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
flush_tlb_kernel_page(void * addr)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 mm_segment_t old_fs = get_fs();
17 set_fs(KERNEL_DS);
18 __asm__ __volatile__(".chip 68040\n\t"
19 "pflush (%0)\n\t"
20 ".chip 68k"
21 : : "a" (addr));
22 set_fs(old_fs);
23 } else if (CPU_IS_020_OR_030)
24 __asm__ __volatile__("pflush #4,#4,(%0)" : : "a" (addr));
25 }
26
27 /*
28 * flush all user-space atc entries.
29 */
__flush_tlb(void)30 static inline void __flush_tlb(void)
31 {
32 if (CPU_IS_COLDFIRE) {
33 mmu_write(MMUOR, MMUOR_CNL);
34 } else if (CPU_IS_040_OR_060) {
35 __asm__ __volatile__(".chip 68040\n\t"
36 "pflushan\n\t"
37 ".chip 68k");
38 } else if (CPU_IS_020_OR_030) {
39 __asm__ __volatile__("pflush #0,#4");
40 }
41 }
42
__flush_tlb040_one(unsigned long addr)43 static inline void __flush_tlb040_one(unsigned long addr)
44 {
45 __asm__ __volatile__(".chip 68040\n\t"
46 "pflush (%0)\n\t"
47 ".chip 68k"
48 : : "a" (addr));
49 }
50
__flush_tlb_one(unsigned long addr)51 static inline void __flush_tlb_one(unsigned long addr)
52 {
53 if (CPU_IS_COLDFIRE)
54 mmu_write(MMUOR, MMUOR_CNL);
55 else if (CPU_IS_040_OR_060)
56 __flush_tlb040_one(addr);
57 else if (CPU_IS_020_OR_030)
58 __asm__ __volatile__("pflush #0,#4,(%0)" : : "a" (addr));
59 }
60
61 #define flush_tlb() __flush_tlb()
62
63 /*
64 * flush all atc entries (both kernel and user-space entries).
65 */
flush_tlb_all(void)66 static inline void flush_tlb_all(void)
67 {
68 if (CPU_IS_COLDFIRE) {
69 mmu_write(MMUOR, MMUOR_CNL);
70 } else if (CPU_IS_040_OR_060) {
71 __asm__ __volatile__(".chip 68040\n\t"
72 "pflusha\n\t"
73 ".chip 68k");
74 } else if (CPU_IS_020_OR_030) {
75 __asm__ __volatile__("pflusha");
76 }
77 }
78
flush_tlb_mm(struct mm_struct * mm)79 static inline void flush_tlb_mm(struct mm_struct *mm)
80 {
81 if (mm == current->active_mm)
82 __flush_tlb();
83 }
84
flush_tlb_page(struct vm_area_struct * vma,unsigned long addr)85 static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
86 {
87 if (vma->vm_mm == current->active_mm) {
88 mm_segment_t old_fs = force_uaccess_begin();
89
90 __flush_tlb_one(addr);
91 force_uaccess_end(old_fs);
92 }
93 }
94
flush_tlb_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)95 static inline void flush_tlb_range(struct vm_area_struct *vma,
96 unsigned long start, unsigned long end)
97 {
98 if (vma->vm_mm == current->active_mm)
99 __flush_tlb();
100 }
101
flush_tlb_kernel_range(unsigned long start,unsigned long end)102 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
103 {
104 flush_tlb_all();
105 }
106
107 #else
108
109
110 /* Reserved PMEGs. */
111 extern char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
112 extern unsigned long pmeg_vaddr[SUN3_PMEGS_NUM];
113 extern unsigned char pmeg_alloc[SUN3_PMEGS_NUM];
114 extern unsigned char pmeg_ctx[SUN3_PMEGS_NUM];
115
116 /* Flush all userspace mappings one by one... (why no flush command,
117 sun?) */
flush_tlb_all(void)118 static inline void flush_tlb_all(void)
119 {
120 unsigned long addr;
121 unsigned char ctx, oldctx;
122
123 oldctx = sun3_get_context();
124 for(addr = 0x00000000; addr < TASK_SIZE; addr += SUN3_PMEG_SIZE) {
125 for(ctx = 0; ctx < 8; ctx++) {
126 sun3_put_context(ctx);
127 sun3_put_segmap(addr, SUN3_INVALID_PMEG);
128 }
129 }
130
131 sun3_put_context(oldctx);
132 /* erase all of the userspace pmeg maps, we've clobbered them
133 all anyway */
134 for(addr = 0; addr < SUN3_INVALID_PMEG; addr++) {
135 if(pmeg_alloc[addr] == 1) {
136 pmeg_alloc[addr] = 0;
137 pmeg_ctx[addr] = 0;
138 pmeg_vaddr[addr] = 0;
139 }
140 }
141
142 }
143
144 /* Clear user TLB entries within the context named in mm */
flush_tlb_mm(struct mm_struct * mm)145 static inline void flush_tlb_mm (struct mm_struct *mm)
146 {
147 unsigned char oldctx;
148 unsigned char seg;
149 unsigned long i;
150
151 oldctx = sun3_get_context();
152 sun3_put_context(mm->context);
153
154 for(i = 0; i < TASK_SIZE; i += SUN3_PMEG_SIZE) {
155 seg = sun3_get_segmap(i);
156 if(seg == SUN3_INVALID_PMEG)
157 continue;
158
159 sun3_put_segmap(i, SUN3_INVALID_PMEG);
160 pmeg_alloc[seg] = 0;
161 pmeg_ctx[seg] = 0;
162 pmeg_vaddr[seg] = 0;
163 }
164
165 sun3_put_context(oldctx);
166
167 }
168
169 /* Flush a single TLB page. In this case, we're limited to flushing a
170 single PMEG */
flush_tlb_page(struct vm_area_struct * vma,unsigned long addr)171 static inline void flush_tlb_page (struct vm_area_struct *vma,
172 unsigned long addr)
173 {
174 unsigned char oldctx;
175 unsigned char i;
176
177 oldctx = sun3_get_context();
178 sun3_put_context(vma->vm_mm->context);
179 addr &= ~SUN3_PMEG_MASK;
180 if((i = sun3_get_segmap(addr)) != SUN3_INVALID_PMEG)
181 {
182 pmeg_alloc[i] = 0;
183 pmeg_ctx[i] = 0;
184 pmeg_vaddr[i] = 0;
185 sun3_put_segmap (addr, SUN3_INVALID_PMEG);
186 }
187 sun3_put_context(oldctx);
188
189 }
190 /* Flush a range of pages from TLB. */
191
flush_tlb_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)192 static inline void flush_tlb_range (struct vm_area_struct *vma,
193 unsigned long start, unsigned long end)
194 {
195 struct mm_struct *mm = vma->vm_mm;
196 unsigned char seg, oldctx;
197
198 start &= ~SUN3_PMEG_MASK;
199
200 oldctx = sun3_get_context();
201 sun3_put_context(mm->context);
202
203 while(start < end)
204 {
205 if((seg = sun3_get_segmap(start)) == SUN3_INVALID_PMEG)
206 goto next;
207 if(pmeg_ctx[seg] == mm->context) {
208 pmeg_alloc[seg] = 0;
209 pmeg_ctx[seg] = 0;
210 pmeg_vaddr[seg] = 0;
211 }
212 sun3_put_segmap(start, SUN3_INVALID_PMEG);
213 next:
214 start += SUN3_PMEG_SIZE;
215 }
216 }
217
flush_tlb_kernel_range(unsigned long start,unsigned long end)218 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
219 {
220 flush_tlb_all();
221 }
222
223 /* Flush kernel page from TLB. */
flush_tlb_kernel_page(unsigned long addr)224 static inline void flush_tlb_kernel_page (unsigned long addr)
225 {
226 sun3_put_segmap (addr & ~(SUN3_PMEG_SIZE - 1), SUN3_INVALID_PMEG);
227 }
228
229 #endif
230
231 #else /* !CONFIG_MMU */
232
233 /*
234 * flush all user-space atc entries.
235 */
__flush_tlb(void)236 static inline void __flush_tlb(void)
237 {
238 BUG();
239 }
240
__flush_tlb_one(unsigned long addr)241 static inline void __flush_tlb_one(unsigned long addr)
242 {
243 BUG();
244 }
245
246 #define flush_tlb() __flush_tlb()
247
248 /*
249 * flush all atc entries (both kernel and user-space entries).
250 */
flush_tlb_all(void)251 static inline void flush_tlb_all(void)
252 {
253 BUG();
254 }
255
flush_tlb_mm(struct mm_struct * mm)256 static inline void flush_tlb_mm(struct mm_struct *mm)
257 {
258 BUG();
259 }
260
flush_tlb_page(struct vm_area_struct * vma,unsigned long addr)261 static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
262 {
263 BUG();
264 }
265
flush_tlb_range(struct mm_struct * mm,unsigned long start,unsigned long end)266 static inline void flush_tlb_range(struct mm_struct *mm,
267 unsigned long start, unsigned long end)
268 {
269 BUG();
270 }
271
flush_tlb_kernel_page(unsigned long addr)272 static inline void flush_tlb_kernel_page(unsigned long addr)
273 {
274 BUG();
275 }
276
277 #endif /* CONFIG_MMU */
278
279 #endif /* _M68K_TLBFLUSH_H */
280
