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559 lines
14 KiB
559 lines
14 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
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* |
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* Derived from MIPS: |
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle |
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* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. |
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*/ |
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#ifndef _ASM_PGTABLE_H |
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#define _ASM_PGTABLE_H |
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#include <linux/compiler.h> |
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#include <asm/addrspace.h> |
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#include <asm/pgtable-bits.h> |
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#if CONFIG_PGTABLE_LEVELS == 2 |
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#include <asm-generic/pgtable-nopmd.h> |
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#elif CONFIG_PGTABLE_LEVELS == 3 |
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#include <asm-generic/pgtable-nopud.h> |
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#else |
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#include <asm-generic/pgtable-nop4d.h> |
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#endif |
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#if CONFIG_PGTABLE_LEVELS == 2 |
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#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3)) |
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#elif CONFIG_PGTABLE_LEVELS == 3 |
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#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3)) |
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#define PMD_SIZE (1UL << PMD_SHIFT) |
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#define PMD_MASK (~(PMD_SIZE-1)) |
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#define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT - 3)) |
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#elif CONFIG_PGTABLE_LEVELS == 4 |
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#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3)) |
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#define PMD_SIZE (1UL << PMD_SHIFT) |
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#define PMD_MASK (~(PMD_SIZE-1)) |
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#define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT - 3)) |
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#define PUD_SIZE (1UL << PUD_SHIFT) |
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#define PUD_MASK (~(PUD_SIZE-1)) |
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#define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT - 3)) |
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#endif |
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
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#define PGDIR_MASK (~(PGDIR_SIZE-1)) |
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#define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT - 3)) |
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#define PTRS_PER_PGD (PAGE_SIZE >> 3) |
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#if CONFIG_PGTABLE_LEVELS > 3 |
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#define PTRS_PER_PUD (PAGE_SIZE >> 3) |
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#endif |
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#if CONFIG_PGTABLE_LEVELS > 2 |
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#define PTRS_PER_PMD (PAGE_SIZE >> 3) |
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#endif |
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#define PTRS_PER_PTE (PAGE_SIZE >> 3) |
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#define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1) |
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#ifndef __ASSEMBLY__ |
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#include <linux/mm_types.h> |
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#include <linux/mmzone.h> |
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#include <asm/fixmap.h> |
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struct mm_struct; |
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struct vm_area_struct; |
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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 unsigned long empty_zero_page; |
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extern unsigned long zero_page_mask; |
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#define ZERO_PAGE(vaddr) \ |
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(virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) |
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#define __HAVE_COLOR_ZERO_PAGE |
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/* |
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* TLB refill handlers may also map the vmalloc area into xkvrange. |
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* Avoid the first couple of pages so NULL pointer dereferences will |
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* still reliably trap. |
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*/ |
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#define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE)) |
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#define MODULES_END (MODULES_VADDR + SZ_256M) |
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#define VMALLOC_START MODULES_END |
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#define VMALLOC_END \ |
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(vm_map_base + \ |
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min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE) |
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#define pte_ERROR(e) \ |
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pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) |
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#ifndef __PAGETABLE_PMD_FOLDED |
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#define pmd_ERROR(e) \ |
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pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) |
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#endif |
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#ifndef __PAGETABLE_PUD_FOLDED |
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#define pud_ERROR(e) \ |
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pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) |
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#endif |
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#define pgd_ERROR(e) \ |
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pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) |
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extern pte_t invalid_pte_table[PTRS_PER_PTE]; |
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#ifndef __PAGETABLE_PUD_FOLDED |
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typedef struct { unsigned long pud; } pud_t; |
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#define pud_val(x) ((x).pud) |
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#define __pud(x) ((pud_t) { (x) }) |
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extern pud_t invalid_pud_table[PTRS_PER_PUD]; |
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/* |
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* Empty pgd/p4d entries point to the invalid_pud_table. |
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*/ |
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static inline int p4d_none(p4d_t p4d) |
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{ |
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return p4d_val(p4d) == (unsigned long)invalid_pud_table; |
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} |
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static inline int p4d_bad(p4d_t p4d) |
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{ |
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return p4d_val(p4d) & ~PAGE_MASK; |
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} |
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static inline int p4d_present(p4d_t p4d) |
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{ |
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return p4d_val(p4d) != (unsigned long)invalid_pud_table; |
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} |
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static inline void p4d_clear(p4d_t *p4dp) |
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{ |
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p4d_val(*p4dp) = (unsigned long)invalid_pud_table; |
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} |
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static inline pud_t *p4d_pgtable(p4d_t p4d) |
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{ |
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return (pud_t *)p4d_val(p4d); |
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} |
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static inline void set_p4d(p4d_t *p4d, p4d_t p4dval) |
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{ |
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*p4d = p4dval; |
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} |
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#define p4d_phys(p4d) PHYSADDR(p4d_val(p4d)) |
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#define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT)) |
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#endif |
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#ifndef __PAGETABLE_PMD_FOLDED |
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typedef struct { unsigned long pmd; } pmd_t; |
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#define pmd_val(x) ((x).pmd) |
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#define __pmd(x) ((pmd_t) { (x) }) |
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extern pmd_t invalid_pmd_table[PTRS_PER_PMD]; |
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/* |
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* Empty pud entries point to the invalid_pmd_table. |
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*/ |
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static inline int pud_none(pud_t pud) |
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{ |
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return pud_val(pud) == (unsigned long)invalid_pmd_table; |
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} |
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static inline int pud_bad(pud_t pud) |
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{ |
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return pud_val(pud) & ~PAGE_MASK; |
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} |
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static inline int pud_present(pud_t pud) |
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{ |
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return pud_val(pud) != (unsigned long)invalid_pmd_table; |
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} |
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static inline void pud_clear(pud_t *pudp) |
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{ |
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pud_val(*pudp) = ((unsigned long)invalid_pmd_table); |
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} |
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static inline pmd_t *pud_pgtable(pud_t pud) |
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{ |
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return (pmd_t *)pud_val(pud); |
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} |
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#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while (0) |
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#define pud_phys(pud) PHYSADDR(pud_val(pud)) |
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#define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT)) |
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#endif |
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/* |
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* Empty pmd entries point to the invalid_pte_table. |
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*/ |
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static inline int pmd_none(pmd_t pmd) |
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{ |
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return pmd_val(pmd) == (unsigned long)invalid_pte_table; |
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} |
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static inline int pmd_bad(pmd_t pmd) |
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{ |
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return (pmd_val(pmd) & ~PAGE_MASK); |
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} |
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static inline int pmd_present(pmd_t pmd) |
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{ |
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if (unlikely(pmd_val(pmd) & _PAGE_HUGE)) |
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return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE)); |
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return pmd_val(pmd) != (unsigned long)invalid_pte_table; |
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} |
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static inline void pmd_clear(pmd_t *pmdp) |
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{ |
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pmd_val(*pmdp) = ((unsigned long)invalid_pte_table); |
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} |
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#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while (0) |
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#define pmd_phys(pmd) PHYSADDR(pmd_val(pmd)) |
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#ifndef CONFIG_TRANSPARENT_HUGEPAGE |
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#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) |
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
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#define pmd_page_vaddr(pmd) pmd_val(pmd) |
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extern pmd_t mk_pmd(struct page *page, pgprot_t prot); |
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extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); |
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#define pte_page(x) pfn_to_page(pte_pfn(x)) |
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#define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> _PFN_SHIFT)) |
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#define pfn_pte(pfn, prot) __pte(((pfn) << _PFN_SHIFT) | pgprot_val(prot)) |
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#define pfn_pmd(pfn, prot) __pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot)) |
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/* |
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* Initialize a new pgd / pmd table with invalid pointers. |
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*/ |
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extern void pgd_init(unsigned long page); |
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extern void pud_init(unsigned long page, unsigned long pagetable); |
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extern void pmd_init(unsigned long page, unsigned long pagetable); |
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/* |
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* Non-present pages: high 40 bits are offset, next 8 bits type, |
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* low 16 bits zero. |
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*/ |
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static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) |
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{ pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; } |
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#define __swp_type(x) (((x).val >> 16) & 0xff) |
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#define __swp_offset(x) ((x).val >> 24) |
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#define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) |
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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(x) ((pte_t) { (x).val }) |
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#define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) |
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#define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE }) |
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extern void paging_init(void); |
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#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) |
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#define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) |
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#define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) |
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static inline void set_pte(pte_t *ptep, pte_t pteval) |
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{ |
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*ptep = pteval; |
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if (pte_val(pteval) & _PAGE_GLOBAL) { |
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pte_t *buddy = ptep_buddy(ptep); |
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/* |
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* Make sure the buddy is global too (if it's !none, |
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* it better already be global) |
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*/ |
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#ifdef CONFIG_SMP |
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/* |
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* For SMP, multiple CPUs can race, so we need to do |
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* this atomically. |
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*/ |
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unsigned long page_global = _PAGE_GLOBAL; |
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unsigned long tmp; |
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__asm__ __volatile__ ( |
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"1:" __LL "%[tmp], %[buddy] \n" |
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" bnez %[tmp], 2f \n" |
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" or %[tmp], %[tmp], %[global] \n" |
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__SC "%[tmp], %[buddy] \n" |
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" beqz %[tmp], 1b \n" |
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" nop \n" |
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"2: \n" |
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__WEAK_LLSC_MB |
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: [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp) |
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: [global] "r" (page_global)); |
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#else /* !CONFIG_SMP */ |
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if (pte_none(*buddy)) |
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pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; |
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#endif /* CONFIG_SMP */ |
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} |
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} |
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static inline 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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{ |
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set_pte(ptep, pteval); |
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} |
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static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) |
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{ |
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/* Preserve global status for the pair */ |
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if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) |
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set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); |
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else |
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set_pte_at(mm, addr, ptep, __pte(0)); |
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} |
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#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) |
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#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) |
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#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) |
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extern pgd_t swapper_pg_dir[]; |
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extern pgd_t invalid_pg_dir[]; |
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/* |
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* The following only work if pte_present() is true. |
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* Undefined behaviour if not.. |
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*/ |
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static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } |
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static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } |
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static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } |
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static inline pte_t pte_mkold(pte_t pte) |
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{ |
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pte_val(pte) &= ~_PAGE_ACCESSED; |
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return pte; |
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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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pte_val(pte) |= _PAGE_ACCESSED; |
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return pte; |
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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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pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); |
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return pte; |
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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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pte_val(pte) |= (_PAGE_DIRTY | _PAGE_MODIFIED); |
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return pte; |
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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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pte_val(pte) |= (_PAGE_WRITE | _PAGE_DIRTY); |
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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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pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); |
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return pte; |
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} |
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static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } |
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static inline pte_t pte_mkhuge(pte_t pte) |
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{ |
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pte_val(pte) |= _PAGE_HUGE; |
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return pte; |
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} |
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#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL) |
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static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } |
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static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } |
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#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ |
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#define pte_accessible pte_accessible |
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static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a) |
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{ |
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if (pte_val(a) & _PAGE_PRESENT) |
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return true; |
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if ((pte_val(a) & _PAGE_PROTNONE) && |
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atomic_read(&mm->tlb_flush_pending)) |
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return true; |
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return false; |
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} |
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/* |
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* Conversion functions: convert a page and protection to a page entry, |
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* and a page entry and page directory to the page they refer to. |
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*/ |
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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) |
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
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{ |
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return __pte((pte_val(pte) & _PAGE_CHG_MASK) | |
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(pgprot_val(newprot) & ~_PAGE_CHG_MASK)); |
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} |
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extern void __update_tlb(struct vm_area_struct *vma, |
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unsigned long address, pte_t *ptep); |
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static inline void update_mmu_cache(struct vm_area_struct *vma, |
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unsigned long address, pte_t *ptep) |
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{ |
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__update_tlb(vma, address, ptep); |
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} |
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static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, |
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unsigned long address, pmd_t *pmdp) |
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{ |
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__update_tlb(vma, address, (pte_t *)pmdp); |
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} |
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#define kern_addr_valid(addr) (1) |
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static inline unsigned long pmd_pfn(pmd_t pmd) |
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{ |
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return (pmd_val(pmd) & _PFN_MASK) >> _PFN_SHIFT; |
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} |
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
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/* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ |
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#define pmdp_establish generic_pmdp_establish |
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static inline int pmd_trans_huge(pmd_t pmd) |
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{ |
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return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd); |
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} |
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static inline pmd_t pmd_mkhuge(pmd_t pmd) |
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{ |
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pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) | |
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((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)); |
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pmd_val(pmd) |= _PAGE_HUGE; |
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return pmd; |
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} |
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#define pmd_write pmd_write |
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static inline int pmd_write(pmd_t pmd) |
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{ |
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return !!(pmd_val(pmd) & _PAGE_WRITE); |
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} |
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static inline pmd_t pmd_mkwrite(pmd_t pmd) |
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{ |
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pmd_val(pmd) |= (_PAGE_WRITE | _PAGE_DIRTY); |
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return pmd; |
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} |
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static inline pmd_t pmd_wrprotect(pmd_t pmd) |
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{ |
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pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY); |
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return pmd; |
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} |
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static inline int pmd_dirty(pmd_t pmd) |
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{ |
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return !!(pmd_val(pmd) & _PAGE_MODIFIED); |
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} |
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static inline pmd_t pmd_mkclean(pmd_t pmd) |
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{ |
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pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED); |
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return pmd; |
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} |
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static inline pmd_t pmd_mkdirty(pmd_t pmd) |
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{ |
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pmd_val(pmd) |= (_PAGE_DIRTY | _PAGE_MODIFIED); |
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return pmd; |
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} |
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static inline int pmd_young(pmd_t pmd) |
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{ |
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return !!(pmd_val(pmd) & _PAGE_ACCESSED); |
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} |
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static inline pmd_t pmd_mkold(pmd_t pmd) |
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{ |
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pmd_val(pmd) &= ~_PAGE_ACCESSED; |
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return pmd; |
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} |
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static inline pmd_t pmd_mkyoung(pmd_t pmd) |
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{ |
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pmd_val(pmd) |= _PAGE_ACCESSED; |
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return pmd; |
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} |
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static inline struct page *pmd_page(pmd_t pmd) |
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{ |
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if (pmd_trans_huge(pmd)) |
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return pfn_to_page(pmd_pfn(pmd)); |
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return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); |
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} |
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static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) |
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{ |
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pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) | |
|
(pgprot_val(newprot) & ~_HPAGE_CHG_MASK); |
|
return pmd; |
|
} |
|
|
|
static inline pmd_t pmd_mkinvalid(pmd_t pmd) |
|
{ |
|
pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE); |
|
|
|
return pmd; |
|
} |
|
|
|
/* |
|
* The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a |
|
* different prototype. |
|
*/ |
|
#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR |
|
static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, |
|
unsigned long address, pmd_t *pmdp) |
|
{ |
|
pmd_t old = *pmdp; |
|
|
|
pmd_clear(pmdp); |
|
|
|
return old; |
|
} |
|
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
|
|
#ifdef CONFIG_NUMA_BALANCING |
|
static inline long pte_protnone(pte_t pte) |
|
{ |
|
return (pte_val(pte) & _PAGE_PROTNONE); |
|
} |
|
|
|
static inline long pmd_protnone(pmd_t pmd) |
|
{ |
|
return (pmd_val(pmd) & _PAGE_PROTNONE); |
|
} |
|
#endif /* CONFIG_NUMA_BALANCING */ |
|
|
|
/* |
|
* We provide our own get_unmapped area to cope with the virtual aliasing |
|
* constraints placed on us by the cache architecture. |
|
*/ |
|
#define HAVE_ARCH_UNMAPPED_AREA |
|
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN |
|
|
|
#endif /* !__ASSEMBLY__ */ |
|
|
|
#endif /* _ASM_PGTABLE_H */
|
|
|