Syncboot/main.c

#include <efi.h>
#include <efilib.h>

EFI_SYSTEM_TABLE		*gST;
EFI_BOOT_SERVICES		*gBS;
EFI_RUNTIME_SERVICES	*gRT;

// Application entrypoint (must be set to 'efi_main' for gnu-efi crt0 compatibility)
EFI_STATUS efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
{
	UINTN Event;
	EFI_STATUS Status;
	EFI_TIME* Time;
	gST = SystemTable;
	gBS = gST->BootServices;
	gRT = gST->RuntimeServices;

#if defined(_GNU_EFI)
	InitializeLib(ImageHandle, SystemTable);
#endif

	/*
	 * In addition to the standard %-based flags, Print() supports the following:
	 *   %N       Set output attribute to normal
	 *   %H       Set output attribute to highlight
	 *   %E       Set output attribute to error
	 *   %B       Set output attribute to blue color
	 *   %V       Set output attribute to green color
	 *   %r       Human readable version of a status code
	 */
	Print(L"\n%H*** Sync Bootloading ***%N\n\n");

	Status = gST->ConOut->OutputString(gST->ConOut, L"Hello World\n\r");
	if (EFI_ERROR(Status))
		return Status;

	Status = gBS->AllocatePool(EfiBootServicesData,
		sizeof(EFI_TIME),
		(VOID**)&Time);

	if (EFI_ERROR(Status))
		return Status;

	Status = gRT->GetTime(Time, NULL);
	if (EFI_ERROR(Status))
		return Status;

	Print(L"%EPress any key to exit.%N\n");
	SystemTable->ConIn->Reset(SystemTable->ConIn, FALSE);
	SystemTable->BootServices->WaitForEvent(1, &SystemTable->ConIn->WaitForKey, &Event);
#if defined(_DEBUG)
	// If running in debug mode, use the EFI shut down call to close QEMU
	SystemTable->RuntimeServices->ResetSystem(EfiResetShutdown, EFI_SUCCESS, 0, NULL);
#endif

	return Status;
}