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323 lines
8.3 KiB
323 lines
8.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_H |
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#define _ASM_POWERPC_NOHASH_64_PGTABLE_H |
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/* |
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* This file contains the functions and defines necessary to modify and use |
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* the ppc64 non-hashed page table. |
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*/ |
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#include <linux/sizes.h> |
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#include <asm/nohash/64/pgtable-4k.h> |
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#include <asm/barrier.h> |
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#include <asm/asm-const.h> |
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/* |
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* Size of EA range mapped by our pagetables. |
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*/ |
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#define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \ |
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PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT) |
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#define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE) |
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#define PMD_CACHE_INDEX PMD_INDEX_SIZE |
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#define PUD_CACHE_INDEX PUD_INDEX_SIZE |
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/* |
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* Define the address range of the kernel non-linear virtual area |
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*/ |
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#define KERN_VIRT_START ASM_CONST(0x8000000000000000) |
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#define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000) |
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/* |
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* The vmalloc space starts at the beginning of that region, and |
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* occupies a quarter of it on Book3E |
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* (we keep a quarter for the virtual memmap) |
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*/ |
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#define VMALLOC_START KERN_VIRT_START |
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#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 2) |
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#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) |
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/* |
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* The second half of the kernel virtual space is used for IO mappings, |
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* it's itself carved into the PIO region (ISA and PHB IO space) and |
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* the ioremap space |
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* |
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* ISA_IO_BASE = KERN_IO_START, 64K reserved area |
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* PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces |
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* IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE |
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*/ |
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#define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1)) |
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#define FULL_IO_SIZE 0x80000000ul |
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#define ISA_IO_BASE (KERN_IO_START) |
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#define ISA_IO_END (KERN_IO_START + 0x10000ul) |
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#define PHB_IO_BASE (ISA_IO_END) |
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#define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE) |
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#define IOREMAP_BASE (PHB_IO_END) |
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#define IOREMAP_START (ioremap_bot) |
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#define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE - FIXADDR_SIZE) |
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#define FIXADDR_SIZE SZ_32M |
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/* |
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* Region IDs |
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*/ |
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#define REGION_SHIFT 60UL |
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#define REGION_MASK (0xfUL << REGION_SHIFT) |
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#define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT) |
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#define VMALLOC_REGION_ID (REGION_ID(VMALLOC_START)) |
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#define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET)) |
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#define USER_REGION_ID (0UL) |
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/* |
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* Defines the address of the vmemap area, in its own region on |
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* after the vmalloc space on Book3E |
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*/ |
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#define VMEMMAP_BASE VMALLOC_END |
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#define VMEMMAP_END KERN_IO_START |
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#define vmemmap ((struct page *)VMEMMAP_BASE) |
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/* |
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* Include the PTE bits definitions |
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*/ |
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#include <asm/nohash/pte-book3e.h> |
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#define _PAGE_SAO 0 |
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#define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1)) |
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/* |
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* _PAGE_CHG_MASK masks of bits that are to be preserved across |
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* pgprot changes. |
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*/ |
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#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL) |
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#define H_PAGE_4K_PFN 0 |
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#ifndef __ASSEMBLY__ |
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/* pte_clear moved to later in this file */ |
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static inline pte_t pte_mkwrite(pte_t pte) |
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{ |
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return __pte(pte_val(pte) | _PAGE_RW); |
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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 __pte(pte_val(pte) | _PAGE_DIRTY); |
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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 __pte(pte_val(pte) | _PAGE_ACCESSED); |
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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 __pte(pte_val(pte) & ~_PAGE_RW); |
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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 __pte(pte_val(pte) | _PAGE_EXEC); |
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} |
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#define PMD_BAD_BITS (PTE_TABLE_SIZE-1) |
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#define PUD_BAD_BITS (PMD_TABLE_SIZE-1) |
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static inline void pmd_set(pmd_t *pmdp, unsigned long val) |
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{ |
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*pmdp = __pmd(val); |
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} |
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static inline void pmd_clear(pmd_t *pmdp) |
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{ |
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*pmdp = __pmd(0); |
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} |
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static inline pte_t pmd_pte(pmd_t pmd) |
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{ |
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return __pte(pmd_val(pmd)); |
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} |
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#define pmd_none(pmd) (!pmd_val(pmd)) |
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#define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \ |
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|| (pmd_val(pmd) & PMD_BAD_BITS)) |
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#define pmd_present(pmd) (!pmd_none(pmd)) |
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#define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS) |
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extern struct page *pmd_page(pmd_t pmd); |
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static inline void pud_set(pud_t *pudp, unsigned long val) |
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{ |
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*pudp = __pud(val); |
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} |
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static inline void pud_clear(pud_t *pudp) |
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{ |
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*pudp = __pud(0); |
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} |
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#define pud_none(pud) (!pud_val(pud)) |
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#define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \ |
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|| (pud_val(pud) & PUD_BAD_BITS)) |
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#define pud_present(pud) (pud_val(pud) != 0) |
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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) & ~PUD_MASKED_BITS); |
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} |
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extern struct page *pud_page(pud_t pud); |
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static inline pte_t pud_pte(pud_t pud) |
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{ |
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return __pte(pud_val(pud)); |
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} |
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static inline pud_t pte_pud(pte_t pte) |
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{ |
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return __pud(pte_val(pte)); |
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} |
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#define pud_write(pud) pte_write(pud_pte(pud)) |
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#define p4d_write(pgd) pte_write(p4d_pte(p4d)) |
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static inline void p4d_set(p4d_t *p4dp, unsigned long val) |
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{ |
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*p4dp = __p4d(val); |
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} |
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/* Atomic PTE updates */ |
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static inline unsigned long pte_update(struct mm_struct *mm, |
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unsigned long addr, |
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pte_t *ptep, unsigned long clr, |
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unsigned long set, |
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int huge) |
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{ |
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unsigned long old = pte_val(*ptep); |
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*ptep = __pte((old & ~clr) | set); |
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/* huge pages use the old page table lock */ |
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if (!huge) |
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assert_pte_locked(mm, addr); |
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return old; |
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} |
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static inline int pte_young(pte_t pte) |
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{ |
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return pte_val(pte) & _PAGE_ACCESSED; |
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} |
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static inline int __ptep_test_and_clear_young(struct mm_struct *mm, |
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unsigned long addr, pte_t *ptep) |
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{ |
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unsigned long old; |
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if (pte_young(*ptep)) |
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return 0; |
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old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0); |
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return (old & _PAGE_ACCESSED) != 0; |
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} |
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#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG |
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#define ptep_test_and_clear_young(__vma, __addr, __ptep) \ |
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({ \ |
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int __r; \ |
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__r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \ |
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__r; \ |
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}) |
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#define __HAVE_ARCH_PTEP_SET_WRPROTECT |
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static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, |
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pte_t *ptep) |
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{ |
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if ((pte_val(*ptep) & _PAGE_RW) == 0) |
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return; |
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pte_update(mm, addr, ptep, _PAGE_RW, 0, 0); |
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} |
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#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT |
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static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, |
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unsigned long addr, pte_t *ptep) |
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{ |
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if ((pte_val(*ptep) & _PAGE_RW) == 0) |
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return; |
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pte_update(mm, addr, ptep, _PAGE_RW, 0, 1); |
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} |
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#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH |
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#define ptep_clear_flush_young(__vma, __address, __ptep) \ |
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({ \ |
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int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \ |
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__ptep); \ |
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__young; \ |
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}) |
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#define __HAVE_ARCH_PTEP_GET_AND_CLEAR |
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static inline pte_t ptep_get_and_clear(struct mm_struct *mm, |
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unsigned long addr, pte_t *ptep) |
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{ |
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unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0); |
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return __pte(old); |
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} |
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static inline void pte_clear(struct mm_struct *mm, unsigned long addr, |
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pte_t * ptep) |
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{ |
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pte_update(mm, addr, ptep, ~0UL, 0, 0); |
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} |
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/* Set the dirty and/or accessed bits atomically in a linux PTE */ |
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static inline void __ptep_set_access_flags(struct vm_area_struct *vma, |
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pte_t *ptep, pte_t entry, |
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unsigned long address, |
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int psize) |
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{ |
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unsigned long bits = pte_val(entry) & |
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(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC); |
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unsigned long old = pte_val(*ptep); |
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*ptep = __pte(old | bits); |
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flush_tlb_page(vma, address); |
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} |
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#define __HAVE_ARCH_PTE_SAME |
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#define pte_same(A,B) ((pte_val(A) ^ pte_val(B)) == 0) |
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#define pte_ERROR(e) \ |
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pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) |
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#define pmd_ERROR(e) \ |
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pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) |
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#define pgd_ERROR(e) \ |
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pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) |
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/* Encode and de-code a swap entry */ |
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#define MAX_SWAPFILES_CHECK() do { \ |
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BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \ |
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} while (0) |
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#define SWP_TYPE_BITS 5 |
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#define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \ |
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& ((1UL << SWP_TYPE_BITS) - 1)) |
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#define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT) |
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#define __swp_entry(type, offset) ((swp_entry_t) { \ |
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((type) << _PAGE_BIT_SWAP_TYPE) \ |
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| ((offset) << PTE_RPN_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(x) __pte((x).val) |
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int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot); |
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extern int __meminit vmemmap_create_mapping(unsigned long start, |
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unsigned long page_size, |
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unsigned long phys); |
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extern void vmemmap_remove_mapping(unsigned long start, |
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unsigned long page_size); |
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#endif /* __ASSEMBLY__ */ |
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#endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */
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