diff options
Diffstat (limited to 'contrib/syslinux-4.02/gpxe/src/arch/i386/image/pxe_image.c')
-rw-r--r-- | contrib/syslinux-4.02/gpxe/src/arch/i386/image/pxe_image.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/arch/i386/image/pxe_image.c b/contrib/syslinux-4.02/gpxe/src/arch/i386/image/pxe_image.c new file mode 100644 index 0000000..63429f8 --- /dev/null +++ b/contrib/syslinux-4.02/gpxe/src/arch/i386/image/pxe_image.c @@ -0,0 +1,117 @@ +/* + * 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 <gpxe/uaccess.h> +#include <gpxe/image.h> +#include <gpxe/segment.h> +#include <gpxe/netdevice.h> +#include <gpxe/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 gPXE. + */ + 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, +}; |