1 files changed, 102 insertions, 0 deletions
diff --git a/src/basic/efivars.h b/src/basic/efivars.h
new file mode 100644
index 0000000..34d697f
--- /dev/null
+++ b/src/basic/efivars.h
@@ -0,0 +1,102 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#if !ENABLE_EFI
+#  include <errno.h>
+#endif
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "sd-id128.h"
+
+#include "efivars-fundamental.h"
+#include "time-util.h"
+
+#define EFI_VENDOR_LOADER       SD_ID128_MAKE(4a,67,b0,82,0a,4c,41,cf,b6,c7,44,0b,29,bb,8c,4f)
+#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)
+#define EFI_VENDOR_GLOBAL       SD_ID128_MAKE(8b,e4,df,61,93,ca,11,d2,aa,0d,00,e0,98,03,2b,8c)
+#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)
+#define EFI_VENDOR_DATABASE     SD_ID128_MAKE(d7,19,b2,cb,3d,3a,45,96,a3,bc,da,d0,0e,67,65,6f)
+#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)
+#define EFI_VENDOR_SYSTEMD      SD_ID128_MAKE(8c,f2,64,4b,4b,0b,42,8f,93,87,6d,87,60,50,dc,67)
+#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)
+
+#define EFI_VARIABLE_NON_VOLATILE       UINT32_C(0x00000001)
+#define EFI_VARIABLE_BOOTSERVICE_ACCESS UINT32_C(0x00000002)
+#define EFI_VARIABLE_RUNTIME_ACCESS     UINT32_C(0x00000004)
+
+/* Note that the <lowercaseuuid>-<varname> naming scheme is an efivarfs convention, i.e. part of the Linux
+ * API file system implementation for EFI. EFI itself processes UIDS in binary form.
+ */
+
+#define EFI_VENDOR_VARIABLE_STR(vendor, name) name "-" vendor
+
+#define EFI_GLOBAL_VARIABLE_STR(name) EFI_VENDOR_VARIABLE_STR(EFI_VENDOR_GLOBAL_STR, name)
+#define EFI_LOADER_VARIABLE_STR(name) EFI_VENDOR_VARIABLE_STR(EFI_VENDOR_LOADER_STR, name)
+#define EFI_SYSTEMD_VARIABLE_STR(name) EFI_VENDOR_VARIABLE_STR(EFI_VENDOR_SYSTEMD_STR, name)
+
+#define EFI_GLOBAL_VARIABLE(name) EFI_GLOBAL_VARIABLE_STR(STRINGIFY(name))
+#define EFI_LOADER_VARIABLE(name) EFI_LOADER_VARIABLE_STR(STRINGIFY(name))
+#define EFI_SYSTEMD_VARIABLE(name) EFI_SYSTEMD_VARIABLE_STR(STRINGIFY(name))
+
+#define EFIVAR_PATH(variable) "/sys/firmware/efi/efivars/" variable
+#define EFIVAR_CACHE_PATH(variable) "/run/systemd/efivars/" variable
+
+#if ENABLE_EFI
+
+int efi_get_variable(const char *variable, uint32_t *attribute, void **ret_value, size_t *ret_size);
+int efi_get_variable_string(const char *variable, char **ret);
+int efi_set_variable(const char *variable, const void *value, size_t size);
+int efi_set_variable_string(const char *variable, const char *p);
+
+bool is_efi_boot(void);
+bool is_efi_secure_boot(void);
+SecureBootMode efi_get_secure_boot_mode(void);
+
+int cache_efi_options_variable(void);
+int systemd_efi_options_variable(char **ret);
+int systemd_efi_options_efivarfs_if_newer(char **ret);
+
+#else
+
+static inline int efi_get_variable(const char *variable, uint32_t *attribute, void **value, size_t *size) {
+        return -EOPNOTSUPP;
+}
+
+static inline int efi_get_variable_string(const char *variable, char **ret) {
+        return -EOPNOTSUPP;
+}
+
+static inline int efi_set_variable(const char *variable, const void *value, size_t size) {
+        return -EOPNOTSUPP;
+}
+
+static inline int efi_set_variable_string(const char *variable, const char *p) {
+        return -EOPNOTSUPP;
+}
+
+static inline bool is_efi_boot(void) {
+        return false;
+}
+
+static inline bool is_efi_secure_boot(void) {
+        return false;
+}
+
+static inline SecureBootMode efi_get_secure_boot_mode(void) {
+        return SECURE_BOOT_UNKNOWN;
+}
+
+static inline int cache_efi_options_variable(void) {
+        return -EOPNOTSUPP;
+}
+
+static inline int systemd_efi_options_variable(char **line) {
+        return -ENODATA;
+}
+
+static inline int systemd_efi_options_efivarfs_if_newer(char **line) {
+        return -ENODATA;
+}
+#endif