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 <asm/intrinsics.h>
  11 #include <asm/types.h>
  12
  13 /*
  14  * The top three bits of an IA64 address are its Region Number.
  15  * Different regions are assigned to different purposes.
  16  */
  17 #define RGN_SHIFT       (61)
  18 #define RGN_BASE(r)     (__IA64_UL_CONST(r)<<RGN_SHIFT)
  19 #define RGN_BITS        (RGN_BASE(-1))
  20
  21 #define RGN_KERNEL      7       /* Identity mapped region */
  22 #define RGN_UNCACHED    6       /* Identity mapped I/O region */
  23 #define RGN_GATE        5       /* Gate page, Kernel text, etc */
  24 #define RGN_HPAGE       4       /* For Huge TLB pages */
  25
  26 /*
  27  * PAGE_SHIFT determines the actual kernel page size.
  28  */
  29 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
  30 # define PAGE_SHIFT     12
  31 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
  32 # define PAGE_SHIFT     13
  33 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
  34 # define PAGE_SHIFT     14
  35 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
  36 # define PAGE_SHIFT     16
  37 #else
  38 # error Unsupported page size!
  39 #endif
  40
  41 #define PAGE_SIZE               (__IA64_UL_CONST(1) << PAGE_SHIFT)
  42 #define PAGE_MASK               (~(PAGE_SIZE - 1))
  43 #define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
  44
  45 #define PERCPU_PAGE_SHIFT       16      /* log2() of max. size of per-CPU area */
  46 #define PERCPU_PAGE_SIZE        (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
  47
  48
  49 #ifdef CONFIG_HUGETLB_PAGE
  50 # define HPAGE_REGION_BASE      RGN_BASE(RGN_HPAGE)
  51 # define HPAGE_SHIFT            hpage_shift
  52 # define HPAGE_SHIFT_DEFAULT    28      /* check ia64 SDM for architecture supported size */
  53 # define HPAGE_SIZE             (__IA64_UL_CONST(1) << HPAGE_SHIFT)
  54 # define HPAGE_MASK             (~(HPAGE_SIZE - 1))
  55
  56 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  57 # define ARCH_HAS_HUGEPAGE_ONLY_RANGE
  58 # define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  59 # define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
  60 #endif /* CONFIG_HUGETLB_PAGE */
  61
  62 #ifdef __ASSEMBLY__
  63 # define __pa(x)                ((x) - PAGE_OFFSET)
  64 # define __va(x)                ((x) + PAGE_OFFSET)
  65 #else /* !__ASSEMBLY */
  66 #  define STRICT_MM_TYPECHECKS
  67
  68 extern void clear_page (void *page);
  69 extern void copy_page (void *to, void *from);
  70
  71 /*
  72  * clear_user_page() and copy_user_page() can't be inline functions because
  73  * flush_dcache_page() can't be defined until later...
  74  */
  75 #define clear_user_page(addr, vaddr, page)      \
  76 do {                                            \
  77         clear_page(addr);                       \
  78         flush_dcache_page(page);                \
  79 } while (0)
  80
  81 #define copy_user_page(to, from, vaddr, page)   \
  82 do {                                            \
  83         copy_page((to), (from));                \
  84         flush_dcache_page(page);                \
  85 } while (0)
  86
  87
  88 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr)          \
  89 ({                                                                      \
  90         struct page *page = alloc_page_vma(                             \
  91                 GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr);  \
  92         if (page)                                                       \
  93                 flush_dcache_page(page);                                \
  94         page;                                                           \
  95 })
  96
  97 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  98
  99 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 100
 101 #ifdef CONFIG_VIRTUAL_MEM_MAP
 102 extern int ia64_pfn_valid (unsigned long pfn);
 103 #else
 104 # define ia64_pfn_valid(pfn) 1
 105 #endif
 106
 107 #ifdef CONFIG_VIRTUAL_MEM_MAP
 108 extern struct page *vmem_map;
 109 #ifdef CONFIG_DISCONTIGMEM
 110 # define page_to_pfn(page)      ((unsigned long) (page - vmem_map))
 111 # define pfn_to_page(pfn)       (vmem_map + (pfn))
 112 #else
 113 # include <asm-generic/memory_model.h>
 114 #endif
 115 #else
 116 # include <asm-generic/memory_model.h>
 117 #endif
 118
 119 #ifdef CONFIG_FLATMEM
 120 # define pfn_valid(pfn)         (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
 121 #elif defined(CONFIG_DISCONTIGMEM)
 122 extern unsigned long min_low_pfn;
 123 extern unsigned long max_low_pfn;
 124 # define pfn_valid(pfn)         (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
 125 #endif
 126
 127 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 128 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 129 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 130
 131 typedef union ia64_va {
 132         struct {
 133                 unsigned long off : 61;         /* intra-region offset */
 134                 unsigned long reg :  3;         /* region number */
 135         } f;
 136         unsigned long l;
 137         void *p;
 138 } ia64_va;
 139
 140 /*
 141  * Note: These macros depend on the fact that PAGE_OFFSET has all
 142  * region bits set to 1 and all other bits set to zero.  They are
 143  * expressed in this way to ensure they result in a single "dep"
 144  * instruction.
 145  */
 146 #define __pa(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
 147 #define __va(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
 148
 149 #define REGION_NUMBER(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
 150 #define REGION_OFFSET(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
 151
 152 #ifdef CONFIG_HUGETLB_PAGE
 153 # define htlbpage_to_page(x)    (((unsigned long) REGION_NUMBER(x) << 61)                       \
 154                                  | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
 155 # define HUGETLB_PAGE_ORDER     (HPAGE_SHIFT - PAGE_SHIFT)
 156 # define is_hugepage_only_range(mm, addr, len)          \
 157          (REGION_NUMBER(addr) == RGN_HPAGE ||   \
 158           REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
 159 extern unsigned int hpage_shift;
 160 #endif
 161
 162 static __inline__ int
 163 get_order (unsigned long size)
 164 {
 165         long double d = size - 1;
 166         long order;
 167
 168         order = ia64_getf_exp(d);
 169         order = order - PAGE_SHIFT - 0xffff + 1;
 170         if (order < 0)
 171                 order = 0;
 172         return order;
 173 }
 174
 175 #endif /* !__ASSEMBLY__ */
 176
 177 #ifdef STRICT_MM_TYPECHECKS
 178   /*
 179    * These are used to make use of C type-checking..
 180    */
 181   typedef struct { unsigned long pte; } pte_t;
 182   typedef struct { unsigned long pmd; } pmd_t;
 183 #ifdef CONFIG_PGTABLE_4
 184   typedef struct { unsigned long pud; } pud_t;
 185 #endif
 186   typedef struct { unsigned long pgd; } pgd_t;
 187   typedef struct { unsigned long pgprot; } pgprot_t;
 188
 189 # define pte_val(x)     ((x).pte)
 190 # define pmd_val(x)     ((x).pmd)
 191 #ifdef CONFIG_PGTABLE_4
 192 # define pud_val(x)     ((x).pud)
 193 #endif
 194 # define pgd_val(x)     ((x).pgd)
 195 # define pgprot_val(x)  ((x).pgprot)
 196
 197 # define __pte(x)       ((pte_t) { (x) } )
 198 # define __pgprot(x)    ((pgprot_t) { (x) } )
 199
 200 #else /* !STRICT_MM_TYPECHECKS */
 201   /*
 202    * .. while these make it easier on the compiler
 203    */
 204 # ifndef __ASSEMBLY__
 205     typedef unsigned long pte_t;
 206     typedef unsigned long pmd_t;
 207     typedef unsigned long pgd_t;
 208     typedef unsigned long pgprot_t;
 209 # endif
 210
 211 # define pte_val(x)     (x)
 212 # define pmd_val(x)     (x)
 213 # define pgd_val(x)     (x)
 214 # define pgprot_val(x)  (x)
 215
 216 # define __pte(x)       (x)
 217 # define __pgd(x)       (x)
 218 # define __pgprot(x)    (x)
 219 #endif /* !STRICT_MM_TYPECHECKS */
 220
 221 #define PAGE_OFFSET                     RGN_BASE(RGN_KERNEL)
 222
 223 #define VM_DATA_DEFAULT_FLAGS           (VM_READ | VM_WRITE |                                   \
 224                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |                \
 225                                          (((current->personality & READ_IMPLIES_EXEC) != 0)     \
 226                                           ? VM_EXEC : 0))
 227
 228 #endif /* _ASM_IA64_PAGE_H */