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 26 extern 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 */ 112