mte_def.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/* Copyright (C) 2020 ARM Limited */
 3
 4/*
 5 * Below definitions may be found in kernel headers, However, they are
 6 * redefined here to decouple the MTE selftests compilations from them.
 7 */
 8#ifndef SEGV_MTEAERR
 9#define	SEGV_MTEAERR	8
10#endif
11#ifndef SEGV_MTESERR
12#define	SEGV_MTESERR	9
13#endif
14#ifndef PROT_MTE
15#define PROT_MTE	 0x20
16#endif
17#ifndef HWCAP2_MTE
18#define HWCAP2_MTE	(1 << 18)
19#endif
20
21#ifndef PR_MTE_TCF_SHIFT
22#define PR_MTE_TCF_SHIFT	1
23#endif
24#ifndef PR_MTE_TCF_NONE
25#define PR_MTE_TCF_NONE		(0UL << PR_MTE_TCF_SHIFT)
26#endif
27#ifndef PR_MTE_TCF_SYNC
28#define	PR_MTE_TCF_SYNC		(1UL << PR_MTE_TCF_SHIFT)
29#endif
30#ifndef PR_MTE_TCF_ASYNC
31#define PR_MTE_TCF_ASYNC	(2UL << PR_MTE_TCF_SHIFT)
32#endif
33#ifndef PR_MTE_TAG_SHIFT
34#define	PR_MTE_TAG_SHIFT	3
35#endif
36
37/* MTE Hardware feature definitions below. */
38#define MT_TAG_SHIFT		56
39#define MT_TAG_MASK		0xFUL
40#define MT_FREE_TAG		0x0UL
41#define MT_GRANULE_SIZE         16
42#define MT_TAG_COUNT		16
43#define MT_INCLUDE_TAG_MASK	0xFFFF
44#define MT_EXCLUDE_TAG_MASK	0x0
45#define MT_ATAG_SHIFT		60
46#define MT_ATAG_MASK		0xFUL
47
48#define MT_ALIGN_GRANULE	(MT_GRANULE_SIZE - 1)
49#define MT_CLEAR_TAG(x)		((x) & ~(MT_TAG_MASK << MT_TAG_SHIFT))
50#define MT_SET_TAG(x, y)	((x) | (y << MT_TAG_SHIFT))
51#define MT_FETCH_TAG(x)		((x >> MT_TAG_SHIFT) & (MT_TAG_MASK))
52#define MT_ALIGN_UP(x)		((x + MT_ALIGN_GRANULE) & ~(MT_ALIGN_GRANULE))
53
54#define MT_CLEAR_ATAG(x)	((x) & ~(MT_TAG_MASK << MT_ATAG_SHIFT))
55#define MT_SET_ATAG(x, y)	((x) | (((y) & MT_ATAG_MASK) << MT_ATAG_SHIFT))
56#define MT_FETCH_ATAG(x)	((x >> MT_ATAG_SHIFT) & (MT_ATAG_MASK))
57
58#define MT_CLEAR_TAGS(x) 	(MT_CLEAR_ATAG(MT_CLEAR_TAG(x)))
59
60#define MT_PSTATE_TCO_SHIFT	25
61#define MT_PSTATE_TCO_MASK	~(0x1 << MT_PSTATE_TCO_SHIFT)
62#define MT_PSTATE_TCO_EN	1
63#define MT_PSTATE_TCO_DIS	0
64
65#define MT_EXCLUDE_TAG(x)		(1 << (x))
66#define MT_INCLUDE_VALID_TAG(x)		(MT_INCLUDE_TAG_MASK ^ MT_EXCLUDE_TAG(x))
67#define MT_INCLUDE_VALID_TAGS(x)	(MT_INCLUDE_TAG_MASK ^ (x))
68#define MTE_ALLOW_NON_ZERO_TAG		MT_INCLUDE_VALID_TAG(0)