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