LXR linux/arch/sparc/include/asm/page

   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
  43extern void _clear_page(void *page);
  44#define clear_page(X)   _clear_page((void *)(X))
  45struct page;
  46extern 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)
  48extern 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.. */
  61typedef struct { unsigned long pte; } pte_t;
  62typedef struct { unsigned long iopte; } iopte_t;
  63typedef struct { unsigned int pmd; } pmd_t;
  64typedef struct { unsigned int pgd; } pgd_t;
  65typedef 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 */
  81typedef unsigned long pte_t;
  82typedef unsigned long iopte_t;
  83typedef unsigned int pmd_t;
  84typedef unsigned int pgd_t;
  85typedef 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
 101typedef 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 */
 138