1 /* 2 * Copyright (C) 2007 Michael Brown <mbrown (at) fensystems.co.uk>. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 of the 7 * License, or any later version. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 17 */ 18 19 FILE_LICENCE ( GPL2_OR_LATER ); 20 21 /** 22 * @file 23 * 24 * Executable image segments 25 * 26 */ 27 28 #include <errno.h> 29 #include <gpxe/uaccess.h> 30 #include <gpxe/memmap.h> 31 #include <gpxe/errortab.h> 32 #include <gpxe/segment.h> 33 34 /** 35 * Prepare segment for loading 36 * 37 * @v segment Segment start 38 * @v filesz Size of the "allocated bytes" portion of the segment 39 * @v memsz Size of the segment 40 * @ret rc Return status code 41 */ 42 int prep_segment ( userptr_t segment, size_t filesz, size_t memsz ) { 43 struct memory_map memmap; 44 physaddr_t start = user_to_phys ( segment, 0 ); 45 physaddr_t mid = user_to_phys ( segment, filesz ); 46 physaddr_t end = user_to_phys ( segment, memsz ); 47 unsigned int i; 48 49 DBG ( "Preparing segment [%lx,%lx,%lx)\n", start, mid, end ); 50 51 /* Sanity check */ 52 if ( filesz > memsz ) { 53 DBG ( "Insane segment [%lx,%lx,%lx)\n", start, mid, end ); 54 return -EINVAL; 55 } 56 57 /* Get a fresh memory map. This allows us to automatically 58 * avoid treading on any regions that Etherboot is currently 59 * editing out of the memory map. 60 */ 61 get_memmap ( &memmap ); 62 63 /* Look for a suitable memory region */ 64 for ( i = 0 ; i < memmap.count ; i++ ) { 65 if ( ( start >= memmap.regions[i].start ) && 66 ( end <= memmap.regions[i].end ) ) { 67 /* Found valid region: zero bss and return */ 68 memset_user ( segment, filesz, 0, ( memsz - filesz ) ); 69 return 0; 70 } 71 } 72 73 /* No suitable memory region found */ 74 DBG ( "Segment [%lx,%lx,%lx) does not fit into available memory\n", 75 start, mid, end ); 76 return -ERANGE; 77 } 78 79 /** 80 * Segment-specific error messages 81 * 82 * This error happens sufficiently often to merit a user-friendly 83 * description. 84 */ 85 struct errortab segment_errors[] __errortab = { 86 { ERANGE, "Requested memory not available" }, 87 }; 88
