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 15980771f6SArd Biesheuvel bool efi_nochunk; 16980771f6SArd Biesheuvel bool efi_nokaslr; 17980771f6SArd Biesheuvel bool efi_noinitrd; 18980771f6SArd Biesheuvel bool efi_quiet; 19980771f6SArd Biesheuvel bool efi_novamap; 20980771f6SArd Biesheuvel 2154439370SArvind Sankar static bool efi_nosoftreserve; 2254439370SArvind Sankar static bool efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA); 2360f38de7SArd Biesheuvel 24b617c526SDan Williams bool __pure __efi_soft_reserve_enabled(void) 25b617c526SDan Williams { 26b617c526SDan Williams return !efi_nosoftreserve; 27b617c526SDan Williams } 2860f38de7SArd Biesheuvel 298173ec79SArd Biesheuvel void efi_printk(char *str) 30f4f75ad5SArd Biesheuvel { 31f4f75ad5SArd Biesheuvel char *s8; 32f4f75ad5SArd Biesheuvel 33f4f75ad5SArd Biesheuvel for (s8 = str; *s8; s8++) { 34f4f75ad5SArd Biesheuvel efi_char16_t ch[2] = { 0 }; 35f4f75ad5SArd Biesheuvel 36f4f75ad5SArd Biesheuvel ch[0] = *s8; 37f4f75ad5SArd Biesheuvel if (*s8 == '\n') { 38f4f75ad5SArd Biesheuvel efi_char16_t nl[2] = { '\r', 0 }; 398173ec79SArd Biesheuvel efi_char16_printk(nl); 40f4f75ad5SArd Biesheuvel } 41f4f75ad5SArd Biesheuvel 428173ec79SArd Biesheuvel efi_char16_printk(ch); 43f4f75ad5SArd Biesheuvel } 44f4f75ad5SArd Biesheuvel } 45f4f75ad5SArd Biesheuvel 465a17dae4SMatt Fleming /* 475a17dae4SMatt Fleming * Parse the ASCII string 'cmdline' for EFI options, denoted by the efi= 485a17dae4SMatt Fleming * option, e.g. efi=nochunk. 495a17dae4SMatt Fleming * 505a17dae4SMatt Fleming * It should be noted that efi= is parsed in two very different 515a17dae4SMatt Fleming * environments, first in the early boot environment of the EFI boot 525a17dae4SMatt Fleming * stub, and subsequently during the kernel boot. 535a17dae4SMatt Fleming */ 5460f38de7SArd Biesheuvel efi_status_t efi_parse_options(char const *cmdline) 555a17dae4SMatt Fleming { 5691d150c0SArd Biesheuvel size_t len = strlen(cmdline) + 1; 5791d150c0SArd Biesheuvel efi_status_t status; 5891d150c0SArd Biesheuvel char *str, *buf; 595a17dae4SMatt Fleming 6091d150c0SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf); 6191d150c0SArd Biesheuvel if (status != EFI_SUCCESS) 6291d150c0SArd Biesheuvel return status; 6391d150c0SArd Biesheuvel 6491d150c0SArd Biesheuvel str = skip_spaces(memcpy(buf, cmdline, len)); 6591d150c0SArd Biesheuvel 6691d150c0SArd Biesheuvel while (*str) { 6791d150c0SArd Biesheuvel char *param, *val; 6891d150c0SArd Biesheuvel 6991d150c0SArd Biesheuvel str = next_arg(str, ¶m, &val); 7091d150c0SArd Biesheuvel 7191d150c0SArd Biesheuvel if (!strcmp(param, "nokaslr")) { 727d4e323dSArd Biesheuvel efi_nokaslr = true; 7391d150c0SArd Biesheuvel } else if (!strcmp(param, "quiet")) { 747d4e323dSArd Biesheuvel efi_quiet = true; 7579d3219dSArd Biesheuvel } else if (!strcmp(param, "noinitrd")) { 7679d3219dSArd Biesheuvel efi_noinitrd = true; 7791d150c0SArd Biesheuvel } else if (!strcmp(param, "efi") && val) { 7891d150c0SArd Biesheuvel efi_nochunk = parse_option_str(val, "nochunk"); 7991d150c0SArd Biesheuvel efi_novamap = parse_option_str(val, "novamap"); 80eeff7d63SArd Biesheuvel 8191d150c0SArd Biesheuvel efi_nosoftreserve = IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) && 8291d150c0SArd Biesheuvel parse_option_str(val, "nosoftreserve"); 835a17dae4SMatt Fleming 8491d150c0SArd Biesheuvel if (parse_option_str(val, "disable_early_pci_dma")) 854444f854SMatthew Garrett efi_disable_pci_dma = true; 8691d150c0SArd Biesheuvel if (parse_option_str(val, "no_disable_early_pci_dma")) 874444f854SMatthew Garrett efi_disable_pci_dma = false; 88fffb6804SArvind Sankar } else if (!strcmp(param, "video") && 89fffb6804SArvind Sankar val && strstarts(val, "efifb:")) { 90fffb6804SArvind Sankar efi_parse_option_graphics(val + strlen("efifb:")); 914444f854SMatthew Garrett } 925a17dae4SMatt Fleming } 9391d150c0SArd Biesheuvel efi_bs_call(free_pool, buf); 945a17dae4SMatt Fleming return EFI_SUCCESS; 955a17dae4SMatt Fleming } 96f4f75ad5SArd Biesheuvel 97f4f75ad5SArd Biesheuvel /* 98f4f75ad5SArd Biesheuvel * Get the number of UTF-8 bytes corresponding to an UTF-16 character. 99f4f75ad5SArd Biesheuvel * This overestimates for surrogates, but that is okay. 100f4f75ad5SArd Biesheuvel */ 101f4f75ad5SArd Biesheuvel static int efi_utf8_bytes(u16 c) 102f4f75ad5SArd Biesheuvel { 103f4f75ad5SArd Biesheuvel return 1 + (c >= 0x80) + (c >= 0x800); 104f4f75ad5SArd Biesheuvel } 105f4f75ad5SArd Biesheuvel 106f4f75ad5SArd Biesheuvel /* 107f4f75ad5SArd Biesheuvel * Convert an UTF-16 string, not necessarily null terminated, to UTF-8. 108f4f75ad5SArd Biesheuvel */ 109f4f75ad5SArd Biesheuvel static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n) 110f4f75ad5SArd Biesheuvel { 111f4f75ad5SArd Biesheuvel unsigned int c; 112f4f75ad5SArd Biesheuvel 113f4f75ad5SArd Biesheuvel while (n--) { 114f4f75ad5SArd Biesheuvel c = *src++; 115f4f75ad5SArd Biesheuvel if (n && c >= 0xd800 && c <= 0xdbff && 116f4f75ad5SArd Biesheuvel *src >= 0xdc00 && *src <= 0xdfff) { 117f4f75ad5SArd Biesheuvel c = 0x10000 + ((c & 0x3ff) << 10) + (*src & 0x3ff); 118f4f75ad5SArd Biesheuvel src++; 119f4f75ad5SArd Biesheuvel n--; 120f4f75ad5SArd Biesheuvel } 121f4f75ad5SArd Biesheuvel if (c >= 0xd800 && c <= 0xdfff) 122f4f75ad5SArd Biesheuvel c = 0xfffd; /* Unmatched surrogate */ 123f4f75ad5SArd Biesheuvel if (c < 0x80) { 124f4f75ad5SArd Biesheuvel *dst++ = c; 125f4f75ad5SArd Biesheuvel continue; 126f4f75ad5SArd Biesheuvel } 127f4f75ad5SArd Biesheuvel if (c < 0x800) { 128f4f75ad5SArd Biesheuvel *dst++ = 0xc0 + (c >> 6); 129f4f75ad5SArd Biesheuvel goto t1; 130f4f75ad5SArd Biesheuvel } 131f4f75ad5SArd Biesheuvel if (c < 0x10000) { 132f4f75ad5SArd Biesheuvel *dst++ = 0xe0 + (c >> 12); 133f4f75ad5SArd Biesheuvel goto t2; 134f4f75ad5SArd Biesheuvel } 135f4f75ad5SArd Biesheuvel *dst++ = 0xf0 + (c >> 18); 136f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 12) & 0x3f); 137f4f75ad5SArd Biesheuvel t2: 138f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 6) & 0x3f); 139f4f75ad5SArd Biesheuvel t1: 140f4f75ad5SArd Biesheuvel *dst++ = 0x80 + (c & 0x3f); 141f4f75ad5SArd Biesheuvel } 142f4f75ad5SArd Biesheuvel 143f4f75ad5SArd Biesheuvel return dst; 144f4f75ad5SArd Biesheuvel } 145f4f75ad5SArd Biesheuvel 146f4f75ad5SArd Biesheuvel /* 147f4f75ad5SArd Biesheuvel * Convert the unicode UEFI command line to ASCII to pass to kernel. 148f4f75ad5SArd Biesheuvel * Size of memory allocated return in *cmd_line_len. 149f4f75ad5SArd Biesheuvel * Returns NULL on error. 150f4f75ad5SArd Biesheuvel */ 151cd33a5c1SArd Biesheuvel char *efi_convert_cmdline(efi_loaded_image_t *image, 1521e45bf73SArd Biesheuvel int *cmd_line_len, unsigned long max_addr) 153f4f75ad5SArd Biesheuvel { 154f4f75ad5SArd Biesheuvel const u16 *s2; 155f4f75ad5SArd Biesheuvel u8 *s1 = NULL; 156f4f75ad5SArd Biesheuvel unsigned long cmdline_addr = 0; 157f7b85b33SArd Biesheuvel int load_options_chars = efi_table_attr(image, load_options_size) / 2; 158f7b85b33SArd Biesheuvel const u16 *options = efi_table_attr(image, load_options); 159f4f75ad5SArd Biesheuvel int options_bytes = 0; /* UTF-8 bytes */ 160f4f75ad5SArd Biesheuvel int options_chars = 0; /* UTF-16 chars */ 161f4f75ad5SArd Biesheuvel efi_status_t status; 162f4f75ad5SArd Biesheuvel u16 zero = 0; 163f4f75ad5SArd Biesheuvel 164f4f75ad5SArd Biesheuvel if (options) { 165f4f75ad5SArd Biesheuvel s2 = options; 166f4f75ad5SArd Biesheuvel while (*s2 && *s2 != '\n' 167f4f75ad5SArd Biesheuvel && options_chars < load_options_chars) { 168f4f75ad5SArd Biesheuvel options_bytes += efi_utf8_bytes(*s2++); 169f4f75ad5SArd Biesheuvel options_chars++; 170f4f75ad5SArd Biesheuvel } 171f4f75ad5SArd Biesheuvel } 172f4f75ad5SArd Biesheuvel 173f4f75ad5SArd Biesheuvel if (!options_chars) { 174f4f75ad5SArd Biesheuvel /* No command line options, so return empty string*/ 175f4f75ad5SArd Biesheuvel options = &zero; 176f4f75ad5SArd Biesheuvel } 177f4f75ad5SArd Biesheuvel 178f4f75ad5SArd Biesheuvel options_bytes++; /* NUL termination */ 179f4f75ad5SArd Biesheuvel 1801e45bf73SArd Biesheuvel status = efi_allocate_pages(options_bytes, &cmdline_addr, max_addr); 181f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 182f4f75ad5SArd Biesheuvel return NULL; 183f4f75ad5SArd Biesheuvel 184f4f75ad5SArd Biesheuvel s1 = (u8 *)cmdline_addr; 185f4f75ad5SArd Biesheuvel s2 = (const u16 *)options; 186f4f75ad5SArd Biesheuvel 187f4f75ad5SArd Biesheuvel s1 = efi_utf16_to_utf8(s1, s2, options_chars); 188f4f75ad5SArd Biesheuvel *s1 = '\0'; 189f4f75ad5SArd Biesheuvel 190f4f75ad5SArd Biesheuvel *cmd_line_len = options_bytes; 191f4f75ad5SArd Biesheuvel return (char *)cmdline_addr; 192f4f75ad5SArd Biesheuvel } 193fc07716bSJeffrey Hugo 194fc07716bSJeffrey Hugo /* 195fc07716bSJeffrey Hugo * Handle calling ExitBootServices according to the requirements set out by the 196fc07716bSJeffrey Hugo * spec. Obtains the current memory map, and returns that info after calling 197fc07716bSJeffrey Hugo * ExitBootServices. The client must specify a function to perform any 198fc07716bSJeffrey Hugo * processing of the memory map data prior to ExitBootServices. A client 199fc07716bSJeffrey Hugo * specific structure may be passed to the function via priv. The client 200fc07716bSJeffrey Hugo * function may be called multiple times. 201fc07716bSJeffrey Hugo */ 202cd33a5c1SArd Biesheuvel efi_status_t efi_exit_boot_services(void *handle, 203fc07716bSJeffrey Hugo struct efi_boot_memmap *map, 204fc07716bSJeffrey Hugo void *priv, 205fc07716bSJeffrey Hugo efi_exit_boot_map_processing priv_func) 206fc07716bSJeffrey Hugo { 207fc07716bSJeffrey Hugo efi_status_t status; 208fc07716bSJeffrey Hugo 209cd33a5c1SArd Biesheuvel status = efi_get_memory_map(map); 210fc07716bSJeffrey Hugo 211fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 212fc07716bSJeffrey Hugo goto fail; 213fc07716bSJeffrey Hugo 214cd33a5c1SArd Biesheuvel status = priv_func(map, priv); 215fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 216fc07716bSJeffrey Hugo goto free_map; 217fc07716bSJeffrey Hugo 2184444f854SMatthew Garrett if (efi_disable_pci_dma) 2194444f854SMatthew Garrett efi_pci_disable_bridge_busmaster(); 2204444f854SMatthew Garrett 221966291f6SArd Biesheuvel status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); 222fc07716bSJeffrey Hugo 223fc07716bSJeffrey Hugo if (status == EFI_INVALID_PARAMETER) { 224fc07716bSJeffrey Hugo /* 225fc07716bSJeffrey Hugo * The memory map changed between efi_get_memory_map() and 226fc07716bSJeffrey Hugo * exit_boot_services(). Per the UEFI Spec v2.6, Section 6.4: 227fc07716bSJeffrey Hugo * EFI_BOOT_SERVICES.ExitBootServices we need to get the 228fc07716bSJeffrey Hugo * updated map, and try again. The spec implies one retry 229fc07716bSJeffrey Hugo * should be sufficent, which is confirmed against the EDK2 230fc07716bSJeffrey Hugo * implementation. Per the spec, we can only invoke 231fc07716bSJeffrey Hugo * get_memory_map() and exit_boot_services() - we cannot alloc 232fc07716bSJeffrey Hugo * so efi_get_memory_map() cannot be used, and we must reuse 233fc07716bSJeffrey Hugo * the buffer. For all practical purposes, the headroom in the 234fc07716bSJeffrey Hugo * buffer should account for any changes in the map so the call 235fc07716bSJeffrey Hugo * to get_memory_map() is expected to succeed here. 236fc07716bSJeffrey Hugo */ 237fc07716bSJeffrey Hugo *map->map_size = *map->buff_size; 238966291f6SArd Biesheuvel status = efi_bs_call(get_memory_map, 239fc07716bSJeffrey Hugo map->map_size, 240fc07716bSJeffrey Hugo *map->map, 241fc07716bSJeffrey Hugo map->key_ptr, 242fc07716bSJeffrey Hugo map->desc_size, 243fc07716bSJeffrey Hugo map->desc_ver); 244fc07716bSJeffrey Hugo 245fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 246fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 247fc07716bSJeffrey Hugo goto fail; 248fc07716bSJeffrey Hugo 249cd33a5c1SArd Biesheuvel status = priv_func(map, priv); 250fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 251fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 252fc07716bSJeffrey Hugo goto fail; 253fc07716bSJeffrey Hugo 254966291f6SArd Biesheuvel status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); 255fc07716bSJeffrey Hugo } 256fc07716bSJeffrey Hugo 257fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 258fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 259fc07716bSJeffrey Hugo goto fail; 260fc07716bSJeffrey Hugo 261fc07716bSJeffrey Hugo return EFI_SUCCESS; 262fc07716bSJeffrey Hugo 263fc07716bSJeffrey Hugo free_map: 264966291f6SArd Biesheuvel efi_bs_call(free_pool, *map->map); 265fc07716bSJeffrey Hugo fail: 266fc07716bSJeffrey Hugo return status; 267fc07716bSJeffrey Hugo } 26882d736acSMatthew Garrett 269cd33a5c1SArd Biesheuvel void *get_efi_config_table(efi_guid_t guid) 27082d736acSMatthew Garrett { 271ccc27ae7SArd Biesheuvel unsigned long tables = efi_table_attr(efi_system_table, tables); 272ccc27ae7SArd Biesheuvel int nr_tables = efi_table_attr(efi_system_table, nr_tables); 273f958efe9SArd Biesheuvel int i; 274f958efe9SArd Biesheuvel 275f958efe9SArd Biesheuvel for (i = 0; i < nr_tables; i++) { 276f958efe9SArd Biesheuvel efi_config_table_t *t = (void *)tables; 277f958efe9SArd Biesheuvel 278f958efe9SArd Biesheuvel if (efi_guidcmp(t->guid, guid) == 0) 27999ea8b1dSArd Biesheuvel return efi_table_attr(t, table); 280f958efe9SArd Biesheuvel 281f958efe9SArd Biesheuvel tables += efi_is_native() ? sizeof(efi_config_table_t) 282f958efe9SArd Biesheuvel : sizeof(efi_config_table_32_t); 283f958efe9SArd Biesheuvel } 284f958efe9SArd Biesheuvel return NULL; 28582d736acSMatthew Garrett } 286dc29da14SArd Biesheuvel 2878173ec79SArd Biesheuvel void efi_char16_printk(efi_char16_t *str) 288dc29da14SArd Biesheuvel { 289ccc27ae7SArd Biesheuvel efi_call_proto(efi_table_attr(efi_system_table, con_out), 29047c0fd39SArd Biesheuvel output_string, str); 291dc29da14SArd Biesheuvel } 292ec93fc37SArd Biesheuvel 293ec93fc37SArd Biesheuvel /* 294ec93fc37SArd Biesheuvel * The LINUX_EFI_INITRD_MEDIA_GUID vendor media device path below provides a way 295ec93fc37SArd Biesheuvel * for the firmware or bootloader to expose the initrd data directly to the stub 296ec93fc37SArd Biesheuvel * via the trivial LoadFile2 protocol, which is defined in the UEFI spec, and is 297ec93fc37SArd Biesheuvel * very easy to implement. It is a simple Linux initrd specific conduit between 298ec93fc37SArd Biesheuvel * kernel and firmware, allowing us to put the EFI stub (being part of the 299ec93fc37SArd Biesheuvel * kernel) in charge of where and when to load the initrd, while leaving it up 300ec93fc37SArd Biesheuvel * to the firmware to decide whether it needs to expose its filesystem hierarchy 301ec93fc37SArd Biesheuvel * via EFI protocols. 302ec93fc37SArd Biesheuvel */ 303ec93fc37SArd Biesheuvel static const struct { 304ec93fc37SArd Biesheuvel struct efi_vendor_dev_path vendor; 305ec93fc37SArd Biesheuvel struct efi_generic_dev_path end; 306ec93fc37SArd Biesheuvel } __packed initrd_dev_path = { 307ec93fc37SArd Biesheuvel { 308ec93fc37SArd Biesheuvel { 309ec93fc37SArd Biesheuvel EFI_DEV_MEDIA, 310ec93fc37SArd Biesheuvel EFI_DEV_MEDIA_VENDOR, 311ec93fc37SArd Biesheuvel sizeof(struct efi_vendor_dev_path), 312ec93fc37SArd Biesheuvel }, 313ec93fc37SArd Biesheuvel LINUX_EFI_INITRD_MEDIA_GUID 314ec93fc37SArd Biesheuvel }, { 315ec93fc37SArd Biesheuvel EFI_DEV_END_PATH, 316ec93fc37SArd Biesheuvel EFI_DEV_END_ENTIRE, 317ec93fc37SArd Biesheuvel sizeof(struct efi_generic_dev_path) 318ec93fc37SArd Biesheuvel } 319ec93fc37SArd Biesheuvel }; 320ec93fc37SArd Biesheuvel 321ec93fc37SArd Biesheuvel /** 322ec93fc37SArd Biesheuvel * efi_load_initrd_dev_path - load the initrd from the Linux initrd device path 323ec93fc37SArd Biesheuvel * @load_addr: pointer to store the address where the initrd was loaded 324ec93fc37SArd Biesheuvel * @load_size: pointer to store the size of the loaded initrd 325ec93fc37SArd Biesheuvel * @max: upper limit for the initrd memory allocation 326ec93fc37SArd Biesheuvel * @return: %EFI_SUCCESS if the initrd was loaded successfully, in which 327ec93fc37SArd Biesheuvel * case @load_addr and @load_size are assigned accordingly 328ec93fc37SArd Biesheuvel * %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd 329ec93fc37SArd Biesheuvel * device path 330ec93fc37SArd Biesheuvel * %EFI_INVALID_PARAMETER if load_addr == NULL or load_size == NULL 331ec93fc37SArd Biesheuvel * %EFI_OUT_OF_RESOURCES if memory allocation failed 332ec93fc37SArd Biesheuvel * %EFI_LOAD_ERROR in all other cases 333ec93fc37SArd Biesheuvel */ 334f61900fdSArvind Sankar static 335ec93fc37SArd Biesheuvel efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr, 336ec93fc37SArd Biesheuvel unsigned long *load_size, 337ec93fc37SArd Biesheuvel unsigned long max) 338ec93fc37SArd Biesheuvel { 339ec93fc37SArd Biesheuvel efi_guid_t lf2_proto_guid = EFI_LOAD_FILE2_PROTOCOL_GUID; 340ec93fc37SArd Biesheuvel efi_device_path_protocol_t *dp; 341ec93fc37SArd Biesheuvel efi_load_file2_protocol_t *lf2; 342ec93fc37SArd Biesheuvel unsigned long initrd_addr; 343ec93fc37SArd Biesheuvel unsigned long initrd_size; 344ec93fc37SArd Biesheuvel efi_handle_t handle; 345ec93fc37SArd Biesheuvel efi_status_t status; 346ec93fc37SArd Biesheuvel 347ec93fc37SArd Biesheuvel dp = (efi_device_path_protocol_t *)&initrd_dev_path; 348ec93fc37SArd Biesheuvel status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle); 349ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 350ec93fc37SArd Biesheuvel return status; 351ec93fc37SArd Biesheuvel 352ec93fc37SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, &lf2_proto_guid, 353ec93fc37SArd Biesheuvel (void **)&lf2); 354ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 355ec93fc37SArd Biesheuvel return status; 356ec93fc37SArd Biesheuvel 357ec93fc37SArd Biesheuvel status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, NULL); 358ec93fc37SArd Biesheuvel if (status != EFI_BUFFER_TOO_SMALL) 359ec93fc37SArd Biesheuvel return EFI_LOAD_ERROR; 360ec93fc37SArd Biesheuvel 361ec93fc37SArd Biesheuvel status = efi_allocate_pages(initrd_size, &initrd_addr, max); 362ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 363ec93fc37SArd Biesheuvel return status; 364ec93fc37SArd Biesheuvel 365ec93fc37SArd Biesheuvel status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, 366ec93fc37SArd Biesheuvel (void *)initrd_addr); 367ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) { 368ec93fc37SArd Biesheuvel efi_free(initrd_size, initrd_addr); 369ec93fc37SArd Biesheuvel return EFI_LOAD_ERROR; 370ec93fc37SArd Biesheuvel } 371ec93fc37SArd Biesheuvel 372ec93fc37SArd Biesheuvel *load_addr = initrd_addr; 373ec93fc37SArd Biesheuvel *load_size = initrd_size; 374ec93fc37SArd Biesheuvel return EFI_SUCCESS; 375ec93fc37SArd Biesheuvel } 376f61900fdSArvind Sankar 377f61900fdSArvind Sankar static 378f61900fdSArvind Sankar efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image, 379f61900fdSArvind Sankar unsigned long *load_addr, 380f61900fdSArvind Sankar unsigned long *load_size, 381f61900fdSArvind Sankar unsigned long soft_limit, 382f61900fdSArvind Sankar unsigned long hard_limit) 383f61900fdSArvind Sankar { 384f61900fdSArvind Sankar if (!IS_ENABLED(CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER) || 385f61900fdSArvind Sankar (IS_ENABLED(CONFIG_X86) && (!efi_is_native() || image == NULL))) { 386f61900fdSArvind Sankar *load_addr = *load_size = 0; 387f61900fdSArvind Sankar return EFI_SUCCESS; 388f61900fdSArvind Sankar } 389f61900fdSArvind Sankar 390f61900fdSArvind Sankar return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2, 391f61900fdSArvind Sankar soft_limit, hard_limit, 392f61900fdSArvind Sankar load_addr, load_size); 393f61900fdSArvind Sankar } 394f61900fdSArvind Sankar 395f61900fdSArvind Sankar efi_status_t efi_load_initrd(efi_loaded_image_t *image, 396f61900fdSArvind Sankar unsigned long *load_addr, 397f61900fdSArvind Sankar unsigned long *load_size, 398f61900fdSArvind Sankar unsigned long soft_limit, 399f61900fdSArvind Sankar unsigned long hard_limit) 400f61900fdSArvind Sankar { 401f61900fdSArvind Sankar efi_status_t status; 402f61900fdSArvind Sankar 403f61900fdSArvind Sankar if (!load_addr || !load_size) 404f61900fdSArvind Sankar return EFI_INVALID_PARAMETER; 405f61900fdSArvind Sankar 406f61900fdSArvind Sankar status = efi_load_initrd_dev_path(load_addr, load_size, hard_limit); 407f61900fdSArvind Sankar if (status == EFI_SUCCESS) { 408f61900fdSArvind Sankar efi_info("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n"); 409f61900fdSArvind Sankar } else if (status == EFI_NOT_FOUND) { 410f61900fdSArvind Sankar status = efi_load_initrd_cmdline(image, load_addr, load_size, 411f61900fdSArvind Sankar soft_limit, hard_limit); 412f61900fdSArvind Sankar if (status == EFI_SUCCESS && *load_size > 0) 413f61900fdSArvind Sankar efi_info("Loaded initrd from command line option\n"); 414f61900fdSArvind Sankar } 415f61900fdSArvind Sankar 416f61900fdSArvind Sankar return status; 417f61900fdSArvind Sankar } 418