diff options
Diffstat (limited to 'gpxe/src/image/segment.c')
-rw-r--r-- | gpxe/src/image/segment.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/gpxe/src/image/segment.c b/gpxe/src/image/segment.c new file mode 100644 index 00000000..8deaef79 --- /dev/null +++ b/gpxe/src/image/segment.c @@ -0,0 +1,72 @@ +/* + * 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 + * + * Executable image segments + * + */ + +#include <errno.h> +#include <gpxe/uaccess.h> +#include <gpxe/memmap.h> +#include <gpxe/segment.h> + +/** + * 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; + + /* 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; +} |