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 void clear_user_page(void *vto, unsigned long vaddr, struct page *pg);
  32 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  33                            struct page *pg);
  34
  35 /* #define CONFIG_PARISC_TMPALIAS */
  36
  37 #ifdef CONFIG_PARISC_TMPALIAS
  38 void clear_user_highpage(struct page *page, unsigned long vaddr);
  39 #define clear_user_highpage clear_user_highpage
  40 struct vm_area_struct;
  41 void copy_user_highpage(struct page *to, struct page *from,
  42         unsigned long vaddr, struct vm_area_struct *vma);
  43 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  44 #endif
  45
  46 /*
  47  * These are used to make use of C type-checking..
  48  */
  49 #define STRICT_MM_TYPECHECKS
  50 #ifdef STRICT_MM_TYPECHECKS
  51 typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
  52
  53 /* NOTE: even on 64 bits, these entries are __u32 because we allocate
  54  * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  55 typedef struct { __u32 pmd; } pmd_t;
  56 typedef struct { __u32 pgd; } pgd_t;
  57 typedef struct { unsigned long pgprot; } pgprot_t;
  58
  59 #define pte_val(x)      ((x).pte)
  60 /* These do not work lvalues, so make sure we don't use them as such. */
  61 #define pmd_val(x)      ((x).pmd + 0)
  62 #define pgd_val(x)      ((x).pgd + 0)
  63 #define pgprot_val(x)   ((x).pgprot)
  64
  65 #define __pte(x)        ((pte_t) { (x) } )
  66 #define __pmd(x)        ((pmd_t) { (x) } )
  67 #define __pgd(x)        ((pgd_t) { (x) } )
  68 #define __pgprot(x)     ((pgprot_t) { (x) } )
  69
  70 #define __pmd_val_set(x,n) (x).pmd = (n)
  71 #define __pgd_val_set(x,n) (x).pgd = (n)
  72
  73 #else
  74 /*
  75  * .. while these make it easier on the compiler
  76  */
  77 typedef unsigned long pte_t;
  78 typedef         __u32 pmd_t;
  79 typedef         __u32 pgd_t;
  80 typedef unsigned long pgprot_t;
  81
  82 #define pte_val(x)      (x)
  83 #define pmd_val(x)      (x)
  84 #define pgd_val(x)      (x)
  85 #define pgprot_val(x)   (x)
  86
  87 #define __pte(x)        (x)
  88 #define __pmd(x)        (x)
  89 #define __pgd(x)        (x)
  90 #define __pgprot(x)     (x)
  91
  92 #define __pmd_val_set(x,n) (x) = (n)
  93 #define __pgd_val_set(x,n) (x) = (n)
  94
  95 #endif /* STRICT_MM_TYPECHECKS */
  96
  97 typedef struct page *pgtable_t;
  98
  99 typedef struct __physmem_range {
 100         unsigned long start_pfn;
 101         unsigned long pages;       /* PAGE_SIZE pages */
 102 } physmem_range_t;
 103
 104 extern physmem_range_t pmem_ranges[];
 105 extern int npmem_ranges;
 106
 107 #endif /* !__ASSEMBLY__ */
 108
 109 /* WARNING: The definitions below must match exactly to sizeof(pte_t)
 110  * etc
 111  */
 112 #ifdef CONFIG_64BIT
 113 #define BITS_PER_PTE_ENTRY      3
 114 #define BITS_PER_PMD_ENTRY      2
 115 #define BITS_PER_PGD_ENTRY      2
 116 #else
 117 #define BITS_PER_PTE_ENTRY      2
 118 #define BITS_PER_PMD_ENTRY      2
 119 #define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 120 #endif
 121 #define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 122 #define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 123 #define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 124
 125 #define LINUX_GATEWAY_SPACE     0
 126
 127 /* This governs the relationship between virtual and physical addresses.
 128  * If you alter it, make sure to take care of our various fixed mapping
 129  * segments in fixmap.h */
 130 #ifdef CONFIG_64BIT
 131 #define __PAGE_OFFSET   (0x40000000)    /* 1GB */
 132 #else
 133 #define __PAGE_OFFSET   (0x10000000)    /* 256MB */
 134 #endif
 135
 136 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 137
 138 /* The size of the gateway page (we leave lots of room for expansion) */
 139 #define GATEWAY_PAGE_SIZE       0x4000
 140
 141 /* The start of the actual kernel binary---used in vmlinux.lds.S
 142  * Leave some space after __PAGE_OFFSET for detecting kernel null
 143  * ptr derefs */
 144 #define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 145
 146 /* These macros don't work for 64-bit C code -- don't allow in C at all */
 147 #ifdef __ASSEMBLY__
 148 #   define PA(x)        ((x)-__PAGE_OFFSET)
 149 #   define VA(x)        ((x)+__PAGE_OFFSET)
 150 #endif
 151 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 152 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 153
 154 #ifndef CONFIG_DISCONTIGMEM
 155 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 156 #endif /* CONFIG_DISCONTIGMEM */
 157
 158 #ifdef CONFIG_HUGETLB_PAGE
 159 #define HPAGE_SHIFT             22      /* 4MB (is this fixed?) */
 160 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 161 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 162 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 163 #endif
 164
 165 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 166
 167 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 168 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 169
 170 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 171                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 172
 173 #include <asm-generic/memory_model.h>
 174 #include <asm-generic/getorder.h>
 175 #include <asm/pdc.h>
 176
 177 #define PAGE0   ((struct zeropage *)__PAGE_OFFSET)
 178
 179 /* DEFINITION OF THE ZERO-PAGE (PAG0) */
 180 /* based on work by Jason Eckhardt (jason@equator.com) */
 181
 182 #endif /* _PARISC_PAGE_H */