43 lines
1003 B
C
43 lines
1003 B
C
#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;
|
|
}
|