ca140fdadb
Join together some common functions (pmd_page{,_kernel}) over 2level and
3level pages.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
#ifndef _I386_PGTABLE_2LEVEL_H
|
|
#define _I386_PGTABLE_2LEVEL_H
|
|
|
|
#include <asm-generic/pgtable-nopmd.h>
|
|
|
|
#define pte_ERROR(e) \
|
|
printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
|
|
#define pgd_ERROR(e) \
|
|
printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
|
|
|
|
/*
|
|
* Certain architectures need to do special things when PTEs
|
|
* within a page table are directly modified. Thus, the following
|
|
* hook is made available.
|
|
*/
|
|
#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
|
|
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
|
|
#define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
|
|
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
|
|
|
|
#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte_low, 0))
|
|
#define pte_same(a, b) ((a).pte_low == (b).pte_low)
|
|
#define pte_page(x) pfn_to_page(pte_pfn(x))
|
|
#define pte_none(x) (!(x).pte_low)
|
|
#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
|
|
#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
|
|
#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
|
|
|
|
/*
|
|
* All present user pages are user-executable:
|
|
*/
|
|
static inline int pte_exec(pte_t pte)
|
|
{
|
|
return pte_user(pte);
|
|
}
|
|
|
|
/*
|
|
* All present pages are kernel-executable:
|
|
*/
|
|
static inline int pte_exec_kernel(pte_t pte)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Bits 0, 6 and 7 are taken, split up the 29 bits of offset
|
|
* into this range:
|
|
*/
|
|
#define PTE_FILE_MAX_BITS 29
|
|
|
|
#define pte_to_pgoff(pte) \
|
|
((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 ))
|
|
|
|
#define pgoff_to_pte(off) \
|
|
((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE })
|
|
|
|
/* Encode and de-code a swap entry */
|
|
#define __swp_type(x) (((x).val >> 1) & 0x1f)
|
|
#define __swp_offset(x) ((x).val >> 8)
|
|
#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
|
|
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
|
|
|
|
#endif /* _I386_PGTABLE_2LEVEL_H */
|