1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _M68K_PAGE_MM_H
3 #define _M68K_PAGE_MM_H
4
5 #ifndef __ASSEMBLY__
6
7 #include <linux/compiler.h>
8 #include <asm/module.h>
9
10 /*
11 * We don't need to check for alignment etc.
12 */
13 #ifdef CPU_M68040_OR_M68060_ONLY
14 static inline void copy_page(void *to, void *from)
15 {
16 unsigned long tmp;
17
18 __asm__ __volatile__("1:\t"
19 ".chip 68040\n\t"
20 "move16 %1@+,%0@+\n\t"
21 "move16 %1@+,%0@+\n\t"
22 ".chip 68k\n\t"
23 "dbra %2,1b\n\t"
24 : "=a" (to), "=a" (from), "=d" (tmp)
25 : "" (to), "1" (from), "2" (PAGE_SIZE / 32 - 1));
26 }
27
28 static inline void clear_page(void *page)
29 {
30 unsigned long tmp;
31 unsigned long *sp = page;
32
33 *sp++ = 0;
34 *sp++ = 0;
35 *sp++ = 0;
36 *sp++ = 0;
37
38 __asm__ __volatile__("1:\t"
39 ".chip 68040\n\t"
40 "move16 %2@+,%0@+\n\t"
41 ".chip 68k\n\t"
42 "subqw #8,%2\n\t"
43 "subqw #8,%2\n\t"
44 "dbra %1,1b\n\t"
45 : "=a" (sp), "=d" (tmp)
46 : "a" (page), "" (sp),
47 "1" ((PAGE_SIZE - 16) / 16 - 1));
48 }
49
50 #else
51 #define clear_page(page) memset((page), 0, PAGE_SIZE)
52 #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE)
53 #endif
54
55 #define clear_user_page(addr, vaddr, page) \
56 do { clear_page(addr); \
57 flush_dcache_page(page); \
58 } while (0)
59 #define copy_user_page(to, from, vaddr, page) \
60 do { copy_page(to, from); \
61 flush_dcache_page(page); \
62 } while (0)
63
64 extern unsigned long m68k_memoffset;
65
66 #ifndef CONFIG_SUN3
67
68 #define WANT_PAGE_VIRTUAL
69
70 static inline unsigned long ___pa(void *vaddr)
71 {
72 unsigned long paddr;
73 asm (
74 "1: addl #0,%0\n"
75 m68k_fixup(%c2, 1b+2)
76 : "=r" (paddr)
77 : "" (vaddr), "i" (m68k_fixup_memoffset));
78 return paddr;
79 }
80 #define __pa(vaddr) ___pa((void *)(long)(vaddr))
81 static inline void *__va(unsigned long paddr)
82 {
83 void *vaddr;
84 asm (
85 "1: subl #0,%0\n"
86 m68k_fixup(%c2, 1b+2)
87 : "=r" (vaddr)
88 : "" (paddr), "i" (m68k_fixup_memoffset));
89 return vaddr;
90 }
91
92 #else /* !CONFIG_SUN3 */
93 /* This #define is a horrible hack to suppress lots of warnings. --m */
94 #define __pa(x) ___pa((unsigned long)(x))
95 static inline unsigned long ___pa(unsigned long x)
96 {
97 if (x == 0)
98 return 0;
99 if (x >= PAGE_OFFSET)
100 return (x - PAGE_OFFSET);
101 else
102 return (x + 0x2000000);
103 }
104
105 static inline void *__va(unsigned long x)
106 {
107 if (x == 0)
108 return (void *)0;
109
110 if (x < 0x2000000)
111 return (void *)(x + PAGE_OFFSET);
112 else
113 return (void *)(x - 0x2000000);
114 }
115 #endif /* CONFIG_SUN3 */
116
117 /*
118 * NOTE: virtual isn't really correct, actually it should be the offset into the
119 * memory node, but we have no highmem, so that works for now.
120 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
121 * of the shifts unnecessary.
122 */
123 static inline unsigned long virt_to_pfn(const void *kaddr)
124 {
125 return __pa(kaddr) >> PAGE_SHIFT;
126 }
127
128 static inline void *pfn_to_virt(unsigned long pfn)
129 {
130 return __va(pfn << PAGE_SHIFT);
131 }
132
133 extern int m68k_virt_to_node_shift;
134
135 #define virt_to_page(addr) ({ \
136 pfn_to_page(virt_to_pfn(addr)); \
137 })
138 #define page_to_virt(page) ({ \
139 pfn_to_virt(page_to_pfn(page)); \
140 })
141
142 #define ARCH_PFN_OFFSET (m68k_memory[0].addr >> PAGE_SHIFT)
143
144 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
145 #define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn))
146
147 #endif /* __ASSEMBLY__ */
148
149 #endif /* _M68K_PAGE_MM_H */
150
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