LXR linux/arch/blackfin/include/asm/pgtable.h

   1/*
   2 * Copyright 2004-2009 Analog Devices Inc.
   3 *
   4 * Licensed under the GPL-2 or later.
   5 */
   6
   7#ifndef _BLACKFIN_PGTABLE_H
   8#define _BLACKFIN_PGTABLE_H
   9
  10#include <asm-generic/4level-fixup.h>
  11
  12#include <asm/page.h>
  13#include <asm/def_LPBlackfin.h>
  14
  15typedef pte_t *pte_addr_t;
  16/*
  17* Trivial page table functions.
  18*/
  19#define pgd_present(pgd)        (1)
  20#define pgd_none(pgd)           (0)
  21#define pgd_bad(pgd)            (0)
  22#define pgd_clear(pgdp)
  23#define kern_addr_valid(addr)   (1)
  24
  25#define pmd_offset(a, b)        ((void *)0)
  26#define pmd_none(x)             (!pmd_val(x))
  27#define pmd_present(x)          (pmd_val(x))
  28#define pmd_clear(xp)           do { set_pmd(xp, __pmd(0)); } while (0)
  29#define pmd_bad(x)              (pmd_val(x) & ~PAGE_MASK)
  30
  31#define kern_addr_valid(addr) (1)
  32
  33#define PAGE_NONE               __pgprot(0)     /* these mean nothing to NO_MM */
  34#define PAGE_SHARED             __pgprot(0)     /* these mean nothing to NO_MM */
  35#define PAGE_COPY               __pgprot(0)     /* these mean nothing to NO_MM */
  36#define PAGE_READONLY           __pgprot(0)     /* these mean nothing to NO_MM */
  37#define PAGE_KERNEL             __pgprot(0)     /* these mean nothing to NO_MM */
  38#define pgprot_noncached(prot)  (prot)
  39
  40extern void paging_init(void);
  41
  42#define __swp_type(x)           (0)
  43#define __swp_offset(x)         (0)
  44#define __swp_entry(typ,off)    ((swp_entry_t) { ((typ) | ((off) << 7)) })
  45#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  46#define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  47
  48static inline int pte_file(pte_t pte)
  49{
  50        return 0;
  51}
  52
  53#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  54#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
  55
  56/*
  57 * Page assess control based on Blackfin CPLB management
  58 */
  59#define _PAGE_RD        (CPLB_USER_RD)
  60#define _PAGE_WR        (CPLB_USER_WR)
  61#define _PAGE_USER      (CPLB_USER_RD | CPLB_USER_WR)
  62#define _PAGE_ACCESSED  CPLB_ALL_ACCESS
  63#define _PAGE_DIRTY     (CPLB_DIRTY)
  64
  65#define PTE_BIT_FUNC(fn, op) \
  66        static inline pte_t pte_##fn(pte_t _pte) { _pte.pte op; return _pte; }
  67
  68PTE_BIT_FUNC(rdprotect, &= ~_PAGE_RD);
  69PTE_BIT_FUNC(mkread, |= _PAGE_RD);
  70PTE_BIT_FUNC(wrprotect, &= ~_PAGE_WR);
  71PTE_BIT_FUNC(mkwrite, |= _PAGE_WR);
  72PTE_BIT_FUNC(exprotect, &= ~_PAGE_USER);
  73PTE_BIT_FUNC(mkexec, |= _PAGE_USER);
  74PTE_BIT_FUNC(mkclean, &= ~_PAGE_DIRTY);
  75PTE_BIT_FUNC(mkdirty, |= _PAGE_DIRTY);
  76PTE_BIT_FUNC(mkold, &= ~_PAGE_ACCESSED);
  77PTE_BIT_FUNC(mkyoung, |= _PAGE_ACCESSED);
  78
  79/*
  80 * ZERO_PAGE is a global shared page that is always zero: used
  81 * for zero-mapped memory areas etc..
  82 */
  83#define ZERO_PAGE(vaddr)        virt_to_page(empty_zero_page)
  84extern char empty_zero_page[];
  85
  86#define swapper_pg_dir ((pgd_t *) 0)
  87/*
  88 * No page table caches to initialise.
  89 */
  90#define pgtable_cache_init()    do { } while (0)
  91
  92/*
  93 * All 32bit addresses are effectively valid for vmalloc...
  94 * Sort of meaningless for non-VM targets.
  95 */
  96#define VMALLOC_START   0
  97#define VMALLOC_END     0xffffffff
  98
  99/* provide a special get_unmapped_area for framebuffer mmaps of nommu */
 100extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
 101                                          unsigned long, unsigned long,
 102                                          unsigned long);
 103#define HAVE_ARCH_FB_UNMAPPED_AREA
 104
 105#include <asm-generic/pgtable.h>
 106
 107#endif                          /* _BLACKFIN_PGTABLE_H */
 108