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- /*
- * 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
- *
- * 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>
-
- /** PXE load address segment */
- #define PXE_LOAD_SEGMENT 0
-
- /** PXE load address offset */
- #define PXE_LOAD_OFFSET 0x7c00
-
- 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 __unused ) {
- struct net_device *netdev;
- int discard_b, discard_c;
- uint16_t rc;
-
- /* Ensure that PXE stack is ready to use */
- pxe_init_structures();
- pxe_hook_int1a();
-
- /* Arbitrarily pick the first open network device to use for PXE */
- for_each_netdev ( netdev ) {
- pxe_netdev = netdev;
- break;
- }
-
- /* Far call to PXE NBP */
- __asm__ __volatile__ ( REAL_CODE ( "pushw %%cx\n\t"
- "pushw %%ax\n\t"
- "movw %%cx, %%es\n\t"
- "lcall $0, $0x7c00\n\t"
- "addw $4, %%sp\n\t" )
- : "=a" ( rc ), "=b" ( discard_b ),
- "=c" ( discard_c )
- : "a" ( & __from_text16 ( ppxe ) ),
- "b" ( & __from_text16 ( pxenv ) ),
- "c" ( rm_cs )
- : "edx", "esi", "edi", "ebp", "memory" );
-
- 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;
-
- /* 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 ) {
- DBG ( "PXE image could not prepare segment: %s\n",
- 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,
- };
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