include/asm-parisc/page.h

   1 #ifndef _PARISC_PAGE_H
   2 #define _PARISC_PAGE_H
   3
   4 #if !defined(__KERNEL__)
   5 /* this is for userspace applications (4k page size) */
   6 # define PAGE_SHIFT     12      /* 4k */
   7 # define PAGE_SIZE      (1UL << PAGE_SHIFT)
   8 # define PAGE_MASK      (~(PAGE_SIZE-1))
   9 #endif
  10
  11
  12 #ifdef __KERNEL__
  13 #include <linux/config.h>
  14
  15 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
  16 # define PAGE_SHIFT     12      /* 4k */
  17 #elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
  18 # define PAGE_SHIFT     14      /* 16k */
  19 #elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
  20 # define PAGE_SHIFT     16      /* 64k */
  21 #else
  22 # error "unknown default kernel page size"
  23 #endif
  24 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  25 #define PAGE_MASK       (~(PAGE_SIZE-1))
  26
  27
  28 #ifndef __ASSEMBLY__
  29
  30 #include <asm/types.h>
  31 #include <asm/cache.h>
  32
  33 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  34 #define copy_page(to,from)      copy_user_page_asm((void *)(to), (void *)(from))
  35
  36 struct page;
  37
  38 extern void purge_kernel_dcache_page(unsigned long);
  39 extern void copy_user_page_asm(void *to, void *from);
  40 extern void clear_user_page_asm(void *page, unsigned long vaddr);
  41
  42 static inline void
  43 copy_user_page(void *vto, void *vfrom, unsigned long vaddr, struct page *pg)
  44 {
  45         copy_user_page_asm(vto, vfrom);
  46         flush_kernel_dcache_page_asm(vto);
  47         /* XXX: ppc flushes icache too, should we? */
  48 }
  49
  50 static inline void
  51 clear_user_page(void *page, unsigned long vaddr, struct page *pg)
  52 {
  53         purge_kernel_dcache_page((unsigned long)page);
  54         clear_user_page_asm(page, vaddr);
  55 }
  56
  57 /*
  58  * These are used to make use of C type-checking..
  59  */
  60 #define STRICT_MM_TYPECHECKS
  61 #ifdef STRICT_MM_TYPECHECKS
  62 typedef struct { unsigned long pte;
  63 #if !defined(CONFIG_64BIT)
  64                  unsigned long future_flags;
  65  /* XXX: it's possible to remove future_flags and change BITS_PER_PTE_ENTRY
  66          to 2, but then strangely the identical 32bit kernel boots on a
  67          c3000(pa20), but not any longer on a 715(pa11).
  68          Still investigating... HelgeD.
  69   */
  70 #endif
  71 } pte_t; /* either 32 or 64bit */
  72
  73 /* NOTE: even on 64 bits, these entries are __u32 because we allocate
  74  * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  75 typedef struct { __u32 pmd; } pmd_t;
  76 typedef struct { __u32 pgd; } pgd_t;
  77 typedef struct { unsigned long pgprot; } pgprot_t;
  78
  79 #define pte_val(x)      ((x).pte)
  80 /* These do not work lvalues, so make sure we don't use them as such. */
  81 #define pmd_val(x)      ((x).pmd + 0)
  82 #define pgd_val(x)      ((x).pgd + 0)
  83 #define pgprot_val(x)   ((x).pgprot)
  84
  85 #define __pte(x)        ((pte_t) { (x) } )
  86 #define __pmd(x)        ((pmd_t) { (x) } )
  87 #define __pgd(x)        ((pgd_t) { (x) } )
  88 #define __pgprot(x)     ((pgprot_t) { (x) } )
  89
  90 #define __pmd_val_set(x,n) (x).pmd = (n)
  91 #define __pgd_val_set(x,n) (x).pgd = (n)
  92
  93 #else
  94 /*
  95  * .. while these make it easier on the compiler
  96  */
  97 typedef unsigned long pte_t;
  98 typedef         __u32 pmd_t;
  99 typedef         __u32 pgd_t;
 100 typedef unsigned long pgprot_t;
 101
 102 #define pte_val(x)      (x)
 103 #define pmd_val(x)      (x)
 104 #define pgd_val(x)      (x)
 105 #define pgprot_val(x)   (x)
 106
 107 #define __pte(x)        (x)
 108 #define __pmd(x)        (x)
 109 #define __pgd(x)        (x)
 110 #define __pgprot(x)     (x)
 111
 112 #define __pmd_val_set(x,n) (x) = (n)
 113 #define __pgd_val_set(x,n) (x) = (n)
 114
 115 #endif /* STRICT_MM_TYPECHECKS */
 116
 117
 118 typedef struct __physmem_range {
 119         unsigned long start_pfn;
 120         unsigned long pages;       /* PAGE_SIZE pages */
 121 } physmem_range_t;
 122
 123 extern physmem_range_t pmem_ranges[];
 124 extern int npmem_ranges;
 125
 126 #endif /* !__ASSEMBLY__ */
 127
 128 /* WARNING: The definitions below must match exactly to sizeof(pte_t)
 129  * etc
 130  */
 131 #ifdef __LP64__
 132 #define BITS_PER_PTE_ENTRY      3
 133 #define BITS_PER_PMD_ENTRY      2
 134 #define BITS_PER_PGD_ENTRY      2
 135 #else
 136 #define BITS_PER_PTE_ENTRY      3
 137 #define BITS_PER_PMD_ENTRY      2
 138 #define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 139 #endif
 140 #define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 141 #define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 142 #define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 143
 144 /* to align the pointer to the (next) page boundary */
 145 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 146
 147
 148 #define LINUX_GATEWAY_SPACE     0
 149
 150 /* This governs the relationship between virtual and physical addresses.
 151  * If you alter it, make sure to take care of our various fixed mapping
 152  * segments in fixmap.h */
 153 #define __PAGE_OFFSET           (0x10000000)
 154
 155 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 156
 157 /* The size of the gateway page (we leave lots of room for expansion) */
 158 #define GATEWAY_PAGE_SIZE       0x4000
 159
 160 /* The start of the actual kernel binary---used in vmlinux.lds.S
 161  * Leave some space after __PAGE_OFFSET for detecting kernel null
 162  * ptr derefs */
 163 #define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 164
 165 /* These macros don't work for 64-bit C code -- don't allow in C at all */
 166 #ifdef __ASSEMBLY__
 167 #   define PA(x)        ((x)-__PAGE_OFFSET)
 168 #   define VA(x)        ((x)+__PAGE_OFFSET)
 169 #endif
 170 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 171 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 172
 173 #ifndef CONFIG_DISCONTIGMEM
 174 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 175 #endif /* CONFIG_DISCONTIGMEM */
 176
 177 #ifdef CONFIG_HUGETLB_PAGE
 178 #define HPAGE_SHIFT             22      /* 4MB (is this fixed?) */
 179 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 180 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 181 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 182 #endif
 183
 184 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 185
 186 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 187 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 188
 189 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 190                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 191
 192 #endif /* __KERNEL__ */
 193
 194 #include <asm-generic/memory_model.h>
 195 #include <asm-generic/page.h>
 196
 197 #endif /* _PARISC_PAGE_H */