1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2016 ARM Ltd.
5 #ifndef __ASM_PGTABLE_PROT_H
6 #define __ASM_PGTABLE_PROT_H
8 #include <asm/memory.h>
9 #include <asm/pgtable-hwdef.h>
11 #include <linux/const.h>
14 * Software defined PTE bits definition.
16 #define PTE_WRITE (PTE_DBM) /* same as DBM (51) */
17 #define PTE_SWP_EXCLUSIVE (_AT(pteval_t, 1) << 2) /* only for swp ptes */
18 #define PTE_DIRTY (_AT(pteval_t, 1) << 55)
19 #define PTE_SPECIAL (_AT(pteval_t, 1) << 56)
20 #define PTE_DEVMAP (_AT(pteval_t, 1) << 57)
21 #define PTE_PROT_NONE (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */
24 * This bit indicates that the entry is present i.e. pmd_page()
25 * still points to a valid huge page in memory even if the pmd
26 * has been invalidated.
28 #define PMD_PRESENT_INVALID (_AT(pteval_t, 1) << 59) /* only when !PMD_SECT_VALID */
30 #define _PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED)
31 #define _PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)
33 #define PROT_DEFAULT (_PROT_DEFAULT | PTE_MAYBE_NG)
34 #define PROT_SECT_DEFAULT (_PROT_SECT_DEFAULT | PMD_MAYBE_NG)
36 #define PROT_DEVICE_nGnRnE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE))
37 #define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE))
38 #define PROT_NORMAL_NC (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_NC))
39 #define PROT_NORMAL (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL))
40 #define PROT_NORMAL_TAGGED (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_TAGGED))
42 #define PROT_SECT_DEVICE_nGnRE (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE))
43 #define PROT_SECT_NORMAL (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PTE_WRITE | PMD_ATTRINDX(MT_NORMAL))
44 #define PROT_SECT_NORMAL_EXEC (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL))
46 #define _PAGE_DEFAULT (_PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL))
48 #define _PAGE_KERNEL (PROT_NORMAL)
49 #define _PAGE_KERNEL_RO ((PROT_NORMAL & ~PTE_WRITE) | PTE_RDONLY)
50 #define _PAGE_KERNEL_ROX ((PROT_NORMAL & ~(PTE_WRITE | PTE_PXN)) | PTE_RDONLY)
51 #define _PAGE_KERNEL_EXEC (PROT_NORMAL & ~PTE_PXN)
52 #define _PAGE_KERNEL_EXEC_CONT ((PROT_NORMAL & ~PTE_PXN) | PTE_CONT)
54 #define _PAGE_SHARED (_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)
55 #define _PAGE_SHARED_EXEC (_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_WRITE)
56 #define _PAGE_READONLY (_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN)
57 #define _PAGE_READONLY_EXEC (_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN)
58 #define _PAGE_EXECONLY (_PAGE_DEFAULT | PTE_RDONLY | PTE_NG | PTE_PXN)
61 #define PTE_MAYBE_NG 0
66 #include <asm/cpufeature.h>
67 #include <asm/pgtable-types.h>
69 extern bool arm64_use_ng_mappings;
71 #define PTE_MAYBE_NG (arm64_use_ng_mappings ? PTE_NG : 0)
72 #define PMD_MAYBE_NG (arm64_use_ng_mappings ? PMD_SECT_NG : 0)
75 * If we have userspace only BTI we don't want to mark kernel pages
76 * guarded even if the system does support BTI.
78 #define PTE_MAYBE_GP (system_supports_bti_kernel() ? PTE_GP : 0)
80 #define PAGE_KERNEL __pgprot(_PAGE_KERNEL)
81 #define PAGE_KERNEL_RO __pgprot(_PAGE_KERNEL_RO)
82 #define PAGE_KERNEL_ROX __pgprot(_PAGE_KERNEL_ROX)
83 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_KERNEL_EXEC)
84 #define PAGE_KERNEL_EXEC_CONT __pgprot(_PAGE_KERNEL_EXEC_CONT)
86 #define PAGE_S2_MEMATTR(attr, has_fwb) \
90 __val = PTE_S2_MEMATTR(MT_S2_FWB_ ## attr); \
92 __val = PTE_S2_MEMATTR(MT_S2_ ## attr); \
96 #define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN)
97 /* shared+writable pages are clean by default, hence PTE_RDONLY|PTE_WRITE */
98 #define PAGE_SHARED __pgprot(_PAGE_SHARED)
99 #define PAGE_SHARED_EXEC __pgprot(_PAGE_SHARED_EXEC)
100 #define PAGE_READONLY __pgprot(_PAGE_READONLY)
101 #define PAGE_READONLY_EXEC __pgprot(_PAGE_READONLY_EXEC)
102 #define PAGE_EXECONLY __pgprot(_PAGE_EXECONLY)
104 #endif /* __ASSEMBLY__ */
106 #define pte_pi_index(pte) ( \
107 ((pte & BIT(PTE_PI_IDX_3)) >> (PTE_PI_IDX_3 - 3)) | \
108 ((pte & BIT(PTE_PI_IDX_2)) >> (PTE_PI_IDX_2 - 2)) | \
109 ((pte & BIT(PTE_PI_IDX_1)) >> (PTE_PI_IDX_1 - 1)) | \
110 ((pte & BIT(PTE_PI_IDX_0)) >> (PTE_PI_IDX_0 - 0)))
113 * Page types used via Permission Indirection Extension (PIE). PIE uses
114 * the USER, DBM, PXN and UXN bits to to generate an index which is used
115 * to look up the actual permission in PIR_ELx and PIRE0_EL1. We define
116 * combinations we use on non-PIE systems with the same encoding, for
117 * convenience these are listed here as comments as are the unallocated
121 /* 0: PAGE_DEFAULT */
124 /* 3: PTE_WRITE | PTE_USER */
125 /* 4: PAGE_EXECONLY PTE_PXN */
126 /* 5: PAGE_READONLY_EXEC PTE_PXN | PTE_USER */
127 /* 6: PTE_PXN | PTE_WRITE */
128 /* 7: PAGE_SHARED_EXEC PTE_PXN | PTE_WRITE | PTE_USER */
129 /* 8: PAGE_KERNEL_ROX PTE_UXN */
130 /* 9: PTE_UXN | PTE_USER */
131 /* a: PAGE_KERNEL_EXEC PTE_UXN | PTE_WRITE */
132 /* b: PTE_UXN | PTE_WRITE | PTE_USER */
133 /* c: PAGE_KERNEL_RO PTE_UXN | PTE_PXN */
134 /* d: PAGE_READONLY PTE_UXN | PTE_PXN | PTE_USER */
135 /* e: PAGE_KERNEL PTE_UXN | PTE_PXN | PTE_WRITE */
136 /* f: PAGE_SHARED PTE_UXN | PTE_PXN | PTE_WRITE | PTE_USER */
139 PIRx_ELx_PERM(pte_pi_index(_PAGE_EXECONLY), PIE_X_O) | \
140 PIRx_ELx_PERM(pte_pi_index(_PAGE_READONLY_EXEC), PIE_RX) | \
141 PIRx_ELx_PERM(pte_pi_index(_PAGE_SHARED_EXEC), PIE_RWX) | \
142 PIRx_ELx_PERM(pte_pi_index(_PAGE_READONLY), PIE_R) | \
143 PIRx_ELx_PERM(pte_pi_index(_PAGE_SHARED), PIE_RW))
146 PIRx_ELx_PERM(pte_pi_index(_PAGE_EXECONLY), PIE_NONE_O) | \
147 PIRx_ELx_PERM(pte_pi_index(_PAGE_READONLY_EXEC), PIE_R) | \
148 PIRx_ELx_PERM(pte_pi_index(_PAGE_SHARED_EXEC), PIE_RW) | \
149 PIRx_ELx_PERM(pte_pi_index(_PAGE_READONLY), PIE_R) | \
150 PIRx_ELx_PERM(pte_pi_index(_PAGE_SHARED), PIE_RW) | \
151 PIRx_ELx_PERM(pte_pi_index(_PAGE_KERNEL_ROX), PIE_RX) | \
152 PIRx_ELx_PERM(pte_pi_index(_PAGE_KERNEL_EXEC), PIE_RWX) | \
153 PIRx_ELx_PERM(pte_pi_index(_PAGE_KERNEL_RO), PIE_R) | \
154 PIRx_ELx_PERM(pte_pi_index(_PAGE_KERNEL), PIE_RW))
156 #endif /* __ASM_PGTABLE_PROT_H */