include/asm-m32r/page.h

   1 #ifndef _ASM_M32R_PAGE_H
   2 #define _ASM_M32R_PAGE_H
   3
   4 #include <linux/config.h>
   5
   6 /* PAGE_SHIFT determines the page size */
   7 #define PAGE_SHIFT      12
   8 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
   9 #define PAGE_MASK       (~(PAGE_SIZE-1))
  10
  11 #ifdef __KERNEL__
  12 #ifndef __ASSEMBLY__
  13
  14 extern void clear_page(void *to);
  15 extern void copy_page(void *to, void *from);
  16
  17 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  18 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  19
  20 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
  21 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  22
  23 /*
  24  * These are used to make use of C type-checking..
  25  */
  26 typedef struct { unsigned long pte; } pte_t;
  27 typedef struct { unsigned long pmd; } pmd_t;
  28 typedef struct { unsigned long pgd; } pgd_t;
  29 #define pte_val(x)      ((x).pte)
  30 #define PTE_MASK        PAGE_MASK
  31
  32 typedef struct { unsigned long pgprot; } pgprot_t;
  33
  34 #define pmd_val(x)      ((x).pmd)
  35 #define pgd_val(x)      ((x).pgd)
  36 #define pgprot_val(x)   ((x).pgprot)
  37
  38 #define __pte(x) ((pte_t) { (x) } )
  39 #define __pmd(x) ((pmd_t) { (x) } )
  40 #define __pgd(x) ((pgd_t) { (x) } )
  41 #define __pgprot(x)     ((pgprot_t) { (x) } )
  42
  43 #endif /* !__ASSEMBLY__ */
  44
  45 /* to align the pointer to the (next) page boundary */
  46 #define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
  47
  48 /*
  49  * This handles the memory map.. We could make this a config
  50  * option, but too many people screw it up, and too few need
  51  * it.
  52  *
  53  * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  54  * a virtual address space of one gigabyte, which limits the
  55  * amount of physical memory you can use to about 950MB.
  56  *
  57  * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  58  * and CONFIG_HIGHMEM64G options in the kernel configuration.
  59  */
  60
  61
  62 /* This handles the memory map.. */
  63
  64 #ifndef __ASSEMBLY__
  65
  66 /* Pure 2^n version of get_order */
  67 static __inline__ int get_order(unsigned long size)
  68 {
  69         int order;
  70
  71         size = (size - 1) >> (PAGE_SHIFT - 1);
  72         order = -1;
  73         do {
  74                 size >>= 1;
  75                 order++;
  76         } while (size);
  77
  78         return order;
  79 }
  80
  81 #endif /* __ASSEMBLY__ */
  82
  83 #define __MEMORY_START  CONFIG_MEMORY_START
  84 #define __MEMORY_SIZE   CONFIG_MEMORY_SIZE
  85
  86 #ifdef CONFIG_MMU
  87 #define __PAGE_OFFSET  (0x80000000)
  88 #else
  89 #define __PAGE_OFFSET  (0x00000000)
  90 #endif
  91
  92 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  93 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
  94 #define __va(x)                 ((void *)((unsigned long)(x) + PAGE_OFFSET))
  95
  96 #ifndef CONFIG_DISCONTIGMEM
  97 #define PFN_BASE                (CONFIG_MEMORY_START >> PAGE_SHIFT)
  98 #define pfn_to_page(pfn)        (mem_map + ((pfn) - PFN_BASE))
  99 #define page_to_pfn(page)       \
 100         ((unsigned long)((page) - mem_map) + PFN_BASE)
 101 #define pfn_valid(pfn)          (((pfn) - PFN_BASE) < max_mapnr)
 102 #endif  /* !CONFIG_DISCONTIGMEM */
 103
 104 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 105 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 106
 107 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 108                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC )
 109
 110 #define devmem_is_allowed(x) 1
 111
 112 #endif /* __KERNEL__ */
 113
 114 #endif /* _ASM_M32R_PAGE_H */
 115