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/cpufeature.h> 25 #include <asm/pgtable-types.h> 26 27 extern bool arm64_use_ng_mappings; 28 29 #define _PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED) 30 #define _PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S) 31 32 #define PTE_MAYBE_NG (arm64_use_ng_mappings ? PTE_NG : 0) 33 #define PMD_MAYBE_NG (arm64_use_ng_mappings ? PMD_SECT_NG : 0) 34 35 /* 36 * If we have userspace only BTI we don't want to mark kernel pages 37 * guarded even if the system does support BTI. 38 */ 39 #ifdef CONFIG_ARM64_BTI_KERNEL 40 #define PTE_MAYBE_GP (system_supports_bti() ? PTE_GP : 0) 41 #else 42 #define PTE_MAYBE_GP 0 43 #endif 44 45 #define PROT_DEFAULT (_PROT_DEFAULT | PTE_MAYBE_NG) 46 #define PROT_SECT_DEFAULT (_PROT_SECT_DEFAULT | PMD_MAYBE_NG) 47 48 #define PROT_DEVICE_nGnRnE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE)) 49 #define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE)) 50 #define PROT_NORMAL_NC (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_NC)) 51 #define PROT_NORMAL_WT (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_WT)) 52 #define PROT_NORMAL (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL)) 53 54 #define PROT_SECT_DEVICE_nGnRE (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE)) 55 #define PROT_SECT_NORMAL (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) 56 #define PROT_SECT_NORMAL_EXEC (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) 57 58 #define _PAGE_DEFAULT (_PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL)) 59 #define _HYP_PAGE_DEFAULT _PAGE_DEFAULT 60 61 #define PAGE_KERNEL __pgprot(PROT_NORMAL) 62 #define PAGE_KERNEL_RO __pgprot((PROT_NORMAL & ~PTE_WRITE) | PTE_RDONLY) 63 #define PAGE_KERNEL_ROX __pgprot((PROT_NORMAL & ~(PTE_WRITE | PTE_PXN)) | PTE_RDONLY) 64 #define PAGE_KERNEL_EXEC __pgprot(PROT_NORMAL & ~PTE_PXN) 65 #define PAGE_KERNEL_EXEC_CONT __pgprot((PROT_NORMAL & ~PTE_PXN) | PTE_CONT) 66 67 #define PAGE_HYP __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_HYP_XN) 68 #define PAGE_HYP_EXEC __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY) 69 #define PAGE_HYP_RO __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY | PTE_HYP_XN) 70 #define PAGE_HYP_DEVICE __pgprot(_PROT_DEFAULT | PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_HYP | PTE_HYP_XN) 71 72 #define PAGE_S2_MEMATTR(attr) \ 73 ({ \ 74 u64 __val; \ 75 if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) \ 76 __val = PTE_S2_MEMATTR(MT_S2_FWB_ ## attr); \ 77 else \ 78 __val = PTE_S2_MEMATTR(MT_S2_ ## attr); \ 79 __val; \ 80 }) 81 82 #define PAGE_S2_XN \ 83 ({ \ 84 u64 __val; \ 85 if (cpus_have_const_cap(ARM64_HAS_CACHE_DIC)) \ 86 __val = 0; \ 87 else \ 88 __val = PTE_S2_XN; \ 89 __val; \ 90 }) 91 92 #define PAGE_S2 __pgprot(_PROT_DEFAULT | PAGE_S2_MEMATTR(NORMAL) | PTE_S2_RDONLY | PAGE_S2_XN) 93 #define PAGE_S2_DEVICE __pgprot(_PROT_DEFAULT | PAGE_S2_MEMATTR(DEVICE_nGnRE) | PTE_S2_RDONLY | PTE_S2_XN) 94 95 #define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN) 96 /* shared+writable pages are clean by default, hence PTE_RDONLY|PTE_WRITE */ 97 #define PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE) 98 #define PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_WRITE) 99 #define PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN) 100 #define PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN) 101 102 #define __P000 PAGE_NONE 103 #define __P001 PAGE_READONLY 104 #define __P010 PAGE_READONLY 105 #define __P011 PAGE_READONLY 106 #define __P100 PAGE_READONLY_EXEC 107 #define __P101 PAGE_READONLY_EXEC 108 #define __P110 PAGE_READONLY_EXEC 109 #define __P111 PAGE_READONLY_EXEC 110 111 #define __S000 PAGE_NONE 112 #define __S001 PAGE_READONLY 113 #define __S010 PAGE_SHARED 114 #define __S011 PAGE_SHARED 115 #define __S100 PAGE_READONLY_EXEC 116 #define __S101 PAGE_READONLY_EXEC 117 #define __S110 PAGE_SHARED_EXEC 118 #define __S111 PAGE_SHARED_EXEC 119 120 #endif /* __ASSEMBLY__ */ 121 122 #endif /* __ASM_PGTABLE_PROT_H */ 123