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/*
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.
*/
#include <atags.h>
extern uint32 atags_ptr;
int atag_valid(struct atag *a) {
switch (a->tag) {
case ATAG_NONE:
return a->size == 2;
case ATAG_CORE:
return a->size == 2 || a->size == 5;
case ATAG_MEM:
case ATAG_INITRD2:
case ATAG_SERIAL:
return a->size == 4;
case ATAG_VIDEOTEXT:
case ATAG_RAMDISK:
return a->size == 5;
case ATAG_REVISION:
return a->size == 3;
case ATAG_VIDEOLFB:
return a->size == 8;
case ATAG_CMDLINE:
return a->size >= 3;
default:
return 0;
}
}
int _atags_mem_region(struct atag **mem_header, int initialize) {
if (initialize)
*mem_header = (struct atag *)atags_ptr;
else
*mem_header = (struct atag *)((uint32 *)*mem_header + (*mem_header)->size);
while (atag_valid(*mem_header) && (*mem_header)->tag != ATAG_NONE && (*mem_header)->tag != ATAG_MEM) {
*mem_header = (struct atag *)((uint32 *)*mem_header + (*mem_header)->size);
}
if (!atag_valid(*mem_header) || (*mem_header)->tag == ATAG_NONE)
return -1;
return 0;
}