27ec161f93
It only has a single use, which can be trivially replaced. Signed-off-by: Jeremy Fitzhardinge <Jeremy.Fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
436 lines
15 KiB
C
436 lines
15 KiB
C
#ifndef _X86_64_PGTABLE_H
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#define _X86_64_PGTABLE_H
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#include <linux/const.h>
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#ifndef __ASSEMBLY__
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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 x86-64 page table tree.
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*/
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#include <asm/processor.h>
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#include <linux/bitops.h>
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#include <linux/threads.h>
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#include <asm/pda.h>
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extern pud_t level3_kernel_pgt[512];
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extern pud_t level3_ident_pgt[512];
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extern pmd_t level2_kernel_pgt[512];
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extern pgd_t init_level4_pgt[];
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extern unsigned long __supported_pte_mask;
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#define swapper_pg_dir init_level4_pgt
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extern void paging_init(void);
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extern void clear_kernel_mapping(unsigned long addr, unsigned long size);
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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[PAGE_SIZE/sizeof(unsigned long)];
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#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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#endif /* !__ASSEMBLY__ */
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/*
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* PGDIR_SHIFT determines what a top-level page table entry can map
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*/
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#define PGDIR_SHIFT 39
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#define PTRS_PER_PGD 512
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/*
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* 3rd level page
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*/
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#define PUD_SHIFT 30
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#define PTRS_PER_PUD 512
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/*
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* PMD_SHIFT determines the size of the area a middle-level
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* page table can map
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*/
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#define PMD_SHIFT 21
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#define PTRS_PER_PMD 512
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/*
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* entries per page directory level
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*/
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#define PTRS_PER_PTE 512
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#ifndef __ASSEMBLY__
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
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#define pmd_ERROR(e) \
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printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
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#define pud_ERROR(e) \
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printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e))
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
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#define pgd_none(x) (!pgd_val(x))
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#define pud_none(x) (!pud_val(x))
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static inline void set_pte(pte_t *dst, pte_t val)
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{
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pte_val(*dst) = pte_val(val);
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}
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#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
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static inline void set_pmd(pmd_t *dst, pmd_t val)
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{
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pmd_val(*dst) = pmd_val(val);
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}
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static inline void set_pud(pud_t *dst, pud_t val)
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{
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pud_val(*dst) = pud_val(val);
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}
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static inline void pud_clear (pud_t *pud)
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{
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set_pud(pud, __pud(0));
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}
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static inline void set_pgd(pgd_t *dst, pgd_t val)
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{
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pgd_val(*dst) = pgd_val(val);
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}
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static inline void pgd_clear (pgd_t * pgd)
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{
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set_pgd(pgd, __pgd(0));
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}
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#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte, 0))
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struct mm_struct;
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static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full)
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{
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pte_t pte;
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if (full) {
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pte = *ptep;
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*ptep = __pte(0);
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} else {
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pte = ptep_get_and_clear(mm, addr, ptep);
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}
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return pte;
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}
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#define pte_same(a, b) ((a).pte == (b).pte)
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#define pte_pgprot(a) (__pgprot((a).pte & ~PHYSICAL_PAGE_MASK))
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#endif /* !__ASSEMBLY__ */
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#define PMD_SIZE (_AC(1,UL) << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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#define PUD_SIZE (_AC(1,UL) << PUD_SHIFT)
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#define PUD_MASK (~(PUD_SIZE-1))
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#define PGDIR_SIZE (_AC(1,UL) << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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#define USER_PTRS_PER_PGD ((TASK_SIZE-1)/PGDIR_SIZE+1)
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#define FIRST_USER_ADDRESS 0
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#define MAXMEM _AC(0x3fffffffffff, UL)
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#define VMALLOC_START _AC(0xffffc20000000000, UL)
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#define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
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#define VMEMMAP_START _AC(0xffffe20000000000, UL)
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#define MODULES_VADDR _AC(0xffffffff88000000, UL)
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#define MODULES_END _AC(0xfffffffffff00000, UL)
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#define MODULES_LEN (MODULES_END - MODULES_VADDR)
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#define _PAGE_BIT_PRESENT 0
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#define _PAGE_BIT_RW 1
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#define _PAGE_BIT_USER 2
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#define _PAGE_BIT_PWT 3
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#define _PAGE_BIT_PCD 4
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#define _PAGE_BIT_ACCESSED 5
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#define _PAGE_BIT_DIRTY 6
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#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
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#define _PAGE_BIT_FILE 6
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#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
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#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
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#define _PAGE_PRESENT (_AC(1, UL)<<_PAGE_BIT_PRESENT)
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#define _PAGE_RW (_AC(1, UL)<<_PAGE_BIT_RW)
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#define _PAGE_USER (_AC(1, UL)<<_PAGE_BIT_USER)
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#define _PAGE_PWT (_AC(1, UL)<<_PAGE_BIT_PWT)
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#define _PAGE_PCD (_AC(1, UL)<<_PAGE_BIT_PCD)
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#define _PAGE_ACCESSED (_AC(1, UL)<<_PAGE_BIT_ACCESSED)
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#define _PAGE_DIRTY (_AC(1, UL)<<_PAGE_BIT_DIRTY)
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/* 2MB page */
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#define _PAGE_PSE (_AC(1, UL)<<_PAGE_BIT_PSE)
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/* nonlinear file mapping, saved PTE; unset:swap */
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#define _PAGE_FILE (_AC(1, UL)<<_PAGE_BIT_FILE)
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/* Global TLB entry */
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#define _PAGE_GLOBAL (_AC(1, UL)<<_PAGE_BIT_GLOBAL)
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#define _PAGE_PROTNONE 0x080 /* If not present */
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#define _PAGE_NX (_AC(1, UL)<<_PAGE_BIT_NX)
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#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_COPY PAGE_COPY_NOEXEC
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#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
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#define __PAGE_KERNEL \
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(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
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#define __PAGE_KERNEL_EXEC \
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(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
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#define __PAGE_KERNEL_NOCACHE \
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(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED | _PAGE_NX)
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#define __PAGE_KERNEL_RO \
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(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
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#define __PAGE_KERNEL_VSYSCALL \
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(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
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#define __PAGE_KERNEL_VSYSCALL_NOCACHE \
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(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_PCD)
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#define __PAGE_KERNEL_LARGE \
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(__PAGE_KERNEL | _PAGE_PSE)
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#define __PAGE_KERNEL_LARGE_EXEC \
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(__PAGE_KERNEL_EXEC | _PAGE_PSE)
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#define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
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#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
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#define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
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#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
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#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
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#define PAGE_KERNEL_VSYSCALL32 __pgprot(__PAGE_KERNEL_VSYSCALL)
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#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
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#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
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#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
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/* xwr */
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#define __P000 PAGE_NONE
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#define __P001 PAGE_READONLY
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#define __P010 PAGE_COPY
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#define __P011 PAGE_COPY
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#define __P100 PAGE_READONLY_EXEC
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#define __P101 PAGE_READONLY_EXEC
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#define __P110 PAGE_COPY_EXEC
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#define __P111 PAGE_COPY_EXEC
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#define __S000 PAGE_NONE
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#define __S001 PAGE_READONLY
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#define __S010 PAGE_SHARED
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#define __S011 PAGE_SHARED
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#define __S100 PAGE_READONLY_EXEC
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#define __S101 PAGE_READONLY_EXEC
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#define __S110 PAGE_SHARED_EXEC
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#define __S111 PAGE_SHARED_EXEC
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#ifndef __ASSEMBLY__
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static inline unsigned long pgd_bad(pgd_t pgd)
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{
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return pgd_val(pgd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
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}
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static inline unsigned long pud_bad(pud_t pud)
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{
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return pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
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}
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static inline unsigned long pmd_bad(pmd_t pmd)
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{
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return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
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}
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#define pte_none(x) (!pte_val(x))
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#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
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#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
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#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this right? */
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define pte_pfn(x) ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
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static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
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{
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pte_t pte;
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pte_val(pte) = (page_nr << PAGE_SHIFT);
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pte_val(pte) |= pgprot_val(pgprot);
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pte_val(pte) &= __supported_pte_mask;
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return pte;
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}
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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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#define __LARGE_PTE (_PAGE_PSE|_PAGE_PRESENT)
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static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
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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_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
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static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
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static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_PSE; }
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static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
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static inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
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static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
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static inline pte_t pte_mkexec(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_NX)); return pte; }
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static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
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static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
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static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
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static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_PSE)); return pte; }
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static inline pte_t pte_clrhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_PSE)); return pte; }
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struct vm_area_struct;
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static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
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{
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if (!pte_young(*ptep))
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return 0;
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return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
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}
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static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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{
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clear_bit(_PAGE_BIT_RW, &ptep->pte);
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}
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/*
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* Macro to mark a page protection value as "uncacheable".
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*/
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#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT))
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static inline int pmd_large(pmd_t pte) {
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return (pmd_val(pte) & __LARGE_PTE) == __LARGE_PTE;
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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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/*
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* Level 4 access.
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*/
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#define pgd_page_vaddr(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
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#define pgd_page(pgd) (pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT))
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#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
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#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
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#define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
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#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
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#define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
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/* PUD - Level3 access */
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/* to find an entry in a page-table-directory. */
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#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
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#define pud_page(pud) (pfn_to_page(pud_val(pud) >> PAGE_SHIFT))
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#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
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#define pud_offset(pgd, address) ((pud_t *) pgd_page_vaddr(*(pgd)) + pud_index(address))
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#define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
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/* PMD - Level 2 access */
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#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
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#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
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#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
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#define pmd_offset(dir, address) ((pmd_t *) pud_page_vaddr(*(dir)) + \
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pmd_index(address))
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#define pmd_none(x) (!pmd_val(x))
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#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
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#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
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#define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
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#define pmd_pfn(x) ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
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#define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
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#define pgoff_to_pte(off) ((pte_t) { ((off) << PAGE_SHIFT) | _PAGE_FILE })
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#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
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/* PTE - Level 1 access. */
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/* page, protection -> pte */
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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
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/* Change flags of a PTE */
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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pte_val(pte) &= _PAGE_CHG_MASK;
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pte_val(pte) |= pgprot_val(newprot);
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pte_val(pte) &= __supported_pte_mask;
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return pte;
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}
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#define pte_index(address) \
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(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
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#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
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pte_index(address))
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/* x86-64 always has all page tables mapped. */
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#define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
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#define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
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#define pte_unmap(pte) /* NOP */
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#define pte_unmap_nested(pte) /* NOP */
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#define update_mmu_cache(vma,address,pte) do { } while (0)
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/* We only update the dirty/accessed state if we set
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* the dirty bit by hand in the kernel, since the hardware
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* will do the accessed bit for us, and we don't want to
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* race with other CPU's that might be updating the dirty
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* bit at the same time. */
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#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
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#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
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({ \
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int __changed = !pte_same(*(__ptep), __entry); \
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if (__changed && __dirty) { \
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set_pte(__ptep, __entry); \
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flush_tlb_page(__vma, __address); \
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} \
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__changed; \
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})
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/* Encode and de-code a swap entry */
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#define __swp_type(x) (((x).val >> 1) & 0x3f)
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#define __swp_offset(x) ((x).val >> 8)
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#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
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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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|
|
|
extern spinlock_t pgd_lock;
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|
extern struct list_head pgd_list;
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|
|
|
extern int kern_addr_valid(unsigned long addr);
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|
|
|
pte_t *lookup_address(unsigned long addr);
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|
|
|
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
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|
remap_pfn_range(vma, vaddr, pfn, size, prot)
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|
|
|
#define HAVE_ARCH_UNMAPPED_AREA
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|
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
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|
|
|
#define pgtable_cache_init() do { } while (0)
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|
#define check_pgt_cache() do { } while (0)
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|
|
|
#define PAGE_AGP PAGE_KERNEL_NOCACHE
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|
#define HAVE_PAGE_AGP 1
|
|
|
|
/* fs/proc/kcore.c */
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|
#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
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|
#define kc_offset_to_vaddr(o) \
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|
(((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
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|
|
|
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
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|
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
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|
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
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|
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
|
|
#define __HAVE_ARCH_PTE_SAME
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|
#include <asm-generic/pgtable.h>
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|
#endif /* !__ASSEMBLY__ */
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|
|
|
#endif /* _X86_64_PGTABLE_H */
|