include/asm-sparc64/page.h

   1 /* $Id: page.h,v 1.39 2002/02/09 19:49:31 davem Exp $ */
   2
   3 #ifndef _SPARC64_PAGE_H
   4 #define _SPARC64_PAGE_H
   5
   6 #ifdef __KERNEL__
   7
   8 #include <asm/const.h>
   9
  10 #if defined(CONFIG_SPARC64_PAGE_SIZE_8KB)
  11 #define PAGE_SHIFT   13
  12 #elif defined(CONFIG_SPARC64_PAGE_SIZE_64KB)
  13 #define PAGE_SHIFT   16
  14 #elif defined(CONFIG_SPARC64_PAGE_SIZE_512KB)
  15 #define PAGE_SHIFT   19
  16 #elif defined(CONFIG_SPARC64_PAGE_SIZE_4MB)
  17 #define PAGE_SHIFT   22
  18 #else
  19 #error No page size specified in kernel configuration
  20 #endif
  21
  22 #define PAGE_SIZE    (_AC(1,UL) << PAGE_SHIFT)
  23 #define PAGE_MASK    (~(PAGE_SIZE-1))
  24
  25 /* Flushing for D-cache alias handling is only needed if
  26  * the page size is smaller than 16K.
  27  */
  28 #if PAGE_SHIFT < 14
  29 #define DCACHE_ALIASING_POSSIBLE
  30 #endif
  31
  32 #if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  33 #define HPAGE_SHIFT             22
  34 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
  35 #define HPAGE_SHIFT             19
  36 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  37 #define HPAGE_SHIFT             16
  38 #endif
  39
  40 #ifdef CONFIG_HUGETLB_PAGE
  41 #define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
  42 #define HPAGE_MASK              (~(HPAGE_SIZE - 1UL))
  43 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  44 #define ARCH_HAS_SETCLEAR_HUGE_PTE
  45 #define ARCH_HAS_HUGETLB_PREFAULT_HOOK
  46 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  47 #endif
  48
  49 #ifndef __ASSEMBLY__
  50
  51 extern void _clear_page(void *page);
  52 #define clear_page(X)   _clear_page((void *)(X))
  53 struct page;
  54 extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
  55 #define copy_page(X,Y)  memcpy((void *)(X), (void *)(Y), PAGE_SIZE)
  56 extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *topage);
  57
  58 /* Unlike sparc32, sparc64's parameter passing API is more
  59  * sane in that structures which as small enough are passed
  60  * in registers instead of on the stack.  Thus, setting
  61  * STRICT_MM_TYPECHECKS does not generate worse code so
  62  * let's enable it to get the type checking.
  63  */
  64
  65 #define STRICT_MM_TYPECHECKS
  66
  67 #ifdef STRICT_MM_TYPECHECKS
  68 /* These are used to make use of C type-checking.. */
  69 typedef struct { unsigned long pte; } pte_t;
  70 typedef struct { unsigned long iopte; } iopte_t;
  71 typedef struct { unsigned int pmd; } pmd_t;
  72 typedef struct { unsigned int pgd; } pgd_t;
  73 typedef struct { unsigned long pgprot; } pgprot_t;
  74
  75 #define pte_val(x)      ((x).pte)
  76 #define iopte_val(x)    ((x).iopte)
  77 #define pmd_val(x)      ((x).pmd)
  78 #define pgd_val(x)      ((x).pgd)
  79 #define pgprot_val(x)   ((x).pgprot)
  80
  81 #define __pte(x)        ((pte_t) { (x) } )
  82 #define __iopte(x)      ((iopte_t) { (x) } )
  83 #define __pmd(x)        ((pmd_t) { (x) } )
  84 #define __pgd(x)        ((pgd_t) { (x) } )
  85 #define __pgprot(x)     ((pgprot_t) { (x) } )
  86
  87 #else
  88 /* .. while these make it easier on the compiler */
  89 typedef unsigned long pte_t;
  90 typedef unsigned long iopte_t;
  91 typedef unsigned int pmd_t;
  92 typedef unsigned int pgd_t;
  93 typedef unsigned long pgprot_t;
  94
  95 #define pte_val(x)      (x)
  96 #define iopte_val(x)    (x)
  97 #define pmd_val(x)      (x)
  98 #define pgd_val(x)      (x)
  99 #define pgprot_val(x)   (x)
 100
 101 #define __pte(x)        (x)
 102 #define __iopte(x)      (x)
 103 #define __pmd(x)        (x)
 104 #define __pgd(x)        (x)
 105 #define __pgprot(x)     (x)
 106
 107 #endif /* (STRICT_MM_TYPECHECKS) */
 108
 109 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_32BIT) ? \
 110                                  (_AC(0x0000000070000000,UL)) : \
 111                                  (_AC(0xfffff80000000000,UL) + (1UL << 32UL)))
 112
 113 #include <asm-generic/memory_model.h>
 114
 115 #endif /* !(__ASSEMBLY__) */
 116
 117 /* to align the pointer to the (next) page boundary */
 118 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 119
 120 /* We used to stick this into a hard-coded global register (%g4)
 121  * but that does not make sense anymore.
 122  */
 123 #define PAGE_OFFSET             _AC(0xFFFFF80000000000,UL)
 124
 125 #ifndef __ASSEMBLY__
 126
 127 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
 128 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
 129
 130 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 131
 132 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
 133
 134 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 135
 136 #define virt_to_phys __pa
 137 #define phys_to_virt __va
 138
 139 #endif /* !(__ASSEMBLY__) */
 140
 141 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 142                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 143
 144 #include <asm-generic/page.h>
 145
 146 #endif /* __KERNEL__ */
 147 #endif /* _SPARC64_PAGE_H */