arch/m32r/include/asm/page.h

   1 #ifndef _ASM_M32R_PAGE_H
   2 #define _ASM_M32R_PAGE_H
   3
   4 #include <linux/const.h>
   5
   6 /* PAGE_SHIFT determines the page size */
   7 #define PAGE_SHIFT      12
   8 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
   9 #define PAGE_MASK       (~(PAGE_SIZE-1))
  10
  11 #ifndef __ASSEMBLY__
  12
  13 extern void clear_page(void *to);
  14 extern void copy_page(void *to, void *from);
  15
  16 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  17 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  18
  19 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  20         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, 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 typedef struct page *pgtable_t;
  34
  35 #define pmd_val(x)      ((x).pmd)
  36 #define pgd_val(x)      ((x).pgd)
  37 #define pgprot_val(x)   ((x).pgprot)
  38
  39 #define __pte(x) ((pte_t) { (x) } )
  40 #define __pmd(x) ((pmd_t) { (x) } )
  41 #define __pgd(x) ((pgd_t) { (x) } )
  42 #define __pgprot(x)     ((pgprot_t) { (x) } )
  43
  44 #endif /* !__ASSEMBLY__ */
  45
  46 /*
  47  * This handles the memory map.. We could make this a config
  48  * option, but too many people screw it up, and too few need
  49  * it.
  50  *
  51  * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  52  * a virtual address space of one gigabyte, which limits the
  53  * amount of physical memory you can use to about 950MB.
  54  *
  55  * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  56  * and CONFIG_HIGHMEM64G options in the kernel configuration.
  57  */
  58
  59 #define __MEMORY_START  CONFIG_MEMORY_START
  60 #define __MEMORY_SIZE   CONFIG_MEMORY_SIZE
  61
  62 #ifdef CONFIG_MMU
  63 #define __PAGE_OFFSET  (0x80000000)
  64 #else
  65 #define __PAGE_OFFSET  (0x00000000)
  66 #endif
  67
  68 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  69 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
  70 #define __va(x)                 ((void *)((unsigned long)(x) + PAGE_OFFSET))
  71
  72 #ifndef CONFIG_DISCONTIGMEM
  73 #define PFN_BASE                (CONFIG_MEMORY_START >> PAGE_SHIFT)
  74 #define ARCH_PFN_OFFSET         PFN_BASE
  75 #define pfn_valid(pfn)          (((pfn) - PFN_BASE) < max_mapnr)
  76 #endif  /* !CONFIG_DISCONTIGMEM */
  77
  78 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  79 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  80
  81 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  82                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC )
  83
  84 #define devmem_is_allowed(x) 1
  85
  86 #include <asm-generic/memory_model.h>
  87 #include <asm-generic/getorder.h>
  88
  89 #endif /* _ASM_M32R_PAGE_H */