blob: ef1d5790a3ac5005ea023fa1b23fac44e9a8045c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
|
// See LICENSE for license details.
#include "cfg.h"
#include "mmu.h"
#include "decode.h"
mem_cfg_t::mem_cfg_t(reg_t base, reg_t size) : base(base), size(size)
{
assert(mem_cfg_t::check_if_supported(base, size));
}
bool mem_cfg_t::check_if_supported(reg_t base, reg_t size)
{
// The truth of these conditions should be ensured by whatever is creating
// the regions in the first place, but we have them here to make sure that
// we can't end up describing memory regions that don't make sense. They
// ask that the page size is a multiple of the minimum page size, that the
// page is aligned to the minimum page size, that the page is non-empty and
// that the top address is still representable in a reg_t.
return (size % PGSIZE == 0) &&
(base % PGSIZE == 0) &&
(base + size > base);
}
|