com32/lib/syslinux/memmap.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2007-2009 H. Peter Anvin - All Rights Reserved
   4  *   Copyright 2009 Intel Corporation; author: H. Peter Anvin
   5  *
   6  *   Permission is hereby granted, free of charge, to any person
   7  *   obtaining a copy of this software and associated documentation
   8  *   files (the "Software"), to deal in the Software without
   9  *   restriction, including without limitation the rights to use,
  10  *   copy, modify, merge, publish, distribute, sublicense, and/or
  11  *   sell copies of the Software, and to permit persons to whom
  12  *   the Software is furnished to do so, subject to the following
  13  *   conditions:
  14  *
  15  *   The above copyright notice and this permission notice shall
  16  *   be included in all copies or substantial portions of the Software.
  17  *
  18  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  20  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  22  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  23  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  24  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25  *   OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * ----------------------------------------------------------------------- */
  28
  29 /*
  30  * memmap.c
  31  *
  32  * Create initial memory map for "shuffle and boot" operation
  33  */
  34
  35 #include <assert.h>
  36 #include <stdbool.h>
  37 #include <stdlib.h>
  38 #include <inttypes.h>
  39
  40 #include <syslinux/memscan.h>
  41 #include <syslinux/movebits.h>
  42
  43 static int syslinux_memory_map_callback(void *map, addr_t start,
  44                                         addr_t len, bool valid)
  45 {
  46     struct syslinux_memmap **mmap = map;
  47     return syslinux_add_memmap(mmap, start, len,
  48                                valid ? SMT_FREE : SMT_RESERVED);
  49 }
  50
  51 struct syslinux_memmap *syslinux_memory_map(void)
  52 {
  53     struct syslinux_memmap *mmap;
  54
  55     mmap = syslinux_init_memmap();
  56     if (!mmap)
  57         return NULL;
  58
  59     if (syslinux_scan_memory(syslinux_memory_map_callback, &mmap)) {
  60         syslinux_free_memmap(mmap);
  61         return NULL;
  62     }
  63
  64     return mmap;
  65 }