1 /* 2 * Copyright (C) 2016 ARM Ltd. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 #ifndef __ASM_PGTABLE_PROT_H 17 #define __ASM_PGTABLE_PROT_H 18 19 #include <asm/memory.h> 20 #include <asm/pgtable-hwdef.h> 21 22 #include <linux/const.h> 23 24 /* 25 * Software defined PTE bits definition. 26 */ 27 #define PTE_VALID (_AT(pteval_t, 1) << 0) 28 #define PTE_WRITE (PTE_DBM) /* same as DBM (51) */ 29 #define PTE_DIRTY (_AT(pteval_t, 1) << 55) 30 #define PTE_SPECIAL (_AT(pteval_t, 1) << 56) 31 #define PTE_PROT_NONE (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */ 32 33 #ifndef __ASSEMBLY__ 34 35 #include <asm/pgtable-types.h> 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_kernel_unmapped_at_el0() ? PTE_NG : 0) 41 #define PMD_MAYBE_NG (arm64_kernel_unmapped_at_el0() ? PMD_SECT_NG : 0) 42 43 #define PROT_DEFAULT (_PROT_DEFAULT | PTE_MAYBE_NG) 44 #define PROT_SECT_DEFAULT (_PROT_SECT_DEFAULT | PMD_MAYBE_NG) 45 46 #define PROT_DEVICE_nGnRnE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE)) 47 #define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE)) 48 #define PROT_NORMAL_NC (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_NC)) 49 #define PROT_NORMAL_WT (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_WT)) 50 #define PROT_NORMAL (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL)) 51 52 #define PROT_SECT_DEVICE_nGnRE (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE)) 53 #define PROT_SECT_NORMAL (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) 54 #define PROT_SECT_NORMAL_EXEC (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) 55 56 #define _PAGE_DEFAULT (_PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL)) 57 #define _HYP_PAGE_DEFAULT _PAGE_DEFAULT 58 59 #define PAGE_KERNEL __pgprot(PROT_NORMAL) 60 #define PAGE_KERNEL_RO __pgprot((PROT_NORMAL & ~PTE_WRITE) | PTE_RDONLY) 61 #define PAGE_KERNEL_ROX __pgprot((PROT_NORMAL & ~(PTE_WRITE | PTE_PXN)) | PTE_RDONLY) 62 #define PAGE_KERNEL_EXEC __pgprot(PROT_NORMAL & ~PTE_PXN) 63 #define PAGE_KERNEL_EXEC_CONT __pgprot((PROT_NORMAL & ~PTE_PXN) | PTE_CONT) 64 65 #define PAGE_HYP __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_HYP_XN) 66 #define PAGE_HYP_EXEC __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY) 67 #define PAGE_HYP_RO __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY | PTE_HYP_XN) 68 #define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP) 69 70 #define PAGE_S2_MEMATTR(attr) \ 71 ({ \ 72 u64 __val; \ 73 if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) \ 74 __val = PTE_S2_MEMATTR(MT_S2_FWB_ ## attr); \ 75 else \ 76 __val = PTE_S2_MEMATTR(MT_S2_ ## attr); \ 77 __val; \ 78 }) 79 80 #define PAGE_S2_XN \ 81 ({ \ 82 u64 __val; \ 83 if (cpus_have_const_cap(ARM64_HAS_CACHE_DIC)) \ 84 __val = 0; \ 85 else \ 86 __val = PTE_S2_XN; \ 87 __val; \ 88 }) 89 90 #define PAGE_S2 __pgprot(_PROT_DEFAULT | PAGE_S2_MEMATTR(NORMAL) | PTE_S2_RDONLY | PAGE_S2_XN) 91 #define PAGE_S2_DEVICE __pgprot(_PROT_DEFAULT | PAGE_S2_MEMATTR(DEVICE_nGnRE) | PTE_S2_RDONLY | PAGE_S2_XN) 92 93 #define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN) 94 #define PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE) 95 #define PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE) 96 #define PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN) 97 #define PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN) 98 #define PAGE_EXECONLY __pgprot(_PAGE_DEFAULT | PTE_RDONLY | PTE_NG | PTE_PXN) 99 100 #define __P000 PAGE_NONE 101 #define __P001 PAGE_READONLY 102 #define __P010 PAGE_READONLY 103 #define __P011 PAGE_READONLY 104 #define __P100 PAGE_EXECONLY 105 #define __P101 PAGE_READONLY_EXEC 106 #define __P110 PAGE_READONLY_EXEC 107 #define __P111 PAGE_READONLY_EXEC 108 109 #define __S000 PAGE_NONE 110 #define __S001 PAGE_READONLY 111 #define __S010 PAGE_SHARED 112 #define __S011 PAGE_SHARED 113 #define __S100 PAGE_EXECONLY 114 #define __S101 PAGE_READONLY_EXEC 115 #define __S110 PAGE_SHARED_EXEC 116 #define __S111 PAGE_SHARED_EXEC 117 118 #endif /* __ASSEMBLY__ */ 119 120 #endif /* __ASM_PGTABLE_PROT_H */ 121