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