blob: 8201d6a6d341f6d2497a524b25e3bc95fcf9648b (
plain) (
blame)
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
|
/* Helper functions for manipulating memory protection keys, for powerpc64.
Copyright (C) 2017-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _ARCH_PKEY_H
#define _ARCH_PKEY_H
/* Read and write access bits in the AMR register. Needs to be
translated from and to PKEY_DISABLE_* flags. */
#define PKEY_AMR_READ 1UL
#define PKEY_AMR_WRITE 2UL
/* Return the value of the AMR register. */
static inline unsigned long int
pkey_read (void)
{
unsigned long int result;
__asm__ volatile ("mfspr %0, 13" : "=r" (result));
return result;
}
/* Overwrite the AMR register with VALUE. */
static inline void
pkey_write (unsigned long int value)
{
__asm__ volatile ("isync; mtspr 13, %0; isync" : : "r" (value));
}
/* Number of the largest supported key. This depends on the width of
the AMR register. */
#define PKEY_MAX (sizeof (unsigned long int) * 8 / 2 - 1)
_Static_assert (PKEY_MAX == 15 || PKEY_MAX == 31, "PKEY_MAX value");
/* Translate key number into AMR index position. */
static inline int
pkey_index (int key)
{
return 2 * (PKEY_MAX - key);
}
#endif /* _ARCH_PKEY_H */
|
