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 */
48 typedef struct {
49 unsigned long pte;
50 } pte_t;
51 typedef struct {
52 unsigned long pgd;
53 } pgd_t;
54 typedef struct {
55 unsigned long pgprot;
56 } pgprot_t;
57 typedef 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
75 static 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
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