118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/*
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* Copyright (C) 2007 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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/**
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* @file
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*
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* PXE image format
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*
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*/
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#include <pxe.h>
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#include <pxe_call.h>
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#include <ipxe/uaccess.h>
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#include <ipxe/image.h>
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#include <ipxe/segment.h>
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#include <ipxe/netdevice.h>
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#include <ipxe/features.h>
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FEATURE ( FEATURE_IMAGE, "PXE", DHCP_EB_FEATURE_PXE, 1 );
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struct image_type pxe_image_type __image_type ( PROBE_PXE );
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/**
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* Execute PXE image
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*
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* @v image PXE image
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* @ret rc Return status code
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*/
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static int pxe_exec ( struct image *image ) {
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struct net_device *netdev;
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int rc;
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/* Arbitrarily pick the most recently opened network device */
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if ( ( netdev = last_opened_netdev() ) == NULL ) {
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DBGC ( image, "IMAGE %p could not locate PXE net device\n",
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image );
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return -ENODEV;
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}
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/* Activate PXE */
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pxe_activate ( netdev );
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/* Start PXE NBP */
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rc = pxe_start_nbp();
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/* Deactivate PXE */
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pxe_deactivate();
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return rc;
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}
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/**
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* Load PXE image into memory
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*
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* @v image PXE file
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* @ret rc Return status code
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*/
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int pxe_load ( struct image *image ) {
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userptr_t buffer = real_to_user ( 0, 0x7c00 );
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size_t filesz = image->len;
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size_t memsz = image->len;
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int rc;
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/* Images too large to fit in base memory cannot be PXE
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* images. We include this check to help prevent unrecognised
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* images from being marked as PXE images, since PXE images
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* have no signature we can check against.
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*/
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if ( filesz > ( 0xa0000 - 0x7c00 ) )
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return -ENOEXEC;
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/* Rejecting zero-length images is also useful, since these
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* end up looking to the user like bugs in iPXE.
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*/
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if ( ! filesz )
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return -ENOEXEC;
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/* There are no signature checks for PXE; we will accept anything */
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if ( ! image->type )
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image->type = &pxe_image_type;
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/* Verify and prepare segment */
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if ( ( rc = prep_segment ( buffer, filesz, memsz ) ) != 0 ) {
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DBGC ( image, "IMAGE %p could not prepare segment: %s\n",
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image, strerror ( rc ) );
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return rc;
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}
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/* Copy image to segment */
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memcpy_user ( buffer, 0, image->data, 0, filesz );
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return 0;
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}
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/** PXE image type */
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struct image_type pxe_image_type __image_type ( PROBE_PXE ) = {
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.name = "PXE",
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.load = pxe_load,
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.exec = pxe_exec,
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};
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