| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * arch/arm/include/asm/pgtable.h |
| * |
| * Copyright (C) 1995-2002 Russell King |
| */ |
| #ifndef _ASMARM_PGTABLE_H |
| #define _ASMARM_PGTABLE_H |
| |
| #include <linux/const.h> |
| #include <asm/proc-fns.h> |
| |
| #ifndef __ASSEMBLY__ |
| /* |
| * ZERO_PAGE is a global shared page that is always zero: used |
| * for zero-mapped memory areas etc.. |
| */ |
| extern struct page *empty_zero_page; |
| #define ZERO_PAGE(vaddr) (empty_zero_page) |
| #endif |
| |
| #ifndef CONFIG_MMU |
| |
| #include <asm-generic/pgtable-nopud.h> |
| #include <asm/pgtable-nommu.h> |
| |
| #else |
| |
| #include <asm-generic/pgtable-nopud.h> |
| #include <asm/memory.h> |
| #include <asm/pgtable-hwdef.h> |
| |
| |
| #include <asm/tlbflush.h> |
| |
| #ifdef CONFIG_ARM_LPAE |
| #include <asm/pgtable-3level.h> |
| #else |
| #include <asm/pgtable-2level.h> |
| #endif |
| |
| /* |
| * Just any arbitrary offset to the start of the vmalloc VM area: the |
| * current 8MB value just means that there will be a 8MB "hole" after the |
| * physical memory until the kernel virtual memory starts. That means that |
| * any out-of-bounds memory accesses will hopefully be caught. |
| * The vmalloc() routines leaves a hole of 4kB between each vmalloced |
| * area for the same reason. ;) |
| */ |
| #define VMALLOC_OFFSET (8*1024*1024) |
| #define VMALLOC_START (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) |
| #define VMALLOC_END 0xff800000UL |
| |
| #define LIBRARY_TEXT_START 0x0c000000 |
| |
| #ifndef __ASSEMBLY__ |
| extern void __pte_error(const char *file, int line, pte_t); |
| extern void __pmd_error(const char *file, int line, pmd_t); |
| extern void __pgd_error(const char *file, int line, pgd_t); |
| |
| #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte) |
| #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd) |
| #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd) |
| |
| /* |
| * This is the lowest virtual address we can permit any user space |
| * mapping to be mapped at. This is particularly important for |
| * non-high vector CPUs. |
| */ |
| #define FIRST_USER_ADDRESS (PAGE_SIZE * 2) |
| |
| /* |
| * Use TASK_SIZE as the ceiling argument for free_pgtables() and |
| * free_pgd_range() to avoid freeing the modules pmd when LPAE is enabled (pmd |
| * page shared between user and kernel). |
| */ |
| #ifdef CONFIG_ARM_LPAE |
| #define USER_PGTABLES_CEILING TASK_SIZE |
| #endif |
| |
| /* |
| * The pgprot_* and protection_map entries will be fixed up in runtime |
| * to include the cachable and bufferable bits based on memory policy, |
| * as well as any architecture dependent bits like global/ASID and SMP |
| * shared mapping bits. |
| */ |
| #define _L_PTE_DEFAULT L_PTE_PRESENT | L_PTE_YOUNG |
| |
| extern pgprot_t pgprot_user; |
| extern pgprot_t pgprot_kernel; |
| |
| #define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b)) |
| |
| #define PAGE_NONE _MOD_PROT(pgprot_user, L_PTE_XN | L_PTE_RDONLY | L_PTE_NONE) |
| #define PAGE_SHARED _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_XN) |
| #define PAGE_SHARED_EXEC _MOD_PROT(pgprot_user, L_PTE_USER) |
| #define PAGE_COPY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) |
| #define PAGE_COPY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY) |
| #define PAGE_READONLY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) |
| #define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY) |
| #define PAGE_KERNEL _MOD_PROT(pgprot_kernel, L_PTE_XN) |
| #define PAGE_KERNEL_EXEC pgprot_kernel |
| |
| #define __PAGE_NONE __pgprot(_L_PTE_DEFAULT | L_PTE_RDONLY | L_PTE_XN | L_PTE_NONE) |
| #define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_XN) |
| #define __PAGE_SHARED_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER) |
| #define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) |
| #define __PAGE_COPY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY) |
| #define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) |
| #define __PAGE_READONLY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY) |
| |
| #define __pgprot_modify(prot,mask,bits) \ |
| __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) |
| |
| #define pgprot_noncached(prot) \ |
| __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED) |
| |
| #define pgprot_writecombine(prot) \ |
| __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE) |
| |
| #define pgprot_stronglyordered(prot) \ |
| __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED) |
| |
| #define pgprot_device(prot) \ |
| __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_DEV_SHARED | L_PTE_SHARED | L_PTE_DIRTY | L_PTE_XN) |
| |
| #ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE |
| #define pgprot_dmacoherent(prot) \ |
| __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE | L_PTE_XN) |
| #define __HAVE_PHYS_MEM_ACCESS_PROT |
| struct file; |
| extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
| unsigned long size, pgprot_t vma_prot); |
| #else |
| #define pgprot_dmacoherent(prot) \ |
| __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED | L_PTE_XN) |
| #endif |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| /* |
| * The table below defines the page protection levels that we insert into our |
| * Linux page table version. These get translated into the best that the |
| * architecture can perform. Note that on most ARM hardware: |
| * 1) We cannot do execute protection |
| * 2) If we could do execute protection, then read is implied |
| * 3) write implies read permissions |
| */ |
| |
| #ifndef __ASSEMBLY__ |
| |
| extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; |
| |
| #define pud_page(pud) pmd_page(__pmd(pud_val(pud))) |
| #define pud_write(pud) pmd_write(__pmd(pud_val(pud))) |
| |
| #define pmd_none(pmd) (!pmd_val(pmd)) |
| |
| static inline pte_t *pmd_page_vaddr(pmd_t pmd) |
| { |
| return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); |
| } |
| |
| #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) |
| |
| #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) |
| #define pfn_pte(pfn,prot) __pte(__pfn_to_phys(pfn) | pgprot_val(prot)) |
| |
| #define pte_page(pte) pfn_to_page(pte_pfn(pte)) |
| #define mk_pte(page,prot) pfn_pte(page_to_pfn(page), prot) |
| |
| #define pte_clear(mm,addr,ptep) set_pte_ext(ptep, __pte(0), 0) |
| |
| #define pte_isset(pte, val) ((u32)(val) == (val) ? pte_val(pte) & (val) \ |
| : !!(pte_val(pte) & (val))) |
| #define pte_isclear(pte, val) (!(pte_val(pte) & (val))) |
| |
| #define pte_none(pte) (!pte_val(pte)) |
| #define pte_present(pte) (pte_isset((pte), L_PTE_PRESENT)) |
| #define pte_valid(pte) (pte_isset((pte), L_PTE_VALID)) |
| #define pte_accessible(mm, pte) (mm_tlb_flush_pending(mm) ? pte_present(pte) : pte_valid(pte)) |
| #define pte_write(pte) (pte_isclear((pte), L_PTE_RDONLY)) |
| #define pte_dirty(pte) (pte_isset((pte), L_PTE_DIRTY)) |
| #define pte_young(pte) (pte_isset((pte), L_PTE_YOUNG)) |
| #define pte_exec(pte) (pte_isclear((pte), L_PTE_XN)) |
| |
| #define pte_valid_user(pte) \ |
| (pte_valid(pte) && pte_isset((pte), L_PTE_USER) && pte_young(pte)) |
| |
| static inline bool pte_access_permitted(pte_t pte, bool write) |
| { |
| pteval_t mask = L_PTE_PRESENT | L_PTE_USER; |
| pteval_t needed = mask; |
| |
| if (write) |
| mask |= L_PTE_RDONLY; |
| |
| return (pte_val(pte) & mask) == needed; |
| } |
| #define pte_access_permitted pte_access_permitted |
| |
| #if __LINUX_ARM_ARCH__ < 6 |
| static inline void __sync_icache_dcache(pte_t pteval) |
| { |
| } |
| #else |
| extern void __sync_icache_dcache(pte_t pteval); |
| #endif |
| |
| void set_pte_at(struct mm_struct *mm, unsigned long addr, |
| pte_t *ptep, pte_t pteval); |
| |
| static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot) |
| { |
| pte_val(pte) &= ~pgprot_val(prot); |
| return pte; |
| } |
| |
| static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot) |
| { |
| pte_val(pte) |= pgprot_val(prot); |
| return pte; |
| } |
| |
| static inline pte_t pte_wrprotect(pte_t pte) |
| { |
| return set_pte_bit(pte, __pgprot(L_PTE_RDONLY)); |
| } |
| |
| static inline pte_t pte_mkwrite(pte_t pte) |
| { |
| return clear_pte_bit(pte, __pgprot(L_PTE_RDONLY)); |
| } |
| |
| static inline pte_t pte_mkclean(pte_t pte) |
| { |
| return clear_pte_bit(pte, __pgprot(L_PTE_DIRTY)); |
| } |
| |
| static inline pte_t pte_mkdirty(pte_t pte) |
| { |
| return set_pte_bit(pte, __pgprot(L_PTE_DIRTY)); |
| } |
| |
| static inline pte_t pte_mkold(pte_t pte) |
| { |
| return clear_pte_bit(pte, __pgprot(L_PTE_YOUNG)); |
| } |
| |
| static inline pte_t pte_mkyoung(pte_t pte) |
| { |
| return set_pte_bit(pte, __pgprot(L_PTE_YOUNG)); |
| } |
| |
| static inline pte_t pte_mkexec(pte_t pte) |
| { |
| return clear_pte_bit(pte, __pgprot(L_PTE_XN)); |
| } |
| |
| static inline pte_t pte_mknexec(pte_t pte) |
| { |
| return set_pte_bit(pte, __pgprot(L_PTE_XN)); |
| } |
| |
| static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
| { |
| const pteval_t mask = L_PTE_XN | L_PTE_RDONLY | L_PTE_USER | |
| L_PTE_NONE | L_PTE_VALID; |
| pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); |
| return pte; |
| } |
| |
| /* |
| * Encode and decode a swap entry. Swap entries are stored in the Linux |
| * page tables as follows: |
| * |
| * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 |
| * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 |
| * <--------------- offset ------------------------> < type -> 0 0 |
| * |
| * This gives us up to 31 swap files and 128GB per swap file. Note that |
| * the offset field is always non-zero. |
| */ |
| #define __SWP_TYPE_SHIFT 2 |
| #define __SWP_TYPE_BITS 5 |
| #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) |
| #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) |
| |
| #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) |
| #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) |
| #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) |
| |
| #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) |
| #define __swp_entry_to_pte(swp) __pte((swp).val | PTE_TYPE_FAULT) |
| |
| /* |
| * It is an error for the kernel to have more swap files than we can |
| * encode in the PTEs. This ensures that we know when MAX_SWAPFILES |
| * is increased beyond what we presently support. |
| */ |
| #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) |
| |
| /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ |
| /* FIXME: this is not correct */ |
| #define kern_addr_valid(addr) (1) |
| |
| /* |
| * We provide our own arch_get_unmapped_area to cope with VIPT caches. |
| */ |
| #define HAVE_ARCH_UNMAPPED_AREA |
| #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| #endif /* CONFIG_MMU */ |
| |
| #endif /* _ASMARM_PGTABLE_H */ |