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/* 23 * This bit indicates that the entry is present i.e. pmd_page() 24 * still points to a valid huge page in memory even if the pmd 25 * has been invalidated. 26 */ 27#define PMD_PRESENT_INVALID (_AT(pteval_t, 1) << 59) /* only when !PMD_SECT_VALID */ 28 29#ifndef __ASSEMBLY__ 30 31#include <asm/cpufeature.h> 32#include <asm/pgtable-types.h> 33 34extern bool arm64_use_ng_mappings; 35 36#define _PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED) 37#define _PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S) 38 39#define PTE_MAYBE_NG (arm64_use_ng_mappings ? PTE_NG : 0) 40#define PMD_MAYBE_NG (arm64_use_ng_mappings ? PMD_SECT_NG : 0) 41 42/* 43 * If we have userspace only BTI we don't want to mark kernel pages 44 * guarded even if the system does support BTI. 45 */ 46#ifdef CONFIG_ARM64_BTI_KERNEL 47#define PTE_MAYBE_GP (system_supports_bti() ? PTE_GP : 0) 48#else 49#define PTE_MAYBE_GP 0 50#endif 51 52#define PROT_DEFAULT (_PROT_DEFAULT | PTE_MAYBE_NG) 53#define PROT_SECT_DEFAULT (_PROT_SECT_DEFAULT | PMD_MAYBE_NG) 54 55#define PROT_DEVICE_nGnRnE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE)) 56#define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE)) 57#define PROT_NORMAL_NC (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_NC)) 58#define PROT_NORMAL (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL)) 59#define PROT_NORMAL_TAGGED (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_TAGGED)) 60 61#define PROT_SECT_DEVICE_nGnRE (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE)) 62#define PROT_SECT_NORMAL (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) 63#define PROT_SECT_NORMAL_EXEC (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) 64 65#define _PAGE_DEFAULT (_PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL)) 66 67#define PAGE_KERNEL __pgprot(PROT_NORMAL) 68#define PAGE_KERNEL_RO __pgprot((PROT_NORMAL & ~PTE_WRITE) | PTE_RDONLY) 69#define PAGE_KERNEL_ROX __pgprot((PROT_NORMAL & ~(PTE_WRITE | PTE_PXN)) | PTE_RDONLY) 70#define PAGE_KERNEL_EXEC __pgprot(PROT_NORMAL & ~PTE_PXN) 71#define PAGE_KERNEL_EXEC_CONT __pgprot((PROT_NORMAL & ~PTE_PXN) | PTE_CONT) 72 73#define PAGE_S2_MEMATTR(attr, has_fwb) \ 74 ({ \ 75 u64 __val; \ 76 if (has_fwb) \ 77 __val = PTE_S2_MEMATTR(MT_S2_FWB_ ## attr); \ 78 else \ 79 __val = PTE_S2_MEMATTR(MT_S2_ ## attr); \ 80 __val; \ 81 }) 82 83#define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN) 84/* shared+writable pages are clean by default, hence PTE_RDONLY|PTE_WRITE */ 85#define PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE) 86#define PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_WRITE) 87#define PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN) 88#define PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN) 89#define PAGE_EXECONLY __pgprot(_PAGE_DEFAULT | 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_EXECONLY 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_EXECONLY 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