Linux Kernel  3.7.1
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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 
87 #include <asm-generic/getorder.h>
88 
89 #endif /* _ASM_M32R_PAGE_H */