arch/um/include/asm/pgtable-2level.h

   1 /*
   2  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
   3  * Copyright 2003 PathScale, Inc.
   4  * Derived from include/asm-i386/pgtable.h
   5  * Licensed under the GPL
   6  */
   7
   8 #ifndef __UM_PGTABLE_2LEVEL_H
   9 #define __UM_PGTABLE_2LEVEL_H
  10
  11 #include <asm-generic/pgtable-nopmd.h>
  12
  13 /* PGDIR_SHIFT determines what a third-level page table entry can map */
  14
  15 #define PGDIR_SHIFT     22
  16 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  17 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  18
  19 /*
  20  * entries per page directory level: the i386 is two-level, so
  21  * we don't really have any PMD directory physically.
  22  */
  23 #define PTRS_PER_PTE    1024
  24 #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
  25 #define PTRS_PER_PGD    1024
  26 #define FIRST_USER_ADDRESS      0
  27
  28 #define pte_ERROR(e) \
  29         printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \
  30                pte_val(e))
  31 #define pgd_ERROR(e) \
  32         printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
  33                pgd_val(e))
  34
  35 static inline int pgd_newpage(pgd_t pgd)        { return 0; }
  36 static inline void pgd_mkuptodate(pgd_t pgd)    { }
  37
  38 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  39
  40 #define pte_pfn(x) phys_to_pfn(pte_val(x))
  41 #define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))
  42 #define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot))
  43
  44 /*
  45  * Bits 0 through 4 are taken
  46  */
  47 #define PTE_FILE_MAX_BITS       27
  48
  49 #define pte_to_pgoff(pte) (pte_val(pte) >> 5)
  50
  51 #define pgoff_to_pte(off) ((pte_t) { ((off) << 5) + _PAGE_FILE })
  52
  53 #endif