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Linux/arch/sparc/include/asm/page_64.h

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  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 extern void hugetlb_setup(struct pt_regs *regs);
 35 #endif
 36 
 37 #define WANT_PAGE_VIRTUAL
 38 
 39 extern void _clear_page(void *page);
 40 #define clear_page(X)   _clear_page((void *)(X))
 41 struct page;
 42 extern 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 extern 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 pud; } pud_t;
 61 typedef struct { unsigned long pgd; } pgd_t;
 62 typedef struct { unsigned long pgprot; } pgprot_t;
 63 
 64 #define pte_val(x)      ((x).pte)
 65 #define iopte_val(x)    ((x).iopte)
 66 #define pmd_val(x)      ((x).pmd)
 67 #define pud_val(x)      ((x).pud)
 68 #define pgd_val(x)      ((x).pgd)
 69 #define pgprot_val(x)   ((x).pgprot)
 70 
 71 #define __pte(x)        ((pte_t) { (x) } )
 72 #define __iopte(x)      ((iopte_t) { (x) } )
 73 #define __pmd(x)        ((pmd_t) { (x) } )
 74 #define __pud(x)        ((pud_t) { (x) } )
 75 #define __pgd(x)        ((pgd_t) { (x) } )
 76 #define __pgprot(x)     ((pgprot_t) { (x) } )
 77 
 78 #else
 79 /* .. while these make it easier on the compiler */
 80 typedef unsigned long pte_t;
 81 typedef unsigned long iopte_t;
 82 typedef unsigned long pmd_t;
 83 typedef unsigned long pud_t;
 84 typedef unsigned long 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 pud_val(x)      (x)
 91 #define pgd_val(x)      (x)
 92 #define pgprot_val(x)   (x)
 93 
 94 #define __pte(x)        (x)
 95 #define __iopte(x)      (x)
 96 #define __pmd(x)        (x)
 97 #define __pud(x)        (x)
 98 #define __pgd(x)        (x)
 99 #define __pgprot(x)     (x)
100 
101 #endif /* (STRICT_MM_TYPECHECKS) */
102 
103 typedef pte_t *pgtable_t;
104 
105 extern unsigned long sparc64_va_hole_top;
106 extern unsigned long sparc64_va_hole_bottom;
107 
108 /* The next two defines specify the actual exclusion region we
109  * enforce, wherein we use a 4GB red zone on each side of the VA hole.
110  */
111 #define VA_EXCLUDE_START (sparc64_va_hole_bottom - (1UL << 32UL))
112 #define VA_EXCLUDE_END   (sparc64_va_hole_top + (1UL << 32UL))
113 
114 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_32BIT) ? \
115                                  _AC(0x0000000070000000,UL) : \
116                                  VA_EXCLUDE_END)
117 
118 #include <asm-generic/memory_model.h>
119 
120 extern unsigned long PAGE_OFFSET;
121 
122 #endif /* !(__ASSEMBLY__) */
123 
124 /* The maximum number of physical memory address bits we support.  The
125  * largest value we can support is whatever "KPGD_SHIFT + KPTE_BITS"
126  * evaluates to.
127  */
128 #define MAX_PHYS_ADDRESS_BITS   53
129 
130 #define ILOG2_4MB               22
131 #define ILOG2_256MB             28
132 
133 #ifndef __ASSEMBLY__
134 
135 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
136 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
137 
138 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
139 
140 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
141 
142 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
143 
144 #define virt_to_phys __pa
145 #define phys_to_virt __va
146 
147 #endif /* !(__ASSEMBLY__) */
148 
149 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
150                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
151 
152 #include <asm-generic/getorder.h>
153 
154 #endif /* _SPARC64_PAGE_H */
155 

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