include/asm-parisc/page.h

   1 #ifndef _PARISC_PAGE_H
   2 #define _PARISC_PAGE_H
   3
   4 /* PAGE_SHIFT determines the page size */
   5 #define PAGE_SHIFT      12
   6 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
   7 #define PAGE_MASK       (~(PAGE_SIZE-1))
   8
   9 #ifdef __KERNEL__
  10 #include <linux/config.h>
  11 #ifndef __ASSEMBLY__
  12
  13 #include <asm/types.h>
  14 #include <asm/cache.h>
  15
  16 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  17 #define copy_page(to,from)      copy_user_page_asm((void *)(to), (void *)(from))
  18
  19 struct page;
  20
  21 extern void purge_kernel_dcache_page(unsigned long);
  22 extern void copy_user_page_asm(void *to, void *from);
  23 extern void clear_user_page_asm(void *page, unsigned long vaddr);
  24
  25 static inline void
  26 copy_user_page(void *vto, void *vfrom, unsigned long vaddr, struct page *pg)
  27 {
  28         copy_user_page_asm(vto, vfrom);
  29         flush_kernel_dcache_page(vto);
  30         /* XXX: ppc flushes icache too, should we? */
  31 }
  32
  33 static inline void
  34 clear_user_page(void *page, unsigned long vaddr, struct page *pg)
  35 {
  36         purge_kernel_dcache_page((unsigned long)page);
  37         clear_user_page_asm(page, vaddr);
  38 }
  39
  40 /*
  41  * These are used to make use of C type-checking..
  42  */
  43 #ifdef __LP64__
  44 typedef struct { unsigned long pte; } pte_t;
  45 #else
  46 typedef struct {
  47         unsigned long pte;
  48         unsigned long flags;
  49 } pte_t;
  50 #endif
  51 /* NOTE: even on 64 bits, these entries are __u32 because we allocate
  52  * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  53 typedef struct { __u32 pmd; } pmd_t;
  54 typedef struct { __u32 pgd; } pgd_t;
  55 typedef struct { unsigned long pgprot; } pgprot_t;
  56
  57 #define pte_val(x)      ((x).pte)
  58 #ifdef __LP64__
  59 #define pte_flags(x)    (*(__u32 *)&((x).pte))
  60 #else
  61 #define pte_flags(x)    ((x).flags)
  62 #endif
  63
  64 /* These do not work lvalues, so make sure we don't use them as such. */
  65 #define pmd_val(x)      ((x).pmd + 0)
  66 #define pgd_val(x)      ((x).pgd + 0)
  67 #define pgprot_val(x)   ((x).pgprot)
  68
  69 #define __pmd_val_set(x,n) (x).pmd = (n)
  70 #define __pgd_val_set(x,n) (x).pgd = (n)
  71
  72 #define __pte(x)        ((pte_t) { (x) } )
  73 #define __pmd(x)        ((pmd_t) { (x) } )
  74 #define __pgd(x)        ((pgd_t) { (x) } )
  75 #define __pgprot(x)     ((pgprot_t) { (x) } )
  76
  77 /* Pure 2^n version of get_order */
  78 extern __inline__ int get_order(unsigned long size)
  79 {
  80         int order;
  81
  82         size = (size-1) >> (PAGE_SHIFT-1);
  83         order = -1;
  84         do {
  85                 size >>= 1;
  86                 order++;
  87         } while (size);
  88         return order;
  89 }
  90
  91 typedef struct __physmem_range {
  92         unsigned long start_pfn;
  93         unsigned long pages;       /* PAGE_SIZE pages */
  94 } physmem_range_t;
  95
  96 extern physmem_range_t pmem_ranges[];
  97 extern int npmem_ranges;
  98
  99 #endif /* !__ASSEMBLY__ */
 100
 101 /* WARNING: The definitions below must match exactly to sizeof(pte_t)
 102  * etc
 103  */
 104 #ifdef __LP64__
 105 #define BITS_PER_PTE_ENTRY      3
 106 #define BITS_PER_PMD_ENTRY      2
 107 #define BITS_PER_PGD_ENTRY      2
 108 #else
 109 #define BITS_PER_PTE_ENTRY      3
 110 #define BITS_PER_PMD_ENTRY      2
 111 #define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 112 #endif
 113 #define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 114 #define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 115 #define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 116
 117 /* to align the pointer to the (next) page boundary */
 118 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 119
 120
 121 #define LINUX_GATEWAY_SPACE     0
 122
 123 /* This governs the relationship between virtual and physical addresses.
 124  * If you alter it, make sure to take care of our various fixed mapping
 125  * segments in fixmap.h */
 126 #define __PAGE_OFFSET           (0x10000000)
 127
 128 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 129
 130 /* The size of the gateway page (we leave lots of room for expansion) */
 131 #define GATEWAY_PAGE_SIZE       0x4000
 132
 133 /* The start of the actual kernel binary---used in vmlinux.lds.S
 134  * Leave some space after __PAGE_OFFSET for detecting kernel null
 135  * ptr derefs */
 136 #define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 137
 138 /* These macros don't work for 64-bit C code -- don't allow in C at all */
 139 #ifdef __ASSEMBLY__
 140 #   define PA(x)        ((x)-__PAGE_OFFSET)
 141 #   define VA(x)        ((x)+__PAGE_OFFSET)
 142 #endif
 143 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 144 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 145
 146 #ifndef CONFIG_DISCONTIGMEM
 147 #define pfn_to_page(pfn)        (mem_map + (pfn))
 148 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 149 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 150 #endif /* CONFIG_DISCONTIGMEM */
 151
 152 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 153
 154 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 155 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 156
 157 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 158                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 159
 160 #endif /* __KERNEL__ */
 161
 162 #endif /* _PARISC_PAGE_H */