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> 1423d5b73fSArvind Sankar #include <linux/printk.h> /* For CONSOLE_LOGLEVEL_* */ 15f4f75ad5SArd Biesheuvel #include <asm/efi.h> 16f4f75ad5SArd Biesheuvel 17f4f75ad5SArd Biesheuvel #include "efistub.h" 18f4f75ad5SArd Biesheuvel 19980771f6SArd Biesheuvel bool efi_nochunk; 20980771f6SArd Biesheuvel bool efi_nokaslr; 21980771f6SArd Biesheuvel bool efi_noinitrd; 2223d5b73fSArvind Sankar int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT; 23980771f6SArd Biesheuvel bool efi_novamap; 24980771f6SArd Biesheuvel 2554439370SArvind Sankar static bool efi_nosoftreserve; 2654439370SArvind Sankar static bool efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA); 2760f38de7SArd Biesheuvel 28b617c526SDan Williams bool __pure __efi_soft_reserve_enabled(void) 29b617c526SDan Williams { 30b617c526SDan Williams return !efi_nosoftreserve; 31b617c526SDan Williams } 3260f38de7SArd Biesheuvel 33cb8c90a0SArvind Sankar void efi_char16_puts(efi_char16_t *str) 34cb8c90a0SArvind Sankar { 35cb8c90a0SArvind Sankar efi_call_proto(efi_table_attr(efi_system_table, con_out), 36cb8c90a0SArvind Sankar output_string, str); 37cb8c90a0SArvind Sankar } 38cb8c90a0SArvind Sankar 39cb8c90a0SArvind Sankar void efi_puts(const char *str) 40f4f75ad5SArd Biesheuvel { 41fd0528a2SArvind Sankar efi_char16_t buf[128]; 42fd0528a2SArvind Sankar size_t pos = 0, lim = ARRAY_SIZE(buf); 43f4f75ad5SArd Biesheuvel 44fd0528a2SArvind Sankar while (*str) { 45fd0528a2SArvind Sankar if (*str == '\n') 46fd0528a2SArvind Sankar buf[pos++] = L'\r'; 47fd0528a2SArvind Sankar /* Cast to unsigned char to avoid sign-extension */ 48fd0528a2SArvind Sankar buf[pos++] = (unsigned char)(*str++); 49fd0528a2SArvind Sankar if (*str == '\0' || pos >= lim - 2) { 50fd0528a2SArvind Sankar buf[pos] = L'\0'; 51fd0528a2SArvind Sankar efi_char16_puts(buf); 52fd0528a2SArvind Sankar pos = 0; 53fd0528a2SArvind Sankar } 54f4f75ad5SArd Biesheuvel } 55f4f75ad5SArd Biesheuvel } 56f4f75ad5SArd Biesheuvel 572c7d1e30SArvind Sankar int efi_printk(const char *fmt, ...) 582c7d1e30SArvind Sankar { 592c7d1e30SArvind Sankar char printf_buf[256]; 602c7d1e30SArvind Sankar va_list args; 612c7d1e30SArvind Sankar int printed; 6223d5b73fSArvind Sankar int loglevel = printk_get_level(fmt); 6323d5b73fSArvind Sankar 6423d5b73fSArvind Sankar switch (loglevel) { 6523d5b73fSArvind Sankar case '0' ... '9': 6623d5b73fSArvind Sankar loglevel -= '0'; 6723d5b73fSArvind Sankar break; 6823d5b73fSArvind Sankar default: 6923d5b73fSArvind Sankar /* 7023d5b73fSArvind Sankar * Use loglevel -1 for cases where we just want to print to 7123d5b73fSArvind Sankar * the screen. 7223d5b73fSArvind Sankar */ 7323d5b73fSArvind Sankar loglevel = -1; 7423d5b73fSArvind Sankar break; 7523d5b73fSArvind Sankar } 7623d5b73fSArvind Sankar 7723d5b73fSArvind Sankar if (loglevel >= efi_loglevel) 7823d5b73fSArvind Sankar return 0; 7923d5b73fSArvind Sankar 8023d5b73fSArvind Sankar if (loglevel >= 0) 8123d5b73fSArvind Sankar efi_puts("EFI stub: "); 8223d5b73fSArvind Sankar 8323d5b73fSArvind Sankar fmt = printk_skip_level(fmt); 842c7d1e30SArvind Sankar 852c7d1e30SArvind Sankar va_start(args, fmt); 868fb331e1SArvind Sankar printed = vsnprintf(printf_buf, sizeof(printf_buf), fmt, args); 872c7d1e30SArvind Sankar va_end(args); 882c7d1e30SArvind Sankar 892c7d1e30SArvind Sankar efi_puts(printf_buf); 908fb331e1SArvind Sankar if (printed >= sizeof(printf_buf)) { 918fb331e1SArvind Sankar efi_puts("[Message truncated]\n"); 928fb331e1SArvind Sankar return -1; 938fb331e1SArvind Sankar } 942c7d1e30SArvind Sankar 952c7d1e30SArvind Sankar return printed; 962c7d1e30SArvind Sankar } 972c7d1e30SArvind Sankar 985a17dae4SMatt Fleming /* 995a17dae4SMatt Fleming * Parse the ASCII string 'cmdline' for EFI options, denoted by the efi= 1005a17dae4SMatt Fleming * option, e.g. efi=nochunk. 1015a17dae4SMatt Fleming * 1025a17dae4SMatt Fleming * It should be noted that efi= is parsed in two very different 1035a17dae4SMatt Fleming * environments, first in the early boot environment of the EFI boot 1045a17dae4SMatt Fleming * stub, and subsequently during the kernel boot. 1055a17dae4SMatt Fleming */ 10660f38de7SArd Biesheuvel efi_status_t efi_parse_options(char const *cmdline) 1075a17dae4SMatt Fleming { 10891d150c0SArd Biesheuvel size_t len = strlen(cmdline) + 1; 10991d150c0SArd Biesheuvel efi_status_t status; 11091d150c0SArd Biesheuvel char *str, *buf; 1115a17dae4SMatt Fleming 11291d150c0SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf); 11391d150c0SArd Biesheuvel if (status != EFI_SUCCESS) 11491d150c0SArd Biesheuvel return status; 11591d150c0SArd Biesheuvel 11691d150c0SArd Biesheuvel str = skip_spaces(memcpy(buf, cmdline, len)); 11791d150c0SArd Biesheuvel 11891d150c0SArd Biesheuvel while (*str) { 11991d150c0SArd Biesheuvel char *param, *val; 12091d150c0SArd Biesheuvel 12191d150c0SArd Biesheuvel str = next_arg(str, ¶m, &val); 12291d150c0SArd Biesheuvel 12391d150c0SArd Biesheuvel if (!strcmp(param, "nokaslr")) { 1247d4e323dSArd Biesheuvel efi_nokaslr = true; 12591d150c0SArd Biesheuvel } else if (!strcmp(param, "quiet")) { 12623d5b73fSArvind Sankar efi_loglevel = CONSOLE_LOGLEVEL_QUIET; 12779d3219dSArd Biesheuvel } else if (!strcmp(param, "noinitrd")) { 12879d3219dSArd Biesheuvel efi_noinitrd = true; 12991d150c0SArd Biesheuvel } else if (!strcmp(param, "efi") && val) { 13091d150c0SArd Biesheuvel efi_nochunk = parse_option_str(val, "nochunk"); 13191d150c0SArd Biesheuvel efi_novamap = parse_option_str(val, "novamap"); 132eeff7d63SArd Biesheuvel 13391d150c0SArd Biesheuvel efi_nosoftreserve = IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) && 13491d150c0SArd Biesheuvel parse_option_str(val, "nosoftreserve"); 1355a17dae4SMatt Fleming 13691d150c0SArd Biesheuvel if (parse_option_str(val, "disable_early_pci_dma")) 1374444f854SMatthew Garrett efi_disable_pci_dma = true; 13891d150c0SArd Biesheuvel if (parse_option_str(val, "no_disable_early_pci_dma")) 1394444f854SMatthew Garrett efi_disable_pci_dma = false; 14023d5b73fSArvind Sankar if (parse_option_str(val, "debug")) 14123d5b73fSArvind Sankar efi_loglevel = CONSOLE_LOGLEVEL_DEBUG; 142fffb6804SArvind Sankar } else if (!strcmp(param, "video") && 143fffb6804SArvind Sankar val && strstarts(val, "efifb:")) { 144fffb6804SArvind Sankar efi_parse_option_graphics(val + strlen("efifb:")); 1454444f854SMatthew Garrett } 1465a17dae4SMatt Fleming } 14791d150c0SArd Biesheuvel efi_bs_call(free_pool, buf); 1485a17dae4SMatt Fleming return EFI_SUCCESS; 1495a17dae4SMatt Fleming } 150f4f75ad5SArd Biesheuvel 151f4f75ad5SArd Biesheuvel /* 152f4f75ad5SArd Biesheuvel * Get the number of UTF-8 bytes corresponding to an UTF-16 character. 153f4f75ad5SArd Biesheuvel * This overestimates for surrogates, but that is okay. 154f4f75ad5SArd Biesheuvel */ 155f4f75ad5SArd Biesheuvel static int efi_utf8_bytes(u16 c) 156f4f75ad5SArd Biesheuvel { 157f4f75ad5SArd Biesheuvel return 1 + (c >= 0x80) + (c >= 0x800); 158f4f75ad5SArd Biesheuvel } 159f4f75ad5SArd Biesheuvel 160f4f75ad5SArd Biesheuvel /* 161f4f75ad5SArd Biesheuvel * Convert an UTF-16 string, not necessarily null terminated, to UTF-8. 162f4f75ad5SArd Biesheuvel */ 163f4f75ad5SArd Biesheuvel static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n) 164f4f75ad5SArd Biesheuvel { 165f4f75ad5SArd Biesheuvel unsigned int c; 166f4f75ad5SArd Biesheuvel 167f4f75ad5SArd Biesheuvel while (n--) { 168f4f75ad5SArd Biesheuvel c = *src++; 169f4f75ad5SArd Biesheuvel if (n && c >= 0xd800 && c <= 0xdbff && 170f4f75ad5SArd Biesheuvel *src >= 0xdc00 && *src <= 0xdfff) { 171f4f75ad5SArd Biesheuvel c = 0x10000 + ((c & 0x3ff) << 10) + (*src & 0x3ff); 172f4f75ad5SArd Biesheuvel src++; 173f4f75ad5SArd Biesheuvel n--; 174f4f75ad5SArd Biesheuvel } 175f4f75ad5SArd Biesheuvel if (c >= 0xd800 && c <= 0xdfff) 176f4f75ad5SArd Biesheuvel c = 0xfffd; /* Unmatched surrogate */ 177f4f75ad5SArd Biesheuvel if (c < 0x80) { 178f4f75ad5SArd Biesheuvel *dst++ = c; 179f4f75ad5SArd Biesheuvel continue; 180f4f75ad5SArd Biesheuvel } 181f4f75ad5SArd Biesheuvel if (c < 0x800) { 182f4f75ad5SArd Biesheuvel *dst++ = 0xc0 + (c >> 6); 183f4f75ad5SArd Biesheuvel goto t1; 184f4f75ad5SArd Biesheuvel } 185f4f75ad5SArd Biesheuvel if (c < 0x10000) { 186f4f75ad5SArd Biesheuvel *dst++ = 0xe0 + (c >> 12); 187f4f75ad5SArd Biesheuvel goto t2; 188f4f75ad5SArd Biesheuvel } 189f4f75ad5SArd Biesheuvel *dst++ = 0xf0 + (c >> 18); 190f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 12) & 0x3f); 191f4f75ad5SArd Biesheuvel t2: 192f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 6) & 0x3f); 193f4f75ad5SArd Biesheuvel t1: 194f4f75ad5SArd Biesheuvel *dst++ = 0x80 + (c & 0x3f); 195f4f75ad5SArd Biesheuvel } 196f4f75ad5SArd Biesheuvel 197f4f75ad5SArd Biesheuvel return dst; 198f4f75ad5SArd Biesheuvel } 199f4f75ad5SArd Biesheuvel 200f4f75ad5SArd Biesheuvel /* 201f4f75ad5SArd Biesheuvel * Convert the unicode UEFI command line to ASCII to pass to kernel. 202f4f75ad5SArd Biesheuvel * Size of memory allocated return in *cmd_line_len. 203f4f75ad5SArd Biesheuvel * Returns NULL on error. 204f4f75ad5SArd Biesheuvel */ 205cd33a5c1SArd Biesheuvel char *efi_convert_cmdline(efi_loaded_image_t *image, 2061e45bf73SArd Biesheuvel int *cmd_line_len, unsigned long max_addr) 207f4f75ad5SArd Biesheuvel { 208f4f75ad5SArd Biesheuvel const u16 *s2; 209f4f75ad5SArd Biesheuvel u8 *s1 = NULL; 210f4f75ad5SArd Biesheuvel unsigned long cmdline_addr = 0; 211f7b85b33SArd Biesheuvel int load_options_chars = efi_table_attr(image, load_options_size) / 2; 212f7b85b33SArd Biesheuvel const u16 *options = efi_table_attr(image, load_options); 213f4f75ad5SArd Biesheuvel int options_bytes = 0; /* UTF-8 bytes */ 214f4f75ad5SArd Biesheuvel int options_chars = 0; /* UTF-16 chars */ 215f4f75ad5SArd Biesheuvel efi_status_t status; 216f4f75ad5SArd Biesheuvel u16 zero = 0; 217f4f75ad5SArd Biesheuvel 218f4f75ad5SArd Biesheuvel if (options) { 219f4f75ad5SArd Biesheuvel s2 = options; 220f4f75ad5SArd Biesheuvel while (*s2 && *s2 != '\n' 221f4f75ad5SArd Biesheuvel && options_chars < load_options_chars) { 222f4f75ad5SArd Biesheuvel options_bytes += efi_utf8_bytes(*s2++); 223f4f75ad5SArd Biesheuvel options_chars++; 224f4f75ad5SArd Biesheuvel } 225f4f75ad5SArd Biesheuvel } 226f4f75ad5SArd Biesheuvel 227f4f75ad5SArd Biesheuvel if (!options_chars) { 228f4f75ad5SArd Biesheuvel /* No command line options, so return empty string*/ 229f4f75ad5SArd Biesheuvel options = &zero; 230f4f75ad5SArd Biesheuvel } 231f4f75ad5SArd Biesheuvel 232f4f75ad5SArd Biesheuvel options_bytes++; /* NUL termination */ 233f4f75ad5SArd Biesheuvel 2341e45bf73SArd Biesheuvel status = efi_allocate_pages(options_bytes, &cmdline_addr, max_addr); 235f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 236f4f75ad5SArd Biesheuvel return NULL; 237f4f75ad5SArd Biesheuvel 238f4f75ad5SArd Biesheuvel s1 = (u8 *)cmdline_addr; 239f4f75ad5SArd Biesheuvel s2 = (const u16 *)options; 240f4f75ad5SArd Biesheuvel 241f4f75ad5SArd Biesheuvel s1 = efi_utf16_to_utf8(s1, s2, options_chars); 242f4f75ad5SArd Biesheuvel *s1 = '\0'; 243f4f75ad5SArd Biesheuvel 244f4f75ad5SArd Biesheuvel *cmd_line_len = options_bytes; 245f4f75ad5SArd Biesheuvel return (char *)cmdline_addr; 246f4f75ad5SArd Biesheuvel } 247fc07716bSJeffrey Hugo 248fc07716bSJeffrey Hugo /* 249fc07716bSJeffrey Hugo * Handle calling ExitBootServices according to the requirements set out by the 250fc07716bSJeffrey Hugo * spec. Obtains the current memory map, and returns that info after calling 251fc07716bSJeffrey Hugo * ExitBootServices. The client must specify a function to perform any 252fc07716bSJeffrey Hugo * processing of the memory map data prior to ExitBootServices. A client 253fc07716bSJeffrey Hugo * specific structure may be passed to the function via priv. The client 254fc07716bSJeffrey Hugo * function may be called multiple times. 255fc07716bSJeffrey Hugo */ 256cd33a5c1SArd Biesheuvel efi_status_t efi_exit_boot_services(void *handle, 257fc07716bSJeffrey Hugo struct efi_boot_memmap *map, 258fc07716bSJeffrey Hugo void *priv, 259fc07716bSJeffrey Hugo efi_exit_boot_map_processing priv_func) 260fc07716bSJeffrey Hugo { 261fc07716bSJeffrey Hugo efi_status_t status; 262fc07716bSJeffrey Hugo 263cd33a5c1SArd Biesheuvel status = efi_get_memory_map(map); 264fc07716bSJeffrey Hugo 265fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 266fc07716bSJeffrey Hugo goto fail; 267fc07716bSJeffrey Hugo 268cd33a5c1SArd Biesheuvel status = priv_func(map, priv); 269fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 270fc07716bSJeffrey Hugo goto free_map; 271fc07716bSJeffrey Hugo 2724444f854SMatthew Garrett if (efi_disable_pci_dma) 2734444f854SMatthew Garrett efi_pci_disable_bridge_busmaster(); 2744444f854SMatthew Garrett 275966291f6SArd Biesheuvel status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); 276fc07716bSJeffrey Hugo 277fc07716bSJeffrey Hugo if (status == EFI_INVALID_PARAMETER) { 278fc07716bSJeffrey Hugo /* 279fc07716bSJeffrey Hugo * The memory map changed between efi_get_memory_map() and 280fc07716bSJeffrey Hugo * exit_boot_services(). Per the UEFI Spec v2.6, Section 6.4: 281fc07716bSJeffrey Hugo * EFI_BOOT_SERVICES.ExitBootServices we need to get the 282fc07716bSJeffrey Hugo * updated map, and try again. The spec implies one retry 283fc07716bSJeffrey Hugo * should be sufficent, which is confirmed against the EDK2 284fc07716bSJeffrey Hugo * implementation. Per the spec, we can only invoke 285fc07716bSJeffrey Hugo * get_memory_map() and exit_boot_services() - we cannot alloc 286fc07716bSJeffrey Hugo * so efi_get_memory_map() cannot be used, and we must reuse 287fc07716bSJeffrey Hugo * the buffer. For all practical purposes, the headroom in the 288fc07716bSJeffrey Hugo * buffer should account for any changes in the map so the call 289fc07716bSJeffrey Hugo * to get_memory_map() is expected to succeed here. 290fc07716bSJeffrey Hugo */ 291fc07716bSJeffrey Hugo *map->map_size = *map->buff_size; 292966291f6SArd Biesheuvel status = efi_bs_call(get_memory_map, 293fc07716bSJeffrey Hugo map->map_size, 294fc07716bSJeffrey Hugo *map->map, 295fc07716bSJeffrey Hugo map->key_ptr, 296fc07716bSJeffrey Hugo map->desc_size, 297fc07716bSJeffrey Hugo map->desc_ver); 298fc07716bSJeffrey Hugo 299fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 300fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 301fc07716bSJeffrey Hugo goto fail; 302fc07716bSJeffrey Hugo 303cd33a5c1SArd Biesheuvel status = priv_func(map, priv); 304fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 305fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 306fc07716bSJeffrey Hugo goto fail; 307fc07716bSJeffrey Hugo 308966291f6SArd Biesheuvel status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); 309fc07716bSJeffrey Hugo } 310fc07716bSJeffrey Hugo 311fc07716bSJeffrey Hugo /* exit_boot_services() was called, thus cannot free */ 312fc07716bSJeffrey Hugo if (status != EFI_SUCCESS) 313fc07716bSJeffrey Hugo goto fail; 314fc07716bSJeffrey Hugo 315fc07716bSJeffrey Hugo return EFI_SUCCESS; 316fc07716bSJeffrey Hugo 317fc07716bSJeffrey Hugo free_map: 318966291f6SArd Biesheuvel efi_bs_call(free_pool, *map->map); 319fc07716bSJeffrey Hugo fail: 320fc07716bSJeffrey Hugo return status; 321fc07716bSJeffrey Hugo } 32282d736acSMatthew Garrett 323cd33a5c1SArd Biesheuvel void *get_efi_config_table(efi_guid_t guid) 32482d736acSMatthew Garrett { 325ccc27ae7SArd Biesheuvel unsigned long tables = efi_table_attr(efi_system_table, tables); 326ccc27ae7SArd Biesheuvel int nr_tables = efi_table_attr(efi_system_table, nr_tables); 327f958efe9SArd Biesheuvel int i; 328f958efe9SArd Biesheuvel 329f958efe9SArd Biesheuvel for (i = 0; i < nr_tables; i++) { 330f958efe9SArd Biesheuvel efi_config_table_t *t = (void *)tables; 331f958efe9SArd Biesheuvel 332f958efe9SArd Biesheuvel if (efi_guidcmp(t->guid, guid) == 0) 33399ea8b1dSArd Biesheuvel return efi_table_attr(t, table); 334f958efe9SArd Biesheuvel 335f958efe9SArd Biesheuvel tables += efi_is_native() ? sizeof(efi_config_table_t) 336f958efe9SArd Biesheuvel : sizeof(efi_config_table_32_t); 337f958efe9SArd Biesheuvel } 338f958efe9SArd Biesheuvel return NULL; 33982d736acSMatthew Garrett } 340dc29da14SArd Biesheuvel 341ec93fc37SArd Biesheuvel /* 342ec93fc37SArd Biesheuvel * The LINUX_EFI_INITRD_MEDIA_GUID vendor media device path below provides a way 343ec93fc37SArd Biesheuvel * for the firmware or bootloader to expose the initrd data directly to the stub 344ec93fc37SArd Biesheuvel * via the trivial LoadFile2 protocol, which is defined in the UEFI spec, and is 345ec93fc37SArd Biesheuvel * very easy to implement. It is a simple Linux initrd specific conduit between 346ec93fc37SArd Biesheuvel * kernel and firmware, allowing us to put the EFI stub (being part of the 347ec93fc37SArd Biesheuvel * kernel) in charge of where and when to load the initrd, while leaving it up 348ec93fc37SArd Biesheuvel * to the firmware to decide whether it needs to expose its filesystem hierarchy 349ec93fc37SArd Biesheuvel * via EFI protocols. 350ec93fc37SArd Biesheuvel */ 351ec93fc37SArd Biesheuvel static const struct { 352ec93fc37SArd Biesheuvel struct efi_vendor_dev_path vendor; 353ec93fc37SArd Biesheuvel struct efi_generic_dev_path end; 354ec93fc37SArd Biesheuvel } __packed initrd_dev_path = { 355ec93fc37SArd Biesheuvel { 356ec93fc37SArd Biesheuvel { 357ec93fc37SArd Biesheuvel EFI_DEV_MEDIA, 358ec93fc37SArd Biesheuvel EFI_DEV_MEDIA_VENDOR, 359ec93fc37SArd Biesheuvel sizeof(struct efi_vendor_dev_path), 360ec93fc37SArd Biesheuvel }, 361ec93fc37SArd Biesheuvel LINUX_EFI_INITRD_MEDIA_GUID 362ec93fc37SArd Biesheuvel }, { 363ec93fc37SArd Biesheuvel EFI_DEV_END_PATH, 364ec93fc37SArd Biesheuvel EFI_DEV_END_ENTIRE, 365ec93fc37SArd Biesheuvel sizeof(struct efi_generic_dev_path) 366ec93fc37SArd Biesheuvel } 367ec93fc37SArd Biesheuvel }; 368ec93fc37SArd Biesheuvel 369ec93fc37SArd Biesheuvel /** 370ec93fc37SArd Biesheuvel * efi_load_initrd_dev_path - load the initrd from the Linux initrd device path 371ec93fc37SArd Biesheuvel * @load_addr: pointer to store the address where the initrd was loaded 372ec93fc37SArd Biesheuvel * @load_size: pointer to store the size of the loaded initrd 373ec93fc37SArd Biesheuvel * @max: upper limit for the initrd memory allocation 374ec93fc37SArd Biesheuvel * @return: %EFI_SUCCESS if the initrd was loaded successfully, in which 375ec93fc37SArd Biesheuvel * case @load_addr and @load_size are assigned accordingly 376ec93fc37SArd Biesheuvel * %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd 377ec93fc37SArd Biesheuvel * device path 378ec93fc37SArd Biesheuvel * %EFI_INVALID_PARAMETER if load_addr == NULL or load_size == NULL 379ec93fc37SArd Biesheuvel * %EFI_OUT_OF_RESOURCES if memory allocation failed 380ec93fc37SArd Biesheuvel * %EFI_LOAD_ERROR in all other cases 381ec93fc37SArd Biesheuvel */ 382f61900fdSArvind Sankar static 383ec93fc37SArd Biesheuvel efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr, 384ec93fc37SArd Biesheuvel unsigned long *load_size, 385ec93fc37SArd Biesheuvel unsigned long max) 386ec93fc37SArd Biesheuvel { 387ec93fc37SArd Biesheuvel efi_guid_t lf2_proto_guid = EFI_LOAD_FILE2_PROTOCOL_GUID; 388ec93fc37SArd Biesheuvel efi_device_path_protocol_t *dp; 389ec93fc37SArd Biesheuvel efi_load_file2_protocol_t *lf2; 390ec93fc37SArd Biesheuvel unsigned long initrd_addr; 391ec93fc37SArd Biesheuvel unsigned long initrd_size; 392ec93fc37SArd Biesheuvel efi_handle_t handle; 393ec93fc37SArd Biesheuvel efi_status_t status; 394ec93fc37SArd Biesheuvel 395ec93fc37SArd Biesheuvel dp = (efi_device_path_protocol_t *)&initrd_dev_path; 396ec93fc37SArd Biesheuvel status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle); 397ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 398ec93fc37SArd Biesheuvel return status; 399ec93fc37SArd Biesheuvel 400ec93fc37SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, &lf2_proto_guid, 401ec93fc37SArd Biesheuvel (void **)&lf2); 402ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 403ec93fc37SArd Biesheuvel return status; 404ec93fc37SArd Biesheuvel 405ec93fc37SArd Biesheuvel status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, NULL); 406ec93fc37SArd Biesheuvel if (status != EFI_BUFFER_TOO_SMALL) 407ec93fc37SArd Biesheuvel return EFI_LOAD_ERROR; 408ec93fc37SArd Biesheuvel 409ec93fc37SArd Biesheuvel status = efi_allocate_pages(initrd_size, &initrd_addr, max); 410ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) 411ec93fc37SArd Biesheuvel return status; 412ec93fc37SArd Biesheuvel 413ec93fc37SArd Biesheuvel status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, 414ec93fc37SArd Biesheuvel (void *)initrd_addr); 415ec93fc37SArd Biesheuvel if (status != EFI_SUCCESS) { 416ec93fc37SArd Biesheuvel efi_free(initrd_size, initrd_addr); 417ec93fc37SArd Biesheuvel return EFI_LOAD_ERROR; 418ec93fc37SArd Biesheuvel } 419ec93fc37SArd Biesheuvel 420ec93fc37SArd Biesheuvel *load_addr = initrd_addr; 421ec93fc37SArd Biesheuvel *load_size = initrd_size; 422ec93fc37SArd Biesheuvel return EFI_SUCCESS; 423ec93fc37SArd Biesheuvel } 424f61900fdSArvind Sankar 425f61900fdSArvind Sankar static 426f61900fdSArvind Sankar efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image, 427f61900fdSArvind Sankar unsigned long *load_addr, 428f61900fdSArvind Sankar unsigned long *load_size, 429f61900fdSArvind Sankar unsigned long soft_limit, 430f61900fdSArvind Sankar unsigned long hard_limit) 431f61900fdSArvind Sankar { 432f61900fdSArvind Sankar if (!IS_ENABLED(CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER) || 433f61900fdSArvind Sankar (IS_ENABLED(CONFIG_X86) && (!efi_is_native() || image == NULL))) { 434f61900fdSArvind Sankar *load_addr = *load_size = 0; 435f61900fdSArvind Sankar return EFI_SUCCESS; 436f61900fdSArvind Sankar } 437f61900fdSArvind Sankar 438f61900fdSArvind Sankar return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2, 439f61900fdSArvind Sankar soft_limit, hard_limit, 440f61900fdSArvind Sankar load_addr, load_size); 441f61900fdSArvind Sankar } 442f61900fdSArvind Sankar 443f61900fdSArvind Sankar efi_status_t efi_load_initrd(efi_loaded_image_t *image, 444f61900fdSArvind Sankar unsigned long *load_addr, 445f61900fdSArvind Sankar unsigned long *load_size, 446f61900fdSArvind Sankar unsigned long soft_limit, 447f61900fdSArvind Sankar unsigned long hard_limit) 448f61900fdSArvind Sankar { 449f61900fdSArvind Sankar efi_status_t status; 450f61900fdSArvind Sankar 451f61900fdSArvind Sankar if (!load_addr || !load_size) 452f61900fdSArvind Sankar return EFI_INVALID_PARAMETER; 453f61900fdSArvind Sankar 454f61900fdSArvind Sankar status = efi_load_initrd_dev_path(load_addr, load_size, hard_limit); 455f61900fdSArvind Sankar if (status == EFI_SUCCESS) { 456f61900fdSArvind Sankar efi_info("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n"); 457f61900fdSArvind Sankar } else if (status == EFI_NOT_FOUND) { 458f61900fdSArvind Sankar status = efi_load_initrd_cmdline(image, load_addr, load_size, 459f61900fdSArvind Sankar soft_limit, hard_limit); 460f61900fdSArvind Sankar if (status == EFI_SUCCESS && *load_size > 0) 461f61900fdSArvind Sankar efi_info("Loaded initrd from command line option\n"); 462f61900fdSArvind Sankar } 463f61900fdSArvind Sankar 464f61900fdSArvind Sankar return status; 465f61900fdSArvind Sankar } 466