/* * Copyright (C) 2007 Michael Brown . * * 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 #include #include #include #include /** * 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; }