[622] | 1 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 2 | // File : stdio.c |
---|
| 3 | // Written by Alain Greiner |
---|
| 4 | // Date : janvier 2014 |
---|
| 5 | // |
---|
[629] | 6 | // This file defines various functions that can be used by applications to access |
---|
[622] | 7 | // peripherals, for the TSAR multi-processors multi_clusters architecture. |
---|
| 8 | // There is NO separation between application code and system code, as the |
---|
| 9 | // application are running in kernel mode without system calls. |
---|
| 10 | // This basic GIET does not support virtual memory, and does not support multi-tasking. |
---|
| 11 | // |
---|
| 12 | // The supported peripherals are: |
---|
| 13 | // - the SoClib multi_tty |
---|
| 14 | // - The SoCLib frame_buffer |
---|
| 15 | // - The SoCLib block_device |
---|
| 16 | // |
---|
| 17 | // The following parameters must be defined in the hard_config.h file. |
---|
| 18 | // - X_SIZE : number of clusters in a row |
---|
| 19 | // - Y_SIZE : number of clusters in a column |
---|
| 20 | // - X_WIDTH : number of bits for X field in proc_id |
---|
| 21 | // - Y_WIDTH : number of bits for Y field in proc_id |
---|
| 22 | // - NB_PROCS_MAX : max number of processor per cluster |
---|
| 23 | // - NB_TTY_CHANNELS : max number of TTY channels |
---|
[629] | 24 | // - USE_EXT_IO : use external peripherals if not zero |
---|
[622] | 25 | // |
---|
| 26 | // The follobing base addresses must be defined in the ldscript |
---|
| 27 | // - seg_tty_base |
---|
| 28 | // - seg_fbf_base |
---|
| 29 | // - seg_ioc_base |
---|
| 30 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
[158] | 31 | |
---|
[622] | 32 | #include "stdio.h" |
---|
[158] | 33 | |
---|
[629] | 34 | #if !defined(NB_PROCS_MAX) |
---|
| 35 | #error: you must define NB_PROCS_MAX in the hard_config.h file |
---|
| 36 | #endif |
---|
| 37 | |
---|
| 38 | #if !defined(USE_EXT_IO) |
---|
| 39 | #error: you must define USE_EXT_IO in the hard_config.h file |
---|
| 40 | #endif |
---|
| 41 | |
---|
| 42 | #if !defined(X_SIZE) |
---|
| 43 | #error: you must define X_SIZE in the hard_config.h file |
---|
| 44 | #endif |
---|
| 45 | |
---|
| 46 | #if !defined(Y_SIZE) |
---|
| 47 | #error: you must define Y_SIZE in the hard_config.h file |
---|
| 48 | #endif |
---|
| 49 | |
---|
| 50 | #if !defined(X_WIDTH) |
---|
| 51 | #error: you must define X_WIDTH in the hard_config.h file |
---|
| 52 | #endif |
---|
| 53 | |
---|
| 54 | #if (X_WIDTH != 4) |
---|
| 55 | #error: The X_WIDTH parameter must be equal to 4 |
---|
| 56 | #endif |
---|
| 57 | |
---|
| 58 | #if !defined(Y_WIDTH) |
---|
| 59 | #error: you must define X_WIDTH in the hard_config.h file |
---|
| 60 | #endif |
---|
| 61 | |
---|
| 62 | #if (X_WIDTH != 4) |
---|
| 63 | #error: The Y_WIDTH parameter must be equal to 4 |
---|
| 64 | #endif |
---|
| 65 | |
---|
| 66 | #if !defined(NB_TTY_CHANNELS) |
---|
| 67 | #error: you must define NB_TTY_CHANNELS in the hard_config.h file |
---|
| 68 | #endif |
---|
| 69 | |
---|
| 70 | |
---|
| 71 | |
---|
| 72 | |
---|
[622] | 73 | #define NB_LOCKS 256 |
---|
| 74 | #define NB_BARRIERS 16 |
---|
[158] | 75 | |
---|
[622] | 76 | #define in_drivers __attribute__((section (".drivers"))) |
---|
| 77 | #define in_unckdata __attribute__((section (".unckdata"))) |
---|
[158] | 78 | |
---|
[622] | 79 | ////////////////////////////////////////////////////////////// |
---|
| 80 | // various informations that must be defined in ldscript |
---|
| 81 | ////////////////////////////////////////////////////////////// |
---|
[158] | 82 | |
---|
[622] | 83 | struct plouf; |
---|
| 84 | |
---|
| 85 | extern struct plouf seg_tty_base; |
---|
| 86 | extern struct plouf seg_fbf_base; |
---|
| 87 | extern struct plouf seg_ioc_base; |
---|
| 88 | extern struct plouf seg_mmc_base; |
---|
| 89 | |
---|
| 90 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 91 | // Global uncachable variables for synchronization between drivers and ISRs |
---|
| 92 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 93 | |
---|
| 94 | in_unckdata int volatile _ioc_lock = 0; |
---|
| 95 | in_unckdata int volatile _ioc_done = 0; |
---|
| 96 | in_unckdata int volatile _ioc_status; |
---|
| 97 | |
---|
| 98 | in_unckdata char volatile _tty_get_buf[NB_TTY_CHANNELS]; |
---|
| 99 | in_unckdata int volatile _tty_get_full[NB_TTY_CHANNELS] = { [0 ... NB_TTY_CHANNELS-1] = 0 }; |
---|
| 100 | |
---|
| 101 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 102 | // Global uncachable variables for inter-task barriers |
---|
| 103 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 104 | |
---|
| 105 | in_unckdata int volatile _barrier_value[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
---|
| 106 | in_unckdata int volatile _barrier_count[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
---|
| 107 | in_unckdata int volatile _barrier_lock[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
---|
| 108 | |
---|
| 109 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 110 | // Global uncachable variables for spin_locks using LL/C instructions |
---|
| 111 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 112 | |
---|
| 113 | in_unckdata int volatile _spin_lock[NB_LOCKS] = { [0 ... NB_LOCKS-1] = 0 }; |
---|
| 114 | |
---|
| 115 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 116 | // Memcopy taken from MutekH. |
---|
[622] | 117 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 118 | in_drivers void* _memcpy( void* _dst, |
---|
| 119 | const void* _src, |
---|
| 120 | unsigned int size ) |
---|
[158] | 121 | { |
---|
[622] | 122 | unsigned int *dst = _dst; |
---|
| 123 | const unsigned int *src = _src; |
---|
| 124 | if ( ! ((unsigned int)dst & 3) && ! ((unsigned int)src & 3) ) |
---|
| 125 | { |
---|
| 126 | while (size > 3) |
---|
| 127 | { |
---|
| 128 | *dst++ = *src++; |
---|
| 129 | size -= 4; |
---|
| 130 | } |
---|
| 131 | } |
---|
[158] | 132 | |
---|
[622] | 133 | unsigned char *cdst = (unsigned char*)dst; |
---|
| 134 | unsigned char *csrc = (unsigned char*)src; |
---|
| 135 | |
---|
| 136 | while (size--) |
---|
| 137 | { |
---|
| 138 | *cdst++ = *csrc++; |
---|
| 139 | } |
---|
| 140 | return _dst; |
---|
[158] | 141 | } |
---|
[629] | 142 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 143 | // Memcopy using extended addresses |
---|
| 144 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 145 | in_drivers void _extended_memcpy( unsigned int dst_cluster, |
---|
| 146 | unsigned int dst_address, |
---|
| 147 | unsigned int src_cluster, |
---|
| 148 | unsigned int src_address, |
---|
| 149 | unsigned int length ) |
---|
| 150 | { |
---|
| 151 | if ( (dst_address & 0x3) || (src_address & 0x3) || (length & 0x3) ) |
---|
| 152 | { |
---|
| 153 | _tty_get_lock( 0 ); |
---|
| 154 | _tty_puts( "ERROR in _extended_memcpy()" ); |
---|
| 155 | _tty_release_lock( 0 ); |
---|
| 156 | _exit(); |
---|
| 157 | } |
---|
[158] | 158 | |
---|
[629] | 159 | unsigned int i; |
---|
| 160 | unsigned int word; |
---|
| 161 | |
---|
| 162 | for ( i = 0 ; i < length ; i = i+4 ) |
---|
| 163 | { |
---|
| 164 | word = _word_extended_read( src_cluster, (src_address + i) ); |
---|
| 165 | _word_extended_write( dst_cluster, (dst_address + i), word ); |
---|
| 166 | } |
---|
| 167 | } |
---|
[622] | 168 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 169 | // Access CP0 and returns processor ident |
---|
| 170 | // No more than 1024 processors... |
---|
| 171 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 172 | in_drivers unsigned int _procid() |
---|
[158] | 173 | { |
---|
[622] | 174 | unsigned int ret; |
---|
| 175 | asm volatile( "mfc0 %0, $15, 1": "=r"(ret) ); |
---|
| 176 | return (ret & 0x3FF); |
---|
[158] | 177 | } |
---|
[622] | 178 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 179 | // Access CP0 and returns processor time |
---|
| 180 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 181 | in_drivers unsigned int _proctime() |
---|
[158] | 182 | { |
---|
[622] | 183 | unsigned int ret; |
---|
| 184 | asm volatile( "mfc0 %0, $9": "=r"(ret) ); |
---|
| 185 | return ret; |
---|
[158] | 186 | } |
---|
[622] | 187 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 188 | // Returns the number of processsors controled by the GIET |
---|
| 189 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 190 | in_drivers unsigned int _procnumber() |
---|
[158] | 191 | { |
---|
[622] | 192 | return (unsigned int)(NB_PROCS_MAX * X_SIZE * Y_SIZE); |
---|
[158] | 193 | } |
---|
[622] | 194 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
[626] | 195 | // Returns pseudo-random number |
---|
| 196 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 197 | in_drivers unsigned int _rand() |
---|
| 198 | { |
---|
| 199 | unsigned int x = _proctime(); |
---|
| 200 | if((x & 0xF) > 7) |
---|
| 201 | return (x*x & 0xFFFF); |
---|
| 202 | else |
---|
| 203 | return (x*x*x & 0xFFFF); |
---|
| 204 | } |
---|
| 205 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
[622] | 206 | // Access CP0 and mask IRQs |
---|
| 207 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 208 | in_drivers void _it_mask() |
---|
[158] | 209 | { |
---|
[622] | 210 | int tmp; |
---|
| 211 | asm volatile("mfc0 %0, $12" : "=r" (tmp) ); |
---|
| 212 | asm volatile("ori %0, %0, 1" : "=r" (tmp) ); |
---|
| 213 | asm volatile("mtc0 %0, $12" : "=r" (tmp) ); |
---|
[158] | 214 | } |
---|
[622] | 215 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 216 | // Access CP0 and enable IRQs |
---|
| 217 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
| 218 | in_drivers void _it_enable() |
---|
[158] | 219 | { |
---|
[622] | 220 | int tmp; |
---|
| 221 | asm volatile("mfc0 %0, $12" : "=r" (tmp) ); |
---|
| 222 | asm volatile("addi %0, %0, -1" : "=r" (tmp) ); |
---|
| 223 | asm volatile("mtc0 %0, $12" : "=r" (tmp) ); |
---|
[158] | 224 | } |
---|
[622] | 225 | ////////////////////////////////////////////////////////////////////// |
---|
| 226 | // Invalidate all cache lines corresponding to a memory buffer. |
---|
| 227 | // This is used by the block_device driver. |
---|
| 228 | ///////////////////////////////////////////////////////////////////////// |
---|
| 229 | in_drivers void _dcache_buf_invalidate(const void * buffer, size_t size) |
---|
| 230 | { |
---|
| 231 | size_t i; |
---|
| 232 | size_t dcache_line_size; |
---|
[158] | 233 | |
---|
[622] | 234 | // retrieve dcache line size from config register (bits 12:10) |
---|
| 235 | asm volatile("mfc0 %0, $16, 1" : "=r" (dcache_line_size)); |
---|
| 236 | |
---|
| 237 | dcache_line_size = 2 << ((dcache_line_size>>10) & 0x7); |
---|
| 238 | |
---|
| 239 | // iterate on lines to invalidate each one of them |
---|
| 240 | for ( i=0; i<size; i+=dcache_line_size ) |
---|
| 241 | asm volatile(" cache %0, %1" |
---|
| 242 | : |
---|
| 243 | :"i" (0x11), "R" (*((char*)buffer+i))); |
---|
| 244 | } |
---|
| 245 | |
---|
[629] | 246 | //////////////////////////////////////////////////////////////////////////// |
---|
| 247 | // This function makes a physical read access to a 32 bits word in memory, |
---|
| 248 | // after a temporary paddr extension. |
---|
| 249 | //////////////////////////////////////////////////////////////////////////// |
---|
| 250 | in_drivers unsigned int _word_extended_read( unsigned int cluster, |
---|
| 251 | unsigned int address ) |
---|
| 252 | { |
---|
| 253 | unsigned int value; |
---|
| 254 | asm volatile( |
---|
| 255 | "li $3, 0xFFFFFFFE \n" |
---|
| 256 | "mfc0 $2, $12 \n" |
---|
| 257 | "and $3, $2, $3 \n" |
---|
| 258 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
---|
| 259 | |
---|
| 260 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
---|
| 261 | "lw %0, 0(%1) \n" /* value <= *paddr */ |
---|
| 262 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
---|
| 263 | |
---|
| 264 | "li $3, 0x00000001 \n" |
---|
| 265 | "mfc0 $2, $12 \n" |
---|
| 266 | "or $3, $3, $2 \n" |
---|
| 267 | "mtc0 $3, $12 \n" /* IRQ enabled */ |
---|
| 268 | : "=r" (value) |
---|
| 269 | : "r" (address), "r" (cluster) |
---|
| 270 | : "$2", "$3" ); |
---|
| 271 | return value; |
---|
| 272 | } |
---|
| 273 | //////////////////////////////////////////////////////////////////////////// |
---|
| 274 | // This function makes a physical read access to a single byte in memory, |
---|
| 275 | // after a temporary paddr extension. |
---|
| 276 | //////////////////////////////////////////////////////////////////////////// |
---|
| 277 | in_drivers unsigned char _byte_extended_read( unsigned int cluster, |
---|
| 278 | unsigned int address ) |
---|
| 279 | { |
---|
| 280 | unsigned int value; |
---|
| 281 | asm volatile( |
---|
| 282 | "li $3, 0xFFFFFFFE \n" |
---|
| 283 | "mfc0 $2, $12 \n" |
---|
| 284 | "and $3, $2, $3 \n" |
---|
| 285 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
---|
| 286 | |
---|
| 287 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
---|
| 288 | "lb %0, 0(%1) \n" /* value <= *paddr */ |
---|
| 289 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
---|
| 290 | |
---|
| 291 | "li $3, 0x00000001 \n" |
---|
| 292 | "mfc0 $2, $12 \n" |
---|
| 293 | "or $3, $3, $2 \n" |
---|
| 294 | "mtc0 $3, $12 \n" /* IRQ enabled */ |
---|
| 295 | : "=r" (value) |
---|
| 296 | : "r" (address), "r" (cluster) |
---|
| 297 | : "$2", "$3" ); |
---|
| 298 | return (unsigned char)value; |
---|
| 299 | } |
---|
| 300 | //////////////////////////////////////////////////////////////////////////// |
---|
| 301 | // This function makes a physical write access to a 32 bits word in memory, |
---|
| 302 | // after a temporary DTLB address extension. |
---|
| 303 | //////////////////////////////////////////////////////////////////////////// |
---|
| 304 | in_drivers void _word_extended_write( unsigned int cluster, |
---|
| 305 | unsigned int address, |
---|
| 306 | unsigned int word ) |
---|
| 307 | { |
---|
| 308 | asm volatile( |
---|
| 309 | "li $3, 0xFFFFFFFE \n" |
---|
| 310 | "mfc0 $2, $12 \n" |
---|
| 311 | "and $3, $2, $3 \n" |
---|
| 312 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
---|
| 313 | |
---|
| 314 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
---|
| 315 | "sw %0, 0(%1) \n" /* *paddr <= value */ |
---|
| 316 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
---|
| 317 | |
---|
| 318 | "li $3, 0x00000001 \n" |
---|
| 319 | "mfc0 $2, $12 \n" |
---|
| 320 | "or $3, $2, $3 \n" |
---|
| 321 | "mtc0 $3, $12 \n" /* IRQ enabled */ |
---|
| 322 | : |
---|
| 323 | : "r" (word), "r" (address), "r" (cluster) |
---|
| 324 | : "$2", "$3"); |
---|
| 325 | } |
---|
| 326 | //////////////////////////////////////////////////////////////////////////// |
---|
| 327 | // This function makes a physical write access to single byte in memory, |
---|
| 328 | // after a temporary DTLB de-activation and address extension. |
---|
| 329 | //////////////////////////////////////////////////////////////////////////// |
---|
| 330 | in_drivers void _byte_extended_write( unsigned int cluster, |
---|
| 331 | unsigned int address, |
---|
| 332 | unsigned char byte ) |
---|
| 333 | { |
---|
| 334 | asm volatile( |
---|
| 335 | "li $3, 0xFFFFFFFE \n" |
---|
| 336 | "mfc0 $2, $12 \n" |
---|
| 337 | "and $3, $2, $3 \n" |
---|
| 338 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
---|
| 339 | |
---|
| 340 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
---|
| 341 | "sb %0, 0(%1) \n" /* *paddr <= value */ |
---|
| 342 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
---|
| 343 | |
---|
| 344 | "li $3, 0x00000001 \n" |
---|
| 345 | "mfc0 $2, $12 \n" |
---|
| 346 | "or $3, $2, $3 \n" |
---|
| 347 | "mtc0 $3, $12 \n" /* IRQ enabled */ |
---|
| 348 | : |
---|
| 349 | : "r" (byte), "r" (address), "r" (cluster) |
---|
| 350 | : "$2", "$3"); |
---|
| 351 | } |
---|
| 352 | |
---|
[622] | 353 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 354 | // Exit (suicide) after printing message on TTY0 |
---|
[622] | 355 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 356 | in_drivers void _exit() |
---|
[158] | 357 | { |
---|
[622] | 358 | unsigned int proc_id = _procid(); |
---|
| 359 | unsigned int l = proc_id % NB_PROCS_MAX; |
---|
| 360 | unsigned int x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
---|
| 361 | unsigned int y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
---|
| 362 | |
---|
[629] | 363 | _tty_get_lock( 0 ); |
---|
| 364 | _tty_puts("\n !!! exit proc["); |
---|
| 365 | _tty_putd( x ); |
---|
| 366 | _tty_puts(","); |
---|
| 367 | _tty_putd( y ); |
---|
| 368 | _tty_puts(","); |
---|
| 369 | _tty_putd( l ); |
---|
| 370 | _tty_puts("] !!!\n"); |
---|
| 371 | _tty_release_lock( 0 ); |
---|
[622] | 372 | |
---|
| 373 | while(1) asm volatile("nop"); // infinite loop... |
---|
[158] | 374 | } |
---|
[622] | 375 | |
---|
| 376 | ///////////////////////////////////////////////////////////////////////// |
---|
| 377 | // convert a 32 bits unsigned int to a string of 10 decimal characters. |
---|
| 378 | ///////////////////////////////////////////////////////////////////////// |
---|
| 379 | in_drivers void _itoa_dec(unsigned val, char* buf) |
---|
[158] | 380 | { |
---|
[622] | 381 | const char DecTab[] = "0123456789"; |
---|
| 382 | unsigned int i; |
---|
| 383 | for( i=0 ; i<10 ; i++ ) |
---|
| 384 | { |
---|
| 385 | if( (val!=0) || (i==0) ) buf[9-i] = DecTab[val % 10]; |
---|
| 386 | else buf[9-i] = 0x20; |
---|
| 387 | val /= 10; |
---|
[158] | 388 | } |
---|
| 389 | } |
---|
[622] | 390 | ////////////////////////////////////////////////////////////////////////// |
---|
| 391 | // convert a 32 bits unsigned int to a string of 8 hexadecimal characters. |
---|
| 392 | /////////////////////////////////////////////////////////////////////////// |
---|
| 393 | in_drivers void _itoa_hex(unsigned int val, char* buf) |
---|
[158] | 394 | { |
---|
[622] | 395 | const char HexaTab[] = "0123456789ABCD"; |
---|
| 396 | unsigned int i; |
---|
| 397 | for( i=0 ; i<8 ; i++ ) |
---|
| 398 | { |
---|
| 399 | buf[7-i] = HexaTab[val % 16]; |
---|
| 400 | val /= 16; |
---|
[158] | 401 | } |
---|
| 402 | } |
---|
[622] | 403 | |
---|
| 404 | |
---|
| 405 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 406 | // VCI MULTI_TTY |
---|
| 407 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 408 | // The total number of TTY terminals is defined by NB_TTY_CHANNELS. |
---|
[629] | 409 | // - If there is only one terminal, it is supposed to be shared, and used by |
---|
| 410 | // all processors: a lock must be taken before display. |
---|
| 411 | // - If there is several terminals, and the number of processors is smaller |
---|
| 412 | // than the number of terminals, there is one terminal per processor, but |
---|
| 413 | // the TTY index is not equal to the proc_id, due to cluster indexing policy: |
---|
| 414 | // proc_id = cluster_xy * NB_PROCS_MAX + local_id (with cluster_xy = x << Y_WIDTH + y) |
---|
| 415 | // tty_id = cluster_id * NB_PROCS_MAX + local_id (with cluster_id = x * Y_SIZE + y) |
---|
| 416 | // - If the computed tty_id is larger than NB_TTY_CHANNELS, an error is returned. |
---|
[622] | 417 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 418 | // If USE_EXT_IO is set, we use the TTY controler implemented in cluster_io |
---|
| 419 | // (x = X_SIZE-1 / y = Y_SIZE), which requires and extended address access. |
---|
| 420 | // If USE_EXT_IO not set, we use the single channel TTY contrÃŽler in cluster (0,0). |
---|
| 421 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 422 | |
---|
| 423 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
[622] | 424 | // Write one or several characters directly from a fixed length user buffer |
---|
| 425 | // to the TTY_WRITE register of the TTY controler. |
---|
[629] | 426 | // The channel index must be checked by the calling function. |
---|
[622] | 427 | // This is a non blocking call : it test the TTY_STATUS register. |
---|
| 428 | // If the TTY_STATUS_WRITE bit is set, the transfer stops and the function |
---|
| 429 | // returns the number of characters that have been actually written. |
---|
| 430 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 431 | in_drivers int _tty_write( char* buffer, |
---|
| 432 | unsigned int length, |
---|
| 433 | unsigned int channel ) |
---|
[158] | 434 | { |
---|
[629] | 435 | unsigned int base = (unsigned int)&seg_tty_base + channel*TTY_SPAN*4; |
---|
| 436 | unsigned int nwritten = 0; |
---|
| 437 | unsigned int cluster_io = ((X_SIZE-1)<<Y_WIDTH) + Y_SIZE; |
---|
| 438 | unsigned int status; |
---|
| 439 | unsigned int i; |
---|
[622] | 440 | |
---|
| 441 | for ( i=0 ; i < length ; i++ ) |
---|
[158] | 442 | { |
---|
[629] | 443 | if( USE_EXT_IO ) // extended addressing to reach cluster_io |
---|
[622] | 444 | { |
---|
[629] | 445 | status = _word_extended_read( cluster_io, base + TTY_STATUS*4 ); |
---|
| 446 | if ( (status & 0x2) == 0x2 ) break; |
---|
| 447 | else |
---|
| 448 | { |
---|
| 449 | _byte_extended_write( cluster_io, base + TTY_WRITE*4 , buffer[i] ); |
---|
| 450 | nwritten++; |
---|
| 451 | } |
---|
[622] | 452 | } |
---|
[629] | 453 | else // direct addressing to cluster(0,0) |
---|
| 454 | { |
---|
| 455 | char* tty = (char*)base; |
---|
| 456 | if ( (tty[TTY_STATUS*4] & 0x2) == 0x2 ) break; |
---|
| 457 | else |
---|
| 458 | { |
---|
| 459 | tty[TTY_WRITE*4] = buffer[i]; // write character |
---|
| 460 | nwritten++; |
---|
| 461 | } |
---|
| 462 | } |
---|
[158] | 463 | } |
---|
[622] | 464 | |
---|
| 465 | return nwritten; |
---|
[158] | 466 | } |
---|
[629] | 467 | |
---|
[622] | 468 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 469 | // Fetch one character directly from the TTY_READ register of the TTY controler, |
---|
| 470 | // and writes this character to the user buffer. |
---|
[629] | 471 | // The channel index must be checked by the calling function. |
---|
[622] | 472 | // This is a non blocking call : it returns 0 if the register is empty, |
---|
| 473 | // and returns 1 if the register is full. |
---|
| 474 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 475 | in_drivers int _tty_read( char* buffer, |
---|
| 476 | unsigned int channel ) |
---|
[158] | 477 | { |
---|
[629] | 478 | unsigned int base = (unsigned int)&seg_tty_base + channel*TTY_SPAN*4; |
---|
| 479 | unsigned int cluster_io = ((X_SIZE-1)<<Y_WIDTH) + Y_SIZE; |
---|
| 480 | unsigned int status; |
---|
[622] | 481 | |
---|
[629] | 482 | if( USE_EXT_IO ) |
---|
[158] | 483 | { |
---|
[629] | 484 | status = _word_extended_read( cluster_io, base + TTY_STATUS*4 ); |
---|
| 485 | if ( (status & 0x1) == 0x1 ) |
---|
| 486 | { |
---|
| 487 | buffer[0] = (char)_word_extended_read( cluster_io, base + TTY_READ*4 ); |
---|
| 488 | return 1; |
---|
| 489 | } |
---|
| 490 | else |
---|
| 491 | { |
---|
| 492 | return 0; |
---|
| 493 | } |
---|
[158] | 494 | } |
---|
[622] | 495 | else |
---|
| 496 | { |
---|
[629] | 497 | char* tty = (char*)base; |
---|
| 498 | |
---|
| 499 | if((tty[TTY_STATUS*4] & 0x1) == 0x1) |
---|
| 500 | { |
---|
| 501 | buffer[0] = tty[TTY_READ*4]; |
---|
| 502 | return 1; |
---|
| 503 | } |
---|
| 504 | else |
---|
| 505 | { |
---|
| 506 | return 0; |
---|
| 507 | } |
---|
[622] | 508 | } |
---|
[158] | 509 | } |
---|
[629] | 510 | |
---|
[622] | 511 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 512 | // This function displays a string on TTY0. |
---|
| 513 | // The string must be terminated by a NUL character. |
---|
| 514 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 515 | in_drivers void _tty_puts( char* string ) |
---|
[158] | 516 | { |
---|
[622] | 517 | int length = 0; |
---|
| 518 | while (string[length] != 0) length++; |
---|
| 519 | _tty_write( string, length, 0 ); |
---|
| 520 | } |
---|
[158] | 521 | |
---|
[622] | 522 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 523 | // This function displays a 32 bits unsigned int as an hexa string on TTY0. |
---|
| 524 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 525 | in_drivers void _tty_putx(unsigned int val) |
---|
| 526 | { |
---|
| 527 | static const char HexaTab[] = "0123456789ABCDEF"; |
---|
| 528 | char buf[11]; |
---|
| 529 | unsigned int c; |
---|
| 530 | |
---|
| 531 | buf[0] = '0'; |
---|
| 532 | buf[1] = 'x'; |
---|
| 533 | buf[10] = 0; |
---|
| 534 | |
---|
| 535 | for (c = 0; c < 8; c++) |
---|
| 536 | { |
---|
| 537 | buf[9 - c] = HexaTab[val & 0xF]; |
---|
| 538 | val = val >> 4; |
---|
| 539 | } |
---|
| 540 | _tty_puts( buf ); |
---|
| 541 | } |
---|
| 542 | |
---|
| 543 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 544 | // This function displays a 32 bits unsigned int as a decimal string on TTY0. |
---|
| 545 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 546 | in_drivers void _tty_putd( unsigned int val ) |
---|
| 547 | { |
---|
| 548 | static const char DecTab[] = "0123456789"; |
---|
| 549 | char buf[11]; |
---|
| 550 | unsigned int i; |
---|
| 551 | unsigned int first; |
---|
| 552 | |
---|
| 553 | buf[10] = 0; |
---|
| 554 | |
---|
| 555 | for (i = 0; i < 10; i++) |
---|
[158] | 556 | { |
---|
[622] | 557 | if ((val != 0) || (i == 0)) |
---|
| 558 | { |
---|
| 559 | buf[9 - i] = DecTab[val % 10]; |
---|
| 560 | first = 9 - i; |
---|
| 561 | } |
---|
| 562 | else |
---|
| 563 | { |
---|
| 564 | break; |
---|
| 565 | } |
---|
| 566 | val /= 10; |
---|
| 567 | } |
---|
| 568 | _tty_puts( &buf[first] ); |
---|
| 569 | } |
---|
[158] | 570 | |
---|
[622] | 571 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 572 | // This function try to take the hardwired lock protecting exclusive access |
---|
| 573 | // to TTY terminal identified by the channel argument. |
---|
| 574 | // It returns only when the lock has been successfully taken. |
---|
| 575 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 576 | in_drivers void _tty_get_lock( unsigned int channel ) |
---|
| 577 | { |
---|
[629] | 578 | if ( USE_EXT_IO ) // extended addressing to cluster_io |
---|
| 579 | { |
---|
| 580 | unsigned int cluster_io = ((X_SIZE-1)<<Y_WIDTH) + Y_SIZE; |
---|
| 581 | unsigned int address = (unsigned int)&seg_tty_base |
---|
| 582 | + ((TTY_CONFIG + channel*TTY_SPAN)*4); |
---|
| 583 | while ( _word_extended_read( cluster_io, address ) ) asm volatile("nop"); |
---|
| 584 | } |
---|
| 585 | else // direct addressing to cluster(0,0) |
---|
| 586 | { |
---|
| 587 | unsigned int* tty = (unsigned int *) &seg_tty_base; |
---|
| 588 | while ( tty[channel * TTY_SPAN + TTY_CONFIG] ) asm volatile("nop"); |
---|
| 589 | } |
---|
[622] | 590 | } |
---|
[158] | 591 | |
---|
[622] | 592 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 593 | // This function releases the hardwired lock protecting exclusive access |
---|
| 594 | // to TTY terminal identified by the channel argument. |
---|
| 595 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 596 | in_drivers void _tty_release_lock( unsigned int channel ) |
---|
| 597 | { |
---|
[629] | 598 | if ( USE_EXT_IO ) // extended addressing to cluster_io |
---|
| 599 | { |
---|
| 600 | unsigned int cluster_io = ((X_SIZE-1)<<Y_WIDTH) + Y_SIZE; |
---|
| 601 | unsigned int address = (unsigned int)&seg_tty_base |
---|
| 602 | + ((TTY_CONFIG + channel*TTY_SPAN)*4); |
---|
| 603 | _word_extended_write( cluster_io, address, 0 ); |
---|
| 604 | } |
---|
| 605 | else // direct addressing to cluster(0,0) |
---|
| 606 | { |
---|
| 607 | unsigned int* tty_address = (unsigned int *) &seg_tty_base; |
---|
| 608 | tty_address[channel * TTY_SPAN + TTY_CONFIG] = 0; |
---|
| 609 | } |
---|
[622] | 610 | } |
---|
| 611 | |
---|
| 612 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 613 | // This function fetch a single ascii character from a terminal |
---|
| 614 | // implicitely defined by the processor ID. |
---|
| 615 | // It is a blocking function. |
---|
| 616 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 617 | in_drivers void _tty_getc( char* buf ) |
---|
| 618 | { |
---|
| 619 | unsigned int proc_id = _procid(); |
---|
| 620 | unsigned int channel; |
---|
| 621 | unsigned int l; |
---|
| 622 | unsigned int x; |
---|
| 623 | unsigned int y; |
---|
| 624 | |
---|
[629] | 625 | // check TTY channel |
---|
| 626 | l = (proc_id % NB_PROCS_MAX); |
---|
| 627 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
---|
| 628 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
---|
| 629 | channel = (x * Y_SIZE + y) * NB_PROCS_MAX + l; |
---|
| 630 | if (channel >= NB_TTY_CHANNELS ) |
---|
[622] | 631 | { |
---|
[629] | 632 | _tty_get_lock( 0 ); |
---|
| 633 | _tty_puts( "ERROR in _tty_getc(): TTY index too large\n" ); |
---|
| 634 | _tty_release_lock( 0 ); |
---|
| 635 | _exit(); |
---|
[622] | 636 | } |
---|
| 637 | |
---|
| 638 | while( _tty_read( buf, channel ) == 0 ) asm volatile("nop"); |
---|
[158] | 639 | } |
---|
[622] | 640 | |
---|
| 641 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 642 | // Fetch a string of decimal characters (most significant digit first) |
---|
| 643 | // to build a 32 bits unsigned int. |
---|
| 644 | // The terminal index is implicitely defined by the processor ID. |
---|
| 645 | // This is a blocking function. |
---|
| 646 | // The decimal characters are written in a 32 characters buffer |
---|
| 647 | // until a <LF> or <CR> character is read. |
---|
| 648 | // The <DEL> character is interpreted, and previous characters can be |
---|
| 649 | // cancelled. All others characters are ignored. |
---|
| 650 | // When the <LF> or <CR> character is received, the string is converted |
---|
| 651 | // to an unsigned int value. If the number of decimal digit is too large |
---|
| 652 | // for the 32 bits range, the zero value is returned. |
---|
| 653 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 654 | in_drivers void _tty_getw( unsigned int* word_buffer ) |
---|
[158] | 655 | { |
---|
[622] | 656 | char buf[32]; |
---|
| 657 | char byte; |
---|
| 658 | char cancel_string[3] = { 0x08, 0x20, 0x08 }; |
---|
| 659 | char zero = 0x30; |
---|
| 660 | unsigned int save = 0; |
---|
| 661 | unsigned int val = 0; |
---|
| 662 | unsigned int done = 0; |
---|
| 663 | unsigned int overflow = 0; |
---|
| 664 | unsigned int max = 0; |
---|
| 665 | unsigned int proc_id = _procid(); |
---|
| 666 | unsigned int i; |
---|
| 667 | unsigned int channel; |
---|
| 668 | unsigned int x; |
---|
| 669 | unsigned int y; |
---|
[629] | 670 | unsigned int l; |
---|
[158] | 671 | |
---|
[629] | 672 | // check TTY channel |
---|
| 673 | l = (proc_id % NB_PROCS_MAX); |
---|
| 674 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
---|
| 675 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
---|
| 676 | channel = (x * Y_SIZE + y) * NB_PROCS_MAX + l; |
---|
| 677 | if (channel >= NB_TTY_CHANNELS ) |
---|
[158] | 678 | { |
---|
[629] | 679 | _tty_get_lock( 0 ); |
---|
| 680 | _tty_puts( "ERROR in _tty_getw(): TTY index too large\n" ); |
---|
| 681 | _tty_release_lock( 0 ); |
---|
| 682 | _exit(); |
---|
[622] | 683 | } |
---|
[158] | 684 | |
---|
[622] | 685 | while( done == 0 ) |
---|
| 686 | { |
---|
| 687 | _tty_read( &byte, channel ); |
---|
| 688 | |
---|
| 689 | if (( byte > 0x2F) && (byte < 0x3A)) // decimal character |
---|
[158] | 690 | { |
---|
[622] | 691 | buf[max] = byte; |
---|
| 692 | max++; |
---|
| 693 | _tty_write( &byte, 1, channel ); |
---|
| 694 | } |
---|
| 695 | else if ( (byte == 0x0A) || (byte == 0x0D) ) // LF or CR character |
---|
| 696 | { |
---|
| 697 | done = 1; |
---|
| 698 | } |
---|
| 699 | else if ( byte == 0x7F ) // DEL character |
---|
| 700 | { |
---|
| 701 | if (max > 0) |
---|
[158] | 702 | { |
---|
[622] | 703 | max--; // cancel the character |
---|
| 704 | _tty_write( cancel_string, 3, channel ); |
---|
[158] | 705 | } |
---|
| 706 | } |
---|
| 707 | } // end while |
---|
| 708 | |
---|
| 709 | // string conversion |
---|
| 710 | for( i=0 ; i<max ; i++ ) |
---|
| 711 | { |
---|
| 712 | val = val*10 + (buf[i] - 0x30); |
---|
| 713 | if (val < save) overflow = 1; |
---|
| 714 | save = val; |
---|
| 715 | } |
---|
| 716 | if (overflow == 0) |
---|
| 717 | { |
---|
| 718 | *word_buffer = val; // return decimal value |
---|
| 719 | } |
---|
| 720 | else |
---|
| 721 | { |
---|
| 722 | for( i=0 ; i<max ; i++) // cancel the string |
---|
| 723 | { |
---|
[622] | 724 | _tty_write( cancel_string, 3, channel ); |
---|
[158] | 725 | } |
---|
[622] | 726 | _tty_write( &zero, 1, channel ); |
---|
[158] | 727 | *word_buffer = 0; // return 0 value |
---|
| 728 | } |
---|
| 729 | } |
---|
[622] | 730 | |
---|
| 731 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 732 | // This function is a simplified version of the mutek_printf() function. |
---|
| 733 | // It takes the TTY lock on the selected channel for exclusive access. |
---|
| 734 | // Only a limited number of formats are supported: |
---|
| 735 | // - %d : signed decimal |
---|
| 736 | // - %u : unsigned decimal |
---|
| 737 | // - %x : hexadecimal |
---|
| 738 | // - %c : char |
---|
| 739 | // - %s : string |
---|
| 740 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 741 | in_drivers void _tty_printf( char *format, ...) |
---|
[158] | 742 | { |
---|
| 743 | va_list ap; |
---|
[622] | 744 | va_start( ap, format ); |
---|
[158] | 745 | |
---|
[622] | 746 | unsigned int channel; |
---|
| 747 | unsigned int x; |
---|
| 748 | unsigned int y; |
---|
| 749 | unsigned int proc_id = _procid(); |
---|
| 750 | |
---|
[629] | 751 | // compute TTY channel : |
---|
| 752 | // if the number of TTY channels is smaller |
---|
| 753 | // than the number of clusters, use TTY_0_0 |
---|
| 754 | // else, TTY channel <= cluster index |
---|
| 755 | if ( NB_TTY_CHANNELS < (X_SIZE * Y_SIZE) ) |
---|
[622] | 756 | { |
---|
| 757 | channel = 0; |
---|
| 758 | } |
---|
| 759 | else |
---|
| 760 | { |
---|
| 761 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
---|
| 762 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
---|
[629] | 763 | channel = (x * Y_SIZE + y); |
---|
[622] | 764 | } |
---|
| 765 | |
---|
| 766 | // take the TTY lock |
---|
| 767 | _tty_get_lock( channel ); |
---|
| 768 | |
---|
[158] | 769 | printf_text: |
---|
| 770 | |
---|
[622] | 771 | while (*format) |
---|
| 772 | { |
---|
[158] | 773 | unsigned int i; |
---|
| 774 | for (i = 0; format[i] && format[i] != '%'; i++) |
---|
| 775 | ; |
---|
[622] | 776 | if (i) |
---|
| 777 | { |
---|
| 778 | _tty_write( format, i, channel ); |
---|
[158] | 779 | format += i; |
---|
| 780 | } |
---|
[622] | 781 | if (*format == '%') |
---|
| 782 | { |
---|
[158] | 783 | format++; |
---|
| 784 | goto printf_arguments; |
---|
| 785 | } |
---|
| 786 | } // end while |
---|
| 787 | |
---|
[622] | 788 | va_end( ap ); |
---|
[158] | 789 | |
---|
[622] | 790 | // release lock |
---|
| 791 | _tty_release_lock( 0 ); |
---|
| 792 | |
---|
| 793 | return; |
---|
| 794 | |
---|
[158] | 795 | printf_arguments: |
---|
| 796 | |
---|
| 797 | { |
---|
[622] | 798 | int val = va_arg(ap, long); |
---|
| 799 | char buf[20]; |
---|
| 800 | char* pbuf; |
---|
[158] | 801 | unsigned int len = 0; |
---|
| 802 | static const char HexaTab[] = "0123456789ABCDEF"; |
---|
| 803 | unsigned int i; |
---|
| 804 | |
---|
| 805 | switch (*format++) { |
---|
| 806 | case ('c'): // char conversion |
---|
| 807 | len = 1; |
---|
| 808 | buf[0] = val; |
---|
| 809 | pbuf = buf; |
---|
| 810 | break; |
---|
| 811 | case ('d'): // decimal signed integer |
---|
[622] | 812 | if (val < 0) |
---|
| 813 | { |
---|
[158] | 814 | val = -val; |
---|
[622] | 815 | _tty_write( "_" , 1, channel ); |
---|
[158] | 816 | } |
---|
| 817 | case ('u'): // decimal unsigned integer |
---|
[622] | 818 | for( i=0 ; i<10 ; i++) |
---|
| 819 | { |
---|
[158] | 820 | buf[9-i] = HexaTab[val % 10]; |
---|
| 821 | if (!(val /= 10)) break; |
---|
| 822 | } |
---|
| 823 | len = i+1; |
---|
| 824 | pbuf = &buf[9-i]; |
---|
| 825 | break; |
---|
| 826 | case ('x'): // hexadecimal integer |
---|
[622] | 827 | _tty_write( "0x", 2, channel ); |
---|
| 828 | for( i=0 ; i<8 ; i++) |
---|
| 829 | { |
---|
[158] | 830 | buf[7-i] = HexaTab[val % 16U]; |
---|
| 831 | if (!(val /= 16U)) break; |
---|
| 832 | } |
---|
| 833 | len = i+1; |
---|
| 834 | pbuf = &buf[7-i]; |
---|
| 835 | break; |
---|
| 836 | case ('s'): // string |
---|
| 837 | { |
---|
| 838 | char *str = (char*)val; |
---|
| 839 | while ( str[len] ) len++; |
---|
| 840 | pbuf = (char*)val; |
---|
| 841 | } |
---|
| 842 | break; |
---|
| 843 | default: |
---|
| 844 | goto printf_text; |
---|
| 845 | } // end switch |
---|
| 846 | |
---|
[622] | 847 | _tty_write( pbuf, len, channel ); |
---|
[158] | 848 | goto printf_text; |
---|
| 849 | } |
---|
| 850 | } // end printf() |
---|
| 851 | |
---|
[622] | 852 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 853 | // These functions are the ISRs that must be executed when an IRQ is activated |
---|
[629] | 854 | // by the TTY: _tty_isr_XX is associated to TTY channel [XX]. |
---|
| 855 | // It save the character in the communication buffer _tty_get_buf[XX], |
---|
| 856 | // and set the set/reset variable _tty_get_full[XX]. |
---|
[622] | 857 | // A character is lost if the buffer is full when the ISR is executed. |
---|
| 858 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 859 | in_drivers void _tty_isr_indexed(size_t index) |
---|
[158] | 860 | { |
---|
[629] | 861 | if ( USE_EXT_IO ) // extended addressing to TTY in cluster_io |
---|
| 862 | { |
---|
| 863 | unsigned int cluster = ((X_SIZE-1)<<Y_WIDTH) + Y_SIZE; |
---|
| 864 | unsigned int base = (unsigned int)&seg_tty_base + |
---|
| 865 | ((index*TTY_SPAN + TTY_READ)*4); |
---|
[622] | 866 | |
---|
[629] | 867 | _tty_get_buf[index] = (char)_word_extended_read( cluster, base ); |
---|
| 868 | } |
---|
| 869 | else // direct addressing to TTY in cluster(0,0) |
---|
| 870 | { |
---|
| 871 | char* tty = (char*)&seg_tty_base + index*TTY_SPAN*4; |
---|
| 872 | |
---|
| 873 | _tty_get_buf[index] = tty[TTY_READ*4]; // save character and reset IRQ |
---|
| 874 | } |
---|
| 875 | _tty_get_full[index] = 1; // signals character available |
---|
[158] | 876 | } |
---|
[622] | 877 | |
---|
[629] | 878 | in_drivers void _tty_isr() { _tty_isr_indexed(0); } |
---|
| 879 | |
---|
[622] | 880 | in_drivers void _tty_isr_00() { _tty_isr_indexed(0); } |
---|
| 881 | in_drivers void _tty_isr_01() { _tty_isr_indexed(1); } |
---|
| 882 | in_drivers void _tty_isr_02() { _tty_isr_indexed(2); } |
---|
| 883 | in_drivers void _tty_isr_03() { _tty_isr_indexed(3); } |
---|
| 884 | in_drivers void _tty_isr_04() { _tty_isr_indexed(4); } |
---|
| 885 | in_drivers void _tty_isr_05() { _tty_isr_indexed(5); } |
---|
| 886 | in_drivers void _tty_isr_06() { _tty_isr_indexed(6); } |
---|
| 887 | in_drivers void _tty_isr_07() { _tty_isr_indexed(7); } |
---|
| 888 | in_drivers void _tty_isr_08() { _tty_isr_indexed(8); } |
---|
| 889 | in_drivers void _tty_isr_09() { _tty_isr_indexed(9); } |
---|
| 890 | in_drivers void _tty_isr_10() { _tty_isr_indexed(10); } |
---|
| 891 | in_drivers void _tty_isr_11() { _tty_isr_indexed(11); } |
---|
| 892 | in_drivers void _tty_isr_12() { _tty_isr_indexed(12); } |
---|
| 893 | in_drivers void _tty_isr_13() { _tty_isr_indexed(13); } |
---|
| 894 | in_drivers void _tty_isr_14() { _tty_isr_indexed(14); } |
---|
| 895 | in_drivers void _tty_isr_15() { _tty_isr_indexed(15); } |
---|
| 896 | in_drivers void _tty_isr_16() { _tty_isr_indexed(16); } |
---|
| 897 | in_drivers void _tty_isr_17() { _tty_isr_indexed(17); } |
---|
| 898 | in_drivers void _tty_isr_18() { _tty_isr_indexed(18); } |
---|
| 899 | in_drivers void _tty_isr_19() { _tty_isr_indexed(19); } |
---|
| 900 | in_drivers void _tty_isr_20() { _tty_isr_indexed(20); } |
---|
| 901 | in_drivers void _tty_isr_21() { _tty_isr_indexed(21); } |
---|
| 902 | in_drivers void _tty_isr_22() { _tty_isr_indexed(22); } |
---|
| 903 | in_drivers void _tty_isr_23() { _tty_isr_indexed(23); } |
---|
| 904 | in_drivers void _tty_isr_24() { _tty_isr_indexed(24); } |
---|
| 905 | in_drivers void _tty_isr_25() { _tty_isr_indexed(25); } |
---|
| 906 | in_drivers void _tty_isr_26() { _tty_isr_indexed(26); } |
---|
| 907 | in_drivers void _tty_isr_27() { _tty_isr_indexed(27); } |
---|
| 908 | in_drivers void _tty_isr_28() { _tty_isr_indexed(28); } |
---|
| 909 | in_drivers void _tty_isr_29() { _tty_isr_indexed(29); } |
---|
| 910 | in_drivers void _tty_isr_30() { _tty_isr_indexed(30); } |
---|
| 911 | in_drivers void _tty_isr_31() { _tty_isr_indexed(31); } |
---|
| 912 | |
---|
| 913 | |
---|
| 914 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 915 | // BLOCK_DEVICE (IOC) |
---|
| 916 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 917 | // The functions below use the three variables _ioc_lock _ioc_done, |
---|
[622] | 918 | // and _ioc_status for synchronisation. |
---|
| 919 | // - As the IOC component can be used by several programs running in parallel, |
---|
| 920 | // the _ioc_lock variable guaranties exclusive access to the device. |
---|
| 921 | // The _ioc_read() and _ioc_write() functions use atomic LL/SC to get the lock. |
---|
| 922 | // and set _ioc_lock to a non zero value. |
---|
| 923 | // The _ioc_write() and _ioc_read() functions are blocking, polling the _ioc_lock |
---|
| 924 | // variable until the device is available. |
---|
| 925 | // - When the tranfer is completed, the ISR routine activated by the IOC IRQ |
---|
| 926 | // set the _ioc_done variable to a non-zero value. Possible address errors detected |
---|
| 927 | // by the IOC peripheral are reported by the ISR in the _ioc_status variable. |
---|
| 928 | // The _ioc_completed() function is polling the _ioc_done variable, waiting for |
---|
| 929 | // tranfer conpletion. When the completion is signaled, the _ioc_completed() function |
---|
| 930 | // reset the _ioc_done variable to zero, and releases the _ioc_lock variable. |
---|
| 931 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 932 | // If USE_EXT_IO is set, we use the IOC controler implemented in cluster_io |
---|
| 933 | // (x = X_SIZE-1 / y = Y_SIZE), which requires and extended address access. |
---|
| 934 | // If USE_EXT_IO not set, we use the IOC contrÃŽler in cluster (0,0). |
---|
| 935 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 936 | |
---|
| 937 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
[622] | 938 | // This blocking function is used by the _ioc_read() and _ioc_write() functions |
---|
| 939 | // to get _ioc_lock using LL/SC. |
---|
| 940 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 941 | in_drivers void _ioc_get_lock() |
---|
[158] | 942 | { |
---|
[622] | 943 | register unsigned int* plock = (unsigned int*)&_ioc_lock; |
---|
| 944 | |
---|
| 945 | asm volatile ("_ioc_llsc: \n" |
---|
| 946 | "ll $2, 0(%0) \n" // $2 <= _ioc_lock |
---|
| 947 | "bnez $2, _ioc_llsc \n" // retry if busy |
---|
| 948 | "li $3, 1 \n" // prepare argument for sc |
---|
| 949 | "sc $3, 0(%0) \n" // try to set _ioc_busy |
---|
| 950 | "beqz $3, _ioc_llsc \n" // retry if not atomic |
---|
| 951 | ::"r"(plock):"$2","$3"); |
---|
[158] | 952 | } |
---|
[629] | 953 | |
---|
[622] | 954 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 955 | // Transfer data from a memory buffer to the block_device. |
---|
| 956 | // - lba : first block index on the disk |
---|
| 957 | // - buffer : base address of the memory buffer |
---|
| 958 | // - count : number of blocks to be transfered |
---|
[629] | 959 | // - ext : cluster index for the memory buffer |
---|
[622] | 960 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 961 | in_drivers void _ioc_write( size_t lba, |
---|
| 962 | void* buffer, |
---|
| 963 | size_t count, |
---|
| 964 | size_t ext ) |
---|
[158] | 965 | { |
---|
[622] | 966 | // get the lock |
---|
| 967 | _ioc_get_lock(); |
---|
| 968 | |
---|
[629] | 969 | if ( USE_EXT_IO ) // extended addressing to cluster_io |
---|
| 970 | { |
---|
| 971 | unsigned int cluster = ((X_SIZE-1)<<Y_WIDTH) + Y_SIZE; |
---|
| 972 | unsigned int base = (unsigned int)&seg_ioc_base; |
---|
| 973 | |
---|
| 974 | _word_extended_write( cluster, base + BLOCK_DEVICE_BUFFER*4, (unsigned int)buffer ); |
---|
| 975 | _word_extended_write( cluster, base + BLOCK_DEVICE_BUFFER_EXT*4, ext ); |
---|
| 976 | _word_extended_write( cluster, base + BLOCK_DEVICE_COUNT*4, count ); |
---|
| 977 | _word_extended_write( cluster, base + BLOCK_DEVICE_LBA*4, lba ); |
---|
| 978 | _word_extended_write( cluster, base + BLOCK_DEVICE_IRQ_ENABLE*4, 1 ); |
---|
| 979 | _word_extended_write( cluster, base + BLOCK_DEVICE_OP*4, BLOCK_DEVICE_WRITE ); |
---|
| 980 | } |
---|
| 981 | else // direct addressing to cluster(0,0) |
---|
| 982 | { |
---|
| 983 | unsigned int* ioc = (unsigned int*)&seg_ioc_base; |
---|
| 984 | |
---|
| 985 | ioc[BLOCK_DEVICE_BUFFER] = (unsigned int)buffer; |
---|
| 986 | ioc[BLOCK_DEVICE_BUFFER_EXT] = ext; |
---|
| 987 | ioc[BLOCK_DEVICE_COUNT] = count; |
---|
| 988 | ioc[BLOCK_DEVICE_LBA] = lba; |
---|
| 989 | ioc[BLOCK_DEVICE_IRQ_ENABLE] = 1; |
---|
| 990 | ioc[BLOCK_DEVICE_OP] = BLOCK_DEVICE_WRITE; |
---|
| 991 | } |
---|
[158] | 992 | } |
---|
[629] | 993 | |
---|
[622] | 994 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 995 | // Transfer data from a file on the block device to a memory buffer. |
---|
| 996 | // - lba : first block index on the disk |
---|
| 997 | // - buffer : base address of the memory buffer |
---|
| 998 | // - count : number of blocks to be transfered |
---|
[629] | 999 | // - ext : cluster index for the memory buffer |
---|
[622] | 1000 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1001 | in_drivers void _ioc_read( size_t lba, |
---|
| 1002 | void* buffer, |
---|
| 1003 | size_t count, |
---|
| 1004 | size_t ext ) |
---|
[158] | 1005 | { |
---|
[622] | 1006 | // get the lock |
---|
| 1007 | _ioc_get_lock(); |
---|
| 1008 | |
---|
[629] | 1009 | if ( USE_EXT_IO ) // extended addressing to cluster_io |
---|
| 1010 | { |
---|
| 1011 | unsigned int cluster = ((X_SIZE-1)<<Y_WIDTH) + Y_SIZE; |
---|
| 1012 | unsigned int base = (unsigned int)&seg_ioc_base; |
---|
| 1013 | |
---|
| 1014 | _word_extended_write( cluster, base + BLOCK_DEVICE_BUFFER*4, (unsigned int)buffer ); |
---|
| 1015 | _word_extended_write( cluster, base + BLOCK_DEVICE_BUFFER_EXT*4, ext ); |
---|
| 1016 | _word_extended_write( cluster, base + BLOCK_DEVICE_COUNT*4, count ); |
---|
| 1017 | _word_extended_write( cluster, base + BLOCK_DEVICE_LBA*4, lba ); |
---|
| 1018 | _word_extended_write( cluster, base + BLOCK_DEVICE_IRQ_ENABLE*4, 1 ); |
---|
| 1019 | _word_extended_write( cluster, base + BLOCK_DEVICE_OP*4, BLOCK_DEVICE_READ ); |
---|
| 1020 | } |
---|
| 1021 | else // direct addressing to cluster(0,0) |
---|
| 1022 | { |
---|
| 1023 | unsigned int* ioc = (unsigned int*)&seg_ioc_base; |
---|
| 1024 | |
---|
| 1025 | ioc[BLOCK_DEVICE_BUFFER] = (unsigned int)buffer; |
---|
| 1026 | ioc[BLOCK_DEVICE_BUFFER_EXT] = ext; |
---|
| 1027 | ioc[BLOCK_DEVICE_COUNT] = count; |
---|
| 1028 | ioc[BLOCK_DEVICE_LBA] = lba; |
---|
| 1029 | ioc[BLOCK_DEVICE_IRQ_ENABLE] = 1; |
---|
| 1030 | ioc[BLOCK_DEVICE_OP] = BLOCK_DEVICE_READ; |
---|
| 1031 | } |
---|
[158] | 1032 | } |
---|
[629] | 1033 | |
---|
[622] | 1034 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1035 | // This blocking function cheks completion of an I/O transfer and reports errors. |
---|
| 1036 | // It returns 0 if the transfer is successfully completed. |
---|
| 1037 | // It returns -1 if an error has been reported. |
---|
| 1038 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1039 | in_drivers void _ioc_completed() |
---|
[158] | 1040 | { |
---|
[622] | 1041 | // waiting for completion |
---|
| 1042 | while (_ioc_done == 0) asm volatile("nop"); |
---|
| 1043 | |
---|
| 1044 | // reset synchronisation variables |
---|
| 1045 | _ioc_done = 0; |
---|
| 1046 | _ioc_lock = 0; |
---|
| 1047 | |
---|
| 1048 | if( (_ioc_status != BLOCK_DEVICE_READ_SUCCESS) && |
---|
| 1049 | (_ioc_status != BLOCK_DEVICE_WRITE_SUCCESS) ) |
---|
| 1050 | { |
---|
| 1051 | _tty_get_lock( 0 ); |
---|
| 1052 | _tty_puts( "ERROR in _ioc_completed()\n"); |
---|
| 1053 | _tty_release_lock( 0 ); |
---|
| 1054 | _exit(); |
---|
| 1055 | } |
---|
[158] | 1056 | } |
---|
[629] | 1057 | |
---|
[622] | 1058 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1059 | // This ISR must be executed when an IRQ is activated by IOC to signal completion. |
---|
| 1060 | // It acknowledge the IRQ using the ioc base address, save the status in _ioc_status, |
---|
| 1061 | // and set the _ioc_done variable to signal completion. |
---|
| 1062 | // This variable is defined in the drivers.c file. |
---|
| 1063 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1064 | in_drivers void _ioc_isr() |
---|
[158] | 1065 | { |
---|
[629] | 1066 | if ( USE_EXT_IO ) // extended addressing to cluster_io |
---|
| 1067 | { |
---|
| 1068 | unsigned int cluster = ((X_SIZE-1)<<Y_WIDTH) + Y_SIZE; |
---|
| 1069 | unsigned int base = (unsigned int)&seg_ioc_base; |
---|
| 1070 | |
---|
| 1071 | _ioc_status = _word_extended_read( cluster, base + BLOCK_DEVICE_STATUS*4 ); |
---|
| 1072 | } |
---|
| 1073 | else // direct addressing to cluster(Ã ,0) |
---|
| 1074 | { |
---|
| 1075 | unsigned int* ioc = (unsigned int*)&seg_ioc_base; |
---|
[622] | 1076 | |
---|
[629] | 1077 | _ioc_status = ioc[BLOCK_DEVICE_STATUS]; // save status & reset IRQ |
---|
| 1078 | } |
---|
| 1079 | _ioc_done = 1; // signals completion |
---|
[158] | 1080 | } |
---|
[622] | 1081 | |
---|
| 1082 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1083 | // This ISR must be executed when an IRQ is activated by MEMC to signal |
---|
| 1084 | // an error detected by the TSAR memory cache after a write transaction. |
---|
| 1085 | // It displays an error message on the TTY terminal allocated to the processor |
---|
| 1086 | // executing the ISR. |
---|
| 1087 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1088 | in_drivers void _mmc_isr() |
---|
[158] | 1089 | { |
---|
[622] | 1090 | int* mmc_address = (int*)&seg_mmc_base; |
---|
| 1091 | unsigned int cluster_xy = _procid() / NB_PROCS_MAX; |
---|
| 1092 | |
---|
| 1093 | _tty_printf( "WRITE ERROR signaled by Memory Cache in cluster %x\n", cluster_xy ); |
---|
[158] | 1094 | } |
---|
[622] | 1095 | |
---|
| 1096 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1097 | // FRAME_BUFFER |
---|
[629] | 1098 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
[622] | 1099 | // The _fb_sync_write & _fb_sync_read functions use a memcpy strategy to implement |
---|
| 1100 | // the transfer between a data buffer and the frame buffer. |
---|
| 1101 | // They are blocking until completion of the transfer. |
---|
| 1102 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 1103 | |
---|
| 1104 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
[622] | 1105 | // _fb_sync_write() |
---|
| 1106 | // Transfer data from an user buffer to the frame_buffer device with a memcpy. |
---|
[629] | 1107 | // - offset : offset (in bytes) in the frame buffer |
---|
[622] | 1108 | // - buffer : base address of the memory buffer |
---|
| 1109 | // - length : number of bytes to be transfered |
---|
[629] | 1110 | // - ext : cluster_xy for the user buffer |
---|
[622] | 1111 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 1112 | in_drivers void _fb_sync_write( unsigned int offset, |
---|
| 1113 | unsigned int buffer, |
---|
| 1114 | unsigned int length, |
---|
| 1115 | unsigned int ext ) |
---|
[158] | 1116 | { |
---|
[629] | 1117 | unsigned int src_address = buffer; |
---|
| 1118 | unsigned int src_cluster = ext; |
---|
| 1119 | unsigned int dst_address = (unsigned int)&seg_fbf_base + offset; |
---|
| 1120 | unsigned int dst_cluster = ((X_SIZE-1)<<Y_WIDTH) + Y_SIZE; // cluster_xy for I/O |
---|
[158] | 1121 | |
---|
[629] | 1122 | _extended_memcpy( dst_cluster, |
---|
| 1123 | dst_address, |
---|
| 1124 | src_cluster, |
---|
| 1125 | src_address, |
---|
| 1126 | length ); |
---|
[158] | 1127 | } |
---|
[629] | 1128 | |
---|
[622] | 1129 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1130 | // _fb_sync_read() |
---|
| 1131 | // Transfer data from the frame_buffer device to an user buffer with a memcpy. |
---|
[629] | 1132 | // - offset : offset (in bytes) in the frame buffer |
---|
[622] | 1133 | // - buffer : base address of the memory buffer |
---|
| 1134 | // - length : number of bytes to be transfered |
---|
[629] | 1135 | // - ext : cluster_xy for the user buffer |
---|
[622] | 1136 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 1137 | in_drivers void _fb_sync_read( unsigned int offset, |
---|
| 1138 | unsigned int buffer, |
---|
| 1139 | unsigned int length, |
---|
| 1140 | unsigned int ext ) |
---|
[158] | 1141 | { |
---|
[629] | 1142 | unsigned int dst_address = buffer; |
---|
| 1143 | unsigned int dst_cluster = ext; |
---|
| 1144 | unsigned int src_address = (unsigned int)&seg_fbf_base + offset; |
---|
| 1145 | unsigned int src_cluster = ((X_SIZE-1)<<Y_WIDTH) + Y_SIZE; // cluster_xy for I/O |
---|
[622] | 1146 | |
---|
[629] | 1147 | _extended_memcpy( dst_cluster, |
---|
| 1148 | dst_address, |
---|
| 1149 | src_cluster, |
---|
| 1150 | src_address, |
---|
| 1151 | length ); |
---|
[158] | 1152 | } |
---|
[622] | 1153 | |
---|
| 1154 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1155 | // Release a software spin-lock |
---|
| 1156 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1157 | in_drivers void _release_lock(size_t index) |
---|
| 1158 | |
---|
[158] | 1159 | { |
---|
[622] | 1160 | if( index >= NB_LOCKS ) |
---|
| 1161 | { |
---|
| 1162 | _tty_get_lock( 0 ); |
---|
| 1163 | _tty_puts( "ERROR in _release_lock()" ); |
---|
| 1164 | _tty_release_lock( 0 ); |
---|
| 1165 | _exit(); |
---|
| 1166 | } |
---|
| 1167 | |
---|
| 1168 | _spin_lock[index] = 0; |
---|
[158] | 1169 | } |
---|
[629] | 1170 | |
---|
[622] | 1171 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1172 | // Try to take a software spin-lock. |
---|
| 1173 | // This is a blocking call, as there is a busy-waiting loop, |
---|
| 1174 | // until the lock is granted to the requester. |
---|
| 1175 | // There is an internal delay of about 100 cycles between |
---|
| 1176 | // two successive lock read, to avoid bus saturation. |
---|
| 1177 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1178 | in_drivers void _get_lock(size_t index) |
---|
[158] | 1179 | { |
---|
[622] | 1180 | if( index >= NB_LOCKS ) |
---|
| 1181 | { |
---|
| 1182 | _tty_get_lock( 0 ); |
---|
| 1183 | _tty_puts( "ERROR in _get_lock()" ); |
---|
| 1184 | _tty_release_lock( 0 ); |
---|
| 1185 | _exit(); |
---|
| 1186 | } |
---|
[158] | 1187 | |
---|
[622] | 1188 | register int delay = ((_proctime() +_procid()) & 0xF) << 4; |
---|
| 1189 | register int * plock = (int *) &_spin_lock[index]; |
---|
[158] | 1190 | |
---|
[622] | 1191 | asm volatile ("_locks_llsc: \n" |
---|
| 1192 | "ll $2, 0(%0) \n" // $2 <= _locks_lock |
---|
| 1193 | "bnez $2, _locks_delay \n" // random delay if busy |
---|
| 1194 | "li $3, 1 \n" // prepare argument for sc |
---|
| 1195 | "sc $3, 0(%0) \n" // try to set _locks_busy |
---|
| 1196 | "bnez $3, _locks_ok \n" // exit if atomic |
---|
| 1197 | "_locks_delay: \n" |
---|
| 1198 | "move $4, %1 \n" // $4 <= delay |
---|
| 1199 | "_locks_loop: \n" |
---|
| 1200 | "addi $4, $4, -1 \n" // $4 <= $4 - 1 |
---|
| 1201 | "beqz $4, _locks_loop \n" // test end delay |
---|
| 1202 | "j _locks_llsc \n" // retry |
---|
| 1203 | "_locks_ok: \n" |
---|
| 1204 | ::"r"(plock),"r"(delay):"$2","$3","$4"); |
---|
[158] | 1205 | } |
---|
| 1206 | |
---|
[622] | 1207 | |
---|
| 1208 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1209 | // This function makes a cooperative initialisation of the barrier: |
---|
| 1210 | // - barrier_count[index] <= N |
---|
| 1211 | // - barrier_lock[index] <= 0 |
---|
| 1212 | // All tasks try to initialize the barrier, but the initialisation |
---|
| 1213 | // is done by only one task, using LL/SC instructions. |
---|
| 1214 | // This cooperative initialisation is questionnable, |
---|
| 1215 | // because the barrier can ony be initialised once... |
---|
| 1216 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1217 | in_drivers void _barrier_init(unsigned int index, unsigned int value) |
---|
[158] | 1218 | { |
---|
| 1219 | |
---|
[622] | 1220 | register int* pinit = (int*)&_barrier_value[index]; |
---|
| 1221 | register int* pcount = (int*)&_barrier_count[index]; |
---|
| 1222 | register int* plock = (int*)&_barrier_lock[index]; |
---|
| 1223 | |
---|
| 1224 | if ( index >= NB_BARRIERS ) |
---|
| 1225 | { |
---|
| 1226 | _tty_get_lock( 0 ); |
---|
| 1227 | _tty_puts( "ERROR in _barrier_init()" ); |
---|
| 1228 | _tty_release_lock( 0 ); |
---|
| 1229 | _exit(); |
---|
| 1230 | } |
---|
| 1231 | |
---|
| 1232 | // parallel initialisation using atomic instructions LL/SC |
---|
| 1233 | asm volatile ("_barrier_init_test: \n" |
---|
| 1234 | "ll $2, 0(%0) \n" // read barrier_value |
---|
| 1235 | "bnez $2, _barrier_init_done \n" |
---|
| 1236 | "move $3, %3 \n" |
---|
| 1237 | "sc $3, 0(%0) \n" // try to write barrier_value |
---|
| 1238 | "beqz $3, _barrier_init_test \n" |
---|
| 1239 | "move $3, %3 \n" |
---|
| 1240 | "sw $3, 0(%1) \n" // barrier_count <= barrier_value |
---|
| 1241 | "move $3, $0 \n" // |
---|
| 1242 | "sw $3, 0(%2) \n" // barrier_lock <= 0 |
---|
| 1243 | "_barrier_init_done: \n" |
---|
| 1244 | ::"r"(pinit),"r"(pcount),"r"(plock),"r"(value):"$2","$3"); |
---|
[158] | 1245 | } |
---|
[629] | 1246 | |
---|
[622] | 1247 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1248 | // This blocking function uses a busy_wait technics (on the barrier_lock value), |
---|
| 1249 | // because the GIET does not support dynamic scheduling/descheduling of tasks. |
---|
| 1250 | // The barrier state is actually defined by two variables: |
---|
| 1251 | // _barrier_count[index] define the number of particpants that are waiting |
---|
| 1252 | // _barrier_lock[index] define the bool variable whose value is polled |
---|
| 1253 | // The last participant change the value of _barrier_lock[index] to release the barrier... |
---|
| 1254 | // There is at most 16 independant barriers, and an error is returned |
---|
| 1255 | // if the barrier index is larger than 15. |
---|
| 1256 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1257 | in_drivers void _barrier_wait(unsigned int index) |
---|
[158] | 1258 | { |
---|
[622] | 1259 | register int* pcount = (int*)&_barrier_count[index]; |
---|
| 1260 | register int count; |
---|
[158] | 1261 | |
---|
[622] | 1262 | int lock = _barrier_lock[index]; |
---|
| 1263 | |
---|
| 1264 | if ( index >= NB_BARRIERS ) |
---|
| 1265 | { |
---|
| 1266 | _tty_get_lock( 0 ); |
---|
| 1267 | _tty_puts( "ERROR in _barrier_wait()" ); |
---|
| 1268 | _tty_release_lock( 0 ); |
---|
| 1269 | _exit(); |
---|
| 1270 | } |
---|
| 1271 | |
---|
| 1272 | // parallel decrement _barrier_count[index] using atomic instructions LL/SC |
---|
| 1273 | // input : pointer on _barrier_count[index] |
---|
| 1274 | // output : count = _barrier_count[index] (before decrementation) |
---|
| 1275 | asm volatile ("_barrier_decrement: \n" |
---|
| 1276 | "ll %0, 0(%1) \n" |
---|
| 1277 | "addi $3, %0, -1 \n" |
---|
| 1278 | "sc $3, 0(%1) \n" |
---|
| 1279 | "beqz $3, _barrier_decrement \n" |
---|
| 1280 | :"=&r"(count) |
---|
| 1281 | :"r"(pcount) |
---|
| 1282 | :"$2","$3"); |
---|
| 1283 | |
---|
| 1284 | // the last task re-initializes the barrier_ count variable |
---|
| 1285 | // and the barrier_lock variable, waking up all other waiting tasks |
---|
| 1286 | |
---|
| 1287 | if ( count == 1 ) // last task |
---|
| 1288 | { |
---|
| 1289 | _barrier_count[index] = _barrier_value[index]; |
---|
| 1290 | asm volatile( "sync" ); |
---|
| 1291 | _barrier_lock[index] = (lock == 0) ? 1 : 0; |
---|
| 1292 | } |
---|
| 1293 | else // other tasks |
---|
| 1294 | { |
---|
| 1295 | while ( lock == _barrier_lock[index] ) asm volatile("nop"); |
---|
| 1296 | } |
---|
| 1297 | } |
---|
| 1298 | |
---|
| 1299 | |
---|
[158] | 1300 | // Local Variables: |
---|
| 1301 | // tab-width: 4; |
---|
| 1302 | // c-basic-offset: 4; |
---|
| 1303 | // c-file-offsets:((innamespace . 0)(inline-open . 0)); |
---|
| 1304 | // indent-tabs-mode: nil; |
---|
| 1305 | // End: |
---|
| 1306 | // |
---|
| 1307 | // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
---|
| 1308 | |
---|