1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <utils.h>
/*
* All the regions defined in mem_region_t must have the following properties
*
* - Any contiguous regions must be merged into a single entry.
* - The number of bytes of each region must be greater than zero.
* - The calculation of the highest address within the region (base + nbytes-1)
* doesn't produce an overflow.
*
* These conditions must be fulfilled by the caller and they aren't checked
* at runtime.
*/
/*
* zero_normalmem all the regions defined in tbl.
* It assumes that MMU is enabled and the memory is Normal memory.
* tbl must be a valid pointer to a memory mem_region_t array,
* nregions is the size of the array.
*/
void clear_mem_regions(mem_region_t *tbl, size_t nregions)
{
size_t i;
assert(tbl);
assert(nregions > 0);
for (i = 0; i < nregions; i++) {
assert(tbl->nbytes > 0);
assert(!check_uptr_overflow(tbl->base, tbl->nbytes-1));
zero_normalmem((void *) (tbl->base), tbl->nbytes);
tbl++;
}
}
/*
* This function checks that a region (addr + nbytes-1) of memory is totally
* covered by one of the regions defined in tbl.
* tbl must be a valid pointer to a memory mem_region_t array, nregions
* is the size of the array and the region described by addr and nbytes must
* not generate an overflow.
* Returns:
* -1 means that the region is not covered by any of the regions
* described in tbl.
* 0 the region (addr + nbytes-1) is covered by one of the regions described
* in tbl
*/
int mem_region_in_array_chk(mem_region_t *tbl, size_t nregions,
uintptr_t addr, size_t nbytes)
{
uintptr_t region_start, region_end, start, end;
size_t i;
assert(tbl);
assert(nbytes > 0);
assert(!check_uptr_overflow(addr, nbytes-1));
region_start = addr;
region_end = addr + (nbytes - 1);
for (i = 0; i < nregions; i++) {
assert(tbl->nbytes > 0);
assert(!check_uptr_overflow(tbl->base, tbl->nbytes-1));
start = tbl->base;
end = start + (tbl->nbytes - 1);
if (region_start >= start && region_end <= end)
return 0;
tbl++;
}
return -1;
}
|
