release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sparc/include/asm/page_64.h

   1 #ifndef _SPARC64_PAGE_H
   2 #define _SPARC64_PAGE_H
   3
   4 #include <linux/const.h>
   5
   6 #if defined(CONFIG_SPARC64_PAGE_SIZE_8KB)
   7 #define PAGE_SHIFT   13
   8 #elif defined(CONFIG_SPARC64_PAGE_SIZE_64KB)
   9 #define PAGE_SHIFT   16
  10 #else
  11 #error No page size specified in kernel configuration
  12 #endif
  13
  14 #define PAGE_SIZE    (_AC(1,UL) << PAGE_SHIFT)
  15 #define PAGE_MASK    (~(PAGE_SIZE-1))
  16
  17 /* Flushing for D-cache alias handling is only needed if
  18  * the page size is smaller than 16K.
  19  */
  20 #if PAGE_SHIFT < 14
  21 #define DCACHE_ALIASING_POSSIBLE
  22 #endif
  23
  24 #if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  25 #define HPAGE_SHIFT             22
  26 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
  27 #define HPAGE_SHIFT             19
  28 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  29 #define HPAGE_SHIFT             16
  30 #endif
  31
  32 #ifdef CONFIG_HUGETLB_PAGE
  33 #define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
  34 #define HPAGE_MASK              (~(HPAGE_SIZE - 1UL))
  35 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  36 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  37 #endif
  38
  39 #ifndef __ASSEMBLY__
  40
  41 #define WANT_PAGE_VIRTUAL
  42
  43 extern void _clear_page(void *page);
  44 #define clear_page(X)   _clear_page((void *)(X))
  45 struct page;
  46 extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
  47 #define copy_page(X,Y)  memcpy((void *)(X), (void *)(Y), PAGE_SIZE)
  48 extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *topage);
  49
  50 /* Unlike sparc32, sparc64's parameter passing API is more
  51  * sane in that structures which as small enough are passed
  52  * in registers instead of on the stack.  Thus, setting
  53  * STRICT_MM_TYPECHECKS does not generate worse code so
  54  * let's enable it to get the type checking.
  55  */
  56
  57 #define STRICT_MM_TYPECHECKS
  58
  59 #ifdef STRICT_MM_TYPECHECKS
  60 /* These are used to make use of C type-checking.. */
  61 typedef struct { unsigned long pte; } pte_t;
  62 typedef struct { unsigned long iopte; } iopte_t;
  63 typedef struct { unsigned int pmd; } pmd_t;
  64 typedef struct { unsigned int pgd; } pgd_t;
  65 typedef struct { unsigned long pgprot; } pgprot_t;
  66
  67 #define pte_val(x)      ((x).pte)
  68 #define iopte_val(x)    ((x).iopte)
  69 #define pmd_val(x)      ((x).pmd)
  70 #define pgd_val(x)      ((x).pgd)
  71 #define pgprot_val(x)   ((x).pgprot)
  72
  73 #define __pte(x)        ((pte_t) { (x) } )
  74 #define __iopte(x)      ((iopte_t) { (x) } )
  75 #define __pmd(x)        ((pmd_t) { (x) } )
  76 #define __pgd(x)        ((pgd_t) { (x) } )
  77 #define __pgprot(x)     ((pgprot_t) { (x) } )
  78
  79 #else
  80 /* .. while these make it easier on the compiler */
  81 typedef unsigned long pte_t;
  82 typedef unsigned long iopte_t;
  83 typedef unsigned int pmd_t;
  84 typedef unsigned int pgd_t;
  85 typedef unsigned long pgprot_t;
  86
  87 #define pte_val(x)      (x)
  88 #define iopte_val(x)    (x)
  89 #define pmd_val(x)      (x)
  90 #define pgd_val(x)      (x)
  91 #define pgprot_val(x)   (x)
  92
  93 #define __pte(x)        (x)
  94 #define __iopte(x)      (x)
  95 #define __pmd(x)        (x)
  96 #define __pgd(x)        (x)
  97 #define __pgprot(x)     (x)
  98
  99 #endif /* (STRICT_MM_TYPECHECKS) */
 100
 101 typedef struct page *pgtable_t;
 102
 103 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_32BIT) ? \
 104                                  (_AC(0x0000000070000000,UL)) : \
 105                                  (_AC(0xfffff80000000000,UL) + (1UL << 32UL)))
 106
 107 #include <asm-generic/memory_model.h>
 108
 109 #endif /* !(__ASSEMBLY__) */
 110
 111 /* We used to stick this into a hard-coded global register (%g4)
 112  * but that does not make sense anymore.
 113  */
 114 #define PAGE_OFFSET             _AC(0xFFFFF80000000000,UL)
 115
 116 #ifndef __ASSEMBLY__
 117
 118 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
 119 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
 120
 121 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 122
 123 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
 124
 125 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 126
 127 #define virt_to_phys __pa
 128 #define phys_to_virt __va
 129
 130 #endif /* !(__ASSEMBLY__) */
 131
 132 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 133                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 134
 135 #include <asm-generic/getorder.h>
 136
 137 #endif /* _SPARC64_PAGE_H */