81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
|
|
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>
|
|
#include <mmu.h>
|
|
|
|
extern arch_uint_ptr 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;
|
|
}
|
|
|
|
int detect_memory() {
|
|
struct atag *atags;
|
|
char *lower, *upper;
|
|
|
|
if (atags_first_mem_region(&atags)) {
|
|
return -1;
|
|
}
|
|
|
|
do {
|
|
lower = (char *)atags->data.mem.start;
|
|
upper = lower + atags->data.mem.size - 1;
|
|
declare_memory_region(lower, upper);
|
|
} while (!atags_next_mem_region(&atags));
|
|
|
|
return 0;
|
|
}
|