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 1554439370SArvind Sankar static bool efi_nochunk; 1654439370SArvind Sankar static bool efi_nokaslr; 1754439370SArvind Sankar static bool efi_noinitrd; 1854439370SArvind Sankar static bool efi_quiet; 1954439370SArvind Sankar static bool efi_novamap; 2054439370SArvind Sankar static bool efi_nosoftreserve; 2154439370SArvind Sankar static bool efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA); 2260f38de7SArd Biesheuvel 235193a33dSArd Biesheuvel bool __pure nochunk(void) 245193a33dSArd Biesheuvel { 255193a33dSArd Biesheuvel return efi_nochunk; 265193a33dSArd Biesheuvel } 277d4e323dSArd Biesheuvel bool __pure nokaslr(void) 2860f38de7SArd Biesheuvel { 297d4e323dSArd Biesheuvel return efi_nokaslr; 3060f38de7SArd Biesheuvel } 3179d3219dSArd Biesheuvel bool __pure noinitrd(void) 3279d3219dSArd Biesheuvel { 3379d3219dSArd Biesheuvel return efi_noinitrd; 3479d3219dSArd Biesheuvel } 357d4e323dSArd Biesheuvel bool __pure is_quiet(void) 36eeff7d63SArd Biesheuvel { 377d4e323dSArd Biesheuvel return efi_quiet; 38eeff7d63SArd Biesheuvel } 397d4e323dSArd Biesheuvel bool __pure novamap(void) 404e46c2a9SArd Biesheuvel { 417d4e323dSArd Biesheuvel return efi_novamap; 424e46c2a9SArd Biesheuvel } 43b617c526SDan Williams bool __pure __efi_soft_reserve_enabled(void) 44b617c526SDan Williams { 45b617c526SDan Williams return !efi_nosoftreserve; 46b617c526SDan Williams } 4760f38de7SArd Biesheuvel 488173ec79SArd Biesheuvel void efi_printk(char *str) 49f4f75ad5SArd Biesheuvel { 50f4f75ad5SArd Biesheuvel char *s8; 51f4f75ad5SArd Biesheuvel 52f4f75ad5SArd Biesheuvel for (s8 = str; *s8; s8++) { 53f4f75ad5SArd Biesheuvel efi_char16_t ch[2] = { 0 }; 54f4f75ad5SArd Biesheuvel 55f4f75ad5SArd Biesheuvel ch[0] = *s8; 56f4f75ad5SArd Biesheuvel if (*s8 == '\n') { 57f4f75ad5SArd Biesheuvel efi_char16_t nl[2] = { '\r', 0 }; 588173ec79SArd Biesheuvel efi_char16_printk(nl); 59f4f75ad5SArd Biesheuvel } 60f4f75ad5SArd Biesheuvel 618173ec79SArd Biesheuvel efi_char16_printk(ch); 62f4f75ad5SArd Biesheuvel } 63f4f75ad5SArd Biesheuvel } 64f4f75ad5SArd Biesheuvel 655a17dae4SMatt Fleming /* 665a17dae4SMatt Fleming * Parse the ASCII string 'cmdline' for EFI options, denoted by the efi= 675a17dae4SMatt Fleming * option, e.g. efi=nochunk. 685a17dae4SMatt Fleming * 695a17dae4SMatt Fleming * It should be noted that efi= is parsed in two very different 705a17dae4SMatt Fleming * environments, first in the early boot environment of the EFI boot 715a17dae4SMatt Fleming * stub, and subsequently during the kernel boot. 725a17dae4SMatt Fleming */ 7360f38de7SArd Biesheuvel efi_status_t efi_parse_options(char const *cmdline) 745a17dae4SMatt Fleming { 7591d150c0SArd Biesheuvel size_t len = strlen(cmdline) + 1; 7691d150c0SArd Biesheuvel efi_status_t status; 7791d150c0SArd Biesheuvel char *str, *buf; 785a17dae4SMatt Fleming 7991d150c0SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf); 8091d150c0SArd Biesheuvel if (status != EFI_SUCCESS) 8191d150c0SArd Biesheuvel return status; 8291d150c0SArd Biesheuvel 8391d150c0SArd Biesheuvel str = skip_spaces(memcpy(buf, cmdline, len)); 8491d150c0SArd Biesheuvel 8591d150c0SArd Biesheuvel while (*str) { 8691d150c0SArd Biesheuvel char *param, *val; 8791d150c0SArd Biesheuvel 8891d150c0SArd Biesheuvel str = next_arg(str, ¶m, &val); 8991d150c0SArd Biesheuvel 9091d150c0SArd Biesheuvel if (!strcmp(param, "nokaslr")) { 917d4e323dSArd Biesheuvel efi_nokaslr = true; 9291d150c0SArd Biesheuvel } else if (!strcmp(param, "quiet")) { 937d4e323dSArd Biesheuvel efi_quiet = true; 9479d3219dSArd Biesheuvel } else if (!strcmp(param, "noinitrd")) { 9579d3219dSArd Biesheuvel efi_noinitrd = true; 9691d150c0SArd Biesheuvel } else if (!strcmp(param, "efi") && val) { 9791d150c0SArd Biesheuvel efi_nochunk = parse_option_str(val, "nochunk"); 9891d150c0SArd Biesheuvel efi_novamap = parse_option_str(val, "novamap"); 99eeff7d63SArd Biesheuvel 10091d150c0SArd Biesheuvel efi_nosoftreserve = IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) && 10191d150c0SArd Biesheuvel parse_option_str(val, "nosoftreserve"); 1025a17dae4SMatt Fleming 10391d150c0SArd Biesheuvel if (parse_option_str(val, "disable_early_pci_dma")) 1044444f854SMatthew Garrett efi_disable_pci_dma = true; 10591d150c0SArd Biesheuvel if (parse_option_str(val, "no_disable_early_pci_dma")) 1064444f854SMatthew Garrett efi_disable_pci_dma = false; 107fffb6804SArvind Sankar } else if (!strcmp(param, "video") && 108fffb6804SArvind Sankar val && strstarts(val, "efifb:")) { 109fffb6804SArvind Sankar efi_parse_option_graphics(val + strlen("efifb:")); 1104444f854SMatthew Garrett } 1115a17dae4SMatt Fleming } 11291d150c0SArd Biesheuvel efi_bs_call(free_pool, buf); 1135a17dae4SMatt Fleming return EFI_SUCCESS; 1145a17dae4SMatt Fleming } 115f4f75ad5SArd Biesheuvel 116f4f75ad5SArd Biesheuvel /* 117f4f75ad5SArd Biesheuvel * Get the number of UTF-8 bytes corresponding to an UTF-16 character. 118f4f75ad5SArd Biesheuvel * This overestimates for surrogates, but that is okay. 119f4f75ad5SArd Biesheuvel */ 120f4f75ad5SArd Biesheuvel static int efi_utf8_bytes(u16 c) 121f4f75ad5SArd Biesheuvel { 122f4f75ad5SArd Biesheuvel return 1 + (c >= 0x80) + (c >= 0x800); 123f4f75ad5SArd Biesheuvel } 124f4f75ad5SArd Biesheuvel 125f4f75ad5SArd Biesheuvel /* 126f4f75ad5SArd Biesheuvel * Convert an UTF-16 string, not necessarily null terminated, to UTF-8. 127f4f75ad5SArd Biesheuvel */ 128f4f75ad5SArd Biesheuvel static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n) 129f4f75ad5SArd Biesheuvel { 130f4f75ad5SArd Biesheuvel unsigned int c; 131f4f75ad5SArd Biesheuvel 132f4f75ad5SArd Biesheuvel while (n--) { 133f4f75ad5SArd Biesheuvel c = *src++; 134f4f75ad5SArd Biesheuvel if (n && c >= 0xd800 && c <= 0xdbff && 135f4f75ad5SArd Biesheuvel *src >= 0xdc00 && *src <= 0xdfff) { 136f4f75ad5SArd Biesheuvel c = 0x10000 + ((c & 0x3ff) << 10) + (*src & 0x3ff); 137f4f75ad5SArd Biesheuvel src++; 138f4f75ad5SArd Biesheuvel n--; 139f4f75ad5SArd Biesheuvel } 140f4f75ad5SArd Biesheuvel if (c >= 0xd800 && c <= 0xdfff) 141f4f75ad5SArd Biesheuvel c = 0xfffd; /* Unmatched surrogate */ 142f4f75ad5SArd Biesheuvel if (c < 0x80) { 143f4f75ad5SArd Biesheuvel *dst++ = c; 144f4f75ad5SArd Biesheuvel continue; 145f4f75ad5SArd Biesheuvel } 146f4f75ad5SArd Biesheuvel if (c < 0x800) { 147f4f75ad5SArd Biesheuvel *dst++ = 0xc0 + (c >> 6); 148f4f75ad5SArd Biesheuvel goto t1; 149f4f75ad5SArd Biesheuvel } 150f4f75ad5SArd Biesheuvel if (c < 0x10000) { 151f4f75ad5SArd Biesheuvel *dst++ = 0xe0 + (c >> 12); 152f4f75ad5SArd Biesheuvel goto t2; 153f4f75ad5SArd Biesheuvel } 154f4f75ad5SArd Biesheuvel *dst++ = 0xf0 + (c >> 18); 155f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 12) & 0x3f); 156f4f75ad5SArd Biesheuvel t2: 157f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 6) & 0x3f); 158f4f75ad5SArd Biesheuvel t1: 159f4f75ad5SArd Biesheuvel *dst++ = 0x80 + (c & 0x3f); 160f4f75ad5SArd Biesheuvel } 161f4f75ad5SArd Biesheuvel 162f4f75ad5SArd Biesheuvel return dst; 163f4f75ad5SArd Biesheuvel } 164f4f75ad5SArd Biesheuvel 165f4f75ad5SArd Biesheuvel /* 166f4f75ad5SArd Biesheuvel * Convert the unicode UEFI command line to ASCII to pass to kernel. 167f4f75ad5SArd Biesheuvel * Size of memory allocated return in *cmd_line_len. 168f4f75ad5SArd Biesheuvel * Returns NULL on error. 169f4f75ad5SArd Biesheuvel */ 170cd33a5c1SArd Biesheuvel char *efi_convert_cmdline(efi_loaded_image_t *image, 1711e45bf73SArd Biesheuvel int *cmd_line_len, unsigned long max_addr) 172f4f75ad5SArd Biesheuvel { 173f4f75ad5SArd Biesheuvel const u16 *s2; 174f4f75ad5SArd Biesheuvel u8 *s1 = NULL; 175f4f75ad5SArd Biesheuvel unsigned long cmdline_addr = 0; 176f7b85b33SArd Biesheuvel int load_options_chars = efi_table_attr(image, load_options_size) / 2; 177f7b85b33SArd Biesheuvel const u16 *options = efi_table_attr(image, load_options); 178f4f75ad5SArd Biesheuvel int options_bytes = 0; /* UTF-8 bytes */ 179f4f75ad5SArd Biesheuvel int options_chars = 0; /* UTF-16 chars */ 180f4f75ad5SArd Biesheuvel efi_status_t status; 181f4f75ad5SArd Biesheuvel u16 zero = 0; 182f4f75ad5SArd Biesheuvel 183f4f75ad5SArd Biesheuvel if (options) { 184f4f75ad5SArd Biesheuvel s2 = options; 185f4f75ad5SArd Biesheuvel while (*s2 && *s2 != '\n' 186f4f75ad5SArd Biesheuvel && options_chars < load_options_chars) { 187f4f75ad5SArd Biesheuvel options_bytes += efi_utf8_bytes(*s2++); 188f4f75ad5SArd Biesheuvel options_chars++; 189f4f75ad5SArd Biesheuvel } 190f4f75ad5SArd Biesheuvel } 191f4f75ad5SArd Biesheuvel 192f4f75ad5SArd Biesheuvel if (!options_chars) { 193f4f75ad5SArd Biesheuvel /* No command line options, so return empty string*/ 194f4f75ad5SArd Biesheuvel options = &zero; 195f4f75ad5SArd Biesheuvel } 196f4f75ad5SArd Biesheuvel 197f4f75ad5SArd Biesheuvel options_bytes++; /* NUL termination */ 198f4f75ad5SArd Biesheuvel 1991e45bf73SArd Biesheuvel status = efi_allocate_pages(options_bytes, &cmdline_addr, max_addr); 200f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 201f4f75ad5SArd Biesheuvel return NULL; 202f4f75ad5SArd Biesheuvel 203f4f75ad5SArd Biesheuvel s1 = (u8 *)cmdline_addr; 204f4f75ad5SArd Biesheuvel s2 = (const u16 *)options; 205f4f75ad5SArd Biesheuvel 206f4f75ad5SArd Biesheuvel s1 = efi_utf16_to_utf8(s1, s2, options_chars); 207f4f75ad5SArd Biesheuvel *s1 = '\0'; 208f4f75ad5SArd Biesheuvel 209f4f75ad5SArd Biesheuvel *cmd_line_len = options_bytes; 210f4f75ad5SArd Biesheuvel return (char *)cmdline_addr; 211f4f75ad5SArd Biesheuvel } 212fc07716bSJeffrey Hugo 213fc07716bSJeffrey Hugo /* 214fc07716bSJeffrey Hugo * Handle calling ExitBootServices according to the requirements set out by the 215fc07716bSJeffrey Hugo * spec. Obtains the current memory map, and returns that info after calling 216fc07716bSJeffrey Hugo * ExitBootServices. The client must specify a function to perform any 217fc07716bSJeffrey Hugo * processing of the memory map data prior to ExitBootServices. A client 218fc07716bSJeffrey Hugo * specific structure may be passed to the function via priv. The client 219fc07716bSJeffrey Hugo * function may be called multiple times. 220fc07716bSJeffrey Hugo */ 221cd33a5c1SArd Biesheuvel efi_status_t efi_exit_boot_services(void *handle, 222fc07716bSJeffrey Hugo struct efi_boot_memmap *map, 223fc07716bSJeffrey Hugo void *priv, 224fc07716bSJeffrey Hugo efi_exit_boot_map_processing priv_func) 225fc07716bSJeffrey Hugo { 226fc07716bSJeffrey Hugo efi_status_t status; 227fc07716bSJeffrey Hugo 228cd33a5c1SArd Biesheuvel status = efi_get_memory_map(map); 229fc07716bSJeffrey Hugo 230fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 231fc07716bSJeffrey Hugo goto fail; 232fc07716bSJeffrey Hugo 233cd33a5c1SArd Biesheuvel status = priv_func(map, priv); 234fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 235fc07716bSJeffrey Hugo goto free_map; 236fc07716bSJeffrey Hugo 2374444f854SMatthew Garrett if (efi_disable_pci_dma) 2384444f854SMatthew Garrett efi_pci_disable_bridge_busmaster(); 2394444f854SMatthew Garrett 240966291f6SArd Biesheuvel status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); 241fc07716bSJeffrey Hugo 242fc07716bSJeffrey Hugo if (status == EFI_INVALID_PARAMETER) { 243fc07716bSJeffrey Hugo /* 244fc07716bSJeffrey Hugo * The memory map changed between efi_get_memory_map() and 245fc07716bSJeffrey Hugo * exit_boot_services(). Per the UEFI Spec v2.6, Section 6.4: 246fc07716bSJeffrey Hugo * EFI_BOOT_SERVICES.ExitBootServices we need to get the 247fc07716bSJeffrey Hugo * updated map, and try again. The spec implies one retry 248fc07716bSJeffrey Hugo * should be sufficent, which is confirmed against the EDK2 249fc07716bSJeffrey Hugo * implementation. Per the spec, we can only invoke 250fc07716bSJeffrey Hugo * get_memory_map() and exit_boot_services() - we cannot alloc 251fc07716bSJeffrey Hugo * so efi_get_memory_map() cannot be used, and we must reuse 252fc07716bSJeffrey Hugo * the buffer. For all practical purposes, the headroom in the 253fc07716bSJeffrey Hugo * buffer should account for any changes in the map so the call 254fc07716bSJeffrey Hugo * to get_memory_map() is expected to succeed here. 255fc07716bSJeffrey Hugo */ 256fc07716bSJeffrey Hugo *map->map_size = *map->buff_size; 257966291f6SArd Biesheuvel status = efi_bs_call(get_memory_map, 258fc07716bSJeffrey Hugo map->map_size, 259fc07716bSJeffrey Hugo *map->map, 260fc07716bSJeffrey Hugo map->key_ptr, 261fc07716bSJeffrey Hugo map->desc_size, 262fc07716bSJeffrey Hugo map->desc_ver); 263fc07716bSJeffrey Hugo 264fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 265fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 266fc07716bSJeffrey Hugo goto fail; 267fc07716bSJeffrey Hugo 268cd33a5c1SArd Biesheuvel status = priv_func(map, priv); 269fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 270fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 271fc07716bSJeffrey Hugo goto fail; 272fc07716bSJeffrey Hugo 273966291f6SArd Biesheuvel status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); 274fc07716bSJeffrey Hugo } 275fc07716bSJeffrey Hugo 276fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 277fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 278fc07716bSJeffrey Hugo goto fail; 279fc07716bSJeffrey Hugo 280fc07716bSJeffrey Hugo return EFI_SUCCESS; 281fc07716bSJeffrey Hugo 282fc07716bSJeffrey Hugo free_map: 283966291f6SArd Biesheuvel efi_bs_call(free_pool, *map->map); 284fc07716bSJeffrey Hugo fail: 285fc07716bSJeffrey Hugo return status; 286fc07716bSJeffrey Hugo } 28782d736acSMatthew Garrett 288cd33a5c1SArd Biesheuvel void *get_efi_config_table(efi_guid_t guid) 28982d736acSMatthew Garrett { 290ccc27ae7SArd Biesheuvel unsigned long tables = efi_table_attr(efi_system_table, tables); 291ccc27ae7SArd Biesheuvel int nr_tables = efi_table_attr(efi_system_table, nr_tables); 292f958efe9SArd Biesheuvel int i; 293f958efe9SArd Biesheuvel 294f958efe9SArd Biesheuvel for (i = 0; i < nr_tables; i++) { 295f958efe9SArd Biesheuvel efi_config_table_t *t = (void *)tables; 296f958efe9SArd Biesheuvel 297f958efe9SArd Biesheuvel if (efi_guidcmp(t->guid, guid) == 0) 29899ea8b1dSArd Biesheuvel return efi_table_attr(t, table); 299f958efe9SArd Biesheuvel 300f958efe9SArd Biesheuvel tables += efi_is_native() ? sizeof(efi_config_table_t) 301f958efe9SArd Biesheuvel : sizeof(efi_config_table_32_t); 302f958efe9SArd Biesheuvel } 303f958efe9SArd Biesheuvel return NULL; 30482d736acSMatthew Garrett } 305dc29da14SArd Biesheuvel 3068173ec79SArd Biesheuvel void efi_char16_printk(efi_char16_t *str) 307dc29da14SArd Biesheuvel { 308ccc27ae7SArd Biesheuvel efi_call_proto(efi_table_attr(efi_system_table, con_out), 30947c0fd39SArd Biesheuvel output_string, str); 310dc29da14SArd Biesheuvel } 311ec93fc37SArd Biesheuvel 312ec93fc37SArd Biesheuvel /* 313ec93fc37SArd Biesheuvel * The LINUX_EFI_INITRD_MEDIA_GUID vendor media device path below provides a way 314ec93fc37SArd Biesheuvel * for the firmware or bootloader to expose the initrd data directly to the stub 315ec93fc37SArd Biesheuvel * via the trivial LoadFile2 protocol, which is defined in the UEFI spec, and is 316ec93fc37SArd Biesheuvel * very easy to implement. It is a simple Linux initrd specific conduit between 317ec93fc37SArd Biesheuvel * kernel and firmware, allowing us to put the EFI stub (being part of the 318ec93fc37SArd Biesheuvel * kernel) in charge of where and when to load the initrd, while leaving it up 319ec93fc37SArd Biesheuvel * to the firmware to decide whether it needs to expose its filesystem hierarchy 320ec93fc37SArd Biesheuvel * via EFI protocols. 321ec93fc37SArd Biesheuvel */ 322ec93fc37SArd Biesheuvel static const struct { 323ec93fc37SArd Biesheuvel struct efi_vendor_dev_path vendor; 324ec93fc37SArd Biesheuvel struct efi_generic_dev_path end; 325ec93fc37SArd Biesheuvel } __packed initrd_dev_path = { 326ec93fc37SArd Biesheuvel { 327ec93fc37SArd Biesheuvel { 328ec93fc37SArd Biesheuvel EFI_DEV_MEDIA, 329ec93fc37SArd Biesheuvel EFI_DEV_MEDIA_VENDOR, 330ec93fc37SArd Biesheuvel sizeof(struct efi_vendor_dev_path), 331ec93fc37SArd Biesheuvel }, 332ec93fc37SArd Biesheuvel LINUX_EFI_INITRD_MEDIA_GUID 333ec93fc37SArd Biesheuvel }, { 334ec93fc37SArd Biesheuvel EFI_DEV_END_PATH, 335ec93fc37SArd Biesheuvel EFI_DEV_END_ENTIRE, 336ec93fc37SArd Biesheuvel sizeof(struct efi_generic_dev_path) 337ec93fc37SArd Biesheuvel } 338ec93fc37SArd Biesheuvel }; 339ec93fc37SArd Biesheuvel 340ec93fc37SArd Biesheuvel /** 341ec93fc37SArd Biesheuvel * efi_load_initrd_dev_path - load the initrd from the Linux initrd device path 342ec93fc37SArd Biesheuvel * @load_addr: pointer to store the address where the initrd was loaded 343ec93fc37SArd Biesheuvel * @load_size: pointer to store the size of the loaded initrd 344ec93fc37SArd Biesheuvel * @max: upper limit for the initrd memory allocation 345ec93fc37SArd Biesheuvel * @return: %EFI_SUCCESS if the initrd was loaded successfully, in which 346ec93fc37SArd Biesheuvel * case @load_addr and @load_size are assigned accordingly 347ec93fc37SArd Biesheuvel * %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd 348ec93fc37SArd Biesheuvel * device path 349ec93fc37SArd Biesheuvel * %EFI_INVALID_PARAMETER if load_addr == NULL or load_size == NULL 350ec93fc37SArd Biesheuvel * %EFI_OUT_OF_RESOURCES if memory allocation failed 351ec93fc37SArd Biesheuvel * %EFI_LOAD_ERROR in all other cases 352ec93fc37SArd Biesheuvel */ 353ec93fc37SArd Biesheuvel efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr, 354ec93fc37SArd Biesheuvel unsigned long *load_size, 355ec93fc37SArd Biesheuvel unsigned long max) 356ec93fc37SArd Biesheuvel { 357ec93fc37SArd Biesheuvel efi_guid_t lf2_proto_guid = EFI_LOAD_FILE2_PROTOCOL_GUID; 358ec93fc37SArd Biesheuvel efi_device_path_protocol_t *dp; 359ec93fc37SArd Biesheuvel efi_load_file2_protocol_t *lf2; 360ec93fc37SArd Biesheuvel unsigned long initrd_addr; 361ec93fc37SArd Biesheuvel unsigned long initrd_size; 362ec93fc37SArd Biesheuvel efi_handle_t handle; 363ec93fc37SArd Biesheuvel efi_status_t status; 364ec93fc37SArd Biesheuvel 365ec93fc37SArd Biesheuvel if (!load_addr || !load_size) 366ec93fc37SArd Biesheuvel return EFI_INVALID_PARAMETER; 367ec93fc37SArd Biesheuvel 368ec93fc37SArd Biesheuvel dp = (efi_device_path_protocol_t *)&initrd_dev_path; 369ec93fc37SArd Biesheuvel status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle); 370ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 371ec93fc37SArd Biesheuvel return status; 372ec93fc37SArd Biesheuvel 373ec93fc37SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, &lf2_proto_guid, 374ec93fc37SArd Biesheuvel (void **)&lf2); 375ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 376ec93fc37SArd Biesheuvel return status; 377ec93fc37SArd Biesheuvel 378ec93fc37SArd Biesheuvel status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, NULL); 379ec93fc37SArd Biesheuvel if (status != EFI_BUFFER_TOO_SMALL) 380ec93fc37SArd Biesheuvel return EFI_LOAD_ERROR; 381ec93fc37SArd Biesheuvel 382ec93fc37SArd Biesheuvel status = efi_allocate_pages(initrd_size, &initrd_addr, max); 383ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 384ec93fc37SArd Biesheuvel return status; 385ec93fc37SArd Biesheuvel 386ec93fc37SArd Biesheuvel status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, 387ec93fc37SArd Biesheuvel (void *)initrd_addr); 388ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) { 389ec93fc37SArd Biesheuvel efi_free(initrd_size, initrd_addr); 390ec93fc37SArd Biesheuvel return EFI_LOAD_ERROR; 391ec93fc37SArd Biesheuvel } 392ec93fc37SArd Biesheuvel 393ec93fc37SArd Biesheuvel *load_addr = initrd_addr; 394ec93fc37SArd Biesheuvel *load_size = initrd_size; 395ec93fc37SArd Biesheuvel return EFI_SUCCESS; 396ec93fc37SArd Biesheuvel } 397