segment.c revision a734c64bff58bda2fa48c2795453e092167b0ff7
/*
* 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
*
* 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;
}