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 * pass address parameter as argv[0] (aka command name), 114 * and all remaining args 115 */ 116 ret = entry(argc, argv); 117 118 return ret; 119 } 120 121 /* 122 * Determine if a valid ELF image exists at the given memory location. 123 * First look at the ELF header magic field, then make sure that it is 124 * executable. 125 */ 126 int valid_elf_image(unsigned long addr) 127 { 128 Elf32_Ehdr *ehdr; /* Elf header structure pointer */ 129 130 ehdr = (Elf32_Ehdr *)addr; 131 132 if (!IS_ELF(*ehdr)) { 133 printf("## No elf image at address 0x%08lx\n", addr); 134 return 0; 135 } 136 137 if (ehdr->e_type != ET_EXEC) { 138 printf("## Not a 32-bit elf image at address 0x%08lx\n", addr); 139 return 0; 140 } 141 142 return 1; 143 } 144 145 /* Interpreter command to boot an arbitrary ELF image from memory */ 146 int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 147 { 148 unsigned long addr; /* Address of the ELF image */ 149 unsigned long rc; /* Return value from user code */ 150 char *sload = NULL; 151 const char *ep = getenv("autostart"); 152 int rcode = 0; 153 154 /* Consume 'bootelf' */ 155 argc--; argv++; 156 157 /* Check for flag. */ 158 if (argc >= 1 && (argv[0][0] == '-' && \ 159 (argv[0][1] == 'p' || argv[0][1] == 's'))) { 160 sload = argv[0]; 161 /* Consume flag. */ 162 argc--; argv++; 163 } 164 /* Check for address. */ 165 if (argc >= 1 && strict_strtoul(argv[0], 16, &addr) != -EINVAL) { 166 /* Consume address */ 167 argc--; argv++; 168 } else 169 addr = load_addr; 170 171 if (!valid_elf_image(addr)) 172 return 1; 173 174 if (sload && sload[1] == 'p') 175 addr = load_elf_image_phdr(addr); 176 else 177 addr = load_elf_image_shdr(addr); 178 179 if (ep && !strcmp(ep, "no")) 180 return rcode; 181 182 printf("## Starting application at 0x%08lx ...\n", addr); 183 184 /* 185 * pass address parameter as argv[0] (aka command name), 186 * and all remaining args 187 */ 188 rc = do_bootelf_exec((void *)addr, argc, argv); 189 if (rc != 0) 190 rcode = 1; 191 192 printf("## Application terminated, rc = 0x%lx\n", rc); 193 194 return rcode; 195 } 196 197 /* 198 * Interpreter command to boot VxWorks from a memory image. The image can 199 * be either an ELF image or a raw binary. Will attempt to setup the 200 * bootline and other parameters correctly. 201 */ 202 int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 203 { 204 unsigned long addr; /* Address of image */ 205 unsigned long bootaddr; /* Address to put the bootline */ 206 char *bootline; /* Text of the bootline */ 207 char *tmp; /* Temporary char pointer */ 208 char build_buf[128]; /* Buffer for building the bootline */ 209 int ptr = 0; 210 #ifdef CONFIG_X86 211 struct e820info *info; 212 struct e820entry *data; 213 #endif 214 215 /* 216 * Check the loadaddr variable. 217 * If we don't know where the image is then we're done. 218 */ 219 if (argc < 2) 220 addr = load_addr; 221 else 222 addr = simple_strtoul(argv[1], NULL, 16); 223 224 #if defined(CONFIG_CMD_NET) 225 /* 226 * Check to see if we need to tftp the image ourselves 227 * before starting 228 */ 229 if ((argc == 2) && (strcmp(argv[1], "tftp") == 0)) { 230 if (net_loop(TFTPGET) <= 0) 231 return 1; 232 printf("Automatic boot of VxWorks image at address 0x%08lx ...\n", 233 addr); 234 } 235 #endif 236 237 /* 238 * This should equate to 239 * NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET 240 * from the VxWorks BSP header files. 241 * This will vary from board to board 242 */ 243 #if defined(CONFIG_WALNUT) 244 tmp = (char *)CONFIG_SYS_NVRAM_BASE_ADDR + 0x500; 245 eth_getenv_enetaddr("ethaddr", (uchar *)build_buf); 246 memcpy(tmp, &build_buf[3], 3); 247 #elif defined(CONFIG_SYS_VXWORKS_MAC_PTR) 248 tmp = (char *)CONFIG_SYS_VXWORKS_MAC_PTR; 249 eth_getenv_enetaddr("ethaddr", (uchar *)build_buf); 250 memcpy(tmp, build_buf, 6); 251 #else 252 puts("## Ethernet MAC address not copied to NV RAM\n"); 253 #endif 254 255 /* 256 * Use bootaddr to find the location in memory that VxWorks 257 * will look for the bootline string. The default value is 258 * (LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET) as defined by 259 * VxWorks BSP. For example, on PowerPC it defaults to 0x4200. 260 */ 261 tmp = getenv("bootaddr"); 262 if (!tmp) { 263 printf("## VxWorks bootline address not specified\n"); 264 } else { 265 bootaddr = simple_strtoul(tmp, NULL, 16); 266 267 /* 268 * Check to see if the bootline is defined in the 'bootargs' 269 * parameter. If it is not defined, we may be able to 270 * construct the info. 271 */ 272 bootline = getenv("bootargs"); 273 if (bootline) { 274 memcpy((void *)bootaddr, bootline, 275 max(strlen(bootline), (size_t)255)); 276 flush_cache(bootaddr, max(strlen(bootline), 277 (size_t)255)); 278 } else { 279 tmp = getenv("bootdev"); 280 if (tmp) { 281 strcpy(build_buf, tmp); 282 ptr = strlen(tmp); 283 } else 284 printf("## VxWorks boot device not specified\n"); 285 286 tmp = getenv("bootfile"); 287 if (tmp) 288 ptr += sprintf(build_buf + ptr, 289 "host:%s ", tmp); 290 else 291 ptr += sprintf(build_buf + ptr, 292 "host:vxWorks "); 293 294 /* 295 * The following parameters are only needed if 'bootdev' 296 * is an ethernet device, otherwise they are optional. 297 */ 298 tmp = getenv("ipaddr"); 299 if (tmp) { 300 ptr += sprintf(build_buf + ptr, "e=%s", tmp); 301 tmp = getenv("netmask"); 302 if (tmp) { 303 u32 mask = getenv_ip("netmask").s_addr; 304 ptr += sprintf(build_buf + ptr, 305 ":%08x ", ntohl(mask)); 306 } else { 307 ptr += sprintf(build_buf + ptr, " "); 308 } 309 } 310 311 tmp = getenv("serverip"); 312 if (tmp) 313 ptr += sprintf(build_buf + ptr, "h=%s ", tmp); 314 315 tmp = getenv("gatewayip"); 316 if (tmp) 317 ptr += sprintf(build_buf + ptr, "g=%s ", tmp); 318 319 tmp = getenv("hostname"); 320 if (tmp) 321 ptr += sprintf(build_buf + ptr, "tn=%s ", tmp); 322 323 tmp = getenv("othbootargs"); 324 if (tmp) { 325 strcpy(build_buf + ptr, tmp); 326 ptr += strlen(tmp); 327 } 328 329 memcpy((void *)bootaddr, build_buf, 330 max(strlen(build_buf), (size_t)255)); 331 flush_cache(bootaddr, max(strlen(build_buf), 332 (size_t)255)); 333 } 334 335 printf("## Using bootline (@ 0x%lx): %s\n", bootaddr, 336 (char *)bootaddr); 337 } 338 339 #ifdef CONFIG_X86 340 /* 341 * Since E820 information is critical to the kernel, if we don't 342 * specify these in the environments, use a default one. 343 */ 344 tmp = getenv("e820data"); 345 if (tmp) 346 data = (struct e820entry *)simple_strtoul(tmp, NULL, 16); 347 else 348 data = (struct e820entry *)VXWORKS_E820_DATA_ADDR; 349 tmp = getenv("e820info"); 350 if (tmp) 351 info = (struct e820info *)simple_strtoul(tmp, NULL, 16); 352 else 353 info = (struct e820info *)VXWORKS_E820_INFO_ADDR; 354 355 memset(info, 0, sizeof(struct e820info)); 356 info->sign = E820_SIGNATURE; 357 info->entries = install_e820_map(E820MAX, data); 358 info->addr = (info->entries - 1) * sizeof(struct e820entry) + 359 VXWORKS_E820_DATA_ADDR; 360 #endif 361 362 /* 363 * If the data at the load address is an elf image, then 364 * treat it like an elf image. Otherwise, assume that it is a 365 * binary image. 366 */ 367 if (valid_elf_image(addr)) 368 addr = load_elf_image_shdr(addr); 369 else 370 puts("## Not an ELF image, assuming binary\n"); 371 372 printf("## Starting vxWorks at 0x%08lx ...\n", addr); 373 374 dcache_disable(); 375 #ifdef CONFIG_X86 376 /* VxWorks on x86 uses stack to pass parameters */ 377 ((asmlinkage void (*)(int))addr)(0); 378 #else 379 ((void (*)(int))addr)(0); 380 #endif 381 382 puts("## vxWorks terminated\n"); 383 384 return 1; 385 } 386 387 U_BOOT_CMD( 388 bootelf, CONFIG_SYS_MAXARGS, 0, do_bootelf, 389 "Boot from an ELF image in memory", 390 "[-p|-s] [address]\n" 391 "\t- load ELF image at [address] via program headers (-p)\n" 392 "\t or via section headers (-s)" 393 ); 394 395 U_BOOT_CMD( 396 bootvx, 2, 0, do_bootvx, 397 "Boot vxWorks from an ELF image", 398 " [address] - load address of vxWorks ELF image." 399 ); 400