LXR linux/arch/c6x/include/asm/pgtable.h

   1/*
   2 *  Port on Texas Instruments TMS320C6x architecture
   3 *
   4 *  Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
   5 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   6 *
   7 *  This program is free software; you can redistribute it and/or modify
   8 *  it under the terms of the GNU General Public License version 2 as
   9 *  published by the Free Software Foundation.
  10 */
  11#ifndef _ASM_C6X_PGTABLE_H
  12#define _ASM_C6X_PGTABLE_H
  13
  14#include <asm-generic/4level-fixup.h>
  15
  16#include <asm/setup.h>
  17#include <asm/page.h>
  18
  19/*
  20 * All 32bit addresses are effectively valid for vmalloc...
  21 * Sort of meaningless for non-VM targets.
  22 */
  23#define VMALLOC_START   0
  24#define VMALLOC_END     0xffffffff
  25
  26#define pgd_present(pgd)        (1)
  27#define pgd_none(pgd)           (0)
  28#define pgd_bad(pgd)            (0)
  29#define pgd_clear(pgdp)
  30#define kern_addr_valid(addr) (1)
  31
  32#define pmd_offset(a, b)        ((void *)0)
  33#define pmd_none(x)             (!pmd_val(x))
  34#define pmd_present(x)          (pmd_val(x))
  35#define pmd_clear(xp)           do { set_pmd(xp, __pmd(0)); } while (0)
  36#define pmd_bad(x)              (pmd_val(x) & ~PAGE_MASK)
  37
  38#define PAGE_NONE               __pgprot(0)    /* these mean nothing to NO_MM */
  39#define PAGE_SHARED             __pgprot(0)    /* these mean nothing to NO_MM */
  40#define PAGE_COPY               __pgprot(0)    /* these mean nothing to NO_MM */
  41#define PAGE_READONLY           __pgprot(0)    /* these mean nothing to NO_MM */
  42#define PAGE_KERNEL             __pgprot(0)    /* these mean nothing to NO_MM */
  43#define pgprot_noncached(prot)  (prot)
  44
  45extern void paging_init(void);
  46
  47#define __swp_type(x)           (0)
  48#define __swp_offset(x)         (0)
  49#define __swp_entry(typ, off)   ((swp_entry_t) { ((typ) | ((off) << 7)) })
  50#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  51#define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  52
  53static inline int pte_file(pte_t pte)
  54{
  55        return 0;
  56}
  57
  58#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  59#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
  60
  61/*
  62 * ZERO_PAGE is a global shared page that is always zero: used
  63 * for zero-mapped memory areas etc..
  64 */
  65#define ZERO_PAGE(vaddr)        virt_to_page(empty_zero_page)
  66extern unsigned long empty_zero_page;
  67
  68#define swapper_pg_dir ((pgd_t *) 0)
  69
  70/*
  71 * No page table caches to initialise
  72 */
  73#define pgtable_cache_init()   do { } while (0)
  74
  75#include <asm-generic/pgtable.h>
  76
  77#endif /* _ASM_C6X_PGTABLE_H */
  78