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* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
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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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* 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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* 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., 51 Franklin Street, Fifth Floor, Boston, MA
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <ipxe/efi/efi.h>
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#include <ipxe/efi/efi_snp.h>
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#include <ipxe/efi/efi_download.h>
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#include <ipxe/efi/efi_file.h>
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#include <ipxe/efi/efi_utils.h>
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#include <ipxe/efi/efi_strings.h>
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#include <ipxe/efi/efi_wrap.h>
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#include <ipxe/efi/efi_pxe.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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#include <ipxe/console.h>
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FEATURE ( FEATURE_IMAGE, "EFI", DHCP_EB_FEATURE_EFI, 1 );
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/* Disambiguate the various error causes */
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#define EINFO_EEFI_LOAD \
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__einfo_uniqify ( EINFO_EPLATFORM, 0x01, \
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"Could not load image" )
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#define EINFO_EEFI_LOAD_PROHIBITED \
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__einfo_platformify ( EINFO_EEFI_LOAD, EFI_SECURITY_VIOLATION, \
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"Image prohibited by security policy" )
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#define EEFI_LOAD_PROHIBITED \
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__einfo_error ( EINFO_EEFI_LOAD_PROHIBITED )
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#define EEFI_LOAD( efirc ) EPLATFORM ( EINFO_EEFI_LOAD, efirc, \
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EEFI_LOAD_PROHIBITED )
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#define EINFO_EEFI_START \
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__einfo_uniqify ( EINFO_EPLATFORM, 0x02, \
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"Could not start image" )
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#define EEFI_START( efirc ) EPLATFORM ( EINFO_EEFI_START, efirc )
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* Create device path for image
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* @v parent Parent device path
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* @ret path Device path, or NULL on failure
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* The caller must eventually free() the device path.
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static EFI_DEVICE_PATH_PROTOCOL *
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efi_image_path ( struct image *image, EFI_DEVICE_PATH_PROTOCOL *parent ) {
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EFI_DEVICE_PATH_PROTOCOL *path;
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FILEPATH_DEVICE_PATH *filepath;
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EFI_DEVICE_PATH_PROTOCOL *end;
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/* Calculate device path lengths */
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prefix_len = efi_devpath_len ( parent );
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name_len = strlen ( image->name );
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filepath_len = ( SIZE_OF_FILEPATH_DEVICE_PATH +
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( name_len + 1 /* NUL */ ) * sizeof ( wchar_t ) );
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len = ( prefix_len + filepath_len + sizeof ( *end ) );
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/* Allocate device path */
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path = zalloc ( len );
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/* Construct device path */
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memcpy ( path, parent, prefix_len );
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filepath = ( ( ( void * ) path ) + prefix_len );
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filepath->Header.Type = MEDIA_DEVICE_PATH;
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filepath->Header.SubType = MEDIA_FILEPATH_DP;
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filepath->Header.Length[0] = ( filepath_len & 0xff );
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filepath->Header.Length[1] = ( filepath_len >> 8 );
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efi_snprintf ( filepath->PathName, ( name_len + 1 /* NUL */ ),
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end = ( ( ( void * ) filepath ) + filepath_len );
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end->Type = END_DEVICE_PATH_TYPE;
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end->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
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end->Length[0] = sizeof ( *end );
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* Create command line for image
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* @ret cmdline Command line, or NULL on failure
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static wchar_t * efi_image_cmdline ( struct image *image ) {
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len = ( strlen ( image->name ) +
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( 1 /* " " */ + strlen ( image->cmdline ) ) : 0 ) );
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cmdline = zalloc ( ( len + 1 /* NUL */ ) * sizeof ( wchar_t ) );
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efi_snprintf ( cmdline, ( len + 1 /* NUL */ ), "%s%s%s",
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( image->cmdline ? " " : "" ),
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( image->cmdline ? image->cmdline : "" ) );
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* @ret rc Return status code
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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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struct efi_snp_device *snpdev;
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EFI_DEVICE_PATH_PROTOCOL *path;
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EFI_LOADED_IMAGE_PROTOCOL *image;
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/* Find an appropriate device handle to use */
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snpdev = last_opened_snpdev();
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DBGC ( image, "EFIIMAGE %p could not identify SNP device\n",
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/* Install file I/O protocols */
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if ( ( rc = efi_file_install ( snpdev->handle ) ) != 0 ) {
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DBGC ( image, "EFIIMAGE %p could not install file protocol: "
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"%s\n", image, strerror ( rc ) );
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goto err_file_install;
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/* Install PXE base code protocol */
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if ( ( rc = efi_pxe_install ( snpdev->handle, snpdev->netdev ) ) != 0 ){
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DBGC ( image, "EFIIMAGE %p could not install PXE protocol: "
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"%s\n", image, strerror ( rc ) );
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goto err_pxe_install;
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/* Install iPXE download protocol */
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if ( ( rc = efi_download_install ( snpdev->handle ) ) != 0 ) {
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DBGC ( image, "EFIIMAGE %p could not install iPXE download "
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"protocol: %s\n", image, strerror ( rc ) );
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goto err_download_install;
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/* Create device path for image */
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path = efi_image_path ( image, snpdev->path );
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DBGC ( image, "EFIIMAGE %p could not create device path\n",
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/* Create command line for image */
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cmdline = efi_image_cmdline ( image );
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DBGC ( image, "EFIIMAGE %p could not create command line\n",
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/* Attempt loading image */
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if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, path,
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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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rc = -EEFI_LOAD ( efirc );
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DBGC ( image, "EFIIMAGE %p could not load: %s\n",
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image, strerror ( rc ) );
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/* Get the loaded image protocol for the newly loaded image */
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efirc = bs->OpenProtocol ( handle, &efi_loaded_image_protocol_guid,
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&loaded.interface, efi_image_handle,
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NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL );
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/* Should never happen */
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rc = -EEFI ( efirc );
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goto err_open_protocol;
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/* Some EFI 1.10 implementations seem not to fill in DeviceHandle */
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if ( loaded.image->DeviceHandle == NULL ) {
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DBGC ( image, "EFIIMAGE %p filling in missing DeviceHandle\n",
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loaded.image->DeviceHandle = snpdev->handle;
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assert ( loaded.image->ParentHandle == efi_image_handle );
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assert ( loaded.image->DeviceHandle == snpdev->handle );
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assert ( loaded.image->LoadOptionsSize == 0 );
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assert ( loaded.image->LoadOptions == NULL );
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/* Set command line */
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loaded.image->LoadOptions = cmdline;
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loaded.image->LoadOptionsSize =
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( ( wcslen ( cmdline ) + 1 /* NUL */ ) * sizeof ( wchar_t ) );
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/* Release network devices for use via SNP */
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/* Wrap calls made by the loaded image (for debugging) */
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/* Reset console since image will probably use it */
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/* Start the image */
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if ( ( efirc = bs->StartImage ( handle, NULL, NULL ) ) != 0 ) {
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rc = -EEFI_START ( efirc );
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DBGC ( image, "EFIIMAGE %p could not start (or returned with "
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"error): %s\n", image, strerror ( rc ) );
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goto err_start_image;
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/* If there was no error, then the image must have been
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* started and returned successfully. It either unloaded
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* itself, or it intended to remain loaded (e.g. it was a
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* driver). We therefore do not unload successful images.
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* If there was an error, attempt to unload the image. This
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* may not work. In particular, there is no way to tell
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* whether an error returned from StartImage() was due to
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* being unable to start the image (in which case we probably
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* should call UnloadImage()), or due to the image itself
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* returning an error (in which case we probably should not
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* call UnloadImage()). We therefore ignore any failures from
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* the UnloadImage() call itself.
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bs->UnloadImage ( handle );
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efi_download_uninstall ( snpdev->handle );
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err_download_install:
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efi_pxe_uninstall ( snpdev->handle );
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efi_file_uninstall ( snpdev->handle );
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* @ret rc Return status code
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static int efi_image_probe ( struct image *image ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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static EFI_DEVICE_PATH_PROTOCOL empty_path = {
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.Type = END_DEVICE_PATH_TYPE,
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.SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE,
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.Length[0] = sizeof ( empty_path ),
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/* Attempt loading image */
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if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, &empty_path,
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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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rc = -EEFI_LOAD ( efirc );
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DBGC ( image, "EFIIMAGE %p could not load: %s\n",
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image, strerror ( rc ) );
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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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bs->UnloadImage ( handle );
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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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.probe = efi_image_probe,
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.exec = efi_image_exec,