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111 lines
4.2 KiB
111 lines
4.2 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2016 ARM Ltd. |
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*/ |
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#ifndef __ASM_PGTABLE_PROT_H |
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#define __ASM_PGTABLE_PROT_H |
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#include <asm/memory.h> |
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#include <asm/pgtable-hwdef.h> |
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#include <linux/const.h> |
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/* |
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* Software defined PTE bits definition. |
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*/ |
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#define PTE_WRITE (PTE_DBM) /* same as DBM (51) */ |
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#define PTE_DIRTY (_AT(pteval_t, 1) << 55) |
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#define PTE_SPECIAL (_AT(pteval_t, 1) << 56) |
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#define PTE_DEVMAP (_AT(pteval_t, 1) << 57) |
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#define PTE_PROT_NONE (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */ |
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/* |
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* This bit indicates that the entry is present i.e. pmd_page() |
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* still points to a valid huge page in memory even if the pmd |
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* has been invalidated. |
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*/ |
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#define PMD_PRESENT_INVALID (_AT(pteval_t, 1) << 59) /* only when !PMD_SECT_VALID */ |
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#ifndef __ASSEMBLY__ |
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#include <asm/cpufeature.h> |
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#include <asm/pgtable-types.h> |
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extern bool arm64_use_ng_mappings; |
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#define _PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED) |
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#define _PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S) |
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#define PTE_MAYBE_NG (arm64_use_ng_mappings ? PTE_NG : 0) |
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#define PMD_MAYBE_NG (arm64_use_ng_mappings ? PMD_SECT_NG : 0) |
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/* |
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* If we have userspace only BTI we don't want to mark kernel pages |
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* guarded even if the system does support BTI. |
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*/ |
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#ifdef CONFIG_ARM64_BTI_KERNEL |
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#define PTE_MAYBE_GP (system_supports_bti() ? PTE_GP : 0) |
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#else |
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#define PTE_MAYBE_GP 0 |
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#endif |
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#define PROT_DEFAULT (_PROT_DEFAULT | PTE_MAYBE_NG) |
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#define PROT_SECT_DEFAULT (_PROT_SECT_DEFAULT | PMD_MAYBE_NG) |
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#define PROT_DEVICE_nGnRnE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE)) |
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#define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE)) |
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#define PROT_NORMAL_NC (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_NC)) |
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#define PROT_NORMAL_WT (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_WT)) |
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#define PROT_NORMAL (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL)) |
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#define PROT_NORMAL_TAGGED (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_TAGGED)) |
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#define PROT_SECT_DEVICE_nGnRE (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE)) |
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#define PROT_SECT_NORMAL (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) |
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#define PROT_SECT_NORMAL_EXEC (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL)) |
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#define _PAGE_DEFAULT (_PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL)) |
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#define PAGE_KERNEL __pgprot(PROT_NORMAL) |
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#define PAGE_KERNEL_RO __pgprot((PROT_NORMAL & ~PTE_WRITE) | PTE_RDONLY) |
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#define PAGE_KERNEL_ROX __pgprot((PROT_NORMAL & ~(PTE_WRITE | PTE_PXN)) | PTE_RDONLY) |
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#define PAGE_KERNEL_EXEC __pgprot(PROT_NORMAL & ~PTE_PXN) |
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#define PAGE_KERNEL_EXEC_CONT __pgprot((PROT_NORMAL & ~PTE_PXN) | PTE_CONT) |
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#define PAGE_S2_MEMATTR(attr) \ |
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({ \ |
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u64 __val; \ |
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if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) \ |
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__val = PTE_S2_MEMATTR(MT_S2_FWB_ ## attr); \ |
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else \ |
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__val = PTE_S2_MEMATTR(MT_S2_ ## attr); \ |
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__val; \ |
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}) |
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#define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN) |
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/* shared+writable pages are clean by default, hence PTE_RDONLY|PTE_WRITE */ |
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#define PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE) |
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#define PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_WRITE) |
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#define PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN) |
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#define PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN) |
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#define __P000 PAGE_NONE |
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#define __P001 PAGE_READONLY |
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#define __P010 PAGE_READONLY |
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#define __P011 PAGE_READONLY |
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#define __P100 PAGE_READONLY_EXEC |
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#define __P101 PAGE_READONLY_EXEC |
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#define __P110 PAGE_READONLY_EXEC |
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#define __P111 PAGE_READONLY_EXEC |
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#define __S000 PAGE_NONE |
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#define __S001 PAGE_READONLY |
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#define __S010 PAGE_SHARED |
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#define __S011 PAGE_SHARED |
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#define __S100 PAGE_READONLY_EXEC |
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#define __S101 PAGE_READONLY_EXEC |
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#define __S110 PAGE_SHARED_EXEC |
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#define __S111 PAGE_SHARED_EXEC |
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#endif /* __ASSEMBLY__ */ |
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#endif /* __ASM_PGTABLE_PROT_H */
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