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1 /*
2 * Copyright (c) 2001 William L. Pitts
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are freely
6 * permitted provided that the above copyright notice and this
7 * paragraph and the following disclaimer are duplicated in all
8 * such forms.
9 *
10 * This software is provided "AS IS" and without any express or
11 * implied warranties, including, without limitation, the implied
12 * warranties of merchantability and fitness for a particular
13 * purpose.
14 */
15
16 #include <common.h>
17 #include <bootm.h>
18 #include <command.h>
19 #include <linux/ctype.h>
20 #include <net.h>
21 #include <elf.h>
22 #include <vxworks.h>
23
24 #if defined(CONFIG_WALNUT) || defined(CONFIG_SYS_VXWORKS_MAC_PTR)
25 DECLARE_GLOBAL_DATA_PTR;
26 #endif
27
28 static unsigned long load_elf_image_phdr(unsigned long addr);
29 static unsigned long load_elf_image_shdr(unsigned long addr);
30
31 /* Allow ports to override the default behavior */
32 static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
33 int argc, char * const argv[])
34 {
35 unsigned long ret;
36
37 /*
38 * QNX images require the data cache is disabled.
39 * Data cache is already flushed, so just turn it off.
40 */
41 int dcache = dcache_status();
42 if (dcache)
43 dcache_disable();
44
45 /*
46 * pass address parameter as argv[0] (aka command name),
47 * and all remaining args
48 */
49 ret = entry(argc, argv);
50
51 if (dcache)
52 dcache_enable();
53
54 return ret;
55 }
56
57 /* ======================================================================
58 * Determine if a valid ELF image exists at the given memory location.
59 * First looks at the ELF header magic field, the makes sure that it is
60 * executable and makes sure that it is for a PowerPC.
61 * ====================================================================== */
62 int valid_elf_image(unsigned long addr)
63 {
64 Elf32_Ehdr *ehdr; /* Elf header structure pointer */
65
66 /* -------------------------------------------------- */
67
68 ehdr = (Elf32_Ehdr *) addr;
69
70 if (!IS_ELF(*ehdr)) {
71 printf("## No elf image at address 0x%08lx\n", addr);
72 return 0;
73 }
74
75 if (ehdr->e_type != ET_EXEC) {
76 printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
77 return 0;
78 }
79
80 #if 0
81 if (ehdr->e_machine != EM_PPC) {
82 printf("## Not a PowerPC elf image at address 0x%08lx\n", addr);
83 return 0;
84 }
85 #endif
86
87 return 1;
88 }
89
90 /* ======================================================================
91 * Interpreter command to boot an arbitrary ELF image from memory.
92 * ====================================================================== */
93 int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
94 {
95 unsigned long addr; /* Address of the ELF image */
96 unsigned long rc; /* Return value from user code */
97 char *sload, *saddr;
98 const char *ep = getenv("autostart");
99
100 /* -------------------------------------------------- */
101 int rcode = 0;
102
103 sload = saddr = NULL;
104 if (argc == 3) {
105 sload = argv[1];
106 saddr = argv[2];
107 } else if (argc == 2) {
108 if (argv[1][0] == '-')
109 sload = argv[1];
110 else
111 saddr = argv[1];
112 }
113
114 if (saddr)
115 addr = simple_strtoul(saddr, NULL, 16);
116 else
117 addr = load_addr;
118
119 if (!valid_elf_image(addr))
120 return 1;
121
122 if (sload && sload[1] == 'p')
123 addr = load_elf_image_phdr(addr);
124 else
125 addr = load_elf_image_shdr(addr);
126
127 if (ep && !strcmp(ep, "no"))
128 return rcode;
129
130 printf("## Starting application at 0x%08lx ...\n", addr);
131
132 /*
133 * pass address parameter as argv[0] (aka command name),
134 * and all remaining args
135 */
136 rc = do_bootelf_exec((void *)addr, argc - 1, argv + 1);
137 if (rc != 0)
138 rcode = 1;
139
140 printf("## Application terminated, rc = 0x%lx\n", rc);
141 return rcode;
142 }
143
144 /* ======================================================================
145 * Interpreter command to boot VxWorks from a memory image. The image can
146 * be either an ELF image or a raw binary. Will attempt to setup the
147 * bootline and other parameters correctly.
148 * ====================================================================== */
149 int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
150 {
151 unsigned long addr; /* Address of image */
152 unsigned long bootaddr; /* Address to put the bootline */
153 char *bootline; /* Text of the bootline */
154 char *tmp; /* Temporary char pointer */
155 char build_buf[128]; /* Buffer for building the bootline */
156
157 /* ---------------------------------------------------
158 *
159 * Check the loadaddr variable.
160 * If we don't know where the image is then we're done.
161 */
162
163 if (argc < 2)
164 addr = load_addr;
165 else
166 addr = simple_strtoul(argv[1], NULL, 16);
167
168 #if defined(CONFIG_CMD_NET)
169 /*
170 * Check to see if we need to tftp the image ourselves before starting
171 */
172 if ((argc == 2) && (strcmp(argv[1], "tftp") == 0)) {
173 if (net_loop(TFTPGET) <= 0)
174 return 1;
175 printf("Automatic boot of VxWorks image at address 0x%08lx ...\n",
176 addr);
177 }
178 #endif
179
180 /* This should equate
181 * to NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
182 * from the VxWorks BSP header files.
183 * This will vary from board to board
184 */
185
186 #if defined(CONFIG_WALNUT)
187 tmp = (char *) CONFIG_SYS_NVRAM_BASE_ADDR + 0x500;
188 eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
189 memcpy(tmp, &build_buf[3], 3);
190 #elif defined(CONFIG_SYS_VXWORKS_MAC_PTR)
191 tmp = (char *) CONFIG_SYS_VXWORKS_MAC_PTR;
192 eth_getenv_enetaddr("ethaddr", (uchar *)build_buf);
193 memcpy(tmp, build_buf, 6);
194 #else
195 puts("## Ethernet MAC address not copied to NV RAM\n");
196 #endif
197
198 /*
199 * Use bootaddr to find the location in memory that VxWorks
200 * will look for the bootline string. The default value for
201 * PowerPC is LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET which
202 * defaults to 0x4200
203 */
204 tmp = getenv("bootaddr");
205 if (!tmp)
206 bootaddr = CONFIG_SYS_VXWORKS_BOOT_ADDR;
207 else
208 bootaddr = simple_strtoul(tmp, NULL, 16);
209
210 /*
211 * Check to see if the bootline is defined in the 'bootargs'
212 * parameter. If it is not defined, we may be able to
213 * construct the info
214 */
215 bootline = getenv("bootargs");
216 if (bootline) {
217 memcpy((void *)bootaddr, bootline,
218 max(strlen(bootline), (size_t)255));
219 flush_cache(bootaddr, max(strlen(bootline), (size_t)255));
220 } else {
221 sprintf(build_buf, CONFIG_SYS_VXWORKS_BOOT_DEVICE);
222 tmp = getenv("bootfile");
223 if (tmp)
224 sprintf(&build_buf[strlen(build_buf)],
225 "%s:%s ", CONFIG_SYS_VXWORKS_SERVERNAME, tmp);
226 else
227 sprintf(&build_buf[strlen(build_buf)],
228 "%s:file ", CONFIG_SYS_VXWORKS_SERVERNAME);
229
230 tmp = getenv("ipaddr");
231 if (tmp)
232 sprintf(&build_buf[strlen(build_buf)], "e=%s ", tmp);
233
234 tmp = getenv("serverip");
235 if (tmp)
236 sprintf(&build_buf[strlen(build_buf)], "h=%s ", tmp);
237
238 tmp = getenv("hostname");
239 if (tmp)
240 sprintf(&build_buf[strlen(build_buf)], "tn=%s ", tmp);
241
242 #ifdef CONFIG_SYS_VXWORKS_ADD_PARAMS
243 sprintf(&build_buf[strlen(build_buf)],
244 CONFIG_SYS_VXWORKS_ADD_PARAMS);
245 #endif
246
247 memcpy((void *)bootaddr, build_buf,
248 max(strlen(build_buf), (size_t)255));
249 flush_cache(bootaddr, max(strlen(build_buf), (size_t)255));
250 }
251
252 /*
253 * If the data at the load address is an elf image, then
254 * treat it like an elf image. Otherwise, assume that it is a
255 * binary image
256 */
257
258 if (valid_elf_image(addr)) {
259 addr = load_elf_image_shdr(addr);
260 } else {
261 puts("## Not an ELF image, assuming binary\n");
262 /* leave addr as load_addr */
263 }
264
265 printf("## Using bootline (@ 0x%lx): %s\n", bootaddr,
266 (char *) bootaddr);
267 printf("## Starting vxWorks at 0x%08lx ...\n", addr);
268
269 dcache_disable();
270 ((void (*)(int)) addr) (0);
271
272 puts("## vxWorks terminated\n");
273 return 1;
274 }
275
276 /* ======================================================================
277 * A very simple elf loader, assumes the image is valid, returns the
278 * entry point address.
279 * ====================================================================== */
280 static unsigned long load_elf_image_phdr(unsigned long addr)
281 {
282 Elf32_Ehdr *ehdr; /* Elf header structure pointer */
283 Elf32_Phdr *phdr; /* Program header structure pointer */
284 int i;
285
286 ehdr = (Elf32_Ehdr *) addr;
287 phdr = (Elf32_Phdr *) (addr + ehdr->e_phoff);
288
289 /* Load each program header */
290 for (i = 0; i < ehdr->e_phnum; ++i) {
291 void *dst = (void *)(uintptr_t) phdr->p_paddr;
292 void *src = (void *) addr + phdr->p_offset;
293 debug("Loading phdr %i to 0x%p (%i bytes)\n",
294 i, dst, phdr->p_filesz);
295 if (phdr->p_filesz)
296 memcpy(dst, src, phdr->p_filesz);
297 if (phdr->p_filesz != phdr->p_memsz)
298 memset(dst + phdr->p_filesz, 0x00,
299 phdr->p_memsz - phdr->p_filesz);
300 flush_cache((unsigned long)dst, phdr->p_filesz);
301 ++phdr;
302 }
303
304 return ehdr->e_entry;
305 }
306
307 static unsigned long load_elf_image_shdr(unsigned long addr)
308 {
309 Elf32_Ehdr *ehdr; /* Elf header structure pointer */
310 Elf32_Shdr *shdr; /* Section header structure pointer */
311 unsigned char *strtab = 0; /* String table pointer */
312 unsigned char *image; /* Binary image pointer */
313 int i; /* Loop counter */
314
315 /* -------------------------------------------------- */
316
317 ehdr = (Elf32_Ehdr *) addr;
318
319 /* Find the section header string table for output info */
320 shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
321 (ehdr->e_shstrndx * sizeof(Elf32_Shdr)));
322
323 if (shdr->sh_type == SHT_STRTAB)
324 strtab = (unsigned char *) (addr + shdr->sh_offset);
325
326 /* Load each appropriate section */
327 for (i = 0; i < ehdr->e_shnum; ++i) {
328 shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
329 (i * sizeof(Elf32_Shdr)));
330
331 if (!(shdr->sh_flags & SHF_ALLOC)
332 || shdr->sh_addr == 0 || shdr->sh_size == 0) {
333 continue;
334 }
335
336 if (strtab) {
337 debug("%sing %s @ 0x%08lx (%ld bytes)\n",
338 (shdr->sh_type == SHT_NOBITS) ?
339 "Clear" : "Load",
340 &strtab[shdr->sh_name],
341 (unsigned long) shdr->sh_addr,
342 (long) shdr->sh_size);
343 }
344
345 if (shdr->sh_type == SHT_NOBITS) {
346 memset((void *)(uintptr_t) shdr->sh_addr, 0,
347 shdr->sh_size);
348 } else {
349 image = (unsigned char *) addr + shdr->sh_offset;
350 memcpy((void *)(uintptr_t) shdr->sh_addr,
351 (const void *) image,
352 shdr->sh_size);
353 }
354 flush_cache(shdr->sh_addr, shdr->sh_size);
355 }
356
357 return ehdr->e_entry;
358 }
359
360 /* ====================================================================== */
361 U_BOOT_CMD(
362 bootelf, 3, 0, do_bootelf,
363 "Boot from an ELF image in memory",
364 "[-p|-s] [address]\n"
365 "\t- load ELF image at [address] via program headers (-p)\n"
366 "\t or via section headers (-s)"
367 );
368
369 U_BOOT_CMD(
370 bootvx, 2, 0, do_bootvx,
371 "Boot vxWorks from an ELF image",
372 " [address] - load address of vxWorks ELF image."
373 );