1 /*- 2 * Copyright (c) 2004 Marcel Moolenaar 3 * Copyright (c) 2001 Doug Rabson 4 * Copyright (c) 2016 The FreeBSD Foundation 5 * All rights reserved. 6 * 7 * Portions of this software were developed by Konstantin Belousov 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/efi.h> 37 #include <sys/kernel.h> 38 #include <sys/linker.h> 39 #include <sys/lock.h> 40 #include <sys/module.h> 41 #include <sys/mutex.h> 42 #include <sys/clock.h> 43 #include <sys/proc.h> 44 #include <sys/rwlock.h> 45 #include <sys/sched.h> 46 #include <sys/sysctl.h> 47 #include <sys/systm.h> 48 #include <sys/vmmeter.h> 49 50 #include <machine/fpu.h> 51 #include <machine/efi.h> 52 #include <machine/metadata.h> 53 #include <machine/vmparam.h> 54 55 #include <vm/vm.h> 56 #include <vm/pmap.h> 57 #include <vm/vm_map.h> 58 59 static struct efi_systbl *efi_systbl; 60 /* 61 * The following pointers point to tables in the EFI runtime service data pages. 62 * Care should be taken to make sure that we've properly entered the EFI runtime 63 * environment (efi_enter()) before dereferencing them. 64 */ 65 static struct efi_cfgtbl *efi_cfgtbl; 66 static struct efi_rt *efi_runtime; 67 68 static int efi_status2err[25] = { 69 0, /* EFI_SUCCESS */ 70 ENOEXEC, /* EFI_LOAD_ERROR */ 71 EINVAL, /* EFI_INVALID_PARAMETER */ 72 ENOSYS, /* EFI_UNSUPPORTED */ 73 EMSGSIZE, /* EFI_BAD_BUFFER_SIZE */ 74 EOVERFLOW, /* EFI_BUFFER_TOO_SMALL */ 75 EBUSY, /* EFI_NOT_READY */ 76 EIO, /* EFI_DEVICE_ERROR */ 77 EROFS, /* EFI_WRITE_PROTECTED */ 78 EAGAIN, /* EFI_OUT_OF_RESOURCES */ 79 EIO, /* EFI_VOLUME_CORRUPTED */ 80 ENOSPC, /* EFI_VOLUME_FULL */ 81 ENXIO, /* EFI_NO_MEDIA */ 82 ESTALE, /* EFI_MEDIA_CHANGED */ 83 ENOENT, /* EFI_NOT_FOUND */ 84 EACCES, /* EFI_ACCESS_DENIED */ 85 ETIMEDOUT, /* EFI_NO_RESPONSE */ 86 EADDRNOTAVAIL, /* EFI_NO_MAPPING */ 87 ETIMEDOUT, /* EFI_TIMEOUT */ 88 EDOOFUS, /* EFI_NOT_STARTED */ 89 EALREADY, /* EFI_ALREADY_STARTED */ 90 ECANCELED, /* EFI_ABORTED */ 91 EPROTO, /* EFI_ICMP_ERROR */ 92 EPROTO, /* EFI_TFTP_ERROR */ 93 EPROTO /* EFI_PROTOCOL_ERROR */ 94 }; 95 96 static int efi_enter(void); 97 static void efi_leave(void); 98 99 static int 100 efi_status_to_errno(efi_status status) 101 { 102 u_long code; 103 104 code = status & 0x3ffffffffffffffful; 105 return (code < nitems(efi_status2err) ? efi_status2err[code] : EDOOFUS); 106 } 107 108 static struct mtx efi_lock; 109 110 static bool 111 efi_is_in_map(struct efi_md *map, int ndesc, int descsz, vm_offset_t addr) 112 { 113 struct efi_md *p; 114 int i; 115 116 for (i = 0, p = map; i < ndesc; i++, p = efi_next_descriptor(p, 117 descsz)) { 118 if ((p->md_attr & EFI_MD_ATTR_RT) == 0) 119 continue; 120 121 if (addr >= (uintptr_t)p->md_virt && 122 addr < (uintptr_t)p->md_virt + p->md_pages * PAGE_SIZE) 123 return (true); 124 } 125 126 return (false); 127 } 128 129 static int 130 efi_init(void) 131 { 132 struct efi_map_header *efihdr; 133 struct efi_md *map; 134 struct efi_rt *rtdm; 135 caddr_t kmdp; 136 size_t efisz; 137 int ndesc, rt_disabled; 138 139 rt_disabled = 0; 140 TUNABLE_INT_FETCH("efi.rt.disabled", &rt_disabled); 141 if (rt_disabled == 1) 142 return (0); 143 mtx_init(&efi_lock, "efi", NULL, MTX_DEF); 144 145 if (efi_systbl_phys == 0) { 146 if (bootverbose) 147 printf("EFI systbl not available\n"); 148 return (0); 149 } 150 151 efi_systbl = (struct efi_systbl *)efi_phys_to_kva(efi_systbl_phys); 152 if (efi_systbl == NULL || efi_systbl->st_hdr.th_sig != EFI_SYSTBL_SIG) { 153 efi_systbl = NULL; 154 if (bootverbose) 155 printf("EFI systbl signature invalid\n"); 156 return (0); 157 } 158 efi_cfgtbl = (efi_systbl->st_cfgtbl == 0) ? NULL : 159 (struct efi_cfgtbl *)efi_systbl->st_cfgtbl; 160 if (efi_cfgtbl == NULL) { 161 if (bootverbose) 162 printf("EFI config table is not present\n"); 163 } 164 165 kmdp = preload_search_by_type("elf kernel"); 166 if (kmdp == NULL) 167 kmdp = preload_search_by_type("elf64 kernel"); 168 efihdr = (struct efi_map_header *)preload_search_info(kmdp, 169 MODINFO_METADATA | MODINFOMD_EFI_MAP); 170 if (efihdr == NULL) { 171 if (bootverbose) 172 printf("EFI map is not present\n"); 173 return (0); 174 } 175 efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf; 176 map = (struct efi_md *)((uint8_t *)efihdr + efisz); 177 if (efihdr->descriptor_size == 0) 178 return (ENOMEM); 179 180 ndesc = efihdr->memory_size / efihdr->descriptor_size; 181 if (!efi_create_1t1_map(map, ndesc, efihdr->descriptor_size)) { 182 if (bootverbose) 183 printf("EFI cannot create runtime map\n"); 184 return (ENOMEM); 185 } 186 187 efi_runtime = (efi_systbl->st_rt == 0) ? NULL : 188 (struct efi_rt *)efi_systbl->st_rt; 189 if (efi_runtime == NULL) { 190 if (bootverbose) 191 printf("EFI runtime services table is not present\n"); 192 efi_destroy_1t1_map(); 193 return (ENXIO); 194 } 195 196 #if defined(__aarch64__) || defined(__amd64__) 197 /* 198 * Some UEFI implementations have multiple implementations of the 199 * RS->GetTime function. They switch from one we can only use early 200 * in the boot process to one valid as a RunTime service only when we 201 * call RS->SetVirtualAddressMap. As this is not always the case, e.g. 202 * with an old loader.efi, check if the RS->GetTime function is within 203 * the EFI map, and fail to attach if not. 204 */ 205 rtdm = (struct efi_rt *)efi_phys_to_kva((uintptr_t)efi_runtime); 206 if (rtdm == NULL || !efi_is_in_map(map, ndesc, efihdr->descriptor_size, 207 (vm_offset_t)rtdm->rt_gettime)) { 208 if (bootverbose) 209 printf( 210 "EFI runtime services table has an invalid pointer\n"); 211 efi_runtime = NULL; 212 efi_destroy_1t1_map(); 213 return (ENXIO); 214 } 215 #endif 216 217 return (0); 218 } 219 220 static void 221 efi_uninit(void) 222 { 223 224 /* Most likely disabled by tunable */ 225 if (efi_runtime == NULL) 226 return; 227 efi_destroy_1t1_map(); 228 229 efi_systbl = NULL; 230 efi_cfgtbl = NULL; 231 efi_runtime = NULL; 232 233 mtx_destroy(&efi_lock); 234 } 235 236 int 237 efi_rt_ok(void) 238 { 239 240 if (efi_runtime == NULL) 241 return (ENXIO); 242 return (0); 243 } 244 245 static int 246 efi_enter(void) 247 { 248 struct thread *td; 249 pmap_t curpmap; 250 251 if (efi_runtime == NULL) 252 return (ENXIO); 253 td = curthread; 254 curpmap = &td->td_proc->p_vmspace->vm_pmap; 255 PMAP_LOCK(curpmap); 256 mtx_lock(&efi_lock); 257 fpu_kern_enter(td, NULL, FPU_KERN_NOCTX); 258 return (efi_arch_enter()); 259 } 260 261 static void 262 efi_leave(void) 263 { 264 struct thread *td; 265 pmap_t curpmap; 266 267 efi_arch_leave(); 268 269 curpmap = &curproc->p_vmspace->vm_pmap; 270 td = curthread; 271 fpu_kern_leave(td, NULL); 272 mtx_unlock(&efi_lock); 273 PMAP_UNLOCK(curpmap); 274 } 275 276 int 277 efi_get_table(struct uuid *uuid, void **ptr) 278 { 279 struct efi_cfgtbl *ct; 280 u_long count; 281 282 if (efi_cfgtbl == NULL || efi_systbl == NULL) 283 return (ENXIO); 284 count = efi_systbl->st_entries; 285 ct = efi_cfgtbl; 286 while (count--) { 287 if (!bcmp(&ct->ct_uuid, uuid, sizeof(*uuid))) { 288 *ptr = (void *)efi_phys_to_kva(ct->ct_data); 289 return (0); 290 } 291 ct++; 292 } 293 return (ENOENT); 294 } 295 296 static int 297 efi_get_time_locked(struct efi_tm *tm, struct efi_tmcap *tmcap) 298 { 299 efi_status status; 300 int error; 301 302 EFI_TIME_OWNED() 303 error = efi_enter(); 304 if (error != 0) 305 return (error); 306 status = efi_runtime->rt_gettime(tm, tmcap); 307 efi_leave(); 308 error = efi_status_to_errno(status); 309 return (error); 310 } 311 312 int 313 efi_get_time(struct efi_tm *tm) 314 { 315 struct efi_tmcap dummy; 316 int error; 317 318 if (efi_runtime == NULL) 319 return (ENXIO); 320 EFI_TIME_LOCK() 321 /* 322 * UEFI spec states that the Capabilities argument to GetTime is 323 * optional, but some UEFI implementations choke when passed a NULL 324 * pointer. Pass a dummy efi_tmcap, even though we won't use it, 325 * to workaround such implementations. 326 */ 327 error = efi_get_time_locked(tm, &dummy); 328 EFI_TIME_UNLOCK() 329 return (error); 330 } 331 332 int 333 efi_get_time_capabilities(struct efi_tmcap *tmcap) 334 { 335 struct efi_tm dummy; 336 int error; 337 338 if (efi_runtime == NULL) 339 return (ENXIO); 340 EFI_TIME_LOCK() 341 error = efi_get_time_locked(&dummy, tmcap); 342 EFI_TIME_UNLOCK() 343 return (error); 344 } 345 346 int 347 efi_reset_system(void) 348 { 349 int error; 350 351 error = efi_enter(); 352 if (error != 0) 353 return (error); 354 efi_runtime->rt_reset(EFI_RESET_WARM, 0, 0, NULL); 355 efi_leave(); 356 return (EIO); 357 } 358 359 static int 360 efi_set_time_locked(struct efi_tm *tm) 361 { 362 efi_status status; 363 int error; 364 365 EFI_TIME_OWNED(); 366 error = efi_enter(); 367 if (error != 0) 368 return (error); 369 status = efi_runtime->rt_settime(tm); 370 efi_leave(); 371 error = efi_status_to_errno(status); 372 return (error); 373 } 374 375 int 376 efi_set_time(struct efi_tm *tm) 377 { 378 int error; 379 380 if (efi_runtime == NULL) 381 return (ENXIO); 382 EFI_TIME_LOCK() 383 error = efi_set_time_locked(tm); 384 EFI_TIME_UNLOCK() 385 return (error); 386 } 387 388 int 389 efi_var_get(efi_char *name, struct uuid *vendor, uint32_t *attrib, 390 size_t *datasize, void *data) 391 { 392 efi_status status; 393 int error; 394 395 error = efi_enter(); 396 if (error != 0) 397 return (error); 398 status = efi_runtime->rt_getvar(name, vendor, attrib, datasize, data); 399 efi_leave(); 400 error = efi_status_to_errno(status); 401 return (error); 402 } 403 404 int 405 efi_var_nextname(size_t *namesize, efi_char *name, struct uuid *vendor) 406 { 407 efi_status status; 408 int error; 409 410 error = efi_enter(); 411 if (error != 0) 412 return (error); 413 status = efi_runtime->rt_scanvar(namesize, name, vendor); 414 efi_leave(); 415 error = efi_status_to_errno(status); 416 return (error); 417 } 418 419 int 420 efi_var_set(efi_char *name, struct uuid *vendor, uint32_t attrib, 421 size_t datasize, void *data) 422 { 423 efi_status status; 424 int error; 425 426 error = efi_enter(); 427 if (error != 0) 428 return (error); 429 status = efi_runtime->rt_setvar(name, vendor, attrib, datasize, data); 430 efi_leave(); 431 error = efi_status_to_errno(status); 432 return (error); 433 } 434 435 static int 436 efirt_modevents(module_t m, int event, void *arg __unused) 437 { 438 439 switch (event) { 440 case MOD_LOAD: 441 return (efi_init()); 442 443 case MOD_UNLOAD: 444 efi_uninit(); 445 return (0); 446 447 case MOD_SHUTDOWN: 448 return (0); 449 450 default: 451 return (EOPNOTSUPP); 452 } 453 } 454 455 static moduledata_t efirt_moddata = { 456 .name = "efirt", 457 .evhand = efirt_modevents, 458 .priv = NULL, 459 }; 460 /* After fpuinitstate, before efidev */ 461 DECLARE_MODULE(efirt, efirt_moddata, SI_SUB_DRIVERS, SI_ORDER_SECOND); 462 MODULE_VERSION(efirt, 1); 463