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