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 <command.h> 18 #include <elf.h> 19 #include <net.h> 20 #include <vxworks.h> 21 #ifdef CONFIG_X86 22 #include <asm/e820.h> 23 #include <linux/linkage.h> 24 #endif 25 26 /* 27 * A very simple elf loader, assumes the image is valid, returns the 28 * entry point address. 29 */ 30 static unsigned long load_elf_image_phdr(unsigned long addr) 31 { 32 Elf32_Ehdr *ehdr; /* Elf header structure pointer */ 33 Elf32_Phdr *phdr; /* Program header structure pointer */ 34 int i; 35 36 ehdr = (Elf32_Ehdr *)addr; 37 phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff); 38 39 /* Load each program header */ 40 for (i = 0; i < ehdr->e_phnum; ++i) { 41 void *dst = (void *)(uintptr_t)phdr->p_paddr; 42 void *src = (void *)addr + phdr->p_offset; 43 debug("Loading phdr %i to 0x%p (%i bytes)\n", 44 i, dst, phdr->p_filesz); 45 if (phdr->p_filesz) 46 memcpy(dst, src, phdr->p_filesz); 47 if (phdr->p_filesz != phdr->p_memsz) 48 memset(dst + phdr->p_filesz, 0x00, 49 phdr->p_memsz - phdr->p_filesz); 50 flush_cache((unsigned long)dst, phdr->p_filesz); 51 ++phdr; 52 } 53 54 return ehdr->e_entry; 55 } 56 57 static unsigned long load_elf_image_shdr(unsigned long addr) 58 { 59 Elf32_Ehdr *ehdr; /* Elf header structure pointer */ 60 Elf32_Shdr *shdr; /* Section header structure pointer */ 61 unsigned char *strtab = 0; /* String table pointer */ 62 unsigned char *image; /* Binary image pointer */ 63 int i; /* Loop counter */ 64 65 ehdr = (Elf32_Ehdr *)addr; 66 67 /* Find the section header string table for output info */ 68 shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff + 69 (ehdr->e_shstrndx * sizeof(Elf32_Shdr))); 70 71 if (shdr->sh_type == SHT_STRTAB) 72 strtab = (unsigned char *)(addr + shdr->sh_offset); 73 74 /* Load each appropriate section */ 75 for (i = 0; i < ehdr->e_shnum; ++i) { 76 shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff + 77 (i * sizeof(Elf32_Shdr))); 78 79 if (!(shdr->sh_flags & SHF_ALLOC) || 80 shdr->sh_addr == 0 || shdr->sh_size == 0) { 81 continue; 82 } 83 84 if (strtab) { 85 debug("%sing %s @ 0x%08lx (%ld bytes)\n", 86 (shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load", 87 &strtab[shdr->sh_name], 88 (unsigned long)shdr->sh_addr, 89 (long)shdr->sh_size); 90 } 91 92 if (shdr->sh_type == SHT_NOBITS) { 93 memset((void *)(uintptr_t)shdr->sh_addr, 0, 94 shdr->sh_size); 95 } else { 96 image = (unsigned char *)addr + shdr->sh_offset; 97 memcpy((void *)(uintptr_t)shdr->sh_addr, 98 (const void *)image, shdr->sh_size); 99 } 100 flush_cache(shdr->sh_addr, shdr->sh_size); 101 } 102 103 return ehdr->e_entry; 104 } 105 106 /* Allow ports to override the default behavior */ 107 static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]), 108 int argc, char * const argv[]) 109 { 110 unsigned long ret; 111 112 /* 113 * QNX images require the data cache is disabled. 114 * Data cache is already flushed, so just turn it off. 115 */ 116 int dcache = dcache_status(); 117 if (dcache) 118 dcache_disable(); 119 120 /* 121 * pass address parameter as argv[0] (aka command name), 122 * and all remaining args 123 */ 124 ret = entry(argc, argv); 125 126 if (dcache) 127 dcache_enable(); 128 129 return ret; 130 } 131 132 /* 133 * Determine if a valid ELF image exists at the given memory location. 134 * First look at the ELF header magic field, then make sure that it is 135 * executable. 136 */ 137 int valid_elf_image(unsigned long addr) 138 { 139 Elf32_Ehdr *ehdr; /* Elf header structure pointer */ 140 141 ehdr = (Elf32_Ehdr *)addr; 142 143 if (!IS_ELF(*ehdr)) { 144 printf("## No elf image at address 0x%08lx\n", addr); 145 return 0; 146 } 147 148 if (ehdr->e_type != ET_EXEC) { 149 printf("## Not a 32-bit elf image at address 0x%08lx\n", addr); 150 return 0; 151 } 152 153 return 1; 154 } 155 156 /* Interpreter command to boot an arbitrary ELF image from memory */ 157 int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 158 { 159 unsigned long addr; /* Address of the ELF image */ 160 unsigned long rc; /* Return value from user code */ 161 char *sload, *saddr; 162 const char *ep = getenv("autostart"); 163 164 int rcode = 0; 165 166 sload = saddr = NULL; 167 if (argc == 3) { 168 sload = argv[1]; 169 saddr = argv[2]; 170 } else if (argc == 2) { 171 if (argv[1][0] == '-') 172 sload = argv[1]; 173 else 174 saddr = argv[1]; 175 } 176 177 if (saddr) 178 addr = simple_strtoul(saddr, NULL, 16); 179 else 180 addr = load_addr; 181 182 if (!valid_elf_image(addr)) 183 return 1; 184 185 if (sload && sload[1] == 'p') 186 addr = load_elf_image_phdr(addr); 187 else 188 addr = load_elf_image_shdr(addr); 189 190 if (ep && !strcmp(ep, "no")) 191 return rcode; 192 193 printf("## Starting application at 0x%08lx ...\n", addr); 194 195 /* 196 * pass address parameter as argv[0] (aka command name), 197 * and all remaining args 198 */ 199 rc = do_bootelf_exec((void *)addr, argc - 1, argv + 1); 200 if (rc != 0) 201 rcode = 1; 202 203 printf("## Application terminated, rc = 0x%lx\n", rc); 204 205 return rcode; 206 } 207 208 /* 209 * Interpreter command to boot VxWorks from a memory image. The image can 210 * be either an ELF image or a raw binary. Will attempt to setup the 211 * bootline and other parameters correctly. 212 */ 213 int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 214 { 215 unsigned long addr; /* Address of image */ 216 unsigned long bootaddr; /* Address to put the bootline */ 217 char *bootline; /* Text of the bootline */ 218 char *tmp; /* Temporary char pointer */ 219 char build_buf[128]; /* Buffer for building the bootline */ 220 int ptr = 0; 221 #ifdef CONFIG_X86 222 struct e820info *info; 223 struct e820entry *data; 224 #endif 225 226 /* 227 * Check the loadaddr variable. 228 * If we don't know where the image is then we're done. 229 */ 230 if (argc < 2) 231 addr = load_addr; 232 else 233 addr = simple_strtoul(argv[1], NULL, 16); 234 235 #if defined(CONFIG_CMD_NET) 236 /* 237 * Check to see if we need to tftp the image ourselves 238 * before starting 239 */ 240 if ((argc == 2) && (strcmp(argv[1], "tftp") == 0)) { 241 if (net_loop(TFTPGET) <= 0) 242 return 1; 243 printf("Automatic boot of VxWorks image at address 0x%08lx ...\n", 244 addr); 245 } 246 #endif 247 248 /* 249 * This should equate to 250 * NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET 251 * from the VxWorks BSP header files. 252 * This will vary from board to board 253 */ 254 #if defined(CONFIG_WALNUT) 255 tmp = (char *)CONFIG_SYS_NVRAM_BASE_ADDR + 0x500; 256 eth_getenv_enetaddr("ethaddr", (uchar *)build_buf); 257 memcpy(tmp, &build_buf[3], 3); 258 #elif defined(CONFIG_SYS_VXWORKS_MAC_PTR) 259 tmp = (char *)CONFIG_SYS_VXWORKS_MAC_PTR; 260 eth_getenv_enetaddr("ethaddr", (uchar *)build_buf); 261 memcpy(tmp, build_buf, 6); 262 #else 263 puts("## Ethernet MAC address not copied to NV RAM\n"); 264 #endif 265 266 /* 267 * Use bootaddr to find the location in memory that VxWorks 268 * will look for the bootline string. The default value is 269 * (LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET) as defined by 270 * VxWorks BSP. For example, on PowerPC it defaults to 0x4200. 271 */ 272 tmp = getenv("bootaddr"); 273 if (!tmp) { 274 printf("## VxWorks bootline address not specified\n"); 275 } else { 276 bootaddr = simple_strtoul(tmp, NULL, 16); 277 278 /* 279 * Check to see if the bootline is defined in the 'bootargs' 280 * parameter. If it is not defined, we may be able to 281 * construct the info. 282 */ 283 bootline = getenv("bootargs"); 284 if (bootline) { 285 memcpy((void *)bootaddr, bootline, 286 max(strlen(bootline), (size_t)255)); 287 flush_cache(bootaddr, max(strlen(bootline), 288 (size_t)255)); 289 } else { 290 tmp = getenv("bootdev"); 291 if (tmp) { 292 strcpy(build_buf, tmp); 293 ptr = strlen(tmp); 294 } else 295 printf("## VxWorks boot device not specified\n"); 296 297 tmp = getenv("bootfile"); 298 if (tmp) 299 ptr += sprintf(build_buf + ptr, 300 "host:%s ", tmp); 301 else 302 ptr += sprintf(build_buf + ptr, 303 "host:vxWorks "); 304 305 /* 306 * The following parameters are only needed if 'bootdev' 307 * is an ethernet device, otherwise they are optional. 308 */ 309 tmp = getenv("ipaddr"); 310 if (tmp) { 311 ptr += sprintf(build_buf + ptr, "e=%s", tmp); 312 tmp = getenv("netmask"); 313 if (tmp) { 314 u32 mask = getenv_ip("netmask").s_addr; 315 ptr += sprintf(build_buf + ptr, 316 ":%08x ", ntohl(mask)); 317 } else { 318 ptr += sprintf(build_buf + ptr, " "); 319 } 320 } 321 322 tmp = getenv("serverip"); 323 if (tmp) 324 ptr += sprintf(build_buf + ptr, "h=%s ", tmp); 325 326 tmp = getenv("gatewayip"); 327 if (tmp) 328 ptr += sprintf(build_buf + ptr, "g=%s ", tmp); 329 330 tmp = getenv("hostname"); 331 if (tmp) 332 ptr += sprintf(build_buf + ptr, "tn=%s ", tmp); 333 334 tmp = getenv("othbootargs"); 335 if (tmp) { 336 strcpy(build_buf + ptr, tmp); 337 ptr += strlen(tmp); 338 } 339 340 memcpy((void *)bootaddr, build_buf, 341 max(strlen(build_buf), (size_t)255)); 342 flush_cache(bootaddr, max(strlen(build_buf), 343 (size_t)255)); 344 } 345 346 printf("## Using bootline (@ 0x%lx): %s\n", bootaddr, 347 (char *)bootaddr); 348 } 349 350 #ifdef CONFIG_X86 351 /* 352 * Since E820 information is critical to the kernel, if we don't 353 * specify these in the environments, use a default one. 354 */ 355 tmp = getenv("e820data"); 356 if (tmp) 357 data = (struct e820entry *)simple_strtoul(tmp, NULL, 16); 358 else 359 data = (struct e820entry *)VXWORKS_E820_DATA_ADDR; 360 tmp = getenv("e820info"); 361 if (tmp) 362 info = (struct e820info *)simple_strtoul(tmp, NULL, 16); 363 else 364 info = (struct e820info *)VXWORKS_E820_INFO_ADDR; 365 366 memset(info, 0, sizeof(struct e820info)); 367 info->sign = E820_SIGNATURE; 368 info->entries = install_e820_map(E820MAX, data); 369 info->addr = (info->entries - 1) * sizeof(struct e820entry) + 370 VXWORKS_E820_DATA_ADDR; 371 #endif 372 373 /* 374 * If the data at the load address is an elf image, then 375 * treat it like an elf image. Otherwise, assume that it is a 376 * binary image. 377 */ 378 if (valid_elf_image(addr)) 379 addr = load_elf_image_shdr(addr); 380 else 381 puts("## Not an ELF image, assuming binary\n"); 382 383 printf("## Starting vxWorks at 0x%08lx ...\n", addr); 384 385 dcache_disable(); 386 #ifdef CONFIG_X86 387 /* VxWorks on x86 uses stack to pass parameters */ 388 ((asmlinkage void (*)(int))addr)(0); 389 #else 390 ((void (*)(int))addr)(0); 391 #endif 392 393 puts("## vxWorks terminated\n"); 394 395 return 1; 396 } 397 398 U_BOOT_CMD( 399 bootelf, 3, 0, do_bootelf, 400 "Boot from an ELF image in memory", 401 "[-p|-s] [address]\n" 402 "\t- load ELF image at [address] via program headers (-p)\n" 403 "\t or via section headers (-s)" 404 ); 405 406 U_BOOT_CMD( 407 bootvx, 2, 0, do_bootvx, 408 "Boot vxWorks from an ELF image", 409 " [address] - load address of vxWorks ELF image." 410 ); 411