cmd/bootefi.c

   1 /*
   2  *  EFI application loader
   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 <errno.h>
  14 #include <libfdt.h>
  15 #include <libfdt_env.h>
  16 #include <memalign.h>
  17 #include <asm/global_data.h>
  18 #include <asm-generic/sections.h>
  19 #include <linux/linkage.h>
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 static uint8_t efi_obj_list_initalized;
  24
  25 static struct efi_device_path *bootefi_image_path;
  26 static struct efi_device_path *bootefi_device_path;
  27
  28 /* Initialize and populate EFI object list */
  29 static void efi_init_obj_list(void)
  30 {
  31         efi_obj_list_initalized = 1;
  32
  33         efi_console_register();
  34 #ifdef CONFIG_PARTITIONS
  35         efi_disk_register();
  36 #endif
  37 #if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
  38         efi_gop_register();
  39 #endif
  40 #ifdef CONFIG_NET
  41         efi_net_register();
  42 #endif
  43 #ifdef CONFIG_GENERATE_SMBIOS_TABLE
  44         efi_smbios_register();
  45 #endif
  46
  47         /* Initialize EFI runtime services */
  48         efi_reset_system_init();
  49         efi_get_time_init();
  50 }
  51
  52 static void *copy_fdt(void *fdt)
  53 {
  54         u64 fdt_size = fdt_totalsize(fdt);
  55         unsigned long fdt_ram_start = -1L, fdt_pages;
  56         u64 new_fdt_addr;
  57         void *new_fdt;
  58         int i;
  59
  60         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
  61                 u64 ram_start = gd->bd->bi_dram[i].start;
  62                 u64 ram_size = gd->bd->bi_dram[i].size;
  63
  64                 if (!ram_size)
  65                         continue;
  66
  67                 if (ram_start < fdt_ram_start)
  68                         fdt_ram_start = ram_start;
  69         }
  70
  71         /* Give us at least 4kb breathing room */
  72         fdt_size = ALIGN(fdt_size + 4096, EFI_PAGE_SIZE);
  73         fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
  74
  75         /* Safe fdt location is at 128MB */
  76         new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size;
  77         if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages,
  78                                &new_fdt_addr) != EFI_SUCCESS) {
  79                 /* If we can't put it there, put it somewhere */
  80                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
  81                 if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages,
  82                                        &new_fdt_addr) != EFI_SUCCESS) {
  83                         printf("ERROR: Failed to reserve space for FDT\n");
  84                         return NULL;
  85                 }
  86         }
  87
  88         new_fdt = (void*)(ulong)new_fdt_addr;
  89         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
  90         fdt_set_totalsize(new_fdt, fdt_size);
  91
  92         return new_fdt;
  93 }
  94
  95 static ulong efi_do_enter(void *image_handle,
  96                           struct efi_system_table *st,
  97                           asmlinkage ulong (*entry)(void *image_handle,
  98                                 struct efi_system_table *st))
  99 {
 100         efi_status_t ret = EFI_LOAD_ERROR;
 101
 102         if (entry)
 103                 ret = entry(image_handle, st);
 104         st->boottime->exit(image_handle, ret, 0, NULL);
 105         return ret;
 106 }
 107
 108 #ifdef CONFIG_ARM64
 109 static unsigned long efi_run_in_el2(asmlinkage ulong (*entry)(
 110                         void *image_handle, struct efi_system_table *st),
 111                         void *image_handle, struct efi_system_table *st)
 112 {
 113         /* Enable caches again */
 114         dcache_enable();
 115
 116         return efi_do_enter(image_handle, st, entry);
 117 }
 118 #endif
 119
 120 /*
 121  * Load an EFI payload into a newly allocated piece of memory, register all
 122  * EFI objects it would want to access and jump to it.
 123  */
 124 static unsigned long do_bootefi_exec(void *efi, void *fdt,
 125                                      struct efi_device_path *device_path,
 126                                      struct efi_device_path *image_path)
 127 {
 128         struct efi_loaded_image loaded_image_info = {};
 129         struct efi_object loaded_image_info_obj = {};
 130         ulong ret;
 131
 132         ulong (*entry)(void *image_handle, struct efi_system_table *st)
 133                 asmlinkage;
 134         ulong fdt_pages, fdt_size, fdt_start, fdt_end;
 135         const efi_guid_t fdt_guid = EFI_FDT_GUID;
 136         bootm_headers_t img = { 0 };
 137
 138         /* Initialize and populate EFI object list */
 139         if (!efi_obj_list_initalized)
 140                 efi_init_obj_list();
 141
 142         efi_setup_loaded_image(&loaded_image_info, &loaded_image_info_obj,
 143                                device_path, image_path);
 144
 145         /*
 146          * gd lives in a fixed register which may get clobbered while we execute
 147          * the payload. So save it here and restore it on every callback entry
 148          */
 149         efi_save_gd();
 150
 151         if (fdt && !fdt_check_header(fdt)) {
 152                 /* Prepare fdt for payload */
 153                 fdt = copy_fdt(fdt);
 154
 155                 if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 156                         printf("ERROR: Failed to process device tree\n");
 157                         return -EINVAL;
 158                 }
 159
 160                 /* Link to it in the efi tables */
 161                 efi_install_configuration_table(&fdt_guid, fdt);
 162
 163                 /* And reserve the space in the memory map */
 164                 fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK;
 165                 fdt_end = ((ulong)fdt) + fdt_totalsize(fdt);
 166                 fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK;
 167                 fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
 168                 /* Give a bootloader the chance to modify the device tree */
 169                 fdt_pages += 2;
 170                 efi_add_memory_map(fdt_start, fdt_pages,
 171                                    EFI_BOOT_SERVICES_DATA, true);
 172         } else {
 173                 printf("WARNING: Invalid device tree, expect boot to fail\n");
 174                 efi_install_configuration_table(&fdt_guid, NULL);
 175         }
 176
 177         /* Load the EFI payload */
 178         entry = efi_load_pe(efi, &loaded_image_info);
 179         if (!entry) {
 180                 ret = -ENOENT;
 181                 goto exit;
 182         }
 183
 184         /* Call our payload! */
 185         debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
 186
 187         if (setjmp(&loaded_image_info.exit_jmp)) {
 188                 ret = loaded_image_info.exit_status;
 189                 EFI_EXIT(ret);
 190                 goto exit;
 191         }
 192
 193 #ifdef CONFIG_ARM64
 194         /* On AArch64 we need to make sure we call our payload in < EL3 */
 195         if (current_el() == 3) {
 196                 smp_kick_all_cpus();
 197                 dcache_disable();       /* flush cache before switch to EL2 */
 198
 199                 /* Move into EL2 and keep running there */
 200                 armv8_switch_to_el2((ulong)entry, (ulong)&loaded_image_info,
 201                                     (ulong)&systab, 0, (ulong)efi_run_in_el2,
 202                                     ES_TO_AARCH64);
 203
 204                 /* Should never reach here, efi exits with longjmp */
 205                 while (1) { }
 206         }
 207 #endif
 208
 209         ret = efi_do_enter(&loaded_image_info, &systab, entry);
 210
 211 exit:
 212         /* image has returned, loaded-image obj goes *poof*: */
 213         list_del(&loaded_image_info_obj.link);
 214
 215         return ret;
 216 }
 217
 218 /* Interpreter command to boot an arbitrary EFI image from memory */
 219 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 220 {
 221         char *saddr, *sfdt;
 222         unsigned long addr, fdt_addr = 0;
 223         unsigned long r;
 224
 225         if (argc < 2)
 226                 return CMD_RET_USAGE;
 227 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 228         if (!strcmp(argv[1], "hello")) {
 229                 ulong size = __efi_helloworld_end - __efi_helloworld_begin;
 230
 231                 saddr = env_get("loadaddr");
 232                 if (saddr)
 233                         addr = simple_strtoul(saddr, NULL, 16);
 234                 else
 235                         addr = CONFIG_SYS_LOAD_ADDR;
 236                 memcpy((char *)addr, __efi_helloworld_begin, size);
 237         } else
 238 #endif
 239 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 240         if (!strcmp(argv[1], "selftest")) {
 241                 /*
 242                  * gd lives in a fixed register which may get clobbered while we
 243                  * execute the payload. So save it here and restore it on every
 244                  * callback entry
 245                  */
 246                 efi_save_gd();
 247                 /* Initialize and populate EFI object list */
 248                 if (!efi_obj_list_initalized)
 249                         efi_init_obj_list();
 250                 loaded_image_info.device_handle = bootefi_device_path;
 251                 loaded_image_info.file_path = bootefi_image_path;
 252                 return efi_selftest(&loaded_image_info, &systab);
 253         } else
 254 #endif
 255         {
 256                 saddr = argv[1];
 257
 258                 addr = simple_strtoul(saddr, NULL, 16);
 259
 260                 if (argc > 2) {
 261                         sfdt = argv[2];
 262                         fdt_addr = simple_strtoul(sfdt, NULL, 16);
 263                 }
 264         }
 265
 266         printf("## Starting EFI application at %08lx ...\n", addr);
 267         r = do_bootefi_exec((void *)addr, (void *)fdt_addr,
 268                             bootefi_device_path, bootefi_image_path);
 269         printf("## Application terminated, r = %lu\n",
 270                r & ~EFI_ERROR_MASK);
 271
 272         if (r != EFI_SUCCESS)
 273                 return 1;
 274         else
 275                 return 0;
 276 }
 277
 278 #ifdef CONFIG_SYS_LONGHELP
 279 static char bootefi_help_text[] =
 280         "<image address> [fdt address]\n"
 281         "  - boot EFI payload stored at address <image address>.\n"
 282         "    If specified, the device tree located at <fdt address> gets\n"
 283         "    exposed as EFI configuration table.\n"
 284 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 285         "bootefi hello\n"
 286         "  - boot a sample Hello World application stored within U-Boot\n"
 287 #endif
 288 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 289         "bootefi selftest\n"
 290         "  - boot an EFI selftest application stored within U-Boot\n"
 291 #endif
 292         ;
 293 #endif
 294
 295 U_BOOT_CMD(
 296         bootefi, 3, 0, do_bootefi,
 297         "Boots an EFI payload from memory",
 298         bootefi_help_text
 299 );
 300
 301 static int parse_partnum(const char *devnr)
 302 {
 303         const char *str = strchr(devnr, ':');
 304         if (str) {
 305                 str++;
 306                 return simple_strtoul(str, NULL, 16);
 307         }
 308         return 0;
 309 }
 310
 311 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 312 {
 313         char filename[32] = { 0 }; /* dp->str is u16[32] long */
 314         char *s;
 315
 316         if (strcmp(dev, "Net")) {
 317                 struct blk_desc *desc;
 318                 int part;
 319
 320                 desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10));
 321                 part = parse_partnum(devnr);
 322
 323                 bootefi_device_path = efi_dp_from_part(desc, part);
 324         } else {
 325 #ifdef CONFIG_NET
 326                 bootefi_device_path = efi_dp_from_eth();
 327 #endif
 328         }
 329
 330         if (strcmp(dev, "Net")) {
 331                 /* Add leading / to fs paths, because they're absolute */
 332                 snprintf(filename, sizeof(filename), "/%s", path);
 333         } else {
 334                 snprintf(filename, sizeof(filename), "%s", path);
 335         }
 336         /* DOS style file path: */
 337         s = filename;
 338         while ((s = strchr(s, '/')))
 339                 *s++ = '\\';
 340         bootefi_image_path = efi_dp_from_file(NULL, 0, filename);
 341 }