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page.h
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1 /*
2  * OpenRISC Linux
3  *
4  * Linux architectural port borrowing liberally from similar works of
5  * others. All original copyrights apply as per the original source
6  * declaration.
7  *
8  * OpenRISC implementation:
9  * Copyright (C) 2003 Matjaz Breskvar <[email protected]>
10  * Copyright (C) 2010-2011 Jonas Bonn <[email protected]>
11  * et al.
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License as published by
15  * the Free Software Foundation; either version 2 of the License, or
16  * (at your option) any later version.
17  */
18 
19 #ifndef __ASM_OPENRISC_PAGE_H
20 #define __ASM_OPENRISC_PAGE_H
21 
22 
23 /* PAGE_SHIFT determines the page size */
24 
25 #define PAGE_SHIFT 13
26 #ifdef __ASSEMBLY__
27 #define PAGE_SIZE (1 << PAGE_SHIFT)
28 #else
29 #define PAGE_SIZE (1UL << PAGE_SHIFT)
30 #endif
31 #define PAGE_MASK (~(PAGE_SIZE-1))
32 
33 #define PAGE_OFFSET 0xc0000000
34 #define KERNELBASE PAGE_OFFSET
35 
36 /* This is not necessarily the right place for this, but it's needed by
37  * drivers/of/fdt.c
38  */
39 #include <asm/setup.h>
40 
41 #ifndef __ASSEMBLY__
42 
43 #define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
44 #define free_user_page(page, addr) free_page(addr)
45 
46 #define clear_page(page) memset((page), 0, PAGE_SIZE)
47 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
48 
49 #define clear_user_page(page, vaddr, pg) clear_page(page)
50 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
51 
52 /*
53  * These are used to make use of C type-checking..
54  */
55 typedef struct {
56  unsigned long pte;
57 } pte_t;
58 typedef struct {
59  unsigned long pgd;
60 } pgd_t;
61 typedef struct {
62  unsigned long pgprot;
63 } pgprot_t;
64 typedef struct page *pgtable_t;
65 
66 #define pte_val(x) ((x).pte)
67 #define pgd_val(x) ((x).pgd)
68 #define pgprot_val(x) ((x).pgprot)
69 
70 #define __pte(x) ((pte_t) { (x) })
71 #define __pgd(x) ((pgd_t) { (x) })
72 #define __pgprot(x) ((pgprot_t) { (x) })
73 
74 #endif /* !__ASSEMBLY__ */
75 
76 
77 #ifndef __ASSEMBLY__
78 
79 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
80 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
81 
82 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
83 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
84 
85 #define virt_to_page(addr) \
86  (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
87 #define page_to_virt(page) \
88  ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
89 
90 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
91 
92 #define pfn_valid(pfn) ((pfn) < max_mapnr)
93 
94 #define virt_addr_valid(kaddr) (pfn_valid(virt_to_pfn(kaddr)))
95 
96 #endif /* __ASSEMBLY__ */
97 
98 
99 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
100  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
101 
102 
104 #include <asm-generic/getorder.h>
105 
106 #endif /* __ASM_OPENRISC_PAGE_H */