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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., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- *
- * You can also choose to distribute this program under the terms of
- * the Unmodified Binary Distribution Licence (as given in the file
- * COPYING.UBDL), provided that you have satisfied its requirements.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-
- /**
- * @file
- *
- * Executable image segments
- *
- */
-
- #include <errno.h>
- #include <ipxe/uaccess.h>
- #include <ipxe/io.h>
- #include <ipxe/errortab.h>
- #include <ipxe/segment.h>
-
- /**
- * Segment-specific error messages
- *
- * This error happens sufficiently often to merit a user-friendly
- * description.
- */
- #define ERANGE_SEGMENT __einfo_error ( EINFO_ERANGE_SEGMENT )
- #define EINFO_ERANGE_SEGMENT \
- __einfo_uniqify ( EINFO_ERANGE, 0x01, "Requested memory not available" )
- struct errortab segment_errors[] __errortab = {
- __einfo_errortab ( EINFO_ERANGE_SEGMENT ),
- };
-
- /**
- * Prepare segment for loading
- *
- * @v segment Segment start
- * @v filesz Size of the "allocated bytes" portion of the segment
- * @v memsz Size of the segment
- * @ret rc Return status code
- */
- int prep_segment ( userptr_t segment, size_t filesz, size_t memsz ) {
- struct memory_map memmap;
- physaddr_t start = user_to_phys ( segment, 0 );
- physaddr_t mid = user_to_phys ( segment, filesz );
- physaddr_t end = user_to_phys ( segment, memsz );
- unsigned int i;
-
- DBG ( "Preparing segment [%lx,%lx,%lx)\n", start, mid, end );
-
- /* Sanity check */
- if ( filesz > memsz ) {
- DBG ( "Insane segment [%lx,%lx,%lx)\n", start, mid, end );
- return -EINVAL;
- }
-
- /* Get a fresh memory map. This allows us to automatically
- * avoid treading on any regions that Etherboot is currently
- * editing out of the memory map.
- */
- get_memmap ( &memmap );
-
- /* Look for a suitable memory region */
- for ( i = 0 ; i < memmap.count ; i++ ) {
- if ( ( start >= memmap.regions[i].start ) &&
- ( end <= memmap.regions[i].end ) ) {
- /* Found valid region: zero bss and return */
- memset_user ( segment, filesz, 0, ( memsz - filesz ) );
- return 0;
- }
- }
-
- /* No suitable memory region found */
- DBG ( "Segment [%lx,%lx,%lx) does not fit into available memory\n",
- start, mid, end );
- return -ERANGE_SEGMENT;
- }
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