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 <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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 */
55typedef struct {
56	unsigned long pte;
57} pte_t;
58typedef struct {
59	unsigned long pgd;
60} pgd_t;
61typedef struct {
62	unsigned long pgprot;
63} pgprot_t;
64typedef 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
103#include <asm-generic/memory_model.h>
104#include <asm-generic/getorder.h>
105
106#endif /* __ASM_OPENRISC_PAGE_H */
107