arch/m32r/include/asm/page.h

   1 #ifndef _ASM_M32R_PAGE_H
   2 #define _ASM_M32R_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 #ifndef __ASSEMBLY__
  10
  11 extern void clear_page(void *to);
  12 extern void copy_page(void *to, void *from);
  13
  14 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  15 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  16
  17 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  18         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  19 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  20
  21 /*
  22  * These are used to make use of C type-checking..
  23  */
  24 typedef struct { unsigned long pte; } pte_t;
  25 typedef struct { unsigned long pmd; } pmd_t;
  26 typedef struct { unsigned long pgd; } pgd_t;
  27 #define pte_val(x)      ((x).pte)
  28 #define PTE_MASK        PAGE_MASK
  29
  30 typedef struct { unsigned long pgprot; } pgprot_t;
  31 typedef struct page *pgtable_t;
  32
  33 #define pmd_val(x)      ((x).pmd)
  34 #define pgd_val(x)      ((x).pgd)
  35 #define pgprot_val(x)   ((x).pgprot)
  36
  37 #define __pte(x) ((pte_t) { (x) } )
  38 #define __pmd(x) ((pmd_t) { (x) } )
  39 #define __pgd(x) ((pgd_t) { (x) } )
  40 #define __pgprot(x)     ((pgprot_t) { (x) } )
  41
  42 #endif /* !__ASSEMBLY__ */
  43
  44 /*
  45  * This handles the memory map.. We could make this a config
  46  * option, but too many people screw it up, and too few need
  47  * it.
  48  *
  49  * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  50  * a virtual address space of one gigabyte, which limits the
  51  * amount of physical memory you can use to about 950MB.
  52  *
  53  * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  54  * and CONFIG_HIGHMEM64G options in the kernel configuration.
  55  */
  56
  57 #define __MEMORY_START  CONFIG_MEMORY_START
  58 #define __MEMORY_SIZE   CONFIG_MEMORY_SIZE
  59
  60 #ifdef CONFIG_MMU
  61 #define __PAGE_OFFSET  (0x80000000)
  62 #else
  63 #define __PAGE_OFFSET  (0x00000000)
  64 #endif
  65
  66 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  67 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
  68 #define __va(x)                 ((void *)((unsigned long)(x) + PAGE_OFFSET))
  69
  70 #ifndef CONFIG_DISCONTIGMEM
  71 #define PFN_BASE                (CONFIG_MEMORY_START >> PAGE_SHIFT)
  72 #define ARCH_PFN_OFFSET         PFN_BASE
  73 #define pfn_valid(pfn)          (((pfn) - PFN_BASE) < max_mapnr)
  74 #endif  /* !CONFIG_DISCONTIGMEM */
  75
  76 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  77 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  78
  79 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  80                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC )
  81
  82 #define devmem_is_allowed(x) 1
  83
  84 #include <asm-generic/memory_model.h>
  85 #include <asm-generic/getorder.h>
  86
  87 #endif /* _ASM_M32R_PAGE_H */