pgtable-prot.h (4377B)
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 35extern 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#define __P000 PAGE_NONE 93#define __P001 PAGE_READONLY 94#define __P010 PAGE_READONLY 95#define __P011 PAGE_READONLY 96#define __P100 PAGE_READONLY_EXEC /* PAGE_EXECONLY if Enhanced PAN */ 97#define __P101 PAGE_READONLY_EXEC 98#define __P110 PAGE_READONLY_EXEC 99#define __P111 PAGE_READONLY_EXEC 100 101#define __S000 PAGE_NONE 102#define __S001 PAGE_READONLY 103#define __S010 PAGE_SHARED 104#define __S011 PAGE_SHARED 105#define __S100 PAGE_READONLY_EXEC /* PAGE_EXECONLY if Enhanced PAN */ 106#define __S101 PAGE_READONLY_EXEC 107#define __S110 PAGE_SHARED_EXEC 108#define __S111 PAGE_SHARED_EXEC 109 110#endif /* __ASSEMBLY__ */ 111 112#endif /* __ASM_PGTABLE_PROT_H */