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  */
  42 static 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
  75 extern void build_clear_page(void);
  76 extern 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
  85 extern void clear_page(void * page);
  86 extern void copy_page(void * to, void * from);
  87
  88 extern unsigned long shm_align_mask;
  89
  90 static inline unsigned long pages_do_alias(unsigned long addr1,
  91         unsigned long addr2)
  92 {
  93         return (addr1 ^ addr2) & shm_align_mask;
  94 }
  95
  96 struct page;
  97
  98 static 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
 108 struct vm_area_struct;
 109 extern 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
 128 typedef struct { unsigned long pte; } pte_t;
 129 #define pte_val(x)      ((x).pte)
 130 #define __pte(x)        ((pte_t) { (x) } )
 131 #endif
 132 typedef 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  */
 142 typedef 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  */
 149 typedef 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
 199 static inline int pfn_valid(unsigned long pfn)
 200 {
 201         /* avoid <linux/mm.h> include hell */
 202         extern unsigned long max_mapnr;
 203
 204         return pfn >= ARCH_PFN_OFFSET && pfn < max_mapnr;
 205 }
 206
 207 #elif defined(CONFIG_SPARSEMEM)
 208
 209 /* pfn_valid is defined in linux/mmzone.h */
 210
 211 #elif defined(CONFIG_NEED_MULTIPLE_NODES)
 212
 213 #define pfn_valid(pfn)                                                  \
 214 ({                                                                      \
 215         unsigned long __pfn = (pfn);                                    \
 216         int __n = pfn_to_nid(__pfn);                                    \
 217         ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +         \
 218                                NODE_DATA(__n)->node_spanned_pages)      \
 219                     : 0);                                               \
 220 })
 221
 222 #endif
 223
 224 #define virt_to_page(kaddr)     pfn_to_page(PFN_DOWN(virt_to_phys((void *)     \
 225                                                                   (kaddr))))
 226
 227 extern int __virt_addr_valid(const volatile void *kaddr);
 228 #define virt_addr_valid(kaddr)                                          \
 229         __virt_addr_valid((const volatile void *) (kaddr))
 230
 231 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 232                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 233
 234 #define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)
 235 #define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)
 236
 237 #include <asm-generic/memory_model.h>
 238 #include <asm-generic/getorder.h>
 239
 240 #endif /* _ASM_PAGE_H */