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      13
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 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
76 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
77 
78 #define virt_to_page(addr) \
79 	(mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
80 
81 #define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
82 
83 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
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