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 #define PAGE_SHIFT   13
   7
   8 #define PAGE_SIZE    (_AC(1,UL) << PAGE_SHIFT)
   9 #define PAGE_MASK    (~(PAGE_SIZE-1))
  10
  11 /* Flushing for D-cache alias handling is only needed if
  12  * the page size is smaller than 16K.
  13  */
  14 #if PAGE_SHIFT < 14
  15 #define DCACHE_ALIASING_POSSIBLE
  16 #endif
  17
  18 #define HPAGE_SHIFT             23
  19 #define REAL_HPAGE_SHIFT        22
  20
  21 #define REAL_HPAGE_SIZE         (_AC(1,UL) << REAL_HPAGE_SHIFT)
  22
  23 #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
  24 #define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
  25 #define HPAGE_MASK              (~(HPAGE_SIZE - 1UL))
  26 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  27 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  28 #endif
  29
  30 #ifndef __ASSEMBLY__
  31
  32 #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
  33 struct pt_regs;
  34 void hugetlb_setup(struct pt_regs *regs);
  35 #endif
  36
  37 #define WANT_PAGE_VIRTUAL
  38
  39 void _clear_page(void *page);
  40 #define clear_page(X)   _clear_page((void *)(X))
  41 struct page;
  42 void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
  43 #define copy_page(X,Y)  memcpy((void *)(X), (void *)(Y), PAGE_SIZE)
  44 void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *topage);
  45
  46 /* Unlike sparc32, sparc64's parameter passing API is more
  47  * sane in that structures which as small enough are passed
  48  * in registers instead of on the stack.  Thus, setting
  49  * STRICT_MM_TYPECHECKS does not generate worse code so
  50  * let's enable it to get the type checking.
  51  */
  52
  53 #define STRICT_MM_TYPECHECKS
  54
  55 #ifdef STRICT_MM_TYPECHECKS
  56 /* These are used to make use of C type-checking.. */
  57 typedef struct { unsigned long pte; } pte_t;
  58 typedef struct { unsigned long iopte; } iopte_t;
  59 typedef struct { unsigned long pmd; } pmd_t;
  60 typedef struct { unsigned long pgd; } pgd_t;
  61 typedef struct { unsigned long pgprot; } pgprot_t;
  62
  63 #define pte_val(x)      ((x).pte)
  64 #define iopte_val(x)    ((x).iopte)
  65 #define pmd_val(x)      ((x).pmd)
  66 #define pgd_val(x)      ((x).pgd)
  67 #define pgprot_val(x)   ((x).pgprot)
  68
  69 #define __pte(x)        ((pte_t) { (x) } )
  70 #define __iopte(x)      ((iopte_t) { (x) } )
  71 #define __pmd(x)        ((pmd_t) { (x) } )
  72 #define __pgd(x)        ((pgd_t) { (x) } )
  73 #define __pgprot(x)     ((pgprot_t) { (x) } )
  74
  75 #else
  76 /* .. while these make it easier on the compiler */
  77 typedef unsigned long pte_t;
  78 typedef unsigned long iopte_t;
  79 typedef unsigned long pmd_t;
  80 typedef unsigned long pgd_t;
  81 typedef unsigned long pgprot_t;
  82
  83 #define pte_val(x)      (x)
  84 #define iopte_val(x)    (x)
  85 #define pmd_val(x)      (x)
  86 #define pgd_val(x)      (x)
  87 #define pgprot_val(x)   (x)
  88
  89 #define __pte(x)        (x)
  90 #define __iopte(x)      (x)
  91 #define __pmd(x)        (x)
  92 #define __pgd(x)        (x)
  93 #define __pgprot(x)     (x)
  94
  95 #endif /* (STRICT_MM_TYPECHECKS) */
  96
  97 typedef pte_t *pgtable_t;
  98
  99 /* These two values define the virtual address space range in which we
 100  * must forbid 64-bit user processes from making mappings.  It used to
 101  * represent precisely the virtual address space hole present in most
 102  * early sparc64 chips including UltraSPARC-I.  But now it also is
 103  * further constrained by the limits of our page tables, which is
 104  * 43-bits of virtual address.
 105  */
 106 #define SPARC64_VA_HOLE_TOP     _AC(0xfffffc0000000000,UL)
 107 #define SPARC64_VA_HOLE_BOTTOM  _AC(0x0000040000000000,UL)
 108
 109 /* The next two defines specify the actual exclusion region we
 110  * enforce, wherein we use a 4GB red zone on each side of the VA hole.
 111  */
 112 #define VA_EXCLUDE_START (SPARC64_VA_HOLE_BOTTOM - (1UL << 32UL))
 113 #define VA_EXCLUDE_END   (SPARC64_VA_HOLE_TOP + (1UL << 32UL))
 114
 115 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_32BIT) ? \
 116                                  _AC(0x0000000070000000,UL) : \
 117                                  VA_EXCLUDE_END)
 118
 119 #include <asm-generic/memory_model.h>
 120
 121 #define PAGE_OFFSET_BY_BITS(X)  (-(_AC(1,UL) << (X)))
 122 extern unsigned long PAGE_OFFSET;
 123
 124 #endif /* !(__ASSEMBLY__) */
 125
 126 /* The maximum number of physical memory address bits we support, this
 127  * is used to size various tables used to manage kernel TLB misses and
 128  * also the sparsemem code.
 129  */
 130 #define MAX_PHYS_ADDRESS_BITS   47
 131
 132 /* These two shift counts are used when indexing sparc64_valid_addr_bitmap
 133  * and kpte_linear_bitmap.
 134  */
 135 #define ILOG2_4MB               22
 136 #define ILOG2_256MB             28
 137
 138 #ifndef __ASSEMBLY__
 139
 140 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
 141 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
 142
 143 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 144
 145 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
 146
 147 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 148
 149 #define virt_to_phys __pa
 150 #define phys_to_virt __va
 151
 152 #endif /* !(__ASSEMBLY__) */
 153
 154 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 155                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 156
 157 #include <asm-generic/getorder.h>
 158
 159 #endif /* _SPARC64_PAGE_H */