source: trunk/kernel/fs/devfs.c@ 604

Last change on this file since 604 was 602, checked in by alain, 8 years ago

Improve the FAT32 file system to support cat, rm, cp commands.
File size: 20.8 KB
Line 
1/*
2 * devfs.c - DEVFS File system API implementation.
3 *
4 * Author Mohamed Lamine Karaoui (2014,2015)
5 * Alain Greiner (2016,2017)
6 *
7 * Copyright (c) Sorbonne Universites
8 *
9 * This file is part of ALMOS-MKH.
10 *
11 * ALMOS-MKH is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2.0 of the License.
14 *
15 * ALMOS-MKH is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#include <hal_kernel_types.h>
26#include <hal_special.h>
27#include <hal_uspace.h>
28#include <printk.h>
29#include <chdev.h>
30#include <thread.h>
31#include <dev_txt.h>
32#include <cluster.h>
33#include <vfs.h>
34#include <kmem.h>
35#include <devfs.h>
36
37/////////////////////////////////////////////////////////////////////////////////////////
38// Extern variables
39/////////////////////////////////////////////////////////////////////////////////////////
40
41extern vfs_ctx_t fs_context[]; // allocated in kernel_init.c
42extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
43
44#if (DEBUG_SYS_READ & 1)
45extern uint32_t enter_devfs_read;
46extern uint32_t exit_devfs_read;
47#endif
48
49#if (DEBUG_SYS_WRITE & 1)
50extern uint32_t enter_devfs_write;
51extern uint32_t exit_devfs_write;
52#endif
53
54/////////////////////////////////////
55devfs_ctx_t * devfs_ctx_alloc( void )
56{
57 kmem_req_t req;
58
59 req.type = KMEM_DEVFS_CTX;
60 req.size = sizeof(devfs_ctx_t);
61 req.flags = AF_KERNEL | AF_ZERO;
62
63 return (devfs_ctx_t *)kmem_alloc( &req );
64}
65
66/////////////////////////////////////////////
67void devfs_ctx_init( devfs_ctx_t * devfs_ctx,
68 xptr_t devfs_dev_inode_xp,
69 xptr_t devfs_external_inode_xp )
70{
71 devfs_ctx->dev_inode_xp = devfs_dev_inode_xp;
72 devfs_ctx->external_inode_xp = devfs_external_inode_xp;
73
74 fs_context[FS_TYPE_DEVFS].extend = devfs_ctx;
75}
76
77/////////////////////////////////////////////////
78void devfs_ctx_destroy( devfs_ctx_t * devfs_ctx )
79{
80 kmem_req_t req;
81
82 req.type = KMEM_DEVFS_CTX;
83 req.ptr = devfs_ctx;
84 kmem_free( &req );
85}
86
87/////////////////////////////////////////////////
88void devfs_global_init( xptr_t root_inode_xp,
89 xptr_t * devfs_dev_inode_xp,
90 xptr_t * devfs_external_inode_xp )
91{
92 error_t error;
93 xptr_t unused_xp; // required by vfs_add_child_in_parent()
94
95 // creates DEVFS "dev" inode in cluster 0
96 error = vfs_add_child_in_parent( 0, // cxy
97 INODE_TYPE_DIR,
98 FS_TYPE_DEVFS,
99 root_inode_xp,
100 "dev",
101 &unused_xp,
102 devfs_dev_inode_xp );
103
104 assert( (error == 0) , "cannot create <dev>\n" );
105
106#if DEBUG_DEVFS_INIT
107uint32_t cycle = (uint32_t)hal_get_cycles();
108thread_t * this = CURRENT_THREAD;
109if( DEBUG_DEVFS_INIT < cycle )
110printk("\n[%s] thread[%x,%x] created <dev> inode / cycle %d\n",
111__FUNCTION__, this->process->pid, this->trdid, cycle );
112#endif
113
114 // create DEVFS "external" inode in cluster 0
115 error = vfs_add_child_in_parent( 0, // cxy
116 INODE_TYPE_DIR,
117 FS_TYPE_DEVFS,
118 *devfs_dev_inode_xp,
119 "external",
120 &unused_xp,
121 devfs_external_inode_xp );
122
123 assert( (error == 0) , "cannot create <external>\n" );
124
125#if DEBUG_DEVFS_INIT
126cycle = (uint32_t)hal_get_cycles();
127if( DEBUG_DEVFS_INIT < cycle )
128printk("\n[%s] thread[%x,%x] created <external> inode / cycle %d\n",
129__FUNCTION__, this->process->pid, this->trdid, cycle );
130#endif
131
132} // end devfs_global_init()
133
134///////////////////////////////////////////////////
135void devfs_local_init( xptr_t devfs_dev_inode_xp,
136 xptr_t devfs_external_inode_xp,
137 xptr_t * devfs_internal_inode_xp )
138{
139 char node_name[16];
140 xptr_t chdev_xp;
141 cxy_t chdev_cxy;
142 chdev_t * chdev_ptr;
143 xptr_t inode_xp;
144 cxy_t inode_cxy;
145 vfs_inode_t * inode_ptr;
146 uint32_t channel;
147 xptr_t unused_xp; // required by add_child_in_parent()
148
149 // create "internal" directory
150 snprintf( node_name , 16 , "internal_%x" , local_cxy );
151 vfs_add_child_in_parent( local_cxy,
152 INODE_TYPE_DIR,
153 FS_TYPE_DEVFS,
154 devfs_dev_inode_xp,
155 node_name,
156 &unused_xp,
157 devfs_internal_inode_xp );
158#if DEBUG_DEVFS_INIT
159uint32_t cycle = (uint32_t)hal_get_cycles();
160thread_t * this = CURRENT_THREAD;
161if( DEBUG_DEVFS_INIT < cycle )
162printk("\n[%s] thread[%x,%x] created <%s> inode in cluster %x / cycle %d\n",
163__FUNCTION__, this->process->pid, this->trdid, node_name, local_cxy, cycle );
164#endif
165
166 // create MMC chdev inode
167 chdev_xp = chdev_dir.mmc[local_cxy];
168 if( chdev_xp != XPTR_NULL)
169 {
170 chdev_ptr = GET_PTR( chdev_xp );
171 vfs_add_child_in_parent( local_cxy,
172 INODE_TYPE_DEV,
173 FS_TYPE_DEVFS,
174 *devfs_internal_inode_xp,
175 chdev_ptr->name,
176 &unused_xp,
177 &inode_xp );
178
179 // update child inode "extend" field
180 inode_cxy = GET_CXY( inode_xp );
181 inode_ptr = GET_PTR( inode_xp );
182 hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
183
184#if DEBUG_DEVFS_INIT
185cycle = (uint32_t)hal_get_cycles();
186if( DEBUG_DEVFS_INIT < cycle )
187printk("\n[%s] thread[%x,%x] created <mmc> inode in cluster %x\n",
188__FUNCTION__, this->process->pid, this->trdid, local_cxy, cycle );
189#endif
190
191 }
192
193 // create DMA chdev inodes (one DMA channel per core)
194 for( channel = 0 ; channel < LOCAL_CLUSTER->cores_nr ; channel++ )
195 {
196 chdev_xp = chdev_dir.dma[channel];
197 if( chdev_xp != XPTR_NULL)
198 {
199 chdev_ptr = GET_PTR( chdev_xp );
200 vfs_add_child_in_parent( local_cxy,
201 INODE_TYPE_DEV,
202 FS_TYPE_DEVFS,
203 *devfs_internal_inode_xp,
204 chdev_ptr->name,
205 &unused_xp,
206 &inode_xp );
207
208 // update child inode "extend" field
209 inode_cxy = GET_CXY( inode_xp );
210 inode_ptr = GET_PTR( inode_xp );
211 hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
212
213#if DEBUG_DEVFS_INIT
214cycle = (uint32_t)hal_get_cycles();
215if( DEBUG_DEVFS_INIT < cycle )
216printk("\n[%s] thread [%x,%x] created <dma[%d]> inode in cluster %x\n",
217__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
218#endif
219 }
220 }
221
222 // create an IOB inode in cluster containing IOB chdev
223 chdev_xp = chdev_dir.iob;
224 if( chdev_xp != XPTR_NULL )
225 {
226 chdev_cxy = GET_CXY( chdev_xp );
227 chdev_ptr = GET_PTR( chdev_xp );
228 if( chdev_cxy == local_cxy )
229 {
230 vfs_add_child_in_parent( local_cxy,
231 INODE_TYPE_DEV,
232 FS_TYPE_DEVFS,
233 devfs_external_inode_xp,
234 chdev_ptr->name,
235 &unused_xp,
236 &inode_xp );
237
238 // update child inode "extend" field
239 inode_cxy = GET_CXY( inode_xp );
240 inode_ptr = GET_PTR( inode_xp );
241 hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
242
243#if DEBUG_DEVFS_INIT
244cycle = (uint32_t)hal_get_cycles();
245if( DEBUG_DEVFS_INIT < cycle )
246printk("\n[%s] thread[%x,%x] created <iob> inode in cluster %x\n",
247__FUNCTION__, this->process->pid, this->trdid, local_cxy, cycle );
248#endif
249 }
250 }
251
252 // create a PIC inode in cluster containing PIC chdev
253 chdev_xp = chdev_dir.pic;
254 if( chdev_xp != XPTR_NULL )
255 {
256 chdev_cxy = GET_CXY( chdev_xp );
257 chdev_ptr = GET_PTR( chdev_xp );
258 if( chdev_cxy == local_cxy )
259 {
260 vfs_add_child_in_parent( local_cxy,
261 INODE_TYPE_DEV,
262 FS_TYPE_DEVFS,
263 devfs_external_inode_xp,
264 chdev_ptr->name,
265 &unused_xp,
266 &inode_xp );
267
268 // update child inode "extend" field
269 inode_cxy = GET_CXY( inode_xp );
270 inode_ptr = GET_PTR( inode_xp );
271 hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
272
273#if DEBUG_DEVFS_INIT
274cycle = (uint32_t)hal_get_cycles();
275if( DEBUG_DEVFS_INIT < cycle )
276printk("\n[%s] thread[%x,%x] created <pic> inode in cluster %x\n",
277__FUNCTION__, this->process->pid, this->trdid, local_cxy, cycle );
278#endif
279 }
280 }
281
282 // create a TXT_RX inode in each cluster containing a TXT_RX chdev
283 for( channel = 0 ; channel < CONFIG_MAX_TXT_CHANNELS ; channel++ )
284 {
285 chdev_xp = chdev_dir.txt_rx[channel];
286 if( chdev_xp != XPTR_NULL )
287 {
288 chdev_cxy = GET_CXY( chdev_xp );
289 chdev_ptr = GET_PTR( chdev_xp );
290 if( chdev_cxy == local_cxy )
291 {
292 vfs_add_child_in_parent( local_cxy,
293 INODE_TYPE_DEV,
294 FS_TYPE_DEVFS,
295 devfs_external_inode_xp,
296 chdev_ptr->name,
297 &unused_xp,
298 &inode_xp );
299
300 // update child inode "extend" field
301 inode_cxy = GET_CXY( inode_xp );
302 inode_ptr = GET_PTR( inode_xp );
303 hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
304
305#if DEBUG_DEVFS_INIT
306cycle = (uint32_t)hal_get_cycles();
307if( DEBUG_DEVFS_INIT < cycle )
308printk("\n[%s] thread[%x,%x] created <txt_rx[%d]> inode in cluster %x\n",
309__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
310#endif
311 }
312 }
313 }
314
315 // create a TXT_TX inode in each cluster containing a TXT_TX chdev
316 for( channel = 0 ; channel < CONFIG_MAX_TXT_CHANNELS ; channel++ )
317 {
318 chdev_xp = chdev_dir.txt_tx[channel];
319 if( chdev_xp != XPTR_NULL )
320 {
321 chdev_cxy = GET_CXY( chdev_xp );
322 chdev_ptr = GET_PTR( chdev_xp );
323 if( chdev_cxy == local_cxy )
324 {
325 vfs_add_child_in_parent( local_cxy,
326 INODE_TYPE_DEV,
327 FS_TYPE_DEVFS,
328 devfs_external_inode_xp,
329 chdev_ptr->name,
330 &unused_xp,
331 &inode_xp );
332
333 // update child inode "extend" field
334 inode_cxy = GET_CXY( inode_xp );
335 inode_ptr = GET_PTR( inode_xp );
336 hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
337
338#if DEBUG_DEVFS_INIT
339cycle = (uint32_t)hal_get_cycles();
340if( DEBUG_DEVFS_INIT < cycle )
341printk("\n[%s] thread[%x,%x] created <txt_tx[%d]> inode in cluster %x\n",
342__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
343#endif
344 }
345 }
346 }
347
348 // create an IOC inode in each cluster containing an IOC chdev
349 for( channel = 0 ; channel < CONFIG_MAX_IOC_CHANNELS ; channel++ )
350 {
351 chdev_xp = chdev_dir.ioc[channel];
352 if( chdev_xp != XPTR_NULL )
353 {
354 chdev_cxy = GET_CXY( chdev_xp );
355 chdev_ptr = GET_PTR( chdev_xp );
356 if( chdev_cxy == local_cxy )
357 {
358 vfs_add_child_in_parent( local_cxy,
359 INODE_TYPE_DEV,
360 FS_TYPE_DEVFS,
361 devfs_external_inode_xp,
362 chdev_ptr->name,
363 &unused_xp,
364 &inode_xp );
365
366 // update child inode "extend" field
367 inode_cxy = GET_CXY( inode_xp );
368 inode_ptr = GET_PTR( inode_xp );
369 hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
370
371#if DEBUG_DEVFS_INIT
372cycle = (uint32_t)hal_get_cycles();
373if( DEBUG_DEVFS_INIT < cycle )
374printk("\n[%s] thread[%x,%x] created <ioc[%d]> inode in cluster %x\n",
375__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
376#endif
377 }
378 }
379 }
380
381 // create a FBF inode in each cluster containing a FBF chdev
382 for( channel = 0 ; channel < CONFIG_MAX_FBF_CHANNELS ; channel++ )
383 {
384 chdev_xp = chdev_dir.fbf[channel];
385 if( chdev_xp != XPTR_NULL )
386 {
387 chdev_cxy = GET_CXY( chdev_xp );
388 chdev_ptr = GET_PTR( chdev_xp );
389 if( chdev_cxy == local_cxy )
390 {
391 vfs_add_child_in_parent( local_cxy,
392 INODE_TYPE_DEV,
393 FS_TYPE_DEVFS,
394 devfs_external_inode_xp,
395 chdev_ptr->name,
396 &unused_xp,
397 &inode_xp );
398
399 // update child inode "extend" field
400 inode_cxy = GET_CXY( inode_xp );
401 inode_ptr = GET_PTR( inode_xp );
402 hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
403
404#if DEBUG_DEVFS_INIT
405cycle = (uint32_t)hal_get_cycles();
406if( DEBUG_DEVFS_INIT < cycle )
407printk("\n[%s] thread[%x,%x] created <fbf[%d]> inode in cluster %x\n",
408__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
409#endif
410 }
411 }
412 }
413
414 // create a NIC_RX inode in each cluster containing a NIC_RX chdev
415 for( channel = 0 ; channel < CONFIG_MAX_NIC_CHANNELS ; channel++ )
416 {
417 chdev_xp = chdev_dir.nic_rx[channel];
418 if( chdev_xp != XPTR_NULL )
419 {
420 chdev_cxy = GET_CXY( chdev_xp );
421 chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
422 if( chdev_cxy == local_cxy )
423 {
424 vfs_add_child_in_parent( local_cxy,
425 INODE_TYPE_DEV,
426 FS_TYPE_DEVFS,
427 devfs_external_inode_xp,
428 chdev_ptr->name,
429 &unused_xp,
430 &inode_xp );
431#if DEBUG_DEVFS_INIT
432cycle = (uint32_t)hal_get_cycles();
433if( DEBUG_DEVFS_INIT < cycle )
434printk("\n[%s] thread[%x,%x] created <nic_rx[%d]> inode in cluster %x\n",
435__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
436#endif
437 }
438 }
439 }
440
441 // create a NIC_TX inode in each cluster containing a NIC_TX chdev
442 for( channel = 0 ; channel < CONFIG_MAX_NIC_CHANNELS ; channel++ )
443 {
444 chdev_xp = chdev_dir.nic_tx[channel];
445 if( chdev_xp != XPTR_NULL )
446 {
447 chdev_cxy = GET_CXY( chdev_xp );
448 chdev_ptr = GET_PTR( chdev_xp );
449 if( chdev_cxy == local_cxy )
450 {
451 vfs_add_child_in_parent( local_cxy,
452 INODE_TYPE_DEV,
453 FS_TYPE_DEVFS,
454 devfs_external_inode_xp,
455 chdev_ptr->name,
456 &unused_xp,
457 &inode_xp );
458
459 // update child inode "extend" field
460 inode_cxy = GET_CXY( inode_xp );
461 inode_ptr = GET_PTR( inode_xp );
462 hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
463
464#if DEBUG_DEVFS_INIT
465cycle = (uint32_t)hal_get_cycles();
466if( DEBUG_DEVFS_INIT < cycle )
467printk("\n[%s] thread[%x,%x] created <nic_tx[%d]> inode in cluster %x\n",
468__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
469#endif
470 }
471 }
472 }
473} // end devfs_local_init()
474
475//////////////////////////////////////////
476int devfs_user_move( bool_t to_buffer,
477 xptr_t file_xp,
478 char * u_buf,
479 uint32_t size )
480{
481 xptr_t chdev_xp;
482 cxy_t chdev_cxy;
483 chdev_t * chdev_ptr; // associated chdev type
484 uint32_t func; // chdev functionnal type
485 uint32_t channel; // chdev channel index
486 uint32_t burst; // number of bytes in a burst
487 uint32_t todo; // number of bytes not yet moved
488 error_t error;
489 uint32_t i;
490
491 char k_buf[CONFIG_TXT_KBUF_SIZE]; // local kernel buffer
492
493assert( ( file_xp != XPTR_NULL ) , "file_xp == XPTR_NULL" );
494
495#if (DEBUG_SYS_READ & 1)
496enter_devfs_read = hal_time_stamp();
497#endif
498
499#if (DEBUG_SYS_WRITE & 1)
500enter_devfs_write = hal_time_stamp();
501#endif
502
503#if DEBUG_DEVFS_MOVE
504uint32_t cycle = (uint32_t)hal_get_cycles();
505thread_t * this = CURRENT_THREAD;
506if( DEBUG_DEVFS_MOVE < cycle )
507printk("\n[%s] thread[%x,%x] enter / to_mem %d / cycle %d\n",
508__FUNCTION__, this->process->pid, this->trdid, to_buffer, cycle );
509#endif
510
511 // get extended pointer on chdev_xp
512 chdev_xp = chdev_from_file( file_xp );
513
514 // get cluster and local pointer on chdev
515 chdev_cxy = GET_CXY( chdev_xp );
516 chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
517
518 // get chdev functionnal type and channel
519 func = hal_remote_l32( XPTR( chdev_cxy , &chdev_ptr->func ) );
520 channel = hal_remote_l32( XPTR( chdev_cxy , &chdev_ptr->channel ) );
521
522// Only TXT devices are associated to a pseudo-file
523assert( ( func == DEV_FUNC_TXT ) , __FUNCTION__, "illegal device func_type");
524
525 // initialise number of bytes to move
526 todo = size;
527
528 /////////////// TXT read
529 if( to_buffer )
530 {
531 while( todo )
532 {
533 // set burst size
534 if( todo > CONFIG_TXT_KBUF_SIZE ) burst = CONFIG_TXT_KBUF_SIZE;
535 else burst = todo;
536
537 // read burst bytes from TXT device to kernel buffer
538 for( i = 0 ; i < burst ; i++ )
539 {
540 error = dev_txt_read( channel , &k_buf[i] );
541
542 if( error ) return -1;
543 }
544
545 // move burst bytes from k_buf to u_buf
546 hal_strcpy_to_uspace( u_buf , k_buf , burst );
547
548 // update loop variables
549 todo -= burst;
550 u_buf += burst;
551 }
552
553#if DEBUG_DEVFS_MOVE
554cycle = (uint32_t)hal_get_cycles();
555if( DEBUG_DEVFS_MOVE < cycle )
556printk("\n[%s] thread[%x,%x] exit / to_mem %d / cycle %d\n",
557__FUNCTION__, this->process->pid, this->trdid, to_buffer, cycle );
558#endif
559
560#if (DEBUG_SYS_READ & 1)
561exit_devfs_read = hal_time_stamp();
562#endif
563 return size;
564 }
565 ///////////// TXT write
566 else
567 {
568 while( todo )
569 {
570 // set burst size
571 if( todo > CONFIG_TXT_KBUF_SIZE ) burst = CONFIG_TXT_KBUF_SIZE;
572 else burst = todo;
573
574 // move burst bytes from u_buf to k_buf
575 hal_strcpy_from_uspace( k_buf , u_buf , burst );
576
577 // write burst bytes from kernel buffer to TXT device
578 error = dev_txt_write( channel , k_buf , burst );
579
580 if( error ) return -1;
581
582 // update loop variables
583 todo -= burst;
584 u_buf += burst;
585 }
586
587#if DEBUG_DEVFS_MOVE
588cycle = (uint32_t)hal_get_cycles();
589if( DEBUG_DEVFS_MOVE < cycle )
590printk("\n[%s] thread[%x,%x] exit / to_mem %d / cycle %d\n",
591__FUNCTION__, this->process->pid, this->trdid, to_buffer, cycle );
592#endif
593
594#if (DEBUG_SYS_WRITE & 1)
595exit_devfs_write = hal_time_stamp();
596#endif
597 return size;
598 }
599
600} // end devfs_user_move()
601
602
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