1 /* 2 * EFI application runtime services 3 * 4 * Copyright (c) 2016 Alexander Graf 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <command.h> 11 #include <dm.h> 12 #include <efi_loader.h> 13 #include <rtc.h> 14 #include <asm/global_data.h> 15 16 /* For manual relocation support */ 17 DECLARE_GLOBAL_DATA_PTR; 18 19 static efi_status_t EFI_RUNTIME_TEXT EFIAPI efi_unimplemented(void); 20 static efi_status_t EFI_RUNTIME_TEXT EFIAPI efi_device_error(void); 21 static efi_status_t EFI_RUNTIME_TEXT EFIAPI efi_invalid_parameter(void); 22 23 #ifdef CONFIG_SYS_CACHELINE_SIZE 24 #define EFI_CACHELINE_SIZE CONFIG_SYS_CACHELINE_SIZE 25 #else 26 /* Just use the greatest cache flush alignment requirement I'm aware of */ 27 #define EFI_CACHELINE_SIZE 128 28 #endif 29 30 #if defined(CONFIG_ARM64) 31 #define R_RELATIVE 1027 32 #define R_MASK 0xffffffffULL 33 #define IS_RELA 1 34 #elif defined(CONFIG_ARM) 35 #define R_RELATIVE 23 36 #define R_MASK 0xffULL 37 #else 38 #error Need to add relocation awareness 39 #endif 40 41 struct elf_rel { 42 ulong *offset; 43 ulong info; 44 }; 45 46 struct elf_rela { 47 ulong *offset; 48 ulong info; 49 long addend; 50 }; 51 52 /* 53 * EFI Runtime code lives in 2 stages. In the first stage, U-Boot and an EFI 54 * payload are running concurrently at the same time. In this mode, we can 55 * handle a good number of runtime callbacks 56 */ 57 58 static void EFIAPI efi_reset_system(enum efi_reset_type reset_type, 59 efi_status_t reset_status, 60 unsigned long data_size, void *reset_data) 61 { 62 EFI_ENTRY("%d %lx %lx %p", reset_type, reset_status, data_size, 63 reset_data); 64 65 switch (reset_type) { 66 case EFI_RESET_COLD: 67 case EFI_RESET_WARM: 68 do_reset(NULL, 0, 0, NULL); 69 break; 70 case EFI_RESET_SHUTDOWN: 71 /* We don't have anything to map this to */ 72 break; 73 } 74 75 EFI_EXIT(EFI_SUCCESS); 76 } 77 78 static efi_status_t EFIAPI efi_get_time(struct efi_time *time, 79 struct efi_time_cap *capabilities) 80 { 81 #if defined(CONFIG_CMD_DATE) && defined(CONFIG_DM_RTC) 82 struct rtc_time tm; 83 int r; 84 struct udevice *dev; 85 86 EFI_ENTRY("%p %p", time, capabilities); 87 88 r = uclass_get_device(UCLASS_RTC, 0, &dev); 89 if (r) 90 return EFI_EXIT(EFI_DEVICE_ERROR); 91 92 r = dm_rtc_get(dev, &tm); 93 if (r) 94 return EFI_EXIT(EFI_DEVICE_ERROR); 95 96 memset(time, 0, sizeof(*time)); 97 time->year = tm.tm_year; 98 time->month = tm.tm_mon; 99 time->day = tm.tm_mday; 100 time->hour = tm.tm_hour; 101 time->minute = tm.tm_min; 102 time->daylight = tm.tm_isdst; 103 104 return EFI_EXIT(EFI_SUCCESS); 105 #else 106 return EFI_DEVICE_ERROR; 107 #endif 108 } 109 110 struct efi_runtime_detach_list_struct { 111 void *ptr; 112 void *patchto; 113 }; 114 115 static const struct efi_runtime_detach_list_struct efi_runtime_detach_list[] = { 116 { 117 /* do_reset is gone */ 118 .ptr = &efi_runtime_services.reset_system, 119 .patchto = NULL, 120 }, { 121 /* invalidate_*cache_all are gone */ 122 .ptr = &efi_runtime_services.set_virtual_address_map, 123 .patchto = &efi_invalid_parameter, 124 }, { 125 /* RTC accessors are gone */ 126 .ptr = &efi_runtime_services.get_time, 127 .patchto = &efi_device_error, 128 }, { 129 /* Clean up system table */ 130 .ptr = &systab.con_in, 131 .patchto = NULL, 132 }, { 133 /* Clean up system table */ 134 .ptr = &systab.con_out, 135 .patchto = NULL, 136 }, { 137 /* Clean up system table */ 138 .ptr = &systab.std_err, 139 .patchto = NULL, 140 }, { 141 /* Clean up system table */ 142 .ptr = &systab.boottime, 143 .patchto = NULL, 144 }, 145 }; 146 147 static bool efi_runtime_tobedetached(void *p) 148 { 149 int i; 150 151 for (i = 0; i < ARRAY_SIZE(efi_runtime_detach_list); i++) 152 if (efi_runtime_detach_list[i].ptr == p) 153 return true; 154 155 return false; 156 } 157 158 static void efi_runtime_detach(ulong offset) 159 { 160 int i; 161 ulong patchoff = offset - (ulong)gd->relocaddr; 162 163 for (i = 0; i < ARRAY_SIZE(efi_runtime_detach_list); i++) { 164 ulong patchto = (ulong)efi_runtime_detach_list[i].patchto; 165 ulong *p = efi_runtime_detach_list[i].ptr; 166 ulong newaddr = patchto ? (patchto + patchoff) : 0; 167 168 debug("%s: Setting %p to %lx\n", __func__, p, newaddr); 169 *p = newaddr; 170 } 171 } 172 173 /* Relocate EFI runtime to uboot_reloc_base = offset */ 174 void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map) 175 { 176 #ifdef IS_RELA 177 struct elf_rela *rel = (void*)&__efi_runtime_rel_start; 178 #else 179 struct elf_rel *rel = (void*)&__efi_runtime_rel_start; 180 static ulong lastoff = CONFIG_SYS_TEXT_BASE; 181 #endif 182 183 debug("%s: Relocating to offset=%lx\n", __func__, offset); 184 for (; (ulong)rel < (ulong)&__efi_runtime_rel_stop; rel++) { 185 ulong base = CONFIG_SYS_TEXT_BASE; 186 ulong *p; 187 ulong newaddr; 188 189 p = (void*)((ulong)rel->offset - base) + gd->relocaddr; 190 191 if ((rel->info & R_MASK) != R_RELATIVE) { 192 continue; 193 } 194 195 #ifdef IS_RELA 196 newaddr = rel->addend + offset - CONFIG_SYS_TEXT_BASE; 197 #else 198 newaddr = *p - lastoff + offset; 199 #endif 200 201 /* Check if the relocation is inside bounds */ 202 if (map && ((newaddr < map->virtual_start) || 203 newaddr > (map->virtual_start + (map->num_pages << 12)))) { 204 if (!efi_runtime_tobedetached(p)) 205 printf("U-Boot EFI: Relocation at %p is out of " 206 "range (%lx)\n", p, newaddr); 207 continue; 208 } 209 210 debug("%s: Setting %p to %lx\n", __func__, p, newaddr); 211 *p = newaddr; 212 flush_dcache_range((ulong)p & ~(EFI_CACHELINE_SIZE - 1), 213 ALIGN((ulong)&p[1], EFI_CACHELINE_SIZE)); 214 } 215 216 #ifndef IS_RELA 217 lastoff = offset; 218 #endif 219 220 invalidate_icache_all(); 221 } 222 223 static efi_status_t EFIAPI efi_set_virtual_address_map( 224 unsigned long memory_map_size, 225 unsigned long descriptor_size, 226 uint32_t descriptor_version, 227 struct efi_mem_desc *virtmap) 228 { 229 ulong runtime_start = (ulong)&__efi_runtime_start & ~0xfffULL; 230 int n = memory_map_size / descriptor_size; 231 int i; 232 233 EFI_ENTRY("%lx %lx %x %p", memory_map_size, descriptor_size, 234 descriptor_version, virtmap); 235 236 for (i = 0; i < n; i++) { 237 struct efi_mem_desc *map; 238 239 map = (void*)virtmap + (descriptor_size * i); 240 if (map->type == EFI_RUNTIME_SERVICES_CODE) { 241 ulong new_offset = map->virtual_start - (runtime_start - gd->relocaddr); 242 243 efi_runtime_relocate(new_offset, map); 244 /* Once we're virtual, we can no longer handle 245 complex callbacks */ 246 efi_runtime_detach(new_offset); 247 return EFI_EXIT(EFI_SUCCESS); 248 } 249 } 250 251 return EFI_EXIT(EFI_INVALID_PARAMETER); 252 } 253 254 /* 255 * In the second stage, U-Boot has disappeared. To isolate our runtime code 256 * that at this point still exists from the rest, we put it into a special 257 * section. 258 * 259 * !!WARNING!! 260 * 261 * This means that we can not rely on any code outside of this file in any 262 * function or variable below this line. 263 * 264 * Please keep everything fully self-contained and annotated with 265 * EFI_RUNTIME_TEXT and EFI_RUNTIME_DATA markers. 266 */ 267 268 /* 269 * Relocate the EFI runtime stub to a different place. We need to call this 270 * the first time we expose the runtime interface to a user and on set virtual 271 * address map calls. 272 */ 273 274 static efi_status_t EFI_RUNTIME_TEXT EFIAPI efi_unimplemented(void) 275 { 276 return EFI_UNSUPPORTED; 277 } 278 279 static efi_status_t EFI_RUNTIME_TEXT EFIAPI efi_device_error(void) 280 { 281 return EFI_DEVICE_ERROR; 282 } 283 284 static efi_status_t EFI_RUNTIME_TEXT EFIAPI efi_invalid_parameter(void) 285 { 286 return EFI_INVALID_PARAMETER; 287 } 288 289 struct efi_runtime_services EFI_RUNTIME_DATA efi_runtime_services = { 290 .hdr = { 291 .signature = EFI_RUNTIME_SERVICES_SIGNATURE, 292 .revision = EFI_RUNTIME_SERVICES_REVISION, 293 .headersize = sizeof(struct efi_table_hdr), 294 }, 295 .get_time = &efi_get_time, 296 .set_time = (void *)&efi_device_error, 297 .get_wakeup_time = (void *)&efi_unimplemented, 298 .set_wakeup_time = (void *)&efi_unimplemented, 299 .set_virtual_address_map = &efi_set_virtual_address_map, 300 .convert_pointer = (void *)&efi_invalid_parameter, 301 .get_variable = (void *)&efi_device_error, 302 .get_next_variable = (void *)&efi_device_error, 303 .set_variable = (void *)&efi_device_error, 304 .get_next_high_mono_count = (void *)&efi_device_error, 305 .reset_system = &efi_reset_system, 306 }; 307