wimboot/wimboot-2.7.3/src/memmap.h

   1 #ifndef _MEMMAP_H
   2 #define _MEMMAP_H
   3
   4 /*
   5  * Copyright (C) 2021 Michael Brown <mbrown@fensystems.co.uk>.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  */
  22
  23 /**
  24  * @file
  25  *
  26  * Memory map
  27  *
  28  */
  29
  30 #include <stdint.h>
  31
  32 /** Magic value for INT 15,e820 calls */
  33 #define E820_SMAP 0x534d4150
  34
  35 /** An INT 15,e820 memory map entry */
  36 struct e820_entry {
  37         /** Start of region */
  38         uint64_t start;
  39         /** Length of region */
  40         uint64_t len;
  41         /** Type of region */
  42         uint32_t type;
  43         /** Extended attributes (optional) */
  44         uint32_t attrs;
  45 } __attribute__ (( packed ));
  46
  47 /** Normal RAM */
  48 #define E820_TYPE_RAM 1
  49
  50 /** Region is enabled (if extended attributes are present) */
  51 #define E820_ATTR_ENABLED 0x00000001UL
  52
  53 /** Region is non-volatile memory (if extended attributes are present) */
  54 #define E820_ATTR_NONVOLATILE 0x00000002UL
  55
  56 extern struct e820_entry * memmap_next ( struct e820_entry *prev );
  57
  58 #endif /* _MEMMAP_H */