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 #include <linux/config.h>
   7 #include <asm/const.h>
   8
   9 #if defined(CONFIG_SPARC64_PAGE_SIZE_8KB)
  10 #define PAGE_SHIFT   13
  11 #elif defined(CONFIG_SPARC64_PAGE_SIZE_64KB)
  12 #define PAGE_SHIFT   16
  13 #elif defined(CONFIG_SPARC64_PAGE_SIZE_512KB)
  14 #define PAGE_SHIFT   19
  15 #elif defined(CONFIG_SPARC64_PAGE_SIZE_4MB)
  16 #define PAGE_SHIFT   22
  17 #else
  18 #error No page size specified in kernel configuration
  19 #endif
  20
  21 #define PAGE_SIZE    (_AC(1,UL) << PAGE_SHIFT)
  22 #define PAGE_MASK    (~(PAGE_SIZE-1))
  23
  24 /* Flushing for D-cache alias handling is only needed if
  25  * the page size is smaller than 16K.
  26  */
  27 #if PAGE_SHIFT < 14
  28 #define DCACHE_ALIASING_POSSIBLE
  29 #endif
  30
  31 #ifdef __KERNEL__
  32
  33 #ifndef __ASSEMBLY__
  34
  35 extern void _clear_page(void *page);
  36 #define clear_page(X)   _clear_page((void *)(X))
  37 struct page;
  38 extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
  39 #define copy_page(X,Y)  memcpy((void *)(X), (void *)(Y), PAGE_SIZE)
  40 extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *topage);
  41
  42 /* Unlike sparc32, sparc64's parameter passing API is more
  43  * sane in that structures which as small enough are passed
  44  * in registers instead of on the stack.  Thus, setting
  45  * STRICT_MM_TYPECHECKS does not generate worse code so
  46  * let's enable it to get the type checking.
  47  */
  48
  49 #define STRICT_MM_TYPECHECKS
  50
  51 #ifdef STRICT_MM_TYPECHECKS
  52 /* These are used to make use of C type-checking.. */
  53 typedef struct { unsigned long pte; } pte_t;
  54 typedef struct { unsigned long iopte; } iopte_t;
  55 typedef struct { unsigned int pmd; } pmd_t;
  56 typedef struct { unsigned int pgd; } pgd_t;
  57 typedef struct { unsigned long pgprot; } pgprot_t;
  58
  59 #define pte_val(x)      ((x).pte)
  60 #define iopte_val(x)    ((x).iopte)
  61 #define pmd_val(x)      ((x).pmd)
  62 #define pgd_val(x)      ((x).pgd)
  63 #define pgprot_val(x)   ((x).pgprot)
  64
  65 #define __pte(x)        ((pte_t) { (x) } )
  66 #define __iopte(x)      ((iopte_t) { (x) } )
  67 #define __pmd(x)        ((pmd_t) { (x) } )
  68 #define __pgd(x)        ((pgd_t) { (x) } )
  69 #define __pgprot(x)     ((pgprot_t) { (x) } )
  70
  71 #else
  72 /* .. while these make it easier on the compiler */
  73 typedef unsigned long pte_t;
  74 typedef unsigned long iopte_t;
  75 typedef unsigned int pmd_t;
  76 typedef unsigned int pgd_t;
  77 typedef unsigned long pgprot_t;
  78
  79 #define pte_val(x)      (x)
  80 #define iopte_val(x)    (x)
  81 #define pmd_val(x)      (x)
  82 #define pgd_val(x)      (x)
  83 #define pgprot_val(x)   (x)
  84
  85 #define __pte(x)        (x)
  86 #define __iopte(x)      (x)
  87 #define __pmd(x)        (x)
  88 #define __pgd(x)        (x)
  89 #define __pgprot(x)     (x)
  90
  91 #endif /* (STRICT_MM_TYPECHECKS) */
  92
  93 #if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  94 #define HPAGE_SHIFT             22
  95 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
  96 #define HPAGE_SHIFT             19
  97 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  98 #define HPAGE_SHIFT             16
  99 #endif
 100
 101 #ifdef CONFIG_HUGETLB_PAGE
 102 #define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
 103 #define HPAGE_MASK              (~(HPAGE_SIZE - 1UL))
 104 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 105 #define ARCH_HAS_SETCLEAR_HUGE_PTE
 106 #define ARCH_HAS_HUGETLB_PREFAULT_HOOK
 107 #endif
 108
 109 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_32BIT) ? \
 110                                  (_AC(0x0000000070000000,UL)) : (PAGE_OFFSET))
 111
 112 #endif /* !(__ASSEMBLY__) */
 113
 114 /* to align the pointer to the (next) page boundary */
 115 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 116
 117 /* We used to stick this into a hard-coded global register (%g4)
 118  * but that does not make sense anymore.
 119  */
 120 #define PAGE_OFFSET             _AC(0xFFFFF80000000000,UL)
 121
 122 #ifndef __ASSEMBLY__
 123
 124 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
 125 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
 126
 127 /* PFNs are real physical page numbers.  However, mem_map only begins to record
 128  * per-page information starting at pfn_base.  This is to handle systems where
 129  * the first physical page in the machine is at some huge physical address,
 130  * such as 4GB.   This is common on a partitioned E10000, for example.
 131  */
 132 extern struct page *pfn_to_page(unsigned long pfn);
 133 extern unsigned long page_to_pfn(struct page *);
 134
 135 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
 136
 137 #define pfn_valid(pfn)          (((pfn)-(pfn_base)) < max_mapnr)
 138 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 139
 140 #define virt_to_phys __pa
 141 #define phys_to_virt __va
 142
 143 #endif /* !(__ASSEMBLY__) */
 144
 145 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 146                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 147
 148 #endif /* !(__KERNEL__) */
 149
 150 #include <asm-generic/page.h>
 151
 152 #endif /* !(_SPARC64_PAGE_H) */