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_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 */ 22 23 /* 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. 27 */ 28 #define PMD_PRESENT_INVALID (_AT(pteval_t, 1) << 59) /* only when !PMD_SECT_VALID */ 29 30 #ifndef __ASSEMBLY__ 31 32 #include <asm/cpufeature.h> 33 #include <asm/pgtable-types.h> 34 35 extern bool arm64_use_ng_mappings; 36 37 #define _PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED) 38 #define _PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S) 39 40 #define PTE_MAYBE_NG (arm64_use_ng_mappings ? PTE_NG : 0) 41 #define PMD_MAYBE_NG (arm64_use_ng_mappings ? PMD_SECT_NG : 0) 42 43 /* 44 * If we have userspace only BTI we don't want to mark kernel pages 45 * guarded even if the system does support BTI. 46 */ 47 #ifdef CONFIG_ARM64_BTI_KERNEL 48 #define PTE_MAYBE_GP (system_supports_bti() ? PTE_GP : 0) 49 #else 50 #define PTE_MAYBE_GP 0 51 #endif 52 53 #define PROT_DEFAULT (_PROT_DEFAULT | PTE_MAYBE_NG) 54 #define PROT_SECT_DEFAULT (_PROT_SECT_DEFAULT | PMD_MAYBE_NG) 55 56 #define PROT_DEVICE_nGnRnE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE)) 57 #define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE)) 58 #define PROT_NORMAL_NC (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_NC)) 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, has_fwb) \ 75 ({ \ 76 u64 __val; \ 77 if (has_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 #define PAGE_EXECONLY __pgprot(_PAGE_DEFAULT | PTE_RDONLY | PTE_NG | PTE_PXN) 91 92 #endif /* __ASSEMBLY__ */ 93 94 #endif /* __ASM_PGTABLE_PROT_H */ 95