include/asm-ia64/page.h

   1 #ifndef _ASM_IA64_PAGE_H
   2 #define _ASM_IA64_PAGE_H
   3 /*
   4  * Pagetable related stuff.
   5  *
   6  * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
   7  *      David Mosberger-Tang <davidm@hpl.hp.com>
   8  */
   9
  10 #include <linux/config.h>
  11
  12 #include <asm/intrinsics.h>
  13 #include <asm/types.h>
  14
  15 /*
  16  * PAGE_SHIFT determines the actual kernel page size.
  17  */
  18 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
  19 # define PAGE_SHIFT     12
  20 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
  21 # define PAGE_SHIFT     13
  22 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
  23 # define PAGE_SHIFT     14
  24 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
  25 # define PAGE_SHIFT     16
  26 #else
  27 # error Unsupported page size!
  28 #endif
  29
  30 #define PAGE_SIZE               (__IA64_UL_CONST(1) << PAGE_SHIFT)
  31 #define PAGE_MASK               (~(PAGE_SIZE - 1))
  32 #define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
  33
  34 #define PERCPU_PAGE_SHIFT       16      /* log2() of max. size of per-CPU area */
  35 #define PERCPU_PAGE_SIZE        (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
  36
  37 #define RGN_MAP_LIMIT   ((1UL << (4*PAGE_SHIFT - 12)) - PAGE_SIZE)      /* per region addr limit */
  38
  39 #ifdef CONFIG_HUGETLB_PAGE
  40 # define REGION_HPAGE           (4UL)   /* note: this is hardcoded in reload_context()!*/
  41 # define REGION_SHIFT           61
  42 # define HPAGE_REGION_BASE      (REGION_HPAGE << REGION_SHIFT)
  43 # define HPAGE_SHIFT            hpage_shift
  44 # define HPAGE_SHIFT_DEFAULT    28      /* check ia64 SDM for architecture supported size */
  45 # define HPAGE_SIZE             (__IA64_UL_CONST(1) << HPAGE_SHIFT)
  46 # define HPAGE_MASK             (~(HPAGE_SIZE - 1))
  47
  48 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  49 # define ARCH_HAS_HUGEPAGE_ONLY_RANGE
  50 #endif /* CONFIG_HUGETLB_PAGE */
  51
  52 #ifdef __ASSEMBLY__
  53 # define __pa(x)                ((x) - PAGE_OFFSET)
  54 # define __va(x)                ((x) + PAGE_OFFSET)
  55 #else /* !__ASSEMBLY */
  56 # ifdef __KERNEL__
  57 #  define STRICT_MM_TYPECHECKS
  58
  59 extern void clear_page (void *page);
  60 extern void copy_page (void *to, void *from);
  61
  62 /*
  63  * clear_user_page() and copy_user_page() can't be inline functions because
  64  * flush_dcache_page() can't be defined until later...
  65  */
  66 #define clear_user_page(addr, vaddr, page)      \
  67 do {                                            \
  68         clear_page(addr);                       \
  69         flush_dcache_page(page);                \
  70 } while (0)
  71
  72 #define copy_user_page(to, from, vaddr, page)   \
  73 do {                                            \
  74         copy_page((to), (from));                \
  75         flush_dcache_page(page);                \
  76 } while (0)
  77
  78
  79 #define alloc_zeroed_user_highpage(vma, vaddr) \
  80 ({                                              \
  81         struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr); \
  82         if (page)                               \
  83                 flush_dcache_page(page);        \
  84         page;                                   \
  85 })
  86
  87 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  88
  89 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  90
  91 #ifdef CONFIG_VIRTUAL_MEM_MAP
  92 extern int ia64_pfn_valid (unsigned long pfn);
  93 #else
  94 # define ia64_pfn_valid(pfn) 1
  95 #endif
  96
  97 #ifndef CONFIG_DISCONTIGMEM
  98 # define pfn_valid(pfn)         (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
  99 # define page_to_pfn(page)      ((unsigned long) (page - mem_map))
 100 # define pfn_to_page(pfn)       (mem_map + (pfn))
 101 #else
 102 extern struct page *vmem_map;
 103 extern unsigned long max_low_pfn;
 104 # define pfn_valid(pfn)         (((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
 105 # define page_to_pfn(page)      ((unsigned long) (page - vmem_map))
 106 # define pfn_to_page(pfn)       (vmem_map + (pfn))
 107 #endif
 108
 109 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 110 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 111
 112 typedef union ia64_va {
 113         struct {
 114                 unsigned long off : 61;         /* intra-region offset */
 115                 unsigned long reg :  3;         /* region number */
 116         } f;
 117         unsigned long l;
 118         void *p;
 119 } ia64_va;
 120
 121 /*
 122  * Note: These macros depend on the fact that PAGE_OFFSET has all
 123  * region bits set to 1 and all other bits set to zero.  They are
 124  * expressed in this way to ensure they result in a single "dep"
 125  * instruction.
 126  */
 127 #define __pa(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
 128 #define __va(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
 129
 130 #define REGION_NUMBER(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
 131 #define REGION_OFFSET(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
 132
 133 #define REGION_SIZE             REGION_NUMBER(1)
 134 #define REGION_KERNEL           7
 135
 136 #ifdef CONFIG_HUGETLB_PAGE
 137 # define htlbpage_to_page(x)    (((unsigned long) REGION_NUMBER(x) << 61)                       \
 138                                  | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
 139 # define HUGETLB_PAGE_ORDER     (HPAGE_SHIFT - PAGE_SHIFT)
 140 # define is_hugepage_only_range(mm, addr, len)          \
 141          (REGION_NUMBER(addr) == REGION_HPAGE &&        \
 142           REGION_NUMBER((addr)+(len)) == REGION_HPAGE)
 143 extern unsigned int hpage_shift;
 144 #endif
 145
 146 static __inline__ int
 147 get_order (unsigned long size)
 148 {
 149         long double d = size - 1;
 150         long order;
 151
 152         order = ia64_getf_exp(d);
 153         order = order - PAGE_SHIFT - 0xffff + 1;
 154         if (order < 0)
 155                 order = 0;
 156         return order;
 157 }
 158
 159 # endif /* __KERNEL__ */
 160 #endif /* !__ASSEMBLY__ */
 161
 162 #ifdef STRICT_MM_TYPECHECKS
 163   /*
 164    * These are used to make use of C type-checking..
 165    */
 166   typedef struct { unsigned long pte; } pte_t;
 167   typedef struct { unsigned long pmd; } pmd_t;
 168   typedef struct { unsigned long pgd; } pgd_t;
 169   typedef struct { unsigned long pgprot; } pgprot_t;
 170
 171 # define pte_val(x)     ((x).pte)
 172 # define pmd_val(x)     ((x).pmd)
 173 # define pgd_val(x)     ((x).pgd)
 174 # define pgprot_val(x)  ((x).pgprot)
 175
 176 # define __pte(x)       ((pte_t) { (x) } )
 177 # define __pgprot(x)    ((pgprot_t) { (x) } )
 178
 179 #else /* !STRICT_MM_TYPECHECKS */
 180   /*
 181    * .. while these make it easier on the compiler
 182    */
 183 # ifndef __ASSEMBLY__
 184     typedef unsigned long pte_t;
 185     typedef unsigned long pmd_t;
 186     typedef unsigned long pgd_t;
 187     typedef unsigned long pgprot_t;
 188 # endif
 189
 190 # define pte_val(x)     (x)
 191 # define pmd_val(x)     (x)
 192 # define pgd_val(x)     (x)
 193 # define pgprot_val(x)  (x)
 194
 195 # define __pte(x)       (x)
 196 # define __pgd(x)       (x)
 197 # define __pgprot(x)    (x)
 198 #endif /* !STRICT_MM_TYPECHECKS */
 199
 200 #define PAGE_OFFSET                     __IA64_UL_CONST(0xe000000000000000)
 201
 202 #define VM_DATA_DEFAULT_FLAGS           (VM_READ | VM_WRITE |                                   \
 203                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |                \
 204                                          (((current->personality & READ_IMPLIES_EXEC) != 0)     \
 205                                           ? VM_EXEC : 0))
 206
 207 #endif /* _ASM_IA64_PAGE_H */