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