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   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 wordsread;
 347         uint32_t param_in[2];
 348
 349         wordsread = 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[wordsread], 1);
 361                 if (retval != ERROR_OK)
 362                         return retval;
 363
 364                 count -= blocksize;
 365                 addr += blocksize*sizeof(uint32_t);
 366                 wordsread += 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         if (param_out == NULL) {
 446                 LOG_ERROR("Out of memory");
 447                 return ERROR_FAIL;
 448         }
 449
 450         int retval = ERROR_OK;
 451         int blocksize;
 452         int hwordsread = 0;
 453         uint32_t param_in[2];
 454
 455         while (count > 0) {
 456                 blocksize = count;
 457                 if (count > 0x400)
 458                         blocksize = 0x400;
 459
 460                 param_in[0] = addr;
 461                 param_in[1] = blocksize;
 462
 463                 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
 464                         ARRAY_SIZE(param_in), param_in, blocksize, &param_out[hwordsread], 1);
 465
 466                 if (retval != ERROR_OK)
 467                         return retval;
 468
 469                 count -= blocksize;
 470                 addr += blocksize*sizeof(uint16_t);
 471                 hwordsread += blocksize;
 472         }
 473
 474         int i;
 475         for (i = 0; i < hwordsread; i++)
 476                 buf[i] = param_out[i];
 477
 478         free(param_out);
 479         return retval;
 480 }
 481
 482 static int mips32_pracc_read_mem8(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint8_t *buf)
 483 {
 484         static const uint32_t code[] = {
 485                                                                                                                         /* start: */
 486                 MIPS32_MTC0(15, 31, 0),                                                         /* move $15 to COP0 DeSave */
 487                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)),            /* $15 = MIPS32_PRACC_STACK */
 488                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
 489                 MIPS32_SW(8, 0, 15),                                                            /* sw $8,($15) */
 490                 MIPS32_SW(9, 0, 15),                                                            /* sw $9,($15) */
 491                 MIPS32_SW(10, 0, 15),                                                           /* sw $10,($15) */
 492                 MIPS32_SW(11, 0, 15),                                                           /* sw $11,($15) */
 493
 494                 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)),          /* $8 = MIPS32_PRACC_PARAM_IN */
 495                 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
 496                 MIPS32_LW(9, 0, 8),                                                                     /* $9 = mem[$8]; read addr */
 497                 MIPS32_LW(10, 4, 8),                                                            /* $10 = mem[$8 + 4]; read count */
 498                 MIPS32_LUI(11, UPPER16(MIPS32_PRACC_PARAM_OUT)),        /* $11 = MIPS32_PRACC_PARAM_OUT */
 499                 MIPS32_ORI(11, 11, LOWER16(MIPS32_PRACC_PARAM_OUT)),
 500                                                                                                                         /* loop: */
 501                 MIPS32_BEQ(0, 10, 8),                                                           /* beq 0, $10, end */
 502                 MIPS32_NOP,
 503
 504                 MIPS32_LBU(8, 0, 9),                                                            /* lw $8,0($9), Load t4 with the byte @mem[t1] */
 505                 MIPS32_SW(8, 0, 11),                                                            /* sw $8,0($11) */
 506
 507                 MIPS32_ADDI(10, 10, NEG16(1)),                                          /* $10-- */
 508                 MIPS32_ADDI(9, 9, 1),                                                           /* $9 += 1 */
 509                 MIPS32_ADDI(11, 11, 4),                                                         /* $11 += 4 */
 510                 MIPS32_B(NEG16(8)),                                                                     /* b loop */
 511                 MIPS32_NOP,
 512                                                                                                                         /* end: */
 513                 MIPS32_LW(11, 0, 15),                                                           /* lw $11,($15) */
 514                 MIPS32_LW(10, 0, 15),                                                           /* lw $10,($15) */
 515                 MIPS32_LW(9, 0, 15),                                                            /* lw $9,($15) */
 516                 MIPS32_LW(8, 0, 15),                                                            /* lw $8,($15) */
 517                 MIPS32_B(NEG16(27)),                                                            /* b start */
 518                 MIPS32_MFC0(15, 31, 0),                                                         /* move COP0 DeSave to $15 */
 519         };
 520
 521         /* TODO remove array */
 522         uint32_t *param_out = malloc(count * sizeof(uint32_t));
 523         if (param_out == NULL) {
 524                 LOG_ERROR("Out of memory");
 525                 return ERROR_FAIL;
 526         }
 527
 528         int retval = ERROR_OK;
 529         int blocksize;
 530         uint32_t param_in[2];
 531         int bytesread = 0;
 532
 533         while (count > 0) {
 534                 blocksize = count;
 535                 if (count > 0x400)
 536                         blocksize = 0x400;
 537
 538                 param_in[0] = addr;
 539                 param_in[1] = blocksize;
 540
 541                 retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
 542                         ARRAY_SIZE(param_in), param_in, count, &param_out[bytesread], 1);
 543
 544                 if (retval != ERROR_OK)
 545                         return retval;
 546
 547                 count -= blocksize;
 548                 addr += blocksize;
 549                 bytesread += blocksize;
 550         }
 551         int i;
 552         for (i = 0; i < bytesread; i++)
 553                 buf[i] = param_out[i];
 554
 555         free(param_out);
 556         return retval;
 557 }
 558
 559 int mips32_cp0_read(struct mips_ejtag *ejtag_info, uint32_t *val, uint32_t cp0_reg, uint32_t cp0_sel)
 560 {
 561         /**
 562          * Do not make this code static, but regenerate it every time,
 563          * as 5th element has to be changed to add parameters
 564          */
 565         uint32_t code[] = {
 566                                                                                                                         /* start: */
 567                 MIPS32_MTC0(15, 31, 0),                                                         /* move $15 to COP0 DeSave */
 568                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)),            /* $15 = MIPS32_PRACC_STACK */
 569                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
 570                 MIPS32_SW(8, 0, 15),                                                            /* sw $8,($15) */
 571                 MIPS32_SW(9, 0, 15),                                                            /* sw $9,($15) */
 572
 573                 /* 5 */ MIPS32_MFC0(8, 0, 0),                                           /* move COP0 [cp0_reg select] to $8 */
 574
 575                 MIPS32_LUI(9, UPPER16(MIPS32_PRACC_PARAM_OUT)),         /* $11 = MIPS32_PRACC_PARAM_OUT */
 576                 MIPS32_ORI(9, 9, LOWER16(MIPS32_PRACC_PARAM_OUT)),
 577                 MIPS32_SW(8, 0, 9),                                                                     /* sw $8,0($9) */
 578
 579                 MIPS32_LW(9, 0, 15),                                                            /* lw $9,($15) */
 580                 MIPS32_LW(8, 0, 15),                                                            /* lw $8,($15) */
 581                 MIPS32_B(NEG16(12)),                                                            /* b start */
 582                 MIPS32_MFC0(15, 31, 0),                                                         /* move COP0 DeSave to $15 */
 583         };
 584
 585         /**
 586          * Note that our input parametes cp0_reg and cp0_sel
 587          * are numbers (not gprs) which make part of mfc0 instruction opcode.
 588          *
 589          * These are not fix, but can be different for each mips32_cp0_read() function call,
 590          * and that is why we must insert them directly into opcode,
 591          * i.e. we can not pass it on EJTAG microprogram stack (via param_in),
 592          * and put them into the gprs later from MIPS32_PRACC_STACK
 593          * because mfc0 do not use gpr as a parameter for the cp0_reg and select part,
 594          * but plain (immediate) number.
 595          *
 596          * MIPS32_MTC0 is implemented via MIPS32_R_INST macro.
 597          * In order to insert our parameters, we must change rd and funct fields.
 598          */
 599         code[5] |= (cp0_reg << 11) | cp0_sel;  /* change rd and funct of MIPS32_R_INST macro */
 600
 601         /* TODO remove array */
 602         uint32_t *param_out = val;
 603         int retval;
 604
 605         retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 0, NULL, 1, param_out, 1);
 606
 607         return retval;
 608 }
 609
 610 int mips32_cp0_write(struct mips_ejtag *ejtag_info,
 611                 uint32_t val, uint32_t cp0_reg, uint32_t cp0_sel)
 612 {
 613         uint32_t code[] = {
 614                                                                                                                         /* start: */
 615                 MIPS32_MTC0(15, 31, 0),                                                         /* move $15 to COP0 DeSave */
 616                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)),            /* $15 = MIPS32_PRACC_STACK */
 617                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
 618                 MIPS32_SW(8, 0, 15),                                                            /* sw $8,($15) */
 619                 MIPS32_SW(9, 0, 15),                                                            /* sw $9,($15) */
 620
 621                 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)),          /* $8 = MIPS32_PRACC_PARAM_IN */
 622                 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
 623                 MIPS32_LW(9, 0, 8),                                                                     /* Load write val to $9 */
 624
 625                 /* 8 */ MIPS32_MTC0(9, 0, 0),                                           /* move $9 to COP0 [cp0_reg select] */
 626
 627                 MIPS32_LW(9, 0, 15),                                                            /* lw $9,($15) */
 628                 MIPS32_LW(8, 0, 15),                                                            /* lw $8,($15) */
 629                 MIPS32_B(NEG16(12)),                                                            /* b start */
 630                 MIPS32_MFC0(15, 31, 0),                                                         /* move COP0 DeSave to $15 */
 631         };
 632
 633         /**
 634          * Note that MIPS32_MTC0 macro is implemented via MIPS32_R_INST macro.
 635          * In order to insert our parameters, we must change rd and funct fields.
 636          */
 637         code[8] |= (cp0_reg << 11) | cp0_sel;  /* change rd and funct fields of MIPS32_R_INST macro */
 638
 639         /* TODO remove array */
 640         uint32_t *param_in = malloc(1 * sizeof(uint32_t));
 641         int retval;
 642         param_in[0] = val;
 643
 644         retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 1, param_in, 0, NULL, 1);
 645
 646         free(param_in);
 647
 648         return retval;
 649 }
 650
 651 /**
 652  * \b mips32_pracc_sync_cache
 653  *
 654  * Synchronize Caches to Make Instruction Writes Effective
 655  * (ref. doc. MIPS32 Architecture For Programmers Volume II: The MIPS32 Instruction Set,
 656  *  Document Number: MD00086, Revision 2.00, June 9, 2003)
 657  *
 658  * When the instruction stream is written, the SYNCI instruction should be used
 659  * in conjunction with other instructions to make the newly-written instructions effective.
 660  *
 661  * Explanation :
 662  * A program that loads another program into memory is actually writing the D- side cache.
 663  * The instructions it has loaded can't be executed until they reach the I-cache.
 664  *
 665  * After the instructions have been written, the loader should arrange
 666  * to write back any containing D-cache line and invalidate any locations
 667  * already in the I-cache.
 668  *
 669  * You can do that with cache instructions, but those instructions are only available in kernel mode,
 670  * and a loader writing instructions for the use of its own process need not be privileged software.
 671  *
 672  * In the latest MIPS32/64 CPUs, MIPS provides the synci instruction,
 673  * which does the whole job for a cache-line-sized chunk of the memory you just loaded:
 674  * That is, it arranges a D-cache write-back and an I-cache invalidate.
 675  *
 676  * To employ synci at user level, you need to know the size of a cache line,
 677  * and that can be obtained with a rdhwr SYNCI_Step
 678  * from one of the standard “hardware registers”.
 679  */
 680 static int mips32_pracc_sync_cache(struct mips_ejtag *ejtag_info,
 681                 uint32_t start_addr, uint32_t end_addr)
 682 {
 683         static const uint32_t code[] = {
 684                                                                                                                         /* start: */
 685                 MIPS32_MTC0(15, 31, 0),                                                         /* move $15 to COP0 DeSave */
 686                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)),            /* $15 = MIPS32_PRACC_STACK */
 687                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
 688                 MIPS32_SW(8, 0, 15),                                                            /* sw $8,($15) */
 689                 MIPS32_SW(9, 0, 15),                                                            /* sw $9,($15) */
 690                 MIPS32_SW(10, 0, 15),                                                           /* sw $10,($15) */
 691                 MIPS32_SW(11, 0, 15),                                                           /* sw $11,($15) */
 692
 693                 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)),          /* $8 = MIPS32_PRACC_PARAM_IN */
 694                 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
 695                 MIPS32_LW(9, 0, 8),                                                                     /* Load write start_addr to $9 */
 696                 MIPS32_LW(10, 4, 8),                                                            /* Load write end_addr to $10 */
 697
 698                 MIPS32_RDHWR(11, MIPS32_SYNCI_STEP),                            /* $11 = MIPS32_SYNCI_STEP */
 699                 MIPS32_BEQ(11, 0, 6),                                                           /* beq $11, $0, end */
 700                 MIPS32_NOP,
 701                                                                                                                         /* synci_loop : */
 702                 MIPS32_SYNCI(0, 9),                                                                     /* synci 0($9) */
 703                 MIPS32_SLTU(8, 10, 9),                                                          /* sltu $8, $10, $9  # $8 = $10 < $9 ? 1 : 0 */
 704                 MIPS32_BNE(8, 0, NEG16(3)),                                                     /* bne $8, $0, synci_loop */
 705                 MIPS32_ADDU(9, 9, 11),                                                          /* $9 += MIPS32_SYNCI_STEP */
 706                 MIPS32_SYNC,
 707                                                                                                                         /* end: */
 708                 MIPS32_LW(11, 0, 15),                                                           /* lw $11,($15) */
 709                 MIPS32_LW(10, 0, 15),                                                           /* lw $10,($15) */
 710                 MIPS32_LW(9, 0, 15),                                                            /* lw $9,($15) */
 711                 MIPS32_LW(8, 0, 15),                                                            /* lw $8,($15) */
 712                 MIPS32_B(NEG16(24)),                                                            /* b start */
 713                 MIPS32_MFC0(15, 31, 0),                                                         /* move COP0 DeSave to $15 */
 714         };
 715
 716         /* TODO remove array */
 717         uint32_t *param_in = malloc(2 * sizeof(uint32_t));
 718         int retval;
 719         param_in[0] = start_addr;
 720         param_in[1] = end_addr;
 721
 722         retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 2, param_in, 0, NULL, 1);
 723
 724         free(param_in);
 725
 726         return retval;
 727 }
 728
 729 /**
 730  * \b mips32_pracc_clean_invalidate_cache
 731  *
 732  * Writeback D$ and Invalidate I$
 733  * so that the instructions written can be visible to CPU
 734  */
 735 static int mips32_pracc_clean_invalidate_cache(struct mips_ejtag *ejtag_info,
 736                                                                                                         uint32_t start_addr, uint32_t end_addr)
 737 {
 738         static const uint32_t code[] = {
 739                                                                                                                         /* start: */
 740                 MIPS32_MTC0(15, 31, 0),                                                         /* move $15 to COP0 DeSave */
 741                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)),            /* $15 = MIPS32_PRACC_STACK */
 742                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
 743                 MIPS32_SW(8, 0, 15),                                                            /* sw $8,($15) */
 744                 MIPS32_SW(9, 0, 15),                                                            /* sw $9,($15) */
 745                 MIPS32_SW(10, 0, 15),                                                           /* sw $10,($15) */
 746                 MIPS32_SW(11, 0, 15),                                                           /* sw $11,($15) */
 747
 748                 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)),          /* $8 = MIPS32_PRACC_PARAM_IN */
 749                 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
 750                 MIPS32_LW(9, 0, 8),                                                                     /* Load write start_addr to $9 */
 751                 MIPS32_LW(10, 4, 8),                                                            /* Load write end_addr to $10 */
 752                 MIPS32_LW(11, 8, 8),                                                            /* Load write clsiz to $11 */
 753
 754                                                                                                                         /* cache_loop: */
 755                 MIPS32_SLTU(8, 10, 9),                                                          /* sltu $8, $10, $9  :  $8 <- $10 < $9 ? */
 756                 MIPS32_BGTZ(8, 6),                                                                      /* bgtz $8, end */
 757                 MIPS32_NOP,
 758
 759                 MIPS32_CACHE(MIPS32_CACHE_D_HIT_WRITEBACK, 0, 9),               /* cache Hit_Writeback_D, 0($9) */
 760                 MIPS32_CACHE(MIPS32_CACHE_I_HIT_INVALIDATE, 0, 9),      /* cache Hit_Invalidate_I, 0($9) */
 761
 762                 MIPS32_ADDU(9, 9, 11),                                                          /* $9 += $11 */
 763
 764                 MIPS32_B(NEG16(7)),                                                                     /* b cache_loop */
 765                 MIPS32_NOP,
 766                                                                                                                         /* end: */
 767                 MIPS32_LW(11, 0, 15),                                                           /* lw $11,($15) */
 768                 MIPS32_LW(10, 0, 15),                                                           /* lw $10,($15) */
 769                 MIPS32_LW(9, 0, 15),                                                            /* lw $9,($15) */
 770                 MIPS32_LW(8, 0, 15),                                                            /* lw $8,($15) */
 771                 MIPS32_B(NEG16(25)),                                                            /* b start */
 772                 MIPS32_MFC0(15, 31, 0),                                                         /* move COP0 DeSave to $15 */
 773         };
 774
 775         /**
 776          * Find cache line size in bytes
 777          */
 778         uint32_t conf;
 779         uint32_t dl, clsiz;
 780
 781         mips32_cp0_read(ejtag_info, &conf, 16, 1);
 782         dl = (conf & MIPS32_CONFIG1_DL_MASK) >> MIPS32_CONFIG1_DL_SHIFT;
 783
 784         /* dl encoding : dl=1 => 4 bytes, dl=2 => 8 bytes, etc... */
 785         clsiz = 0x2 << dl;
 786
 787         /* TODO remove array */
 788         uint32_t *param_in = malloc(3 * sizeof(uint32_t));
 789         int retval;
 790         param_in[0] = start_addr;
 791         param_in[1] = end_addr;
 792         param_in[2] = clsiz;
 793
 794         retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, 3, param_in, 0, NULL, 1);
 795
 796         free(param_in);
 797
 798         return retval;
 799 }
 800
 801
 802 int mips32_pracc_write_mem(struct mips_ejtag *ejtag_info, uint32_t addr, int size, int count, void *buf)
 803 {
 804         int retval;
 805
 806         switch (size) {
 807                 case 1:
 808                         retval = mips32_pracc_write_mem8(ejtag_info, addr, count, (uint8_t *)buf);
 809                         break;
 810                 case 2:
 811                         retval = mips32_pracc_write_mem16(ejtag_info, addr, count, (uint16_t *)buf);
 812                         break;
 813                 case 4:
 814                         if (count == 1)
 815                                 retval = mips32_pracc_write_u32(ejtag_info, addr, (uint32_t *)buf);
 816                         else
 817                                 retval = mips32_pracc_write_mem32(ejtag_info, addr, count, (uint32_t *)buf);
 818                         break;
 819                 default:
 820                         retval = ERROR_FAIL;
 821         }
 822
 823         /**
 824          * If we are in the cachable regoion and cache is activated,
 825          * we must clean D$ + invalidate I$ after we did the write,
 826          * so that changes do not continue to live only in D$, but to be
 827          * replicated in I$ also (maybe we wrote the istructions)
 828          */
 829         uint32_t conf = 0;
 830         int cached = 0;
 831
 832         mips32_cp0_read(ejtag_info, &conf, 16, 0);
 833
 834         switch (KSEGX(addr)) {
 835                 case KUSEG:
 836                         cached = (conf & MIPS32_CONFIG0_KU_MASK) >> MIPS32_CONFIG0_KU_SHIFT;
 837                         break;
 838                 case KSEG0:
 839                         cached = (conf & MIPS32_CONFIG0_K0_MASK) >> MIPS32_CONFIG0_K0_SHIFT;
 840                         break;
 841                 case KSEG1:
 842                         /* uncachable segment - nothing to do */
 843                         break;
 844                 case KSEG2:
 845                 case KSEG3:
 846                         cached = (conf & MIPS32_CONFIG0_K23_MASK) >> MIPS32_CONFIG0_K23_SHIFT;
 847                         break;
 848                 default:
 849                         /* what ? */
 850                         break;
 851         }
 852
 853         /**
 854          * Check cachablitiy bits coherency algorithm -
 855          * is the region cacheable or uncached.
 856          * If cacheable we have to synchronize the cache
 857          */
 858         if (cached == 0x3) {
 859                 uint32_t start_addr, end_addr;
 860                 uint32_t rel;
 861
 862                 start_addr = addr;
 863                 end_addr = addr + count * size;
 864
 865                 /** select cache synchronisation mechanism based on Architecture Release */
 866                 rel = (conf & MIPS32_CONFIG0_AR_MASK) >> MIPS32_CONFIG0_AR_SHIFT;
 867                 switch (rel) {
 868                         case MIPS32_ARCH_REL1:
 869                                 /* MIPS32/64 Release 1 - we must use cache instruction */
 870                                 mips32_pracc_clean_invalidate_cache(ejtag_info, start_addr, end_addr);
 871                                 break;
 872                         case MIPS32_ARCH_REL2:
 873                                 /* MIPS32/64 Release 2 - we can use synci instruction */
 874                                 mips32_pracc_sync_cache(ejtag_info, start_addr, end_addr);
 875                                 break;
 876                         default:
 877                                 /* what ? */
 878                                 break;
 879                 }
 880         }
 881
 882         return retval;
 883 }
 884
 885 static int mips32_pracc_write_mem32(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint32_t *buf)
 886 {
 887         static const uint32_t code[] = {
 888                                                                                                                         /* start: */
 889                 MIPS32_MTC0(15, 31, 0),                                                         /* move $15 to COP0 DeSave */
 890                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)),            /* $15 = MIPS32_PRACC_STACK */
 891                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
 892                 MIPS32_SW(8, 0, 15),                                                            /* sw $8,($15) */
 893                 MIPS32_SW(9, 0, 15),                                                            /* sw $9,($15) */
 894                 MIPS32_SW(10, 0, 15),                                                           /* sw $10,($15) */
 895                 MIPS32_SW(11, 0, 15),                                                           /* sw $11,($15) */
 896
 897                 MIPS32_ADDI(8, 15, NEG16(MIPS32_PRACC_STACK-MIPS32_PRACC_PARAM_IN)),  /* $8= MIPS32_PRACC_PARAM_IN */
 898                 MIPS32_LW(9, 0, 8),                                                                     /* Load write addr to $9 */
 899                 MIPS32_LW(10, 4, 8),                                                            /* Load write count to $10 */
 900                 MIPS32_ADDI(8, 8, 8),                                                           /* $8 += 8 beginning of data */
 901
 902                                                                                                                         /* loop: */
 903                 MIPS32_LW(11, 0, 8),                                                            /* lw $11,0($8), Load $11 with the word @mem[$8] */
 904                 MIPS32_SW(11, 0, 9),                                                            /* sw $11,0($9) */
 905
 906                 MIPS32_ADDI(9, 9, 4),                                                           /* $9 += 4 */
 907                 MIPS32_BNE(10, 9, NEG16(4)),                                            /* bne $10, $9, loop */
 908                 MIPS32_ADDI(8, 8, 4),                                                           /* $8 += 4 */
 909
 910                                                                                                                         /* end: */
 911                 MIPS32_LW(11, 0, 15),                                                           /* lw $11,($15) */
 912                 MIPS32_LW(10, 0, 15),                                                           /* lw $10,($15) */
 913                 MIPS32_LW(9, 0, 15),                                                            /* lw $9,($15) */
 914                 MIPS32_LW(8, 0, 15),                                                            /* lw $8,($15) */
 915                 MIPS32_B(NEG16(21)),                                                            /* b start */
 916                 MIPS32_MFC0(15, 31, 0),                                                         /* move COP0 DeSave to $15 */
 917         };
 918
 919         /* TODO remove array */
 920         uint32_t *param_in = malloc((count + 2) * sizeof(uint32_t));
 921         param_in[0] = addr;
 922         param_in[1] = addr + (count * sizeof(uint32_t));        /* last address */
 923
 924         memcpy(&param_in[2], buf, count * sizeof(uint32_t));
 925
 926         int retval;
 927         retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
 928                 count + 2, param_in, 0, NULL, 1);
 929
 930         free(param_in);
 931
 932         return retval;
 933 }
 934
 935 static int mips32_pracc_write_u32(struct mips_ejtag *ejtag_info, uint32_t addr, uint32_t *buf)
 936 {
 937         static const uint32_t code[] = {
 938                                                                                                                         /* start: */
 939                 MIPS32_MTC0(15, 31, 0),                                                         /* move $15 to COP0 DeSave */
 940                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)),            /* $15 = MIPS32_PRACC_STACK */
 941                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
 942                 MIPS32_SW(8, 0, 15),                                                            /* sw $8,($15) */
 943                 MIPS32_SW(9, 0, 15),                                                            /* sw $9,($15) */
 944
 945                 MIPS32_LW(8, NEG16((MIPS32_PRACC_STACK-MIPS32_PRACC_PARAM_IN)-4), 15),  /* load R8 @ param_in[1] = data */
 946                 MIPS32_LW(9, NEG16(MIPS32_PRACC_STACK-MIPS32_PRACC_PARAM_IN), 15),              /* load R9 @ param_in[0] = address */
 947
 948                 MIPS32_SW(8, 0, 9),                                                                     /* sw $8,0($9) */
 949
 950                 MIPS32_LW(9, 0, 15),                                                            /* lw $9,($15) */
 951                 MIPS32_LW(8, 0, 15),                                                            /* lw $8,($15) */
 952                 MIPS32_B(NEG16(11)),                                                            /* b start */
 953                 MIPS32_MFC0(15, 31, 0),                                                         /* move COP0 DeSave to $15 */
 954         };
 955
 956         /* TODO remove array */
 957         uint32_t param_in[1 + 1];
 958         param_in[0] = addr;
 959         param_in[1] = *buf;
 960
 961         return mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
 962                 ARRAY_SIZE(param_in), param_in, 0, NULL, 1);
 963 }
 964
 965 static int mips32_pracc_write_mem16(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint16_t *buf)
 966 {
 967         static const uint32_t code[] = {
 968                                                                                                                         /* start: */
 969                 MIPS32_MTC0(15, 31, 0),                                                         /* move $15 to COP0 DeSave */
 970                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)),            /* $15 = MIPS32_PRACC_STACK */
 971                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
 972                 MIPS32_SW(8, 0, 15),                                                            /* sw $8,($15) */
 973                 MIPS32_SW(9, 0, 15),                                                            /* sw $9,($15) */
 974                 MIPS32_SW(10, 0, 15),                                                           /* sw $10,($15) */
 975                 MIPS32_SW(11, 0, 15),                                                           /* sw $11,($15) */
 976
 977                 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)),          /* $8 = MIPS32_PRACC_PARAM_IN */
 978                 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
 979                 MIPS32_LW(9, 0, 8),                                                                     /* Load write addr to $9 */
 980                 MIPS32_LW(10, 4, 8),                                                            /* Load write count to $10 */
 981                 MIPS32_ADDI(8, 8, 8),                                                           /* $8 += 8 */
 982                                                                                                                         /* loop: */
 983                 MIPS32_BEQ(0, 10, 8),                                                           /* beq $0, $10, end */
 984                 MIPS32_NOP,
 985
 986                 MIPS32_LW(11, 0, 8),                                                            /* lw $11,0($8), Load $11 with the word @mem[$8] */
 987                 MIPS32_SH(11, 0, 9),                                                            /* sh $11,0($9) */
 988
 989                 MIPS32_ADDI(10, 10, NEG16(1)),                                          /* $10-- */
 990                 MIPS32_ADDI(9, 9, 2),                                                           /* $9 += 2 */
 991                 MIPS32_ADDI(8, 8, 4),                                                           /* $8 += 4 */
 992
 993                 MIPS32_B(NEG16(8)),                                                                     /* b loop */
 994                 MIPS32_NOP,
 995                                                                                                                         /* end: */
 996                 MIPS32_LW(11, 0, 15),                                                           /* lw $11,($15) */
 997                 MIPS32_LW(10, 0, 15),                                                           /* lw $10,($15) */
 998                 MIPS32_LW(9, 0, 15),                                                            /* lw $9,($15) */
 999                 MIPS32_LW(8, 0, 15),                                                            /* lw $8,($15) */
1000                 MIPS32_B(NEG16(26)),                                                            /* b start */
1001                 MIPS32_MFC0(15, 31, 0),                                                         /* move COP0 DeSave to $15 */
1002         };
1003
1004         /* TODO remove array */
1005         uint32_t *param_in = malloc((count + 2) * sizeof(uint32_t));
1006         int i;
1007         param_in[0] = addr;
1008         param_in[1] = count;
1009
1010         for (i = 0; i < count; i++)
1011                 param_in[i + 2] = buf[i];
1012
1013         int retval;
1014         retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
1015                 count + 2, param_in, 0, NULL, 1);
1016
1017         free(param_in);
1018
1019         return retval;
1020 }
1021
1022 static int mips32_pracc_write_mem8(struct mips_ejtag *ejtag_info, uint32_t addr, int count, uint8_t *buf)
1023 {
1024         static const uint32_t code[] = {
1025                                                                                                                         /* start: */
1026                 MIPS32_MTC0(15, 31, 0),                                                         /* move $15 to COP0 DeSave */
1027                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)),            /* $15 = MIPS32_PRACC_STACK */
1028                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
1029                 MIPS32_SW(8, 0, 15),                                                            /* sw $8,($15) */
1030                 MIPS32_SW(9, 0, 15),                                                            /* sw $9,($15) */
1031                 MIPS32_SW(10, 0, 15),                                                           /* sw $10,($15) */
1032                 MIPS32_SW(11, 0, 15),                                                           /* sw $11,($15) */
1033
1034                 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_PARAM_IN)),          /* $8 = MIPS32_PRACC_PARAM_IN */
1035                 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_PARAM_IN)),
1036                 MIPS32_LW(9, 0, 8),                                                                     /* Load write addr to $9 */
1037                 MIPS32_LW(10, 4, 8),                                                            /* Load write count to $10 */
1038                 MIPS32_ADDI(8, 8, 8),                                                           /* $8 += 8 */
1039                                                                                                                         /* loop: */
1040                 MIPS32_BEQ(0, 10, 8),                                                           /* beq $0, $10, end */
1041                 MIPS32_NOP,
1042
1043                 MIPS32_LW(11, 0, 8),                                                            /* lw $11,0($8), Load $11 with the word @mem[$8] */
1044                 MIPS32_SB(11, 0, 9),                                                            /* sb $11,0($9) */
1045
1046                 MIPS32_ADDI(10, 10, NEG16(1)),                                          /* $10-- */
1047                 MIPS32_ADDI(9, 9, 1),                                                           /* $9 += 1 */
1048                 MIPS32_ADDI(8, 8, 4),                                                           /* $8 += 4 */
1049
1050                 MIPS32_B(NEG16(8)),                                                                     /* b loop */
1051                 MIPS32_NOP,
1052                                                                                                                         /* end: */
1053                 MIPS32_LW(11, 0, 15),                                                           /* lw $11,($15) */
1054                 MIPS32_LW(10, 0, 15),                                                           /* lw $10,($15) */
1055                 MIPS32_LW(9, 0, 15),                                                            /* lw $9,($15) */
1056                 MIPS32_LW(8, 0, 15),                                                            /* lw $8,($15) */
1057                 MIPS32_B(NEG16(26)),                                                            /* b start */
1058                 MIPS32_MFC0(15, 31, 0),                                                         /* move COP0 DeSave to $15 */
1059         };
1060
1061         /* TODO remove array */
1062         uint32_t *param_in = malloc((count + 2) * sizeof(uint32_t));
1063         int retval;
1064         int i;
1065         param_in[0] = addr;
1066         param_in[1] = count;
1067
1068         for (i = 0; i < count; i++)
1069                 param_in[i + 2] = buf[i];
1070
1071         retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
1072                 count + 2, param_in, 0, NULL, 1);
1073
1074         free(param_in);
1075
1076         return retval;
1077 }
1078
1079 int mips32_pracc_write_regs(struct mips_ejtag *ejtag_info, uint32_t *regs)
1080 {
1081         static const uint32_t code[] = {
1082                                                                                                                 /* start: */
1083                 MIPS32_LUI(2, UPPER16(MIPS32_PRACC_PARAM_IN)),  /* $2 = MIPS32_PRACC_PARAM_IN */
1084                 MIPS32_ORI(2, 2, LOWER16(MIPS32_PRACC_PARAM_IN)),
1085                 MIPS32_LW(1, 1*4, 2),                                                   /* lw $1,1*4($2) */
1086                 MIPS32_LW(15, 15*4, 2),                                                 /* lw $15,15*4($2) */
1087                 MIPS32_MTC0(15, 31, 0),                                                 /* move $15 to COP0 DeSave */
1088                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)),    /* $15 = MIPS32_PRACC_STACK */
1089                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
1090                 MIPS32_SW(1, 0, 15),                                                    /* sw $1,($15) */
1091                 MIPS32_LUI(1, UPPER16(MIPS32_PRACC_PARAM_IN)),  /* $1 = MIPS32_PRACC_PARAM_IN */
1092                 MIPS32_ORI(1, 1, LOWER16(MIPS32_PRACC_PARAM_IN)),
1093                 MIPS32_LW(3, 3*4, 1),                                                   /* lw $3,3*4($1) */
1094                 MIPS32_LW(4, 4*4, 1),                                                   /* lw $4,4*4($1) */
1095                 MIPS32_LW(5, 5*4, 1),                                                   /* lw $5,5*4($1) */
1096                 MIPS32_LW(6, 6*4, 1),                                                   /* lw $6,6*4($1) */
1097                 MIPS32_LW(7, 7*4, 1),                                                   /* lw $7,7*4($1) */
1098                 MIPS32_LW(8, 8*4, 1),                                                   /* lw $8,8*4($1) */
1099                 MIPS32_LW(9, 9*4, 1),                                                   /* lw $9,9*4($1) */
1100                 MIPS32_LW(10, 10*4, 1),                                                 /* lw $10,10*4($1) */
1101                 MIPS32_LW(11, 11*4, 1),                                                 /* lw $11,11*4($1) */
1102                 MIPS32_LW(12, 12*4, 1),                                                 /* lw $12,12*4($1) */
1103                 MIPS32_LW(13, 13*4, 1),                                                 /* lw $13,13*4($1) */
1104                 MIPS32_LW(14, 14*4, 1),                                                 /* lw $14,14*4($1) */
1105                 MIPS32_LW(16, 16*4, 1),                                                 /* lw $16,16*4($1) */
1106                 MIPS32_LW(17, 17*4, 1),                                                 /* lw $17,17*4($1) */
1107                 MIPS32_LW(18, 18*4, 1),                                                 /* lw $18,18*4($1) */
1108                 MIPS32_LW(19, 19*4, 1),                                                 /* lw $19,19*4($1) */
1109                 MIPS32_LW(20, 20*4, 1),                                                 /* lw $20,20*4($1) */
1110                 MIPS32_LW(21, 21*4, 1),                                                 /* lw $21,21*4($1) */
1111                 MIPS32_LW(22, 22*4, 1),                                                 /* lw $22,22*4($1) */
1112                 MIPS32_LW(23, 23*4, 1),                                                 /* lw $23,23*4($1) */
1113                 MIPS32_LW(24, 24*4, 1),                                                 /* lw $24,24*4($1) */
1114                 MIPS32_LW(25, 25*4, 1),                                                 /* lw $25,25*4($1) */
1115                 MIPS32_LW(26, 26*4, 1),                                                 /* lw $26,26*4($1) */
1116                 MIPS32_LW(27, 27*4, 1),                                                 /* lw $27,27*4($1) */
1117                 MIPS32_LW(28, 28*4, 1),                                                 /* lw $28,28*4($1) */
1118                 MIPS32_LW(29, 29*4, 1),                                                 /* lw $29,29*4($1) */
1119                 MIPS32_LW(30, 30*4, 1),                                                 /* lw $30,30*4($1) */
1120                 MIPS32_LW(31, 31*4, 1),                                                 /* lw $31,31*4($1) */
1121
1122                 MIPS32_LW(2, 32*4, 1),                                                  /* lw $2,32*4($1) */
1123                 MIPS32_MTC0(2, 12, 0),                                                  /* move $2 to status */
1124                 MIPS32_LW(2, 33*4, 1),                                                  /* lw $2,33*4($1) */
1125                 MIPS32_MTLO(2),                                                                 /* move $2 to lo */
1126                 MIPS32_LW(2, 34*4, 1),                                                  /* lw $2,34*4($1) */
1127                 MIPS32_MTHI(2),                                                                 /* move $2 to hi */
1128                 MIPS32_LW(2, 35*4, 1),                                                  /* lw $2,35*4($1) */
1129                 MIPS32_MTC0(2, 8, 0),                                                   /* move $2 to badvaddr */
1130                 MIPS32_LW(2, 36*4, 1),                                                  /* lw $2,36*4($1) */
1131                 MIPS32_MTC0(2, 13, 0),                                                  /* move $2 to cause*/
1132                 MIPS32_LW(2, 37*4, 1),                                                  /* lw $2,37*4($1) */
1133                 MIPS32_MTC0(2, 24, 0),                                                  /* move $2 to depc (pc) */
1134
1135                 MIPS32_LW(2, 2*4, 1),                                                   /* lw $2,2*4($1) */
1136                 MIPS32_LW(1, 0, 15),                                                    /* lw $1,($15) */
1137                 MIPS32_B(NEG16(53)),                                                    /* b start */
1138                 MIPS32_MFC0(15, 31, 0),                                                 /* move COP0 DeSave to $15 */
1139         };
1140
1141         int retval;
1142
1143         retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
1144                         MIPS32NUMCOREREGS, regs, 0, NULL, 1);
1145
1146         return retval;
1147 }
1148
1149 int mips32_pracc_read_regs(struct mips_ejtag *ejtag_info, uint32_t *regs)
1150 {
1151         static const uint32_t code[] = {
1152                                                                                                                 /* start: */
1153                 MIPS32_MTC0(2, 31, 0),                                                  /* move $2 to COP0 DeSave */
1154                 MIPS32_LUI(2, UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $2 = MIPS32_PRACC_PARAM_OUT */
1155                 MIPS32_ORI(2, 2, LOWER16(MIPS32_PRACC_PARAM_OUT)),
1156                 MIPS32_SW(0, 0*4, 2),                                                   /* sw $0,0*4($2) */
1157                 MIPS32_SW(1, 1*4, 2),                                                   /* sw $1,1*4($2) */
1158                 MIPS32_SW(15, 15*4, 2),                                                 /* sw $15,15*4($2) */
1159                 MIPS32_MFC0(2, 31, 0),                                                  /* move COP0 DeSave to $2 */
1160                 MIPS32_MTC0(15, 31, 0),                                                 /* move $15 to COP0 DeSave */
1161                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_STACK)),    /* $15 = MIPS32_PRACC_STACK */
1162                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_STACK)),
1163                 MIPS32_SW(1, 0, 15),                                                    /* sw $1,($15) */
1164                 MIPS32_SW(2, 0, 15),                                                    /* sw $2,($15) */
1165                 MIPS32_LUI(1, UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $1 = MIPS32_PRACC_PARAM_OUT */
1166                 MIPS32_ORI(1, 1, LOWER16(MIPS32_PRACC_PARAM_OUT)),
1167                 MIPS32_SW(2, 2*4, 1),                                                   /* sw $2,2*4($1) */
1168                 MIPS32_SW(3, 3*4, 1),                                                   /* sw $3,3*4($1) */
1169                 MIPS32_SW(4, 4*4, 1),                                                   /* sw $4,4*4($1) */
1170                 MIPS32_SW(5, 5*4, 1),                                                   /* sw $5,5*4($1) */
1171                 MIPS32_SW(6, 6*4, 1),                                                   /* sw $6,6*4($1) */
1172                 MIPS32_SW(7, 7*4, 1),                                                   /* sw $7,7*4($1) */
1173                 MIPS32_SW(8, 8*4, 1),                                                   /* sw $8,8*4($1) */
1174                 MIPS32_SW(9, 9*4, 1),                                                   /* sw $9,9*4($1) */
1175                 MIPS32_SW(10, 10*4, 1),                                                 /* sw $10,10*4($1) */
1176                 MIPS32_SW(11, 11*4, 1),                                                 /* sw $11,11*4($1) */
1177                 MIPS32_SW(12, 12*4, 1),                                                 /* sw $12,12*4($1) */
1178                 MIPS32_SW(13, 13*4, 1),                                                 /* sw $13,13*4($1) */
1179                 MIPS32_SW(14, 14*4, 1),                                                 /* sw $14,14*4($1) */
1180                 MIPS32_SW(16, 16*4, 1),                                                 /* sw $16,16*4($1) */
1181                 MIPS32_SW(17, 17*4, 1),                                                 /* sw $17,17*4($1) */
1182                 MIPS32_SW(18, 18*4, 1),                                                 /* sw $18,18*4($1) */
1183                 MIPS32_SW(19, 19*4, 1),                                                 /* sw $19,19*4($1) */
1184                 MIPS32_SW(20, 20*4, 1),                                                 /* sw $20,20*4($1) */
1185                 MIPS32_SW(21, 21*4, 1),                                                 /* sw $21,21*4($1) */
1186                 MIPS32_SW(22, 22*4, 1),                                                 /* sw $22,22*4($1) */
1187                 MIPS32_SW(23, 23*4, 1),                                                 /* sw $23,23*4($1) */
1188                 MIPS32_SW(24, 24*4, 1),                                                 /* sw $24,24*4($1) */
1189                 MIPS32_SW(25, 25*4, 1),                                                 /* sw $25,25*4($1) */
1190                 MIPS32_SW(26, 26*4, 1),                                                 /* sw $26,26*4($1) */
1191                 MIPS32_SW(27, 27*4, 1),                                                 /* sw $27,27*4($1) */
1192                 MIPS32_SW(28, 28*4, 1),                                                 /* sw $28,28*4($1) */
1193                 MIPS32_SW(29, 29*4, 1),                                                 /* sw $29,29*4($1) */
1194                 MIPS32_SW(30, 30*4, 1),                                                 /* sw $30,30*4($1) */
1195                 MIPS32_SW(31, 31*4, 1),                                                 /* sw $31,31*4($1) */
1196
1197                 MIPS32_MFC0(2, 12, 0),                                                  /* move status to $2 */
1198                 MIPS32_SW(2, 32*4, 1),                                                  /* sw $2,32*4($1) */
1199                 MIPS32_MFLO(2),                                                                 /* move lo to $2 */
1200                 MIPS32_SW(2, 33*4, 1),                                                  /* sw $2,33*4($1) */
1201                 MIPS32_MFHI(2),                                                                 /* move hi to $2 */
1202                 MIPS32_SW(2, 34*4, 1),                                                  /* sw $2,34*4($1) */
1203                 MIPS32_MFC0(2, 8, 0),                                                   /* move badvaddr to $2 */
1204                 MIPS32_SW(2, 35*4, 1),                                                  /* sw $2,35*4($1) */
1205                 MIPS32_MFC0(2, 13, 0),                                                  /* move cause to $2 */
1206                 MIPS32_SW(2, 36*4, 1),                                                  /* sw $2,36*4($1) */
1207                 MIPS32_MFC0(2, 24, 0),                                                  /* move depc (pc) to $2 */
1208                 MIPS32_SW(2, 37*4, 1),                                                  /* sw $2,37*4($1) */
1209
1210                 MIPS32_LW(2, 0, 15),                                                    /* lw $2,($15) */
1211                 MIPS32_LW(1, 0, 15),                                                    /* lw $1,($15) */
1212                 MIPS32_B(NEG16(58)),                                                    /* b start */
1213                 MIPS32_MFC0(15, 31, 0),                                                 /* move COP0 DeSave to $15 */
1214         };
1215
1216         int retval;
1217
1218         retval = mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code,
1219                 0, NULL, MIPS32NUMCOREREGS, regs, 1);
1220
1221         return retval;
1222 }
1223
1224 /* fastdata upload/download requires an initialized working area
1225  * to load the download code; it should not be called otherwise
1226  * fetch order from the fastdata area
1227  * 1. start addr
1228  * 2. end addr
1229  * 3. data ...
1230  */
1231 int mips32_pracc_fastdata_xfer(struct mips_ejtag *ejtag_info, struct working_area *source,
1232                 int write_t, uint32_t addr, int count, uint32_t *buf)
1233 {
1234         uint32_t handler_code[] = {
1235                 /* caution when editing, table is modified below */
1236                 /* r15 points to the start of this code */
1237                 MIPS32_SW(8, MIPS32_FASTDATA_HANDLER_SIZE - 4, 15),
1238                 MIPS32_SW(9, MIPS32_FASTDATA_HANDLER_SIZE - 8, 15),
1239                 MIPS32_SW(10, MIPS32_FASTDATA_HANDLER_SIZE - 12, 15),
1240                 MIPS32_SW(11, MIPS32_FASTDATA_HANDLER_SIZE - 16, 15),
1241                 /* start of fastdata area in t0 */
1242                 MIPS32_LUI(8, UPPER16(MIPS32_PRACC_FASTDATA_AREA)),
1243                 MIPS32_ORI(8, 8, LOWER16(MIPS32_PRACC_FASTDATA_AREA)),
1244                 MIPS32_LW(9, 0, 8),                                                             /* start addr in t1 */
1245                 MIPS32_LW(10, 0, 8),                                                    /* end addr to t2 */
1246                                                                                                                 /* loop: */
1247                 /* 8 */ MIPS32_LW(11, 0, 0),                                    /* lw t3,[t8 | r9] */
1248                 /* 9 */ MIPS32_SW(11, 0, 0),                                    /* sw t3,[r9 | r8] */
1249                 MIPS32_BNE(10, 9, NEG16(3)),                                    /* bne $t2,t1,loop */
1250                 MIPS32_ADDI(9, 9, 4),                                                   /* addi t1,t1,4 */
1251
1252                 MIPS32_LW(8, MIPS32_FASTDATA_HANDLER_SIZE - 4, 15),
1253                 MIPS32_LW(9, MIPS32_FASTDATA_HANDLER_SIZE - 8, 15),
1254                 MIPS32_LW(10, MIPS32_FASTDATA_HANDLER_SIZE - 12, 15),
1255                 MIPS32_LW(11, MIPS32_FASTDATA_HANDLER_SIZE - 16, 15),
1256
1257                 MIPS32_LUI(15, UPPER16(MIPS32_PRACC_TEXT)),
1258                 MIPS32_ORI(15, 15, LOWER16(MIPS32_PRACC_TEXT)),
1259                 MIPS32_JR(15),                                                          /* jr start */
1260                 MIPS32_MFC0(15, 31, 0),                                         /* move COP0 DeSave to $15 */
1261         };
1262
1263         uint32_t jmp_code[] = {
1264                 MIPS32_MTC0(15, 31, 0),                 /* move $15 to COP0 DeSave */
1265                 /* 1 */ MIPS32_LUI(15, 0),              /* addr of working area added below */
1266                 /* 2 */ MIPS32_ORI(15, 15, 0),  /* addr of working area added below */
1267                 MIPS32_JR(15),                                  /* jump to ram program */
1268                 MIPS32_NOP,
1269         };
1270
1271         int retval, i;
1272         uint32_t val, ejtag_ctrl, address;
1273
1274         if (source->size < MIPS32_FASTDATA_HANDLER_SIZE)
1275                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1276
1277         if (write_t) {
1278                 handler_code[8] = MIPS32_LW(11, 0, 8);  /* load data from probe at fastdata area */
1279                 handler_code[9] = MIPS32_SW(11, 0, 9);  /* store data to RAM @ r9 */
1280         } else {
1281                 handler_code[8] = MIPS32_LW(11, 0, 9);  /* load data from RAM @ r9 */
1282                 handler_code[9] = MIPS32_SW(11, 0, 8);  /* store data to probe at fastdata area */
1283         }
1284
1285         /* write program into RAM */
1286         if (write_t != ejtag_info->fast_access_save) {
1287                 mips32_pracc_write_mem32(ejtag_info, source->address, ARRAY_SIZE(handler_code), handler_code);
1288                 /* save previous operation to speed to any consecutive read/writes */
1289                 ejtag_info->fast_access_save = write_t;
1290         }
1291
1292         LOG_DEBUG("%s using 0x%.8" PRIx32 " for write handler", __func__, source->address);
1293
1294         jmp_code[1] |= UPPER16(source->address);
1295         jmp_code[2] |= LOWER16(source->address);
1296
1297         for (i = 0; i < (int) ARRAY_SIZE(jmp_code); i++) {
1298                 retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl);
1299                 if (retval != ERROR_OK)
1300                         return retval;
1301
1302                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA);
1303                 mips_ejtag_drscan_32_out(ejtag_info, jmp_code[i]);
1304
1305                 /* Clear the access pending bit (let the processor eat!) */
1306                 ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_PRACC;
1307                 mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
1308                 mips_ejtag_drscan_32_out(ejtag_info, ejtag_ctrl);
1309         }
1310
1311         retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl);
1312         if (retval != ERROR_OK)
1313                 return retval;
1314
1315         /* next fetch to dmseg should be in FASTDATA_AREA, check */
1316         address = 0;
1317         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS);
1318         retval = mips_ejtag_drscan_32(ejtag_info, &address);
1319         if (retval != ERROR_OK)
1320                 return retval;
1321
1322         if (address != MIPS32_PRACC_FASTDATA_AREA)
1323                 return ERROR_FAIL;
1324
1325         /* wait PrAcc pending bit for FASTDATA write */
1326         retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl);
1327         if (retval != ERROR_OK)
1328                 return retval;
1329
1330         /* Send the load start address */
1331         val = addr;
1332         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_FASTDATA);
1333         mips_ejtag_fastdata_scan(ejtag_info, 1, &val);
1334
1335         /* Send the load end address */
1336         val = addr + (count - 1) * 4;
1337         mips_ejtag_fastdata_scan(ejtag_info, 1, &val);
1338
1339         for (i = 0; i < count; i++) {
1340                 retval = mips_ejtag_fastdata_scan(ejtag_info, write_t, buf++);
1341                 if (retval != ERROR_OK)
1342                         return retval;
1343         }
1344
1345         retval = jtag_execute_queue();
1346         if (retval != ERROR_OK) {
1347                 LOG_ERROR("fastdata load failed");
1348                 return retval;
1349         }
1350
1351         retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl);
1352         if (retval != ERROR_OK)
1353                 return retval;
1354
1355         address = 0;
1356         mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS);
1357         retval = mips_ejtag_drscan_32(ejtag_info, &address);
1358         if (retval != ERROR_OK)
1359                 return retval;
1360
1361         if (address != MIPS32_PRACC_TEXT)
1362                 LOG_ERROR("mini program did not return to start");
1363
1364         return retval;
1365 }