src/basic/efivars.h

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 #pragma once
   3
   4 #include "forward.h"
   5
   6 #include "sd-id128.h"
   7
   8 #include "efivars-fundamental.h"        /* IWYU pragma: export */
   9
  10 #define EFI_VENDOR_LOADER       SD_ID128_MAKE(4a,67,b0,82,0a,4c,41,cf,b6,c7,44,0b,29,bb,8c,4f)
  11 #define EFI_VENDOR_LOADER_STR   SD_ID128_MAKE_UUID_STR(4a,67,b0,82,0a,4c,41,cf,b6,c7,44,0b,29,bb,8c,4f)
  12 #define EFI_VENDOR_GLOBAL       SD_ID128_MAKE(8b,e4,df,61,93,ca,11,d2,aa,0d,00,e0,98,03,2b,8c)
  13 #define EFI_VENDOR_GLOBAL_STR   SD_ID128_MAKE_UUID_STR(8b,e4,df,61,93,ca,11,d2,aa,0d,00,e0,98,03,2b,8c)
  14 #define EFI_VENDOR_DATABASE     SD_ID128_MAKE(d7,19,b2,cb,3d,3a,45,96,a3,bc,da,d0,0e,67,65,6f)
  15 #define EFI_VENDOR_DATABASE_STR SD_ID128_MAKE_UUID_STR(d7,19,b2,cb,3d,3a,45,96,a3,bc,da,d0,0e,67,65,6f)
  16 #define EFI_VENDOR_SYSTEMD      SD_ID128_MAKE(8c,f2,64,4b,4b,0b,42,8f,93,87,6d,87,60,50,dc,67)
  17 #define EFI_VENDOR_SYSTEMD_STR  SD_ID128_MAKE_UUID_STR(8c,f2,64,4b,4b,0b,42,8f,93,87,6d,87,60,50,dc,67)
  18
  19 #define EFI_VARIABLE_NON_VOLATILE                          UINT32_C(0x00000001)
  20 #define EFI_VARIABLE_BOOTSERVICE_ACCESS                    UINT32_C(0x00000002)
  21 #define EFI_VARIABLE_RUNTIME_ACCESS                        UINT32_C(0x00000004)
  22 #define EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS UINT32_C(0x00000020)
  23
  24 /* Note that the <lowercaseuuid>-<varname> naming scheme is an efivarfs convention, i.e. part of the Linux
  25  * API file system implementation for EFI. EFI itself processes UIDS in binary form.
  26  */
  27
  28 #define EFI_VENDOR_VARIABLE_STR(vendor, name) name "-" vendor
  29
  30 #define EFI_GLOBAL_VARIABLE_STR(name) EFI_VENDOR_VARIABLE_STR(EFI_VENDOR_GLOBAL_STR, name)
  31 #define EFI_LOADER_VARIABLE_STR(name) EFI_VENDOR_VARIABLE_STR(EFI_VENDOR_LOADER_STR, name)
  32 #define EFI_SYSTEMD_VARIABLE_STR(name) EFI_VENDOR_VARIABLE_STR(EFI_VENDOR_SYSTEMD_STR, name)
  33
  34 #define EFIVAR_PATH(variable) "/sys/firmware/efi/efivars/" variable
  35 #define EFIVAR_CACHE_PATH(variable) "/run/systemd/efivars/" variable
  36
  37 #if ENABLE_EFI
  38
  39 int efi_get_variable(const char *variable, uint32_t *attribute, void **ret_value, size_t *ret_size);
  40 int efi_get_variable_string(const char *variable, char **ret);
  41 int efi_get_variable_path(const char *variable, char **ret);
  42 int efi_set_variable(const char *variable, const void *value, size_t size) _nonnull_if_nonzero_(2, 3);
  43 int efi_set_variable_string(const char *variable, const char *p);
  44
  45 bool is_efi_boot(void);
  46 bool is_efi_secure_boot(void);
  47 SecureBootMode efi_get_secure_boot_mode(void);
  48
  49 #else
  50
  51 static inline int efi_get_variable(const char *variable, uint32_t *attribute, void **value, size_t *size) {
  52         return -EOPNOTSUPP;
  53 }
  54
  55 static inline int efi_get_variable_string(const char *variable, char **ret) {
  56         return -EOPNOTSUPP;
  57 }
  58
  59 static inline int efi_get_variable_path(const char *variable, char **ret) {
  60         return -EOPNOTSUPP;
  61 }
  62
  63 static inline int efi_set_variable(const char *variable, const void *value, size_t size) {
  64         return -EOPNOTSUPP;
  65 }
  66
  67 static inline int efi_set_variable_string(const char *variable, const char *p) {
  68         return -EOPNOTSUPP;
  69 }
  70
  71 static inline bool is_efi_boot(void) {
  72         return false;
  73 }
  74
  75 static inline bool is_efi_secure_boot(void) {
  76         return false;
  77 }
  78
  79 static inline SecureBootMode efi_get_secure_boot_mode(void) {
  80         return SECURE_BOOT_UNKNOWN;
  81 }
  82 #endif
  83
  84 char *efi_tilt_backslashes(char *s);