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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * r2300.c: R2000 and R3000 specific mmu/cache code.
4 *
5 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
6 *
7 * with a lot of changes to make this thing work for R3000s
8 * Tx39XX R4k style caches added. HK
9 * Copyright (C) 1998, 1999, 2000 Harald Koerfgen
10 * Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
11 * Copyright (C) 2002 Ralf Baechle
12 * Copyright (C) 2002 Maciej W. Rozycki
13 */
14#include <linux/kernel.h>
15#include <linux/sched.h>
16#include <linux/smp.h>
17#include <linux/mm.h>
18
19#include <asm/page.h>
20#include <asm/pgtable.h>
21#include <asm/mmu_context.h>
22#include <asm/tlbmisc.h>
23#include <asm/isadep.h>
24#include <asm/io.h>
25#include <asm/bootinfo.h>
26#include <asm/cpu.h>
27
28#undef DEBUG_TLB
29
30extern void build_tlb_refill_handler(void);
31
32/* CP0 hazard avoidance. */
33#define BARRIER \
34 __asm__ __volatile__( \
35 ".set push\n\t" \
36 ".set noreorder\n\t" \
37 "nop\n\t" \
38 ".set pop\n\t")
39
40int r3k_have_wired_reg; /* Should be in cpu_data? */
41
42/* TLB operations. */
43static void local_flush_tlb_from(int entry)
44{
45 unsigned long old_ctx;
46
47 old_ctx = read_c0_entryhi() & cpu_asid_mask(¤t_cpu_data);
48 write_c0_entrylo0(0);
49 while (entry < current_cpu_data.tlbsize) {
50 write_c0_index(entry << 8);
51 write_c0_entryhi((entry | 0x80000) << 12);
52 entry++; /* BARRIER */
53 tlb_write_indexed();
54 }
55 write_c0_entryhi(old_ctx);
56}
57
58void local_flush_tlb_all(void)
59{
60 unsigned long flags;
61
62#ifdef DEBUG_TLB
63 printk("[tlball]");
64#endif
65 local_irq_save(flags);
66 local_flush_tlb_from(r3k_have_wired_reg ? read_c0_wired() : 8);
67 local_irq_restore(flags);
68}
69
70void local_flush_tlb_mm(struct mm_struct *mm)
71{
72 int cpu = smp_processor_id();
73
74 if (cpu_context(cpu, mm) != 0) {
75#ifdef DEBUG_TLB
76 printk("[tlbmm<%lu>]", (unsigned long)cpu_context(cpu, mm));
77#endif
78 drop_mmu_context(mm, cpu);
79 }
80}
81
82void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
83 unsigned long end)
84{
85 unsigned long asid_mask = cpu_asid_mask(¤t_cpu_data);
86 struct mm_struct *mm = vma->vm_mm;
87 int cpu = smp_processor_id();
88
89 if (cpu_context(cpu, mm) != 0) {
90 unsigned long size, flags;
91
92#ifdef DEBUG_TLB
93 printk("[tlbrange<%lu,0x%08lx,0x%08lx>]",
94 cpu_context(cpu, mm) & asid_mask, start, end);
95#endif
96 local_irq_save(flags);
97 size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
98 if (size <= current_cpu_data.tlbsize) {
99 int oldpid = read_c0_entryhi() & asid_mask;
100 int newpid = cpu_context(cpu, mm) & asid_mask;
101
102 start &= PAGE_MASK;
103 end += PAGE_SIZE - 1;
104 end &= PAGE_MASK;
105 while (start < end) {
106 int idx;
107
108 write_c0_entryhi(start | newpid);
109 start += PAGE_SIZE; /* BARRIER */
110 tlb_probe();
111 idx = read_c0_index();
112 write_c0_entrylo0(0);
113 write_c0_entryhi(KSEG0);
114 if (idx < 0) /* BARRIER */
115 continue;
116 tlb_write_indexed();
117 }
118 write_c0_entryhi(oldpid);
119 } else {
120 drop_mmu_context(mm, cpu);
121 }
122 local_irq_restore(flags);
123 }
124}
125
126void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
127{
128 unsigned long size, flags;
129
130#ifdef DEBUG_TLB
131 printk("[tlbrange<%lu,0x%08lx,0x%08lx>]", start, end);
132#endif
133 local_irq_save(flags);
134 size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
135 if (size <= current_cpu_data.tlbsize) {
136 int pid = read_c0_entryhi();
137
138 start &= PAGE_MASK;
139 end += PAGE_SIZE - 1;
140 end &= PAGE_MASK;
141
142 while (start < end) {
143 int idx;
144
145 write_c0_entryhi(start);
146 start += PAGE_SIZE; /* BARRIER */
147 tlb_probe();
148 idx = read_c0_index();
149 write_c0_entrylo0(0);
150 write_c0_entryhi(KSEG0);
151 if (idx < 0) /* BARRIER */
152 continue;
153 tlb_write_indexed();
154 }
155 write_c0_entryhi(pid);
156 } else {
157 local_flush_tlb_all();
158 }
159 local_irq_restore(flags);
160}
161
162void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
163{
164 unsigned long asid_mask = cpu_asid_mask(¤t_cpu_data);
165 int cpu = smp_processor_id();
166
167 if (cpu_context(cpu, vma->vm_mm) != 0) {
168 unsigned long flags;
169 int oldpid, newpid, idx;
170
171#ifdef DEBUG_TLB
172 printk("[tlbpage<%lu,0x%08lx>]", cpu_context(cpu, vma->vm_mm), page);
173#endif
174 newpid = cpu_context(cpu, vma->vm_mm) & asid_mask;
175 page &= PAGE_MASK;
176 local_irq_save(flags);
177 oldpid = read_c0_entryhi() & asid_mask;
178 write_c0_entryhi(page | newpid);
179 BARRIER;
180 tlb_probe();
181 idx = read_c0_index();
182 write_c0_entrylo0(0);
183 write_c0_entryhi(KSEG0);
184 if (idx < 0) /* BARRIER */
185 goto finish;
186 tlb_write_indexed();
187
188finish:
189 write_c0_entryhi(oldpid);
190 local_irq_restore(flags);
191 }
192}
193
194void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
195{
196 unsigned long asid_mask = cpu_asid_mask(¤t_cpu_data);
197 unsigned long flags;
198 int idx, pid;
199
200 /*
201 * Handle debugger faulting in for debugee.
202 */
203 if (current->active_mm != vma->vm_mm)
204 return;
205
206 pid = read_c0_entryhi() & asid_mask;
207
208#ifdef DEBUG_TLB
209 if ((pid != (cpu_context(cpu, vma->vm_mm) & asid_mask)) || (cpu_context(cpu, vma->vm_mm) == 0)) {
210 printk("update_mmu_cache: Wheee, bogus tlbpid mmpid=%lu tlbpid=%d\n",
211 (cpu_context(cpu, vma->vm_mm)), pid);
212 }
213#endif
214
215 local_irq_save(flags);
216 address &= PAGE_MASK;
217 write_c0_entryhi(address | pid);
218 BARRIER;
219 tlb_probe();
220 idx = read_c0_index();
221 write_c0_entrylo0(pte_val(pte));
222 write_c0_entryhi(address | pid);
223 if (idx < 0) { /* BARRIER */
224 tlb_write_random();
225 } else {
226 tlb_write_indexed();
227 }
228 write_c0_entryhi(pid);
229 local_irq_restore(flags);
230}
231
232void add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
233 unsigned long entryhi, unsigned long pagemask)
234{
235 unsigned long asid_mask = cpu_asid_mask(¤t_cpu_data);
236 unsigned long flags;
237 unsigned long old_ctx;
238 static unsigned long wired = 0;
239
240 if (r3k_have_wired_reg) { /* TX39XX */
241 unsigned long old_pagemask;
242 unsigned long w;
243
244#ifdef DEBUG_TLB
245 printk("[tlbwired<entry lo0 %8x, hi %8x\n, pagemask %8x>]\n",
246 entrylo0, entryhi, pagemask);
247#endif
248
249 local_irq_save(flags);
250 /* Save old context and create impossible VPN2 value */
251 old_ctx = read_c0_entryhi() & asid_mask;
252 old_pagemask = read_c0_pagemask();
253 w = read_c0_wired();
254 write_c0_wired(w + 1);
255 write_c0_index(w << 8);
256 write_c0_pagemask(pagemask);
257 write_c0_entryhi(entryhi);
258 write_c0_entrylo0(entrylo0);
259 BARRIER;
260 tlb_write_indexed();
261
262 write_c0_entryhi(old_ctx);
263 write_c0_pagemask(old_pagemask);
264 local_flush_tlb_all();
265 local_irq_restore(flags);
266
267 } else if (wired < 8) {
268#ifdef DEBUG_TLB
269 printk("[tlbwired<entry lo0 %8x, hi %8x\n>]\n",
270 entrylo0, entryhi);
271#endif
272
273 local_irq_save(flags);
274 old_ctx = read_c0_entryhi() & asid_mask;
275 write_c0_entrylo0(entrylo0);
276 write_c0_entryhi(entryhi);
277 write_c0_index(wired);
278 wired++; /* BARRIER */
279 tlb_write_indexed();
280 write_c0_entryhi(old_ctx);
281 local_flush_tlb_all();
282 local_irq_restore(flags);
283 }
284}
285
286void tlb_init(void)
287{
288 switch (current_cpu_type()) {
289 case CPU_TX3922:
290 case CPU_TX3927:
291 r3k_have_wired_reg = 1;
292 write_c0_wired(0); /* Set to 8 on reset... */
293 break;
294 }
295 local_flush_tlb_from(0);
296 build_tlb_refill_handler();
297}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * r2300.c: R2000 and R3000 specific mmu/cache code.
4 *
5 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
6 *
7 * with a lot of changes to make this thing work for R3000s
8 * Tx39XX R4k style caches added. HK
9 * Copyright (C) 1998, 1999, 2000 Harald Koerfgen
10 * Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
11 * Copyright (C) 2002 Ralf Baechle
12 * Copyright (C) 2002 Maciej W. Rozycki
13 */
14#include <linux/kernel.h>
15#include <linux/sched.h>
16#include <linux/smp.h>
17#include <linux/mm.h>
18
19#include <asm/page.h>
20#include <asm/mmu_context.h>
21#include <asm/tlbmisc.h>
22#include <asm/isadep.h>
23#include <asm/io.h>
24#include <asm/bootinfo.h>
25#include <asm/cpu.h>
26
27#undef DEBUG_TLB
28
29extern void build_tlb_refill_handler(void);
30
31/* CP0 hazard avoidance. */
32#define BARRIER \
33 __asm__ __volatile__( \
34 ".set push\n\t" \
35 ".set noreorder\n\t" \
36 "nop\n\t" \
37 ".set pop\n\t")
38
39/* TLB operations. */
40static void local_flush_tlb_from(int entry)
41{
42 unsigned long old_ctx;
43
44 old_ctx = read_c0_entryhi() & cpu_asid_mask(¤t_cpu_data);
45 write_c0_entrylo0(0);
46 while (entry < current_cpu_data.tlbsize) {
47 write_c0_index(entry << 8);
48 write_c0_entryhi((entry | 0x80000) << 12);
49 entry++; /* BARRIER */
50 tlb_write_indexed();
51 }
52 write_c0_entryhi(old_ctx);
53}
54
55void local_flush_tlb_all(void)
56{
57 unsigned long flags;
58
59#ifdef DEBUG_TLB
60 printk("[tlball]");
61#endif
62 local_irq_save(flags);
63 local_flush_tlb_from(8);
64 local_irq_restore(flags);
65}
66
67void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
68 unsigned long end)
69{
70 unsigned long asid_mask = cpu_asid_mask(¤t_cpu_data);
71 struct mm_struct *mm = vma->vm_mm;
72 int cpu = smp_processor_id();
73
74 if (cpu_context(cpu, mm) != 0) {
75 unsigned long size, flags;
76
77#ifdef DEBUG_TLB
78 printk("[tlbrange<%lu,0x%08lx,0x%08lx>]",
79 cpu_context(cpu, mm) & asid_mask, start, end);
80#endif
81 local_irq_save(flags);
82 size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
83 if (size <= current_cpu_data.tlbsize) {
84 int oldpid = read_c0_entryhi() & asid_mask;
85 int newpid = cpu_context(cpu, mm) & asid_mask;
86
87 start &= PAGE_MASK;
88 end += PAGE_SIZE - 1;
89 end &= PAGE_MASK;
90 while (start < end) {
91 int idx;
92
93 write_c0_entryhi(start | newpid);
94 start += PAGE_SIZE; /* BARRIER */
95 tlb_probe();
96 idx = read_c0_index();
97 write_c0_entrylo0(0);
98 write_c0_entryhi(KSEG0);
99 if (idx < 0) /* BARRIER */
100 continue;
101 tlb_write_indexed();
102 }
103 write_c0_entryhi(oldpid);
104 } else {
105 drop_mmu_context(mm);
106 }
107 local_irq_restore(flags);
108 }
109}
110
111void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
112{
113 unsigned long size, flags;
114
115#ifdef DEBUG_TLB
116 printk("[tlbrange<%lu,0x%08lx,0x%08lx>]", start, end);
117#endif
118 local_irq_save(flags);
119 size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
120 if (size <= current_cpu_data.tlbsize) {
121 int pid = read_c0_entryhi();
122
123 start &= PAGE_MASK;
124 end += PAGE_SIZE - 1;
125 end &= PAGE_MASK;
126
127 while (start < end) {
128 int idx;
129
130 write_c0_entryhi(start);
131 start += PAGE_SIZE; /* BARRIER */
132 tlb_probe();
133 idx = read_c0_index();
134 write_c0_entrylo0(0);
135 write_c0_entryhi(KSEG0);
136 if (idx < 0) /* BARRIER */
137 continue;
138 tlb_write_indexed();
139 }
140 write_c0_entryhi(pid);
141 } else {
142 local_flush_tlb_all();
143 }
144 local_irq_restore(flags);
145}
146
147void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
148{
149 unsigned long asid_mask = cpu_asid_mask(¤t_cpu_data);
150 int cpu = smp_processor_id();
151
152 if (cpu_context(cpu, vma->vm_mm) != 0) {
153 unsigned long flags;
154 int oldpid, newpid, idx;
155
156#ifdef DEBUG_TLB
157 printk("[tlbpage<%lu,0x%08lx>]", cpu_context(cpu, vma->vm_mm), page);
158#endif
159 newpid = cpu_context(cpu, vma->vm_mm) & asid_mask;
160 page &= PAGE_MASK;
161 local_irq_save(flags);
162 oldpid = read_c0_entryhi() & asid_mask;
163 write_c0_entryhi(page | newpid);
164 BARRIER;
165 tlb_probe();
166 idx = read_c0_index();
167 write_c0_entrylo0(0);
168 write_c0_entryhi(KSEG0);
169 if (idx < 0) /* BARRIER */
170 goto finish;
171 tlb_write_indexed();
172
173finish:
174 write_c0_entryhi(oldpid);
175 local_irq_restore(flags);
176 }
177}
178
179void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
180{
181 unsigned long asid_mask = cpu_asid_mask(¤t_cpu_data);
182 unsigned long flags;
183 int idx, pid;
184
185 /*
186 * Handle debugger faulting in for debugee.
187 */
188 if (current->active_mm != vma->vm_mm)
189 return;
190
191 pid = read_c0_entryhi() & asid_mask;
192
193#ifdef DEBUG_TLB
194 if ((pid != (cpu_context(cpu, vma->vm_mm) & asid_mask)) || (cpu_context(cpu, vma->vm_mm) == 0)) {
195 printk("update_mmu_cache: Wheee, bogus tlbpid mmpid=%lu tlbpid=%d\n",
196 (cpu_context(cpu, vma->vm_mm)), pid);
197 }
198#endif
199
200 local_irq_save(flags);
201 address &= PAGE_MASK;
202 write_c0_entryhi(address | pid);
203 BARRIER;
204 tlb_probe();
205 idx = read_c0_index();
206 write_c0_entrylo0(pte_val(pte));
207 write_c0_entryhi(address | pid);
208 if (idx < 0) { /* BARRIER */
209 tlb_write_random();
210 } else {
211 tlb_write_indexed();
212 }
213 write_c0_entryhi(pid);
214 local_irq_restore(flags);
215}
216
217void add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
218 unsigned long entryhi, unsigned long pagemask)
219{
220 unsigned long asid_mask = cpu_asid_mask(¤t_cpu_data);
221 unsigned long flags;
222 unsigned long old_ctx;
223 static unsigned long wired = 0;
224
225 if (wired < 8) {
226#ifdef DEBUG_TLB
227 printk("[tlbwired<entry lo0 %8x, hi %8x\n>]\n",
228 entrylo0, entryhi);
229#endif
230
231 local_irq_save(flags);
232 old_ctx = read_c0_entryhi() & asid_mask;
233 write_c0_entrylo0(entrylo0);
234 write_c0_entryhi(entryhi);
235 write_c0_index(wired);
236 wired++; /* BARRIER */
237 tlb_write_indexed();
238 write_c0_entryhi(old_ctx);
239 local_flush_tlb_all();
240 local_irq_restore(flags);
241 }
242}
243
244void tlb_init(void)
245{
246 local_flush_tlb_from(0);
247 build_tlb_refill_handler();
248}