/*
    Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>

    This file is part of Aedrix.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef ATAGS_H
#define ATAGS_H

#include <types.h>

#define ATAG_NONE	0x00000000
#define ATAG_CORE	0x54410001
#define ATAG_MEM	0x54410002
#define ATAG_VIDEOTEXT	0x54410003
#define ATAG_RAMDISK	0x54410004
#define ATAG_INITRD2	0x54420005
#define ATAG_SERIAL	0x54410006
#define ATAG_REVISION	0x54410007
#define ATAG_VIDEOLFB	0x54410008
#define ATAG_CMDLINE	0x54410009

struct atag_core {
	uint32 flags;		/* bit 0 = read-only */
	uint32 pagesize;	/* systems page size (usually 4k) */
	uint32 rootdev;		/* root device number */
};

struct atag_mem {
	uint32 size;	/* size of the area */
	uint32 start;	/* physical start address */
};

struct atag {
	uint32 size; /* Size of tag in words (includes entire struct) */
	uint32 tag;
	union {
		struct atag_core	core;
		struct atag_mem		mem;
//		struct atag_videotext	videotext;
//		struct atag_ramdisk	ramdisk;
//		struct atag_initrd2	initrd2;
//		struct atag_serialnr	serialnr;
//		struct atag_revision	revision;
//		struct atag_videolfb	videolfb;
//		struct atag_cmdline	cmdline;
	} data;
};

#define atags_first_mem_region(atag) _atags_mem_region(atag, 1)
#define atags_next_mem_region(atag) _atags_mem_region(atag, 0)
int _atags_mem_region(struct atag **mem_header, int initialize);

#endif /* ATAGS_H */