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94cff60a TS |
1 | /* |
2 | * CRIS mmu emulation. | |
3 | * | |
4 | * Copyright (c) 2007 AXIS Communications AB | |
5 | * Written by Edgar E. Iglesias. | |
6 | * | |
7 | * This library is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with this library; if not, write to the Free Software | |
fad6cb1a | 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA |
94cff60a TS |
20 | */ |
21 | ||
22 | #ifndef CONFIG_USER_ONLY | |
23 | ||
24 | #include <stdio.h> | |
25 | #include <string.h> | |
26 | #include <stdlib.h> | |
27 | ||
28 | #include "config.h" | |
29 | #include "cpu.h" | |
30 | #include "mmu.h" | |
31 | #include "exec-all.h" | |
32 | ||
d297f464 EI |
33 | #ifdef DEBUG |
34 | #define D(x) x | |
93fcfe39 | 35 | #define D_LOG(...) qemu_log(__VA__ARGS__) |
d297f464 | 36 | #else |
786c02f1 | 37 | #define D(x) |
d12d51d5 | 38 | #define D_LOG(...) do { } while (0) |
d297f464 | 39 | #endif |
94cff60a | 40 | |
44cd42ee EI |
41 | void cris_mmu_init(CPUState *env) |
42 | { | |
43 | env->mmu_rand_lfsr = 0xcccc; | |
44 | } | |
45 | ||
46 | #define SR_POLYNOM 0x8805 | |
47 | static inline unsigned int compute_polynom(unsigned int sr) | |
48 | { | |
49 | unsigned int i; | |
50 | unsigned int f; | |
51 | ||
52 | f = 0; | |
53 | for (i = 0; i < 16; i++) | |
54 | f += ((SR_POLYNOM >> i) & 1) & ((sr >> i) & 1); | |
55 | ||
56 | return f; | |
57 | } | |
58 | ||
ef29a70d | 59 | static inline int cris_mmu_enabled(uint32_t rw_gc_cfg) |
94cff60a TS |
60 | { |
61 | return (rw_gc_cfg & 12) != 0; | |
62 | } | |
63 | ||
ef29a70d | 64 | static inline int cris_mmu_segmented_addr(int seg, uint32_t rw_mm_cfg) |
94cff60a TS |
65 | { |
66 | return (1 << seg) & rw_mm_cfg; | |
67 | } | |
68 | ||
69 | static uint32_t cris_mmu_translate_seg(CPUState *env, int seg) | |
70 | { | |
71 | uint32_t base; | |
72 | int i; | |
73 | ||
74 | if (seg < 8) | |
75 | base = env->sregs[SFR_RW_MM_KBASE_LO]; | |
76 | else | |
77 | base = env->sregs[SFR_RW_MM_KBASE_HI]; | |
78 | ||
79 | i = seg & 7; | |
80 | base >>= i * 4; | |
81 | base &= 15; | |
82 | ||
83 | base <<= 28; | |
84 | return base; | |
85 | } | |
86 | /* Used by the tlb decoder. */ | |
87 | #define EXTRACT_FIELD(src, start, end) \ | |
786c02f1 EI |
88 | (((src) >> start) & ((1 << (end - start + 1)) - 1)) |
89 | ||
90 | static inline void set_field(uint32_t *dst, unsigned int val, | |
91 | unsigned int offset, unsigned int width) | |
92 | { | |
93 | uint32_t mask; | |
94 | ||
95 | mask = (1 << width) - 1; | |
96 | mask <<= offset; | |
97 | val <<= offset; | |
98 | ||
99 | val &= mask; | |
786c02f1 EI |
100 | *dst &= ~(mask); |
101 | *dst |= val; | |
102 | } | |
94cff60a | 103 | |
d297f464 | 104 | #ifdef DEBUG |
b41f7df0 EI |
105 | static void dump_tlb(CPUState *env, int mmu) |
106 | { | |
107 | int set; | |
108 | int idx; | |
109 | uint32_t hi, lo, tlb_vpn, tlb_pfn; | |
110 | ||
111 | for (set = 0; set < 4; set++) { | |
112 | for (idx = 0; idx < 16; idx++) { | |
113 | lo = env->tlbsets[mmu][set][idx].lo; | |
114 | hi = env->tlbsets[mmu][set][idx].hi; | |
115 | tlb_vpn = EXTRACT_FIELD(hi, 13, 31); | |
116 | tlb_pfn = EXTRACT_FIELD(lo, 13, 31); | |
117 | ||
118 | printf ("TLB: [%d][%d] hi=%x lo=%x v=%x p=%x\n", | |
119 | set, idx, hi, lo, tlb_vpn, tlb_pfn); | |
120 | } | |
121 | } | |
122 | } | |
d297f464 | 123 | #endif |
b41f7df0 EI |
124 | |
125 | /* rw 0 = read, 1 = write, 2 = exec. */ | |
94cff60a TS |
126 | static int cris_mmu_translate_page(struct cris_mmu_result_t *res, |
127 | CPUState *env, uint32_t vaddr, | |
128 | int rw, int usermode) | |
129 | { | |
130 | unsigned int vpage; | |
131 | unsigned int idx; | |
b23761f9 | 132 | uint32_t pid, lo, hi; |
786c02f1 EI |
133 | uint32_t tlb_vpn, tlb_pfn = 0; |
134 | int tlb_pid, tlb_g, tlb_v, tlb_k, tlb_w, tlb_x; | |
135 | int cfg_v, cfg_k, cfg_w, cfg_x; | |
b41f7df0 | 136 | int set, match = 0; |
786c02f1 EI |
137 | uint32_t r_cause; |
138 | uint32_t r_cfg; | |
139 | int rwcause; | |
b41f7df0 EI |
140 | int mmu = 1; /* Data mmu is default. */ |
141 | int vect_base; | |
786c02f1 EI |
142 | |
143 | r_cause = env->sregs[SFR_R_MM_CAUSE]; | |
144 | r_cfg = env->sregs[SFR_RW_MM_CFG]; | |
28de16da | 145 | pid = env->pregs[PR_PID] & 0xff; |
b41f7df0 EI |
146 | |
147 | switch (rw) { | |
148 | case 2: rwcause = CRIS_MMU_ERR_EXEC; mmu = 0; break; | |
149 | case 1: rwcause = CRIS_MMU_ERR_WRITE; break; | |
150 | default: | |
151 | case 0: rwcause = CRIS_MMU_ERR_READ; break; | |
152 | } | |
153 | ||
154 | /* I exception vectors 4 - 7, D 8 - 11. */ | |
155 | vect_base = (mmu + 1) * 4; | |
94cff60a TS |
156 | |
157 | vpage = vaddr >> 13; | |
94cff60a TS |
158 | |
159 | /* We know the index which to check on each set. | |
160 | Scan both I and D. */ | |
786c02f1 | 161 | #if 0 |
b41f7df0 EI |
162 | for (set = 0; set < 4; set++) { |
163 | for (idx = 0; idx < 16; idx++) { | |
164 | lo = env->tlbsets[mmu][set][idx].lo; | |
165 | hi = env->tlbsets[mmu][set][idx].hi; | |
786c02f1 EI |
166 | tlb_vpn = EXTRACT_FIELD(hi, 13, 31); |
167 | tlb_pfn = EXTRACT_FIELD(lo, 13, 31); | |
168 | ||
169 | printf ("TLB: [%d][%d] hi=%x lo=%x v=%x p=%x\n", | |
b41f7df0 | 170 | set, idx, hi, lo, tlb_vpn, tlb_pfn); |
786c02f1 EI |
171 | } |
172 | } | |
173 | #endif | |
b41f7df0 EI |
174 | |
175 | idx = vpage & 15; | |
176 | for (set = 0; set < 4; set++) | |
94cff60a | 177 | { |
b41f7df0 EI |
178 | lo = env->tlbsets[mmu][set][idx].lo; |
179 | hi = env->tlbsets[mmu][set][idx].hi; | |
94cff60a | 180 | |
b23761f9 | 181 | tlb_vpn = hi >> 13; |
44cd42ee | 182 | tlb_pid = EXTRACT_FIELD(hi, 0, 7); |
44cd42ee | 183 | tlb_g = EXTRACT_FIELD(lo, 4, 4); |
94cff60a | 184 | |
d12d51d5 AL |
185 | D_LOG("TLB[%d][%d][%d] v=%x vpage=%x lo=%x hi=%x\n", |
186 | mmu, set, idx, tlb_vpn, vpage, lo, hi); | |
b23761f9 | 187 | if ((tlb_g || (tlb_pid == pid)) |
44cd42ee | 188 | && tlb_vpn == vpage) { |
94cff60a TS |
189 | match = 1; |
190 | break; | |
191 | } | |
192 | } | |
193 | ||
b41f7df0 | 194 | res->bf_vec = vect_base; |
94cff60a | 195 | if (match) { |
786c02f1 EI |
196 | cfg_w = EXTRACT_FIELD(r_cfg, 19, 19); |
197 | cfg_k = EXTRACT_FIELD(r_cfg, 18, 18); | |
198 | cfg_x = EXTRACT_FIELD(r_cfg, 17, 17); | |
199 | cfg_v = EXTRACT_FIELD(r_cfg, 16, 16); | |
200 | ||
786c02f1 | 201 | tlb_pfn = EXTRACT_FIELD(lo, 13, 31); |
786c02f1 EI |
202 | tlb_v = EXTRACT_FIELD(lo, 3, 3); |
203 | tlb_k = EXTRACT_FIELD(lo, 2, 2); | |
204 | tlb_w = EXTRACT_FIELD(lo, 1, 1); | |
205 | tlb_x = EXTRACT_FIELD(lo, 0, 0); | |
206 | ||
207 | /* | |
208 | set_exception_vector(0x04, i_mmu_refill); | |
209 | set_exception_vector(0x05, i_mmu_invalid); | |
210 | set_exception_vector(0x06, i_mmu_access); | |
211 | set_exception_vector(0x07, i_mmu_execute); | |
212 | set_exception_vector(0x08, d_mmu_refill); | |
213 | set_exception_vector(0x09, d_mmu_invalid); | |
214 | set_exception_vector(0x0a, d_mmu_access); | |
215 | set_exception_vector(0x0b, d_mmu_write); | |
216 | */ | |
44cd42ee | 217 | if (cfg_k && tlb_k && usermode) { |
ef29a70d EI |
218 | D(printf ("tlb: kernel protected %x lo=%x pc=%x\n", |
219 | vaddr, lo, env->pc)); | |
220 | match = 0; | |
221 | res->bf_vec = vect_base + 2; | |
b41f7df0 | 222 | } else if (rw == 1 && cfg_w && !tlb_w) { |
ef29a70d EI |
223 | D(printf ("tlb: write protected %x lo=%x pc=%x\n", |
224 | vaddr, lo, env->pc)); | |
225 | match = 0; | |
226 | /* write accesses never go through the I mmu. */ | |
227 | res->bf_vec = vect_base + 3; | |
228 | } else if (rw == 2 && cfg_x && !tlb_x) { | |
229 | D(printf ("tlb: exec protected %x lo=%x pc=%x\n", | |
230 | vaddr, lo, env->pc)); | |
786c02f1 | 231 | match = 0; |
b41f7df0 EI |
232 | res->bf_vec = vect_base + 3; |
233 | } else if (cfg_v && !tlb_v) { | |
234 | D(printf ("tlb: invalid %x\n", vaddr)); | |
786c02f1 | 235 | match = 0; |
b41f7df0 | 236 | res->bf_vec = vect_base + 1; |
786c02f1 | 237 | } |
786c02f1 | 238 | |
b41f7df0 EI |
239 | res->prot = 0; |
240 | if (match) { | |
241 | res->prot |= PAGE_READ; | |
242 | if (tlb_w) | |
243 | res->prot |= PAGE_WRITE; | |
244 | if (tlb_x) | |
245 | res->prot |= PAGE_EXEC; | |
246 | } | |
247 | else | |
248 | D(dump_tlb(env, mmu)); | |
44cd42ee EI |
249 | } else { |
250 | /* If refill, provide a randomized set. */ | |
251 | set = env->mmu_rand_lfsr & 3; | |
786c02f1 EI |
252 | } |
253 | ||
254 | if (!match) { | |
44cd42ee EI |
255 | unsigned int f; |
256 | ||
257 | /* Update lfsr at every fault. */ | |
258 | f = compute_polynom(env->mmu_rand_lfsr); | |
259 | env->mmu_rand_lfsr >>= 1; | |
260 | env->mmu_rand_lfsr |= (f << 15); | |
261 | env->mmu_rand_lfsr &= 0xffff; | |
262 | ||
263 | /* Compute index. */ | |
b41f7df0 | 264 | idx = vpage & 15; |
b41f7df0 EI |
265 | |
266 | /* Update RW_MM_TLB_SEL. */ | |
267 | env->sregs[SFR_RW_MM_TLB_SEL] = 0; | |
268 | set_field(&env->sregs[SFR_RW_MM_TLB_SEL], idx, 0, 4); | |
44cd42ee | 269 | set_field(&env->sregs[SFR_RW_MM_TLB_SEL], set, 4, 2); |
b41f7df0 EI |
270 | |
271 | /* Update RW_MM_CAUSE. */ | |
272 | set_field(&r_cause, rwcause, 8, 2); | |
786c02f1 | 273 | set_field(&r_cause, vpage, 13, 19); |
28de16da | 274 | set_field(&r_cause, pid, 0, 8); |
786c02f1 | 275 | env->sregs[SFR_R_MM_CAUSE] = r_cause; |
b41f7df0 | 276 | D(printf("refill vaddr=%x pc=%x\n", vaddr, env->pc)); |
94cff60a | 277 | } |
b41f7df0 | 278 | |
b41f7df0 EI |
279 | D(printf ("%s rw=%d mtch=%d pc=%x va=%x vpn=%x tlbvpn=%x pfn=%x pid=%x" |
280 | " %x cause=%x sel=%x sp=%x %x %x\n", | |
281 | __func__, rw, match, env->pc, | |
786c02f1 EI |
282 | vaddr, vpage, |
283 | tlb_vpn, tlb_pfn, tlb_pid, | |
28de16da | 284 | pid, |
786c02f1 EI |
285 | r_cause, |
286 | env->sregs[SFR_RW_MM_TLB_SEL], | |
b41f7df0 | 287 | env->regs[R_SP], env->pregs[PR_USP], env->ksp)); |
786c02f1 | 288 | |
bf91ada5 | 289 | res->phy = tlb_pfn << TARGET_PAGE_BITS; |
94cff60a TS |
290 | return !match; |
291 | } | |
292 | ||
cf1d97f0 | 293 | void cris_mmu_flush_pid(CPUState *env, uint32_t pid) |
786c02f1 | 294 | { |
cf1d97f0 EI |
295 | target_ulong vaddr; |
296 | unsigned int idx; | |
297 | uint32_t lo, hi; | |
298 | uint32_t tlb_vpn; | |
80e1b265 | 299 | int tlb_pid, tlb_g, tlb_v; |
cf1d97f0 EI |
300 | unsigned int set; |
301 | unsigned int mmu; | |
302 | ||
303 | pid &= 0xff; | |
304 | for (mmu = 0; mmu < 2; mmu++) { | |
305 | for (set = 0; set < 4; set++) | |
306 | { | |
307 | for (idx = 0; idx < 16; idx++) { | |
308 | lo = env->tlbsets[mmu][set][idx].lo; | |
309 | hi = env->tlbsets[mmu][set][idx].hi; | |
310 | ||
311 | tlb_vpn = EXTRACT_FIELD(hi, 13, 31); | |
312 | tlb_pid = EXTRACT_FIELD(hi, 0, 7); | |
313 | tlb_g = EXTRACT_FIELD(lo, 4, 4); | |
314 | tlb_v = EXTRACT_FIELD(lo, 3, 3); | |
cf1d97f0 | 315 | |
80e1b265 | 316 | if (tlb_v && !tlb_g && (tlb_pid == pid)) { |
cf1d97f0 | 317 | vaddr = tlb_vpn << TARGET_PAGE_BITS; |
d12d51d5 AL |
318 | D_LOG("flush pid=%x vaddr=%x\n", |
319 | pid, vaddr); | |
cf1d97f0 EI |
320 | tlb_flush_page(env, vaddr); |
321 | } | |
322 | } | |
323 | } | |
324 | } | |
786c02f1 EI |
325 | } |
326 | ||
94cff60a TS |
327 | int cris_mmu_translate(struct cris_mmu_result_t *res, |
328 | CPUState *env, uint32_t vaddr, | |
6ebbf390 | 329 | int rw, int mmu_idx) |
94cff60a TS |
330 | { |
331 | uint32_t phy = vaddr; | |
332 | int seg; | |
333 | int miss = 0; | |
786c02f1 | 334 | int is_user = mmu_idx == MMU_USER_IDX; |
b41f7df0 EI |
335 | uint32_t old_srs; |
336 | ||
337 | old_srs= env->pregs[PR_SRS]; | |
338 | ||
339 | /* rw == 2 means exec, map the access to the insn mmu. */ | |
340 | env->pregs[PR_SRS] = rw == 2 ? 1 : 2; | |
94cff60a TS |
341 | |
342 | if (!cris_mmu_enabled(env->sregs[SFR_RW_GC_CFG])) { | |
343 | res->phy = vaddr; | |
b23761f9 | 344 | res->prot = PAGE_BITS; |
b41f7df0 | 345 | goto done; |
94cff60a TS |
346 | } |
347 | ||
348 | seg = vaddr >> 28; | |
349 | if (cris_mmu_segmented_addr(seg, env->sregs[SFR_RW_MM_CFG])) | |
350 | { | |
351 | uint32_t base; | |
352 | ||
353 | miss = 0; | |
354 | base = cris_mmu_translate_seg(env, seg); | |
355 | phy = base | (0x0fffffff & vaddr); | |
356 | res->phy = phy; | |
b23761f9 | 357 | res->prot = PAGE_BITS; |
94cff60a TS |
358 | } |
359 | else | |
94cff60a | 360 | miss = cris_mmu_translate_page(res, env, vaddr, rw, is_user); |
b41f7df0 EI |
361 | done: |
362 | env->pregs[PR_SRS] = old_srs; | |
94cff60a TS |
363 | return miss; |
364 | } | |
365 | #endif |