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std/os/uefi: Add util function for opening protocols

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fifty-six 2022-01-16 03:04:37 -05:00
parent c727bd1bb6
commit 03347114c3
1 changed files with 21 additions and 0 deletions
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21
lib/std/os/uefi/tables/boot_services.zig
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@ -154,6 +154,27 @@ pub const BootServices = extern struct {
/// Creates an event in a group.
createEventEx: fn (type: u32, notify_tpl: usize, notify_func: EfiEventNotify, notify_ctx: *const anyopaque, event_group: *align(8) const Guid, event: *Event) callconv(.C) Status,
/// Opens a protocol with a structure as the loaded image for a UEFI application
pub fn openProtocolSt(self: *BootServices, comptime protocol: type, handle: Handle) !*protocol {
if (!@hasDecl(protocol, "guid"))
@compileError("Protocol is missing guid!");
var ptr: ?*protocol = undefined;
try self.openProtocol(
handle,
&protocol.guid,
@ptrCast(*?*anyopaque, &ptr),
// Invoking handle (loaded image)
uefi.handle,
// Control handle (null as not a driver)
null,
uefi.tables.OpenProtocolAttributes{ .by_handle_protocol = true },
).err();
return ptr.?;
}
pub const signature: u64 = 0x56524553544f4f42;
pub const event_timer: u32 = 0x80000000;