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jtag: basic support for P&E Micro OSBDM (aka OSJTAG) adapter
[openocd.git] / src / target / mips32_pracc.c
blob267a4ffd94c89c24a263ffe17854263daf44a4e4
1 /***************************************************************************
2 * Copyright (C) 2008 by Spencer Oliver *
3 * spen@spen-soft.co.uk *
4 * *
5 * Copyright (C) 2008 by David T.L. Wong *
6 * *
7 * Copyright (C) 2009 by David N. Claffey <dnclaffey@gmail.com> *
8 * *
9 * Copyright (C) 2011 by Drasko DRASKOVIC *
10 * drasko.draskovic@gmail.com *
11 * *
12 * This program is free software; you can redistribute it and/or modify *
13 * it under the terms of the GNU General Public License as published by *
14 * the Free Software Foundation; either version 2 of the License, or *
15 * (at your option) any later version. *
16 * *
17 * This program is distributed in the hope that it will be useful, *
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
20 * GNU General Public License for more details. *
21 * *
22 * You should have received a copy of the GNU General Public License *
23 * along with this program; if not, write to the *
24 * Free Software Foundation, Inc., *
25 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
26 ***************************************************************************/
27
28 /*
29 * This version has optimized assembly routines for 32 bit operations:
30 * - read word
31 * - write word
32 * - write array of words
33 *
34 * One thing to be aware of is that the MIPS32 cpu will execute the
35 * instruction after a branch instruction (one delay slot).
36 *
37 * For example:
38 * LW $2, ($5 +10)
39 * B foo
40 * LW $1, ($2 +100)
41 *
42 * The LW $1, ($2 +100) instruction is also executed. If this is
43 * not wanted a NOP can be inserted:
44 *
45 * LW $2, ($5 +10)
46 * B foo
47 * NOP
48 * LW $1, ($2 +100)
49 *
50 * or the code can be changed to:
51 *
52 * B foo
53 * LW $2, ($5 +10)
54 * LW $1, ($2 +100)
55 *
56 * The original code contained NOPs. I have removed these and moved
57 * the branches.
58 *
59 * I also moved the PRACC_STACK to 0xFF204000. This allows
60 * the use of 16 bits offsets to get pointers to the input
61 * and output area relative to the stack. Note that the stack
62 * isn't really a stack (the stack pointer is not 'moving')
63 * but a FIFO simulated in software.
64 *
65 * These changes result in a 35% speed increase when programming an
66 * external flash.
67 *
68 * More improvement could be gained if the registers do no need
69 * to be preserved but in that case the routines should be aware
70 * OpenOCD is used as a flash programmer or as a debug tool.
71 *
72 * Nico Coesel
73 */
74
75 #ifdef HAVE_CONFIG_H
76 #include "config.h"
77 #endif
78
79 #include <helper/time_support.h>
80
81 #include "mips32.h"
82 #include "mips32_pracc.h"
83
84 struct mips32_pracc_context {
85 uint32_t *local_iparam;
86 int num_iparam;
87 uint32_t *local_oparam;
88 int num_oparam;
89 const uint32_t *code;
90 int code_len;
91 uint32_t stack[32];
92 int stack_offset;
93 struct mips_ejtag *ejtag_info;
94 };
95
96 static int mips32_pracc_read_mem8(struct mips_ejtag *ejtag_info,
97 uint32_t addr, int count, uint8_t *buf);
98 static int mips32_pracc_read_mem16(struct mips_ejtag *ejtag_info,
99 uint32_t addr, int count, uint16_t *buf);
100 static int mips32_pracc_read_mem32(struct mips_ejtag *ejtag_info,
101 uint32_t addr, int count, uint32_t *buf);
102 static int mips32_pracc_read_u32(struct mips_ejtag *ejtag_info,
103 uint32_t addr, uint32_t *buf);
104
105 static int mips32_pracc_write_mem8(struct mips_ejtag *ejtag_info,
106 uint32_t addr, int count, uint8_t *buf);
107 static int mips32_pracc_write_mem16(struct mips_ejtag *ejtag_info,
108 uint32_t addr, int count, uint16_t *buf);
109 static int mips32_pracc_write_mem32(struct mips_ejtag *ejtag_info,
110 uint32_t addr, int count, uint32_t *buf);
111 static int mips32_pracc_write_u32(struct mips_ejtag *ejtag_info,
112 uint32_t addr, uint32_t *buf);
113
114 static int mips32_pracc_sync_cache(struct mips_ejtag *ejtag_info,
115 uint32_t start_addr, uint32_t end_addr);
116 static int mips32_pracc_clean_invalidate_cache(struct mips_ejtag *ejtag_info,
117 uint32_t start_addr, uint32_t end_addr);
118
119 static int wait_for_pracc_rw(struct mips_ejtag *ejtag_info, uint32_t *ctrl)
120 {
121 uint32_t ejtag_ctrl;
122 long long then = timeval_ms();
123 int timeout;
124 int retval;
125
126 /* wait for the PrAcc to become "1" */
127 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
128 ejtag_ctrl = ejtag_info->ejtag_ctrl;
129
130 while (1) {
131 retval = mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
132 if (retval != ERROR_OK)
133 return retval;
134
135 if (ejtag_ctrl & EJTAG_CTRL_PRACC)
136 break;
137
138 timeout = timeval_ms() - then;
139 if (timeout > 1000) {
140 LOG_DEBUG("DEBUGMODULE: No memory access in progress!");
141 return ERROR_JTAG_DEVICE_ERROR;
142 }
143 }
144
145 *ctrl = ejtag_ctrl;
146 return ERROR_OK;
147 }
148
149 static int mips32_pracc_exec_read(struct mips32_pracc_context *ctx, uint32_t address)
150 {
151 struct mips_ejtag *ejtag_info = ctx->ejtag_info;
152 int offset;
153 uint32_t ejtag_ctrl, data;
154
155 if ((address >= MIPS32_PRACC_PARAM_IN)
156 && (address <= MIPS32_PRACC_PARAM_IN + ctx->num_iparam * 4)) {
157 offset = (address - MIPS32_PRACC_PARAM_IN) / 4;
158 data = ctx->local_iparam[offset];
159 } else if ((address >= MIPS32_PRACC_PARAM_OUT)
160 && (address <= MIPS32_PRACC_PARAM_OUT + ctx->num_oparam * 4)) {
161 offset = (address - MIPS32_PRACC_PARAM_OUT) / 4;
162 data = ctx->local_oparam[offset];
163 } else if ((address >= MIPS32_PRACC_TEXT)
164 && (address <= MIPS32_PRACC_TEXT + ctx->code_len * 4)) {
165 offset = (address - MIPS32_PRACC_TEXT) / 4;
166 data = ctx->code[offset];
167 } else if (address == MIPS32_PRACC_STACK) {
168 /* save to our debug stack */
169 data = ctx->stack[--ctx->stack_offset];
170 } else {
171 /* TODO: send JMP 0xFF200000 instruction. Hopefully processor jump back
172 * to start of debug vector */
173
174 LOG_ERROR("Error reading unexpected address 0x%8.8" PRIx32 "", address);
175 return ERROR_JTAG_DEVICE_ERROR;
176 }
177
178 /* Send the data out */
179 mips_ejtag_set_instr(ctx->ejtag_info, EJTAG_INST_DATA);
180 mips_ejtag_drscan_32_out(ctx->ejtag_info, data);
181
182 /* Clear the access pending bit (let the processor eat!) */
183 ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_PRACC;
184 mips_ejtag_set_instr(ctx->ejtag_info, EJTAG_INST_CONTROL);
185 mips_ejtag_drscan_32_out(ctx->ejtag_info, ejtag_ctrl);
186
187 return jtag_execute_queue();
188 }
189
190 static int mips32_pracc_exec_write(struct mips32_pracc_context *ctx, uint32_t address)
191 {
192 uint32_t ejtag_ctrl, data;
193 int offset;
194 struct mips_ejtag *ejtag_info = ctx->ejtag_info;
195 int retval;
196
197 mips_ejtag_set_instr(ctx->ejtag_info, EJTAG_INST_DATA);
198 retval = mips_ejtag_drscan_32(ctx->ejtag_info, &data);
199 if (retval != ERROR_OK)
200 return retval;
201
202 /* Clear access pending bit */
203 ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_PRACC;
204 mips_ejtag_set_instr(ctx->ejtag_info, EJTAG_INST_CONTROL);
205 mips_ejtag_drscan_32_out(ctx->ejtag_info, ejtag_ctrl);
206
207 retval = jtag_execute_queue();
208 if (retval != ERROR_OK)
209 return retval;
210
211 if ((address >= MIPS32_PRACC_PARAM_IN)
212 && (address <= MIPS32_PRACC_PARAM_IN + ctx->num_iparam * 4)) {
213 offset = (address - MIPS32_PRACC_PARAM_IN) / 4;
214 ctx->local_iparam[offset] = data;
215 } else if ((address >= MIPS32_PRACC_PARAM_OUT)
216 && (address <= MIPS32_PRACC_PARAM_OUT + ctx->num_oparam * 4)) {
217 offset = (address - MIPS32_PRACC_PARAM_OUT) / 4;
218 ctx->local_oparam[offset] = data;
219 } else if (address == MIPS32_PRACC_STACK) {
220 /* save data onto our stack */
221 ctx->stack[ctx->stack_offset++] = data;
222 } else {
223 LOG_ERROR("Error writing unexpected address 0x%8.8" PRIx32 "", address);
224 return ERROR_JTAG_DEVICE_ERROR;
225 }
226
227 return ERROR_OK;
228 }
229
230 int mips32_pracc_exec(struct mips_ejtag *ejtag_info, int code_len, const uint32_t *code,
231 int num_param_in, uint32_t *param_in, int num_param_out, uint32_t *param_out, int cycle)
232 {
233 uint32_t ejtag_ctrl;
234 uint32_t address, data;
235 struct mips32_pracc_context ctx;
236 int retval;
237 int pass = 0;
238
239 ctx.local_iparam = param_in;
240 ctx.local_oparam = param_out;
241 ctx.num_iparam = num_param_in;
242 ctx.num_oparam = num_param_out;
243 ctx.code = code;
244 ctx.code_len = code_len;
245 ctx.ejtag_info = ejtag_info;
246 ctx.stack_offset = 0;
247
248 while (1) {
249 retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl);
250 if (retval != ERROR_OK)
251 return retval;
252
253 address = data = 0;
254 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS);
255 retval = mips_ejtag_drscan_32(ejtag_info, &address);
256 if (retval != ERROR_OK)
257 return retval;
258
259 /* Check for read or write */
260 if (ejtag_ctrl & EJTAG_CTRL_PRNW) {
261 retval = mips32_pracc_exec_write(&ctx, address);
262 if (retval != ERROR_OK)
263 return retval;
264 } else {
265 /* Check to see if its reading at the debug vector. The first pass through
266 * the module is always read at the vector, so the first one we allow. When
267 * the second read from the vector occurs we are done and just exit. */
268 if ((address == MIPS32_PRACC_TEXT) && (pass++))
269 break;
270
271 retval = mips32_pracc_exec_read(&ctx, address);
272 if (retval != ERROR_OK)
273 return retval;
274 }
275
276 if (cycle == 0)
277 break;
278 }
279
280 /* stack sanity check */
281 if (ctx.stack_offset != 0)
282 LOG_DEBUG("Pracc Stack not zero");
283
284 return ERROR_OK;
285 }
286
287 int mips32_pracc_read_mem(struct mips_ejtag *ejtag_info, uint32_t addr, int size, int count, void *buf)
288 {
289 switch (size) {
290 case 1:
291 return mips32_pracc_read_mem8(ejtag_info, addr, count, (uint8_t *)buf);
292 case 2:
293 return mips32_pracc_read_mem16(ejtag_info, addr, count, (uint16_t *)buf);
294 case 4:
295 if (count == 1)
296 return mips32_pracc_read_u32(ejtag_info, addr, (uint32_t *)buf);
297 else
298 return mips32_pracc_read_mem32(ejtag_info, addr, count, (uint32_t *)buf);
299 }
300
301 return ERROR_OK;
302 }
303
304 static int mips32_pracc_read_mem32(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint32_t *buf)
305 {
306 static const uint32_t code[] = {
307 /* start: */
308 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
309 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
310 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
311 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
312 MIPS32_SW(9, 0, 15), /* sw $9,($15) */
313 MIPS32_SW(10, 0, 15), /* sw $10,($15) */
314 MIPS32_SW(11, 0, 15), /* sw $11,($15) */
315
316 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $8 = MIPS32_PRACC_PARAM_IN */
317 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
318 MIPS32_LW(9, 0, 8), /* $9 = mem[$8]; read addr */
319 MIPS32_LW(10, 4, 8), /* $10 = mem[$8 + 4]; read count */
320 MIPS32_LUI(11, UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $11 = MIPS32_PRACC_PARAM_OUT */
321 MIPS32_ORI(11, 11, LOWER16(MIPS32_PRACC_PARAM_OUT)),
322 /* loop: */
323 MIPS32_BEQ(0, 10, 8), /* beq 0, $10, end */
324 MIPS32_NOP,
325
326 MIPS32_LW(8, 0, 9), /* lw $8,0($9), Load $8 with the word @mem[$9] */
327 MIPS32_SW(8, 0, 11), /* sw $8,0($11) */
328
329 MIPS32_ADDI(10, 10, NEG16(1)), /* $10-- */
330 MIPS32_ADDI(9, 9, 4), /* $1 += 4 */
331 MIPS32_ADDI(11, 11, 4), /* $11 += 4 */
332
333 MIPS32_B(NEG16(8)), /* b loop */
334 MIPS32_NOP,
335 /* end: */
336 MIPS32_LW(11, 0, 15), /* lw $11,($15) */
337 MIPS32_LW(10, 0, 15), /* lw $10,($15) */
338 MIPS32_LW(9, 0, 15), /* lw $9,($15) */
339 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
340 MIPS32_B(NEG16(27)), /* b start */
341 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
342 };
343
344 int retval = ERROR_OK;
345 int blocksize;
346 int bytesread;
347 uint32_t param_in[2];
348
349 bytesread = 0;
350
351 while (count > 0) {
352 blocksize = count;
353 if (count > 0x400)
354 blocksize = 0x400;
355
356 param_in[0] = addr;
357 param_in[1] = blocksize;
358
359 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
360 ARRAY_SIZE(param_in), param_in, blocksize, &buf[bytesread], 1);
361 if (retval != ERROR_OK)
362 return retval;
363
364 count -= blocksize;
365 addr += blocksize;
366 bytesread += blocksize;
367 }
368
369 return retval;
370 }
371
372 static int mips32_pracc_read_u32(struct mips_ejtag *ejtag_info, uint32_t addr, uint32_t *buf)
373 {
374 static const uint32_t code[] = {
375 /* start: */
376 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
377 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
378 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
379 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
380
381 MIPS32_LW(8, NEG16(MIPS32_PRACC_STACK-MIPS32_PRACC_PARAM_IN), 15), /* load R8 @ param_in[0] = address */
382
383 MIPS32_LW(8, 0, 8), /* lw $8,0($8), Load $8 with the word @mem[$8] */
384 MIPS32_SW(8, NEG16(MIPS32_PRACC_STACK - MIPS32_PRACC_PARAM_OUT), 15), /* store R8 @ param_out[0] */
385
386 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
387 MIPS32_B(NEG16(9)), /* b start */
388 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
389 };
390
391 int retval = ERROR_OK;
392 uint32_t param_in[1];
393
394 param_in[0] = addr;
395
396 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
397 ARRAY_SIZE(param_in), param_in, 1, buf, 1);
398 if (retval != ERROR_OK)
399 return retval;
400
401 return retval;
402 }
403
404 static int mips32_pracc_read_mem16(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint16_t *buf)
405 {
406 static const uint32_t code[] = {
407 /* start: */
408 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
409 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
410 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
411 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
412 MIPS32_SW(9, 0, 15), /* sw $9,($15) */
413 MIPS32_SW(10, 0, 15), /* sw $10,($15) */
414 MIPS32_SW(11, 0, 15), /* sw $11,($15) */
415
416 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $8 = MIPS32_PRACC_PARAM_IN */
417 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
418 MIPS32_LW(9, 0, 8), /* $9 = mem[$8]; read addr */
419 MIPS32_LW(10, 4, 8), /* $10 = mem[$8 + 4]; read count */
420 MIPS32_LUI(11, UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $11 = MIPS32_PRACC_PARAM_OUT */
421 MIPS32_ORI(11, 11, LOWER16(MIPS32_PRACC_PARAM_OUT)),
422 /* loop: */
423 MIPS32_BEQ(0, 10, 8), /* beq 0, $10, end */
424 MIPS32_NOP,
425
426 MIPS32_LHU(8, 0, 9), /* lw $8,0($9), Load $8 with the halfword @mem[$9] */
427 MIPS32_SW(8, 0, 11), /* sw $8,0($11) */
428
429 MIPS32_ADDI(10, 10, NEG16(1)), /* $10-- */
430 MIPS32_ADDI(9, 9, 2), /* $9 += 2 */
431 MIPS32_ADDI(11, 11, 4), /* $11 += 4 */
432 MIPS32_B(NEG16(8)), /* b loop */
433 MIPS32_NOP,
434 /* end: */
435 MIPS32_LW(11, 0, 15), /* lw $11,($15) */
436 MIPS32_LW(10, 0, 15), /* lw $10,($15) */
437 MIPS32_LW(9, 0, 15), /* lw $9,($15) */
438 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
439 MIPS32_B(NEG16(27)), /* b start */
440 MIPS32_MFC0(15, 30, 0), /* move COP0 DeSave to $15 */
441 };
442
443 /* TODO remove array */
444 uint32_t *param_out = malloc(count * sizeof(uint32_t));
445 int i;
446
447 int retval = ERROR_OK;
448 int blocksize;
449 uint32_t param_in[2];
450
451 /*while (count > 0) */
452 {
453 blocksize = count;
454 if (count > 0x400)
455 blocksize = 0x400;
456
457 param_in[0] = addr;
458 param_in[1] = blocksize;
459
460 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
461 ARRAY_SIZE(param_in), param_in, count, param_out, 1);
462
463 /* count -= blocksize; */
464 /* addr += blocksize; */
465 }
466
467 for (i = 0; i < count; i++)
468 buf[i] = param_out[i];
469
470 free(param_out);
471
472 return retval;
473 }
474
475 static int mips32_pracc_read_mem8(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint8_t *buf)
476 {
477 static const uint32_t code[] = {
478 /* start: */
479 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
480 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
481 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
482 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
483 MIPS32_SW(9, 0, 15), /* sw $9,($15) */
484 MIPS32_SW(10, 0, 15), /* sw $10,($15) */
485 MIPS32_SW(11, 0, 15), /* sw $11,($15) */
486
487 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $8 = MIPS32_PRACC_PARAM_IN */
488 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
489 MIPS32_LW(9, 0, 8), /* $9 = mem[$8]; read addr */
490 MIPS32_LW(10, 4, 8), /* $10 = mem[$8 + 4]; read count */
491 MIPS32_LUI(11, UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $11 = MIPS32_PRACC_PARAM_OUT */
492 MIPS32_ORI(11, 11, LOWER16(MIPS32_PRACC_PARAM_OUT)),
493 /* loop: */
494 MIPS32_BEQ(0, 10, 8), /* beq 0, $10, end */
495 MIPS32_NOP,
496
497 MIPS32_LBU(8, 0, 9), /* lw $8,0($9), Load t4 with the byte @mem[t1] */
498 MIPS32_SW(8, 0, 11), /* sw $8,0($11) */
499
500 MIPS32_ADDI(10, 10, NEG16(1)), /* $10-- */
501 MIPS32_ADDI(9, 9, 1), /* $9 += 1 */
502 MIPS32_ADDI(11, 11, 4), /* $11 += 4 */
503 MIPS32_B(NEG16(8)), /* b loop */
504 MIPS32_NOP,
505 /* end: */
506 MIPS32_LW(11, 0, 15), /* lw $11,($15) */
507 MIPS32_LW(10, 0, 15), /* lw $10,($15) */
508 MIPS32_LW(9, 0, 15), /* lw $9,($15) */
509 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
510 MIPS32_B(NEG16(27)), /* b start */
511 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
512 };
513
514 /* TODO remove array */
515 uint32_t *param_out = malloc(count * sizeof(uint32_t));
516 int i;
517
518 int retval = ERROR_OK;
519 int blocksize;
520 uint32_t param_in[2];
521
522 /* while (count > 0) */
523 {
524 blocksize = count;
525 if (count > 0x400)
526 blocksize = 0x400;
527
528 param_in[0] = addr;
529 param_in[1] = blocksize;
530
531 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
532 ARRAY_SIZE(param_in), param_in, count, param_out, 1);
533
534 /* count -= blocksize; */
535 /* addr += blocksize; */
536 }
537
538 for (i = 0; i < count; i++)
539 buf[i] = param_out[i];
540
541 free(param_out);
542
543 return retval;
544 }
545
546 int mips32_cp0_read(struct mips_ejtag *ejtag_info, uint32_t *val, uint32_t cp0_reg, uint32_t cp0_sel)
547 {
548 /**
549 * Do not make this code static, but regenerate it every time,
550 * as 5th element has to be changed to add parameters
551 */
552 uint32_t code[] = {
553 /* start: */
554 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
555 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
556 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
557 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
558 MIPS32_SW(9, 0, 15), /* sw $9,($15) */
559
560 /* 5 */ MIPS32_MFC0(8, 0, 0), /* move COP0 [cp0_reg select] to $8 */
561
562 MIPS32_LUI(9, UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $11 = MIPS32_PRACC_PARAM_OUT */
563 MIPS32_ORI(9, 9, LOWER16(MIPS32_PRACC_PARAM_OUT)),
564 MIPS32_SW(8, 0, 9), /* sw $8,0($9) */
565
566 MIPS32_LW(9, 0, 15), /* lw $9,($15) */
567 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
568 MIPS32_B(NEG16(12)), /* b start */
569 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
570 };
571
572 /**
573 * Note that our input parametes cp0_reg and cp0_sel
574 * are numbers (not gprs) which make part of mfc0 instruction opcode.
575 *
576 * These are not fix, but can be different for each mips32_cp0_read() function call,
577 * and that is why we must insert them directly into opcode,
578 * i.e. we can not pass it on EJTAG microprogram stack (via param_in),
579 * and put them into the gprs later from MIPS32_PRACC_STACK
580 * because mfc0 do not use gpr as a parameter for the cp0_reg and select part,
581 * but plain (immediate) number.
582 *
583 * MIPS32_MTC0 is implemented via MIPS32_R_INST macro.
584 * In order to insert our parameters, we must change rd and funct fields.
585 */
586 code[5] |= (cp0_reg << 11) | cp0_sel; /* change rd and funct of MIPS32_R_INST macro */
587
588 /* TODO remove array */
589 uint32_t *param_out = val;
590 int retval;
591
592 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 0, NULL, 1, param_out, 1);
593
594 return retval;
595 }
596
597 int mips32_cp0_write(struct mips_ejtag *ejtag_info,
598 uint32_t val, uint32_t cp0_reg, uint32_t cp0_sel)
599 {
600 uint32_t code[] = {
601 /* start: */
602 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
603 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
604 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
605 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
606 MIPS32_SW(9, 0, 15), /* sw $9,($15) */
607
608 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $8 = MIPS32_PRACC_PARAM_IN */
609 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
610 MIPS32_LW(9, 0, 8), /* Load write val to $9 */
611
612 /* 8 */ MIPS32_MTC0(9, 0, 0), /* move $9 to COP0 [cp0_reg select] */
613
614 MIPS32_LW(9, 0, 15), /* lw $9,($15) */
615 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
616 MIPS32_B(NEG16(12)), /* b start */
617 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
618 };
619
620 /**
621 * Note that MIPS32_MTC0 macro is implemented via MIPS32_R_INST macro.
622 * In order to insert our parameters, we must change rd and funct fields.
623 */
624 code[8] |= (cp0_reg << 11) | cp0_sel; /* change rd and funct fields of MIPS32_R_INST macro */
625
626 /* TODO remove array */
627 uint32_t *param_in = malloc(1 * sizeof(uint32_t));
628 int retval;
629 param_in[0] = val;
630
631 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 1, param_in, 0, NULL, 1);
632
633 free(param_in);
634
635 return retval;
636 }
637
638 /**
639 * \b mips32_pracc_sync_cache
640 *
641 * Synchronize Caches to Make Instruction Writes Effective
642 * (ref. doc. MIPS32 Architecture For Programmers Volume II: The MIPS32 Instruction Set,
643 * Document Number: MD00086, Revision 2.00, June 9, 2003)
644 *
645 * When the instruction stream is written, the SYNCI instruction should be used
646 * in conjunction with other instructions to make the newly-written instructions effective.
647 *
648 * Explanation :
649 * A program that loads another program into memory is actually writing the D- side cache.
650 * The instructions it has loaded can't be executed until they reach the I-cache.
651 *
652 * After the instructions have been written, the loader should arrange
653 * to write back any containing D-cache line and invalidate any locations
654 * already in the I-cache.
655 *
656 * You can do that with cache instructions, but those instructions are only available in kernel mode,
657 * and a loader writing instructions for the use of its own process need not be privileged software.
658 *
659 * In the latest MIPS32/64 CPUs, MIPS provides the synci instruction,
660 * which does the whole job for a cache-line-sized chunk of the memory you just loaded:
661 * That is, it arranges a D-cache write-back and an I-cache invalidate.
662 *
663 * To employ synci at user level, you need to know the size of a cache line,
664 * and that can be obtained with a rdhwr SYNCI_Step
665 * from one of the standard “hardware registers”.
666 */
667 static int mips32_pracc_sync_cache(struct mips_ejtag *ejtag_info,
668 uint32_t start_addr, uint32_t end_addr)
669 {
670 static const uint32_t code[] = {
671 /* start: */
672 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
673 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
674 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
675 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
676 MIPS32_SW(9, 0, 15), /* sw $9,($15) */
677 MIPS32_SW(10, 0, 15), /* sw $10,($15) */
678 MIPS32_SW(11, 0, 15), /* sw $11,($15) */
679
680 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $8 = MIPS32_PRACC_PARAM_IN */
681 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
682 MIPS32_LW(9, 0, 8), /* Load write start_addr to $9 */
683 MIPS32_LW(10, 4, 8), /* Load write end_addr to $10 */
684
685 MIPS32_RDHWR(11, MIPS32_SYNCI_STEP), /* $11 = MIPS32_SYNCI_STEP */
686 MIPS32_BEQ(11, 0, 6), /* beq $11, $0, end */
687 MIPS32_NOP,
688 /* synci_loop : */
689 MIPS32_SYNCI(0, 9), /* synci 0($9) */
690 MIPS32_SLTU(8, 10, 9), /* sltu $8, $10, $9 # $8 = $10 < $9 ? 1 : 0 */
691 MIPS32_BNE(8, 0, NEG16(3)), /* bne $8, $0, synci_loop */
692 MIPS32_ADDU(9, 9, 11), /* $9 += MIPS32_SYNCI_STEP */
693 MIPS32_SYNC,
694 /* end: */
695 MIPS32_LW(11, 0, 15), /* lw $11,($15) */
696 MIPS32_LW(10, 0, 15), /* lw $10,($15) */
697 MIPS32_LW(9, 0, 15), /* lw $9,($15) */
698 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
699 MIPS32_B(NEG16(24)), /* b start */
700 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
701 };
702
703 /* TODO remove array */
704 uint32_t *param_in = malloc(2 * sizeof(uint32_t));
705 int retval;
706 param_in[0] = start_addr;
707 param_in[1] = end_addr;
708
709 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 2, param_in, 0, NULL, 1);
710
711 free(param_in);
712
713 return retval;
714 }
715
716 /**
717 * \b mips32_pracc_clean_invalidate_cache
718 *
719 * Writeback D$ and Invalidate I$
720 * so that the instructions written can be visible to CPU
721 */
722 static int mips32_pracc_clean_invalidate_cache(struct mips_ejtag *ejtag_info,
723 uint32_t start_addr, uint32_t end_addr)
724 {
725 static const uint32_t code[] = {
726 /* start: */
727 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
728 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
729 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
730 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
731 MIPS32_SW(9, 0, 15), /* sw $9,($15) */
732 MIPS32_SW(10, 0, 15), /* sw $10,($15) */
733 MIPS32_SW(11, 0, 15), /* sw $11,($15) */
734
735 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $8 = MIPS32_PRACC_PARAM_IN */
736 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
737 MIPS32_LW(9, 0, 8), /* Load write start_addr to $9 */
738 MIPS32_LW(10, 4, 8), /* Load write end_addr to $10 */
739 MIPS32_LW(11, 8, 8), /* Load write clsiz to $11 */
740
741 /* cache_loop: */
742 MIPS32_SLTU(8, 10, 9), /* sltu $8, $10, $9 : $8 <- $10 < $9 ? */
743 MIPS32_BGTZ(8, 6), /* bgtz $8, end */
744 MIPS32_NOP,
745
746 MIPS32_CACHE(MIPS32_CACHE_D_HIT_WRITEBACK, 0, 9), /* cache Hit_Writeback_D, 0($9) */
747 MIPS32_CACHE(MIPS32_CACHE_I_HIT_INVALIDATE, 0, 9), /* cache Hit_Invalidate_I, 0($9) */
748
749 MIPS32_ADDU(9, 9, 11), /* $9 += $11 */
750
751 MIPS32_B(NEG16(7)), /* b cache_loop */
752 MIPS32_NOP,
753 /* end: */
754 MIPS32_LW(11, 0, 15), /* lw $11,($15) */
755 MIPS32_LW(10, 0, 15), /* lw $10,($15) */
756 MIPS32_LW(9, 0, 15), /* lw $9,($15) */
757 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
758 MIPS32_B(NEG16(25)), /* b start */
759 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
760 };
761
762 /**
763 * Find cache line size in bytes
764 */
765 uint32_t conf;
766 uint32_t dl, clsiz;
767
768 mips32_cp0_read(ejtag_info, &conf, 16, 1);
769 dl = (conf & MIPS32_CONFIG1_DL_MASK) >> MIPS32_CONFIG1_DL_SHIFT;
770
771 /* dl encoding : dl=1 => 4 bytes, dl=2 => 8 bytes, etc... */
772 clsiz = 0x2 << dl;
773
774 /* TODO remove array */
775 uint32_t *param_in = malloc(3 * sizeof(uint32_t));
776 int retval;
777 param_in[0] = start_addr;
778 param_in[1] = end_addr;
779 param_in[2] = clsiz;
780
781 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 3, param_in, 0, NULL, 1);
782
783 free(param_in);
784
785 return retval;
786 }
787
788
789 int mips32_pracc_write_mem(struct mips_ejtag *ejtag_info, uint32_t addr, int size, int count, void *buf)
790 {
791 int retval;
792
793 switch (size) {
794 case 1:
795 retval = mips32_pracc_write_mem8(ejtag_info, addr, count, (uint8_t *)buf);
796 break;
797 case 2:
798 retval = mips32_pracc_write_mem16(ejtag_info, addr, count, (uint16_t *)buf);
799 break;
800 case 4:
801 if (count == 1)
802 retval = mips32_pracc_write_u32(ejtag_info, addr, (uint32_t *)buf);
803 else
804 retval = mips32_pracc_write_mem32(ejtag_info, addr, count, (uint32_t *)buf);
805 break;
806 default:
807 retval = ERROR_FAIL;
808 }
809
810 /**
811 * If we are in the cachable regoion and cache is activated,
812 * we must clean D$ + invalidate I$ after we did the write,
813 * so that changes do not continue to live only in D$, but to be
814 * replicated in I$ also (maybe we wrote the istructions)
815 */
816 uint32_t conf = 0;
817 int cached = 0;
818
819 mips32_cp0_read(ejtag_info, &conf, 16, 0);
820
821 switch (KSEGX(addr)) {
822 case KUSEG:
823 cached = (conf & MIPS32_CONFIG0_KU_MASK) >> MIPS32_CONFIG0_KU_SHIFT;
824 break;
825 case KSEG0:
826 cached = (conf & MIPS32_CONFIG0_K0_MASK) >> MIPS32_CONFIG0_K0_SHIFT;
827 break;
828 case KSEG1:
829 /* uncachable segment - nothing to do */
830 break;
831 case KSEG2:
832 case KSEG3:
833 cached = (conf & MIPS32_CONFIG0_K23_MASK) >> MIPS32_CONFIG0_K23_SHIFT;
834 break;
835 default:
836 /* what ? */
837 break;
838 }
839
840 /**
841 * Check cachablitiy bits coherency algorithm -
842 * is the region cacheable or uncached.
843 * If cacheable we have to synchronize the cache
844 */
845 if (cached == 0x3) {
846 uint32_t start_addr, end_addr;
847 uint32_t rel;
848
849 start_addr = addr;
850 end_addr = addr + count * size;
851
852 /** select cache synchronisation mechanism based on Architecture Release */
853 rel = (conf & MIPS32_CONFIG0_AR_MASK) >> MIPS32_CONFIG0_AR_SHIFT;
854 switch (rel) {
855 case MIPS32_ARCH_REL1:
856 /* MIPS32/64 Release 1 - we must use cache instruction */
857 mips32_pracc_clean_invalidate_cache(ejtag_info, start_addr, end_addr);
858 break;
859 case MIPS32_ARCH_REL2:
860 /* MIPS32/64 Release 2 - we can use synci instruction */
861 mips32_pracc_sync_cache(ejtag_info, start_addr, end_addr);
862 break;
863 default:
864 /* what ? */
865 break;
866 }
867 }
868
869 return retval;
870 }
871
872 static int mips32_pracc_write_mem32(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint32_t *buf)
873 {
874 static const uint32_t code[] = {
875 /* start: */
876 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
877 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
878 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
879 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
880 MIPS32_SW(9, 0, 15), /* sw $9,($15) */
881 MIPS32_SW(10, 0, 15), /* sw $10,($15) */
882 MIPS32_SW(11, 0, 15), /* sw $11,($15) */
883
884 MIPS32_ADDI(8, 15, NEG16(MIPS32_PRACC_STACK-MIPS32_PRACC_PARAM_IN)), /* $8= MIPS32_PRACC_PARAM_IN */
885 MIPS32_LW(9, 0, 8), /* Load write addr to $9 */
886 MIPS32_LW(10, 4, 8), /* Load write count to $10 */
887 MIPS32_ADDI(8, 8, 8), /* $8 += 8 beginning of data */
888
889 /* loop: */
890 MIPS32_LW(11, 0, 8), /* lw $11,0($8), Load $11 with the word @mem[$8] */
891 MIPS32_SW(11, 0, 9), /* sw $11,0($9) */
892
893 MIPS32_ADDI(9, 9, 4), /* $9 += 4 */
894 MIPS32_BNE(10, 9, NEG16(4)), /* bne $10, $9, loop */
895 MIPS32_ADDI(8, 8, 4), /* $8 += 4 */
896
897 /* end: */
898 MIPS32_LW(11, 0, 15), /* lw $11,($15) */
899 MIPS32_LW(10, 0, 15), /* lw $10,($15) */
900 MIPS32_LW(9, 0, 15), /* lw $9,($15) */
901 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
902 MIPS32_B(NEG16(21)), /* b start */
903 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
904 };
905
906 /* TODO remove array */
907 uint32_t *param_in = malloc((count + 2) * sizeof(uint32_t));
908 param_in[0] = addr;
909 param_in[1] = addr + (count * sizeof(uint32_t)); /* last address */
910
911 memcpy(&param_in[2], buf, count * sizeof(uint32_t));
912
913 int retval;
914 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
915 count + 2, param_in, 0, NULL, 1);
916
917 free(param_in);
918
919 return retval;
920 }
921
922 static int mips32_pracc_write_u32(struct mips_ejtag *ejtag_info, uint32_t addr, uint32_t *buf)
923 {
924 static const uint32_t code[] = {
925 /* start: */
926 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
927 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
928 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
929 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
930 MIPS32_SW(9, 0, 15), /* sw $9,($15) */
931
932 MIPS32_LW(8, NEG16((MIPS32_PRACC_STACK-MIPS32_PRACC_PARAM_IN)-4), 15), /* load R8 @ param_in[1] = data */
933 MIPS32_LW(9, NEG16(MIPS32_PRACC_STACK-MIPS32_PRACC_PARAM_IN), 15), /* load R9 @ param_in[0] = address */
934
935 MIPS32_SW(8, 0, 9), /* sw $8,0($9) */
936
937 MIPS32_LW(9, 0, 15), /* lw $9,($15) */
938 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
939 MIPS32_B(NEG16(11)), /* b start */
940 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
941 };
942
943 /* TODO remove array */
944 uint32_t param_in[1 + 1];
945 param_in[0] = addr;
946 param_in[1] = *buf;
947
948 return mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
949 ARRAY_SIZE(param_in), param_in, 0, NULL, 1);
950 }
951
952 static int mips32_pracc_write_mem16(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint16_t *buf)
953 {
954 static const uint32_t code[] = {
955 /* start: */
956 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
957 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
958 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
959 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
960 MIPS32_SW(9, 0, 15), /* sw $9,($15) */
961 MIPS32_SW(10, 0, 15), /* sw $10,($15) */
962 MIPS32_SW(11, 0, 15), /* sw $11,($15) */
963
964 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $8 = MIPS32_PRACC_PARAM_IN */
965 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
966 MIPS32_LW(9, 0, 8), /* Load write addr to $9 */
967 MIPS32_LW(10, 4, 8), /* Load write count to $10 */
968 MIPS32_ADDI(8, 8, 8), /* $8 += 8 */
969 /* loop: */
970 MIPS32_BEQ(0, 10, 8), /* beq $0, $10, end */
971 MIPS32_NOP,
972
973 MIPS32_LW(11, 0, 8), /* lw $11,0($8), Load $11 with the word @mem[$8] */
974 MIPS32_SH(11, 0, 9), /* sh $11,0($9) */
975
976 MIPS32_ADDI(10, 10, NEG16(1)), /* $10-- */
977 MIPS32_ADDI(9, 9, 2), /* $9 += 2 */
978 MIPS32_ADDI(8, 8, 4), /* $8 += 4 */
979
980 MIPS32_B(NEG16(8)), /* b loop */
981 MIPS32_NOP,
982 /* end: */
983 MIPS32_LW(11, 0, 15), /* lw $11,($15) */
984 MIPS32_LW(10, 0, 15), /* lw $10,($15) */
985 MIPS32_LW(9, 0, 15), /* lw $9,($15) */
986 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
987 MIPS32_B(NEG16(26)), /* b start */
988 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
989 };
990
991 /* TODO remove array */
992 uint32_t *param_in = malloc((count + 2) * sizeof(uint32_t));
993 int i;
994 param_in[0] = addr;
995 param_in[1] = count;
996
997 for (i = 0; i < count; i++)
998 param_in[i + 2] = buf[i];
999
1000 int retval;
1001 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
1002 count + 2, param_in, 0, NULL, 1);
1003
1004 free(param_in);
1005
1006 return retval;
1007 }
1008
1009 static int mips32_pracc_write_mem8(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint8_t *buf)
1010 {
1011 static const uint32_t code[] = {
1012 /* start: */
1013 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
1014 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
1015 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
1016 MIPS32_SW(8, 0, 15), /* sw $8,($15) */
1017 MIPS32_SW(9, 0, 15), /* sw $9,($15) */
1018 MIPS32_SW(10, 0, 15), /* sw $10,($15) */
1019 MIPS32_SW(11, 0, 15), /* sw $11,($15) */
1020
1021 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $8 = MIPS32_PRACC_PARAM_IN */
1022 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
1023 MIPS32_LW(9, 0, 8), /* Load write addr to $9 */
1024 MIPS32_LW(10, 4, 8), /* Load write count to $10 */
1025 MIPS32_ADDI(8, 8, 8), /* $8 += 8 */
1026 /* loop: */
1027 MIPS32_BEQ(0, 10, 8), /* beq $0, $10, end */
1028 MIPS32_NOP,
1029
1030 MIPS32_LW(11, 0, 8), /* lw $11,0($8), Load $11 with the word @mem[$8] */
1031 MIPS32_SB(11, 0, 9), /* sb $11,0($9) */
1032
1033 MIPS32_ADDI(10, 10, NEG16(1)), /* $10-- */
1034 MIPS32_ADDI(9, 9, 1), /* $9 += 1 */
1035 MIPS32_ADDI(8, 8, 4), /* $8 += 4 */
1036
1037 MIPS32_B(NEG16(8)), /* b loop */
1038 MIPS32_NOP,
1039 /* end: */
1040 MIPS32_LW(11, 0, 15), /* lw $11,($15) */
1041 MIPS32_LW(10, 0, 15), /* lw $10,($15) */
1042 MIPS32_LW(9, 0, 15), /* lw $9,($15) */
1043 MIPS32_LW(8, 0, 15), /* lw $8,($15) */
1044 MIPS32_B(NEG16(26)), /* b start */
1045 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
1046 };
1047
1048 /* TODO remove array */
1049 uint32_t *param_in = malloc((count + 2) * sizeof(uint32_t));
1050 int retval;
1051 int i;
1052 param_in[0] = addr;
1053 param_in[1] = count;
1054
1055 for (i = 0; i < count; i++)
1056 param_in[i + 2] = buf[i];
1057
1058 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
1059 count + 2, param_in, 0, NULL, 1);
1060
1061 free(param_in);
1062
1063 return retval;
1064 }
1065
1066 int mips32_pracc_write_regs(struct mips_ejtag *ejtag_info, uint32_t *regs)
1067 {
1068 static const uint32_t code[] = {
1069 /* start: */
1070 MIPS32_LUI(2, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $2 = MIPS32_PRACC_PARAM_IN */
1071 MIPS32_ORI(2, 2, LOWER16(MIPS32_PRACC_PARAM_IN)),
1072 MIPS32_LW(1, 1*4, 2), /* lw $1,1*4($2) */
1073 MIPS32_LW(15, 15*4, 2), /* lw $15,15*4($2) */
1074 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
1075 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
1076 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
1077 MIPS32_SW(1, 0, 15), /* sw $1,($15) */
1078 MIPS32_LUI(1, UPPER16(MIPS32_PRACC_PARAM_IN)), /* $1 = MIPS32_PRACC_PARAM_IN */
1079 MIPS32_ORI(1, 1, LOWER16(MIPS32_PRACC_PARAM_IN)),
1080 MIPS32_LW(3, 3*4, 1), /* lw $3,3*4($1) */
1081 MIPS32_LW(4, 4*4, 1), /* lw $4,4*4($1) */
1082 MIPS32_LW(5, 5*4, 1), /* lw $5,5*4($1) */
1083 MIPS32_LW(6, 6*4, 1), /* lw $6,6*4($1) */
1084 MIPS32_LW(7, 7*4, 1), /* lw $7,7*4($1) */
1085 MIPS32_LW(8, 8*4, 1), /* lw $8,8*4($1) */
1086 MIPS32_LW(9, 9*4, 1), /* lw $9,9*4($1) */
1087 MIPS32_LW(10, 10*4, 1), /* lw $10,10*4($1) */
1088 MIPS32_LW(11, 11*4, 1), /* lw $11,11*4($1) */
1089 MIPS32_LW(12, 12*4, 1), /* lw $12,12*4($1) */
1090 MIPS32_LW(13, 13*4, 1), /* lw $13,13*4($1) */
1091 MIPS32_LW(14, 14*4, 1), /* lw $14,14*4($1) */
1092 MIPS32_LW(16, 16*4, 1), /* lw $16,16*4($1) */
1093 MIPS32_LW(17, 17*4, 1), /* lw $17,17*4($1) */
1094 MIPS32_LW(18, 18*4, 1), /* lw $18,18*4($1) */
1095 MIPS32_LW(19, 19*4, 1), /* lw $19,19*4($1) */
1096 MIPS32_LW(20, 20*4, 1), /* lw $20,20*4($1) */
1097 MIPS32_LW(21, 21*4, 1), /* lw $21,21*4($1) */
1098 MIPS32_LW(22, 22*4, 1), /* lw $22,22*4($1) */
1099 MIPS32_LW(23, 23*4, 1), /* lw $23,23*4($1) */
1100 MIPS32_LW(24, 24*4, 1), /* lw $24,24*4($1) */
1101 MIPS32_LW(25, 25*4, 1), /* lw $25,25*4($1) */
1102 MIPS32_LW(26, 26*4, 1), /* lw $26,26*4($1) */
1103 MIPS32_LW(27, 27*4, 1), /* lw $27,27*4($1) */
1104 MIPS32_LW(28, 28*4, 1), /* lw $28,28*4($1) */
1105 MIPS32_LW(29, 29*4, 1), /* lw $29,29*4($1) */
1106 MIPS32_LW(30, 30*4, 1), /* lw $30,30*4($1) */
1107 MIPS32_LW(31, 31*4, 1), /* lw $31,31*4($1) */
1108
1109 MIPS32_LW(2, 32*4, 1), /* lw $2,32*4($1) */
1110 MIPS32_MTC0(2, 12, 0), /* move $2 to status */
1111 MIPS32_LW(2, 33*4, 1), /* lw $2,33*4($1) */
1112 MIPS32_MTLO(2), /* move $2 to lo */
1113 MIPS32_LW(2, 34*4, 1), /* lw $2,34*4($1) */
1114 MIPS32_MTHI(2), /* move $2 to hi */
1115 MIPS32_LW(2, 35*4, 1), /* lw $2,35*4($1) */
1116 MIPS32_MTC0(2, 8, 0), /* move $2 to badvaddr */
1117 MIPS32_LW(2, 36*4, 1), /* lw $2,36*4($1) */
1118 MIPS32_MTC0(2, 13, 0), /* move $2 to cause*/
1119 MIPS32_LW(2, 37*4, 1), /* lw $2,37*4($1) */
1120 MIPS32_MTC0(2, 24, 0), /* move $2 to depc (pc) */
1121
1122 MIPS32_LW(2, 2*4, 1), /* lw $2,2*4($1) */
1123 MIPS32_LW(1, 0, 15), /* lw $1,($15) */
1124 MIPS32_B(NEG16(53)), /* b start */
1125 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
1126 };
1127
1128 int retval;
1129
1130 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
1131 MIPS32NUMCOREREGS, regs, 0, NULL, 1);
1132
1133 return retval;
1134 }
1135
1136 int mips32_pracc_read_regs(struct mips_ejtag *ejtag_info, uint32_t *regs)
1137 {
1138 static const uint32_t code[] = {
1139 /* start: */
1140 MIPS32_MTC0(2, 31, 0), /* move $2 to COP0 DeSave */
1141 MIPS32_LUI(2, UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $2 = MIPS32_PRACC_PARAM_OUT */
1142 MIPS32_ORI(2, 2, LOWER16(MIPS32_PRACC_PARAM_OUT)),
1143 MIPS32_SW(0, 0*4, 2), /* sw $0,0*4($2) */
1144 MIPS32_SW(1, 1*4, 2), /* sw $1,1*4($2) */
1145 MIPS32_SW(15, 15*4, 2), /* sw $15,15*4($2) */
1146 MIPS32_MFC0(2, 31, 0), /* move COP0 DeSave to $2 */
1147 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
1148 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
1149 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
1150 MIPS32_SW(1, 0, 15), /* sw $1,($15) */
1151 MIPS32_SW(2, 0, 15), /* sw $2,($15) */
1152 MIPS32_LUI(1, UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $1 = MIPS32_PRACC_PARAM_OUT */
1153 MIPS32_ORI(1, 1, LOWER16(MIPS32_PRACC_PARAM_OUT)),
1154 MIPS32_SW(2, 2*4, 1), /* sw $2,2*4($1) */
1155 MIPS32_SW(3, 3*4, 1), /* sw $3,3*4($1) */
1156 MIPS32_SW(4, 4*4, 1), /* sw $4,4*4($1) */
1157 MIPS32_SW(5, 5*4, 1), /* sw $5,5*4($1) */
1158 MIPS32_SW(6, 6*4, 1), /* sw $6,6*4($1) */
1159 MIPS32_SW(7, 7*4, 1), /* sw $7,7*4($1) */
1160 MIPS32_SW(8, 8*4, 1), /* sw $8,8*4($1) */
1161 MIPS32_SW(9, 9*4, 1), /* sw $9,9*4($1) */
1162 MIPS32_SW(10, 10*4, 1), /* sw $10,10*4($1) */
1163 MIPS32_SW(11, 11*4, 1), /* sw $11,11*4($1) */
1164 MIPS32_SW(12, 12*4, 1), /* sw $12,12*4($1) */
1165 MIPS32_SW(13, 13*4, 1), /* sw $13,13*4($1) */
1166 MIPS32_SW(14, 14*4, 1), /* sw $14,14*4($1) */
1167 MIPS32_SW(16, 16*4, 1), /* sw $16,16*4($1) */
1168 MIPS32_SW(17, 17*4, 1), /* sw $17,17*4($1) */
1169 MIPS32_SW(18, 18*4, 1), /* sw $18,18*4($1) */
1170 MIPS32_SW(19, 19*4, 1), /* sw $19,19*4($1) */
1171 MIPS32_SW(20, 20*4, 1), /* sw $20,20*4($1) */
1172 MIPS32_SW(21, 21*4, 1), /* sw $21,21*4($1) */
1173 MIPS32_SW(22, 22*4, 1), /* sw $22,22*4($1) */
1174 MIPS32_SW(23, 23*4, 1), /* sw $23,23*4($1) */
1175 MIPS32_SW(24, 24*4, 1), /* sw $24,24*4($1) */
1176 MIPS32_SW(25, 25*4, 1), /* sw $25,25*4($1) */
1177 MIPS32_SW(26, 26*4, 1), /* sw $26,26*4($1) */
1178 MIPS32_SW(27, 27*4, 1), /* sw $27,27*4($1) */
1179 MIPS32_SW(28, 28*4, 1), /* sw $28,28*4($1) */
1180 MIPS32_SW(29, 29*4, 1), /* sw $29,29*4($1) */
1181 MIPS32_SW(30, 30*4, 1), /* sw $30,30*4($1) */
1182 MIPS32_SW(31, 31*4, 1), /* sw $31,31*4($1) */
1183
1184 MIPS32_MFC0(2, 12, 0), /* move status to $2 */
1185 MIPS32_SW(2, 32*4, 1), /* sw $2,32*4($1) */
1186 MIPS32_MFLO(2), /* move lo to $2 */
1187 MIPS32_SW(2, 33*4, 1), /* sw $2,33*4($1) */
1188 MIPS32_MFHI(2), /* move hi to $2 */
1189 MIPS32_SW(2, 34*4, 1), /* sw $2,34*4($1) */
1190 MIPS32_MFC0(2, 8, 0), /* move badvaddr to $2 */
1191 MIPS32_SW(2, 35*4, 1), /* sw $2,35*4($1) */
1192 MIPS32_MFC0(2, 13, 0), /* move cause to $2 */
1193 MIPS32_SW(2, 36*4, 1), /* sw $2,36*4($1) */
1194 MIPS32_MFC0(2, 24, 0), /* move depc (pc) to $2 */
1195 MIPS32_SW(2, 37*4, 1), /* sw $2,37*4($1) */
1196
1197 MIPS32_LW(2, 0, 15), /* lw $2,($15) */
1198 MIPS32_LW(1, 0, 15), /* lw $1,($15) */
1199 MIPS32_B(NEG16(58)), /* b start */
1200 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
1201 };
1202
1203 int retval;
1204
1205 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
1206 0, NULL, MIPS32NUMCOREREGS, regs, 1);
1207
1208 return retval;
1209 }
1210
1211 /* fastdata upload/download requires an initialized working area
1212 * to load the download code; it should not be called otherwise
1213 * fetch order from the fastdata area
1214 * 1. start addr
1215 * 2. end addr
1216 * 3. data ...
1217 */
1218 int mips32_pracc_fastdata_xfer(struct mips_ejtag *ejtag_info, struct working_area *source,
1219 int write_t, uint32_t addr, int count, uint32_t *buf)
1220 {
1221 uint32_t handler_code[] = {
1222 /* caution when editing, table is modified below */
1223 /* r15 points to the start of this code */
1224 MIPS32_SW(8, MIPS32_FASTDATA_HANDLER_SIZE - 4, 15),
1225 MIPS32_SW(9, MIPS32_FASTDATA_HANDLER_SIZE - 8, 15),
1226 MIPS32_SW(10, MIPS32_FASTDATA_HANDLER_SIZE - 12, 15),
1227 MIPS32_SW(11, MIPS32_FASTDATA_HANDLER_SIZE - 16, 15),
1228 /* start of fastdata area in t0 */
1229 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_FASTDATA_AREA)),
1230 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_FASTDATA_AREA)),
1231 MIPS32_LW(9, 0, 8), /* start addr in t1 */
1232 MIPS32_LW(10, 0, 8), /* end addr to t2 */
1233 /* loop: */
1234 /* 8 */ MIPS32_LW(11, 0, 0), /* lw t3,[t8 | r9] */
1235 /* 9 */ MIPS32_SW(11, 0, 0), /* sw t3,[r9 | r8] */
1236 MIPS32_BNE(10, 9, NEG16(3)), /* bne $t2,t1,loop */
1237 MIPS32_ADDI(9, 9, 4), /* addi t1,t1,4 */
1238
1239 MIPS32_LW(8, MIPS32_FASTDATA_HANDLER_SIZE - 4, 15),
1240 MIPS32_LW(9, MIPS32_FASTDATA_HANDLER_SIZE - 8, 15),
1241 MIPS32_LW(10, MIPS32_FASTDATA_HANDLER_SIZE - 12, 15),
1242 MIPS32_LW(11, MIPS32_FASTDATA_HANDLER_SIZE - 16, 15),
1243
1244 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_TEXT)),
1245 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_TEXT)),
1246 MIPS32_JR(15), /* jr start */
1247 MIPS32_MFC0(15, 31, 0), /* move COP0 DeSave to $15 */
1248 };
1249
1250 uint32_t jmp_code[] = {
1251 MIPS32_MTC0(15, 31, 0), /* move $15 to COP0 DeSave */
1252 /* 1 */ MIPS32_LUI(15, 0), /* addr of working area added below */
1253 /* 2 */ MIPS32_ORI(15, 15, 0), /* addr of working area added below */
1254 MIPS32_JR(15), /* jump to ram program */
1255 MIPS32_NOP,
1256 };
1257
1258 int retval, i;
1259 uint32_t val, ejtag_ctrl, address;
1260
1261 if (source->size < MIPS32_FASTDATA_HANDLER_SIZE)
1262 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1263
1264 if (write_t) {
1265 handler_code[8] = MIPS32_LW(11, 0, 8); /* load data from probe at fastdata area */
1266 handler_code[9] = MIPS32_SW(11, 0, 9); /* store data to RAM @ r9 */
1267 } else {
1268 handler_code[8] = MIPS32_LW(11, 0, 9); /* load data from RAM @ r9 */
1269 handler_code[9] = MIPS32_SW(11, 0, 8); /* store data to probe at fastdata area */
1270 }
1271
1272 /* write program into RAM */
1273 if (write_t != ejtag_info->fast_access_save) {
1274 mips32_pracc_write_mem32(ejtag_info, source->address, ARRAY_SIZE(handler_code), handler_code);
1275 /* save previous operation to speed to any consecutive read/writes */
1276 ejtag_info->fast_access_save = write_t;
1277 }
1278
1279 LOG_DEBUG("%s using 0x%.8" PRIx32 " for write handler", __func__, source->address);
1280
1281 jmp_code[1] |= UPPER16(source->address);
1282 jmp_code[2] |= LOWER16(source->address);
1283
1284 for (i = 0; i < (int) ARRAY_SIZE(jmp_code); i++) {
1285 retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl);
1286 if (retval != ERROR_OK)
1287 return retval;
1288
1289 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA);
1290 mips_ejtag_drscan_32_out(ejtag_info, jmp_code[i]);
1291
1292 /* Clear the access pending bit (let the processor eat!) */
1293 ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_PRACC;
1294 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
1295 mips_ejtag_drscan_32_out(ejtag_info, ejtag_ctrl);
1296 }
1297
1298 retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl);
1299 if (retval != ERROR_OK)
1300 return retval;
1301
1302 /* next fetch to dmseg should be in FASTDATA_AREA, check */
1303 address = 0;
1304 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS);
1305 retval = mips_ejtag_drscan_32(ejtag_info, &address);
1306 if (retval != ERROR_OK)
1307 return retval;
1308
1309 if (address != MIPS32_PRACC_FASTDATA_AREA)
1310 return ERROR_FAIL;
1311
1312 /* wait PrAcc pending bit for FASTDATA write */
1313 retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl);
1314 if (retval != ERROR_OK)
1315 return retval;
1316
1317 /* Send the load start address */
1318 val = addr;
1319 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_FASTDATA);
1320 mips_ejtag_fastdata_scan(ejtag_info, 1, &val);
1321
1322 /* Send the load end address */
1323 val = addr + (count - 1) * 4;
1324 mips_ejtag_fastdata_scan(ejtag_info, 1, &val);
1325
1326 for (i = 0; i < count; i++) {
1327 retval = mips_ejtag_fastdata_scan(ejtag_info, write_t, buf++);
1328 if (retval != ERROR_OK)
1329 return retval;
1330 }
1331
1332 retval = jtag_execute_queue();
1333 if (retval != ERROR_OK) {
1334 LOG_ERROR("fastdata load failed");
1335 return retval;
1336 }
1337
1338 retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl);
1339 if (retval != ERROR_OK)
1340 return retval;
1341
1342 address = 0;
1343 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS);
1344 retval = mips_ejtag_drscan_32(ejtag_info, &address);
1345 if (retval != ERROR_OK)
1346 return retval;
1347
1348 if (address != MIPS32_PRACC_TEXT)
1349 LOG_ERROR("mini program did not return to start");
1350
1351 return retval;
1352 }
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