1 /*
2 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
3 * Copyright (C) 2004 Microtronix Datacom Ltd.
4 *
5 * MMU support based on asm/page.h from mips which is:
6 *
7 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file "COPYING" in the main directory of this archive
12 * for more details.
13 */
14
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 * PAGE_SHIFT determines the page size
23 */
24 #define PAGE_SHIFT CONFIG_PAGE_SHIFT
25 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
26 #define PAGE_MASK (~(PAGE_SIZE - 1))
27
28 /*
29 * PAGE_OFFSET -- the first address of the first page of memory.
30 */
31 #define PAGE_OFFSET \
32 (CONFIG_NIOS2_MEM_BASE + CONFIG_NIOS2_KERNEL_REGION_BASE)
33
34 #ifndef __ASSEMBLY__
35
36 /*
37 * This gives the physical RAM offset.
38 */
39 #define PHYS_OFFSET CONFIG_NIOS2_MEM_BASE
40
41 /*
42 * It's normally defined only for FLATMEM config but it's
43 * used in our early mem init code for all memory models.
44 * So always define it.
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
51 struct page;
52
53 extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
54 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
55 struct page *to);
56
57 /*
58 * These are used to make use of C type-checking.
59 */
60 typedef struct page *pgtable_t;
61 typedef struct { unsigned long pte; } pte_t;
62 typedef struct { unsigned long pgd; } pgd_t;
63 typedef 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
73 extern unsigned long memory_start;
74 extern unsigned long memory_end;
75 extern unsigned long memory_size;
76
77 extern 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
89 # define virt_to_page(vaddr) pfn_to_page(PFN_DOWN(virt_to_phys(vaddr)))
90 # define virt_addr_valid(vaddr) pfn_valid(PFN_DOWN(virt_to_phys(vaddr)))
91
92 # define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
93
94 #include <asm-generic/memory_model.h>
95
96 #include <asm-generic/getorder.h>
97
98 #endif /* !__ASSEMBLY__ */
99
100 #endif /* _ASM_NIOS2_PAGE_H */
101
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.