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 102c7d1e30SArvind Sankar #include <stdarg.h> 112c7d1e30SArvind Sankar 12f4f75ad5SArd Biesheuvel #include <linux/efi.h> 13fd0528a2SArvind Sankar #include <linux/kernel.h> 14f4f75ad5SArd Biesheuvel #include <asm/efi.h> 15f4f75ad5SArd Biesheuvel 16f4f75ad5SArd Biesheuvel #include "efistub.h" 17f4f75ad5SArd Biesheuvel 18980771f6SArd Biesheuvel bool efi_nochunk; 19980771f6SArd Biesheuvel bool efi_nokaslr; 20980771f6SArd Biesheuvel bool efi_noinitrd; 21980771f6SArd Biesheuvel bool efi_quiet; 22980771f6SArd Biesheuvel bool efi_novamap; 23980771f6SArd Biesheuvel 2454439370SArvind Sankar static bool efi_nosoftreserve; 2554439370SArvind Sankar static bool efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA); 2660f38de7SArd Biesheuvel 27b617c526SDan Williams bool __pure __efi_soft_reserve_enabled(void) 28b617c526SDan Williams { 29b617c526SDan Williams return !efi_nosoftreserve; 30b617c526SDan Williams } 3160f38de7SArd Biesheuvel 32cb8c90a0SArvind Sankar void efi_char16_puts(efi_char16_t *str) 33cb8c90a0SArvind Sankar { 34cb8c90a0SArvind Sankar efi_call_proto(efi_table_attr(efi_system_table, con_out), 35cb8c90a0SArvind Sankar output_string, str); 36cb8c90a0SArvind Sankar } 37cb8c90a0SArvind Sankar 38cb8c90a0SArvind Sankar void efi_puts(const char *str) 39f4f75ad5SArd Biesheuvel { 40fd0528a2SArvind Sankar efi_char16_t buf[128]; 41fd0528a2SArvind Sankar size_t pos = 0, lim = ARRAY_SIZE(buf); 42f4f75ad5SArd Biesheuvel 43fd0528a2SArvind Sankar while (*str) { 44fd0528a2SArvind Sankar if (*str == '\n') 45fd0528a2SArvind Sankar buf[pos++] = L'\r'; 46fd0528a2SArvind Sankar /* Cast to unsigned char to avoid sign-extension */ 47fd0528a2SArvind Sankar buf[pos++] = (unsigned char)(*str++); 48fd0528a2SArvind Sankar if (*str == '\0' || pos >= lim - 2) { 49fd0528a2SArvind Sankar buf[pos] = L'\0'; 50fd0528a2SArvind Sankar efi_char16_puts(buf); 51fd0528a2SArvind Sankar pos = 0; 52fd0528a2SArvind Sankar } 53f4f75ad5SArd Biesheuvel } 54f4f75ad5SArd Biesheuvel } 55f4f75ad5SArd Biesheuvel 562c7d1e30SArvind Sankar int efi_printk(const char *fmt, ...) 572c7d1e30SArvind Sankar { 582c7d1e30SArvind Sankar char printf_buf[256]; 592c7d1e30SArvind Sankar va_list args; 602c7d1e30SArvind Sankar int printed; 612c7d1e30SArvind Sankar 622c7d1e30SArvind Sankar va_start(args, fmt); 638fb331e1SArvind Sankar printed = vsnprintf(printf_buf, sizeof(printf_buf), fmt, args); 642c7d1e30SArvind Sankar va_end(args); 652c7d1e30SArvind Sankar 662c7d1e30SArvind Sankar efi_puts(printf_buf); 678fb331e1SArvind Sankar if (printed >= sizeof(printf_buf)) { 688fb331e1SArvind Sankar efi_puts("[Message truncated]\n"); 698fb331e1SArvind Sankar return -1; 708fb331e1SArvind Sankar } 712c7d1e30SArvind Sankar 722c7d1e30SArvind Sankar return printed; 732c7d1e30SArvind Sankar } 742c7d1e30SArvind Sankar 755a17dae4SMatt Fleming /* 765a17dae4SMatt Fleming * Parse the ASCII string 'cmdline' for EFI options, denoted by the efi= 775a17dae4SMatt Fleming * option, e.g. efi=nochunk. 785a17dae4SMatt Fleming * 795a17dae4SMatt Fleming * It should be noted that efi= is parsed in two very different 805a17dae4SMatt Fleming * environments, first in the early boot environment of the EFI boot 815a17dae4SMatt Fleming * stub, and subsequently during the kernel boot. 825a17dae4SMatt Fleming */ 8360f38de7SArd Biesheuvel efi_status_t efi_parse_options(char const *cmdline) 845a17dae4SMatt Fleming { 8591d150c0SArd Biesheuvel size_t len = strlen(cmdline) + 1; 8691d150c0SArd Biesheuvel efi_status_t status; 8791d150c0SArd Biesheuvel char *str, *buf; 885a17dae4SMatt Fleming 8991d150c0SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf); 9091d150c0SArd Biesheuvel if (status != EFI_SUCCESS) 9191d150c0SArd Biesheuvel return status; 9291d150c0SArd Biesheuvel 9391d150c0SArd Biesheuvel str = skip_spaces(memcpy(buf, cmdline, len)); 9491d150c0SArd Biesheuvel 9591d150c0SArd Biesheuvel while (*str) { 9691d150c0SArd Biesheuvel char *param, *val; 9791d150c0SArd Biesheuvel 9891d150c0SArd Biesheuvel str = next_arg(str, ¶m, &val); 9991d150c0SArd Biesheuvel 10091d150c0SArd Biesheuvel if (!strcmp(param, "nokaslr")) { 1017d4e323dSArd Biesheuvel efi_nokaslr = true; 10291d150c0SArd Biesheuvel } else if (!strcmp(param, "quiet")) { 1037d4e323dSArd Biesheuvel efi_quiet = true; 10479d3219dSArd Biesheuvel } else if (!strcmp(param, "noinitrd")) { 10579d3219dSArd Biesheuvel efi_noinitrd = true; 10691d150c0SArd Biesheuvel } else if (!strcmp(param, "efi") && val) { 10791d150c0SArd Biesheuvel efi_nochunk = parse_option_str(val, "nochunk"); 10891d150c0SArd Biesheuvel efi_novamap = parse_option_str(val, "novamap"); 109eeff7d63SArd Biesheuvel 11091d150c0SArd Biesheuvel efi_nosoftreserve = IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) && 11191d150c0SArd Biesheuvel parse_option_str(val, "nosoftreserve"); 1125a17dae4SMatt Fleming 11391d150c0SArd Biesheuvel if (parse_option_str(val, "disable_early_pci_dma")) 1144444f854SMatthew Garrett efi_disable_pci_dma = true; 11591d150c0SArd Biesheuvel if (parse_option_str(val, "no_disable_early_pci_dma")) 1164444f854SMatthew Garrett efi_disable_pci_dma = false; 117fffb6804SArvind Sankar } else if (!strcmp(param, "video") && 118fffb6804SArvind Sankar val && strstarts(val, "efifb:")) { 119fffb6804SArvind Sankar efi_parse_option_graphics(val + strlen("efifb:")); 1204444f854SMatthew Garrett } 1215a17dae4SMatt Fleming } 12291d150c0SArd Biesheuvel efi_bs_call(free_pool, buf); 1235a17dae4SMatt Fleming return EFI_SUCCESS; 1245a17dae4SMatt Fleming } 125f4f75ad5SArd Biesheuvel 126f4f75ad5SArd Biesheuvel /* 127f4f75ad5SArd Biesheuvel * Get the number of UTF-8 bytes corresponding to an UTF-16 character. 128f4f75ad5SArd Biesheuvel * This overestimates for surrogates, but that is okay. 129f4f75ad5SArd Biesheuvel */ 130f4f75ad5SArd Biesheuvel static int efi_utf8_bytes(u16 c) 131f4f75ad5SArd Biesheuvel { 132f4f75ad5SArd Biesheuvel return 1 + (c >= 0x80) + (c >= 0x800); 133f4f75ad5SArd Biesheuvel } 134f4f75ad5SArd Biesheuvel 135f4f75ad5SArd Biesheuvel /* 136f4f75ad5SArd Biesheuvel * Convert an UTF-16 string, not necessarily null terminated, to UTF-8. 137f4f75ad5SArd Biesheuvel */ 138f4f75ad5SArd Biesheuvel static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n) 139f4f75ad5SArd Biesheuvel { 140f4f75ad5SArd Biesheuvel unsigned int c; 141f4f75ad5SArd Biesheuvel 142f4f75ad5SArd Biesheuvel while (n--) { 143f4f75ad5SArd Biesheuvel c = *src++; 144f4f75ad5SArd Biesheuvel if (n && c >= 0xd800 && c <= 0xdbff && 145f4f75ad5SArd Biesheuvel *src >= 0xdc00 && *src <= 0xdfff) { 146f4f75ad5SArd Biesheuvel c = 0x10000 + ((c & 0x3ff) << 10) + (*src & 0x3ff); 147f4f75ad5SArd Biesheuvel src++; 148f4f75ad5SArd Biesheuvel n--; 149f4f75ad5SArd Biesheuvel } 150f4f75ad5SArd Biesheuvel if (c >= 0xd800 && c <= 0xdfff) 151f4f75ad5SArd Biesheuvel c = 0xfffd; /* Unmatched surrogate */ 152f4f75ad5SArd Biesheuvel if (c < 0x80) { 153f4f75ad5SArd Biesheuvel *dst++ = c; 154f4f75ad5SArd Biesheuvel continue; 155f4f75ad5SArd Biesheuvel } 156f4f75ad5SArd Biesheuvel if (c < 0x800) { 157f4f75ad5SArd Biesheuvel *dst++ = 0xc0 + (c >> 6); 158f4f75ad5SArd Biesheuvel goto t1; 159f4f75ad5SArd Biesheuvel } 160f4f75ad5SArd Biesheuvel if (c < 0x10000) { 161f4f75ad5SArd Biesheuvel *dst++ = 0xe0 + (c >> 12); 162f4f75ad5SArd Biesheuvel goto t2; 163f4f75ad5SArd Biesheuvel } 164f4f75ad5SArd Biesheuvel *dst++ = 0xf0 + (c >> 18); 165f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 12) & 0x3f); 166f4f75ad5SArd Biesheuvel t2: 167f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 6) & 0x3f); 168f4f75ad5SArd Biesheuvel t1: 169f4f75ad5SArd Biesheuvel *dst++ = 0x80 + (c & 0x3f); 170f4f75ad5SArd Biesheuvel } 171f4f75ad5SArd Biesheuvel 172f4f75ad5SArd Biesheuvel return dst; 173f4f75ad5SArd Biesheuvel } 174f4f75ad5SArd Biesheuvel 175f4f75ad5SArd Biesheuvel /* 176f4f75ad5SArd Biesheuvel * Convert the unicode UEFI command line to ASCII to pass to kernel. 177f4f75ad5SArd Biesheuvel * Size of memory allocated return in *cmd_line_len. 178f4f75ad5SArd Biesheuvel * Returns NULL on error. 179f4f75ad5SArd Biesheuvel */ 180cd33a5c1SArd Biesheuvel char *efi_convert_cmdline(efi_loaded_image_t *image, 1811e45bf73SArd Biesheuvel int *cmd_line_len, unsigned long max_addr) 182f4f75ad5SArd Biesheuvel { 183f4f75ad5SArd Biesheuvel const u16 *s2; 184f4f75ad5SArd Biesheuvel u8 *s1 = NULL; 185f4f75ad5SArd Biesheuvel unsigned long cmdline_addr = 0; 186f7b85b33SArd Biesheuvel int load_options_chars = efi_table_attr(image, load_options_size) / 2; 187f7b85b33SArd Biesheuvel const u16 *options = efi_table_attr(image, load_options); 188f4f75ad5SArd Biesheuvel int options_bytes = 0; /* UTF-8 bytes */ 189f4f75ad5SArd Biesheuvel int options_chars = 0; /* UTF-16 chars */ 190f4f75ad5SArd Biesheuvel efi_status_t status; 191f4f75ad5SArd Biesheuvel u16 zero = 0; 192f4f75ad5SArd Biesheuvel 193f4f75ad5SArd Biesheuvel if (options) { 194f4f75ad5SArd Biesheuvel s2 = options; 195f4f75ad5SArd Biesheuvel while (*s2 && *s2 != '\n' 196f4f75ad5SArd Biesheuvel && options_chars < load_options_chars) { 197f4f75ad5SArd Biesheuvel options_bytes += efi_utf8_bytes(*s2++); 198f4f75ad5SArd Biesheuvel options_chars++; 199f4f75ad5SArd Biesheuvel } 200f4f75ad5SArd Biesheuvel } 201f4f75ad5SArd Biesheuvel 202f4f75ad5SArd Biesheuvel if (!options_chars) { 203f4f75ad5SArd Biesheuvel /* No command line options, so return empty string*/ 204f4f75ad5SArd Biesheuvel options = &zero; 205f4f75ad5SArd Biesheuvel } 206f4f75ad5SArd Biesheuvel 207f4f75ad5SArd Biesheuvel options_bytes++; /* NUL termination */ 208f4f75ad5SArd Biesheuvel 2091e45bf73SArd Biesheuvel status = efi_allocate_pages(options_bytes, &cmdline_addr, max_addr); 210f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 211f4f75ad5SArd Biesheuvel return NULL; 212f4f75ad5SArd Biesheuvel 213f4f75ad5SArd Biesheuvel s1 = (u8 *)cmdline_addr; 214f4f75ad5SArd Biesheuvel s2 = (const u16 *)options; 215f4f75ad5SArd Biesheuvel 216f4f75ad5SArd Biesheuvel s1 = efi_utf16_to_utf8(s1, s2, options_chars); 217f4f75ad5SArd Biesheuvel *s1 = '\0'; 218f4f75ad5SArd Biesheuvel 219f4f75ad5SArd Biesheuvel *cmd_line_len = options_bytes; 220f4f75ad5SArd Biesheuvel return (char *)cmdline_addr; 221f4f75ad5SArd Biesheuvel } 222fc07716bSJeffrey Hugo 223fc07716bSJeffrey Hugo /* 224fc07716bSJeffrey Hugo * Handle calling ExitBootServices according to the requirements set out by the 225fc07716bSJeffrey Hugo * spec. Obtains the current memory map, and returns that info after calling 226fc07716bSJeffrey Hugo * ExitBootServices. The client must specify a function to perform any 227fc07716bSJeffrey Hugo * processing of the memory map data prior to ExitBootServices. A client 228fc07716bSJeffrey Hugo * specific structure may be passed to the function via priv. The client 229fc07716bSJeffrey Hugo * function may be called multiple times. 230fc07716bSJeffrey Hugo */ 231cd33a5c1SArd Biesheuvel efi_status_t efi_exit_boot_services(void *handle, 232fc07716bSJeffrey Hugo struct efi_boot_memmap *map, 233fc07716bSJeffrey Hugo void *priv, 234fc07716bSJeffrey Hugo efi_exit_boot_map_processing priv_func) 235fc07716bSJeffrey Hugo { 236fc07716bSJeffrey Hugo efi_status_t status; 237fc07716bSJeffrey Hugo 238cd33a5c1SArd Biesheuvel status = efi_get_memory_map(map); 239fc07716bSJeffrey Hugo 240fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 241fc07716bSJeffrey Hugo goto fail; 242fc07716bSJeffrey Hugo 243cd33a5c1SArd Biesheuvel status = priv_func(map, priv); 244fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 245fc07716bSJeffrey Hugo goto free_map; 246fc07716bSJeffrey Hugo 2474444f854SMatthew Garrett if (efi_disable_pci_dma) 2484444f854SMatthew Garrett efi_pci_disable_bridge_busmaster(); 2494444f854SMatthew Garrett 250966291f6SArd Biesheuvel status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); 251fc07716bSJeffrey Hugo 252fc07716bSJeffrey Hugo if (status == EFI_INVALID_PARAMETER) { 253fc07716bSJeffrey Hugo /* 254fc07716bSJeffrey Hugo * The memory map changed between efi_get_memory_map() and 255fc07716bSJeffrey Hugo * exit_boot_services(). Per the UEFI Spec v2.6, Section 6.4: 256fc07716bSJeffrey Hugo * EFI_BOOT_SERVICES.ExitBootServices we need to get the 257fc07716bSJeffrey Hugo * updated map, and try again. The spec implies one retry 258fc07716bSJeffrey Hugo * should be sufficent, which is confirmed against the EDK2 259fc07716bSJeffrey Hugo * implementation. Per the spec, we can only invoke 260fc07716bSJeffrey Hugo * get_memory_map() and exit_boot_services() - we cannot alloc 261fc07716bSJeffrey Hugo * so efi_get_memory_map() cannot be used, and we must reuse 262fc07716bSJeffrey Hugo * the buffer. For all practical purposes, the headroom in the 263fc07716bSJeffrey Hugo * buffer should account for any changes in the map so the call 264fc07716bSJeffrey Hugo * to get_memory_map() is expected to succeed here. 265fc07716bSJeffrey Hugo */ 266fc07716bSJeffrey Hugo *map->map_size = *map->buff_size; 267966291f6SArd Biesheuvel status = efi_bs_call(get_memory_map, 268fc07716bSJeffrey Hugo map->map_size, 269fc07716bSJeffrey Hugo *map->map, 270fc07716bSJeffrey Hugo map->key_ptr, 271fc07716bSJeffrey Hugo map->desc_size, 272fc07716bSJeffrey Hugo map->desc_ver); 273fc07716bSJeffrey Hugo 274fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 275fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 276fc07716bSJeffrey Hugo goto fail; 277fc07716bSJeffrey Hugo 278cd33a5c1SArd Biesheuvel status = priv_func(map, priv); 279fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 280fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 281fc07716bSJeffrey Hugo goto fail; 282fc07716bSJeffrey Hugo 283966291f6SArd Biesheuvel status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); 284fc07716bSJeffrey Hugo } 285fc07716bSJeffrey Hugo 286fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 287fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 288fc07716bSJeffrey Hugo goto fail; 289fc07716bSJeffrey Hugo 290fc07716bSJeffrey Hugo return EFI_SUCCESS; 291fc07716bSJeffrey Hugo 292fc07716bSJeffrey Hugo free_map: 293966291f6SArd Biesheuvel efi_bs_call(free_pool, *map->map); 294fc07716bSJeffrey Hugo fail: 295fc07716bSJeffrey Hugo return status; 296fc07716bSJeffrey Hugo } 29782d736acSMatthew Garrett 298cd33a5c1SArd Biesheuvel void *get_efi_config_table(efi_guid_t guid) 29982d736acSMatthew Garrett { 300ccc27ae7SArd Biesheuvel unsigned long tables = efi_table_attr(efi_system_table, tables); 301ccc27ae7SArd Biesheuvel int nr_tables = efi_table_attr(efi_system_table, nr_tables); 302f958efe9SArd Biesheuvel int i; 303f958efe9SArd Biesheuvel 304f958efe9SArd Biesheuvel for (i = 0; i < nr_tables; i++) { 305f958efe9SArd Biesheuvel efi_config_table_t *t = (void *)tables; 306f958efe9SArd Biesheuvel 307f958efe9SArd Biesheuvel if (efi_guidcmp(t->guid, guid) == 0) 30899ea8b1dSArd Biesheuvel return efi_table_attr(t, table); 309f958efe9SArd Biesheuvel 310f958efe9SArd Biesheuvel tables += efi_is_native() ? sizeof(efi_config_table_t) 311f958efe9SArd Biesheuvel : sizeof(efi_config_table_32_t); 312f958efe9SArd Biesheuvel } 313f958efe9SArd Biesheuvel return NULL; 31482d736acSMatthew Garrett } 315dc29da14SArd Biesheuvel 316ec93fc37SArd Biesheuvel /* 317ec93fc37SArd Biesheuvel * The LINUX_EFI_INITRD_MEDIA_GUID vendor media device path below provides a way 318ec93fc37SArd Biesheuvel * for the firmware or bootloader to expose the initrd data directly to the stub 319ec93fc37SArd Biesheuvel * via the trivial LoadFile2 protocol, which is defined in the UEFI spec, and is 320ec93fc37SArd Biesheuvel * very easy to implement. It is a simple Linux initrd specific conduit between 321ec93fc37SArd Biesheuvel * kernel and firmware, allowing us to put the EFI stub (being part of the 322ec93fc37SArd Biesheuvel * kernel) in charge of where and when to load the initrd, while leaving it up 323ec93fc37SArd Biesheuvel * to the firmware to decide whether it needs to expose its filesystem hierarchy 324ec93fc37SArd Biesheuvel * via EFI protocols. 325ec93fc37SArd Biesheuvel */ 326ec93fc37SArd Biesheuvel static const struct { 327ec93fc37SArd Biesheuvel struct efi_vendor_dev_path vendor; 328ec93fc37SArd Biesheuvel struct efi_generic_dev_path end; 329ec93fc37SArd Biesheuvel } __packed initrd_dev_path = { 330ec93fc37SArd Biesheuvel { 331ec93fc37SArd Biesheuvel { 332ec93fc37SArd Biesheuvel EFI_DEV_MEDIA, 333ec93fc37SArd Biesheuvel EFI_DEV_MEDIA_VENDOR, 334ec93fc37SArd Biesheuvel sizeof(struct efi_vendor_dev_path), 335ec93fc37SArd Biesheuvel }, 336ec93fc37SArd Biesheuvel LINUX_EFI_INITRD_MEDIA_GUID 337ec93fc37SArd Biesheuvel }, { 338ec93fc37SArd Biesheuvel EFI_DEV_END_PATH, 339ec93fc37SArd Biesheuvel EFI_DEV_END_ENTIRE, 340ec93fc37SArd Biesheuvel sizeof(struct efi_generic_dev_path) 341ec93fc37SArd Biesheuvel } 342ec93fc37SArd Biesheuvel }; 343ec93fc37SArd Biesheuvel 344ec93fc37SArd Biesheuvel /** 345ec93fc37SArd Biesheuvel * efi_load_initrd_dev_path - load the initrd from the Linux initrd device path 346ec93fc37SArd Biesheuvel * @load_addr: pointer to store the address where the initrd was loaded 347ec93fc37SArd Biesheuvel * @load_size: pointer to store the size of the loaded initrd 348ec93fc37SArd Biesheuvel * @max: upper limit for the initrd memory allocation 349ec93fc37SArd Biesheuvel * @return: %EFI_SUCCESS if the initrd was loaded successfully, in which 350ec93fc37SArd Biesheuvel * case @load_addr and @load_size are assigned accordingly 351ec93fc37SArd Biesheuvel * %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd 352ec93fc37SArd Biesheuvel * device path 353ec93fc37SArd Biesheuvel * %EFI_INVALID_PARAMETER if load_addr == NULL or load_size == NULL 354ec93fc37SArd Biesheuvel * %EFI_OUT_OF_RESOURCES if memory allocation failed 355ec93fc37SArd Biesheuvel * %EFI_LOAD_ERROR in all other cases 356ec93fc37SArd Biesheuvel */ 357f61900fdSArvind Sankar static 358ec93fc37SArd Biesheuvel efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr, 359ec93fc37SArd Biesheuvel unsigned long *load_size, 360ec93fc37SArd Biesheuvel unsigned long max) 361ec93fc37SArd Biesheuvel { 362ec93fc37SArd Biesheuvel efi_guid_t lf2_proto_guid = EFI_LOAD_FILE2_PROTOCOL_GUID; 363ec93fc37SArd Biesheuvel efi_device_path_protocol_t *dp; 364ec93fc37SArd Biesheuvel efi_load_file2_protocol_t *lf2; 365ec93fc37SArd Biesheuvel unsigned long initrd_addr; 366ec93fc37SArd Biesheuvel unsigned long initrd_size; 367ec93fc37SArd Biesheuvel efi_handle_t handle; 368ec93fc37SArd Biesheuvel efi_status_t status; 369ec93fc37SArd Biesheuvel 370ec93fc37SArd Biesheuvel dp = (efi_device_path_protocol_t *)&initrd_dev_path; 371ec93fc37SArd Biesheuvel status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle); 372ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 373ec93fc37SArd Biesheuvel return status; 374ec93fc37SArd Biesheuvel 375ec93fc37SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, &lf2_proto_guid, 376ec93fc37SArd Biesheuvel (void **)&lf2); 377ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 378ec93fc37SArd Biesheuvel return status; 379ec93fc37SArd Biesheuvel 380ec93fc37SArd Biesheuvel status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, NULL); 381ec93fc37SArd Biesheuvel if (status != EFI_BUFFER_TOO_SMALL) 382ec93fc37SArd Biesheuvel return EFI_LOAD_ERROR; 383ec93fc37SArd Biesheuvel 384ec93fc37SArd Biesheuvel status = efi_allocate_pages(initrd_size, &initrd_addr, max); 385ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 386ec93fc37SArd Biesheuvel return status; 387ec93fc37SArd Biesheuvel 388ec93fc37SArd Biesheuvel status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, 389ec93fc37SArd Biesheuvel (void *)initrd_addr); 390ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) { 391ec93fc37SArd Biesheuvel efi_free(initrd_size, initrd_addr); 392ec93fc37SArd Biesheuvel return EFI_LOAD_ERROR; 393ec93fc37SArd Biesheuvel } 394ec93fc37SArd Biesheuvel 395ec93fc37SArd Biesheuvel *load_addr = initrd_addr; 396ec93fc37SArd Biesheuvel *load_size = initrd_size; 397ec93fc37SArd Biesheuvel return EFI_SUCCESS; 398ec93fc37SArd Biesheuvel } 399f61900fdSArvind Sankar 400f61900fdSArvind Sankar static 401f61900fdSArvind Sankar efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image, 402f61900fdSArvind Sankar unsigned long *load_addr, 403f61900fdSArvind Sankar unsigned long *load_size, 404f61900fdSArvind Sankar unsigned long soft_limit, 405f61900fdSArvind Sankar unsigned long hard_limit) 406f61900fdSArvind Sankar { 407f61900fdSArvind Sankar if (!IS_ENABLED(CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER) || 408f61900fdSArvind Sankar (IS_ENABLED(CONFIG_X86) && (!efi_is_native() || image == NULL))) { 409f61900fdSArvind Sankar *load_addr = *load_size = 0; 410f61900fdSArvind Sankar return EFI_SUCCESS; 411f61900fdSArvind Sankar } 412f61900fdSArvind Sankar 413f61900fdSArvind Sankar return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2, 414f61900fdSArvind Sankar soft_limit, hard_limit, 415f61900fdSArvind Sankar load_addr, load_size); 416f61900fdSArvind Sankar } 417f61900fdSArvind Sankar 418f61900fdSArvind Sankar efi_status_t efi_load_initrd(efi_loaded_image_t *image, 419f61900fdSArvind Sankar unsigned long *load_addr, 420f61900fdSArvind Sankar unsigned long *load_size, 421f61900fdSArvind Sankar unsigned long soft_limit, 422f61900fdSArvind Sankar unsigned long hard_limit) 423f61900fdSArvind Sankar { 424f61900fdSArvind Sankar efi_status_t status; 425f61900fdSArvind Sankar 426f61900fdSArvind Sankar if (!load_addr || !load_size) 427f61900fdSArvind Sankar return EFI_INVALID_PARAMETER; 428f61900fdSArvind Sankar 429f61900fdSArvind Sankar status = efi_load_initrd_dev_path(load_addr, load_size, hard_limit); 430f61900fdSArvind Sankar if (status == EFI_SUCCESS) { 431f61900fdSArvind Sankar efi_info("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n"); 432f61900fdSArvind Sankar } else if (status == EFI_NOT_FOUND) { 433f61900fdSArvind Sankar status = efi_load_initrd_cmdline(image, load_addr, load_size, 434f61900fdSArvind Sankar soft_limit, hard_limit); 435f61900fdSArvind Sankar if (status == EFI_SUCCESS && *load_size > 0) 436f61900fdSArvind Sankar efi_info("Loaded initrd from command line option\n"); 437f61900fdSArvind Sankar } 438f61900fdSArvind Sankar 439f61900fdSArvind Sankar return status; 440f61900fdSArvind Sankar } 441