mirror of https://gitee.com/openkylin/linux.git
376 lines
10 KiB
C
376 lines
10 KiB
C
/*
|
|
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
* Copyright 2003 PathScale, Inc.
|
|
* Derived from include/asm-i386/pgtable.h
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#ifndef __UM_PGTABLE_H
|
|
#define __UM_PGTABLE_H
|
|
|
|
#include <asm/fixmap.h>
|
|
|
|
#define _PAGE_PRESENT 0x001
|
|
#define _PAGE_NEWPAGE 0x002
|
|
#define _PAGE_NEWPROT 0x004
|
|
#define _PAGE_RW 0x020
|
|
#define _PAGE_USER 0x040
|
|
#define _PAGE_ACCESSED 0x080
|
|
#define _PAGE_DIRTY 0x100
|
|
/* If _PAGE_PRESENT is clear, we use these: */
|
|
#define _PAGE_FILE 0x008 /* nonlinear file mapping, saved PTE; unset:swap */
|
|
#define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE;
|
|
pte_present gives true */
|
|
|
|
#ifdef CONFIG_3_LEVEL_PGTABLES
|
|
#include <asm/pgtable-3level.h>
|
|
#else
|
|
#include <asm/pgtable-2level.h>
|
|
#endif
|
|
|
|
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
|
|
|
|
/* zero page used for uninitialized stuff */
|
|
extern unsigned long *empty_zero_page;
|
|
|
|
#define pgtable_cache_init() do ; while (0)
|
|
|
|
/* Just any arbitrary offset to the start of the vmalloc VM area: the
|
|
* current 8MB value just means that there will be a 8MB "hole" after the
|
|
* physical memory until the kernel virtual memory starts. That means that
|
|
* any out-of-bounds memory accesses will hopefully be caught.
|
|
* The vmalloc() routines leaves a hole of 4kB between each vmalloced
|
|
* area for the same reason. ;)
|
|
*/
|
|
|
|
extern unsigned long end_iomem;
|
|
|
|
#define VMALLOC_OFFSET (__va_space)
|
|
#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
|
|
#define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK)
|
|
#ifdef CONFIG_HIGHMEM
|
|
# define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE)
|
|
#else
|
|
# define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
|
|
#endif
|
|
#define MODULES_VADDR VMALLOC_START
|
|
#define MODULES_END VMALLOC_END
|
|
#define MODULES_LEN (MODULES_VADDR - MODULES_END)
|
|
|
|
#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
|
|
#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
|
|
#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
|
|
#define __PAGE_KERNEL_EXEC \
|
|
(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
|
|
#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
|
|
#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
|
|
#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
|
|
#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
|
|
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
|
|
#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
|
|
|
|
/*
|
|
* The i386 can't do page protection for execute, and considers that the same
|
|
* are read.
|
|
* Also, write permissions imply read permissions. This is the closest we can
|
|
* get..
|
|
*/
|
|
#define __P000 PAGE_NONE
|
|
#define __P001 PAGE_READONLY
|
|
#define __P010 PAGE_COPY
|
|
#define __P011 PAGE_COPY
|
|
#define __P100 PAGE_READONLY
|
|
#define __P101 PAGE_READONLY
|
|
#define __P110 PAGE_COPY
|
|
#define __P111 PAGE_COPY
|
|
|
|
#define __S000 PAGE_NONE
|
|
#define __S001 PAGE_READONLY
|
|
#define __S010 PAGE_SHARED
|
|
#define __S011 PAGE_SHARED
|
|
#define __S100 PAGE_READONLY
|
|
#define __S101 PAGE_READONLY
|
|
#define __S110 PAGE_SHARED
|
|
#define __S111 PAGE_SHARED
|
|
|
|
/*
|
|
* ZERO_PAGE is a global shared page that is always zero: used
|
|
* for zero-mapped memory areas etc..
|
|
*/
|
|
#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
|
|
|
|
#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))
|
|
|
|
#define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))
|
|
#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
|
|
|
|
#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
|
|
#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
|
|
|
|
#define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE)
|
|
#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
|
|
|
|
#define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE)
|
|
#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)
|
|
|
|
#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
|
|
|
|
#define pte_page(x) pfn_to_page(pte_pfn(x))
|
|
|
|
#define pte_present(x) pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE))
|
|
|
|
/*
|
|
* =================================
|
|
* Flags checking section.
|
|
* =================================
|
|
*/
|
|
|
|
static inline int pte_none(pte_t pte)
|
|
{
|
|
return pte_is_zero(pte);
|
|
}
|
|
|
|
/*
|
|
* The following only work if pte_present() is true.
|
|
* Undefined behaviour if not..
|
|
*/
|
|
static inline int pte_read(pte_t pte)
|
|
{
|
|
return((pte_get_bits(pte, _PAGE_USER)) &&
|
|
!(pte_get_bits(pte, _PAGE_PROTNONE)));
|
|
}
|
|
|
|
static inline int pte_exec(pte_t pte){
|
|
return((pte_get_bits(pte, _PAGE_USER)) &&
|
|
!(pte_get_bits(pte, _PAGE_PROTNONE)));
|
|
}
|
|
|
|
static inline int pte_write(pte_t pte)
|
|
{
|
|
return((pte_get_bits(pte, _PAGE_RW)) &&
|
|
!(pte_get_bits(pte, _PAGE_PROTNONE)));
|
|
}
|
|
|
|
/*
|
|
* The following only works if pte_present() is not true.
|
|
*/
|
|
static inline int pte_file(pte_t pte)
|
|
{
|
|
return pte_get_bits(pte, _PAGE_FILE);
|
|
}
|
|
|
|
static inline int pte_dirty(pte_t pte)
|
|
{
|
|
return pte_get_bits(pte, _PAGE_DIRTY);
|
|
}
|
|
|
|
static inline int pte_young(pte_t pte)
|
|
{
|
|
return pte_get_bits(pte, _PAGE_ACCESSED);
|
|
}
|
|
|
|
static inline int pte_newpage(pte_t pte)
|
|
{
|
|
return pte_get_bits(pte, _PAGE_NEWPAGE);
|
|
}
|
|
|
|
static inline int pte_newprot(pte_t pte)
|
|
{
|
|
return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
|
|
}
|
|
|
|
static inline int pte_special(pte_t pte)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* =================================
|
|
* Flags setting section.
|
|
* =================================
|
|
*/
|
|
|
|
static inline pte_t pte_mknewprot(pte_t pte)
|
|
{
|
|
pte_set_bits(pte, _PAGE_NEWPROT);
|
|
return(pte);
|
|
}
|
|
|
|
static inline pte_t pte_mkclean(pte_t pte)
|
|
{
|
|
pte_clear_bits(pte, _PAGE_DIRTY);
|
|
return(pte);
|
|
}
|
|
|
|
static inline pte_t pte_mkold(pte_t pte)
|
|
{
|
|
pte_clear_bits(pte, _PAGE_ACCESSED);
|
|
return(pte);
|
|
}
|
|
|
|
static inline pte_t pte_wrprotect(pte_t pte)
|
|
{
|
|
pte_clear_bits(pte, _PAGE_RW);
|
|
return(pte_mknewprot(pte));
|
|
}
|
|
|
|
static inline pte_t pte_mkread(pte_t pte)
|
|
{
|
|
pte_set_bits(pte, _PAGE_USER);
|
|
return(pte_mknewprot(pte));
|
|
}
|
|
|
|
static inline pte_t pte_mkdirty(pte_t pte)
|
|
{
|
|
pte_set_bits(pte, _PAGE_DIRTY);
|
|
return(pte);
|
|
}
|
|
|
|
static inline pte_t pte_mkyoung(pte_t pte)
|
|
{
|
|
pte_set_bits(pte, _PAGE_ACCESSED);
|
|
return(pte);
|
|
}
|
|
|
|
static inline pte_t pte_mkwrite(pte_t pte)
|
|
{
|
|
pte_set_bits(pte, _PAGE_RW);
|
|
return(pte_mknewprot(pte));
|
|
}
|
|
|
|
static inline pte_t pte_mkuptodate(pte_t pte)
|
|
{
|
|
pte_clear_bits(pte, _PAGE_NEWPAGE);
|
|
if(pte_present(pte))
|
|
pte_clear_bits(pte, _PAGE_NEWPROT);
|
|
return(pte);
|
|
}
|
|
|
|
static inline pte_t pte_mknewpage(pte_t pte)
|
|
{
|
|
pte_set_bits(pte, _PAGE_NEWPAGE);
|
|
return(pte);
|
|
}
|
|
|
|
static inline pte_t pte_mkspecial(pte_t pte)
|
|
{
|
|
return(pte);
|
|
}
|
|
|
|
static inline void set_pte(pte_t *pteptr, pte_t pteval)
|
|
{
|
|
pte_copy(*pteptr, pteval);
|
|
|
|
/* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
|
|
* fix_range knows to unmap it. _PAGE_NEWPROT is specific to
|
|
* mapped pages.
|
|
*/
|
|
|
|
*pteptr = pte_mknewpage(*pteptr);
|
|
if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
|
|
}
|
|
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
|
|
|
|
#define __HAVE_ARCH_PTE_SAME
|
|
static inline int pte_same(pte_t pte_a, pte_t pte_b)
|
|
{
|
|
return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE);
|
|
}
|
|
|
|
/*
|
|
* Conversion functions: convert a page and protection to a page entry,
|
|
* and a page entry and page directory to the page they refer to.
|
|
*/
|
|
|
|
#define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
|
|
#define __virt_to_page(virt) phys_to_page(__pa(virt))
|
|
#define page_to_phys(page) pfn_to_phys((pfn_t) page_to_pfn(page))
|
|
#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
|
|
|
|
#define mk_pte(page, pgprot) \
|
|
({ pte_t pte; \
|
|
\
|
|
pte_set_val(pte, page_to_phys(page), (pgprot)); \
|
|
if (pte_present(pte)) \
|
|
pte_mknewprot(pte_mknewpage(pte)); \
|
|
pte;})
|
|
|
|
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
|
|
{
|
|
pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);
|
|
return pte;
|
|
}
|
|
|
|
/*
|
|
* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
|
|
*
|
|
* this macro returns the index of the entry in the pgd page which would
|
|
* control the given virtual address
|
|
*/
|
|
#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
|
|
|
|
/*
|
|
* pgd_offset() returns a (pgd_t *)
|
|
* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
|
|
*/
|
|
#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
|
|
|
|
/*
|
|
* a shortcut which implies the use of the kernel's pgd, instead
|
|
* of a process's
|
|
*/
|
|
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
|
|
|
|
/*
|
|
* the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
|
|
*
|
|
* this macro returns the index of the entry in the pmd page which would
|
|
* control the given virtual address
|
|
*/
|
|
#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
|
|
#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
|
|
|
|
#define pmd_page_vaddr(pmd) \
|
|
((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
|
|
|
|
/*
|
|
* the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
|
|
*
|
|
* this macro returns the index of the entry in the pte page which would
|
|
* control the given virtual address
|
|
*/
|
|
#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
|
|
#define pte_offset_kernel(dir, address) \
|
|
((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
|
|
#define pte_offset_map(dir, address) \
|
|
((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
|
|
#define pte_unmap(pte) do { } while (0)
|
|
|
|
struct mm_struct;
|
|
extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
|
|
|
|
#define update_mmu_cache(vma,address,ptep) do ; while (0)
|
|
|
|
/* Encode and de-code a swap entry */
|
|
#define __swp_type(x) (((x).val >> 5) & 0x1f)
|
|
#define __swp_offset(x) ((x).val >> 11)
|
|
|
|
#define __swp_entry(type, offset) \
|
|
((swp_entry_t) { ((type) << 5) | ((offset) << 11) })
|
|
#define __pte_to_swp_entry(pte) \
|
|
((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
|
|
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
|
|
|
|
#define kern_addr_valid(addr) (1)
|
|
|
|
#include <asm-generic/pgtable.h>
|
|
|
|
/* Clear a kernel PTE and flush it from the TLB */
|
|
#define kpte_clear_flush(ptep, vaddr) \
|
|
do { \
|
|
pte_clear(&init_mm, (vaddr), (ptep)); \
|
|
__flush_tlb_one((vaddr)); \
|
|
} while (0)
|
|
|
|
#endif
|