?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
jtag: add support for some probes that are mostly compatible with opendous
[openocd/ntfreak.git] / src / target / arm926ejs.c
blob6a076c1f902bc0f5cdb67b4a36dc2cf31eb4413d
1 /***************************************************************************
2 * Copyright (C) 2007 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2007,2008,2009 by Øyvind Harboe *
6 * oyvind.harboe@zylin.com *
7 * *
8 * This program is free software; you can redistribute it and/or modify *
9 * it under the terms of the GNU General Public License as published by *
10 * the Free Software Foundation; either version 2 of the License, or *
11 * (at your option) any later version. *
12 * *
13 * This program is distributed in the hope that it will be useful, *
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16 * GNU General Public License for more details. *
17 * *
18 * You should have received a copy of the GNU General Public License *
19 * along with this program; if not, write to the *
20 * Free Software Foundation, Inc., *
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
22 ***************************************************************************/
23
24 #ifdef HAVE_CONFIG_H
25 #include "config.h"
26 #endif
27
28 #include "arm926ejs.h"
29 #include <helper/time_support.h>
30 #include "target_type.h"
31 #include "register.h"
32 #include "arm_opcodes.h"
33
34
35 /*
36 * The ARM926 is built around the ARM9EJ-S core, and most JTAG docs
37 * are in the ARM9EJ-S Technical Reference Manual (ARM DDI 0222B) not
38 * the ARM926 manual (ARM DDI 0198E). The scan chains are:
39 *
40 * 1 ... core debugging
41 * 2 ... EmbeddedICE
42 * 3 ... external boundary scan (SoC-specific, unused here)
43 * 6 ... ETM
44 * 15 ... coprocessor 15
45 */
46
47 #if 0
48 #define _DEBUG_INSTRUCTION_EXECUTION_
49 #endif
50
51 #define ARM926EJS_CP15_ADDR(opcode_1, opcode_2, CRn, CRm) ((opcode_1 << 11) | (opcode_2 << 8) | (CRn << 4) | (CRm << 0))
52
53 static int arm926ejs_cp15_read(struct target *target, uint32_t op1, uint32_t op2,
54 uint32_t CRn, uint32_t CRm, uint32_t *value)
55 {
56 int retval = ERROR_OK;
57 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
58 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
59 uint32_t address = ARM926EJS_CP15_ADDR(op1, op2, CRn, CRm);
60 struct scan_field fields[4];
61 uint8_t address_buf[2] = {0, 0};
62 uint8_t nr_w_buf = 0;
63 uint8_t access_t = 1;
64
65 buf_set_u32(address_buf, 0, 14, address);
66
67 retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE);
68 if (retval != ERROR_OK)
69 return retval;
70 retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_IDLE);
71 if (retval != ERROR_OK)
72 return retval;
73
74 fields[0].num_bits = 32;
75 fields[0].out_value = NULL;
76 fields[0].in_value = (uint8_t *)value;
77
78 fields[1].num_bits = 1;
79 fields[1].out_value = &access_t;
80 fields[1].in_value = &access_t;
81
82 fields[2].num_bits = 14;
83 fields[2].out_value = address_buf;
84 fields[2].in_value = NULL;
85
86 fields[3].num_bits = 1;
87 fields[3].out_value = &nr_w_buf;
88 fields[3].in_value = NULL;
89
90 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
91
92 long long then = timeval_ms();
93
94 for (;;) {
95 /* rescan with NOP, to wait for the access to complete */
96 access_t = 0;
97 nr_w_buf = 0;
98 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
99
100 jtag_add_callback(arm_le_to_h_u32, (jtag_callback_data_t)value);
101
102 retval = jtag_execute_queue();
103 if (retval != ERROR_OK)
104 return retval;
105
106 if (buf_get_u32(&access_t, 0, 1) == 1)
107 break;
108
109 /* 10ms timeout */
110 if ((timeval_ms()-then) > 10) {
111 LOG_ERROR("cp15 read operation timed out");
112 return ERROR_FAIL;
113 }
114 }
115
116 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
117 LOG_DEBUG("addr: 0x%x value: %8.8x", address, *value);
118 #endif
119
120 retval = arm_jtag_set_instr(jtag_info, 0xc, NULL, TAP_IDLE);
121 if (retval != ERROR_OK)
122 return retval;
123
124 return ERROR_OK;
125 }
126
127 static int arm926ejs_mrc(struct target *target, int cpnum, uint32_t op1,
128 uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t *value)
129 {
130 if (cpnum != 15) {
131 LOG_ERROR("Only cp15 is supported");
132 return ERROR_FAIL;
133 }
134 return arm926ejs_cp15_read(target, op1, op2, CRn, CRm, value);
135 }
136
137 static int arm926ejs_cp15_write(struct target *target, uint32_t op1, uint32_t op2,
138 uint32_t CRn, uint32_t CRm, uint32_t value)
139 {
140 int retval = ERROR_OK;
141 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
142 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
143 uint32_t address = ARM926EJS_CP15_ADDR(op1, op2, CRn, CRm);
144 struct scan_field fields[4];
145 uint8_t value_buf[4];
146 uint8_t address_buf[2] = {0, 0};
147 uint8_t nr_w_buf = 1;
148 uint8_t access_t = 1;
149
150 buf_set_u32(address_buf, 0, 14, address);
151 buf_set_u32(value_buf, 0, 32, value);
152
153 retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE);
154 if (retval != ERROR_OK)
155 return retval;
156 retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_IDLE);
157 if (retval != ERROR_OK)
158 return retval;
159
160 fields[0].num_bits = 32;
161 fields[0].out_value = value_buf;
162 fields[0].in_value = NULL;
163
164 fields[1].num_bits = 1;
165 fields[1].out_value = &access_t;
166 fields[1].in_value = &access_t;
167
168 fields[2].num_bits = 14;
169 fields[2].out_value = address_buf;
170 fields[2].in_value = NULL;
171
172 fields[3].num_bits = 1;
173 fields[3].out_value = &nr_w_buf;
174 fields[3].in_value = NULL;
175
176 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
177
178 long long then = timeval_ms();
179
180 for (;;) {
181 /* rescan with NOP, to wait for the access to complete */
182 access_t = 0;
183 nr_w_buf = 0;
184 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
185 retval = jtag_execute_queue();
186 if (retval != ERROR_OK)
187 return retval;
188
189 if (buf_get_u32(&access_t, 0, 1) == 1)
190 break;
191
192 /* 10ms timeout */
193 if ((timeval_ms()-then) > 10) {
194 LOG_ERROR("cp15 write operation timed out");
195 return ERROR_FAIL;
196 }
197 }
198
199 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
200 LOG_DEBUG("addr: 0x%x value: %8.8x", address, value);
201 #endif
202
203 retval = arm_jtag_set_instr(jtag_info, 0xf, NULL, TAP_IDLE);
204 if (retval != ERROR_OK)
205 return retval;
206
207 return ERROR_OK;
208 }
209
210 static int arm926ejs_mcr(struct target *target, int cpnum, uint32_t op1,
211 uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t value)
212 {
213 if (cpnum != 15) {
214 LOG_ERROR("Only cp15 is supported");
215 return ERROR_FAIL;
216 }
217 return arm926ejs_cp15_write(target, op1, op2, CRn, CRm, value);
218 }
219
220 static int arm926ejs_examine_debug_reason(struct target *target)
221 {
222 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
223 struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
224 int debug_reason;
225 int retval;
226
227 embeddedice_read_reg(dbg_stat);
228 retval = jtag_execute_queue();
229 if (retval != ERROR_OK)
230 return retval;
231
232 /* Method-Of-Entry (MOE) field */
233 debug_reason = buf_get_u32(dbg_stat->value, 6, 4);
234
235 switch (debug_reason) {
236 case 0:
237 LOG_DEBUG("no *NEW* debug entry (?missed one?)");
238 /* ... since last restart or debug reset ... */
239 target->debug_reason = DBG_REASON_DBGRQ;
240 break;
241 case 1:
242 LOG_DEBUG("breakpoint from EICE unit 0");
243 target->debug_reason = DBG_REASON_BREAKPOINT;
244 break;
245 case 2:
246 LOG_DEBUG("breakpoint from EICE unit 1");
247 target->debug_reason = DBG_REASON_BREAKPOINT;
248 break;
249 case 3:
250 LOG_DEBUG("soft breakpoint (BKPT instruction)");
251 target->debug_reason = DBG_REASON_BREAKPOINT;
252 break;
253 case 4:
254 LOG_DEBUG("vector catch breakpoint");
255 target->debug_reason = DBG_REASON_BREAKPOINT;
256 break;
257 case 5:
258 LOG_DEBUG("external breakpoint");
259 target->debug_reason = DBG_REASON_BREAKPOINT;
260 break;
261 case 6:
262 LOG_DEBUG("watchpoint from EICE unit 0");
263 target->debug_reason = DBG_REASON_WATCHPOINT;
264 break;
265 case 7:
266 LOG_DEBUG("watchpoint from EICE unit 1");
267 target->debug_reason = DBG_REASON_WATCHPOINT;
268 break;
269 case 8:
270 LOG_DEBUG("external watchpoint");
271 target->debug_reason = DBG_REASON_WATCHPOINT;
272 break;
273 case 9:
274 LOG_DEBUG("internal debug request");
275 target->debug_reason = DBG_REASON_DBGRQ;
276 break;
277 case 10:
278 LOG_DEBUG("external debug request");
279 target->debug_reason = DBG_REASON_DBGRQ;
280 break;
281 case 11:
282 LOG_DEBUG("debug re-entry from system speed access");
283 /* This is normal when connecting to something that's
284 * already halted, or in some related code paths, but
285 * otherwise is surprising (and presumably wrong).
286 */
287 switch (target->debug_reason) {
288 case DBG_REASON_DBGRQ:
289 break;
290 default:
291 LOG_ERROR("unexpected -- debug re-entry");
292 /* FALLTHROUGH */
293 case DBG_REASON_UNDEFINED:
294 target->debug_reason = DBG_REASON_DBGRQ;
295 break;
296 }
297 break;
298 case 12:
299 /* FIX!!!! here be dragons!!! We need to fail here so
300 * the target will interpreted as halted but we won't
301 * try to talk to it right now... a resume + halt seems
302 * to sync things up again. Please send an email to
303 * openocd development mailing list if you have hardware
304 * to donate to look into this problem....
305 */
306 LOG_WARNING("WARNING: mystery debug reason MOE = 0xc. Try issuing a resume + halt.");
307 target->debug_reason = DBG_REASON_DBGRQ;
308 break;
309 default:
310 LOG_WARNING("WARNING: unknown debug reason: 0x%x", debug_reason);
311 /* Oh agony! should we interpret this as a halt request or
312 * that the target stopped on it's own accord?
313 */
314 target->debug_reason = DBG_REASON_DBGRQ;
315 /* if we fail here, we won't talk to the target and it will
316 * be reported to be in the halted state */
317 break;
318 }
319
320 return ERROR_OK;
321 }
322
323 static int arm926ejs_get_ttb(struct target *target, uint32_t *result)
324 {
325 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
326 int retval;
327 uint32_t ttb = 0x0;
328
329 retval = arm926ejs->read_cp15(target, 0, 0, 2, 0, &ttb);
330 if (retval != ERROR_OK)
331 return retval;
332
333 *result = ttb;
334
335 return ERROR_OK;
336 }
337
338 static int arm926ejs_disable_mmu_caches(struct target *target, int mmu,
339 int d_u_cache, int i_cache)
340 {
341 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
342 uint32_t cp15_control;
343 int retval;
344
345 /* read cp15 control register */
346 retval = arm926ejs->read_cp15(target, 0, 0, 1, 0, &cp15_control);
347 if (retval != ERROR_OK)
348 return retval;
349 retval = jtag_execute_queue();
350 if (retval != ERROR_OK)
351 return retval;
352
353 if (mmu) {
354 /* invalidate TLB */
355 retval = arm926ejs->write_cp15(target, 0, 0, 8, 7, 0x0);
356 if (retval != ERROR_OK)
357 return retval;
358
359 cp15_control &= ~0x1U;
360 }
361
362 if (d_u_cache) {
363 uint32_t debug_override;
364 /* read-modify-write CP15 debug override register
365 * to enable "test and clean all" */
366 retval = arm926ejs->read_cp15(target, 0, 0, 15, 0, &debug_override);
367 if (retval != ERROR_OK)
368 return retval;
369 debug_override |= 0x80000;
370 retval = arm926ejs->write_cp15(target, 0, 0, 15, 0, debug_override);
371 if (retval != ERROR_OK)
372 return retval;
373
374 /* clean and invalidate DCache */
375 retval = arm926ejs->write_cp15(target, 0, 0, 7, 5, 0x0);
376 if (retval != ERROR_OK)
377 return retval;
378
379 /* write CP15 debug override register
380 * to disable "test and clean all" */
381 debug_override &= ~0x80000;
382 retval = arm926ejs->write_cp15(target, 0, 0, 15, 0, debug_override);
383 if (retval != ERROR_OK)
384 return retval;
385
386 cp15_control &= ~0x4U;
387 }
388
389 if (i_cache) {
390 /* invalidate ICache */
391 retval = arm926ejs->write_cp15(target, 0, 0, 7, 5, 0x0);
392 if (retval != ERROR_OK)
393 return retval;
394
395 cp15_control &= ~0x1000U;
396 }
397
398 retval = arm926ejs->write_cp15(target, 0, 0, 1, 0, cp15_control);
399 return retval;
400 }
401
402 static int arm926ejs_enable_mmu_caches(struct target *target, int mmu,
403 int d_u_cache, int i_cache)
404 {
405 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
406 uint32_t cp15_control;
407 int retval;
408
409 /* read cp15 control register */
410 retval = arm926ejs->read_cp15(target, 0, 0, 1, 0, &cp15_control);
411 if (retval != ERROR_OK)
412 return retval;
413 retval = jtag_execute_queue();
414 if (retval != ERROR_OK)
415 return retval;
416
417 if (mmu)
418 cp15_control |= 0x1U;
419
420 if (d_u_cache)
421 cp15_control |= 0x4U;
422
423 if (i_cache)
424 cp15_control |= 0x1000U;
425
426 retval = arm926ejs->write_cp15(target, 0, 0, 1, 0, cp15_control);
427 return retval;
428 }
429
430 static int arm926ejs_post_debug_entry(struct target *target)
431 {
432 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
433 int retval;
434
435 /* examine cp15 control reg */
436 retval = arm926ejs->read_cp15(target, 0, 0, 1, 0, &arm926ejs->cp15_control_reg);
437 if (retval != ERROR_OK)
438 return retval;
439 retval = jtag_execute_queue();
440 if (retval != ERROR_OK)
441 return retval;
442 LOG_DEBUG("cp15_control_reg: %8.8" PRIx32 "", arm926ejs->cp15_control_reg);
443
444 if (arm926ejs->armv4_5_mmu.armv4_5_cache.ctype == -1) {
445 uint32_t cache_type_reg;
446 /* identify caches */
447 retval = arm926ejs->read_cp15(target, 0, 1, 0, 0, &cache_type_reg);
448 if (retval != ERROR_OK)
449 return retval;
450 retval = jtag_execute_queue();
451 if (retval != ERROR_OK)
452 return retval;
453 armv4_5_identify_cache(cache_type_reg, &arm926ejs->armv4_5_mmu.armv4_5_cache);
454 }
455
456 arm926ejs->armv4_5_mmu.mmu_enabled = (arm926ejs->cp15_control_reg & 0x1U) ? 1 : 0;
457 arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = (arm926ejs->cp15_control_reg & 0x4U) ? 1 : 0;
458 arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = (arm926ejs->cp15_control_reg & 0x1000U) ? 1 : 0;
459
460 /* save i/d fault status and address register */
461 retval = arm926ejs->read_cp15(target, 0, 0, 5, 0, &arm926ejs->d_fsr);
462 if (retval != ERROR_OK)
463 return retval;
464 retval = arm926ejs->read_cp15(target, 0, 1, 5, 0, &arm926ejs->i_fsr);
465 if (retval != ERROR_OK)
466 return retval;
467 retval = arm926ejs->read_cp15(target, 0, 0, 6, 0, &arm926ejs->d_far);
468 if (retval != ERROR_OK)
469 return retval;
470
471 LOG_DEBUG("D FSR: 0x%8.8" PRIx32 ", D FAR: 0x%8.8" PRIx32 ", I FSR: 0x%8.8" PRIx32 "",
472 arm926ejs->d_fsr, arm926ejs->d_far, arm926ejs->i_fsr);
473
474 uint32_t cache_dbg_ctrl;
475
476 /* read-modify-write CP15 cache debug control register
477 * to disable I/D-cache linefills and force WT */
478 retval = arm926ejs->read_cp15(target, 7, 0, 15, 0, &cache_dbg_ctrl);
479 if (retval != ERROR_OK)
480 return retval;
481 cache_dbg_ctrl |= 0x7;
482 retval = arm926ejs->write_cp15(target, 7, 0, 15, 0, cache_dbg_ctrl);
483 return retval;
484 }
485
486 static void arm926ejs_pre_restore_context(struct target *target)
487 {
488 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
489
490 /* restore i/d fault status and address register */
491 arm926ejs->write_cp15(target, 0, 0, 5, 0, arm926ejs->d_fsr);
492 arm926ejs->write_cp15(target, 0, 1, 5, 0, arm926ejs->i_fsr);
493 arm926ejs->write_cp15(target, 0, 0, 6, 0, arm926ejs->d_far);
494
495 uint32_t cache_dbg_ctrl;
496
497 /* read-modify-write CP15 cache debug control register
498 * to reenable I/D-cache linefills and disable WT */
499 arm926ejs->read_cp15(target, 7, 0, 15, 0, &cache_dbg_ctrl);
500 cache_dbg_ctrl &= ~0x7;
501 arm926ejs->write_cp15(target, 7, 0, 15, 0, cache_dbg_ctrl);
502 }
503
504 static const char arm926_not[] = "target is not an ARM926";
505
506 static int arm926ejs_verify_pointer(struct command_context *cmd_ctx,
507 struct arm926ejs_common *arm926)
508 {
509 if (arm926->common_magic != ARM926EJS_COMMON_MAGIC) {
510 command_print(cmd_ctx, arm926_not);
511 return ERROR_TARGET_INVALID;
512 }
513 return ERROR_OK;
514 }
515
516 /** Logs summary of ARM926 state for a halted target. */
517 int arm926ejs_arch_state(struct target *target)
518 {
519 static const char *state[] = {
520 "disabled", "enabled"
521 };
522
523 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
524
525 if (arm926ejs->common_magic != ARM926EJS_COMMON_MAGIC) {
526 LOG_ERROR("BUG: %s", arm926_not);
527 return ERROR_TARGET_INVALID;
528 }
529
530 arm_arch_state(target);
531 LOG_USER("MMU: %s, D-Cache: %s, I-Cache: %s",
532 state[arm926ejs->armv4_5_mmu.mmu_enabled],
533 state[arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled],
534 state[arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled]);
535
536 return ERROR_OK;
537 }
538
539 int arm926ejs_soft_reset_halt(struct target *target)
540 {
541 int retval = ERROR_OK;
542 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
543 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
544 struct arm *arm = &arm7_9->arm;
545 struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
546
547 retval = target_halt(target);
548 if (retval != ERROR_OK)
549 return retval;
550
551 long long then = timeval_ms();
552 int timeout;
553 while (!(timeout = ((timeval_ms()-then) > 1000))) {
554 if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1) == 0) {
555 embeddedice_read_reg(dbg_stat);
556 retval = jtag_execute_queue();
557 if (retval != ERROR_OK)
558 return retval;
559 } else
560 break;
561 if (debug_level >= 1) {
562 /* do not eat all CPU, time out after 1 se*/
563 alive_sleep(100);
564 } else
565 keep_alive();
566 }
567 if (timeout) {
568 LOG_ERROR("Failed to halt CPU after 1 sec");
569 return ERROR_TARGET_TIMEOUT;
570 }
571
572 target->state = TARGET_HALTED;
573
574 /* SVC, ARM state, IRQ and FIQ disabled */
575 uint32_t cpsr;
576
577 cpsr = buf_get_u32(arm->cpsr->value, 0, 32);
578 cpsr &= ~0xff;
579 cpsr |= 0xd3;
580 arm_set_cpsr(arm, cpsr);
581 arm->cpsr->dirty = 1;
582
583 /* start fetching from 0x0 */
584 buf_set_u32(arm->pc->value, 0, 32, 0x0);
585 arm->pc->dirty = 1;
586 arm->pc->valid = 1;
587
588 retval = arm926ejs_disable_mmu_caches(target, 1, 1, 1);
589 if (retval != ERROR_OK)
590 return retval;
591 arm926ejs->armv4_5_mmu.mmu_enabled = 0;
592 arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = 0;
593 arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = 0;
594
595 return target_call_event_callbacks(target, TARGET_EVENT_HALTED);
596 }
597
598 /** Writes a buffer, in the specified word size, with current MMU settings. */
599 int arm926ejs_write_memory(struct target *target, uint32_t address,
600 uint32_t size, uint32_t count, const uint8_t *buffer)
601 {
602 int retval;
603 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
604
605 /* FIX!!!! this should be cleaned up and made much more general. The
606 * plan is to write up and test on arm926ejs specifically and
607 * then generalize and clean up afterwards.
608 *
609 *
610 * Also it should be moved to the callbacks that handle breakpoints
611 * specifically and not the generic memory write fn's. See XScale code.
612 **/
613 if (arm926ejs->armv4_5_mmu.mmu_enabled && (count == 1) && ((size == 2) || (size == 4))) {
614 /* special case the handling of single word writes to bypass MMU
615 * to allow implementation of breakpoints in memory marked read only
616 * by MMU */
617 if (arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled) {
618 /* flush and invalidate data cache
619 *
620 * MCR p15,0,p,c7,c10,1 - clean cache line using virtual address
621 *
622 */
623 retval = arm926ejs->write_cp15(target, 0, 1, 7, 10, address&~0x3);
624 if (retval != ERROR_OK)
625 return retval;
626 }
627
628 uint32_t pa;
629 retval = target->type->virt2phys(target, address, &pa);
630 if (retval != ERROR_OK)
631 return retval;
632
633 /* write directly to physical memory bypassing any read only MMU bits, etc. */
634 retval = armv4_5_mmu_write_physical(target, &arm926ejs->armv4_5_mmu, pa, size, count, buffer);
635 if (retval != ERROR_OK)
636 return retval;
637 } else {
638 retval = arm7_9_write_memory(target, address, size, count, buffer);
639 if (retval != ERROR_OK)
640 return retval;
641 }
642
643 /* If ICache is enabled, we have to invalidate affected ICache lines
644 * the DCache is forced to write-through, so we don't have to clean it here
645 */
646 if (arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled) {
647 if (count <= 1) {
648 /* invalidate ICache single entry with MVA */
649 arm926ejs->write_cp15(target, 0, 1, 7, 5, address);
650 } else {
651 /* invalidate ICache */
652 arm926ejs->write_cp15(target, 0, 0, 7, 5, address);
653 }
654 }
655
656 return retval;
657 }
658
659 static int arm926ejs_write_phys_memory(struct target *target,
660 uint32_t address, uint32_t size,
661 uint32_t count, const uint8_t *buffer)
662 {
663 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
664
665 return armv4_5_mmu_write_physical(target, &arm926ejs->armv4_5_mmu,
666 address, size, count, buffer);
667 }
668
669 static int arm926ejs_read_phys_memory(struct target *target,
670 uint32_t address, uint32_t size,
671 uint32_t count, uint8_t *buffer)
672 {
673 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
674
675 return armv4_5_mmu_read_physical(target, &arm926ejs->armv4_5_mmu,
676 address, size, count, buffer);
677 }
678
679 int arm926ejs_init_arch_info(struct target *target, struct arm926ejs_common *arm926ejs,
680 struct jtag_tap *tap)
681 {
682 struct arm7_9_common *arm7_9 = &arm926ejs->arm7_9_common;
683
684 arm7_9->arm.mrc = arm926ejs_mrc;
685 arm7_9->arm.mcr = arm926ejs_mcr;
686
687 /* initialize arm7/arm9 specific info (including armv4_5) */
688 arm9tdmi_init_arch_info(target, arm7_9, tap);
689
690 arm926ejs->common_magic = ARM926EJS_COMMON_MAGIC;
691
692 arm7_9->post_debug_entry = arm926ejs_post_debug_entry;
693 arm7_9->pre_restore_context = arm926ejs_pre_restore_context;
694
695 arm926ejs->read_cp15 = arm926ejs_cp15_read;
696 arm926ejs->write_cp15 = arm926ejs_cp15_write;
697 arm926ejs->armv4_5_mmu.armv4_5_cache.ctype = -1;
698 arm926ejs->armv4_5_mmu.get_ttb = arm926ejs_get_ttb;
699 arm926ejs->armv4_5_mmu.read_memory = arm7_9_read_memory;
700 arm926ejs->armv4_5_mmu.write_memory = arm7_9_write_memory;
701 arm926ejs->armv4_5_mmu.disable_mmu_caches = arm926ejs_disable_mmu_caches;
702 arm926ejs->armv4_5_mmu.enable_mmu_caches = arm926ejs_enable_mmu_caches;
703 arm926ejs->armv4_5_mmu.has_tiny_pages = 1;
704 arm926ejs->armv4_5_mmu.mmu_enabled = 0;
705
706 arm7_9->examine_debug_reason = arm926ejs_examine_debug_reason;
707
708 /* The ARM926EJ-S implements the ARMv5TE architecture which
709 * has the BKPT instruction, so we don't have to use a watchpoint comparator
710 */
711 arm7_9->arm_bkpt = ARMV5_BKPT(0x0);
712 arm7_9->thumb_bkpt = ARMV5_T_BKPT(0x0) & 0xffff;
713
714 return ERROR_OK;
715 }
716
717 static int arm926ejs_target_create(struct target *target, Jim_Interp *interp)
718 {
719 struct arm926ejs_common *arm926ejs = calloc(1, sizeof(struct arm926ejs_common));
720
721 /* ARM9EJ-S core always reports 0x1 in Capture-IR */
722 target->tap->ir_capture_mask = 0x0f;
723
724 return arm926ejs_init_arch_info(target, arm926ejs, target->tap);
725 }
726
727 COMMAND_HANDLER(arm926ejs_handle_cache_info_command)
728 {
729 int retval;
730 struct target *target = get_current_target(CMD_CTX);
731 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
732
733 retval = arm926ejs_verify_pointer(CMD_CTX, arm926ejs);
734 if (retval != ERROR_OK)
735 return retval;
736
737 return armv4_5_handle_cache_info_command(CMD_CTX, &arm926ejs->armv4_5_mmu.armv4_5_cache);
738 }
739
740 static int arm926ejs_virt2phys(struct target *target, uint32_t virtual, uint32_t *physical)
741 {
742 uint32_t cb;
743 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
744
745 uint32_t ret;
746 int retval = armv4_5_mmu_translate_va(target, &arm926ejs->armv4_5_mmu,
747 virtual, &cb, &ret);
748 if (retval != ERROR_OK)
749 return retval;
750 *physical = ret;
751 return ERROR_OK;
752 }
753
754 static int arm926ejs_mmu(struct target *target, int *enabled)
755 {
756 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
757
758 if (target->state != TARGET_HALTED) {
759 LOG_ERROR("Target not halted");
760 return ERROR_TARGET_INVALID;
761 }
762 *enabled = arm926ejs->armv4_5_mmu.mmu_enabled;
763 return ERROR_OK;
764 }
765
766 static const struct command_registration arm926ejs_exec_command_handlers[] = {
767 {
768 .name = "cache_info",
769 .handler = arm926ejs_handle_cache_info_command,
770 .mode = COMMAND_EXEC,
771 .usage = "",
772 .help = "display information about target caches",
773
774 },
775 COMMAND_REGISTRATION_DONE
776 };
777 const struct command_registration arm926ejs_command_handlers[] = {
778 {
779 .chain = arm9tdmi_command_handlers,
780 },
781 {
782 .name = "arm926ejs",
783 .mode = COMMAND_ANY,
784 .help = "arm926ejs command group",
785 .usage = "",
786 .chain = arm926ejs_exec_command_handlers,
787 },
788 COMMAND_REGISTRATION_DONE
789 };
790
791 /** Holds methods for ARM926 targets. */
792 struct target_type arm926ejs_target = {
793 .name = "arm926ejs",
794
795 .poll = arm7_9_poll,
796 .arch_state = arm926ejs_arch_state,
797
798 .target_request_data = arm7_9_target_request_data,
799
800 .halt = arm7_9_halt,
801 .resume = arm7_9_resume,
802 .step = arm7_9_step,
803
804 .assert_reset = arm7_9_assert_reset,
805 .deassert_reset = arm7_9_deassert_reset,
806 .soft_reset_halt = arm926ejs_soft_reset_halt,
807
808 .get_gdb_reg_list = arm_get_gdb_reg_list,
809
810 .read_memory = arm7_9_read_memory,
811 .write_memory = arm926ejs_write_memory,
812 .bulk_write_memory = arm7_9_bulk_write_memory,
813
814 .checksum_memory = arm_checksum_memory,
815 .blank_check_memory = arm_blank_check_memory,
816
817 .run_algorithm = armv4_5_run_algorithm,
818
819 .add_breakpoint = arm7_9_add_breakpoint,
820 .remove_breakpoint = arm7_9_remove_breakpoint,
821 .add_watchpoint = arm7_9_add_watchpoint,
822 .remove_watchpoint = arm7_9_remove_watchpoint,
823
824 .commands = arm926ejs_command_handlers,
825 .target_create = arm926ejs_target_create,
826 .init_target = arm9tdmi_init_target,
827 .examine = arm7_9_examine,
828 .check_reset = arm7_9_check_reset,
829 .virt2phys = arm926ejs_virt2phys,
830 .mmu = arm926ejs_mmu,
831
832 .read_phys_memory = arm926ejs_read_phys_memory,
833 .write_phys_memory = arm926ejs_write_phys_memory,
834 };
Spen's Unofficial Testing Repository