include/asm-parisc/page.h

   1 #ifndef _PARISC_PAGE_H
   2 #define _PARISC_PAGE_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/const.h>
   7
   8 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
   9 # define PAGE_SHIFT     12
  10 #elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
  11 # define PAGE_SHIFT     14
  12 #elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
  13 # define PAGE_SHIFT     16
  14 #else
  15 # error "unknown default kernel page size"
  16 #endif
  17 #define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  18 #define PAGE_MASK       (~(PAGE_SIZE-1))
  19
  20
  21 #ifndef __ASSEMBLY__
  22
  23 #include <asm/types.h>
  24 #include <asm/cache.h>
  25
  26 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  27 #define copy_page(to,from)      copy_user_page_asm((void *)(to), (void *)(from))
  28
  29 struct page;
  30
  31 void copy_user_page_asm(void *to, void *from);
  32 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  33                            struct page *pg);
  34 void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
  35
  36 /*
  37  * These are used to make use of C type-checking..
  38  */
  39 #define STRICT_MM_TYPECHECKS
  40 #ifdef STRICT_MM_TYPECHECKS
  41 typedef struct { unsigned long pte;
  42 #if !defined(CONFIG_64BIT)
  43                  unsigned long future_flags;
  44  /* XXX: it's possible to remove future_flags and change BITS_PER_PTE_ENTRY
  45          to 2, but then strangely the identical 32bit kernel boots on a
  46          c3000(pa20), but not any longer on a 715(pa11).
  47          Still investigating... HelgeD.
  48   */
  49 #endif
  50 } pte_t; /* either 32 or 64bit */
  51
  52 /* NOTE: even on 64 bits, these entries are __u32 because we allocate
  53  * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  54 typedef struct { __u32 pmd; } pmd_t;
  55 typedef struct { __u32 pgd; } pgd_t;
  56 typedef struct { unsigned long pgprot; } pgprot_t;
  57
  58 #define pte_val(x)      ((x).pte)
  59 /* These do not work lvalues, so make sure we don't use them as such. */
  60 #define pmd_val(x)      ((x).pmd + 0)
  61 #define pgd_val(x)      ((x).pgd + 0)
  62 #define pgprot_val(x)   ((x).pgprot)
  63
  64 #define __pte(x)        ((pte_t) { (x) } )
  65 #define __pmd(x)        ((pmd_t) { (x) } )
  66 #define __pgd(x)        ((pgd_t) { (x) } )
  67 #define __pgprot(x)     ((pgprot_t) { (x) } )
  68
  69 #define __pmd_val_set(x,n) (x).pmd = (n)
  70 #define __pgd_val_set(x,n) (x).pgd = (n)
  71
  72 #else
  73 /*
  74  * .. while these make it easier on the compiler
  75  */
  76 typedef unsigned long pte_t;
  77 typedef         __u32 pmd_t;
  78 typedef         __u32 pgd_t;
  79 typedef unsigned long pgprot_t;
  80
  81 #define pte_val(x)      (x)
  82 #define pmd_val(x)      (x)
  83 #define pgd_val(x)      (x)
  84 #define pgprot_val(x)   (x)
  85
  86 #define __pte(x)        (x)
  87 #define __pmd(x)        (x)
  88 #define __pgd(x)        (x)
  89 #define __pgprot(x)     (x)
  90
  91 #define __pmd_val_set(x,n) (x) = (n)
  92 #define __pgd_val_set(x,n) (x) = (n)
  93
  94 #endif /* STRICT_MM_TYPECHECKS */
  95
  96
  97 typedef struct __physmem_range {
  98         unsigned long start_pfn;
  99         unsigned long pages;       /* PAGE_SIZE pages */
 100 } physmem_range_t;
 101
 102 extern physmem_range_t pmem_ranges[];
 103 extern int npmem_ranges;
 104
 105 #endif /* !__ASSEMBLY__ */
 106
 107 /* WARNING: The definitions below must match exactly to sizeof(pte_t)
 108  * etc
 109  */
 110 #ifdef CONFIG_64BIT
 111 #define BITS_PER_PTE_ENTRY      3
 112 #define BITS_PER_PMD_ENTRY      2
 113 #define BITS_PER_PGD_ENTRY      2
 114 #else
 115 #define BITS_PER_PTE_ENTRY      3
 116 #define BITS_PER_PMD_ENTRY      2
 117 #define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 118 #endif
 119 #define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 120 #define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 121 #define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 122
 123 /* to align the pointer to the (next) page boundary */
 124 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 125
 126
 127 #define LINUX_GATEWAY_SPACE     0
 128
 129 /* This governs the relationship between virtual and physical addresses.
 130  * If you alter it, make sure to take care of our various fixed mapping
 131  * segments in fixmap.h */
 132 #ifdef CONFIG_64BIT
 133 #define __PAGE_OFFSET   (0x40000000)    /* 1GB */
 134 #else
 135 #define __PAGE_OFFSET   (0x10000000)    /* 256MB */
 136 #endif
 137
 138 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 139
 140 /* The size of the gateway page (we leave lots of room for expansion) */
 141 #define GATEWAY_PAGE_SIZE       0x4000
 142
 143 /* The start of the actual kernel binary---used in vmlinux.lds.S
 144  * Leave some space after __PAGE_OFFSET for detecting kernel null
 145  * ptr derefs */
 146 #define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 147
 148 /* These macros don't work for 64-bit C code -- don't allow in C at all */
 149 #ifdef __ASSEMBLY__
 150 #   define PA(x)        ((x)-__PAGE_OFFSET)
 151 #   define VA(x)        ((x)+__PAGE_OFFSET)
 152 #endif
 153 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 154 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 155
 156 #ifndef CONFIG_DISCONTIGMEM
 157 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 158 #endif /* CONFIG_DISCONTIGMEM */
 159
 160 #ifdef CONFIG_HUGETLB_PAGE
 161 #define HPAGE_SHIFT             22      /* 4MB (is this fixed?) */
 162 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 163 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 164 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 165 #endif
 166
 167 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 168
 169 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 170 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 171
 172 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 173                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 174
 175 #include <asm-generic/memory_model.h>
 176 #include <asm-generic/page.h>
 177
 178 #endif /* __KERNEL__ */
 179
 180 #endif /* _PARISC_PAGE_H */