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Linux/arch/m32r/include/asm/page.h

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  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 */
 90 

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