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/*
* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <errno.h>
#include <ipxe/efi/efi.h>
#include <ipxe/image.h>
#include <ipxe/init.h>
#include <ipxe/features.h>
FEATURE ( FEATURE_IMAGE, "EFI", DHCP_EB_FEATURE_EFI, 1 );
struct image_type efi_image_type __image_type ( PROBE_NORMAL );
/** Event used to signal shutdown */
static EFI_EVENT efi_shutdown_event;
/**
* Shut down in preparation for booting an OS.
*
* This hook gets called at ExitBootServices time in order to make sure that
* the network cards are properly shut down before the OS takes over.
*/
static EFIAPI void efi_shutdown_hook ( EFI_EVENT event __unused,
void *context __unused ) {
shutdown_boot();
}
/**
* Execute EFI image
*
* @v image EFI image
* @ret rc Return status code
*/
static int efi_image_exec ( struct image *image ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_HANDLE handle;
UINTN exit_data_size;
CHAR16 *exit_data;
EFI_STATUS efirc;
int rc;
/* Attempt loading image */
if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, NULL,
user_to_virt ( image->data, 0 ),
image->len, &handle ) ) != 0 ) {
/* Not an EFI image */
DBGC ( image, "EFIIMAGE %p could not load: %s\n",
image, efi_strerror ( efirc ) );
return -ENOEXEC;
}
/* Be sure to shut down the NIC at ExitBootServices time, or else
* DMA from the card can corrupt the OS.
*/
efirc = bs->CreateEvent ( EVT_SIGNAL_EXIT_BOOT_SERVICES,
TPL_CALLBACK, efi_shutdown_hook,
NULL, &efi_shutdown_event );
if ( efirc ) {
rc = EFIRC_TO_RC ( efirc );
goto done;
}
/* Start the image */
if ( ( efirc = bs->StartImage ( handle, &exit_data_size,
&exit_data ) ) != 0 ) {
DBGC ( image, "EFIIMAGE %p returned with status %s\n",
image, efi_strerror ( efirc ) );
}
rc = EFIRC_TO_RC ( efirc );
/* Remove the shutdown hook */
bs->CloseEvent ( efi_shutdown_event );
done:
/* Unload the image. We can't leave it loaded, because we
* have no "unload" operation.
*/
bs->UnloadImage ( handle );
return rc;
}
/**
* Load EFI image into memory
*
* @v image EFI file
* @ret rc Return status code
*/
static int efi_image_load ( struct image *image ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_HANDLE handle;
EFI_STATUS efirc;
/* Attempt loading image */
if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, NULL,
user_to_virt ( image->data, 0 ),
image->len, &handle ) ) != 0 ) {
/* Not an EFI image */
DBGC ( image, "EFIIMAGE %p could not load: %s\n",
image, efi_strerror ( efirc ) );
return -ENOEXEC;
}
/* This is an EFI image */
if ( ! image->type )
image->type = &efi_image_type;
/* Unload the image. We can't leave it loaded, because we
* have no "unload" operation.
*/
bs->UnloadImage ( handle );
return 0;
}
/** EFI image type */
struct image_type efi_image_type __image_type ( PROBE_NORMAL ) = {
.name = "EFI",
.load = efi_image_load,
.exec = efi_image_exec,
};
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