
149 DBG("LzmaDecode error %d at %08x, osize:%d ip:%d op:%d\n",
150 ret, lzma_data + ip, lzma_outsize, ip, op);
151  
152 for (i = 0; i < 16; i++)
153 DBG("%02x ", lzma_data[ip + i]);
154  
155 DBG("\n");
156 }
157  
158 return ret;
159 }
160  
161 #if (LZMA_WRAPPER)
162 static void lzma_init_data(void)
163 {
164 extern unsigned char _lzma_data_start[];
165 extern unsigned char _lzma_data_end[];
166  
167 kernel_la = LOADADDR;
168 lzma_data = _lzma_data_start;
169 lzma_datasize = _lzma_data_end - _lzma_data_start;
170 }
171 #else
172 static void lzma_init_data(void)
173 {
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;
179  
180 flash_base = (unsigned char *) KSEG1ADDR(AR71XX_FLASH_START);
181  
182 printf("Looking for OpenWrt image... ");
183  
184 for (flash_ofs = CONFIG_FLASH_OFFS;
185 flash_ofs <= (CONFIG_FLASH_OFFS + CONFIG_FLASH_MAX);
186 flash_ofs += CONFIG_FLASH_STEP) {
187 unsigned long magic;
188 unsigned char *p;
189  
190 p = flash_base + flash_ofs;
191 magic = get_be32(p);
192 if (magic == IH_MAGIC_OKLI) {
193 hdr = (struct image_header *) p;
194 break;
195 }
196 }
197  
198 if (hdr == NULL) {
199 printf("not found!\n");
200 halt();
201 }
202  
203 printf("found at 0x%08x\n", flash_base + flash_ofs);
204  
205 kernel_ofs = sizeof(struct image_header);
206 kernel_size = get_be32(&hdr->ih_size);
207 kernel_la = get_be32(&hdr->ih_load);
208  
209 lzma_data = flash_base + flash_ofs + kernel_ofs;
210 lzma_datasize = kernel_size;
211 }
212 #endif /* (LZMA_WRAPPER) */
213  
214 void loader_main(unsigned long reg_a0, unsigned long reg_a1,
215 unsigned long reg_a2, unsigned long reg_a3)
216 {
217 void (*kernel_entry) (unsigned long, unsigned long, unsigned long,
218 unsigned long);
219 int res;
220  
221 board_init();
222  
223 printf("\n\nOpenWrt kernel loader for AR7XXX/AR9XXX\n");
224 printf("Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>\n");
225  
226 lzma_init_data();
227  
228 res = lzma_init_props();
229 if (res != LZMA_RESULT_OK) {
230 printf("Incorrect LZMA stream properties!\n");
231 halt();
232 }
233  
234 printf("Decompressing kernel... ");
235  
236 res = lzma_decompress((unsigned char *) kernel_la);
237 if (res != LZMA_RESULT_OK) {
238 printf("failed, ");
239 switch (res) {
240 case LZMA_RESULT_DATA_ERROR:
241 printf("data error!\n");
242 break;
243 default:
244 printf("unknown error %d!\n", res);
245 }
246 halt();
247 } else {
248 printf("done!\n");
249 }
250  
251 flush_cache(kernel_la, lzma_outsize);
252  
253 printf("Starting kernel at %08x...\n\n", kernel_la);
254  
255 #ifdef CONFIG_KERNEL_CMDLINE
256 reg_a0 = kernel_argc;
257 reg_a1 = (unsigned long) kernel_argv;
258 reg_a2 = 0;
259 reg_a3 = 0;
260 #endif
261  
262 kernel_entry = (void *) kernel_la;
263 kernel_entry(reg_a0, reg_a1, reg_a2, reg_a3);
264 }