1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * Copyright (c) 2004, 2006 Marcel Moolenaar 4 * Copyright (c) 2014 The FreeBSD Foundation 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <stand.h> 33 #include <string.h> 34 #include <sys/param.h> 35 #include <sys/linker.h> 36 #include <sys/reboot.h> 37 #include <sys/boot.h> 38 #include <machine/cpufunc.h> 39 #include <machine/elf.h> 40 #include <machine/metadata.h> 41 #include <machine/psl.h> 42 43 #ifdef EFI 44 #include <efi.h> 45 #include <efilib.h> 46 #else 47 #include "kboot.h" 48 #endif 49 50 #include "bootstrap.h" 51 #include "modinfo.h" 52 53 #if defined(__amd64__) 54 #include <machine/specialreg.h> 55 #endif 56 57 #ifdef EFI 58 #include "loader_efi.h" 59 #include "gfx_fb.h" 60 #endif 61 62 #if defined(LOADER_FDT_SUPPORT) 63 #include <fdt_platform.h> 64 #endif 65 66 #ifdef LOADER_GELI_SUPPORT 67 #include "geliboot.h" 68 #endif 69 70 int bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp, 71 bool exit_bs); 72 73 static int 74 bi_getboothowto(char *kargs) 75 { 76 #ifdef EFI 77 const char *sw, *tmp; 78 char *opts; 79 int speed, port; 80 char buf[50]; 81 #endif 82 char *console; 83 int howto; 84 85 howto = boot_parse_cmdline(kargs); 86 howto |= boot_env_to_howto(); 87 88 console = getenv("console"); 89 if (console != NULL) { 90 if (strcmp(console, "comconsole") == 0) 91 howto |= RB_SERIAL; 92 if (strcmp(console, "nullconsole") == 0) 93 howto |= RB_MUTE; 94 #ifdef EFI 95 #if defined(__i386__) || defined(__amd64__) 96 if (strcmp(console, "efi") == 0 && 97 getenv("efi_8250_uid") != NULL && 98 getenv("hw.uart.console") == NULL) { 99 /* 100 * If we found a 8250 com port and com speed, we need to 101 * tell the kernel where the serial port is, and how 102 * fast. Ideally, we'd get the port from ACPI, but that 103 * isn't running in the loader. Do the next best thing 104 * by allowing it to be set by a loader.conf variable, 105 * either a EFI specific one, or the compatible 106 * comconsole_port if not. PCI support is needed, but 107 * for that we'd ideally refactor the 108 * libi386/comconsole.c code to have identical behavior. 109 * We only try to set the port for cases where we saw 110 * the Serial(x) node when parsing, otherwise 111 * specialized hardware that has Uart nodes will have a 112 * bogus address set. 113 * But if someone specifically setup hw.uart.console, 114 * don't override that. 115 */ 116 speed = -1; 117 port = -1; 118 tmp = getenv("efi_com_speed"); 119 if (tmp != NULL) 120 speed = strtol(tmp, NULL, 0); 121 tmp = getenv("efi_com_port"); 122 if (tmp == NULL) 123 tmp = getenv("comconsole_port"); 124 if (tmp != NULL) 125 port = strtol(tmp, NULL, 0); 126 if (speed != -1 && port != -1) { 127 snprintf(buf, sizeof(buf), "io:%d,br:%d", port, 128 speed); 129 env_setenv("hw.uart.console", EV_VOLATILE, buf, 130 NULL, NULL); 131 } 132 } 133 #endif 134 #endif 135 } 136 137 return (howto); 138 } 139 140 #ifdef EFI 141 static EFI_STATUS 142 efi_do_vmap(EFI_MEMORY_DESCRIPTOR *mm, UINTN sz, UINTN mmsz, UINT32 mmver) 143 { 144 EFI_MEMORY_DESCRIPTOR *desc, *viter, *vmap; 145 EFI_STATUS ret; 146 int curr, ndesc, nset; 147 148 nset = 0; 149 desc = mm; 150 ndesc = sz / mmsz; 151 vmap = malloc(sz); 152 if (vmap == NULL) 153 /* This isn't really an EFI error case, but pretend it is */ 154 return (EFI_OUT_OF_RESOURCES); 155 viter = vmap; 156 for (curr = 0; curr < ndesc; 157 curr++, desc = NextMemoryDescriptor(desc, mmsz)) { 158 if ((desc->Attribute & EFI_MEMORY_RUNTIME) != 0) { 159 ++nset; 160 desc->VirtualStart = desc->PhysicalStart; 161 *viter = *desc; 162 viter = NextMemoryDescriptor(viter, mmsz); 163 } 164 } 165 ret = RS->SetVirtualAddressMap(nset * mmsz, mmsz, mmver, vmap); 166 free(vmap); 167 return (ret); 168 } 169 170 static int 171 bi_load_efi_data(struct preloaded_file *kfp, bool exit_bs) 172 { 173 EFI_MEMORY_DESCRIPTOR *mm; 174 EFI_PHYSICAL_ADDRESS addr = 0; 175 EFI_STATUS status; 176 const char *efi_novmap; 177 size_t efisz; 178 UINTN efi_mapkey; 179 UINTN dsz, pages, retry, sz; 180 UINT32 mmver; 181 struct efi_map_header *efihdr; 182 bool do_vmap; 183 184 #if defined(__amd64__) || defined(__aarch64__) 185 struct efi_fb efifb; 186 187 efifb.fb_addr = gfx_state.tg_fb.fb_addr; 188 efifb.fb_size = gfx_state.tg_fb.fb_size; 189 efifb.fb_height = gfx_state.tg_fb.fb_height; 190 efifb.fb_width = gfx_state.tg_fb.fb_width; 191 efifb.fb_stride = gfx_state.tg_fb.fb_stride; 192 efifb.fb_mask_red = gfx_state.tg_fb.fb_mask_red; 193 efifb.fb_mask_green = gfx_state.tg_fb.fb_mask_green; 194 efifb.fb_mask_blue = gfx_state.tg_fb.fb_mask_blue; 195 efifb.fb_mask_reserved = gfx_state.tg_fb.fb_mask_reserved; 196 197 if (efifb.fb_addr != 0) { 198 printf("EFI framebuffer information:\n"); 199 printf("addr, size 0x%jx, 0x%jx\n", 200 efifb.fb_addr, efifb.fb_size); 201 printf("dimensions %d x %d\n", 202 efifb.fb_width, efifb.fb_height); 203 printf("stride %d\n", efifb.fb_stride); 204 printf("masks 0x%08x, 0x%08x, 0x%08x, 0x%08x\n", 205 efifb.fb_mask_red, efifb.fb_mask_green, efifb.fb_mask_blue, 206 efifb.fb_mask_reserved); 207 208 file_addmetadata(kfp, MODINFOMD_EFI_FB, sizeof(efifb), &efifb); 209 } 210 #endif 211 212 do_vmap = true; 213 efi_novmap = getenv("efi_disable_vmap"); 214 if (efi_novmap != NULL) 215 do_vmap = strcasecmp(efi_novmap, "YES") != 0; 216 217 efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf; 218 219 /* 220 * Assign size of EFI_MEMORY_DESCRIPTOR to keep compatible with 221 * u-boot which doesn't fill this value when buffer for memory 222 * descriptors is too small (eg. 0 to obtain memory map size) 223 */ 224 dsz = sizeof(EFI_MEMORY_DESCRIPTOR); 225 226 /* 227 * Allocate enough pages to hold the bootinfo block and the 228 * memory map EFI will return to us. The memory map has an 229 * unknown size, so we have to determine that first. Note that 230 * the AllocatePages call can itself modify the memory map, so 231 * we have to take that into account as well. The changes to 232 * the memory map are caused by splitting a range of free 233 * memory into two, so that one is marked as being loader 234 * data. 235 */ 236 237 sz = 0; 238 mm = NULL; 239 240 /* 241 * Matthew Garrett has observed at least one system changing the 242 * memory map when calling ExitBootServices, causing it to return an 243 * error, probably because callbacks are allocating memory. 244 * So we need to retry calling it at least once. 245 */ 246 for (retry = 2; retry > 0; retry--) { 247 for (;;) { 248 status = BS->GetMemoryMap(&sz, mm, &efi_mapkey, &dsz, &mmver); 249 if (!EFI_ERROR(status)) 250 break; 251 252 if (status != EFI_BUFFER_TOO_SMALL) { 253 printf("%s: GetMemoryMap error %lu\n", __func__, 254 EFI_ERROR_CODE(status)); 255 return (EINVAL); 256 } 257 258 if (addr != 0) 259 BS->FreePages(addr, pages); 260 261 /* Add 10 descriptors to the size to allow for 262 * fragmentation caused by calling AllocatePages */ 263 sz += (10 * dsz); 264 pages = EFI_SIZE_TO_PAGES(sz + efisz); 265 status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData, 266 pages, &addr); 267 if (EFI_ERROR(status)) { 268 printf("%s: AllocatePages error %lu\n", __func__, 269 EFI_ERROR_CODE(status)); 270 return (ENOMEM); 271 } 272 273 /* 274 * Read the memory map and stash it after bootinfo. Align the 275 * memory map on a 16-byte boundary (the bootinfo block is page 276 * aligned). 277 */ 278 efihdr = (struct efi_map_header *)(uintptr_t)addr; 279 mm = (void *)((uint8_t *)efihdr + efisz); 280 sz = (EFI_PAGE_SIZE * pages) - efisz; 281 } 282 283 if (!exit_bs) 284 break; 285 status = efi_exit_boot_services(efi_mapkey); 286 if (!EFI_ERROR(status)) 287 break; 288 } 289 290 if (retry == 0) { 291 BS->FreePages(addr, pages); 292 printf("ExitBootServices error %lu\n", EFI_ERROR_CODE(status)); 293 return (EINVAL); 294 } 295 296 /* 297 * This may be disabled by setting efi_disable_vmap in 298 * loader.conf(5). By default we will setup the virtual 299 * map entries. 300 */ 301 302 if (do_vmap) 303 efi_do_vmap(mm, sz, dsz, mmver); 304 efihdr->memory_size = sz; 305 efihdr->descriptor_size = dsz; 306 efihdr->descriptor_version = mmver; 307 file_addmetadata(kfp, MODINFOMD_EFI_MAP, efisz + sz, 308 efihdr); 309 310 return (0); 311 } 312 #endif 313 314 /* 315 * Load the information expected by an amd64 kernel. 316 * 317 * - The 'boothowto' argument is constructed. 318 * - The 'bootdev' argument is constructed. 319 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 320 * - The kernel environment is copied into kernel space. 321 * - Module metadata are formatted and placed in kernel space. 322 */ 323 int 324 bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp, bool exit_bs) 325 { 326 struct preloaded_file *xp, *kfp; 327 struct devdesc *rootdev; 328 struct file_metadata *md; 329 vm_offset_t addr; 330 uint64_t kernend, module; 331 uint64_t envp; 332 vm_offset_t size; 333 char *rootdevname; 334 int howto; 335 bool is64 = sizeof(long) == 8; 336 #if defined(LOADER_FDT_SUPPORT) 337 vm_offset_t dtbp; 338 int dtb_size; 339 #endif 340 #if defined(__arm__) 341 vm_offset_t vaddr; 342 size_t i; 343 /* 344 * These metadata addreses must be converted for kernel after 345 * relocation. 346 */ 347 uint32_t mdt[] = { 348 MODINFOMD_SSYM, MODINFOMD_ESYM, MODINFOMD_KERNEND, 349 MODINFOMD_ENVP, MODINFOMD_FONT, 350 #if defined(LOADER_FDT_SUPPORT) 351 MODINFOMD_DTBP 352 #endif 353 }; 354 #endif 355 howto = bi_getboothowto(args); 356 357 /* 358 * Allow the environment variable 'rootdev' to override the supplied 359 * device. This should perhaps go to MI code and/or have $rootdev 360 * tested/set by MI code before launching the kernel. 361 */ 362 rootdevname = getenv("rootdev"); 363 archsw.arch_getdev((void**)(&rootdev), rootdevname, NULL); 364 if (rootdev == NULL) { 365 printf("Can't determine root device.\n"); 366 return(EINVAL); 367 } 368 369 /* Try reading the /etc/fstab file to select the root device */ 370 getrootmount(devformat(rootdev)); 371 372 addr = 0; 373 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 374 if (addr < xp->f_addr + xp->f_size) 375 addr = xp->f_addr + xp->f_size; 376 } 377 378 /* Pad to a page boundary. */ 379 addr = roundup(addr, PAGE_SIZE); 380 381 addr = build_font_module(addr); 382 383 /* Pad to a page boundary. */ 384 addr = roundup(addr, PAGE_SIZE); 385 386 /* Copy our environment. */ 387 envp = addr; 388 addr = md_copyenv(addr); 389 390 /* Pad to a page boundary. */ 391 addr = roundup(addr, PAGE_SIZE); 392 393 #if defined(LOADER_FDT_SUPPORT) 394 /* Handle device tree blob */ 395 dtbp = addr; 396 dtb_size = fdt_copy(addr); 397 398 /* Pad to a page boundary */ 399 if (dtb_size) 400 addr += roundup(dtb_size, PAGE_SIZE); 401 #endif 402 403 kfp = file_findfile(NULL, "elf kernel"); 404 if (kfp == NULL) 405 kfp = file_findfile(NULL, "elf64 kernel"); 406 if (kfp == NULL) 407 panic("can't find kernel file"); 408 kernend = 0; /* fill it in later */ 409 410 /* Figure out the size and location of the metadata. */ 411 module = *modulep = addr; 412 413 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof(howto), &howto); 414 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof(envp), &envp); 415 #if defined(LOADER_FDT_SUPPORT) 416 if (dtb_size) 417 file_addmetadata(kfp, MODINFOMD_DTBP, sizeof(dtbp), &dtbp); 418 else 419 printf("WARNING! Trying to fire up the kernel, but no " 420 "device tree blob found!\n"); 421 #endif 422 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof(kernend), &kernend); 423 #ifdef MODINFOMD_MODULEP 424 file_addmetadata(kfp, MODINFOMD_MODULEP, sizeof(module), &module); 425 #endif 426 #ifdef EFI 427 file_addmetadata(kfp, MODINFOMD_FW_HANDLE, sizeof(ST), &ST); 428 #endif 429 #ifdef LOADER_GELI_SUPPORT 430 geli_export_key_metadata(kfp); 431 #endif 432 #ifdef EFI 433 bi_load_efi_data(kfp, exit_bs); 434 #else 435 bi_loadsmap(kfp); 436 #endif 437 438 size = md_copymodules(0, is64); /* Find the size of the modules */ 439 kernend = roundup(addr + size, PAGE_SIZE); 440 *kernendp = kernend; 441 442 /* patch MODINFOMD_KERNEND */ 443 md = file_findmetadata(kfp, MODINFOMD_KERNEND); 444 bcopy(&kernend, md->md_data, sizeof kernend); 445 446 #if defined(__arm__) 447 *modulep -= __elfN(relocation_offset); 448 449 /* Do relocation fixup on metadata of each module. */ 450 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) { 451 for (i = 0; i < nitems(mdt); i++) { 452 md = file_findmetadata(xp, mdt[i]); 453 if (md) { 454 bcopy(md->md_data, &vaddr, sizeof vaddr); 455 vaddr -= __elfN(relocation_offset); 456 bcopy(&vaddr, md->md_data, sizeof vaddr); 457 } 458 } 459 } 460 #endif 461 462 /* Copy module list and metadata. */ 463 (void)md_copymodules(addr, is64); 464 465 return (0); 466 } 467