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