iPXE
efi_autoboot.c
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00001 /*
00002  * Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
00003  *
00004  * This program is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU General Public License as
00006  * published by the Free Software Foundation; either version 2 of the
00007  * License, or any later version.
00008  *
00009  * This program is distributed in the hope that it will be useful, but
00010  * WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU General Public License
00015  * along with this program; if not, write to the Free Software
00016  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00017  * 02110-1301, USA.
00018  *
00019  * You can also choose to distribute this program under the terms of
00020  * the Unmodified Binary Distribution Licence (as given in the file
00021  * COPYING.UBDL), provided that you have satisfied its requirements.
00022  */
00023 
00024 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
00025 
00026 #include <ipxe/efi/efi.h>
00027 #include <ipxe/efi/efi_autoboot.h>
00028 #include <ipxe/efi/Protocol/SimpleNetwork.h>
00029 #include <usr/autoboot.h>
00030 
00031 /** @file
00032  *
00033  * EFI autoboot device
00034  *
00035  */
00036 
00037 /**
00038  * Identify autoboot device
00039  *
00040  */
00041 void efi_set_autoboot ( void ) {
00042         EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
00043         union {
00044                 EFI_SIMPLE_NETWORK_PROTOCOL *snp;
00045                 void *interface;
00046         } snp;
00047         EFI_SIMPLE_NETWORK_MODE *mode;
00048         EFI_STATUS efirc;
00049 
00050         /* Look for an SNP instance on the image's device handle */
00051         if ( ( efirc = bs->OpenProtocol ( efi_loaded_image->DeviceHandle,
00052                                           &efi_simple_network_protocol_guid,
00053                                           &snp.interface, efi_image_handle,
00054                                           NULL,
00055                                           EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
00056                 DBGC ( efi_loaded_image, "EFI found no autoboot device\n" );
00057                 return;
00058         }
00059 
00060         /* Record autoboot device */
00061         mode = snp.snp->Mode;
00062         set_autoboot_ll_addr ( &mode->CurrentAddress, mode->HwAddressSize );
00063         DBGC ( efi_loaded_image, "EFI found autoboot link-layer address:\n" );
00064         DBGC_HDA ( efi_loaded_image, 0, &mode->CurrentAddress,
00065                    mode->HwAddressSize );
00066 
00067         /* Close protocol */
00068         bs->CloseProtocol ( efi_loaded_image->DeviceHandle,
00069                             &efi_simple_network_protocol_guid,
00070                             efi_image_handle, NULL );
00071 }