release/src-rt-6.x.4708/linux/linux-2.6.36/arch/parisc/include/asm/page.h

   1 #ifndef _PARISC_PAGE_H
   2 #define _PARISC_PAGE_H
   3
   4 #include <linux/const.h>
   5
   6 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
   7 # define PAGE_SHIFT     12
   8 #elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
   9 # define PAGE_SHIFT     14
  10 #elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
  11 # define PAGE_SHIFT     16
  12 #else
  13 # error "unknown default kernel page size"
  14 #endif
  15 #define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  16 #define PAGE_MASK       (~(PAGE_SIZE-1))
  17
  18
  19 #ifndef __ASSEMBLY__
  20
  21 #include <asm/types.h>
  22 #include <asm/cache.h>
  23
  24 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  25 #define copy_page(to,from)      copy_user_page_asm((void *)(to), (void *)(from))
  26
  27 struct page;
  28
  29 void copy_user_page_asm(void *to, void *from);
  30 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  31                            struct page *pg);
  32 void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
  33
  34 /*
  35  * These are used to make use of C type-checking..
  36  */
  37 #define STRICT_MM_TYPECHECKS
  38 #ifdef STRICT_MM_TYPECHECKS
  39 typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
  40
  41 /* NOTE: even on 64 bits, these entries are __u32 because we allocate
  42  * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  43 typedef struct { __u32 pmd; } pmd_t;
  44 typedef struct { __u32 pgd; } pgd_t;
  45 typedef struct { unsigned long pgprot; } pgprot_t;
  46
  47 #define pte_val(x)      ((x).pte)
  48 /* These do not work lvalues, so make sure we don't use them as such. */
  49 #define pmd_val(x)      ((x).pmd + 0)
  50 #define pgd_val(x)      ((x).pgd + 0)
  51 #define pgprot_val(x)   ((x).pgprot)
  52
  53 #define __pte(x)        ((pte_t) { (x) } )
  54 #define __pmd(x)        ((pmd_t) { (x) } )
  55 #define __pgd(x)        ((pgd_t) { (x) } )
  56 #define __pgprot(x)     ((pgprot_t) { (x) } )
  57
  58 #define __pmd_val_set(x,n) (x).pmd = (n)
  59 #define __pgd_val_set(x,n) (x).pgd = (n)
  60
  61 #else
  62 /*
  63  * .. while these make it easier on the compiler
  64  */
  65 typedef unsigned long pte_t;
  66 typedef         __u32 pmd_t;
  67 typedef         __u32 pgd_t;
  68 typedef unsigned long pgprot_t;
  69
  70 #define pte_val(x)      (x)
  71 #define pmd_val(x)      (x)
  72 #define pgd_val(x)      (x)
  73 #define pgprot_val(x)   (x)
  74
  75 #define __pte(x)        (x)
  76 #define __pmd(x)        (x)
  77 #define __pgd(x)        (x)
  78 #define __pgprot(x)     (x)
  79
  80 #define __pmd_val_set(x,n) (x) = (n)
  81 #define __pgd_val_set(x,n) (x) = (n)
  82
  83 #endif /* STRICT_MM_TYPECHECKS */
  84
  85 typedef struct page *pgtable_t;
  86
  87 typedef struct __physmem_range {
  88         unsigned long start_pfn;
  89         unsigned long pages;       /* PAGE_SIZE pages */
  90 } physmem_range_t;
  91
  92 extern physmem_range_t pmem_ranges[];
  93 extern int npmem_ranges;
  94
  95 #endif /* !__ASSEMBLY__ */
  96
  97 /* WARNING: The definitions below must match exactly to sizeof(pte_t)
  98  * etc
  99  */
 100 #ifdef CONFIG_64BIT
 101 #define BITS_PER_PTE_ENTRY      3
 102 #define BITS_PER_PMD_ENTRY      2
 103 #define BITS_PER_PGD_ENTRY      2
 104 #else
 105 #define BITS_PER_PTE_ENTRY      2
 106 #define BITS_PER_PMD_ENTRY      2
 107 #define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 108 #endif
 109 #define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 110 #define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 111 #define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 112
 113 #define LINUX_GATEWAY_SPACE     0
 114
 115 /* This governs the relationship between virtual and physical addresses.
 116  * If you alter it, make sure to take care of our various fixed mapping
 117  * segments in fixmap.h */
 118 #ifdef CONFIG_64BIT
 119 #define __PAGE_OFFSET   (0x40000000)    /* 1GB */
 120 #else
 121 #define __PAGE_OFFSET   (0x10000000)    /* 256MB */
 122 #endif
 123
 124 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 125
 126 /* The size of the gateway page (we leave lots of room for expansion) */
 127 #define GATEWAY_PAGE_SIZE       0x4000
 128
 129 /* The start of the actual kernel binary---used in vmlinux.lds.S
 130  * Leave some space after __PAGE_OFFSET for detecting kernel null
 131  * ptr derefs */
 132 #define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 133
 134 /* These macros don't work for 64-bit C code -- don't allow in C at all */
 135 #ifdef __ASSEMBLY__
 136 #   define PA(x)        ((x)-__PAGE_OFFSET)
 137 #   define VA(x)        ((x)+__PAGE_OFFSET)
 138 #endif
 139 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 140 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 141
 142 #ifndef CONFIG_DISCONTIGMEM
 143 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 144 #endif /* CONFIG_DISCONTIGMEM */
 145
 146 #ifdef CONFIG_HUGETLB_PAGE
 147 #define HPAGE_SHIFT             22      /* 4MB (is this fixed?) */
 148 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 149 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 150 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 151 #endif
 152
 153 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 154
 155 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 156 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 157
 158 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 159                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 160
 161 #include <asm-generic/memory_model.h>
 162 #include <asm-generic/getorder.h>
 163
 164 #endif /* _PARISC_PAGE_H */