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/*
23 * This bit indicates that the entry is present i.e. pmd_page()
24 * still points to a valid huge page in memory even if the pmd
25 * has been invalidated.
26 */
27#define PMD_PRESENT_INVALID	(_AT(pteval_t, 1) << 59) /* only when !PMD_SECT_VALID */
28
29#ifndef __ASSEMBLY__
30
31#include <asm/cpufeature.h>
32#include <asm/pgtable-types.h>
33
34extern bool arm64_use_ng_mappings;
35
36#define _PROT_DEFAULT		(PTE_TYPE_PAGE | PTE_AF | PTE_SHARED)
37#define _PROT_SECT_DEFAULT	(PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)
38
39#define PTE_MAYBE_NG		(arm64_use_ng_mappings ? PTE_NG : 0)
40#define PMD_MAYBE_NG		(arm64_use_ng_mappings ? PMD_SECT_NG : 0)
41
42/*
43 * If we have userspace only BTI we don't want to mark kernel pages
44 * guarded even if the system does support BTI.
45 */
46#ifdef CONFIG_ARM64_BTI_KERNEL
47#define PTE_MAYBE_GP		(system_supports_bti() ? PTE_GP : 0)
48#else
49#define PTE_MAYBE_GP		0
50#endif
51
52#define PROT_DEFAULT		(_PROT_DEFAULT | PTE_MAYBE_NG)
53#define PROT_SECT_DEFAULT	(_PROT_SECT_DEFAULT | PMD_MAYBE_NG)
54
55#define PROT_DEVICE_nGnRnE	(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE))
56#define PROT_DEVICE_nGnRE	(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE))
57#define PROT_NORMAL_NC		(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_NC))
58#define PROT_NORMAL_WT		(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_WT))
59#define PROT_NORMAL		(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL))
60#define PROT_NORMAL_TAGGED	(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_TAGGED))
61
62#define PROT_SECT_DEVICE_nGnRE	(PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE))
63#define PROT_SECT_NORMAL	(PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL))
64#define PROT_SECT_NORMAL_EXEC	(PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL))
65
66#define _PAGE_DEFAULT		(_PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL))
67
68#define PAGE_KERNEL		__pgprot(PROT_NORMAL)
69#define PAGE_KERNEL_RO		__pgprot((PROT_NORMAL & ~PTE_WRITE) | PTE_RDONLY)
70#define PAGE_KERNEL_ROX		__pgprot((PROT_NORMAL & ~(PTE_WRITE | PTE_PXN)) | PTE_RDONLY)
71#define PAGE_KERNEL_EXEC	__pgprot(PROT_NORMAL & ~PTE_PXN)
72#define PAGE_KERNEL_EXEC_CONT	__pgprot((PROT_NORMAL & ~PTE_PXN) | PTE_CONT)
73
74#define PAGE_S2_MEMATTR(attr)						\
75	({								\
76		u64 __val;						\
77		if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB))		\
78			__val = PTE_S2_MEMATTR(MT_S2_FWB_ ## attr);	\
79		else							\
80			__val = PTE_S2_MEMATTR(MT_S2_ ## attr);		\
81		__val;							\
82	 })
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 */
112