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
copy_page(void * to,void * from)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 : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
26 );
27 }
28
clear_page(void * page)29 static inline void clear_page(void *page)
30 {
31 unsigned long tmp;
32 unsigned long *sp = page;
33
34 *sp++ = 0;
35 *sp++ = 0;
36 *sp++ = 0;
37 *sp++ = 0;
38
39 __asm__ __volatile__("1:\t"
40 ".chip 68040\n\t"
41 "move16 %2@+,%0@+\n\t"
42 ".chip 68k\n\t"
43 "subqw #8,%2\n\t"
44 "subqw #8,%2\n\t"
45 "dbra %1,1b\n\t"
46 : "=a" (sp), "=d" (tmp)
47 : "a" (page), "0" (sp),
48 "1" ((PAGE_SIZE - 16) / 16 - 1));
49 }
50
51 #else
52 #define clear_page(page) memset((page), 0, PAGE_SIZE)
53 #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE)
54 #endif
55
56 #define clear_user_page(addr, vaddr, page) \
57 do { clear_page(addr); \
58 flush_dcache_page(page); \
59 } while (0)
60 #define copy_user_page(to, from, vaddr, page) \
61 do { copy_page(to, from); \
62 flush_dcache_page(page); \
63 } while (0)
64
65 extern unsigned long m68k_memoffset;
66
67 #ifndef CONFIG_SUN3
68
69 #define WANT_PAGE_VIRTUAL
70
___pa(void * vaddr)71 static inline unsigned long ___pa(void *vaddr)
72 {
73 unsigned long paddr;
74 asm (
75 "1: addl #0,%0\n"
76 m68k_fixup(%c2, 1b+2)
77 : "=r" (paddr)
78 : "0" (vaddr), "i" (m68k_fixup_memoffset));
79 return paddr;
80 }
81 #define __pa(vaddr) ___pa((void *)(long)(vaddr))
__va(unsigned long paddr)82 static inline void *__va(unsigned long paddr)
83 {
84 void *vaddr;
85 asm (
86 "1: subl #0,%0\n"
87 m68k_fixup(%c2, 1b+2)
88 : "=r" (vaddr)
89 : "0" (paddr), "i" (m68k_fixup_memoffset));
90 return vaddr;
91 }
92
93 #else /* !CONFIG_SUN3 */
94 /* This #define is a horrible hack to suppress lots of warnings. --m */
95 #define __pa(x) ___pa((unsigned long)(x))
___pa(unsigned long x)96 static inline unsigned long ___pa(unsigned long x)
97 {
98 if(x == 0)
99 return 0;
100 if(x >= PAGE_OFFSET)
101 return (x-PAGE_OFFSET);
102 else
103 return (x+0x2000000);
104 }
105
__va(unsigned long x)106 static inline void *__va(unsigned long x)
107 {
108 if(x == 0)
109 return (void *)0;
110
111 if(x < 0x2000000)
112 return (void *)(x+PAGE_OFFSET);
113 else
114 return (void *)(x-0x2000000);
115 }
116 #endif /* CONFIG_SUN3 */
117
118 /*
119 * NOTE: virtual isn't really correct, actually it should be the offset into the
120 * memory node, but we have no highmem, so that works for now.
121 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
122 * of the shifts unnecessary.
123 */
124 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
125 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
126
127 extern int m68k_virt_to_node_shift;
128
129 #ifndef CONFIG_DISCONTIGMEM
130 #define __virt_to_node(addr) (&pg_data_map[0])
131 #else
132 extern struct pglist_data *pg_data_table[];
133
__virt_to_node_shift(void)134 static inline __attribute_const__ int __virt_to_node_shift(void)
135 {
136 int shift;
137
138 asm (
139 "1: moveq #0,%0\n"
140 m68k_fixup(%c1, 1b)
141 : "=d" (shift)
142 : "i" (m68k_fixup_vnode_shift));
143 return shift;
144 }
145
146 #define __virt_to_node(addr) (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
147 #endif
148
149 #define virt_to_page(addr) ({ \
150 pfn_to_page(virt_to_pfn(addr)); \
151 })
152 #define page_to_virt(page) ({ \
153 pfn_to_virt(page_to_pfn(page)); \
154 })
155
156 #ifdef CONFIG_DISCONTIGMEM
157 #define pfn_to_page(pfn) ({ \
158 unsigned long __pfn = (pfn); \
159 struct pglist_data *pgdat; \
160 pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn)); \
161 pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn); \
162 })
163 #define page_to_pfn(_page) ({ \
164 const struct page *__p = (_page); \
165 struct pglist_data *pgdat; \
166 pgdat = &pg_data_map[page_to_nid(__p)]; \
167 ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn; \
168 })
169 #else
170 #define ARCH_PFN_OFFSET (m68k_memory[0].addr >> PAGE_SHIFT)
171 #include <asm-generic/memory_model.h>
172 #endif
173
174 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
175 #define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn))
176
177 #endif /* __ASSEMBLY__ */
178
179 #endif /* _M68K_PAGE_MM_H */
180