arch/ia64/include/asm/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
  44 #define PERCPU_PAGE_SHIFT       18      /* log2() of max. size of per-CPU area */
  45 #define PERCPU_PAGE_SIZE        (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
  46
  47
  48 #ifdef CONFIG_HUGETLB_PAGE
  49 # define HPAGE_REGION_BASE      RGN_BASE(RGN_HPAGE)
  50 # define HPAGE_SHIFT            hpage_shift
  51 # define HPAGE_SHIFT_DEFAULT    28      /* check ia64 SDM for architecture supported size */
  52 # define HPAGE_SIZE             (__IA64_UL_CONST(1) << HPAGE_SHIFT)
  53 # define HPAGE_MASK             (~(HPAGE_SIZE - 1))
  54
  55 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  56 #endif /* CONFIG_HUGETLB_PAGE */
  57
  58 #ifdef __ASSEMBLY__
  59 # define __pa(x)                ((x) - PAGE_OFFSET)
  60 # define __va(x)                ((x) + PAGE_OFFSET)
  61 #else /* !__ASSEMBLY */
  62 #  define STRICT_MM_TYPECHECKS
  63
  64 extern void clear_page (void *page);
  65 extern void copy_page (void *to, void *from);
  66
  67 /*
  68  * clear_user_page() and copy_user_page() can't be inline functions because
  69  * flush_dcache_page() can't be defined until later...
  70  */
  71 #define clear_user_page(addr, vaddr, page)      \
  72 do {                                            \
  73         clear_page(addr);                       \
  74         flush_dcache_page(page);                \
  75 } while (0)
  76
  77 #define copy_user_page(to, from, vaddr, page)   \
  78 do {                                            \
  79         copy_page((to), (from));                \
  80         flush_dcache_page(page);                \
  81 } while (0)
  82
  83
  84 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr)          \
  85 ({                                                                      \
  86         struct page *page = alloc_page_vma(                             \
  87                 GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr);  \
  88         if (page)                                                       \
  89                 flush_dcache_page(page);                                \
  90         page;                                                           \
  91 })
  92
  93 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  94
  95 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  96
  97 #ifdef CONFIG_VIRTUAL_MEM_MAP
  98 extern int ia64_pfn_valid (unsigned long pfn);
  99 #else
 100 # define ia64_pfn_valid(pfn) 1
 101 #endif
 102
 103 #ifdef CONFIG_VIRTUAL_MEM_MAP
 104 extern struct page *vmem_map;
 105 #ifdef CONFIG_DISCONTIGMEM
 106 # define page_to_pfn(page)      ((unsigned long) (page - vmem_map))
 107 # define pfn_to_page(pfn)       (vmem_map + (pfn))
 108 #else
 109 # include <asm-generic/memory_model.h>
 110 #endif
 111 #else
 112 # include <asm-generic/memory_model.h>
 113 #endif
 114
 115 #ifdef CONFIG_FLATMEM
 116 # define pfn_valid(pfn)         (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
 117 #elif defined(CONFIG_DISCONTIGMEM)
 118 extern unsigned long min_low_pfn;
 119 extern unsigned long max_low_pfn;
 120 # define pfn_valid(pfn)         (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
 121 #endif
 122
 123 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 124 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 125 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 126
 127 typedef union ia64_va {
 128         struct {
 129                 unsigned long off : 61;         /* intra-region offset */
 130                 unsigned long reg :  3;         /* region number */
 131         } f;
 132         unsigned long l;
 133         void *p;
 134 } ia64_va;
 135
 136 /*
 137  * Note: These macros depend on the fact that PAGE_OFFSET has all
 138  * region bits set to 1 and all other bits set to zero.  They are
 139  * expressed in this way to ensure they result in a single "dep"
 140  * instruction.
 141  */
 142 #define __pa(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
 143 #define __va(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
 144
 145 #define REGION_NUMBER(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
 146 #define REGION_OFFSET(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
 147
 148 #ifdef CONFIG_HUGETLB_PAGE
 149 # define htlbpage_to_page(x)    (((unsigned long) REGION_NUMBER(x) << 61)                       \
 150                                  | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
 151 # define HUGETLB_PAGE_ORDER     (HPAGE_SHIFT - PAGE_SHIFT)
 152 extern unsigned int hpage_shift;
 153 #endif
 154
 155 static __inline__ int
 156 get_order (unsigned long size)
 157 {
 158         long double d = size - 1;
 159         long order;
 160
 161         order = ia64_getf_exp(d);
 162         order = order - PAGE_SHIFT - 0xffff + 1;
 163         if (order < 0)
 164                 order = 0;
 165         return order;
 166 }
 167
 168 #endif /* !__ASSEMBLY__ */
 169
 170 #ifdef STRICT_MM_TYPECHECKS
 171   /*
 172    * These are used to make use of C type-checking..
 173    */
 174   typedef struct { unsigned long pte; } pte_t;
 175   typedef struct { unsigned long pmd; } pmd_t;
 176 #ifdef CONFIG_PGTABLE_4
 177   typedef struct { unsigned long pud; } pud_t;
 178 #endif
 179   typedef struct { unsigned long pgd; } pgd_t;
 180   typedef struct { unsigned long pgprot; } pgprot_t;
 181   typedef struct page *pgtable_t;
 182
 183 # define pte_val(x)     ((x).pte)
 184 # define pmd_val(x)     ((x).pmd)
 185 #ifdef CONFIG_PGTABLE_4
 186 # define pud_val(x)     ((x).pud)
 187 #endif
 188 # define pgd_val(x)     ((x).pgd)
 189 # define pgprot_val(x)  ((x).pgprot)
 190
 191 # define __pte(x)       ((pte_t) { (x) } )
 192 # define __pmd(x)       ((pmd_t) { (x) } )
 193 # define __pgprot(x)    ((pgprot_t) { (x) } )
 194
 195 #else /* !STRICT_MM_TYPECHECKS */
 196   /*
 197    * .. while these make it easier on the compiler
 198    */
 199 # ifndef __ASSEMBLY__
 200     typedef unsigned long pte_t;
 201     typedef unsigned long pmd_t;
 202     typedef unsigned long pgd_t;
 203     typedef unsigned long pgprot_t;
 204     typedef struct page *pgtable_t;
 205 # endif
 206
 207 # define pte_val(x)     (x)
 208 # define pmd_val(x)     (x)
 209 # define pgd_val(x)     (x)
 210 # define pgprot_val(x)  (x)
 211
 212 # define __pte(x)       (x)
 213 # define __pgd(x)       (x)
 214 # define __pgprot(x)    (x)
 215 #endif /* !STRICT_MM_TYPECHECKS */
 216
 217 #define PAGE_OFFSET                     RGN_BASE(RGN_KERNEL)
 218
 219 #define VM_DATA_DEFAULT_FLAGS           (VM_READ | VM_WRITE |                                   \
 220                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |                \
 221                                          (((current->personality & READ_IMPLIES_EXEC) != 0)     \
 222                                           ? VM_EXEC : 0))
 223
 224 #define GATE_ADDR               RGN_BASE(RGN_GATE)
 225
 226 /*
 227  * 0xa000000000000000+2*PERCPU_PAGE_SIZE
 228  * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page)
 229  */
 230 #define KERNEL_START             (GATE_ADDR+__IA64_UL_CONST(0x100000000))
 231 #define PERCPU_ADDR             (-PERCPU_PAGE_SIZE)
 232 #define LOAD_OFFSET             (KERNEL_START - KERNEL_TR_PAGE_SIZE)
 233
 234 #endif /* _ASM_IA64_PAGE_H */