mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 21:54:11 +08:00
46a82b2d55
One of the changes necessary for shared page tables is to standardize the pxx_page macros. pte_page and pmd_page have always returned the struct page associated with their entry, while pte_page_kernel and pmd_page_kernel have returned the kernel virtual address. pud_page and pgd_page, on the other hand, return the kernel virtual address. Shared page tables needs pud_page and pgd_page to return the actual page structures. There are very few actual users of these functions, so it is simple to standardize their usage. Since this is basic cleanup, I am submitting these changes as a standalone patch. Per Hugh Dickins' comments about it, I am also changing the pxx_page_kernel macros to pxx_page_vaddr to clarify their meaning. Signed-off-by: Dave McCracken <dmccr@us.ibm.com> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
/*
|
|
* Copyright 2003 PathScale Inc
|
|
* Derived from include/asm-i386/pgtable.h
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#ifndef __UM_PGTABLE_3LEVEL_H
|
|
#define __UM_PGTABLE_3LEVEL_H
|
|
|
|
#include <asm-generic/pgtable-nopud.h>
|
|
|
|
/* PGDIR_SHIFT determines what a third-level page table entry can map */
|
|
|
|
#define PGDIR_SHIFT 30
|
|
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
|
|
#define PGDIR_MASK (~(PGDIR_SIZE-1))
|
|
|
|
/* PMD_SHIFT determines the size of the area a second-level page table can
|
|
* map
|
|
*/
|
|
|
|
#define PMD_SHIFT 21
|
|
#define PMD_SIZE (1UL << PMD_SHIFT)
|
|
#define PMD_MASK (~(PMD_SIZE-1))
|
|
|
|
/*
|
|
* entries per page directory level
|
|
*/
|
|
|
|
#define PTRS_PER_PTE 512
|
|
#define PTRS_PER_PMD 512
|
|
#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
|
|
#define PTRS_PER_PGD 512
|
|
#define FIRST_USER_ADDRESS 0
|
|
|
|
#define pte_ERROR(e) \
|
|
printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
|
|
pte_val(e))
|
|
#define pmd_ERROR(e) \
|
|
printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
|
|
pmd_val(e))
|
|
#define pgd_ERROR(e) \
|
|
printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
|
|
pgd_val(e))
|
|
|
|
#define pud_none(x) (!(pud_val(x) & ~_PAGE_NEWPAGE))
|
|
#define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
|
|
#define pud_present(x) (pud_val(x) & _PAGE_PRESENT)
|
|
#define pud_populate(mm, pud, pmd) \
|
|
set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
|
|
|
|
#define set_pud(pudptr, pudval) set_64bit((phys_t *) (pudptr), pud_val(pudval))
|
|
static inline int pgd_newpage(pgd_t pgd)
|
|
{
|
|
return(pgd_val(pgd) & _PAGE_NEWPAGE);
|
|
}
|
|
|
|
static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
|
|
|
|
#define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval))
|
|
|
|
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
|
|
{
|
|
pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL);
|
|
|
|
if(pmd)
|
|
memset(pmd, 0, PAGE_SIZE);
|
|
|
|
return pmd;
|
|
}
|
|
|
|
extern inline void pud_clear (pud_t *pud)
|
|
{
|
|
set_pud(pud, __pud(0));
|
|
}
|
|
|
|
#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
|
|
#define pud_page_vaddr(pud) \
|
|
((struct page *) __va(pud_val(pud) & PAGE_MASK))
|
|
|
|
/* Find an entry in the second-level page table.. */
|
|
#define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \
|
|
pmd_index(address))
|
|
|
|
static inline unsigned long pte_pfn(pte_t pte)
|
|
{
|
|
return phys_to_pfn(pte_val(pte));
|
|
}
|
|
|
|
static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
|
|
{
|
|
pte_t pte;
|
|
phys_t phys = pfn_to_phys(page_nr);
|
|
|
|
pte_set_val(pte, phys, pgprot);
|
|
return pte;
|
|
}
|
|
|
|
static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot)
|
|
{
|
|
return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
|
|
}
|
|
|
|
/*
|
|
* Bits 0 through 3 are taken in the low part of the pte,
|
|
* put the 32 bits of offset into the high part.
|
|
*/
|
|
#define PTE_FILE_MAX_BITS 32
|
|
|
|
#ifdef CONFIG_64BIT
|
|
|
|
#define pte_to_pgoff(p) ((p).pte >> 32)
|
|
|
|
#define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE })
|
|
|
|
#else
|
|
|
|
#define pte_to_pgoff(pte) ((pte).pte_high)
|
|
|
|
#define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
|
* Emacs will notice this stuff at the end of the file and automatically
|
|
* adjust the settings for this buffer only. This must remain at the end
|
|
* of the file.
|
|
* ---------------------------------------------------------------------------
|
|
* Local variables:
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|