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15#ifndef _ASM_NIOS2_PAGE_H
16#define _ASM_NIOS2_PAGE_H
17
18#include <linux/pfn.h>
19#include <linux/const.h>
20
21
22
23
24#define PAGE_SHIFT 12
25#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
26#define PAGE_MASK (~(PAGE_SIZE - 1))
27
28
29
30
31#define PAGE_OFFSET \
32 (CONFIG_NIOS2_MEM_BASE + CONFIG_NIOS2_KERNEL_REGION_BASE)
33
34#ifndef __ASSEMBLY__
35
36
37
38
39#define PHYS_OFFSET CONFIG_NIOS2_MEM_BASE
40
41
42
43
44
45
46#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
47
48#define clear_page(page) memset((page), 0, PAGE_SIZE)
49#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
50
51struct page;
52
53extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
54extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
55 struct page *to);
56
57
58
59
60typedef struct page *pgtable_t;
61typedef struct { unsigned long pte; } pte_t;
62typedef struct { unsigned long pgd; } pgd_t;
63typedef struct { unsigned long pgprot; } pgprot_t;
64
65#define pte_val(x) ((x).pte)
66#define pgd_val(x) ((x).pgd)
67#define pgprot_val(x) ((x).pgprot)
68
69#define __pte(x) ((pte_t) { (x) })
70#define __pgd(x) ((pgd_t) { (x) })
71#define __pgprot(x) ((pgprot_t) { (x) })
72
73extern unsigned long memory_start;
74extern unsigned long memory_end;
75extern unsigned long memory_size;
76
77extern struct page *mem_map;
78
79# define __pa(x) \
80 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
81# define __va(x) \
82 ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
83
84#define page_to_virt(page) \
85 ((void *)(((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
86
87# define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
88
89static inline bool pfn_valid(unsigned long pfn)
90{
91
92 extern unsigned long max_mapnr;
93 unsigned long pfn_offset = ARCH_PFN_OFFSET;
94
95 return pfn >= pfn_offset && pfn < max_mapnr;
96}
97
98# define virt_to_page(vaddr) pfn_to_page(PFN_DOWN(virt_to_phys(vaddr)))
99# define virt_addr_valid(vaddr) pfn_valid(PFN_DOWN(virt_to_phys(vaddr)))
100
101# define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
102
103#include <asm-generic/memory_model.h>
104
105#include <asm-generic/getorder.h>
106
107#endif
108
109#endif
110