14febfb8dSArd Biesheuvel // SPDX-License-Identifier: GPL-2.0 2f4f75ad5SArd Biesheuvel /* 3f4f75ad5SArd Biesheuvel * Helper functions used by the EFI stub on multiple 4f4f75ad5SArd Biesheuvel * architectures. This should be #included by the EFI stub 5f4f75ad5SArd Biesheuvel * implementation files. 6f4f75ad5SArd Biesheuvel * 7f4f75ad5SArd Biesheuvel * Copyright 2011 Intel Corporation; author Matt Fleming 8f4f75ad5SArd Biesheuvel */ 9f4f75ad5SArd Biesheuvel 10f4f75ad5SArd Biesheuvel #include <linux/efi.h> 11f4f75ad5SArd Biesheuvel #include <asm/efi.h> 12f4f75ad5SArd Biesheuvel 13f4f75ad5SArd Biesheuvel #include "efistub.h" 14f4f75ad5SArd Biesheuvel 155193a33dSArd Biesheuvel static bool __efistub_global efi_nochunk; 167d4e323dSArd Biesheuvel static bool __efistub_global efi_nokaslr; 1779d3219dSArd Biesheuvel static bool __efistub_global efi_noinitrd; 187d4e323dSArd Biesheuvel static bool __efistub_global efi_quiet; 197d4e323dSArd Biesheuvel static bool __efistub_global efi_novamap; 207d4e323dSArd Biesheuvel static bool __efistub_global efi_nosoftreserve; 214444f854SMatthew Garrett static bool __efistub_global efi_disable_pci_dma = 224444f854SMatthew Garrett IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA); 2360f38de7SArd Biesheuvel 245193a33dSArd Biesheuvel bool __pure nochunk(void) 255193a33dSArd Biesheuvel { 265193a33dSArd Biesheuvel return efi_nochunk; 275193a33dSArd Biesheuvel } 287d4e323dSArd Biesheuvel bool __pure nokaslr(void) 2960f38de7SArd Biesheuvel { 307d4e323dSArd Biesheuvel return efi_nokaslr; 3160f38de7SArd Biesheuvel } 3279d3219dSArd Biesheuvel bool __pure noinitrd(void) 3379d3219dSArd Biesheuvel { 3479d3219dSArd Biesheuvel return efi_noinitrd; 3579d3219dSArd Biesheuvel } 367d4e323dSArd Biesheuvel bool __pure is_quiet(void) 37eeff7d63SArd Biesheuvel { 387d4e323dSArd Biesheuvel return efi_quiet; 39eeff7d63SArd Biesheuvel } 407d4e323dSArd Biesheuvel bool __pure novamap(void) 414e46c2a9SArd Biesheuvel { 427d4e323dSArd Biesheuvel return efi_novamap; 434e46c2a9SArd Biesheuvel } 44b617c526SDan Williams bool __pure __efi_soft_reserve_enabled(void) 45b617c526SDan Williams { 46b617c526SDan Williams return !efi_nosoftreserve; 47b617c526SDan Williams } 4860f38de7SArd Biesheuvel 498173ec79SArd Biesheuvel void efi_printk(char *str) 50f4f75ad5SArd Biesheuvel { 51f4f75ad5SArd Biesheuvel char *s8; 52f4f75ad5SArd Biesheuvel 53f4f75ad5SArd Biesheuvel for (s8 = str; *s8; s8++) { 54f4f75ad5SArd Biesheuvel efi_char16_t ch[2] = { 0 }; 55f4f75ad5SArd Biesheuvel 56f4f75ad5SArd Biesheuvel ch[0] = *s8; 57f4f75ad5SArd Biesheuvel if (*s8 == '\n') { 58f4f75ad5SArd Biesheuvel efi_char16_t nl[2] = { '\r', 0 }; 598173ec79SArd Biesheuvel efi_char16_printk(nl); 60f4f75ad5SArd Biesheuvel } 61f4f75ad5SArd Biesheuvel 628173ec79SArd Biesheuvel efi_char16_printk(ch); 63f4f75ad5SArd Biesheuvel } 64f4f75ad5SArd Biesheuvel } 65f4f75ad5SArd Biesheuvel 665a17dae4SMatt Fleming /* 675a17dae4SMatt Fleming * Parse the ASCII string 'cmdline' for EFI options, denoted by the efi= 685a17dae4SMatt Fleming * option, e.g. efi=nochunk. 695a17dae4SMatt Fleming * 705a17dae4SMatt Fleming * It should be noted that efi= is parsed in two very different 715a17dae4SMatt Fleming * environments, first in the early boot environment of the EFI boot 725a17dae4SMatt Fleming * stub, and subsequently during the kernel boot. 735a17dae4SMatt Fleming */ 7460f38de7SArd Biesheuvel efi_status_t efi_parse_options(char const *cmdline) 755a17dae4SMatt Fleming { 7691d150c0SArd Biesheuvel size_t len = strlen(cmdline) + 1; 7791d150c0SArd Biesheuvel efi_status_t status; 7891d150c0SArd Biesheuvel char *str, *buf; 795a17dae4SMatt Fleming 8091d150c0SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf); 8191d150c0SArd Biesheuvel if (status != EFI_SUCCESS) 8291d150c0SArd Biesheuvel return status; 8391d150c0SArd Biesheuvel 8491d150c0SArd Biesheuvel str = skip_spaces(memcpy(buf, cmdline, len)); 8591d150c0SArd Biesheuvel 8691d150c0SArd Biesheuvel while (*str) { 8791d150c0SArd Biesheuvel char *param, *val; 8891d150c0SArd Biesheuvel 8991d150c0SArd Biesheuvel str = next_arg(str, ¶m, &val); 9091d150c0SArd Biesheuvel 9191d150c0SArd Biesheuvel if (!strcmp(param, "nokaslr")) { 927d4e323dSArd Biesheuvel efi_nokaslr = true; 9391d150c0SArd Biesheuvel } else if (!strcmp(param, "quiet")) { 947d4e323dSArd Biesheuvel efi_quiet = true; 9579d3219dSArd Biesheuvel } else if (!strcmp(param, "noinitrd")) { 9679d3219dSArd Biesheuvel efi_noinitrd = true; 9791d150c0SArd Biesheuvel } else if (!strcmp(param, "efi") && val) { 9891d150c0SArd Biesheuvel efi_nochunk = parse_option_str(val, "nochunk"); 9991d150c0SArd Biesheuvel efi_novamap = parse_option_str(val, "novamap"); 100eeff7d63SArd Biesheuvel 10191d150c0SArd Biesheuvel efi_nosoftreserve = IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) && 10291d150c0SArd Biesheuvel parse_option_str(val, "nosoftreserve"); 1035a17dae4SMatt Fleming 10491d150c0SArd Biesheuvel if (parse_option_str(val, "disable_early_pci_dma")) 1054444f854SMatthew Garrett efi_disable_pci_dma = true; 10691d150c0SArd Biesheuvel if (parse_option_str(val, "no_disable_early_pci_dma")) 1074444f854SMatthew Garrett efi_disable_pci_dma = false; 108fffb6804SArvind Sankar } else if (!strcmp(param, "video") && 109fffb6804SArvind Sankar val && strstarts(val, "efifb:")) { 110fffb6804SArvind Sankar efi_parse_option_graphics(val + strlen("efifb:")); 1114444f854SMatthew Garrett } 1125a17dae4SMatt Fleming } 11391d150c0SArd Biesheuvel efi_bs_call(free_pool, buf); 1145a17dae4SMatt Fleming return EFI_SUCCESS; 1155a17dae4SMatt Fleming } 116f4f75ad5SArd Biesheuvel 117f4f75ad5SArd Biesheuvel /* 118f4f75ad5SArd Biesheuvel * Get the number of UTF-8 bytes corresponding to an UTF-16 character. 119f4f75ad5SArd Biesheuvel * This overestimates for surrogates, but that is okay. 120f4f75ad5SArd Biesheuvel */ 121f4f75ad5SArd Biesheuvel static int efi_utf8_bytes(u16 c) 122f4f75ad5SArd Biesheuvel { 123f4f75ad5SArd Biesheuvel return 1 + (c >= 0x80) + (c >= 0x800); 124f4f75ad5SArd Biesheuvel } 125f4f75ad5SArd Biesheuvel 126f4f75ad5SArd Biesheuvel /* 127f4f75ad5SArd Biesheuvel * Convert an UTF-16 string, not necessarily null terminated, to UTF-8. 128f4f75ad5SArd Biesheuvel */ 129f4f75ad5SArd Biesheuvel static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n) 130f4f75ad5SArd Biesheuvel { 131f4f75ad5SArd Biesheuvel unsigned int c; 132f4f75ad5SArd Biesheuvel 133f4f75ad5SArd Biesheuvel while (n--) { 134f4f75ad5SArd Biesheuvel c = *src++; 135f4f75ad5SArd Biesheuvel if (n && c >= 0xd800 && c <= 0xdbff && 136f4f75ad5SArd Biesheuvel *src >= 0xdc00 && *src <= 0xdfff) { 137f4f75ad5SArd Biesheuvel c = 0x10000 + ((c & 0x3ff) << 10) + (*src & 0x3ff); 138f4f75ad5SArd Biesheuvel src++; 139f4f75ad5SArd Biesheuvel n--; 140f4f75ad5SArd Biesheuvel } 141f4f75ad5SArd Biesheuvel if (c >= 0xd800 && c <= 0xdfff) 142f4f75ad5SArd Biesheuvel c = 0xfffd; /* Unmatched surrogate */ 143f4f75ad5SArd Biesheuvel if (c < 0x80) { 144f4f75ad5SArd Biesheuvel *dst++ = c; 145f4f75ad5SArd Biesheuvel continue; 146f4f75ad5SArd Biesheuvel } 147f4f75ad5SArd Biesheuvel if (c < 0x800) { 148f4f75ad5SArd Biesheuvel *dst++ = 0xc0 + (c >> 6); 149f4f75ad5SArd Biesheuvel goto t1; 150f4f75ad5SArd Biesheuvel } 151f4f75ad5SArd Biesheuvel if (c < 0x10000) { 152f4f75ad5SArd Biesheuvel *dst++ = 0xe0 + (c >> 12); 153f4f75ad5SArd Biesheuvel goto t2; 154f4f75ad5SArd Biesheuvel } 155f4f75ad5SArd Biesheuvel *dst++ = 0xf0 + (c >> 18); 156f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 12) & 0x3f); 157f4f75ad5SArd Biesheuvel t2: 158f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 6) & 0x3f); 159f4f75ad5SArd Biesheuvel t1: 160f4f75ad5SArd Biesheuvel *dst++ = 0x80 + (c & 0x3f); 161f4f75ad5SArd Biesheuvel } 162f4f75ad5SArd Biesheuvel 163f4f75ad5SArd Biesheuvel return dst; 164f4f75ad5SArd Biesheuvel } 165f4f75ad5SArd Biesheuvel 166f4f75ad5SArd Biesheuvel /* 167f4f75ad5SArd Biesheuvel * Convert the unicode UEFI command line to ASCII to pass to kernel. 168f4f75ad5SArd Biesheuvel * Size of memory allocated return in *cmd_line_len. 169f4f75ad5SArd Biesheuvel * Returns NULL on error. 170f4f75ad5SArd Biesheuvel */ 171cd33a5c1SArd Biesheuvel char *efi_convert_cmdline(efi_loaded_image_t *image, 1721e45bf73SArd Biesheuvel int *cmd_line_len, unsigned long max_addr) 173f4f75ad5SArd Biesheuvel { 174f4f75ad5SArd Biesheuvel const u16 *s2; 175f4f75ad5SArd Biesheuvel u8 *s1 = NULL; 176f4f75ad5SArd Biesheuvel unsigned long cmdline_addr = 0; 177f7b85b33SArd Biesheuvel int load_options_chars = efi_table_attr(image, load_options_size) / 2; 178f7b85b33SArd Biesheuvel const u16 *options = efi_table_attr(image, load_options); 179f4f75ad5SArd Biesheuvel int options_bytes = 0; /* UTF-8 bytes */ 180f4f75ad5SArd Biesheuvel int options_chars = 0; /* UTF-16 chars */ 181f4f75ad5SArd Biesheuvel efi_status_t status; 182f4f75ad5SArd Biesheuvel u16 zero = 0; 183f4f75ad5SArd Biesheuvel 184f4f75ad5SArd Biesheuvel if (options) { 185f4f75ad5SArd Biesheuvel s2 = options; 186f4f75ad5SArd Biesheuvel while (*s2 && *s2 != '\n' 187f4f75ad5SArd Biesheuvel && options_chars < load_options_chars) { 188f4f75ad5SArd Biesheuvel options_bytes += efi_utf8_bytes(*s2++); 189f4f75ad5SArd Biesheuvel options_chars++; 190f4f75ad5SArd Biesheuvel } 191f4f75ad5SArd Biesheuvel } 192f4f75ad5SArd Biesheuvel 193f4f75ad5SArd Biesheuvel if (!options_chars) { 194f4f75ad5SArd Biesheuvel /* No command line options, so return empty string*/ 195f4f75ad5SArd Biesheuvel options = &zero; 196f4f75ad5SArd Biesheuvel } 197f4f75ad5SArd Biesheuvel 198f4f75ad5SArd Biesheuvel options_bytes++; /* NUL termination */ 199f4f75ad5SArd Biesheuvel 2001e45bf73SArd Biesheuvel status = efi_allocate_pages(options_bytes, &cmdline_addr, max_addr); 201f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 202f4f75ad5SArd Biesheuvel return NULL; 203f4f75ad5SArd Biesheuvel 204f4f75ad5SArd Biesheuvel s1 = (u8 *)cmdline_addr; 205f4f75ad5SArd Biesheuvel s2 = (const u16 *)options; 206f4f75ad5SArd Biesheuvel 207f4f75ad5SArd Biesheuvel s1 = efi_utf16_to_utf8(s1, s2, options_chars); 208f4f75ad5SArd Biesheuvel *s1 = '\0'; 209f4f75ad5SArd Biesheuvel 210f4f75ad5SArd Biesheuvel *cmd_line_len = options_bytes; 211f4f75ad5SArd Biesheuvel return (char *)cmdline_addr; 212f4f75ad5SArd Biesheuvel } 213fc07716bSJeffrey Hugo 214fc07716bSJeffrey Hugo /* 215fc07716bSJeffrey Hugo * Handle calling ExitBootServices according to the requirements set out by the 216fc07716bSJeffrey Hugo * spec. Obtains the current memory map, and returns that info after calling 217fc07716bSJeffrey Hugo * ExitBootServices. The client must specify a function to perform any 218fc07716bSJeffrey Hugo * processing of the memory map data prior to ExitBootServices. A client 219fc07716bSJeffrey Hugo * specific structure may be passed to the function via priv. The client 220fc07716bSJeffrey Hugo * function may be called multiple times. 221fc07716bSJeffrey Hugo */ 222cd33a5c1SArd Biesheuvel efi_status_t efi_exit_boot_services(void *handle, 223fc07716bSJeffrey Hugo struct efi_boot_memmap *map, 224fc07716bSJeffrey Hugo void *priv, 225fc07716bSJeffrey Hugo efi_exit_boot_map_processing priv_func) 226fc07716bSJeffrey Hugo { 227fc07716bSJeffrey Hugo efi_status_t status; 228fc07716bSJeffrey Hugo 229cd33a5c1SArd Biesheuvel status = efi_get_memory_map(map); 230fc07716bSJeffrey Hugo 231fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 232fc07716bSJeffrey Hugo goto fail; 233fc07716bSJeffrey Hugo 234cd33a5c1SArd Biesheuvel status = priv_func(map, priv); 235fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 236fc07716bSJeffrey Hugo goto free_map; 237fc07716bSJeffrey Hugo 2384444f854SMatthew Garrett if (efi_disable_pci_dma) 2394444f854SMatthew Garrett efi_pci_disable_bridge_busmaster(); 2404444f854SMatthew Garrett 241966291f6SArd Biesheuvel status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); 242fc07716bSJeffrey Hugo 243fc07716bSJeffrey Hugo if (status == EFI_INVALID_PARAMETER) { 244fc07716bSJeffrey Hugo /* 245fc07716bSJeffrey Hugo * The memory map changed between efi_get_memory_map() and 246fc07716bSJeffrey Hugo * exit_boot_services(). Per the UEFI Spec v2.6, Section 6.4: 247fc07716bSJeffrey Hugo * EFI_BOOT_SERVICES.ExitBootServices we need to get the 248fc07716bSJeffrey Hugo * updated map, and try again. The spec implies one retry 249fc07716bSJeffrey Hugo * should be sufficent, which is confirmed against the EDK2 250fc07716bSJeffrey Hugo * implementation. Per the spec, we can only invoke 251fc07716bSJeffrey Hugo * get_memory_map() and exit_boot_services() - we cannot alloc 252fc07716bSJeffrey Hugo * so efi_get_memory_map() cannot be used, and we must reuse 253fc07716bSJeffrey Hugo * the buffer. For all practical purposes, the headroom in the 254fc07716bSJeffrey Hugo * buffer should account for any changes in the map so the call 255fc07716bSJeffrey Hugo * to get_memory_map() is expected to succeed here. 256fc07716bSJeffrey Hugo */ 257fc07716bSJeffrey Hugo *map->map_size = *map->buff_size; 258966291f6SArd Biesheuvel status = efi_bs_call(get_memory_map, 259fc07716bSJeffrey Hugo map->map_size, 260fc07716bSJeffrey Hugo *map->map, 261fc07716bSJeffrey Hugo map->key_ptr, 262fc07716bSJeffrey Hugo map->desc_size, 263fc07716bSJeffrey Hugo map->desc_ver); 264fc07716bSJeffrey Hugo 265fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 266fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 267fc07716bSJeffrey Hugo goto fail; 268fc07716bSJeffrey Hugo 269cd33a5c1SArd Biesheuvel status = priv_func(map, priv); 270fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 271fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 272fc07716bSJeffrey Hugo goto fail; 273fc07716bSJeffrey Hugo 274966291f6SArd Biesheuvel status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); 275fc07716bSJeffrey Hugo } 276fc07716bSJeffrey Hugo 277fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 278fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 279fc07716bSJeffrey Hugo goto fail; 280fc07716bSJeffrey Hugo 281fc07716bSJeffrey Hugo return EFI_SUCCESS; 282fc07716bSJeffrey Hugo 283fc07716bSJeffrey Hugo free_map: 284966291f6SArd Biesheuvel efi_bs_call(free_pool, *map->map); 285fc07716bSJeffrey Hugo fail: 286fc07716bSJeffrey Hugo return status; 287fc07716bSJeffrey Hugo } 28882d736acSMatthew Garrett 289cd33a5c1SArd Biesheuvel void *get_efi_config_table(efi_guid_t guid) 29082d736acSMatthew Garrett { 29199ea8b1dSArd Biesheuvel unsigned long tables = efi_table_attr(efi_system_table(), tables); 29299ea8b1dSArd Biesheuvel int nr_tables = efi_table_attr(efi_system_table(), nr_tables); 293f958efe9SArd Biesheuvel int i; 294f958efe9SArd Biesheuvel 295f958efe9SArd Biesheuvel for (i = 0; i < nr_tables; i++) { 296f958efe9SArd Biesheuvel efi_config_table_t *t = (void *)tables; 297f958efe9SArd Biesheuvel 298f958efe9SArd Biesheuvel if (efi_guidcmp(t->guid, guid) == 0) 29999ea8b1dSArd Biesheuvel return efi_table_attr(t, table); 300f958efe9SArd Biesheuvel 301f958efe9SArd Biesheuvel tables += efi_is_native() ? sizeof(efi_config_table_t) 302f958efe9SArd Biesheuvel : sizeof(efi_config_table_32_t); 303f958efe9SArd Biesheuvel } 304f958efe9SArd Biesheuvel return NULL; 30582d736acSMatthew Garrett } 306dc29da14SArd Biesheuvel 3078173ec79SArd Biesheuvel void efi_char16_printk(efi_char16_t *str) 308dc29da14SArd Biesheuvel { 30999ea8b1dSArd Biesheuvel efi_call_proto(efi_table_attr(efi_system_table(), con_out), 31047c0fd39SArd Biesheuvel output_string, str); 311dc29da14SArd Biesheuvel } 312ec93fc37SArd Biesheuvel 313ec93fc37SArd Biesheuvel /* 314ec93fc37SArd Biesheuvel * The LINUX_EFI_INITRD_MEDIA_GUID vendor media device path below provides a way 315ec93fc37SArd Biesheuvel * for the firmware or bootloader to expose the initrd data directly to the stub 316ec93fc37SArd Biesheuvel * via the trivial LoadFile2 protocol, which is defined in the UEFI spec, and is 317ec93fc37SArd Biesheuvel * very easy to implement. It is a simple Linux initrd specific conduit between 318ec93fc37SArd Biesheuvel * kernel and firmware, allowing us to put the EFI stub (being part of the 319ec93fc37SArd Biesheuvel * kernel) in charge of where and when to load the initrd, while leaving it up 320ec93fc37SArd Biesheuvel * to the firmware to decide whether it needs to expose its filesystem hierarchy 321ec93fc37SArd Biesheuvel * via EFI protocols. 322ec93fc37SArd Biesheuvel */ 323ec93fc37SArd Biesheuvel static const struct { 324ec93fc37SArd Biesheuvel struct efi_vendor_dev_path vendor; 325ec93fc37SArd Biesheuvel struct efi_generic_dev_path end; 326ec93fc37SArd Biesheuvel } __packed initrd_dev_path = { 327ec93fc37SArd Biesheuvel { 328ec93fc37SArd Biesheuvel { 329ec93fc37SArd Biesheuvel EFI_DEV_MEDIA, 330ec93fc37SArd Biesheuvel EFI_DEV_MEDIA_VENDOR, 331ec93fc37SArd Biesheuvel sizeof(struct efi_vendor_dev_path), 332ec93fc37SArd Biesheuvel }, 333ec93fc37SArd Biesheuvel LINUX_EFI_INITRD_MEDIA_GUID 334ec93fc37SArd Biesheuvel }, { 335ec93fc37SArd Biesheuvel EFI_DEV_END_PATH, 336ec93fc37SArd Biesheuvel EFI_DEV_END_ENTIRE, 337ec93fc37SArd Biesheuvel sizeof(struct efi_generic_dev_path) 338ec93fc37SArd Biesheuvel } 339ec93fc37SArd Biesheuvel }; 340ec93fc37SArd Biesheuvel 341ec93fc37SArd Biesheuvel /** 342ec93fc37SArd Biesheuvel * efi_load_initrd_dev_path - load the initrd from the Linux initrd device path 343ec93fc37SArd Biesheuvel * @load_addr: pointer to store the address where the initrd was loaded 344ec93fc37SArd Biesheuvel * @load_size: pointer to store the size of the loaded initrd 345ec93fc37SArd Biesheuvel * @max: upper limit for the initrd memory allocation 346ec93fc37SArd Biesheuvel * @return: %EFI_SUCCESS if the initrd was loaded successfully, in which 347ec93fc37SArd Biesheuvel * case @load_addr and @load_size are assigned accordingly 348ec93fc37SArd Biesheuvel * %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd 349ec93fc37SArd Biesheuvel * device path 350ec93fc37SArd Biesheuvel * %EFI_INVALID_PARAMETER if load_addr == NULL or load_size == NULL 351ec93fc37SArd Biesheuvel * %EFI_OUT_OF_RESOURCES if memory allocation failed 352ec93fc37SArd Biesheuvel * %EFI_LOAD_ERROR in all other cases 353ec93fc37SArd Biesheuvel */ 354ec93fc37SArd Biesheuvel efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr, 355ec93fc37SArd Biesheuvel unsigned long *load_size, 356ec93fc37SArd Biesheuvel unsigned long max) 357ec93fc37SArd Biesheuvel { 358ec93fc37SArd Biesheuvel efi_guid_t lf2_proto_guid = EFI_LOAD_FILE2_PROTOCOL_GUID; 359ec93fc37SArd Biesheuvel efi_device_path_protocol_t *dp; 360ec93fc37SArd Biesheuvel efi_load_file2_protocol_t *lf2; 361ec93fc37SArd Biesheuvel unsigned long initrd_addr; 362ec93fc37SArd Biesheuvel unsigned long initrd_size; 363ec93fc37SArd Biesheuvel efi_handle_t handle; 364ec93fc37SArd Biesheuvel efi_status_t status; 365ec93fc37SArd Biesheuvel 366ec93fc37SArd Biesheuvel if (!load_addr || !load_size) 367ec93fc37SArd Biesheuvel return EFI_INVALID_PARAMETER; 368ec93fc37SArd Biesheuvel 369ec93fc37SArd Biesheuvel dp = (efi_device_path_protocol_t *)&initrd_dev_path; 370ec93fc37SArd Biesheuvel status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle); 371ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 372ec93fc37SArd Biesheuvel return status; 373ec93fc37SArd Biesheuvel 374ec93fc37SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, &lf2_proto_guid, 375ec93fc37SArd Biesheuvel (void **)&lf2); 376ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 377ec93fc37SArd Biesheuvel return status; 378ec93fc37SArd Biesheuvel 379ec93fc37SArd Biesheuvel status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, NULL); 380ec93fc37SArd Biesheuvel if (status != EFI_BUFFER_TOO_SMALL) 381ec93fc37SArd Biesheuvel return EFI_LOAD_ERROR; 382ec93fc37SArd Biesheuvel 383ec93fc37SArd Biesheuvel status = efi_allocate_pages(initrd_size, &initrd_addr, max); 384ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 385ec93fc37SArd Biesheuvel return status; 386ec93fc37SArd Biesheuvel 387ec93fc37SArd Biesheuvel status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, 388ec93fc37SArd Biesheuvel (void *)initrd_addr); 389ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) { 390ec93fc37SArd Biesheuvel efi_free(initrd_size, initrd_addr); 391ec93fc37SArd Biesheuvel return EFI_LOAD_ERROR; 392ec93fc37SArd Biesheuvel } 393ec93fc37SArd Biesheuvel 394ec93fc37SArd Biesheuvel *load_addr = initrd_addr; 395ec93fc37SArd Biesheuvel *load_size = initrd_size; 396ec93fc37SArd Biesheuvel return EFI_SUCCESS; 397ec93fc37SArd Biesheuvel } 398