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59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
#ifndef _MEMMAP_H
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#define _MEMMAP_H
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/*
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* Copyright (C) 2021 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* @file
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*
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* Memory map
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*
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*/
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#include <stdint.h>
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/** Magic value for INT 15,e820 calls */
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#define E820_SMAP 0x534d4150
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/** An INT 15,e820 memory map entry */
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struct e820_entry {
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/** Start of region */
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uint64_t start;
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/** Length of region */
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uint64_t len;
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/** Type of region */
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uint32_t type;
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/** Extended attributes (optional) */
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uint32_t attrs;
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} __attribute__ (( packed ));
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/** Normal RAM */
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#define E820_TYPE_RAM 1
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/** Region is enabled (if extended attributes are present) */
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#define E820_ATTR_ENABLED 0x00000001UL
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/** Region is non-volatile memory (if extended attributes are present) */
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#define E820_ATTR_NONVOLATILE 0x00000002UL
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extern struct e820_entry * memmap_next ( struct e820_entry *prev );
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#endif /* _MEMMAP_H */
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