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#else /* !CONFIG_HUGETLB_PAGE */
  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_HUGETLB_PAGE */
  47
  48#ifndef __ASSEMBLY__
  49
  50#include <linux/pfn.h>
  51#include <asm/io.h>
  52
  53extern void build_clear_page(void);
  54extern void build_copy_page(void);
  55
  56/*
  57 * It's normally defined only for FLATMEM config but it's
  58 * used in our early mem init code for all memory models.
  59 * So always define it.
  60 */
  61#define ARCH_PFN_OFFSET         PFN_UP(PHYS_OFFSET)
  62
  63extern void clear_page(void * page);
  64extern void copy_page(void * to, void * from);
  65
  66extern unsigned long shm_align_mask;
  67
  68static inline unsigned long pages_do_alias(unsigned long addr1,
  69        unsigned long addr2)
  70{
  71        return (addr1 ^ addr2) & shm_align_mask;
  72}
  73
  74struct page;
  75
  76static inline void clear_user_page(void *addr, unsigned long vaddr,
  77        struct page *page)
  78{
  79        extern void (*flush_data_cache_page)(unsigned long addr);
  80
  81        clear_page(addr);
  82        if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
  83                flush_data_cache_page((unsigned long)addr);
  84}
  85
  86extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  87        struct page *to);
  88struct vm_area_struct;
  89extern void copy_user_highpage(struct page *to, struct page *from,
  90        unsigned long vaddr, struct vm_area_struct *vma);
  91
  92#define __HAVE_ARCH_COPY_USER_HIGHPAGE
  93
  94/*
  95 * These are used to make use of C type-checking..
  96 */
  97#ifdef CONFIG_64BIT_PHYS_ADDR
  98  #ifdef CONFIG_CPU_MIPS32
  99    typedef struct { unsigned long pte_low, pte_high; } pte_t;
 100    #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
 101    #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
 102  #else
 103     typedef struct { unsigned long long pte; } pte_t;
 104     #define pte_val(x) ((x).pte)
 105     #define __pte(x)   ((pte_t) { (x) } )
 106  #endif
 107#else
 108typedef struct { unsigned long pte; } pte_t;
 109#define pte_val(x)      ((x).pte)
 110#define __pte(x)        ((pte_t) { (x) } )
 111#endif
 112typedef struct page *pgtable_t;
 113
 114/*
 115 * Right now we don't support 4-level pagetables, so all pud-related
 116 * definitions come from <asm-generic/pgtable-nopud.h>.
 117 */
 118
 119/*
 120 * Finall the top of the hierarchy, the pgd
 121 */
 122typedef struct { unsigned long pgd; } pgd_t;
 123#define pgd_val(x)      ((x).pgd)
 124#define __pgd(x)        ((pgd_t) { (x) } )
 125
 126/*
 127 * Manipulate page protection bits
 128 */
 129typedef struct { unsigned long pgprot; } pgprot_t;
 130#define pgprot_val(x)   ((x).pgprot)
 131#define __pgprot(x)     ((pgprot_t) { (x) } )
 132
 133/*
 134 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 135 * pair of pages we only have a single global bit per pair of pages.  When
 136 * writing to the TLB make sure we always have the bit set for both pages
 137 * or none.  This macro is used to access the `buddy' of the pte we're just
 138 * working on.
 139 */
 140#define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
 141
 142#endif /* !__ASSEMBLY__ */
 143
 144/*
 145 * __pa()/__va() should be used only during mem init.
 146 */
 147#ifdef CONFIG_64BIT
 148#define __pa(x)                                                         \
 149({                                                                      \
 150    unsigned long __x = (unsigned long)(x);                             \
 151    __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);                     \
 152})
 153#else
 154#define __pa(x)                                                         \
 155    ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
 156#endif
 157#define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
 158
 159/*
 160 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
 161 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org).  The
 162 * discussion can be found in lkml posting
 163 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
 164 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
 165 *
 166 * It is unclear if the misscompilations mentioned in
 167 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
 168 * until GCC 3.x has been retired before we can apply
 169 * https://patchwork.linux-mips.org/patch/1541/
 170 */
 171
 172#define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
 173
 174#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 175
 176#ifdef CONFIG_FLATMEM
 177
 178#define pfn_valid(pfn)                                                  \
 179({                                                                      \
 180        unsigned long __pfn = (pfn);                                    \
 181        /* avoid <linux/bootmem.h> include hell */                      \
 182        extern unsigned long min_low_pfn;                               \
 183                                                                        \
 184        __pfn >= min_low_pfn && __pfn < max_mapnr;                      \
 185})
 186
 187#elif defined(CONFIG_SPARSEMEM)
 188
 189/* pfn_valid is defined in linux/mmzone.h */
 190
 191#elif defined(CONFIG_NEED_MULTIPLE_NODES)
 192
 193#define pfn_valid(pfn)                                                  \
 194({                                                                      \
 195        unsigned long __pfn = (pfn);                                    \
 196        int __n = pfn_to_nid(__pfn);                                    \
 197        ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +         \
 198                               NODE_DATA(__n)->node_spanned_pages)      \
 199                    : 0);                                               \
 200})
 201
 202#endif
 203
 204#define virt_to_page(kaddr)     pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
 205#define virt_addr_valid(kaddr)  pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
 206
 207#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 208                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 209
 210#define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE +    \
 211                                                                PHYS_OFFSET)
 212#define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET -    \
 213                                                                PHYS_OFFSET)
 214
 215#include <asm-generic/memory_model.h>
 216#include <asm-generic/getorder.h>
 217
 218#endif /* _ASM_PAGE_H */
 219