arch/metag/include/asm/page.h

   1 #ifndef _METAG_PAGE_H
   2 #define _METAG_PAGE_H
   3
   4 #include <linux/const.h>
   5
   6 #include <asm/metag_mem.h>
   7
   8 /* PAGE_SHIFT determines the page size */
   9 #if defined(CONFIG_PAGE_SIZE_4K)
  10 #define PAGE_SHIFT      12
  11 #elif defined(CONFIG_PAGE_SIZE_8K)
  12 #define PAGE_SHIFT      13
  13 #elif defined(CONFIG_PAGE_SIZE_16K)
  14 #define PAGE_SHIFT      14
  15 #endif
  16
  17 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  18 #define PAGE_MASK       (~(PAGE_SIZE-1))
  19
  20 #if defined(CONFIG_HUGETLB_PAGE_SIZE_8K)
  21 # define HPAGE_SHIFT    13
  22 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_16K)
  23 # define HPAGE_SHIFT    14
  24 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_32K)
  25 # define HPAGE_SHIFT    15
  26 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  27 # define HPAGE_SHIFT    16
  28 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_128K)
  29 # define HPAGE_SHIFT    17
  30 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
  31 # define HPAGE_SHIFT    18
  32 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
  33 # define HPAGE_SHIFT    19
  34 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1M)
  35 # define HPAGE_SHIFT    20
  36 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_2M)
  37 # define HPAGE_SHIFT    21
  38 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4M)
  39 # define HPAGE_SHIFT    22
  40 #endif
  41
  42 #ifdef CONFIG_HUGETLB_PAGE
  43 # define HPAGE_SIZE             (1UL << HPAGE_SHIFT)
  44 # define HPAGE_MASK             (~(HPAGE_SIZE-1))
  45 # define HUGETLB_PAGE_ORDER     (HPAGE_SHIFT-PAGE_SHIFT)
  46 /*
  47  * We define our own hugetlb_get_unmapped_area so we don't corrupt 2nd level
  48  * page tables with normal pages in them.
  49  */
  50 # define HUGEPT_SHIFT           (22)
  51 # define HUGEPT_ALIGN           (1 << HUGEPT_SHIFT)
  52 # define HUGEPT_MASK            (HUGEPT_ALIGN - 1)
  53 # define ALIGN_HUGEPT(x)        ALIGN(x, HUGEPT_ALIGN)
  54 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  55 #endif
  56
  57 #ifndef __ASSEMBLY__
  58
  59 /* On the Meta, we would like to know if the address (heap) we have is
  60  * in local or global space.
  61  */
  62 #define is_global_space(addr)   ((addr) > 0x7fffffff)
  63 #define is_local_space(addr)    (!is_global_space(addr))
  64
  65 extern void clear_page(void *to);
  66 extern void copy_page(void *to, void *from);
  67
  68 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  69 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  70
  71 /*
  72  * These are used to make use of C type-checking..
  73  */
  74 typedef struct { unsigned long pte; } pte_t;
  75 typedef struct { unsigned long pgd; } pgd_t;
  76 typedef struct { unsigned long pgprot; } pgprot_t;
  77 typedef struct page *pgtable_t;
  78
  79 #define pte_val(x)      ((x).pte)
  80 #define pgd_val(x)      ((x).pgd)
  81 #define pgprot_val(x)   ((x).pgprot)
  82
  83 #define __pte(x)        ((pte_t) { (x) })
  84 #define __pgd(x)        ((pgd_t) { (x) })
  85 #define __pgprot(x)     ((pgprot_t) { (x) })
  86
  87 /* The kernel must now ALWAYS live at either 0xC0000000 or 0x40000000 - that
  88  * being either global or local space.
  89  */
  90 #define PAGE_OFFSET             (CONFIG_PAGE_OFFSET)
  91
  92 #if PAGE_OFFSET >= LINGLOBAL_BASE
  93 #define META_MEMORY_BASE  LINGLOBAL_BASE
  94 #define META_MEMORY_LIMIT LINGLOBAL_LIMIT
  95 #else
  96 #define META_MEMORY_BASE  LINLOCAL_BASE
  97 #define META_MEMORY_LIMIT LINLOCAL_LIMIT
  98 #endif
  99
 100 /* Offset between physical and virtual mapping of kernel memory. */
 101 extern unsigned int meta_memoffset;
 102
 103 #define __pa(x) ((unsigned long)(((unsigned long)(x)) - meta_memoffset))
 104 #define __va(x) ((void *)((unsigned long)(((unsigned long)(x)) + meta_memoffset)))
 105
 106 extern unsigned long pfn_base;
 107 #define ARCH_PFN_OFFSET         (pfn_base)
 108 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 109 #define page_to_virt(page)      __va(page_to_pfn(page) << PAGE_SHIFT)
 110 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 111 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 112 #ifdef CONFIG_FLATMEM
 113 extern unsigned long max_pfn;
 114 extern unsigned long min_low_pfn;
 115 #define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_pfn)
 116 #endif
 117
 118 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 119
 120 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 121                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 122
 123 #include <asm-generic/memory_model.h>
 124 #include <asm-generic/getorder.h>
 125
 126 #endif /* __ASSMEBLY__ */
 127
 128 #endif /* _METAG_PAGE_H */