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_MIPS_HUGE_TLB_SUPPORT
  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#else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */
  42#define HPAGE_SHIFT     ({BUILD_BUG(); 0; })
  43#define HPAGE_SIZE      ({BUILD_BUG(); 0; })
  44#define HPAGE_MASK      ({BUILD_BUG(); 0; })
  45#define HUGETLB_PAGE_ORDER      ({BUILD_BUG(); 0; })
  46#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
  47
  48#include <linux/pfn.h>
  49
  50extern void build_clear_page(void);
  51extern void build_copy_page(void);
  52
  53/*
  54 * It's normally defined only for FLATMEM config but it's
  55 * used in our early mem init code for all memory models.
  56 * So always define it.
  57 */
  58#define ARCH_PFN_OFFSET         PFN_UP(PHYS_OFFSET)
  59
  60extern void clear_page(void * page);
  61extern void copy_page(void * to, void * from);
  62
  63extern unsigned long shm_align_mask;
  64
  65static inline unsigned long pages_do_alias(unsigned long addr1,
  66        unsigned long addr2)
  67{
  68        return (addr1 ^ addr2) & shm_align_mask;
  69}
  70
  71struct page;
  72
  73static inline void clear_user_page(void *addr, unsigned long vaddr,
  74        struct page *page)
  75{
  76        extern void (*flush_data_cache_page)(unsigned long addr);
  77
  78        clear_page(addr);
  79        if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
  80                flush_data_cache_page((unsigned long)addr);
  81}
  82
  83extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  84        struct page *to);
  85struct vm_area_struct;
  86extern void copy_user_highpage(struct page *to, struct page *from,
  87        unsigned long vaddr, struct vm_area_struct *vma);
  88
  89#define __HAVE_ARCH_COPY_USER_HIGHPAGE
  90
  91/*
  92 * These are used to make use of C type-checking..
  93 */
  94#ifdef CONFIG_64BIT_PHYS_ADDR
  95  #ifdef CONFIG_CPU_MIPS32
  96    typedef struct { unsigned long pte_low, pte_high; } pte_t;
  97    #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  98    #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  99  #else
 100     typedef struct { unsigned long long pte; } pte_t;
 101     #define pte_val(x) ((x).pte)
 102     #define __pte(x)   ((pte_t) { (x) } )
 103  #endif
 104#else
 105typedef struct { unsigned long pte; } pte_t;
 106#define pte_val(x)      ((x).pte)
 107#define __pte(x)        ((pte_t) { (x) } )
 108#endif
 109typedef struct page *pgtable_t;
 110
 111/*
 112 * Right now we don't support 4-level pagetables, so all pud-related
 113 * definitions come from <asm-generic/pgtable-nopud.h>.
 114 */
 115
 116/*
 117 * Finall the top of the hierarchy, the pgd
 118 */
 119typedef struct { unsigned long pgd; } pgd_t;
 120#define pgd_val(x)      ((x).pgd)
 121#define __pgd(x)        ((pgd_t) { (x) } )
 122
 123/*
 124 * Manipulate page protection bits
 125 */
 126typedef struct { unsigned long pgprot; } pgprot_t;
 127#define pgprot_val(x)   ((x).pgprot)
 128#define __pgprot(x)     ((pgprot_t) { (x) } )
 129
 130/*
 131 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 132 * pair of pages we only have a single global bit per pair of pages.  When
 133 * writing to the TLB make sure we always have the bit set for both pages
 134 * or none.  This macro is used to access the `buddy' of the pte we're just
 135 * working on.
 136 */
 137#define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
 138
 139/*
 140 * __pa()/__va() should be used only during mem init.
 141 */
 142#ifdef CONFIG_64BIT
 143#define __pa(x)                                                         \
 144({                                                                      \
 145    unsigned long __x = (unsigned long)(x);                             \
 146    __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);                     \
 147})
 148#else
 149#define __pa(x)                                                         \
 150    ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
 151#endif
 152#define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
 153#include <asm/io.h>
 154
 155/*
 156 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
 157 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org).  The
 158 * discussion can be found in lkml posting
 159 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
 160 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
 161 *
 162 * It is unclear if the misscompilations mentioned in
 163 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
 164 * until GCC 3.x has been retired before we can apply
 165 * https://patchwork.linux-mips.org/patch/1541/
 166 */
 167
 168#define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
 169
 170#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 171
 172#ifdef CONFIG_FLATMEM
 173
 174static inline int pfn_valid(unsigned long pfn)
 175{
 176        /* avoid <linux/mm.h> include hell */
 177        extern unsigned long max_mapnr;
 178
 179        return pfn >= ARCH_PFN_OFFSET && pfn < max_mapnr;
 180}
 181
 182#elif defined(CONFIG_SPARSEMEM)
 183
 184/* pfn_valid is defined in linux/mmzone.h */
 185
 186#elif defined(CONFIG_NEED_MULTIPLE_NODES)
 187
 188#define pfn_valid(pfn)                                                  \
 189({                                                                      \
 190        unsigned long __pfn = (pfn);                                    \
 191        int __n = pfn_to_nid(__pfn);                                    \
 192        ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +         \
 193                               NODE_DATA(__n)->node_spanned_pages)      \
 194                    : 0);                                               \
 195})
 196
 197#endif
 198
 199#define virt_to_page(kaddr)     pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
 200
 201extern int __virt_addr_valid(const volatile void *kaddr);
 202#define virt_addr_valid(kaddr)                                          \
 203        __virt_addr_valid((const volatile void *) (kaddr))
 204
 205#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 206                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 207
 208#define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)
 209#define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)
 210
 211#include <asm-generic/memory_model.h>
 212#include <asm-generic/getorder.h>
 213
 214#endif /* _ASM_PAGE_H */
 215