LXR linux/arch/mips/include/asm/page.h

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
   7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   8 */
   9#ifndef _ASM_PAGE_H
  10#define _ASM_PAGE_H
  11
  12#include <spaces.h>
  13#include <linux/const.h>
  14
  15/*
  16 * PAGE_SHIFT determines the page size
  17 */
  18#ifdef CONFIG_PAGE_SIZE_4KB
  19#define PAGE_SHIFT      12
  20#endif
  21#ifdef CONFIG_PAGE_SIZE_8KB
  22#define PAGE_SHIFT      13
  23#endif
  24#ifdef CONFIG_PAGE_SIZE_16KB
  25#define PAGE_SHIFT      14
  26#endif
  27#ifdef CONFIG_PAGE_SIZE_32KB
  28#define PAGE_SHIFT      15
  29#endif
  30#ifdef CONFIG_PAGE_SIZE_64KB
  31#define PAGE_SHIFT      16
  32#endif
  33#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  34#define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
  35
  36#ifdef CONFIG_HUGETLB_PAGE
  37#define HPAGE_SHIFT     (PAGE_SHIFT + PAGE_SHIFT - 3)
  38#define HPAGE_SIZE      (_AC(1,UL) << HPAGE_SHIFT)
  39#define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  40#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  41#endif /* CONFIG_HUGETLB_PAGE */
  42
  43#ifndef __ASSEMBLY__
  44
  45#include <linux/pfn.h>
  46#include <asm/io.h>
  47
  48extern void build_clear_page(void);
  49extern void build_copy_page(void);
  50
  51/*
  52 * It's normally defined only for FLATMEM config but it's
  53 * used in our early mem init code for all memory models.
  54 * So always define it.
  55 */
  56#define ARCH_PFN_OFFSET         PFN_UP(PHYS_OFFSET)
  57
  58extern void clear_page(void * page);
  59extern void copy_page(void * to, void * from);
  60
  61extern unsigned long shm_align_mask;
  62
  63static inline unsigned long pages_do_alias(unsigned long addr1,
  64        unsigned long addr2)
  65{
  66        return (addr1 ^ addr2) & shm_align_mask;
  67}
  68
  69struct page;
  70
  71static inline void clear_user_page(void *addr, unsigned long vaddr,
  72        struct page *page)
  73{
  74        extern void (*flush_data_cache_page)(unsigned long addr);
  75
  76        clear_page(addr);
  77        if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
  78                flush_data_cache_page((unsigned long)addr);
  79}
  80
  81extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  82        struct page *to);
  83struct vm_area_struct;
  84extern void copy_user_highpage(struct page *to, struct page *from,
  85        unsigned long vaddr, struct vm_area_struct *vma);
  86
  87#define __HAVE_ARCH_COPY_USER_HIGHPAGE
  88
  89/*
  90 * These are used to make use of C type-checking..
  91 */
  92#ifdef CONFIG_64BIT_PHYS_ADDR
  93  #ifdef CONFIG_CPU_MIPS32
  94    typedef struct { unsigned long pte_low, pte_high; } pte_t;
  95    #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  96    #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  97  #else
  98     typedef struct { unsigned long long pte; } pte_t;
  99     #define pte_val(x) ((x).pte)
 100     #define __pte(x)   ((pte_t) { (x) } )
 101  #endif
 102#else
 103typedef struct { unsigned long pte; } pte_t;
 104#define pte_val(x)      ((x).pte)
 105#define __pte(x)        ((pte_t) { (x) } )
 106#endif
 107typedef struct page *pgtable_t;
 108
 109/*
 110 * For 3-level pagetables we defines these ourselves, for 2-level the
 111 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
 112 */
 113#ifdef CONFIG_64BIT
 114
 115typedef struct { unsigned long pmd; } pmd_t;
 116#define pmd_val(x)      ((x).pmd)
 117#define __pmd(x)        ((pmd_t) { (x) } )
 118
 119#endif
 120
 121/*
 122 * Right now we don't support 4-level pagetables, so all pud-related
 123 * definitions come from <asm-generic/pgtable-nopud.h>.
 124 */
 125
 126/*
 127 * Finall the top of the hierarchy, the pgd
 128 */
 129typedef struct { unsigned long pgd; } pgd_t;
 130#define pgd_val(x)      ((x).pgd)
 131#define __pgd(x)        ((pgd_t) { (x) } )
 132
 133/*
 134 * Manipulate page protection bits
 135 */
 136typedef struct { unsigned long pgprot; } pgprot_t;
 137#define pgprot_val(x)   ((x).pgprot)
 138#define __pgprot(x)     ((pgprot_t) { (x) } )
 139
 140/*
 141 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 142 * pair of pages we only have a single global bit per pair of pages.  When
 143 * writing to the TLB make sure we always have the bit set for both pages
 144 * or none.  This macro is used to access the `buddy' of the pte we're just
 145 * working on.
 146 */
 147#define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
 148
 149#endif /* !__ASSEMBLY__ */
 150
 151/*
 152 * __pa()/__va() should be used only during mem init.
 153 */
 154#ifdef CONFIG_64BIT
 155#define __pa(x)                                                         \
 156({                                                                      \
 157    unsigned long __x = (unsigned long)(x);                             \
 158    __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);                     \
 159})
 160#else
 161#define __pa(x)                                                         \
 162    ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
 163#endif
 164#define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
 165#define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
 166
 167#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 168
 169#ifdef CONFIG_FLATMEM
 170
 171#define pfn_valid(pfn)                                                  \
 172({                                                                      \
 173        unsigned long __pfn = (pfn);                                    \
 174        /* avoid <linux/bootmem.h> include hell */                      \
 175        extern unsigned long min_low_pfn;                               \
 176                                                                        \
 177        __pfn >= min_low_pfn && __pfn < max_mapnr;                      \
 178})
 179
 180#elif defined(CONFIG_SPARSEMEM)
 181
 182/* pfn_valid is defined in linux/mmzone.h */
 183
 184#elif defined(CONFIG_NEED_MULTIPLE_NODES)
 185
 186#define pfn_valid(pfn)                                                  \
 187({                                                                      \
 188        unsigned long __pfn = (pfn);                                    \
 189        int __n = pfn_to_nid(__pfn);                                    \
 190        ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +         \
 191                               NODE_DATA(__n)->node_spanned_pages)      \
 192                    : 0);                                               \
 193})
 194
 195#endif
 196
 197#define virt_to_page(kaddr)     pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
 198#define virt_addr_valid(kaddr)  pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
 199
 200#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 201                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 202
 203#define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)
 204#define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)
 205
 206#include <asm-generic/memory_model.h>
 207#include <asm-generic/getorder.h>
 208
 209#endif /* _ASM_PAGE_H */
 210