1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * OpenRISC Linux
4 *
5 * Linux architectural port borrowing liberally from similar works of
6 * others.  All original copyrights apply as per the original source
7 * declaration.
8 *
9 * OpenRISC implementation:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 * et al.
13 */
14
15#ifndef __ASM_OPENRISC_PAGE_H
16#define __ASM_OPENRISC_PAGE_H
17
18
19/* PAGE_SHIFT determines the page size */
20
21#define PAGE_SHIFT      CONFIG_PAGE_SHIFT
22#ifdef __ASSEMBLY__
23#define PAGE_SIZE       (1 << PAGE_SHIFT)
24#else
25#define PAGE_SIZE       (1UL << PAGE_SHIFT)
26#endif
27#define PAGE_MASK       (~(PAGE_SIZE-1))
28
29#define PAGE_OFFSET	0xc0000000
30#define KERNELBASE	PAGE_OFFSET
31
32/* This is not necessarily the right place for this, but it's needed by
33 * drivers/of/fdt.c
34 */
35#include <asm/setup.h>
36
37#ifndef __ASSEMBLY__
38
39#define clear_page(page)	memset((page), 0, PAGE_SIZE)
40#define copy_page(to, from)	memcpy((to), (from), PAGE_SIZE)
41
42#define clear_user_page(page, vaddr, pg)        clear_page(page)
43#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
44
45/*
46 * These are used to make use of C type-checking..
47 */
48typedef struct {
49	unsigned long pte;
50} pte_t;
51typedef struct {
52	unsigned long pgd;
53} pgd_t;
54typedef struct {
55	unsigned long pgprot;
56} pgprot_t;
57typedef struct page *pgtable_t;
58
59#define pte_val(x)	((x).pte)
60#define pgd_val(x)	((x).pgd)
61#define pgprot_val(x)	((x).pgprot)
62
63#define __pte(x)	((pte_t) { (x) })
64#define __pgd(x)	((pgd_t) { (x) })
65#define __pgprot(x)	((pgprot_t) { (x) })
66
67#endif /* !__ASSEMBLY__ */
68
69
70#ifndef __ASSEMBLY__
71
72#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
73#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
74
75static inline unsigned long virt_to_pfn(const void *kaddr)
76{
77	return __pa(kaddr) >> PAGE_SHIFT;
78}
79
80#define virt_to_page(addr) \
81	(mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
82
83#define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
84
85#define virt_addr_valid(kaddr)	(pfn_valid(virt_to_pfn(kaddr)))
86
87#endif /* __ASSEMBLY__ */
88
89#include <asm-generic/memory_model.h>
90#include <asm-generic/getorder.h>
91
92#endif /* __ASM_OPENRISC_PAGE_H */
93