/**
 * PROJECT:         ExectOS
 * COPYRIGHT:       See COPYING.md in the top level directory
 * FILE:            xtldr/efiutils.c
 * DESCRIPTION:     EFI related routines for XT Boot Loader
 * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
 */

#include <xtldr.h>


/**
 * Exits EFI boot services.
 *
 * @param MapKey
 *        Identifies the current memory map of the system.
 *
 * @return This routine returns status code.
 *
 * @since XT 1.0
 */
XTCDECL
EFI_STATUS
BlExitBootServices(IN UINT_PTR MapKey)
{
    EFI_STATUS Status;

    /* Attempt to exit boot services */
    Status = EfiSystemTable->BootServices->ExitBootServices(BlpStatus.ImageHandle, MapKey);
    if(Status != STATUS_EFI_SUCCESS)
    {
        /* Retry as UEFI spec says to do it twice */
        Status = EfiSystemTable->BootServices->ExitBootServices(BlpStatus.ImageHandle, MapKey);
    }

    /* Make sure boot services were successfully exited */
    if(Status == STATUS_EFI_SUCCESS)
    {
        /* Mark EFI Boot Services as no longer available */
        BlpStatus.BootServices = FALSE;
    }

    /* Return EFI status code */
    return Status;
}

/**
 * Puts the system to sleep for the specified number of milliseconds.
 *
 * @param Milliseconds
 *        Supplies the number of milliseconds to sleep.
 *
 * @return This routine does not return any value.
 *
 * @since XT 1.0
 */
XTCDECL
VOID
BlSleepExecution(IN ULONG_PTR Milliseconds)
{
    EfiSystemTable->BootServices->Stall(Milliseconds * 1000);
}

/**
 * Initializes EFI Boot Loader (XTLDR).
 *
 * @return This routine does not return any value.
 *
 * @since XT 1.0
 */
XTCDECL
VOID
BlpInitializeEfiBootLoader()
{
    /* Set current XTLDR status */
    BlpStatus.BootServices = TRUE;
    BlpStatus.ImageHandle = EfiImageHandle;
    BlpStatus.SystemTable = EfiSystemTable;

    /* Initialize console */
    BlpConsoleInitialize();
}