1 files changed, 51 insertions, 0 deletions
diff --git a/lib/std/os/uefi/tables/runtime_services.zig b/lib/std/os/uefi/tables/runtime_services.zig
new file mode 100644
index 0000000000..53cb17db50
--- /dev/null
+++ b/lib/std/os/uefi/tables/runtime_services.zig
@@ -0,0 +1,51 @@
+const uefi = @import("std").os.uefi;
+const Guid = uefi.Guid;
+const TableHeader = uefi.tables.TableHeader;
+const Time = uefi.Time;
+const TimeCapabilities = uefi.TimeCapabilities;
+
+/// UEFI Specification, Version 2.8, 4.5
+///
+/// As the runtime_services table may grow with new UEFI versions, it is important to check hdr.header_size.
+///
+/// Some functions may not be supported. Check the RuntimeServicesSupported variable using getVariable.
+/// getVariable is one of the functions that may not be supported. See UEFI Specification, Version 2.8, 8.1.
+///
+/// Some functions may not be called while other functions are running. See UEFI Specification, Version 2.8, 8.1.
+pub const RuntimeServices = extern struct {
+    hdr: TableHeader,
+    getTime: extern fn (*uefi.Time, ?*TimeCapabilities) usize,
+    setTime: usize, // TODO
+    getWakeupTime: usize, // TODO
+    setWakeupTime: usize, // TODO
+    setVirtualAddressMap: usize, // TODO
+    convertPointer: usize, // TODO
+    getVariable: extern fn ([*]const u16, *align(8) const Guid, ?*u32, *usize, ?*c_void) usize,
+    getNextVariableName: extern fn (*usize, [*]u16, *align(8) Guid) usize,
+    setVariable: extern fn ([*]const u16, *align(8) const Guid, u32, usize, *c_void) usize,
+    getNextHighMonotonicCount: usize, // TODO
+    resetSystem: extern fn (ResetType, usize, usize, ?*const c_void) noreturn,
+    updateCapsule: usize, // TODO
+    queryCapsuleCapabilities: usize, // TODO
+    queryVariableInfo: usize, // TODO
+
+    pub const signature: u64 = 0x56524553544e5552;
+};
+
+/// UEFI Specification, Version 2.8, 8.5.1
+pub const ResetType = extern enum(u32) {
+    ResetCold,
+    ResetWarm,
+    ResetShutdown,
+    ResetPlatformSpecific,
+};
+
+/// UEFI Specification, Version 2.8, 3.3
+pub const global_variable align(8) = Guid{
+    .time_low = 0x8be4df61,
+    .time_mid = 0x93ca,
+    .time_high_and_version = 0x11d2,
+    .clock_seq_high_and_reserved = 0xaa,
+    .clock_seq_low = 0x0d,
+    .node = [_]u8{ 0x00, 0xe0, 0x98, 0x03, 0x2b, 0x8c },
+};