1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _M68K_TLBFLUSH_H
3 #define _M68K_TLBFLUSH_H
4
5 #ifdef CONFIG_MMU
6 #ifndef CONFIG_SUN3
7
8 #include <asm/current.h>
9 #include <asm/mcfmmu.h>
10
11 static inline void flush_tlb_kernel_page(void *addr)
12 {
13 if (CPU_IS_COLDFIRE) {
14 mmu_write(MMUOR, MMUOR_CNL);
15 } else if (CPU_IS_040_OR_060) {
16 set_fc(SUPER_DATA);
17 __asm__ __volatile__(".chip 68040\n\t"
18 "pflush (%0)\n\t"
19 ".chip 68k"
20 : : "a" (addr));
21 set_fc(USER_DATA);
22 } else if (CPU_IS_020_OR_030)
23 __asm__ __volatile__("pflush #4,#4,(%0)" : : "a" (addr));
24 }
25
26 /*
27 * flush all user-space atc entries.
28 */
29 static inline void __flush_tlb(void)
30 {
31 if (CPU_IS_COLDFIRE) {
32 mmu_write(MMUOR, MMUOR_CNL);
33 } else if (CPU_IS_040_OR_060) {
34 __asm__ __volatile__(".chip 68040\n\t"
35 "pflushan\n\t"
36 ".chip 68k");
37 } else if (CPU_IS_020_OR_030) {
38 __asm__ __volatile__("pflush #0,#4");
39 }
40 }
41
42 static inline void __flush_tlb040_one(unsigned long addr)
43 {
44 __asm__ __volatile__(".chip 68040\n\t"
45 "pflush (%0)\n\t"
46 ".chip 68k"
47 : : "a" (addr));
48 }
49
50 static inline void __flush_tlb_one(unsigned long addr)
51 {
52 if (CPU_IS_COLDFIRE)
53 mmu_write(MMUOR, MMUOR_CNL);
54 else if (CPU_IS_040_OR_060)
55 __flush_tlb040_one(addr);
56 else if (CPU_IS_020_OR_030)
57 __asm__ __volatile__("pflush #0,#4,(%0)" : : "a" (addr));
58 }
59
60 #define flush_tlb() __flush_tlb()
61
62 /*
63 * flush all atc entries (both kernel and user-space entries).
64 */
65 static inline void flush_tlb_all(void)
66 {
67 if (CPU_IS_COLDFIRE) {
68 mmu_write(MMUOR, MMUOR_CNL);
69 } else if (CPU_IS_040_OR_060) {
70 __asm__ __volatile__(".chip 68040\n\t"
71 "pflusha\n\t"
72 ".chip 68k");
73 } else if (CPU_IS_020_OR_030) {
74 __asm__ __volatile__("pflusha");
75 }
76 }
77
78 static inline void flush_tlb_mm(struct mm_struct *mm)
79 {
80 if (mm == current->active_mm)
81 __flush_tlb();
82 }
83
84 static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
85 {
86 if (vma->vm_mm == current->active_mm)
87 __flush_tlb_one(addr);
88 }
89
90 static inline void flush_tlb_range(struct vm_area_struct *vma,
91 unsigned long start, unsigned long end)
92 {
93 if (vma->vm_mm == current->active_mm)
94 __flush_tlb();
95 }
96
97 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
98 {
99 flush_tlb_all();
100 }
101
102 #else
103
104
105 /* Reserved PMEGs. */
106 extern char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
107 extern unsigned long pmeg_vaddr[SUN3_PMEGS_NUM];
108 extern unsigned char pmeg_alloc[SUN3_PMEGS_NUM];
109 extern unsigned char pmeg_ctx[SUN3_PMEGS_NUM];
110
111 /* Flush all userspace mappings one by one... (why no flush command,
112 sun?) */
113 static inline void flush_tlb_all(void)
114 {
115 unsigned long addr;
116 unsigned char ctx, oldctx;
117
118 oldctx = sun3_get_context();
119 for (addr = 0x00000000; addr < TASK_SIZE; addr += SUN3_PMEG_SIZE) {
120 for (ctx = 0; ctx < 8; ctx++) {
121 sun3_put_context(ctx);
122 sun3_put_segmap(addr, SUN3_INVALID_PMEG);
123 }
124 }
125
126 sun3_put_context(oldctx);
127 /* erase all of the userspace pmeg maps, we've clobbered them
128 all anyway */
129 for (addr = 0; addr < SUN3_INVALID_PMEG; addr++) {
130 if (pmeg_alloc[addr] == 1) {
131 pmeg_alloc[addr] = 0;
132 pmeg_ctx[addr] = 0;
133 pmeg_vaddr[addr] = 0;
134 }
135 }
136 }
137
138 /* Clear user TLB entries within the context named in mm */
139 static inline void flush_tlb_mm (struct mm_struct *mm)
140 {
141 unsigned char oldctx;
142 unsigned char seg;
143 unsigned long i;
144
145 oldctx = sun3_get_context();
146 sun3_put_context(mm->context);
147
148 for (i = 0; i < TASK_SIZE; i += SUN3_PMEG_SIZE) {
149 seg = sun3_get_segmap(i);
150 if (seg == SUN3_INVALID_PMEG)
151 continue;
152
153 sun3_put_segmap(i, SUN3_INVALID_PMEG);
154 pmeg_alloc[seg] = 0;
155 pmeg_ctx[seg] = 0;
156 pmeg_vaddr[seg] = 0;
157 }
158
159 sun3_put_context(oldctx);
160 }
161
162 /* Flush a single TLB page. In this case, we're limited to flushing a
163 single PMEG */
164 static inline void flush_tlb_page (struct vm_area_struct *vma,
165 unsigned long addr)
166 {
167 unsigned char oldctx;
168 unsigned char i;
169
170 oldctx = sun3_get_context();
171 sun3_put_context(vma->vm_mm->context);
172 addr &= ~SUN3_PMEG_MASK;
173 if((i = sun3_get_segmap(addr)) != SUN3_INVALID_PMEG)
174 {
175 pmeg_alloc[i] = 0;
176 pmeg_ctx[i] = 0;
177 pmeg_vaddr[i] = 0;
178 sun3_put_segmap (addr, SUN3_INVALID_PMEG);
179 }
180 sun3_put_context(oldctx);
181
182 }
183 /* Flush a range of pages from TLB. */
184
185 static inline void flush_tlb_range (struct vm_area_struct *vma,
186 unsigned long start, unsigned long end)
187 {
188 struct mm_struct *mm = vma->vm_mm;
189 unsigned char seg, oldctx;
190
191 start &= ~SUN3_PMEG_MASK;
192
193 oldctx = sun3_get_context();
194 sun3_put_context(mm->context);
195
196 while(start < end)
197 {
198 if((seg = sun3_get_segmap(start)) == SUN3_INVALID_PMEG)
199 goto next;
200 if(pmeg_ctx[seg] == mm->context) {
201 pmeg_alloc[seg] = 0;
202 pmeg_ctx[seg] = 0;
203 pmeg_vaddr[seg] = 0;
204 }
205 sun3_put_segmap(start, SUN3_INVALID_PMEG);
206 next:
207 start += SUN3_PMEG_SIZE;
208 }
209 sun3_put_context(oldctx);
210 }
211
212 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
213 {
214 flush_tlb_all();
215 }
216
217 /* Flush kernel page from TLB. */
218 static inline void flush_tlb_kernel_page (unsigned long addr)
219 {
220 sun3_put_segmap (addr & ~(SUN3_PMEG_SIZE - 1), SUN3_INVALID_PMEG);
221 }
222
223 #endif
224
225 #else /* !CONFIG_MMU */
226
227 /*
228 * flush all user-space atc entries.
229 */
230 static inline void __flush_tlb(void)
231 {
232 BUG();
233 }
234
235 static inline void __flush_tlb_one(unsigned long addr)
236 {
237 BUG();
238 }
239
240 #define flush_tlb() __flush_tlb()
241
242 /*
243 * flush all atc entries (both kernel and user-space entries).
244 */
245 static inline void flush_tlb_all(void)
246 {
247 BUG();
248 }
249
250 static inline void flush_tlb_mm(struct mm_struct *mm)
251 {
252 BUG();
253 }
254
255 static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
256 {
257 BUG();
258 }
259
260 static inline void flush_tlb_range(struct vm_area_struct *vma,
261 unsigned long start, unsigned long end)
262 {
263 BUG();
264 }
265
266 static inline void flush_tlb_kernel_page(unsigned long addr)
267 {
268 BUG();
269 }
270
271 #endif /* CONFIG_MMU */
272
273 #endif /* _M68K_TLBFLUSH_H */
274
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