[158] | 1 | /////////////////////////////////////////////////////////////////////////////////// |
---|
| 2 | // File : drivers.c |
---|
| 3 | // Date : 01/04/2012 |
---|
| 4 | // Author : alain greiner |
---|
| 5 | // Copyright (c) UPMC-LIP6 |
---|
| 6 | /////////////////////////////////////////////////////////////////////////////////// |
---|
[189] | 7 | // The drivers.c and drivers.h files are part ot the GIET-VM nano kernel. |
---|
[158] | 8 | // They contains the drivers for the peripherals available in the SoCLib library: |
---|
| 9 | // - vci_multi_tty |
---|
| 10 | // - vci_multi_timer |
---|
| 11 | // - vci_multi_dma |
---|
| 12 | // - vci_multi_icu |
---|
[203] | 13 | // - vci_xicu & vci_multi_icu |
---|
[158] | 14 | // - vci_gcd |
---|
| 15 | // - vci_frame_buffer |
---|
| 16 | // - vci_block_device |
---|
| 17 | // |
---|
| 18 | // The following global parameters must be defined in the giet_config.h file: |
---|
[204] | 19 | // - CLUSTER_SIZE |
---|
[189] | 20 | // - NB_CLUSTERS |
---|
| 21 | // - NB_PROCS_MAX |
---|
| 22 | // - NB_TIMERS_MAX |
---|
| 23 | // - NB_DMAS_MAX |
---|
| 24 | // - NB_TTYS |
---|
[158] | 25 | // |
---|
[218] | 26 | // The following virtual base addresses must be defined in the giet_vsegs.ld file: |
---|
[158] | 27 | // - seg_icu_base |
---|
[203] | 28 | // - seg_tim_base |
---|
[158] | 29 | // - seg_tty_base |
---|
| 30 | // - seg_gcd_base |
---|
| 31 | // - seg_dma_base |
---|
[203] | 32 | // - seg_fbf_base |
---|
[158] | 33 | // - seg_ioc_base |
---|
[218] | 34 | // - seg_nic_base |
---|
[204] | 35 | // As some peripherals can be replicated in the clusters (ICU, TIMER, DMA) |
---|
| 36 | // These addresses must be completed by an offset depending on the cluster index |
---|
| 37 | // full_base_address = seg_***_base + cluster_id * CLUSTER_SIZE |
---|
[158] | 38 | /////////////////////////////////////////////////////////////////////////////////// |
---|
| 39 | |
---|
[166] | 40 | #include <vm_handler.h> |
---|
[158] | 41 | #include <sys_handler.h> |
---|
| 42 | #include <giet_config.h> |
---|
| 43 | #include <drivers.h> |
---|
| 44 | #include <common.h> |
---|
| 45 | #include <hwr_mapping.h> |
---|
| 46 | #include <mips32_registers.h> |
---|
| 47 | #include <ctx_handler.h> |
---|
| 48 | |
---|
| 49 | #if !defined(NB_CLUSTERS) |
---|
[215] | 50 | # error: You must define NB_CLUSTERS in the configs file |
---|
[158] | 51 | #endif |
---|
[189] | 52 | |
---|
| 53 | #if !defined(NB_PROCS_MAX) |
---|
[215] | 54 | # error: You must define NB_PROCS_MAX in the configs file |
---|
[189] | 55 | #endif |
---|
| 56 | |
---|
| 57 | #if (NB_PROCS_MAX > 8) |
---|
| 58 | # error: NB_PROCS_MAX cannot be larger than 8! |
---|
| 59 | #endif |
---|
| 60 | |
---|
[204] | 61 | #if !defined(CLUSTER_SIZE) |
---|
[215] | 62 | # error: You must define CLUSTER_SIZE in the configs file |
---|
[158] | 63 | #endif |
---|
[189] | 64 | |
---|
[158] | 65 | #if !defined(NB_TTYS) |
---|
[215] | 66 | # error: You must define NB_TTYS in the configs file |
---|
[158] | 67 | #endif |
---|
| 68 | |
---|
[165] | 69 | #if (NB_TTYS < 1) |
---|
| 70 | # error: NB_TTYS cannot be smaller than 1! |
---|
| 71 | #endif |
---|
| 72 | |
---|
[189] | 73 | #if !defined(NB_DMAS_MAX) |
---|
[205] | 74 | #define NB_DMAS_MAX 0 |
---|
[165] | 75 | #endif |
---|
| 76 | |
---|
[189] | 77 | #if !defined(NB_TIMERS_MAX) |
---|
[205] | 78 | #define NB_TIMERS_MAX 0 |
---|
[165] | 79 | #endif |
---|
| 80 | |
---|
[216] | 81 | #if ( (NB_TIMERS_MAX) > 32 ) |
---|
[189] | 82 | # error: NB_TIMERS_MAX + NB_PROCS_MAX cannot be larger than 32 |
---|
| 83 | #endif |
---|
[165] | 84 | |
---|
[189] | 85 | #if !defined(NB_IOCS) |
---|
[215] | 86 | # error: You must define NB_IOCS in the configs file |
---|
[189] | 87 | #endif |
---|
[158] | 88 | |
---|
[189] | 89 | #if ( NB_IOCS > 1 ) |
---|
| 90 | # error: NB_IOCS cannot be larger than 1 |
---|
| 91 | #endif |
---|
[158] | 92 | |
---|
[215] | 93 | #if !defined( USE_XICU ) |
---|
| 94 | # error: You must define USE_XICU in the configs file |
---|
| 95 | #endif |
---|
[158] | 96 | |
---|
[215] | 97 | #if !defined( IOMMU_ACTIVE ) |
---|
| 98 | # error: You must define IOMMU_ACTIVE in the configs file |
---|
| 99 | #endif |
---|
| 100 | |
---|
| 101 | |
---|
[189] | 102 | #define in_unckdata __attribute__((section (".unckdata"))) |
---|
[169] | 103 | |
---|
[158] | 104 | ////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 105 | // Timers driver |
---|
[158] | 106 | ////////////////////////////////////////////////////////////////////////////// |
---|
[203] | 107 | // The timers can be implemented in a vci_timer component or in a vci_xicu |
---|
[215] | 108 | // component (depending on the USE_XICU parameter). |
---|
[203] | 109 | // There is one timer (or xicu) component per cluster. |
---|
[189] | 110 | // There is two types of timers: |
---|
| 111 | // - "system" timers : one per processor, used for context switch. |
---|
| 112 | // local_id in [0, NB_PROCS_MAX-1], |
---|
| 113 | // - "user" timers : requested by the task in the mapping_info data structure. |
---|
[203] | 114 | // For each user timer, the timer_id is stored in the context of the task. |
---|
| 115 | // The global index is cluster_id * (NB_PROCS_MAX+NB_TIMERS_MAX) + local_id |
---|
[158] | 116 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 117 | |
---|
[189] | 118 | // User Timer signaling variables |
---|
| 119 | |
---|
| 120 | #if (NB_TIMERS_MAX > 0) |
---|
[228] | 121 | in_unckdata volatile unsigned char _user_timer_event[NB_CLUSTERS * NB_TIMERS_MAX] |
---|
[232] | 122 | = { [0 ... ((NB_CLUSTERS * NB_TIMERS_MAX) - 1)] = 0 }; |
---|
[189] | 123 | #endif |
---|
| 124 | |
---|
[158] | 125 | ////////////////////////////////////////////////////////////////////////////// |
---|
[203] | 126 | // _timer_start() |
---|
| 127 | // This function activates a timer in the vci_timer (or vci_xicu) component |
---|
| 128 | // by writing in the proper register the period value. |
---|
| 129 | // It can be used by both the kernel to initialise a "system" timer, |
---|
[189] | 130 | // or by a task (through a system call) to configure an "user" timer. |
---|
[158] | 131 | // Returns 0 if success, > 0 if error. |
---|
| 132 | ////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 133 | unsigned int _timer_start(unsigned int cluster_id, unsigned int local_id, unsigned int period) { |
---|
[165] | 134 | // parameters checking |
---|
[228] | 135 | if (cluster_id >= NB_CLUSTERS) { |
---|
| 136 | return 1; |
---|
| 137 | } |
---|
| 138 | if (local_id >= NB_TIMERS_MAX) { |
---|
| 139 | return 2; |
---|
| 140 | } |
---|
[158] | 141 | |
---|
[215] | 142 | #if USE_XICU |
---|
[228] | 143 | unsigned int * timer_address = (unsigned int *) ((char *) &seg_icu_base + (cluster_id * CLUSTER_SIZE)); |
---|
[158] | 144 | |
---|
[203] | 145 | timer_address[XICU_REG(XICU_PTI_PER, local_id)] = period; |
---|
[189] | 146 | #else |
---|
[228] | 147 | unsigned int* timer_address = (unsigned int *) ((char *) &seg_tim_base + (cluster_id * CLUSTER_SIZE)); |
---|
[189] | 148 | |
---|
[203] | 149 | timer_address[local_id * TIMER_SPAN + TIMER_PERIOD] = period; |
---|
[228] | 150 | timer_address[local_id * TIMER_SPAN + TIMER_MODE] = 0x3; |
---|
[189] | 151 | #endif |
---|
[158] | 152 | return 0; |
---|
| 153 | } |
---|
[228] | 154 | |
---|
| 155 | |
---|
[189] | 156 | ////////////////////////////////////////////////////////////////////////////// |
---|
[203] | 157 | // _timer_stop() |
---|
| 158 | // This function desactivates a timer in the vci_timer (or vci_xicu) component |
---|
| 159 | // by writing in the proper register. |
---|
[189] | 160 | // Returns 0 if success, > 0 if error. |
---|
| 161 | ////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 162 | unsigned int _timer_stop(unsigned int cluster_id, unsigned int local_id) { |
---|
[203] | 163 | // parameters checking |
---|
[228] | 164 | if (cluster_id >= NB_CLUSTERS) { |
---|
| 165 | return 1; |
---|
| 166 | } |
---|
| 167 | if (local_id >= NB_TIMERS_MAX) { |
---|
| 168 | return 2; |
---|
| 169 | } |
---|
[158] | 170 | |
---|
[215] | 171 | #if USE_XICU |
---|
[228] | 172 | unsigned int * timer_address = (unsigned int *) ((char *) &seg_icu_base + (cluster_id * CLUSTER_SIZE)); |
---|
[203] | 173 | |
---|
| 174 | timer_address[XICU_REG(XICU_PTI_PER, local_id)] = 0; |
---|
| 175 | #else |
---|
[228] | 176 | unsigned int* timer_address = (unsigned int *) ((char *) &seg_tim_base + (cluster_id * CLUSTER_SIZE)); |
---|
[203] | 177 | timer_address[local_id * TIMER_SPAN + TIMER_MODE] = 0; |
---|
| 178 | #endif |
---|
| 179 | return 0; |
---|
[189] | 180 | } |
---|
[228] | 181 | |
---|
| 182 | |
---|
[158] | 183 | ////////////////////////////////////////////////////////////////////////////// |
---|
[203] | 184 | // _timer_reset_irq() |
---|
| 185 | // This function acknowlegge a timer interrupt in the vci_timer (or vci_xicu) |
---|
[204] | 186 | // component by reading/writing in the proper register. |
---|
[203] | 187 | // It can be used by both the isr_switch() for a "system" timer, |
---|
| 188 | // or by the _isr_timer() for an "user" timer. |
---|
[158] | 189 | // Returns 0 if success, > 0 if error. |
---|
| 190 | ////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 191 | unsigned int _timer_reset_irq(unsigned int cluster_id, unsigned int local_id) { |
---|
[203] | 192 | // parameters checking |
---|
[228] | 193 | if (cluster_id >= NB_CLUSTERS) { |
---|
| 194 | return 1; |
---|
| 195 | } |
---|
| 196 | if (local_id >= NB_TIMERS_MAX) { |
---|
| 197 | return 2; |
---|
| 198 | } |
---|
[158] | 199 | |
---|
[215] | 200 | #if USE_XICU |
---|
[228] | 201 | unsigned int * timer_address = (unsigned int *) ((char *) &seg_icu_base + |
---|
| 202 | (cluster_id * (unsigned) CLUSTER_SIZE)); |
---|
[203] | 203 | |
---|
| 204 | unsigned int bloup = timer_address[XICU_REG(XICU_PTI_ACK, local_id)]; |
---|
[228] | 205 | bloup++; // to avoid a warning |
---|
[203] | 206 | #else |
---|
[232] | 207 | unsigned int * timer_address = (unsigned int *) ((char *) &seg_tim_base + |
---|
[228] | 208 | (cluster_id * CLUSTER_SIZE)); |
---|
[203] | 209 | |
---|
| 210 | timer_address[local_id * TIMER_SPAN + TIMER_RESETIRQ] = 0; |
---|
| 211 | #endif |
---|
| 212 | |
---|
| 213 | return 0; |
---|
[158] | 214 | } |
---|
| 215 | |
---|
[228] | 216 | |
---|
[232] | 217 | //////////////////////////////////////////////// |
---|
| 218 | // _timer_reset_irq_cpt() |
---|
| 219 | //////////////////////////////////////////////// |
---|
| 220 | //unsigned int _timer_reset_irq_cpt(unsigned int cluster_id, unsigned int local_id) { |
---|
| 221 | // // parameters checking |
---|
| 222 | // if ( cluster_id >= NB_CLUSTERS) return 1; |
---|
| 223 | // if ( local_id >= NB_TIMERS_MAX ) return 2; |
---|
| 224 | // |
---|
| 225 | //#if USE_XICU |
---|
| 226 | //#error // not implemented |
---|
| 227 | //#else |
---|
| 228 | // unsigned int * timer_address = (unsigned int *) ((char *) &seg_tim_base + (cluster_id * CLUSTER_SIZE)); |
---|
| 229 | // |
---|
| 230 | // timer_address[local_id * TIMER_SPAN + TIMER_RESETIRQ] = 1; |
---|
| 231 | //#endif |
---|
| 232 | // |
---|
| 233 | // return 0; |
---|
| 234 | //} |
---|
| 235 | |
---|
| 236 | |
---|
[158] | 237 | ///////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 238 | // VciMultiTty driver |
---|
[158] | 239 | ///////////////////////////////////////////////////////////////////////////////// |
---|
[189] | 240 | // There is only one multi_tty controler in the architecture. |
---|
[158] | 241 | // The total number of TTYs is defined by the configuration parameter NB_TTYS. |
---|
[189] | 242 | // The "system" terminal is TTY[0]. |
---|
| 243 | // The "user" TTYs are allocated to applications by the GIET in the boot phase, |
---|
| 244 | // as defined in the mapping_info data structure. The corresponding tty_id must |
---|
| 245 | // be stored in the context of the task by the boot code. |
---|
| 246 | // The TTY address is : seg_tty_base + tty_id*TTY_SPAN |
---|
| 247 | ///////////////////////////////////////////////////////////////////////////////// |
---|
[158] | 248 | |
---|
[189] | 249 | // TTY variables |
---|
| 250 | in_unckdata volatile unsigned char _tty_get_buf[NB_TTYS]; |
---|
[228] | 251 | in_unckdata volatile unsigned char _tty_get_full[NB_TTYS] = { [0 ... NB_TTYS - 1] = 0 }; |
---|
| 252 | in_unckdata unsigned int _tty_put_lock = 0; // protect kernel TTY[0] |
---|
[189] | 253 | |
---|
| 254 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 255 | // _tty_error() |
---|
| 256 | //////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 257 | void _tty_error(unsigned int tty_id, unsigned int task_id) { |
---|
[189] | 258 | unsigned int proc_id = _procid(); |
---|
| 259 | |
---|
| 260 | _get_lock(&_tty_put_lock); |
---|
[228] | 261 | if (tty_id == 0xFFFFFFFF) { |
---|
[226] | 262 | _puts("\n[GIET ERROR] no TTY assigned to the task "); |
---|
[228] | 263 | } |
---|
| 264 | else { |
---|
[226] | 265 | _puts("\n[GIET ERROR] TTY index too large for task "); |
---|
[228] | 266 | } |
---|
| 267 | _putd(task_id); |
---|
[189] | 268 | _puts(" on processor "); |
---|
[228] | 269 | _putd(proc_id); |
---|
[189] | 270 | _puts("\n"); |
---|
| 271 | _release_lock(&_tty_put_lock); |
---|
| 272 | } |
---|
[228] | 273 | |
---|
| 274 | |
---|
[189] | 275 | ///////////////////////////////////////////////////////////////////////////////// |
---|
| 276 | // _tty_write() |
---|
[158] | 277 | // Write one or several characters directly from a fixed-length user buffer to |
---|
| 278 | // the TTY_WRITE register of the TTY controler. |
---|
| 279 | // It doesn't use the TTY_PUT_IRQ interrupt and the associated kernel buffer. |
---|
| 280 | // This is a non blocking call: it tests the TTY_STATUS register, and stops |
---|
| 281 | // the transfer as soon as the TTY_STATUS[WRITE] bit is set. |
---|
| 282 | // The function returns the number of characters that have been written. |
---|
[189] | 283 | ///////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 284 | unsigned int _tty_write(const char * buffer, unsigned int length) { |
---|
| 285 | unsigned int nwritten; |
---|
[232] | 286 | unsigned int task_id = _get_proc_task_id(); |
---|
[228] | 287 | unsigned int tty_id = _get_context_slot(task_id, CTX_TTY_ID); |
---|
[158] | 288 | |
---|
[228] | 289 | if (tty_id >= NB_TTYS) { |
---|
| 290 | _tty_error(tty_id , task_id); |
---|
[189] | 291 | return 0; |
---|
| 292 | } |
---|
[158] | 293 | |
---|
[228] | 294 | unsigned int * tty_address = (unsigned int *) &seg_tty_base; |
---|
[158] | 295 | |
---|
[228] | 296 | for (nwritten = 0; nwritten < length; nwritten++) { |
---|
[165] | 297 | // check tty's status |
---|
[228] | 298 | if ((tty_address[tty_id * TTY_SPAN + TTY_STATUS] & 0x2) == 0x2) { |
---|
[158] | 299 | break; |
---|
[228] | 300 | } |
---|
| 301 | else { |
---|
[165] | 302 | // write character |
---|
[228] | 303 | tty_address[tty_id * TTY_SPAN + TTY_WRITE] = (unsigned int) buffer[nwritten]; |
---|
| 304 | } |
---|
[158] | 305 | } |
---|
| 306 | return nwritten; |
---|
| 307 | } |
---|
[228] | 308 | |
---|
| 309 | |
---|
[158] | 310 | ////////////////////////////////////////////////////////////////////////////// |
---|
[204] | 311 | // _tty_read() |
---|
[158] | 312 | // This non-blocking function uses the TTY_GET_IRQ[tty_id] interrupt and |
---|
[165] | 313 | // the associated kernel buffer, that has been written by the ISR. |
---|
[204] | 314 | // It get the TTY terminal index from the context of the current task. |
---|
[158] | 315 | // It fetches one single character from the _tty_get_buf[tty_id] kernel |
---|
| 316 | // buffer, writes this character to the user buffer, and resets the |
---|
| 317 | // _tty_get_full[tty_id] buffer. |
---|
[204] | 318 | // The length argument is not used. |
---|
[158] | 319 | // Returns 0 if the kernel buffer is empty, 1 if the buffer is full. |
---|
| 320 | ////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 321 | unsigned int _tty_read(char * buffer, unsigned int length) { |
---|
[232] | 322 | unsigned int task_id = _get_proc_task_id(); |
---|
[228] | 323 | unsigned int tty_id = _get_context_slot(task_id, CTX_TTY_ID); |
---|
[158] | 324 | |
---|
[228] | 325 | if (tty_id >= NB_TTYS) { |
---|
| 326 | _tty_error(tty_id, task_id); |
---|
[189] | 327 | return 0; |
---|
| 328 | } |
---|
[158] | 329 | |
---|
[228] | 330 | if (_tty_get_full[tty_id] == 0) { |
---|
[189] | 331 | return 0; |
---|
[158] | 332 | } |
---|
[228] | 333 | else { |
---|
[158] | 334 | *buffer = _tty_get_buf[tty_id]; |
---|
| 335 | _tty_get_full[tty_id] = 0; |
---|
[189] | 336 | return 1; |
---|
[158] | 337 | } |
---|
[228] | 338 | } |
---|
| 339 | |
---|
| 340 | |
---|
[158] | 341 | //////////////////////////////////////////////////////////////////////////////// |
---|
[204] | 342 | // _tty_get_char() |
---|
| 343 | // This function is used by the _isr_tty to read a character in the TTY |
---|
| 344 | // terminal defined by the tty_id argument. The character is stored |
---|
| 345 | // in requested buffer, and the IRQ is acknowledged. |
---|
| 346 | // Returns 0 if success, 1 if tty_id too large. |
---|
[158] | 347 | //////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 348 | unsigned int _tty_get_char(unsigned int tty_id, unsigned char * buffer) { |
---|
[204] | 349 | // checking argument |
---|
[228] | 350 | if (tty_id >= NB_TTYS) { |
---|
| 351 | return 1; |
---|
| 352 | } |
---|
[199] | 353 | |
---|
[204] | 354 | // compute terminal base address |
---|
[228] | 355 | unsigned int * tty_address = (unsigned int *) &seg_tty_base; |
---|
[158] | 356 | |
---|
[228] | 357 | *buffer = (unsigned char) tty_address[tty_id * TTY_SPAN + TTY_READ]; |
---|
[204] | 358 | return 0; |
---|
[158] | 359 | } |
---|
| 360 | |
---|
[228] | 361 | |
---|
[158] | 362 | //////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 363 | // VciMultiIcu and VciXicu drivers |
---|
[158] | 364 | //////////////////////////////////////////////////////////////////////////////// |
---|
[203] | 365 | // There is one vci_multi_icu (or vci_xicu) component per cluster, |
---|
| 366 | // and the number of independant ICUs is equal to NB_PROCS_MAX, |
---|
| 367 | // because there is one private interrupr controler per processor. |
---|
[158] | 368 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 369 | |
---|
| 370 | //////////////////////////////////////////////////////////////////////////////// |
---|
[203] | 371 | // _icu_set_mask() |
---|
| 372 | // This function can be used with both the vci_xicu & vci_multi_icu components. |
---|
| 373 | // It set the mask register for the ICU channel identified by the cluster index |
---|
| 374 | // and the processor index: all '1' bits are set / all '0' bits are not modified. |
---|
[158] | 375 | // Returns 0 if success, > 0 if error. |
---|
| 376 | //////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 377 | unsigned int _icu_set_mask( |
---|
| 378 | unsigned int cluster_id, |
---|
| 379 | unsigned int proc_id, |
---|
| 380 | unsigned int value, |
---|
| 381 | unsigned int is_timer) { |
---|
[203] | 382 | // parameters checking |
---|
[228] | 383 | if (cluster_id >= NB_CLUSTERS) { |
---|
| 384 | return 1; |
---|
| 385 | } |
---|
| 386 | if (proc_id >= NB_PROCS_MAX) { |
---|
| 387 | return 1; |
---|
| 388 | } |
---|
[203] | 389 | |
---|
[228] | 390 | unsigned int * icu_address = (unsigned int *) ((char *) &seg_icu_base + |
---|
| 391 | (cluster_id * (unsigned) CLUSTER_SIZE)); |
---|
[215] | 392 | #if USE_XICU |
---|
[228] | 393 | if (is_timer) { |
---|
| 394 | icu_address[XICU_REG(XICU_MSK_PTI_ENABLE, proc_id)] = value; |
---|
| 395 | } |
---|
| 396 | else { |
---|
| 397 | icu_address[XICU_REG(XICU_MSK_HWI_ENABLE, proc_id)] = value; |
---|
| 398 | } |
---|
[189] | 399 | #else |
---|
[203] | 400 | icu_address[proc_id * ICU_SPAN + ICU_MASK_SET] = value; |
---|
| 401 | #endif |
---|
[189] | 402 | |
---|
[158] | 403 | return 0; |
---|
| 404 | } |
---|
[228] | 405 | |
---|
| 406 | |
---|
[158] | 407 | //////////////////////////////////////////////////////////////////////////////// |
---|
[203] | 408 | // _icu_get_index() |
---|
| 409 | // This function can be used with both the vci_xicu & vci_multi_icu components. |
---|
| 410 | // It returns the index of the highest priority (smaller index) active HWI. |
---|
| 411 | // The ICU channel is identified by the cluster index and the processor index. |
---|
[158] | 412 | // Returns 0 if success, > 0 if error. |
---|
| 413 | //////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 414 | unsigned int _icu_get_index(unsigned int cluster_id, unsigned int proc_id, unsigned int * buffer) { |
---|
[203] | 415 | // parameters checking |
---|
[228] | 416 | if (cluster_id >= NB_CLUSTERS) { |
---|
| 417 | return 1; |
---|
| 418 | } |
---|
| 419 | if (proc_id >= NB_PROCS_MAX) { |
---|
| 420 | return 1; |
---|
| 421 | } |
---|
[203] | 422 | |
---|
[228] | 423 | unsigned int * icu_address = (unsigned int *) ((char *) &seg_icu_base + |
---|
| 424 | (cluster_id * (unsigned) CLUSTER_SIZE)); |
---|
[215] | 425 | #if USE_XICU |
---|
[228] | 426 | unsigned int prio = icu_address[XICU_REG(XICU_PRIO, proc_id)]; |
---|
[203] | 427 | unsigned int pti_ok = (prio & 0x00000001); |
---|
| 428 | unsigned int hwi_ok = (prio & 0x00000002); |
---|
| 429 | unsigned int swi_ok = (prio & 0x00000004); |
---|
| 430 | unsigned int pti_id = (prio & 0x00001F00) >> 8; |
---|
| 431 | unsigned int hwi_id = (prio & 0x001F0000) >> 16; |
---|
| 432 | unsigned int swi_id = (prio & 0x1F000000) >> 24; |
---|
[228] | 433 | if (pti_ok) { |
---|
| 434 | *buffer = pti_id; |
---|
| 435 | } |
---|
| 436 | else if (hwi_ok) { |
---|
| 437 | *buffer = hwi_id; |
---|
| 438 | } |
---|
| 439 | else if (swi_ok) { |
---|
| 440 | *buffer = swi_id; |
---|
| 441 | } |
---|
| 442 | else { |
---|
| 443 | *buffer = 32; |
---|
| 444 | } |
---|
[189] | 445 | #else |
---|
[203] | 446 | *buffer = icu_address[proc_id * ICU_SPAN + ICU_IT_VECTOR]; |
---|
| 447 | #endif |
---|
[189] | 448 | |
---|
[158] | 449 | return 0; |
---|
| 450 | } |
---|
| 451 | |
---|
[228] | 452 | |
---|
[158] | 453 | //////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 454 | // VciGcd driver |
---|
[158] | 455 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 456 | // The Greater Dommon Divider is a -very- simple hardware coprocessor |
---|
[165] | 457 | // performing the computation of the GCD of two 32 bits integers. |
---|
[158] | 458 | // It has no DMA capability. |
---|
| 459 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 460 | |
---|
| 461 | //////////////////////////////////////////////////////////////////////////////// |
---|
[189] | 462 | // _gcd_write() |
---|
[158] | 463 | // Write a 32-bit word in a memory mapped register of the GCD coprocessor. |
---|
| 464 | // Returns 0 if success, > 0 if error. |
---|
| 465 | //////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 466 | unsigned int _gcd_write(unsigned int register_index, unsigned int value) { |
---|
[165] | 467 | // parameters checking |
---|
[228] | 468 | if (register_index >= GCD_END) { |
---|
[158] | 469 | return 1; |
---|
[228] | 470 | } |
---|
[158] | 471 | |
---|
[228] | 472 | unsigned int * gcd_address = (unsigned int *) &seg_gcd_base; |
---|
[165] | 473 | |
---|
| 474 | gcd_address[register_index] = value; // write word |
---|
[158] | 475 | return 0; |
---|
| 476 | } |
---|
[228] | 477 | |
---|
| 478 | |
---|
[158] | 479 | //////////////////////////////////////////////////////////////////////////////// |
---|
[189] | 480 | // _gcd_read() |
---|
[158] | 481 | // Read a 32-bit word in a memory mapped register of the GCD coprocessor. |
---|
| 482 | // Returns 0 if success, > 0 if error. |
---|
| 483 | //////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 484 | unsigned int _gcd_read(unsigned int register_index, unsigned int * buffer) { |
---|
[165] | 485 | // parameters checking |
---|
[228] | 486 | if (register_index >= GCD_END) { |
---|
[158] | 487 | return 1; |
---|
[228] | 488 | } |
---|
[158] | 489 | |
---|
[228] | 490 | unsigned int * gcd_address = (unsigned int *) &seg_gcd_base; |
---|
[165] | 491 | |
---|
| 492 | *buffer = gcd_address[register_index]; // read word |
---|
[158] | 493 | return 0; |
---|
| 494 | } |
---|
| 495 | |
---|
| 496 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 497 | // VciBlockDevice driver |
---|
| 498 | //////////////////////////////////////////////////////////////////////////////// |
---|
[165] | 499 | // The VciBlockDevice is a single channel external storage contrÃŽler. |
---|
[166] | 500 | // |
---|
| 501 | // The IOMMU can be activated or not: |
---|
| 502 | // |
---|
| 503 | // 1) When the IOMMU is used, a fixed size 2Mbytes vseg is allocated to |
---|
| 504 | // the IOC peripheral, in the I/O virtual space, and the user buffer is |
---|
| 505 | // dynamically remapped in the IOMMU page table. The corresponding entry |
---|
| 506 | // in the IOMMU PT1 is defined by the kernel _ioc_iommu_ix1 variable. |
---|
| 507 | // The number of pages to be unmapped is stored in the _ioc_npages variable. |
---|
| 508 | // The number of PT2 entries is dynamically computed and stored in the |
---|
| 509 | // kernel _ioc_iommu_npages variable. It cannot be larger than 512. |
---|
| 510 | // The user buffer is unmapped by the _ioc_completed() function when |
---|
| 511 | // the transfer is completed. |
---|
| 512 | // |
---|
| 513 | // 2/ If the IOMMU is not used, we check that the user buffer is mapped to a |
---|
| 514 | // contiguous physical buffer (this is generally true because the user space |
---|
| 515 | // page tables are statically constructed to use contiguous physical memory). |
---|
| 516 | // |
---|
| 517 | // Finally, the memory buffer must fulfill the following conditions: |
---|
| 518 | // - The user buffer must be word aligned, |
---|
| 519 | // - The user buffer must be mapped in user address space, |
---|
| 520 | // - The user buffer must be writable in case of (to_mem) access, |
---|
| 521 | // - The total number of physical pages occupied by the user buffer cannot |
---|
| 522 | // be larger than 512 pages if the IOMMU is activated, |
---|
| 523 | // - All physical pages occupied by the user buffer must be contiguous |
---|
| 524 | // if the IOMMU is not activated. |
---|
| 525 | // An error code is returned if these conditions are not verified. |
---|
| 526 | // |
---|
[158] | 527 | // As the IOC component can be used by several programs running in parallel, |
---|
| 528 | // the _ioc_lock variable guaranties exclusive access to the device. The |
---|
| 529 | // _ioc_read() and _ioc_write() functions use atomic LL/SC to get the lock. |
---|
| 530 | // and set _ioc_lock to a non zero value. The _ioc_write() and _ioc_read() |
---|
| 531 | // functions are blocking, polling the _ioc_lock variable until the device is |
---|
| 532 | // available. |
---|
| 533 | // When the tranfer is completed, the ISR routine activated by the IOC IRQ |
---|
| 534 | // set the _ioc_done variable to a non-zero value. Possible address errors |
---|
| 535 | // detected by the IOC peripheral are reported by the ISR in the _ioc_status |
---|
| 536 | // variable. |
---|
| 537 | // The _ioc_completed() function is polling the _ioc_done variable, waiting for |
---|
[166] | 538 | // transfer completion. When the completion is signaled, the _ioc_completed() |
---|
[158] | 539 | // function reset the _ioc_done variable to zero, and releases the _ioc_lock |
---|
| 540 | // variable. |
---|
| 541 | // |
---|
| 542 | // In a multi-processing environment, this polling policy should be replaced by |
---|
| 543 | // a descheduling policy for the requesting process. |
---|
| 544 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 545 | |
---|
[189] | 546 | // IOC global variables |
---|
[228] | 547 | in_unckdata volatile unsigned int _ioc_status= 0; |
---|
| 548 | in_unckdata volatile unsigned int _ioc_done = 0; |
---|
| 549 | in_unckdata unsigned int _ioc_lock = 0; |
---|
| 550 | in_unckdata unsigned int _ioc_iommu_ix1 = 0; |
---|
| 551 | in_unckdata unsigned int _ioc_iommu_npages; |
---|
[158] | 552 | |
---|
| 553 | /////////////////////////////////////////////////////////////////////////////// |
---|
[189] | 554 | // _ioc_access() |
---|
[166] | 555 | // This function transfer data between a memory buffer and the block device. |
---|
| 556 | // The buffer lentgth is (count*block_size) bytes. |
---|
| 557 | // Arguments are: |
---|
| 558 | // - to_mem : from external storage to memory when non 0 |
---|
| 559 | // - lba : first block index on the external storage. |
---|
| 560 | // - user_vaddr : virtual base address of the memory buffer. |
---|
| 561 | // - count : number of blocks to be transfered. |
---|
[158] | 562 | // Returns 0 if success, > 0 if error. |
---|
| 563 | /////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 564 | unsigned int _ioc_access( |
---|
| 565 | unsigned int to_mem, |
---|
| 566 | unsigned int lba, |
---|
| 567 | unsigned int user_vaddr, |
---|
| 568 | unsigned int count) { |
---|
| 569 | unsigned int user_vpn_min; // first virtuel page index in user space |
---|
| 570 | unsigned int user_vpn_max; // last virtual page index in user space |
---|
| 571 | unsigned int vpn; // current virtual page index in user space |
---|
| 572 | unsigned int ppn; // physical page number |
---|
| 573 | unsigned int flags; // page protection flags |
---|
| 574 | unsigned int ix2; // page index in IOMMU PT1 page table |
---|
| 575 | unsigned int addr; // buffer address for IOC peripheral |
---|
| 576 | unsigned int ppn_first; // first physical page number for user buffer |
---|
| 577 | |
---|
[166] | 578 | // check buffer alignment |
---|
[228] | 579 | if ((unsigned int) user_vaddr & 0x3) { |
---|
| 580 | return 1; |
---|
| 581 | } |
---|
[158] | 582 | |
---|
[228] | 583 | unsigned int * ioc_address = (unsigned int *) &seg_ioc_base ; |
---|
[204] | 584 | |
---|
[228] | 585 | unsigned int block_size = ioc_address[BLOCK_DEVICE_BLOCK_SIZE]; |
---|
| 586 | unsigned int length = count * block_size; |
---|
[158] | 587 | |
---|
[167] | 588 | // get user space page table virtual address |
---|
[232] | 589 | unsigned int task_id = _get_proc_task_id(); |
---|
[228] | 590 | unsigned int user_pt_vbase = _get_context_slot(task_id, CTX_PTAB_ID); |
---|
| 591 | |
---|
[166] | 592 | user_vpn_min = user_vaddr >> 12; |
---|
| 593 | user_vpn_max = (user_vaddr + length - 1) >> 12; |
---|
[228] | 594 | ix2 = 0; |
---|
[158] | 595 | |
---|
[166] | 596 | // loop on all virtual pages covering the user buffer |
---|
[228] | 597 | for (vpn = user_vpn_min; vpn <= user_vpn_max; vpn++) { |
---|
[166] | 598 | // get ppn and flags for each vpn |
---|
[228] | 599 | unsigned int ko = _v2p_translate((page_table_t *) user_pt_vbase, vpn, &ppn, &flags); |
---|
[158] | 600 | |
---|
[166] | 601 | // check access rights |
---|
[228] | 602 | if (ko) { |
---|
| 603 | return 2; // unmapped |
---|
| 604 | } |
---|
| 605 | if ((flags & PTE_U) == 0) { |
---|
| 606 | return 3; // not in user space |
---|
| 607 | } |
---|
| 608 | if (((flags & PTE_W) == 0 ) && to_mem) { |
---|
| 609 | return 4; // not writable |
---|
| 610 | } |
---|
[158] | 611 | |
---|
[166] | 612 | // save first ppn value |
---|
[228] | 613 | if (ix2 == 0) { |
---|
| 614 | ppn_first = ppn; |
---|
| 615 | } |
---|
[158] | 616 | |
---|
[228] | 617 | if (IOMMU_ACTIVE) { |
---|
| 618 | // the user buffer must be remapped in the I/0 space |
---|
[166] | 619 | // check buffer length < 2 Mbytes |
---|
[228] | 620 | if (ix2 > 511) { |
---|
| 621 | return 2; |
---|
| 622 | } |
---|
[158] | 623 | |
---|
[166] | 624 | // map the physical page in IOMMU page table |
---|
[228] | 625 | _iommu_add_pte2( |
---|
| 626 | _ioc_iommu_ix1, // PT1 index |
---|
| 627 | ix2, // PT2 index |
---|
| 628 | ppn, // Physical page number |
---|
| 629 | flags); // Protection flags |
---|
[166] | 630 | } |
---|
[228] | 631 | else { |
---|
| 632 | // no IOMMU : check that physical pages are contiguous |
---|
| 633 | if ((ppn - ppn_first) != ix2) { |
---|
| 634 | return 5; // split physical buffer |
---|
| 635 | } |
---|
[166] | 636 | } |
---|
[228] | 637 | |
---|
[166] | 638 | // increment page index |
---|
| 639 | ix2++; |
---|
| 640 | } // end for vpn |
---|
[158] | 641 | |
---|
[166] | 642 | // register the number of pages to be unmapped |
---|
| 643 | _ioc_iommu_npages = (user_vpn_max - user_vpn_min) + 1; |
---|
[158] | 644 | |
---|
[166] | 645 | // invalidate data cache in case of memory write |
---|
[228] | 646 | if (to_mem) { |
---|
| 647 | _dcache_buf_invalidate((void *) user_vaddr, length); |
---|
| 648 | } |
---|
[158] | 649 | |
---|
[166] | 650 | // compute buffer base address for IOC depending on IOMMU activation |
---|
[228] | 651 | if (IOMMU_ACTIVE) { |
---|
| 652 | addr = (_ioc_iommu_ix1) << 21 | (user_vaddr & 0xFFF); |
---|
| 653 | } |
---|
| 654 | else { |
---|
| 655 | addr = (ppn_first << 12) | (user_vaddr & 0xFFF); |
---|
| 656 | } |
---|
[166] | 657 | |
---|
| 658 | // get the lock on ioc device |
---|
[228] | 659 | _get_lock(&_ioc_lock); |
---|
[158] | 660 | |
---|
[166] | 661 | // peripheral configuration |
---|
[228] | 662 | ioc_address[BLOCK_DEVICE_BUFFER] = addr; |
---|
| 663 | ioc_address[BLOCK_DEVICE_COUNT] = count; |
---|
| 664 | ioc_address[BLOCK_DEVICE_LBA] = lba; |
---|
| 665 | if (to_mem == 0) { |
---|
| 666 | ioc_address[BLOCK_DEVICE_OP] = BLOCK_DEVICE_WRITE; |
---|
| 667 | } |
---|
| 668 | else { |
---|
| 669 | ioc_address[BLOCK_DEVICE_OP] = BLOCK_DEVICE_READ; |
---|
| 670 | } |
---|
[158] | 671 | |
---|
| 672 | return 0; |
---|
| 673 | } |
---|
[228] | 674 | |
---|
| 675 | |
---|
[158] | 676 | ///////////////////////////////////////////////////////////////////////////////// |
---|
| 677 | // _ioc_completed() |
---|
| 678 | // |
---|
| 679 | // This function checks completion of an I/O transfer and reports errors. |
---|
[166] | 680 | // As it is a blocking call, the processor is stalled. |
---|
| 681 | // If the virtual memory is activated, the pages mapped in the I/O virtual |
---|
| 682 | // space are unmapped, and the IOB TLB is cleared. |
---|
[158] | 683 | // Returns 0 if success, > 0 if error. |
---|
| 684 | ///////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 685 | unsigned int _ioc_completed() { |
---|
| 686 | unsigned int ret; |
---|
| 687 | unsigned int ix2; |
---|
[158] | 688 | |
---|
[166] | 689 | // busy waiting |
---|
[228] | 690 | while (_ioc_done == 0) { |
---|
[158] | 691 | asm volatile("nop"); |
---|
[228] | 692 | } |
---|
[158] | 693 | |
---|
[166] | 694 | // unmap the buffer from IOMMU page table if IOMMU is activated |
---|
[228] | 695 | if (IOMMU_ACTIVE) { |
---|
| 696 | unsigned int * iob_address = (unsigned int *) &seg_iob_base; |
---|
[166] | 697 | |
---|
[228] | 698 | for (ix2 = 0; ix2 < _ioc_iommu_npages; ix2++) { |
---|
[166] | 699 | // unmap the page in IOMMU page table |
---|
[228] | 700 | _iommu_inval_pte2( |
---|
| 701 | _ioc_iommu_ix1, // PT1 index |
---|
| 702 | ix2 ); // PT2 index |
---|
[166] | 703 | |
---|
| 704 | // clear IOMMU TLB |
---|
[169] | 705 | iob_address[IOB_INVAL_PTE] = (_ioc_iommu_ix1 << 21) | (ix2 << 12); |
---|
[166] | 706 | } |
---|
| 707 | } |
---|
| 708 | |
---|
| 709 | // test IOC status |
---|
[158] | 710 | if ((_ioc_status != BLOCK_DEVICE_READ_SUCCESS) |
---|
[228] | 711 | && (_ioc_status != BLOCK_DEVICE_WRITE_SUCCESS)) { |
---|
| 712 | ret = 1; // error |
---|
| 713 | } |
---|
| 714 | else { |
---|
| 715 | ret = 0; // success |
---|
| 716 | } |
---|
[158] | 717 | |
---|
[166] | 718 | // reset synchronization variables |
---|
[223] | 719 | _ioc_done = 0; |
---|
[228] | 720 | asm volatile("sync"); |
---|
[223] | 721 | _ioc_lock = 0; |
---|
[158] | 722 | |
---|
| 723 | return ret; |
---|
| 724 | } |
---|
[228] | 725 | |
---|
| 726 | |
---|
[166] | 727 | /////////////////////////////////////////////////////////////////////////////// |
---|
[189] | 728 | // _ioc_read() |
---|
[166] | 729 | // Transfer data from the block device to a memory buffer in user space. |
---|
| 730 | // - lba : first block index on the block device |
---|
| 731 | // - buffer : base address of the memory buffer (must be word aligned) |
---|
| 732 | // - count : number of blocks to be transfered. |
---|
| 733 | // Returns 0 if success, > 0 if error. |
---|
| 734 | /////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 735 | unsigned int _ioc_read(unsigned int lba, void * buffer, unsigned int count) { |
---|
| 736 | return _ioc_access( |
---|
| 737 | 1, // read access |
---|
| 738 | lba, |
---|
| 739 | (unsigned int) buffer, |
---|
| 740 | count); |
---|
[166] | 741 | } |
---|
[228] | 742 | |
---|
| 743 | |
---|
[166] | 744 | /////////////////////////////////////////////////////////////////////////////// |
---|
[189] | 745 | // _ioc_write() |
---|
[166] | 746 | // Transfer data from a memory buffer in user space to the block device. |
---|
| 747 | // - lba : first block index on the block device |
---|
| 748 | // - buffer : base address of the memory buffer (must be word aligned) |
---|
| 749 | // - count : number of blocks to be transfered. |
---|
| 750 | // Returns 0 if success, > 0 if error. |
---|
| 751 | /////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 752 | unsigned int _ioc_write(unsigned int lba, const void * buffer, unsigned int count) { |
---|
| 753 | return _ioc_access( |
---|
| 754 | 0, // write access |
---|
| 755 | lba, |
---|
| 756 | (unsigned int) buffer, |
---|
| 757 | count); |
---|
[166] | 758 | } |
---|
[228] | 759 | |
---|
| 760 | |
---|
[204] | 761 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 762 | // _ioc_get_status() |
---|
| 763 | // This function returns the transfert status, and acknowledge the IRQ. |
---|
| 764 | // Returns 0 if success, > 0 if error. |
---|
| 765 | /////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 766 | unsigned int _ioc_get_status(unsigned int * status) { |
---|
[204] | 767 | // get IOC base address |
---|
[228] | 768 | unsigned int * ioc_address = (unsigned int *) &seg_ioc_base; |
---|
[166] | 769 | |
---|
[204] | 770 | *status = ioc_address[BLOCK_DEVICE_STATUS]; // read status & reset IRQ |
---|
| 771 | return 0; |
---|
| 772 | } |
---|
| 773 | |
---|
[228] | 774 | |
---|
[158] | 775 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[189] | 776 | // VciMultiDma driver |
---|
| 777 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 778 | // The DMA controllers are physically distributed in the clusters. |
---|
| 779 | // There is (NB_CLUSTERS * NB_DMAS_MAX) channels, indexed by a global index: |
---|
| 780 | // dma_id = cluster_id * NB_DMA_MAX + loc_id |
---|
| 781 | // |
---|
| 782 | // As a DMA channel can be used by several tasks, each DMA channel is protected |
---|
| 783 | // by a specific lock: _dma_lock[dma_id] |
---|
| 784 | // The signalisation between the OS and the DMA uses the _dma_done[dma_id] |
---|
| 785 | // synchronisation variables (set by the ISR, and reset by the OS). |
---|
| 786 | // The transfer status is copied by the ISR in the _dma_status[dma_id] variables. |
---|
| 787 | // |
---|
| 788 | // These DMA channels can be used by the FB driver, or by the NIC driver. |
---|
| 789 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 790 | |
---|
[213] | 791 | #if NB_DMAS_MAX > 0 |
---|
[228] | 792 | in_unckdata unsigned int _dma_lock[NB_DMAS_MAX * NB_CLUSTERS] = { |
---|
| 793 | [0 ... (NB_DMAS_MAX * NB_CLUSTERS) - 1] = 0 |
---|
| 794 | }; |
---|
[189] | 795 | |
---|
[228] | 796 | in_unckdata volatile unsigned int _dma_done[NB_DMAS_MAX * NB_CLUSTERS] = { |
---|
| 797 | [0 ... (NB_DMAS_MAX * NB_CLUSTERS) - 1] = 0 |
---|
| 798 | }; |
---|
[189] | 799 | |
---|
[228] | 800 | in_unckdata volatile unsigned int _dma_status[NB_DMAS_MAX * NB_CLUSTERS]; |
---|
| 801 | in_unckdata unsigned int _dma_iommu_ix1 = 1; |
---|
| 802 | in_unckdata unsigned int _dma_iommu_npages[NB_DMAS_MAX * NB_CLUSTERS]; |
---|
[213] | 803 | #endif |
---|
[189] | 804 | |
---|
| 805 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[204] | 806 | // _dma_reset_irq() |
---|
| 807 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 808 | unsigned int _dma_reset_irq(unsigned int cluster_id, unsigned int channel_id) { |
---|
[213] | 809 | #if NB_DMAS_MAX > 0 |
---|
[204] | 810 | // parameters checking |
---|
[228] | 811 | if (cluster_id >= NB_CLUSTERS) { |
---|
| 812 | return 1; |
---|
| 813 | } |
---|
| 814 | if (channel_id >= NB_DMAS_MAX) { |
---|
| 815 | return 1; |
---|
| 816 | } |
---|
[204] | 817 | |
---|
| 818 | // compute DMA base address |
---|
[228] | 819 | unsigned int * dma_address = (unsigned int *) ((char *) &seg_dma_base + |
---|
| 820 | (cluster_id * (unsigned) CLUSTER_SIZE)); |
---|
[204] | 821 | |
---|
[228] | 822 | dma_address[channel_id * DMA_SPAN + DMA_RESET] = 0; |
---|
[204] | 823 | return 0; |
---|
[213] | 824 | #else |
---|
| 825 | return -1; |
---|
| 826 | #endif |
---|
[204] | 827 | } |
---|
[218] | 828 | |
---|
[228] | 829 | |
---|
[204] | 830 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 831 | // _dma_get_status() |
---|
| 832 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 833 | unsigned int _dma_get_status(unsigned int cluster_id, unsigned int channel_id, unsigned int * status) { |
---|
[213] | 834 | #if NB_DMAS_MAX > 0 |
---|
[204] | 835 | // parameters checking |
---|
[228] | 836 | if (cluster_id >= NB_CLUSTERS) { |
---|
| 837 | return 1; |
---|
| 838 | } |
---|
| 839 | if (channel_id >= NB_DMAS_MAX) { |
---|
| 840 | return 1; |
---|
| 841 | } |
---|
[204] | 842 | |
---|
| 843 | // compute DMA base address |
---|
[228] | 844 | unsigned int * dma_address = (unsigned int *) ((char *) &seg_dma_base + |
---|
| 845 | (cluster_id * (unsigned) CLUSTER_SIZE)); |
---|
[207] | 846 | |
---|
[228] | 847 | *status = dma_address[channel_id * DMA_SPAN + DMA_LEN]; |
---|
[204] | 848 | return 0; |
---|
[213] | 849 | #else |
---|
| 850 | return -1; |
---|
| 851 | #endif |
---|
[204] | 852 | } |
---|
| 853 | |
---|
[228] | 854 | |
---|
[204] | 855 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[218] | 856 | // _dma_transfer() |
---|
| 857 | // Transfer data between a user buffer and a device buffer using DMA. |
---|
| 858 | // Two devices types are supported: Frame Buffer if dev_type == 0 |
---|
| 859 | // Multi-Nic if dev_type != 0 |
---|
| 860 | // Arguments are: |
---|
| 861 | // - dev_type : device type. |
---|
| 862 | // - to_user : from device buffer to user buffer when true. |
---|
| 863 | // - offset : offset (in bytes) in the device buffer. |
---|
| 864 | // - user_vaddr : virtual base address of the user buffer. |
---|
| 865 | // - length : number of bytes to be transfered. |
---|
| 866 | // |
---|
| 867 | // The DMA channel is obtained from task context (CTX_FBDMA_ID / CTX_NIDMA_ID. |
---|
[207] | 868 | // The user buffer must be mapped in user address space and word-aligned. |
---|
[169] | 869 | // The user buffer length must be multiple of 4 bytes. |
---|
[218] | 870 | // Me must compute the physical base addresses for both the device buffer |
---|
[189] | 871 | // and the user buffer before programming the DMA transfer. |
---|
[207] | 872 | // The GIET being fully static, we don't need to split the transfer in 4 Kbytes |
---|
[189] | 873 | // pages, because the user buffer is contiguous in physical space. |
---|
[158] | 874 | // Returns 0 if success, > 0 if error. |
---|
| 875 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 876 | unsigned int _dma_transfer( |
---|
| 877 | unsigned int dev_type, |
---|
| 878 | unsigned int to_user, |
---|
| 879 | unsigned int offset, |
---|
| 880 | unsigned int user_vaddr, |
---|
| 881 | unsigned int length) { |
---|
[213] | 882 | #if NB_DMAS_MAX > 0 |
---|
[228] | 883 | unsigned int ko; // unsuccessfull V2P translation |
---|
| 884 | unsigned int flags; // protection flags |
---|
| 885 | unsigned int ppn; // physical page number |
---|
| 886 | unsigned int user_pbase; // user buffer pbase address |
---|
| 887 | unsigned int device_pbase; // frame buffer pbase address |
---|
| 888 | unsigned int device_vaddr; // device buffer vbase address |
---|
[158] | 889 | |
---|
[189] | 890 | // check user buffer address and length alignment |
---|
[228] | 891 | if ((user_vaddr & 0x3) || (length & 0x3)) { |
---|
[203] | 892 | _get_lock(&_tty_put_lock); |
---|
[218] | 893 | _puts("\n[GIET ERROR] in _dma_transfer : user buffer not word aligned\n"); |
---|
[203] | 894 | _release_lock(&_tty_put_lock); |
---|
[189] | 895 | return 1; |
---|
| 896 | } |
---|
[169] | 897 | |
---|
[218] | 898 | // get DMA channel and compute DMA vbase address |
---|
[232] | 899 | unsigned int task_id = _get_proc_task_id(); |
---|
[228] | 900 | unsigned int dma_id = _get_context_slot(task_id, CTX_DMA_ID); |
---|
| 901 | unsigned int cluster_id = dma_id / NB_DMAS_MAX; |
---|
| 902 | unsigned int loc_id = dma_id % NB_DMAS_MAX; |
---|
| 903 | unsigned int * dma_base = (unsigned int *) ((char *) &seg_dma_base + |
---|
| 904 | (cluster_id * (unsigned) CLUSTER_SIZE)); |
---|
[218] | 905 | |
---|
| 906 | // get page table address |
---|
[228] | 907 | unsigned int user_ptab = _get_context_slot( task_id, CTX_PTAB_ID); |
---|
[169] | 908 | |
---|
[218] | 909 | // get peripheral buffer virtual address |
---|
[228] | 910 | if ( dev_type) { |
---|
| 911 | device_vaddr = (unsigned int) &seg_nic_base + offset; |
---|
| 912 | } |
---|
| 913 | else { |
---|
| 914 | device_vaddr = (unsigned int) &seg_fbf_base + offset; |
---|
| 915 | } |
---|
[189] | 916 | |
---|
[218] | 917 | // get device buffer physical address |
---|
[228] | 918 | ko = _v2p_translate((page_table_t *) user_ptab, (device_vaddr >> 12), &ppn, &flags); |
---|
| 919 | if (ko) { |
---|
[203] | 920 | _get_lock(&_tty_put_lock); |
---|
[218] | 921 | _puts("\n[GIET ERROR] in _dma_transfer : device buffer unmapped\n"); |
---|
[203] | 922 | _release_lock(&_tty_put_lock); |
---|
[189] | 923 | return 2; |
---|
| 924 | } |
---|
[218] | 925 | device_pbase = (ppn << 12) | (device_vaddr & 0x00000FFF); |
---|
[189] | 926 | |
---|
[218] | 927 | // Compute user buffer physical address |
---|
[228] | 928 | ko = _v2p_translate( (page_table_t*)user_ptab, (user_vaddr >> 12), &ppn, &flags); |
---|
| 929 | if (ko) { |
---|
[203] | 930 | _get_lock(&_tty_put_lock); |
---|
[218] | 931 | _puts("\n[GIET ERROR] in _dma_transfer() : user buffer unmapped\n"); |
---|
[203] | 932 | _release_lock(&_tty_put_lock); |
---|
[189] | 933 | return 3; |
---|
| 934 | } |
---|
[228] | 935 | if ((flags & PTE_U) == 0) { |
---|
[203] | 936 | _get_lock(&_tty_put_lock); |
---|
[218] | 937 | _puts("[GIET ERROR] in _dma_transfer() : user buffer not in user space\n"); |
---|
[203] | 938 | _release_lock(&_tty_put_lock); |
---|
[189] | 939 | return 4; |
---|
| 940 | } |
---|
[228] | 941 | if (((flags & PTE_W) == 0 ) && to_user) { |
---|
[203] | 942 | _get_lock(&_tty_put_lock); |
---|
[218] | 943 | _puts("\n[GIET ERROR] in _dma_transfer() : user buffer not writable\n"); |
---|
[203] | 944 | _release_lock(&_tty_put_lock); |
---|
[189] | 945 | return 5; |
---|
| 946 | } |
---|
[218] | 947 | user_pbase = (ppn << 12) | (user_vaddr & 0x00000FFF); |
---|
[189] | 948 | |
---|
[228] | 949 | /* This is a draft for IOMMU support |
---|
| 950 | |
---|
[189] | 951 | // loop on all virtual pages covering the user buffer |
---|
[169] | 952 | unsigned int user_vpn_min = user_vaddr >> 12; |
---|
| 953 | unsigned int user_vpn_max = (user_vaddr + length - 1) >> 12; |
---|
| 954 | unsigned int ix2 = 0; |
---|
| 955 | unsigned int ix1 = _dma_iommu_ix1 + dma_id; |
---|
[158] | 956 | |
---|
[169] | 957 | for ( vpn = user_vpn_min ; vpn <= user_vpn_max ; vpn++ ) |
---|
| 958 | { |
---|
[228] | 959 | // get ppn and flags for each vpn |
---|
| 960 | unsigned int ko = _v2p_translate( (page_table_t*)user_pt_vbase, |
---|
| 961 | vpn, |
---|
| 962 | &ppn, |
---|
| 963 | &flags ); |
---|
[158] | 964 | |
---|
[228] | 965 | // check access rights |
---|
| 966 | if ( ko ) return 3; // unmapped |
---|
| 967 | if ( (flags & PTE_U) == 0 ) return 4; // not in user space |
---|
| 968 | if ( ( (flags & PTE_W) == 0 ) && to_user ) return 5; // not writable |
---|
[158] | 969 | |
---|
[228] | 970 | // save first ppn value |
---|
| 971 | if ( ix2 == 0 ) ppn_first = ppn; |
---|
[169] | 972 | |
---|
[228] | 973 | if ( IOMMU_ACTIVE ) // the user buffer must be remapped in the I/0 space |
---|
| 974 | { |
---|
| 975 | // check buffer length < 2 Mbytes |
---|
| 976 | if ( ix2 > 511 ) return 2; |
---|
[169] | 977 | |
---|
[228] | 978 | // map the physical page in IOMMU page table |
---|
| 979 | _iommu_add_pte2( ix1, // PT1 index |
---|
| 980 | ix2, // PT2 index |
---|
| 981 | ppn, // physical page number |
---|
| 982 | flags ); // protection flags |
---|
| 983 | } |
---|
| 984 | else // no IOMMU : check that physical pages are contiguous |
---|
| 985 | { |
---|
| 986 | if ( (ppn - ppn_first) != ix2 ) return 6; // split physical buffer |
---|
| 987 | } |
---|
[169] | 988 | |
---|
[228] | 989 | // increment page index |
---|
| 990 | ix2++; |
---|
[169] | 991 | } // end for vpn |
---|
| 992 | |
---|
[189] | 993 | // register the number of pages to be unmapped if iommu activated |
---|
[169] | 994 | _dma_iommu_npages[dma_id] = (user_vpn_max - user_vpn_min) + 1; |
---|
| 995 | |
---|
[189] | 996 | */ |
---|
[204] | 997 | |
---|
[169] | 998 | // invalidate data cache in case of memory write |
---|
[228] | 999 | if (to_user) { |
---|
| 1000 | _dcache_buf_invalidate((void *) user_vaddr, length); |
---|
| 1001 | } |
---|
| 1002 | |
---|
[189] | 1003 | // get the lock |
---|
[228] | 1004 | _get_lock(&_dma_lock[dma_id]); |
---|
[169] | 1005 | |
---|
| 1006 | // DMA configuration |
---|
[228] | 1007 | if (to_user) { |
---|
| 1008 | dma_base[loc_id * DMA_SPAN + DMA_SRC] = (unsigned int) device_pbase; |
---|
| 1009 | dma_base[loc_id * DMA_SPAN + DMA_DST] = (unsigned int) user_pbase; |
---|
[169] | 1010 | } |
---|
[228] | 1011 | else { |
---|
| 1012 | dma_base[loc_id * DMA_SPAN + DMA_SRC] = (unsigned int) user_pbase; |
---|
| 1013 | dma_base[loc_id * DMA_SPAN + DMA_DST] = (unsigned int) device_pbase; |
---|
[169] | 1014 | } |
---|
[228] | 1015 | dma_base[loc_id * DMA_SPAN + DMA_LEN] = (unsigned int) length; |
---|
| 1016 | |
---|
[158] | 1017 | return 0; |
---|
[213] | 1018 | #else //NB_DMAS_MAX == 0 |
---|
| 1019 | return -1; |
---|
| 1020 | #endif |
---|
[218] | 1021 | } // end _dma_transfer() |
---|
| 1022 | |
---|
[228] | 1023 | |
---|
[169] | 1024 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[218] | 1025 | // _dma_completed() |
---|
| 1026 | // This function checks completion of a DMA transfer to or from a peripheral |
---|
| 1027 | // device (Frame Buffer or Multi-Nic). |
---|
| 1028 | // As it is a blocking call, the processor is busy waiting. |
---|
| 1029 | // Returns 0 if success, > 0 if error |
---|
| 1030 | // (1 == read error / 2 == DMA idle error / 3 == write error) |
---|
| 1031 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1032 | unsigned int _dma_completed() { |
---|
[218] | 1033 | #if NB_DMAS_MAX > 0 |
---|
[232] | 1034 | unsigned int task_id = _get_proc_task_id(); |
---|
[228] | 1035 | unsigned int dma_id = _get_context_slot(task_id, CTX_DMA_ID); |
---|
| 1036 | unsigned int dma_ret; |
---|
[218] | 1037 | |
---|
| 1038 | // busy waiting with a pseudo random delay between bus access |
---|
[228] | 1039 | while (_dma_done[dma_id] == 0) { |
---|
| 1040 | unsigned int delay = (( _proctime() ^ _procid() << 4) & 0x3F) + 1; |
---|
| 1041 | asm volatile( |
---|
| 1042 | "move $3, %0 \n" |
---|
| 1043 | "loop_nic_completed: \n" |
---|
| 1044 | "addi $3, $3, -1 \n" |
---|
| 1045 | "bnez $3, loop_nic_completed \n" |
---|
| 1046 | "nop \n" |
---|
| 1047 | : |
---|
| 1048 | : "r" (delay) |
---|
| 1049 | : "$3"); |
---|
[218] | 1050 | } |
---|
[228] | 1051 | |
---|
| 1052 | /* draft support for IOMMU |
---|
[218] | 1053 | // unmap the buffer from IOMMU page table if IOMMU is activated |
---|
| 1054 | if ( GIET_IOMMU_ACTIVE ) |
---|
| 1055 | { |
---|
[228] | 1056 | unsigned int* iob_address = (unsigned int*)&seg_iob_base; |
---|
[218] | 1057 | |
---|
[228] | 1058 | unsigned int ix1 = _dma_iommu_ix1 + dma_id; |
---|
| 1059 | unsigned int ix2; |
---|
[218] | 1060 | |
---|
[228] | 1061 | for ( ix2 = 0 ; ix2 < _dma_iommu_npages[dma_id] ; ix2++ ) |
---|
| 1062 | { |
---|
| 1063 | // unmap the page in IOMMU page table |
---|
| 1064 | _iommu_inval_pte2( ix1, // PT1 index |
---|
| 1065 | ix2 ); // PT2 index |
---|
[218] | 1066 | |
---|
[228] | 1067 | // clear IOMMU TLB |
---|
| 1068 | iob_address[IOB_INVAL_PTE] = (ix1 << 21) | (ix2 << 12); |
---|
[218] | 1069 | } |
---|
[228] | 1070 | } |
---|
| 1071 | */ |
---|
[218] | 1072 | |
---|
| 1073 | // reset synchronization variables |
---|
[223] | 1074 | _dma_done[dma_id] = 0; |
---|
[225] | 1075 | dma_ret = _dma_status[dma_id]; |
---|
| 1076 | asm volatile("sync\n"); |
---|
[218] | 1077 | _dma_lock[dma_id] = 0; |
---|
| 1078 | |
---|
[223] | 1079 | return dma_ret; |
---|
[218] | 1080 | |
---|
| 1081 | #else //NB_DMAS_MAX == 0 |
---|
| 1082 | return -1; |
---|
| 1083 | #endif |
---|
| 1084 | } // end _dma_completed |
---|
| 1085 | |
---|
| 1086 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1087 | // VciFrameBuffer driver |
---|
[218] | 1088 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1089 | // The vci_frame_buffer device can be accessed directly by software with memcpy(), |
---|
| 1090 | // or it can be accessed through a multi-channels DMA component: |
---|
| 1091 | // |
---|
| 1092 | // The '_fb_sync_write' and '_fb_sync_read' functions use a memcpy strategy to |
---|
| 1093 | // implement the transfer between a data buffer (user space) and the frame |
---|
| 1094 | // buffer (kernel space). They are blocking until completion of the transfer. |
---|
| 1095 | // |
---|
| 1096 | // The '_fb_write()', '_fb_read()' and '_fb_completed()' functions use the |
---|
| 1097 | // VciMultiDma components (distributed in the clusters) to transfer data |
---|
| 1098 | // between the user buffer and the frame buffer. A FBDMA channel is |
---|
| 1099 | // allocated to each task requesting it in the mapping_info data structure. |
---|
| 1100 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1101 | |
---|
| 1102 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1103 | // _fb_sync_write() |
---|
| 1104 | // Transfer data from an memory buffer to the frame_buffer device using a memcpy. |
---|
| 1105 | // - offset : offset (in bytes) in the frame buffer. |
---|
| 1106 | // - buffer : base address of the memory buffer. |
---|
| 1107 | // - length : number of bytes to be transfered. |
---|
| 1108 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1109 | unsigned int _fb_sync_write(unsigned int offset, const void * buffer, unsigned int length) { |
---|
| 1110 | unsigned char * fb_address = (unsigned char *) &seg_fbf_base + offset; |
---|
| 1111 | memcpy((void *) fb_address, (void *) buffer, length); |
---|
[218] | 1112 | return 0; |
---|
| 1113 | } |
---|
| 1114 | |
---|
[228] | 1115 | |
---|
[218] | 1116 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1117 | // _fb_sync_read() |
---|
| 1118 | // Transfer data from the frame_buffer device to a memory buffer using a memcpy. |
---|
| 1119 | // - offset : offset (in bytes) in the frame buffer. |
---|
| 1120 | // - buffer : base address of the memory buffer. |
---|
| 1121 | // - length : number of bytes to be transfered. |
---|
| 1122 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1123 | unsigned int _fb_sync_read(unsigned int offset, const void * buffer, unsigned int length) { |
---|
| 1124 | unsigned char * fb_address = (unsigned char *) &seg_fbf_base + offset; |
---|
| 1125 | memcpy((void *) buffer, (void *) fb_address, length); |
---|
[218] | 1126 | return 0; |
---|
| 1127 | } |
---|
| 1128 | |
---|
[228] | 1129 | |
---|
[218] | 1130 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[169] | 1131 | // _fb_write() |
---|
| 1132 | // Transfer data from a memory buffer to the frame_buffer device using DMA. |
---|
| 1133 | // - offset : offset (in bytes) in the frame buffer. |
---|
| 1134 | // - buffer : base address of the memory buffer. |
---|
| 1135 | // - length : number of bytes to be transfered. |
---|
| 1136 | // Returns 0 if success, > 0 if error. |
---|
| 1137 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1138 | unsigned int _fb_write(unsigned int offset, const void * buffer, unsigned int length) { |
---|
| 1139 | return _dma_transfer( |
---|
| 1140 | 0, // frame buffer |
---|
| 1141 | 0, // write |
---|
| 1142 | offset, |
---|
| 1143 | (unsigned int) buffer, |
---|
| 1144 | length); |
---|
[158] | 1145 | } |
---|
| 1146 | |
---|
[228] | 1147 | |
---|
[158] | 1148 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1149 | // _fb_read() |
---|
[169] | 1150 | // Transfer data from the frame_buffer device to a memory buffer using DMA. |
---|
[158] | 1151 | // - offset : offset (in bytes) in the frame buffer. |
---|
| 1152 | // - buffer : base address of the memory buffer. |
---|
| 1153 | // - length : number of bytes to be transfered. |
---|
| 1154 | // Returns 0 if success, > 0 if error. |
---|
| 1155 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1156 | unsigned int _fb_read(unsigned int offset, const void * buffer, unsigned int length) { |
---|
| 1157 | return _dma_transfer( |
---|
| 1158 | 0, // frame buffer |
---|
| 1159 | 1, // read |
---|
| 1160 | offset, |
---|
| 1161 | (unsigned int) buffer, |
---|
| 1162 | length); |
---|
[158] | 1163 | } |
---|
| 1164 | |
---|
[228] | 1165 | |
---|
[158] | 1166 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1167 | // _fb_completed() |
---|
| 1168 | // This function checks completion of a DMA transfer to or fom the frame buffer. |
---|
[169] | 1169 | // As it is a blocking call, the processor is busy waiting. |
---|
| 1170 | // Returns 0 if success, > 0 if error |
---|
| 1171 | // (1 == read error / 2 == DMA idle error / 3 == write error) |
---|
[158] | 1172 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1173 | unsigned int _fb_completed() { |
---|
[218] | 1174 | return _dma_completed(); |
---|
| 1175 | } |
---|
[158] | 1176 | |
---|
[218] | 1177 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1178 | // VciMultiNic driver |
---|
[218] | 1179 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1180 | // The VciMultiNic device can be accessed directly by software with memcpy(), |
---|
| 1181 | // or it can be accessed through a multi-channels DMA component: |
---|
| 1182 | // |
---|
| 1183 | // The '_nic_sync_write' and '_nic_sync_read' functions use a memcpy strategy to |
---|
| 1184 | // implement the transfer between a data buffer (user space) and the NIC |
---|
| 1185 | // buffer (kernel space). They are blocking until completion of the transfer. |
---|
| 1186 | // |
---|
| 1187 | // The '_nic_write()', '_nic_read()' and '_nic_completed()' functions use the |
---|
| 1188 | // VciMultiDma components (distributed in the clusters) to transfer data |
---|
| 1189 | // between the user buffer and the NIC. A NIDMA channel is allocated to each |
---|
| 1190 | // task requesting it in the mapping_info data structure. |
---|
| 1191 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[204] | 1192 | |
---|
[218] | 1193 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1194 | // _nic_sync_write() |
---|
| 1195 | // Transfer data from an memory buffer to the NIC device using a memcpy. |
---|
| 1196 | // - offset : offset (in bytes) in the frame buffer. |
---|
| 1197 | // - buffer : base address of the memory buffer. |
---|
| 1198 | // - length : number of bytes to be transfered. |
---|
| 1199 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1200 | unsigned int _nic_sync_write(unsigned int offset, const void * buffer, unsigned int length) { |
---|
| 1201 | unsigned char * nic_address = (unsigned char *) &seg_nic_base + offset; |
---|
| 1202 | memcpy((void *) nic_address, (void *) buffer, length); |
---|
[218] | 1203 | return 0; |
---|
| 1204 | } |
---|
[158] | 1205 | |
---|
[228] | 1206 | |
---|
[218] | 1207 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1208 | // _nic_sync_read() |
---|
| 1209 | // Transfer data from the NIC device to a memory buffer using a memcpy. |
---|
| 1210 | // - offset : offset (in bytes) in the frame buffer. |
---|
| 1211 | // - buffer : base address of the memory buffer. |
---|
| 1212 | // - length : number of bytes to be transfered. |
---|
| 1213 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1214 | unsigned int _nic_sync_read(unsigned int offset, const void * buffer, unsigned int length) { |
---|
| 1215 | unsigned char *nic_address = (unsigned char *) &seg_nic_base + offset; |
---|
| 1216 | memcpy((void *) buffer, (void *) nic_address, length); |
---|
[218] | 1217 | return 0; |
---|
| 1218 | } |
---|
[158] | 1219 | |
---|
[228] | 1220 | |
---|
[218] | 1221 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1222 | // _nic_write() |
---|
| 1223 | // Transfer data from a memory buffer to the NIC device using DMA. |
---|
| 1224 | // - offset : offset (in bytes) in the frame buffer. |
---|
| 1225 | // - buffer : base address of the memory buffer. |
---|
| 1226 | // - length : number of bytes to be transfered. |
---|
| 1227 | // Returns 0 if success, > 0 if error. |
---|
| 1228 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1229 | unsigned int _nic_write(unsigned int offset, const void * buffer, unsigned int length) { |
---|
| 1230 | return _dma_transfer( |
---|
| 1231 | 1, // NIC |
---|
| 1232 | 0, // write |
---|
| 1233 | offset, |
---|
| 1234 | (unsigned int) buffer, |
---|
| 1235 | length ); |
---|
[218] | 1236 | } |
---|
[169] | 1237 | |
---|
[228] | 1238 | |
---|
[218] | 1239 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1240 | // _nic_read() |
---|
| 1241 | // Transfer data from the NIC device to a memory buffer using DMA. |
---|
| 1242 | // - offset : offset (in bytes) in the frame buffer. |
---|
| 1243 | // - buffer : base address of the memory buffer. |
---|
| 1244 | // - length : number of bytes to be transfered. |
---|
| 1245 | // Returns 0 if success, > 0 if error. |
---|
| 1246 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1247 | unsigned int _nic_read(unsigned int offset, const void * buffer, unsigned int length) { |
---|
| 1248 | return _dma_transfer( |
---|
| 1249 | 1, // NIC |
---|
| 1250 | 1, // read |
---|
| 1251 | offset, |
---|
| 1252 | (unsigned int) buffer, |
---|
| 1253 | length ); |
---|
[218] | 1254 | } |
---|
[189] | 1255 | |
---|
[228] | 1256 | |
---|
[218] | 1257 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 1258 | // _nic_completed() |
---|
| 1259 | // This function checks completion of a DMA transfer to or fom a NIC channel. |
---|
| 1260 | // As it is a blocking call, the processor is busy waiting. |
---|
| 1261 | // Returns 0 if success, > 0 if error |
---|
| 1262 | // (1 == read error / 2 == DMA idle error / 3 == write error) |
---|
| 1263 | ////////////////////////////////////////////////////////////////////////////////// |
---|
[228] | 1264 | unsigned int _nic_completed() { |
---|
[218] | 1265 | return _dma_completed(); |
---|
[158] | 1266 | } |
---|
| 1267 | |
---|
[232] | 1268 | /////////////////////////////////////////////////////////////////////////////////// |
---|
| 1269 | // _heap_info() |
---|
| 1270 | // This function returns the information associated to a heap (size and vaddr) |
---|
| 1271 | // It uses the global task id (CTX_GTID_ID, unique for each giet task) and the |
---|
| 1272 | // vspace id (CTX_VSID_ID) defined in the context |
---|
| 1273 | /////////////////////////////////////////////////////////////////////////////////// |
---|
| 1274 | unsigned int _heap_info(unsigned int * vaddr, unsigned int * size) { |
---|
| 1275 | mapping_header_t * header = (mapping_header_t *) (&seg_mapping_base); |
---|
| 1276 | mapping_task_t * tasks = _get_task_base(header); |
---|
| 1277 | mapping_vobj_t * vobjs = _get_vobj_base(header); |
---|
| 1278 | mapping_vspace_t * vspaces = _get_vspace_base(header); |
---|
| 1279 | unsigned int taskid = _get_context_slot(_get_proc_task_id(), CTX_GTID_ID); |
---|
| 1280 | unsigned int vspaceid = _get_context_slot(_get_proc_task_id(), CTX_VSID_ID); |
---|
| 1281 | int heap_local_vobjid = tasks[taskid].heap_vobjid; |
---|
| 1282 | if (heap_local_vobjid != -1) { |
---|
| 1283 | unsigned int vobjheapid = heap_local_vobjid + vspaces[vspaceid].vobj_offset; |
---|
| 1284 | *vaddr = vobjs[vobjheapid].vaddr; |
---|
| 1285 | *size = vobjs[vobjheapid].length; |
---|
| 1286 | return 0; |
---|
| 1287 | } |
---|
| 1288 | else { |
---|
| 1289 | *vaddr = 0; |
---|
| 1290 | *size = 0; |
---|
| 1291 | return 0; |
---|
| 1292 | } |
---|
| 1293 | } |
---|
| 1294 | |
---|
[228] | 1295 | // Local Variables: |
---|
| 1296 | // tab-width: 4 |
---|
| 1297 | // c-basic-offset: 4 |
---|
| 1298 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
---|
| 1299 | // indent-tabs-mode: nil |
---|
| 1300 | // End: |
---|
| 1301 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
---|
| 1302 | |
---|