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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Helper functions used by the EFI stub on multiple
0004  * architectures. This should be #included by the EFI stub
0005  * implementation files.
0006  *
0007  * Copyright 2011 Intel Corporation; author Matt Fleming
0008  */
0009 
0010 #include <linux/stdarg.h>
0011 
0012 #include <linux/ctype.h>
0013 #include <linux/efi.h>
0014 #include <linux/kernel.h>
0015 #include <linux/printk.h> /* For CONSOLE_LOGLEVEL_* */
0016 #include <asm/efi.h>
0017 #include <asm/setup.h>
0018 
0019 #include "efistub.h"
0020 
0021 bool efi_nochunk;
0022 bool efi_nokaslr = !IS_ENABLED(CONFIG_RANDOMIZE_BASE);
0023 int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
0024 bool efi_novamap;
0025 
0026 static bool efi_noinitrd;
0027 static bool efi_nosoftreserve;
0028 static bool efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA);
0029 
0030 bool __pure __efi_soft_reserve_enabled(void)
0031 {
0032     return !efi_nosoftreserve;
0033 }
0034 
0035 /**
0036  * efi_char16_puts() - Write a UCS-2 encoded string to the console
0037  * @str:    UCS-2 encoded string
0038  */
0039 void efi_char16_puts(efi_char16_t *str)
0040 {
0041     efi_call_proto(efi_table_attr(efi_system_table, con_out),
0042                output_string, str);
0043 }
0044 
0045 static
0046 u32 utf8_to_utf32(const u8 **s8)
0047 {
0048     u32 c32;
0049     u8 c0, cx;
0050     size_t clen, i;
0051 
0052     c0 = cx = *(*s8)++;
0053     /*
0054      * The position of the most-significant 0 bit gives us the length of
0055      * a multi-octet encoding.
0056      */
0057     for (clen = 0; cx & 0x80; ++clen)
0058         cx <<= 1;
0059     /*
0060      * If the 0 bit is in position 8, this is a valid single-octet
0061      * encoding. If the 0 bit is in position 7 or positions 1-3, the
0062      * encoding is invalid.
0063      * In either case, we just return the first octet.
0064      */
0065     if (clen < 2 || clen > 4)
0066         return c0;
0067     /* Get the bits from the first octet. */
0068     c32 = cx >> clen--;
0069     for (i = 0; i < clen; ++i) {
0070         /* Trailing octets must have 10 in most significant bits. */
0071         cx = (*s8)[i] ^ 0x80;
0072         if (cx & 0xc0)
0073             return c0;
0074         c32 = (c32 << 6) | cx;
0075     }
0076     /*
0077      * Check for validity:
0078      * - The character must be in the Unicode range.
0079      * - It must not be a surrogate.
0080      * - It must be encoded using the correct number of octets.
0081      */
0082     if (c32 > 0x10ffff ||
0083         (c32 & 0xf800) == 0xd800 ||
0084         clen != (c32 >= 0x80) + (c32 >= 0x800) + (c32 >= 0x10000))
0085         return c0;
0086     *s8 += clen;
0087     return c32;
0088 }
0089 
0090 /**
0091  * efi_puts() - Write a UTF-8 encoded string to the console
0092  * @str:    UTF-8 encoded string
0093  */
0094 void efi_puts(const char *str)
0095 {
0096     efi_char16_t buf[128];
0097     size_t pos = 0, lim = ARRAY_SIZE(buf);
0098     const u8 *s8 = (const u8 *)str;
0099     u32 c32;
0100 
0101     while (*s8) {
0102         if (*s8 == '\n')
0103             buf[pos++] = L'\r';
0104         c32 = utf8_to_utf32(&s8);
0105         if (c32 < 0x10000) {
0106             /* Characters in plane 0 use a single word. */
0107             buf[pos++] = c32;
0108         } else {
0109             /*
0110              * Characters in other planes encode into a surrogate
0111              * pair.
0112              */
0113             buf[pos++] = (0xd800 - (0x10000 >> 10)) + (c32 >> 10);
0114             buf[pos++] = 0xdc00 + (c32 & 0x3ff);
0115         }
0116         if (*s8 == '\0' || pos >= lim - 2) {
0117             buf[pos] = L'\0';
0118             efi_char16_puts(buf);
0119             pos = 0;
0120         }
0121     }
0122 }
0123 
0124 /**
0125  * efi_printk() - Print a kernel message
0126  * @fmt:    format string
0127  *
0128  * The first letter of the format string is used to determine the logging level
0129  * of the message. If the level is less then the current EFI logging level, the
0130  * message is suppressed. The message will be truncated to 255 bytes.
0131  *
0132  * Return:  number of printed characters
0133  */
0134 int efi_printk(const char *fmt, ...)
0135 {
0136     char printf_buf[256];
0137     va_list args;
0138     int printed;
0139     int loglevel = printk_get_level(fmt);
0140 
0141     switch (loglevel) {
0142     case '0' ... '9':
0143         loglevel -= '0';
0144         break;
0145     default:
0146         /*
0147          * Use loglevel -1 for cases where we just want to print to
0148          * the screen.
0149          */
0150         loglevel = -1;
0151         break;
0152     }
0153 
0154     if (loglevel >= efi_loglevel)
0155         return 0;
0156 
0157     if (loglevel >= 0)
0158         efi_puts("EFI stub: ");
0159 
0160     fmt = printk_skip_level(fmt);
0161 
0162     va_start(args, fmt);
0163     printed = vsnprintf(printf_buf, sizeof(printf_buf), fmt, args);
0164     va_end(args);
0165 
0166     efi_puts(printf_buf);
0167     if (printed >= sizeof(printf_buf)) {
0168         efi_puts("[Message truncated]\n");
0169         return -1;
0170     }
0171 
0172     return printed;
0173 }
0174 
0175 /**
0176  * efi_parse_options() - Parse EFI command line options
0177  * @cmdline:    kernel command line
0178  *
0179  * Parse the ASCII string @cmdline for EFI options, denoted by the efi=
0180  * option, e.g. efi=nochunk.
0181  *
0182  * It should be noted that efi= is parsed in two very different
0183  * environments, first in the early boot environment of the EFI boot
0184  * stub, and subsequently during the kernel boot.
0185  *
0186  * Return:  status code
0187  */
0188 efi_status_t efi_parse_options(char const *cmdline)
0189 {
0190     size_t len;
0191     efi_status_t status;
0192     char *str, *buf;
0193 
0194     if (!cmdline)
0195         return EFI_SUCCESS;
0196 
0197     len = strnlen(cmdline, COMMAND_LINE_SIZE - 1) + 1;
0198     status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf);
0199     if (status != EFI_SUCCESS)
0200         return status;
0201 
0202     memcpy(buf, cmdline, len - 1);
0203     buf[len - 1] = '\0';
0204     str = skip_spaces(buf);
0205 
0206     while (*str) {
0207         char *param, *val;
0208 
0209         str = next_arg(str, &param, &val);
0210         if (!val && !strcmp(param, "--"))
0211             break;
0212 
0213         if (!strcmp(param, "nokaslr")) {
0214             efi_nokaslr = true;
0215         } else if (!strcmp(param, "quiet")) {
0216             efi_loglevel = CONSOLE_LOGLEVEL_QUIET;
0217         } else if (!strcmp(param, "noinitrd")) {
0218             efi_noinitrd = true;
0219         } else if (!strcmp(param, "efi") && val) {
0220             efi_nochunk = parse_option_str(val, "nochunk");
0221             efi_novamap = parse_option_str(val, "novamap");
0222 
0223             efi_nosoftreserve = IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) &&
0224                         parse_option_str(val, "nosoftreserve");
0225 
0226             if (parse_option_str(val, "disable_early_pci_dma"))
0227                 efi_disable_pci_dma = true;
0228             if (parse_option_str(val, "no_disable_early_pci_dma"))
0229                 efi_disable_pci_dma = false;
0230             if (parse_option_str(val, "debug"))
0231                 efi_loglevel = CONSOLE_LOGLEVEL_DEBUG;
0232         } else if (!strcmp(param, "video") &&
0233                val && strstarts(val, "efifb:")) {
0234             efi_parse_option_graphics(val + strlen("efifb:"));
0235         }
0236     }
0237     efi_bs_call(free_pool, buf);
0238     return EFI_SUCCESS;
0239 }
0240 
0241 /*
0242  * The EFI_LOAD_OPTION descriptor has the following layout:
0243  *  u32 Attributes;
0244  *  u16 FilePathListLength;
0245  *  u16 Description[];
0246  *  efi_device_path_protocol_t FilePathList[];
0247  *  u8 OptionalData[];
0248  *
0249  * This function validates and unpacks the variable-size data fields.
0250  */
0251 static
0252 bool efi_load_option_unpack(efi_load_option_unpacked_t *dest,
0253                 const efi_load_option_t *src, size_t size)
0254 {
0255     const void *pos;
0256     u16 c;
0257     efi_device_path_protocol_t header;
0258     const efi_char16_t *description;
0259     const efi_device_path_protocol_t *file_path_list;
0260 
0261     if (size < offsetof(efi_load_option_t, variable_data))
0262         return false;
0263     pos = src->variable_data;
0264     size -= offsetof(efi_load_option_t, variable_data);
0265 
0266     if ((src->attributes & ~EFI_LOAD_OPTION_MASK) != 0)
0267         return false;
0268 
0269     /* Scan description. */
0270     description = pos;
0271     do {
0272         if (size < sizeof(c))
0273             return false;
0274         c = *(const u16 *)pos;
0275         pos += sizeof(c);
0276         size -= sizeof(c);
0277     } while (c != L'\0');
0278 
0279     /* Scan file_path_list. */
0280     file_path_list = pos;
0281     do {
0282         if (size < sizeof(header))
0283             return false;
0284         header = *(const efi_device_path_protocol_t *)pos;
0285         if (header.length < sizeof(header))
0286             return false;
0287         if (size < header.length)
0288             return false;
0289         pos += header.length;
0290         size -= header.length;
0291     } while ((header.type != EFI_DEV_END_PATH && header.type != EFI_DEV_END_PATH2) ||
0292          (header.sub_type != EFI_DEV_END_ENTIRE));
0293     if (pos != (const void *)file_path_list + src->file_path_list_length)
0294         return false;
0295 
0296     dest->attributes = src->attributes;
0297     dest->file_path_list_length = src->file_path_list_length;
0298     dest->description = description;
0299     dest->file_path_list = file_path_list;
0300     dest->optional_data_size = size;
0301     dest->optional_data = size ? pos : NULL;
0302 
0303     return true;
0304 }
0305 
0306 /*
0307  * At least some versions of Dell firmware pass the entire contents of the
0308  * Boot#### variable, i.e. the EFI_LOAD_OPTION descriptor, rather than just the
0309  * OptionalData field.
0310  *
0311  * Detect this case and extract OptionalData.
0312  */
0313 void efi_apply_loadoptions_quirk(const void **load_options, int *load_options_size)
0314 {
0315     const efi_load_option_t *load_option = *load_options;
0316     efi_load_option_unpacked_t load_option_unpacked;
0317 
0318     if (!IS_ENABLED(CONFIG_X86))
0319         return;
0320     if (!load_option)
0321         return;
0322     if (*load_options_size < sizeof(*load_option))
0323         return;
0324     if ((load_option->attributes & ~EFI_LOAD_OPTION_BOOT_MASK) != 0)
0325         return;
0326 
0327     if (!efi_load_option_unpack(&load_option_unpacked, load_option, *load_options_size))
0328         return;
0329 
0330     efi_warn_once(FW_BUG "LoadOptions is an EFI_LOAD_OPTION descriptor\n");
0331     efi_warn_once(FW_BUG "Using OptionalData as a workaround\n");
0332 
0333     *load_options = load_option_unpacked.optional_data;
0334     *load_options_size = load_option_unpacked.optional_data_size;
0335 }
0336 
0337 /*
0338  * Convert the unicode UEFI command line to ASCII to pass to kernel.
0339  * Size of memory allocated return in *cmd_line_len.
0340  * Returns NULL on error.
0341  */
0342 char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len)
0343 {
0344     const u16 *s2;
0345     unsigned long cmdline_addr = 0;
0346     int options_chars = efi_table_attr(image, load_options_size);
0347     const u16 *options = efi_table_attr(image, load_options);
0348     int options_bytes = 0, safe_options_bytes = 0;  /* UTF-8 bytes */
0349     bool in_quote = false;
0350     efi_status_t status;
0351 
0352     efi_apply_loadoptions_quirk((const void **)&options, &options_chars);
0353     options_chars /= sizeof(*options);
0354 
0355     if (options) {
0356         s2 = options;
0357         while (options_bytes < COMMAND_LINE_SIZE && options_chars--) {
0358             u16 c = *s2++;
0359 
0360             if (c < 0x80) {
0361                 if (c == L'\0' || c == L'\n')
0362                     break;
0363                 if (c == L'"')
0364                     in_quote = !in_quote;
0365                 else if (!in_quote && isspace((char)c))
0366                     safe_options_bytes = options_bytes;
0367 
0368                 options_bytes++;
0369                 continue;
0370             }
0371 
0372             /*
0373              * Get the number of UTF-8 bytes corresponding to a
0374              * UTF-16 character.
0375              * The first part handles everything in the BMP.
0376              */
0377             options_bytes += 2 + (c >= 0x800);
0378             /*
0379              * Add one more byte for valid surrogate pairs. Invalid
0380              * surrogates will be replaced with 0xfffd and take up
0381              * only 3 bytes.
0382              */
0383             if ((c & 0xfc00) == 0xd800) {
0384                 /*
0385                  * If the very last word is a high surrogate,
0386                  * we must ignore it since we can't access the
0387                  * low surrogate.
0388                  */
0389                 if (!options_chars) {
0390                     options_bytes -= 3;
0391                 } else if ((*s2 & 0xfc00) == 0xdc00) {
0392                     options_bytes++;
0393                     options_chars--;
0394                     s2++;
0395                 }
0396             }
0397         }
0398         if (options_bytes >= COMMAND_LINE_SIZE) {
0399             options_bytes = safe_options_bytes;
0400             efi_err("Command line is too long: truncated to %d bytes\n",
0401                 options_bytes);
0402         }
0403     }
0404 
0405     options_bytes++;    /* NUL termination */
0406 
0407     status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, options_bytes,
0408                  (void **)&cmdline_addr);
0409     if (status != EFI_SUCCESS)
0410         return NULL;
0411 
0412     snprintf((char *)cmdline_addr, options_bytes, "%.*ls",
0413          options_bytes - 1, options);
0414 
0415     *cmd_line_len = options_bytes;
0416     return (char *)cmdline_addr;
0417 }
0418 
0419 /**
0420  * efi_exit_boot_services() - Exit boot services
0421  * @handle: handle of the exiting image
0422  * @map:    pointer to receive the memory map
0423  * @priv:   argument to be passed to @priv_func
0424  * @priv_func:  function to process the memory map before exiting boot services
0425  *
0426  * Handle calling ExitBootServices according to the requirements set out by the
0427  * spec.  Obtains the current memory map, and returns that info after calling
0428  * ExitBootServices.  The client must specify a function to perform any
0429  * processing of the memory map data prior to ExitBootServices.  A client
0430  * specific structure may be passed to the function via priv.  The client
0431  * function may be called multiple times.
0432  *
0433  * Return:  status code
0434  */
0435 efi_status_t efi_exit_boot_services(void *handle,
0436                     struct efi_boot_memmap *map,
0437                     void *priv,
0438                     efi_exit_boot_map_processing priv_func)
0439 {
0440     efi_status_t status;
0441 
0442     status = efi_get_memory_map(map);
0443 
0444     if (status != EFI_SUCCESS)
0445         goto fail;
0446 
0447     status = priv_func(map, priv);
0448     if (status != EFI_SUCCESS)
0449         goto free_map;
0450 
0451     if (efi_disable_pci_dma)
0452         efi_pci_disable_bridge_busmaster();
0453 
0454     status = efi_bs_call(exit_boot_services, handle, *map->key_ptr);
0455 
0456     if (status == EFI_INVALID_PARAMETER) {
0457         /*
0458          * The memory map changed between efi_get_memory_map() and
0459          * exit_boot_services().  Per the UEFI Spec v2.6, Section 6.4:
0460          * EFI_BOOT_SERVICES.ExitBootServices we need to get the
0461          * updated map, and try again.  The spec implies one retry
0462          * should be sufficent, which is confirmed against the EDK2
0463          * implementation.  Per the spec, we can only invoke
0464          * get_memory_map() and exit_boot_services() - we cannot alloc
0465          * so efi_get_memory_map() cannot be used, and we must reuse
0466          * the buffer.  For all practical purposes, the headroom in the
0467          * buffer should account for any changes in the map so the call
0468          * to get_memory_map() is expected to succeed here.
0469          */
0470         *map->map_size = *map->buff_size;
0471         status = efi_bs_call(get_memory_map,
0472                      map->map_size,
0473                      *map->map,
0474                      map->key_ptr,
0475                      map->desc_size,
0476                      map->desc_ver);
0477 
0478         /* exit_boot_services() was called, thus cannot free */
0479         if (status != EFI_SUCCESS)
0480             goto fail;
0481 
0482         status = priv_func(map, priv);
0483         /* exit_boot_services() was called, thus cannot free */
0484         if (status != EFI_SUCCESS)
0485             goto fail;
0486 
0487         status = efi_bs_call(exit_boot_services, handle, *map->key_ptr);
0488     }
0489 
0490     /* exit_boot_services() was called, thus cannot free */
0491     if (status != EFI_SUCCESS)
0492         goto fail;
0493 
0494     return EFI_SUCCESS;
0495 
0496 free_map:
0497     efi_bs_call(free_pool, *map->map);
0498 fail:
0499     return status;
0500 }
0501 
0502 /**
0503  * get_efi_config_table() - retrieve UEFI configuration table
0504  * @guid:   GUID of the configuration table to be retrieved
0505  * Return:  pointer to the configuration table or NULL
0506  */
0507 void *get_efi_config_table(efi_guid_t guid)
0508 {
0509     unsigned long tables = efi_table_attr(efi_system_table, tables);
0510     int nr_tables = efi_table_attr(efi_system_table, nr_tables);
0511     int i;
0512 
0513     for (i = 0; i < nr_tables; i++) {
0514         efi_config_table_t *t = (void *)tables;
0515 
0516         if (efi_guidcmp(t->guid, guid) == 0)
0517             return efi_table_attr(t, table);
0518 
0519         tables += efi_is_native() ? sizeof(efi_config_table_t)
0520                       : sizeof(efi_config_table_32_t);
0521     }
0522     return NULL;
0523 }
0524 
0525 /*
0526  * The LINUX_EFI_INITRD_MEDIA_GUID vendor media device path below provides a way
0527  * for the firmware or bootloader to expose the initrd data directly to the stub
0528  * via the trivial LoadFile2 protocol, which is defined in the UEFI spec, and is
0529  * very easy to implement. It is a simple Linux initrd specific conduit between
0530  * kernel and firmware, allowing us to put the EFI stub (being part of the
0531  * kernel) in charge of where and when to load the initrd, while leaving it up
0532  * to the firmware to decide whether it needs to expose its filesystem hierarchy
0533  * via EFI protocols.
0534  */
0535 static const struct {
0536     struct efi_vendor_dev_path  vendor;
0537     struct efi_generic_dev_path end;
0538 } __packed initrd_dev_path = {
0539     {
0540         {
0541             EFI_DEV_MEDIA,
0542             EFI_DEV_MEDIA_VENDOR,
0543             sizeof(struct efi_vendor_dev_path),
0544         },
0545         LINUX_EFI_INITRD_MEDIA_GUID
0546     }, {
0547         EFI_DEV_END_PATH,
0548         EFI_DEV_END_ENTIRE,
0549         sizeof(struct efi_generic_dev_path)
0550     }
0551 };
0552 
0553 /**
0554  * efi_load_initrd_dev_path() - load the initrd from the Linux initrd device path
0555  * @load_addr:  pointer to store the address where the initrd was loaded
0556  * @load_size:  pointer to store the size of the loaded initrd
0557  * @max:    upper limit for the initrd memory allocation
0558  *
0559  * Return:
0560  * * %EFI_SUCCESS if the initrd was loaded successfully, in which
0561  *   case @load_addr and @load_size are assigned accordingly
0562  * * %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd device path
0563  * * %EFI_INVALID_PARAMETER if load_addr == NULL or load_size == NULL
0564  * * %EFI_OUT_OF_RESOURCES if memory allocation failed
0565  * * %EFI_LOAD_ERROR in all other cases
0566  */
0567 static
0568 efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr,
0569                       unsigned long *load_size,
0570                       unsigned long max)
0571 {
0572     efi_guid_t lf2_proto_guid = EFI_LOAD_FILE2_PROTOCOL_GUID;
0573     efi_device_path_protocol_t *dp;
0574     efi_load_file2_protocol_t *lf2;
0575     unsigned long initrd_addr;
0576     unsigned long initrd_size;
0577     efi_handle_t handle;
0578     efi_status_t status;
0579 
0580     dp = (efi_device_path_protocol_t *)&initrd_dev_path;
0581     status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle);
0582     if (status != EFI_SUCCESS)
0583         return status;
0584 
0585     status = efi_bs_call(handle_protocol, handle, &lf2_proto_guid,
0586                  (void **)&lf2);
0587     if (status != EFI_SUCCESS)
0588         return status;
0589 
0590     status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, NULL);
0591     if (status != EFI_BUFFER_TOO_SMALL)
0592         return EFI_LOAD_ERROR;
0593 
0594     status = efi_allocate_pages(initrd_size, &initrd_addr, max);
0595     if (status != EFI_SUCCESS)
0596         return status;
0597 
0598     status = efi_call_proto(lf2, load_file, dp, false, &initrd_size,
0599                 (void *)initrd_addr);
0600     if (status != EFI_SUCCESS) {
0601         efi_free(initrd_size, initrd_addr);
0602         return EFI_LOAD_ERROR;
0603     }
0604 
0605     *load_addr = initrd_addr;
0606     *load_size = initrd_size;
0607     return EFI_SUCCESS;
0608 }
0609 
0610 static
0611 efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image,
0612                      unsigned long *load_addr,
0613                      unsigned long *load_size,
0614                      unsigned long soft_limit,
0615                      unsigned long hard_limit)
0616 {
0617     if (!IS_ENABLED(CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER) ||
0618         (IS_ENABLED(CONFIG_X86) && (!efi_is_native() || image == NULL))) {
0619         *load_addr = *load_size = 0;
0620         return EFI_SUCCESS;
0621     }
0622 
0623     return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2,
0624                     soft_limit, hard_limit,
0625                     load_addr, load_size);
0626 }
0627 
0628 static const struct {
0629     efi_tcg2_event_t    event_data;
0630     efi_tcg2_tagged_event_t tagged_event;
0631     u8          tagged_event_data[];
0632 } initrd_tcg2_event = {
0633     {
0634         sizeof(initrd_tcg2_event) + sizeof("Linux initrd"),
0635         {
0636             sizeof(initrd_tcg2_event.event_data.event_header),
0637             EFI_TCG2_EVENT_HEADER_VERSION,
0638             9,
0639             EV_EVENT_TAG,
0640         },
0641     },
0642     {
0643         INITRD_EVENT_TAG_ID,
0644         sizeof("Linux initrd"),
0645     },
0646     { "Linux initrd" },
0647 };
0648 
0649 static void efi_measure_initrd(unsigned long load_addr, unsigned long load_size)
0650 {
0651     efi_guid_t tcg2_guid = EFI_TCG2_PROTOCOL_GUID;
0652     efi_tcg2_protocol_t *tcg2 = NULL;
0653     efi_status_t status;
0654 
0655     efi_bs_call(locate_protocol, &tcg2_guid, NULL, (void **)&tcg2);
0656     if (tcg2) {
0657         status = efi_call_proto(tcg2, hash_log_extend_event,
0658                     0, load_addr, load_size,
0659                     &initrd_tcg2_event.event_data);
0660         if (status != EFI_SUCCESS)
0661             efi_warn("Failed to measure initrd data: 0x%lx\n",
0662                  status);
0663         else
0664             efi_info("Measured initrd data into PCR %d\n",
0665                  initrd_tcg2_event.event_data.event_header.pcr_index);
0666     }
0667 }
0668 
0669 /**
0670  * efi_load_initrd() - Load initial RAM disk
0671  * @image:  EFI loaded image protocol
0672  * @load_addr:  pointer to loaded initrd
0673  * @load_size:  size of loaded initrd
0674  * @soft_limit: preferred address for loading the initrd
0675  * @hard_limit: upper limit address for loading the initrd
0676  *
0677  * Return:  status code
0678  */
0679 efi_status_t efi_load_initrd(efi_loaded_image_t *image,
0680                  unsigned long *load_addr,
0681                  unsigned long *load_size,
0682                  unsigned long soft_limit,
0683                  unsigned long hard_limit)
0684 {
0685     efi_status_t status;
0686 
0687     if (efi_noinitrd) {
0688         *load_addr = *load_size = 0;
0689         status = EFI_SUCCESS;
0690     } else {
0691         status = efi_load_initrd_dev_path(load_addr, load_size, hard_limit);
0692         if (status == EFI_SUCCESS) {
0693             efi_info("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n");
0694             if (*load_size > 0)
0695                 efi_measure_initrd(*load_addr, *load_size);
0696         } else if (status == EFI_NOT_FOUND) {
0697             status = efi_load_initrd_cmdline(image, load_addr, load_size,
0698                              soft_limit, hard_limit);
0699             if (status == EFI_SUCCESS && *load_size > 0)
0700                 efi_info("Loaded initrd from command line option\n");
0701         }
0702         if (status != EFI_SUCCESS) {
0703             efi_err("Failed to load initrd: 0x%lx\n", status);
0704             *load_addr = *load_size = 0;
0705         }
0706     }
0707 
0708     return status;
0709 }
0710 
0711 /**
0712  * efi_wait_for_key() - Wait for key stroke
0713  * @usec:   number of microseconds to wait for key stroke
0714  * @key:    key entered
0715  *
0716  * Wait for up to @usec microseconds for a key stroke.
0717  *
0718  * Return:  status code, EFI_SUCCESS if key received
0719  */
0720 efi_status_t efi_wait_for_key(unsigned long usec, efi_input_key_t *key)
0721 {
0722     efi_event_t events[2], timer;
0723     unsigned long index;
0724     efi_simple_text_input_protocol_t *con_in;
0725     efi_status_t status;
0726 
0727     con_in = efi_table_attr(efi_system_table, con_in);
0728     if (!con_in)
0729         return EFI_UNSUPPORTED;
0730     efi_set_event_at(events, 0, efi_table_attr(con_in, wait_for_key));
0731 
0732     status = efi_bs_call(create_event, EFI_EVT_TIMER, 0, NULL, NULL, &timer);
0733     if (status != EFI_SUCCESS)
0734         return status;
0735 
0736     status = efi_bs_call(set_timer, timer, EfiTimerRelative,
0737                  EFI_100NSEC_PER_USEC * usec);
0738     if (status != EFI_SUCCESS)
0739         return status;
0740     efi_set_event_at(events, 1, timer);
0741 
0742     status = efi_bs_call(wait_for_event, 2, events, &index);
0743     if (status == EFI_SUCCESS) {
0744         if (index == 0)
0745             status = efi_call_proto(con_in, read_keystroke, key);
0746         else
0747             status = EFI_TIMEOUT;
0748     }
0749 
0750     efi_bs_call(close_event, timer);
0751 
0752     return status;
0753 }
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