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