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