[build] Copy uefi headers into project

Eventually the UEFI headers should be brought in from their own project,
but for now, like the other projects under external/, these are being
copied into this repository.

Tags: boot uefi

external/uefi/runtime_services.h

@@ -0,0 +1,52 @@
+#pragma once
+#ifndef _uefi_runtime_services_h_
+#define _uefi_runtime_services_h_
+
+// This Source Code Form is part of the j6-uefi-headers project and is subject
+// to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was
+// not distributed with this file, You can obtain one at
+// http://mozilla.org/MPL/2.0/.
+
+#include <stdint.h>
+#include <uefi/tables.h>
+
+namespace uefi {
+namespace rs_impl {
+	using convert_pointer = uefi::status (*)(uint64_t, void **);
+	using set_virtual_address_map = uefi::status (*)(size_t, size_t, uint32_t, memory_descriptor *);
+}
+
+struct runtime_services {
+	static constexpr uint64_t signature = 0x56524553544e5552ull;
+
+	table_header header;
+
+	// Time Services
+	void *get_time;
+	void *set_time;
+	void *get_wakeup_time;
+	void *set_wakeup_time;
+
+	// Virtual Memory Services
+	rs_impl::set_virtual_address_map set_virtual_address_map;
+	rs_impl::convert_pointer convert_pointer;
+
+	// Variable Services
+	void *get_variable;
+	void *get_next_variable_name;
+	void *set_variable;
+
+	// Miscellaneous Services
+	void *get_next_high_monotonic_count;
+	void *reset_system;
+
+	// UEFI 2.0 Capsule Services
+	void *update_capsule;
+	void *query_capsule_capabilities;
+
+	// Miscellaneous UEFI 2.0 Service
+	void *query_variable_info;
+};
+
+} // namespace uefi
+#endif