[libc] implement uefi exit()

Author: RossComputerGuy

libc/include/llvm-libc-types/CMakeLists.txt

@@ -245,6 +245,7 @@ add_header(EFI_BOOT_SERVICES
     .EFI_MEMORY_TYPE
     .EFI_OPEN_PROTOCOL_INFORMATION_ENTRY
     .EFI_PHYSICAL_ADDRESS
+    .EFI_STATUS
     .EFI_TABLE_HEADER
     .EFI_TIMER_DELAY
     .EFI_TPL

libc/include/llvm-libc-types/EFI_BOOT_SERVICES.h

@@ -20,6 +20,7 @@
 #include "EFI_MEMORY_TYPE.h"
 #include "EFI_OPEN_PROTOCOL_INFORMATION_ENTRY.h"
 #include "EFI_PHYSICAL_ADDRESS.h"
+#include "EFI_STATUS.h"
 #include "EFI_TABLE_HEADER.h"
 #include "EFI_TIMER_DELAY.h"
 #include "EFI_TPL.h"

libc/src/__support/OSUtil/uefi/CMakeLists.txt

@@ -6,6 +6,7 @@ add_object_library(
   HDRS
     io.h
   DEPENDS
+    libc.include.uefi
     libc.src.__support.common
     libc.src.__support.CPP.string_view
 )

libc/src/__support/OSUtil/uefi/exit.cpp

@@ -7,16 +7,17 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/OSUtil/exit.h"
+#include "include/llvm-libc-macros/stdlib-macros.h"
 #include "src/__support/macros/config.h"
+#include <Uefi.h>
 
 namespace LIBC_NAMESPACE_DECL {
 namespace internal {
 
 [[noreturn]] void exit(int status) {
-  (void)status;
-  // TODO: call boot services to exit
-  while (true) {
-  }
+  efi_system_table->BootServices->Exit(efi_image_handle, status, 0, NULL);
+  while (true)
+    ;
 }
 
 } // namespace internal