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)        clear_page_asm((void *)(page))
  25 #define copy_page(to, from)     copy_page_asm((void *)(to), (void *)(from))
  26
  27 struct page;
  28
  29 void clear_page_asm(void *page);
  30 void copy_page_asm(void *to, void *from);
  31 #define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
  32 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  33                         struct page *pg);
  34
  35 /*
  36  * These are used to make use of C type-checking..
  37  */
  38 #define STRICT_MM_TYPECHECKS
  39 #ifdef STRICT_MM_TYPECHECKS
  40 typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
  41
  42 /* NOTE: even on 64 bits, these entries are __u32 because we allocate
  43  * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  44 typedef struct { __u32 pmd; } pmd_t;
  45 typedef struct { __u32 pgd; } pgd_t;
  46 typedef struct { unsigned long pgprot; } pgprot_t;
  47
  48 #define pte_val(x)      ((x).pte)
  49 /* These do not work lvalues, so make sure we don't use them as such. */
  50 #define pmd_val(x)      ((x).pmd + 0)
  51 #define pgd_val(x)      ((x).pgd + 0)
  52 #define pgprot_val(x)   ((x).pgprot)
  53
  54 #define __pte(x)        ((pte_t) { (x) } )
  55 #define __pmd(x)        ((pmd_t) { (x) } )
  56 #define __pgd(x)        ((pgd_t) { (x) } )
  57 #define __pgprot(x)     ((pgprot_t) { (x) } )
  58
  59 #define __pmd_val_set(x,n) (x).pmd = (n)
  60 #define __pgd_val_set(x,n) (x).pgd = (n)
  61
  62 #else
  63 /*
  64  * .. while these make it easier on the compiler
  65  */
  66 typedef unsigned long pte_t;
  67 typedef         __u32 pmd_t;
  68 typedef         __u32 pgd_t;
  69 typedef unsigned long pgprot_t;
  70
  71 #define pte_val(x)      (x)
  72 #define pmd_val(x)      (x)
  73 #define pgd_val(x)      (x)
  74 #define pgprot_val(x)   (x)
  75
  76 #define __pte(x)        (x)
  77 #define __pmd(x)        (x)
  78 #define __pgd(x)        (x)
  79 #define __pgprot(x)     (x)
  80
  81 #define __pmd_val_set(x,n) (x) = (n)
  82 #define __pgd_val_set(x,n) (x) = (n)
  83
  84 #endif /* STRICT_MM_TYPECHECKS */
  85
  86 typedef struct page *pgtable_t;
  87
  88 typedef struct __physmem_range {
  89         unsigned long start_pfn;
  90         unsigned long pages;       /* PAGE_SIZE pages */
  91 } physmem_range_t;
  92
  93 extern physmem_range_t pmem_ranges[];
  94 extern int npmem_ranges;
  95
  96 #endif /* !__ASSEMBLY__ */
  97
  98 /* WARNING: The definitions below must match exactly to sizeof(pte_t)
  99  * etc
 100  */
 101 #ifdef CONFIG_64BIT
 102 #define BITS_PER_PTE_ENTRY      3
 103 #define BITS_PER_PMD_ENTRY      2
 104 #define BITS_PER_PGD_ENTRY      2
 105 #else
 106 #define BITS_PER_PTE_ENTRY      2
 107 #define BITS_PER_PMD_ENTRY      2
 108 #define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 109 #endif
 110 #define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 111 #define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 112 #define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 113
 114 #define LINUX_GATEWAY_SPACE     0
 115
 116 /* This governs the relationship between virtual and physical addresses.
 117  * If you alter it, make sure to take care of our various fixed mapping
 118  * segments in fixmap.h */
 119 #ifdef CONFIG_64BIT
 120 #define __PAGE_OFFSET   (0x40000000)    /* 1GB */
 121 #else
 122 #define __PAGE_OFFSET   (0x10000000)    /* 256MB */
 123 #endif
 124
 125 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 126
 127 /* The size of the gateway page (we leave lots of room for expansion) */
 128 #define GATEWAY_PAGE_SIZE       0x4000
 129
 130 /* The start of the actual kernel binary---used in vmlinux.lds.S
 131  * Leave some space after __PAGE_OFFSET for detecting kernel null
 132  * ptr derefs */
 133 #define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 134
 135 /* These macros don't work for 64-bit C code -- don't allow in C at all */
 136 #ifdef __ASSEMBLY__
 137 #   define PA(x)        ((x)-__PAGE_OFFSET)
 138 #   define VA(x)        ((x)+__PAGE_OFFSET)
 139 #endif
 140 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 141 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 142
 143 #ifndef CONFIG_DISCONTIGMEM
 144 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 145 #endif /* CONFIG_DISCONTIGMEM */
 146
 147 #ifdef CONFIG_HUGETLB_PAGE
 148 #define HPAGE_SHIFT             22      /* 4MB (is this fixed?) */
 149 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 150 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 151 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 152 #endif
 153
 154 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 155
 156 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 157 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 158
 159 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 160                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 161
 162 #include <asm-generic/memory_model.h>
 163 #include <asm-generic/getorder.h>
 164 #include <asm/pdc.h>
 165
 166 #define PAGE0   ((struct zeropage *)__PAGE_OFFSET)
 167
 168 /* DEFINITION OF THE ZERO-PAGE (PAG0) */
 169 /* based on work by Jason Eckhardt (jason@equator.com) */
 170
 171 #endif /* _PARISC_PAGE_H */