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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2016 ARM Ltd.
4 */
5#ifndef __ASM_PGTABLE_PROT_H
6#define __ASM_PGTABLE_PROT_H
7
8#include <asm/memory.h>
9#include <asm/pgtable-hwdef.h>
10
11#include <linux/const.h>
12
13/*
14 * Software defined PTE bits definition.
15 */
16#define PTE_WRITE (PTE_DBM) /* same as DBM (51) */
17#define PTE_DIRTY (_AT(pteval_t, 1) << 55)
18#define PTE_SPECIAL (_AT(pteval_t, 1) << 56)
19#define PTE_DEVMAP (_AT(pteval_t, 1) << 57)
20#define PTE_PROT_NONE (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */
21
22#ifndef __ASSEMBLY__
23
24#include <asm/pgtable-types.h>
25
26extern bool arm64_use_ng_mappings;
27
28#define _PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED)
29#define _PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)
30
31#define PTE_MAYBE_NG (arm64_use_ng_mappings ? PTE_NG : 0)
32#define PMD_MAYBE_NG (arm64_use_ng_mappings ? PMD_SECT_NG : 0)
33
34#define PROT_DEFAULT (_PROT_DEFAULT | PTE_MAYBE_NG)
35#define PROT_SECT_DEFAULT (_PROT_SECT_DEFAULT | PMD_MAYBE_NG)
36
37#define PROT_DEVICE_nGnRnE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE))
38#define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE))
39#define PROT_NORMAL_NC (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_NC))
40#define PROT_NORMAL_WT (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_WT))
41#define PROT_NORMAL (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL))
42
43#define PROT_SECT_DEVICE_nGnRE (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE))
44#define PROT_SECT_NORMAL (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL))
45#define PROT_SECT_NORMAL_EXEC (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL))
46
47#define _PAGE_DEFAULT (_PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL))
48#define _HYP_PAGE_DEFAULT _PAGE_DEFAULT
49
50#define PAGE_KERNEL __pgprot(PROT_NORMAL)
51#define PAGE_KERNEL_RO __pgprot((PROT_NORMAL & ~PTE_WRITE) | PTE_RDONLY)
52#define PAGE_KERNEL_ROX __pgprot((PROT_NORMAL & ~(PTE_WRITE | PTE_PXN)) | PTE_RDONLY)
53#define PAGE_KERNEL_EXEC __pgprot(PROT_NORMAL & ~PTE_PXN)
54#define PAGE_KERNEL_EXEC_CONT __pgprot((PROT_NORMAL & ~PTE_PXN) | PTE_CONT)
55
56#define PAGE_HYP __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_HYP_XN)
57#define PAGE_HYP_EXEC __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY)
58#define PAGE_HYP_RO __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY | PTE_HYP_XN)
59#define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP)
60
61#define PAGE_S2_MEMATTR(attr) \
62 ({ \
63 u64 __val; \
64 if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) \
65 __val = PTE_S2_MEMATTR(MT_S2_FWB_ ## attr); \
66 else \
67 __val = PTE_S2_MEMATTR(MT_S2_ ## attr); \
68 __val; \
69 })
70
71#define PAGE_S2_XN \
72 ({ \
73 u64 __val; \
74 if (cpus_have_const_cap(ARM64_HAS_CACHE_DIC)) \
75 __val = 0; \
76 else \
77 __val = PTE_S2_XN; \
78 __val; \
79 })
80
81#define PAGE_S2 __pgprot(_PROT_DEFAULT | PAGE_S2_MEMATTR(NORMAL) | PTE_S2_RDONLY | PAGE_S2_XN)
82#define PAGE_S2_DEVICE __pgprot(_PROT_DEFAULT | PAGE_S2_MEMATTR(DEVICE_nGnRE) | PTE_S2_RDONLY | PTE_S2_XN)
83
84#define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN)
85/* shared+writable pages are clean by default, hence PTE_RDONLY|PTE_WRITE */
86#define PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)
87#define PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_WRITE)
88#define PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN)
89#define PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN)
90
91#define __P000 PAGE_NONE
92#define __P001 PAGE_READONLY
93#define __P010 PAGE_READONLY
94#define __P011 PAGE_READONLY
95#define __P100 PAGE_READONLY_EXEC
96#define __P101 PAGE_READONLY_EXEC
97#define __P110 PAGE_READONLY_EXEC
98#define __P111 PAGE_READONLY_EXEC
99
100#define __S000 PAGE_NONE
101#define __S001 PAGE_READONLY
102#define __S010 PAGE_SHARED
103#define __S011 PAGE_SHARED
104#define __S100 PAGE_READONLY_EXEC
105#define __S101 PAGE_READONLY_EXEC
106#define __S110 PAGE_SHARED_EXEC
107#define __S111 PAGE_SHARED_EXEC
108
109#endif /* __ASSEMBLY__ */
110
111#endif /* __ASM_PGTABLE_PROT_H */