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#include <linux/kernel.h>
  15#include <asm/mipsregs.h>
  16
  17/*
  18 * PAGE_SHIFT determines the page size
  19 */
  20#ifdef CONFIG_PAGE_SIZE_4KB
  21#define PAGE_SHIFT      12
  22#endif
  23#ifdef CONFIG_PAGE_SIZE_8KB
  24#define PAGE_SHIFT      13
  25#endif
  26#ifdef CONFIG_PAGE_SIZE_16KB
  27#define PAGE_SHIFT      14
  28#endif
  29#ifdef CONFIG_PAGE_SIZE_32KB
  30#define PAGE_SHIFT      15
  31#endif
  32#ifdef CONFIG_PAGE_SIZE_64KB
  33#define PAGE_SHIFT      16
  34#endif
  35#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  36#define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
  37
  38/*
  39 * This is used for calculating the real page sizes
  40 * for FTLB or VTLB + FTLB configurations.
  41 */
  42static inline unsigned int page_size_ftlb(unsigned int mmuextdef)
  43{
  44        switch (mmuextdef) {
  45        case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
  46                if (PAGE_SIZE == (1 << 30))
  47                        return 5;
  48                if (PAGE_SIZE == (1llu << 32))
  49                        return 6;
  50                if (PAGE_SIZE > (256 << 10))
  51                        return 7; /* reserved */
  52                        /* fall through */
  53        case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
  54                return (PAGE_SHIFT - 10) / 2;
  55        default:
  56                panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n",
  57                      mmuextdef >> 14);
  58        }
  59}
  60
  61#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
  62#define HPAGE_SHIFT     (PAGE_SHIFT + PAGE_SHIFT - 3)
  63#define HPAGE_SIZE      (_AC(1,UL) << HPAGE_SHIFT)
  64#define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  65#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  66#else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */
  67#define HPAGE_SHIFT     ({BUILD_BUG(); 0; })
  68#define HPAGE_SIZE      ({BUILD_BUG(); 0; })
  69#define HPAGE_MASK      ({BUILD_BUG(); 0; })
  70#define HUGETLB_PAGE_ORDER      ({BUILD_BUG(); 0; })
  71#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
  72
  73#include <linux/pfn.h>
  74
  75extern void build_clear_page(void);
  76extern void build_copy_page(void);
  77
  78/*
  79 * It's normally defined only for FLATMEM config but it's
  80 * used in our early mem init code for all memory models.
  81 * So always define it.
  82 */
  83#define ARCH_PFN_OFFSET         PFN_UP(PHYS_OFFSET)
  84
  85extern void clear_page(void * page);
  86extern void copy_page(void * to, void * from);
  87
  88extern unsigned long shm_align_mask;
  89
  90static inline unsigned long pages_do_alias(unsigned long addr1,
  91        unsigned long addr2)
  92{
  93        return (addr1 ^ addr2) & shm_align_mask;
  94}
  95
  96struct page;
  97
  98static inline void clear_user_page(void *addr, unsigned long vaddr,
  99        struct page *page)
 100{
 101        extern void (*flush_data_cache_page)(unsigned long addr);
 102
 103        clear_page(addr);
 104        if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
 105                flush_data_cache_page((unsigned long)addr);
 106}
 107
 108struct vm_area_struct;
 109extern void copy_user_highpage(struct page *to, struct page *from,
 110        unsigned long vaddr, struct vm_area_struct *vma);
 111
 112#define __HAVE_ARCH_COPY_USER_HIGHPAGE
 113
 114/*
 115 * These are used to make use of C type-checking..
 116 */
 117#ifdef CONFIG_PHYS_ADDR_T_64BIT
 118  #ifdef CONFIG_CPU_MIPS32
 119    typedef struct { unsigned long pte_low, pte_high; } pte_t;
 120    #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
 121    #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
 122  #else
 123     typedef struct { unsigned long long pte; } pte_t;
 124     #define pte_val(x) ((x).pte)
 125     #define __pte(x)   ((pte_t) { (x) } )
 126  #endif
 127#else
 128typedef struct { unsigned long pte; } pte_t;
 129#define pte_val(x)      ((x).pte)
 130#define __pte(x)        ((pte_t) { (x) } )
 131#endif
 132typedef struct page *pgtable_t;
 133
 134/*
 135 * Right now we don't support 4-level pagetables, so all pud-related
 136 * definitions come from <asm-generic/pgtable-nopud.h>.
 137 */
 138
 139/*
 140 * Finall the top of the hierarchy, the pgd
 141 */
 142typedef struct { unsigned long pgd; } pgd_t;
 143#define pgd_val(x)      ((x).pgd)
 144#define __pgd(x)        ((pgd_t) { (x) } )
 145
 146/*
 147 * Manipulate page protection bits
 148 */
 149typedef struct { unsigned long pgprot; } pgprot_t;
 150#define pgprot_val(x)   ((x).pgprot)
 151#define __pgprot(x)     ((pgprot_t) { (x) } )
 152
 153/*
 154 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 155 * pair of pages we only have a single global bit per pair of pages.  When
 156 * writing to the TLB make sure we always have the bit set for both pages
 157 * or none.  This macro is used to access the `buddy' of the pte we're just
 158 * working on.
 159 */
 160#define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
 161
 162/*
 163 * __pa()/__va() should be used only during mem init.
 164 */
 165#ifdef CONFIG_64BIT
 166#define __pa(x)                                                         \
 167({                                                                      \
 168    unsigned long __x = (unsigned long)(x);                             \
 169    __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);                     \
 170})
 171#else
 172#define __pa(x)                                                         \
 173    ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
 174#endif
 175#define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
 176#include <asm/io.h>
 177
 178/*
 179 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
 180 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org).  The
 181 * discussion can be found in lkml posting
 182 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
 183 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
 184 *
 185 * It is unclear if the misscompilations mentioned in
 186 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
 187 * until GCC 3.x has been retired before we can apply
 188 * https://patchwork.linux-mips.org/patch/1541/
 189 */
 190
 191#ifndef __pa_symbol
 192#define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
 193#endif
 194
 195#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 196
 197#ifdef CONFIG_FLATMEM
 198
 199static inline int pfn_valid(unsigned long pfn)
 200{
 201        /* avoid <linux/mm.h> include hell */
 202        extern unsigned long max_mapnr;
 203        unsigned long pfn_offset = ARCH_PFN_OFFSET;
 204
 205        return pfn >= pfn_offset && pfn < max_mapnr;
 206}
 207
 208#elif defined(CONFIG_SPARSEMEM)
 209
 210/* pfn_valid is defined in linux/mmzone.h */
 211
 212#elif defined(CONFIG_NEED_MULTIPLE_NODES)
 213
 214#define pfn_valid(pfn)                                                  \
 215({                                                                      \
 216        unsigned long __pfn = (pfn);                                    \
 217        int __n = pfn_to_nid(__pfn);                                    \
 218        ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +         \
 219                               NODE_DATA(__n)->node_spanned_pages)      \
 220                    : 0);                                               \
 221})
 222
 223#endif
 224
 225#define virt_to_page(kaddr)     pfn_to_page(PFN_DOWN(virt_to_phys((void *)     \
 226                                                                  (kaddr))))
 227
 228extern int __virt_addr_valid(const volatile void *kaddr);
 229#define virt_addr_valid(kaddr)                                          \
 230        __virt_addr_valid((const volatile void *) (kaddr))
 231
 232#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 233                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 234
 235#define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)
 236#define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)
 237
 238#include <asm-generic/memory_model.h>
 239#include <asm-generic/getorder.h>
 240
 241#endif /* _ASM_PAGE_H */
 242