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73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/**
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* @file
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*
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* Executable image segments
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*
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*/
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#include <errno.h>
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#include <gpxe/uaccess.h>
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#include <gpxe/memmap.h>
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#include <gpxe/segment.h>
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/**
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* Prepare segment for loading
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*
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* @v segment Segment start
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* @v filesz Size of the "allocated bytes" portion of the segment
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* @v memsz Size of the segment
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* @ret rc Return status code
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*/
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int prep_segment ( userptr_t segment, size_t filesz, size_t memsz ) {
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struct memory_map memmap;
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physaddr_t start = user_to_phys ( segment, 0 );
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physaddr_t mid = user_to_phys ( segment, filesz );
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physaddr_t end = user_to_phys ( segment, memsz );
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unsigned int i;
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/* Sanity check */
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if ( filesz > memsz ) {
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DBG ( "Insane segment [%lx,%lx,%lx)\n", start, mid, end );
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return -EINVAL;
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}
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/* Get a fresh memory map. This allows us to automatically
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* avoid treading on any regions that Etherboot is currently
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* editing out of the memory map.
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*/
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get_memmap ( &memmap );
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/* Look for a suitable memory region */
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for ( i = 0 ; i < memmap.count ; i++ ) {
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if ( ( start >= memmap.regions[i].start ) &&
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( end <= memmap.regions[i].end ) ) {
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/* Found valid region: zero bss and return */
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memset_user ( segment, filesz, 0, ( memsz - filesz ) );
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return 0;
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}
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}
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/* No suitable memory region found */
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DBG ( "Segment [%lx,%lx,%lx) does not fit into available memory\n",
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start, mid, end );
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return -ERANGE;
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}
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