1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * page.h: Various defines and such for MMU operations on the Sparc for
4 * the Linux kernel.
5 *
6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
7 */
8
9 #ifndef _SPARC_PAGE_H
10 #define _SPARC_PAGE_H
11
12 #include <linux/const.h>
13
14 #define PAGE_SHIFT CONFIG_PAGE_SHIFT
15 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
16 #define PAGE_MASK (~(PAGE_SIZE-1))
17
18 #ifndef __ASSEMBLY__
19
20 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
21 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
22 #define clear_user_page(addr, vaddr, page) \
23 do { clear_page(addr); \
24 sparc_flush_page_to_ram(page); \
25 } while (0)
26 #define copy_user_page(to, from, vaddr, page) \
27 do { copy_page(to, from); \
28 sparc_flush_page_to_ram(page); \
29 } while (0)
30
31 /* The following structure is used to hold the physical
32 * memory configuration of the machine. This is filled in
33 * prom_meminit() and is later used by mem_init() to set up
34 * mem_map[]. We statically allocate SPARC_PHYS_BANKS+1 of
35 * these structs, this is arbitrary. The entry after the
36 * last valid one has num_bytes==0.
37 */
38 struct sparc_phys_banks {
39 unsigned long base_addr;
40 unsigned long num_bytes;
41 };
42
43 #define SPARC_PHYS_BANKS 32
44
45 extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
46
47 /* passing structs on the Sparc slow us down tremendously... */
48
49 /* #define STRICT_MM_TYPECHECKS */
50
51 #ifdef STRICT_MM_TYPECHECKS
52 /*
53 * These are used to make use of C type-checking..
54 */
55 typedef struct { unsigned long pte; } pte_t;
56 typedef struct { unsigned long iopte; } iopte_t;
57 typedef struct { unsigned long pmd; } pmd_t;
58 typedef struct { unsigned long pgd; } pgd_t;
59 typedef struct { unsigned long ctxd; } ctxd_t;
60 typedef struct { unsigned long pgprot; } pgprot_t;
61 typedef struct { unsigned long iopgprot; } iopgprot_t;
62
63 #define pte_val(x) ((x).pte)
64 #define iopte_val(x) ((x).iopte)
65 #define pmd_val(x) ((x).pmd)
66 #define pgd_val(x) ((x).pgd)
67 #define ctxd_val(x) ((x).ctxd)
68 #define pgprot_val(x) ((x).pgprot)
69 #define iopgprot_val(x) ((x).iopgprot)
70
71 #define __pte(x) ((pte_t) { (x) } )
72 #define __pmd(x) ((pmd_t) { { (x) }, })
73 #define __iopte(x) ((iopte_t) { (x) } )
74 #define __pgd(x) ((pgd_t) { (x) } )
75 #define __ctxd(x) ((ctxd_t) { (x) } )
76 #define __pgprot(x) ((pgprot_t) { (x) } )
77 #define __iopgprot(x) ((iopgprot_t) { (x) } )
78
79 #else
80 /*
81 * .. while these make it easier on the compiler
82 */
83 typedef unsigned long pte_t;
84 typedef unsigned long iopte_t;
85 typedef unsigned long pmd_t;
86 typedef unsigned long pgd_t;
87 typedef unsigned long ctxd_t;
88 typedef unsigned long pgprot_t;
89 typedef unsigned long iopgprot_t;
90
91 #define pte_val(x) (x)
92 #define iopte_val(x) (x)
93 #define pmd_val(x) (x)
94 #define pgd_val(x) (x)
95 #define ctxd_val(x) (x)
96 #define pgprot_val(x) (x)
97 #define iopgprot_val(x) (x)
98
99 #define __pte(x) (x)
100 #define __pmd(x) (x)
101 #define __iopte(x) (x)
102 #define __pgd(x) (x)
103 #define __ctxd(x) (x)
104 #define __pgprot(x) (x)
105 #define __iopgprot(x) (x)
106
107 #endif
108
109 typedef pte_t *pgtable_t;
110
111 #define TASK_UNMAPPED_BASE 0x50000000
112
113 #else /* !(__ASSEMBLY__) */
114
115 #define __pgprot(x) (x)
116
117 #endif /* !(__ASSEMBLY__) */
118
119 #define PAGE_OFFSET 0xf0000000
120 #ifndef __ASSEMBLY__
121 extern unsigned long phys_base;
122 extern unsigned long pfn_base;
123 #endif
124 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + phys_base)
125 #define __va(x) ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
126
127 #define virt_to_phys __pa
128 #define phys_to_virt __va
129
130 #define ARCH_PFN_OFFSET (pfn_base)
131 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
132
133 #define virt_addr_valid(kaddr) ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
134
135 #include <asm-generic/memory_model.h>
136 #include <asm-generic/getorder.h>
137
138 #endif /* _SPARC_PAGE_H */
139
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