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
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 * These are used to make use of C type-checking.
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
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