source: trunk/kernel/syscalls/syscalls.h @ 484

Last change on this file since 484 was 479, checked in by viala@…, 6 years ago

[kern/syscall] Add void type to function prototypes with no parameter
File size: 37.9 KB
Line 
1/*
2 * syscalls.h - Kernel side services for syscall handling.
3 *
4 * Author     Alain Greiner (2016,2017,2018)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#ifndef _SYSCALLS_H_
25#define _SYSCALLS_H_
26
27#include <hal_kernel_types.h>
28#include <shared_syscalls.h>
29
30/**   Forward declarations  *****/
31
32struct thread_s;                  // defined in thread.h
33struct pthread_attr_s;            // defined in thread.h
34struct vfs_stat_s;                // defined in vfs.h
35struct vfs_dirent_s;              // defined in vfs.h
36struct mmap_attr_s;               // defined in vmm.h
37
38/******************************************************************************************
39 * [0] This function terminates the execution of the calling user thread,
40 * and makes the exit_value pointer available to any successful pthread_join() with the
41 * terminating thread.
42 * It actually set the THREAD_SIG_EXIT signal, set the THREAD_BLOCKED_GLOBAL bit in the
43 * thread descriptor and deschedule.
44 * The thread will be detached from its process, and the memory allocated to the thread
45 * descriptor will be released later by the scheduler.
46 ******************************************************************************************
47 * @ exit_vallue  : pointer to be returned to joining thread if thread is attached.
48 * @ return 0 if success / return -1 if all locks not released or illegal argument.
49 *****************************************************************************************/
50int sys_thread_exit( void * exit_value );
51
52/******************************************************************************************
53 * [1] This function calls the scheduler for the core running the calling thread.
54 ******************************************************************************************
55 * @ x_size   : [out] number of clusters in a row.
56 * @ y_size   : [out] number of clusters in a column.
57 * @ ncores   : [out] number of cores per cluster.
58 * @ return always 0.
59 *****************************************************************************************/
60int sys_thread_yield( void );
61
62/******************************************************************************************
63 * [2] This function creates a new user thread. The <user_attr> argument is a pointer
64 * on astructure containing the thread attributes, defined in thread.h file.
65 ******************************************************************************************
66 * @ new_thread  : [out] local pointer on created thread descriptor.
67 * @ user_attr   : [in]  pointer on thread attributes structure.
68 * @ start_func  : [in]  pointer on start function.
69 * @ start_args  : [in]  pointer on start function arguments.
70 * @ return 0 if success / return -1 if failure.
71 *****************************************************************************************/
72int sys_thread_create( struct thread_s        * new_thread,
73                       struct pthread_attr_s  * user_attr,
74                       void                   * start_func,
75                       void                   * start_args );
76
77/******************************************************************************************
78 * [3] This blocking function suspend execution of the calling thread until completion
79 * of another target thread identified by the <trdid> argument.
80 * The target thread must be joinable (running in ATTACHED mode), and must be different
81 * from the calling thread.
82 * If the <exit_value> argument is not NULL, the value passed to pthread_exit() by the
83 * target thread is stored in the location referenced by exit_value.
84 ******************************************************************************************
85 * @ trdid     : [in]  target thread identifier.
86 * @ thread    : [out] buffer for exit_value returned by target thread.
87 * @ return 0 if success / return -1 if failure.
88 *****************************************************************************************/
89int sys_thread_join( trdid_t    trdid,
90                     void    ** exit_value );
91
92/******************************************************************************************
93 * [4] This function detach a joinable thread.
94 ******************************************************************************************
95 * @ trdid   : thread identifier.
96 * @ return 0 if success / return -1 if failure.
97 *****************************************************************************************/
98int sys_thread_detach( trdid_t  trdid );
99
100/******************************************************************************************
101 * [5] This function requests a target thread identified by its <trdid> argument
102 * to be cancelled. It calls the thread_kill() function to block the target thread
103 * on the THREAD_BLOCKED_GLOBAL condition, and to set the THREAD_FLAG_REQ_DELETE.
104 * The thread will be detached from its process, and the memory allocated to the thread
105 * descriptor will be released by the scheduler at the next scheduling point.
106 ******************************************************************************************
107 * @ trdid   : thread identifier.
108 * @ return 0 if success / return -1 if illegal argument.
109 *****************************************************************************************/
110int sys_thread_cancel( trdid_t  trdid );
111
112/******************************************************************************************
113 * [6] This function implement all operations on a POSIX unnamed semaphore,
114 * that can be shared by threads running in different clusters.
115 * The kernel structure representing a remote semaphore is in the remote_sem.h file,
116 * and the code implementing the operations is in the remore_sem.c file.
117 ******************************************************************************************
118 * @ vaddr         : semaphore virtual address in user space == identifier.
119 * @ operation     : SEM_INIT / SEM_DESTROY / SEM_GETVALUE / SEM_POST / SEM_WAIT.
120 * @ init_value    : initial semaphore value.
121 * @ current_value : pointer on buffer for current semaphore value.
122 * @ return 0 if success / return -1 if failure.
123 *****************************************************************************************/
124int sys_sem( void       * vaddr,
125             uint32_t     operation,
126             uint32_t     init_value,
127             uint32_t   * current_value );
128
129/******************************************************************************************
130 * [7] This function implement all operations on a POSIX condition variable.
131 * The kernel structure representing a cond_var is defined in the remote_cv.h file,
132 * The code implementing the operations is defined in the remote_cv.c file.
133 ******************************************************************************************
134 * @ vaddr     : condvar virtual address in user space == identifier.
135 * @ operation : operation type (see below).
136 * @ attr      : mutex virtual address in user space == identifier.
137 * @ return 0 if success / return -1 if failure.
138 *****************************************************************************************/
139int sys_condvar( void     * condvar,
140                 uint32_t   operation,
141                 void     * mutex );
142
143/******************************************************************************************
144 * [8] This function implement all operations on a POSIX barrier.
145 * The kernel structure representing a barrier is defined in the remote_barrier.h file.
146 * The code implementting the operations is defined in the remote_barrier.c file.
147 ******************************************************************************************
148 * @ vaddr     : barrier virtual address in user space == identifier.
149 * @ operation : BARRIER_INIT / BARRIER_DESTROY / BARRIER_WAIT.
150 * @ count     : number of expected threads (only used by BARRIER_INIT operation).
151 * @ return 0 if success / return -1 if failure.
152 *****************************************************************************************/
153int sys_barrier( void     * vaddr,
154                 uint32_t   operation,
155                 uint32_t   count );
156
157/******************************************************************************************
158 * [9] This function implement all operations on a POSIX mutex.
159 * The kernel structure representing a barrier is defined in the remote_barrier.h file.
160 * The code implementting the operations is defined in the remote_barrier.c file.
161 ******************************************************************************************
162 * @ vaddr     : mutex virtual address in user space == identifier.
163 * @ operation : MUTEX_INIT / MUTEX_DESTROY / MUTEX_LOCK / MUTEX_UNLOCK
164 * @ attr      : mutex attributes (non supported yet => must be 0).
165 * @ return 0 if success / return -1 if failure.
166 *****************************************************************************************/
167int sys_mutex( void     * vaddr,
168               uint32_t   operation,
169               uint32_t   count );
170
171/******************************************************************************************
172 * [10] This function implement the exit system call terminating a POSIX process.
173 * It can be called by any thread running in any cluster.
174 * It uses both remote accesses to access the owner process descriptor, and the
175 * RPC_PROCESS_SIGACTION to delete remote process and thread descriptors.
176 * In the present implementation, this function implements actually the _exit():
177 * - it does not flush open output streams.
178 * - it does not close open streams.
179 ******************************************************************************************
180 * @ status   : terminaison status (not used in present implementation).
181 *****************************************************************************************/
182int sys_exit( uint32_t status );
183
184/******************************************************************************************
185 * [11] This function remove an existing mapping defined by the <addr> and <size>
186 * arguments in user space.
187 ******************************************************************************************
188 * @ addr  : base address in user space.
189 * # size  : number of bytes.
190 * @ return 0 if success / return -1 if failure.
191 *****************************************************************************************/
192int sys_munmap( void     * addr,
193                uint32_t   size );
194
195/******************************************************************************************
196 * [12] This function open or create an open file descriptor.
197 ******************************************************************************************
198 * @ pathname   : pathname (can be relative or absolute).
199 * @ flags      : bit vector attributes (see in shared_fcntl.h file)
200 * @ mode       : access rights.
201 * @ return file descriptor index in fd_array if success / return -1 if failure.
202 *****************************************************************************************/
203int sys_open( char    * pathname,
204              uint32_t  flags,
205              uint32_t  mode );
206
207/******************************************************************************************
208 * [13] This function map physical memory (or a file) in the calling thread virtual space.
209 * The <attr> argument is a pointer on a structure for arguments (see shared_syscalls.h).
210 ******************************************************************************************
211 * @ attr       : pointer on attributes structure.
212 * @ return 0 if success / return -1 if failure.
213 *****************************************************************************************/
214int sys_mmap( mmap_attr_t * attr );
215
216/******************************************************************************************
217 * [14] This function read bytes from an open file identified by its file descriptor.
218 * The file can be a regular file or character oriented device.
219 * IRQs are enabled during this system call.
220 ******************************************************************************************
221 * @ file_id  : open file index in fd_array.
222 * @ buf      : buffer virtual address in user space.
223 * @ count    : number of bytes.
224 * @ return number of bytes actually read if success / returns -1 if failure.
225 *****************************************************************************************/
226int sys_read( uint32_t   file_id,
227              void     * buf,
228              uint32_t   count );
229
230/******************************************************************************************
231 * [15] This function writes bytes to an open file identified by its file descriptor.
232 * The file can be a regular file or character oriented device.
233 * IRQs are enabled during this system call.
234 ******************************************************************************************
235 * @ file_id  : open file index in fd_array.
236 * @ buf      : buffer virtual address in user space.
237 * @ count    : number of bytes.
238 * @ return number of bytes actually written if success / returns -1 if failure.
239 *****************************************************************************************/
240int sys_write( uint32_t   file_id,
241               void     * buf,
242               uint32_t   count );
243
244/******************************************************************************************
245 * [16] This function repositions the offset of the file descriptor identified by <file_id>,
246 * according to the operation type defined by the <whence> argument.
247 ******************************************************************************************
248 * @ file_id  : open file index in fd_array.
249 * @ offset   : used to compute new offset value.
250 * @ whence   : operation type (see below).
251 * @ return 0 if success / returns -1 if failure.
252 *****************************************************************************************/
253int sys_lseek( xptr_t    file_id,
254               uint32_t  offset,
255               uint32_t  whence );
256
257/******************************************************************************************
258 * [17] This function release the memory allocated for the file descriptor identified by
259 * the <file_id> argument, and remove the fd array_entry in all copies of the process
260 * descriptor.
261 ******************************************************************************************
262  file_id   : file descriptor index in fd_array.
263 * @ return 0 if success / returns -1 if failure.
264 *****************************************************************************************/
265int sys_close( uint32_t file_id );
266
267/******************************************************************************************
268 * [18] This function removes a directory entry identified by the <pathname> from the
269 * directory, and decrement the link count of the file referenced by the link.
270 * If the link count reduces to zero, and no process has the file open, then all resources
271 * associated with the file are reclaimed.  If one or more process have the file open when
272 * the last link is removed, the link is removed, but the removal of the file is delayed
273 * until all references to it have been closed.
274 ******************************************************************************************
275 * @ pathname   : pathname (can be relative or absolute).
276 * @ return 0 if success / returns -1 if failure.
277 *****************************************************************************************/
278int sys_unlink( char * pathname );
279
280/******************************************************************************************
281 * [19] This function creates in the calling thread cluster an unnamed pipe, and two
282 * (read and write) file descriptors.
283 * TODO not implemented yet...
284 ******************************************************************************************
285 * @ file_id[0] : [out] read only file descriptor index.
286 * @ file_id[1] : [out] write only file descriptor index.
287 * @ return 0 if success / return -1 if failure.
288 *****************************************************************************************/
289int sys_pipe( uint32_t file_id[2] );
290
291/******************************************************************************************
292 * [20] This function change the current working directory in reference process descriptor.
293 ******************************************************************************************
294 * @ pathname   : pathname (can be relative or absolute).
295 * @ return 0 if success / returns -1 if failure.
296 *****************************************************************************************/
297int sys_chdir( char * pathname );
298
299/******************************************************************************************
300 * [21] This function creates a new directory in file system.
301 ******************************************************************************************
302 * @ pathname   : pathname (can be relative or absolute).
303 * @ mode       : access rights (as defined in chmod).
304 * @ return 0 if success / returns -1 if failure.
305 *****************************************************************************************/
306int sys_mkdir( char    * pathname,
307               uint32_t  mode );
308
309/******************************************************************************************
310 * [22] This function creates a named FIFO file in the calling thread cluster.
311 * The associated read and write file descriptors mut be be  explicitely created
312 * using the sys_open() function.
313 ******************************************************************************************
314 * @ pathname   : pathname (can be relative or absolute).
315 * @ mode       : access rights (as defined in chmod).
316 * @ return 0 if success / returns -1 if failure.
317 *****************************************************************************************/
318int sys_mkfifo( char     * pathname,
319                uint32_t   mode );
320
321/******************************************************************************************
322 * [23] This function open a directory, that must exist in the file system, returning
323 * a DIR pointer on the directory in user space.
324 ******************************************************************************************
325 * @ pathname   : pathname (can be relative or absolute).
326 * @ dirp       : [out] buffer for pointer on user directory (DIR).
327 * @ return 0 if success / returns -1 if failure.
328 *****************************************************************************************/
329int sys_opendir( char * pathname,
330                 DIR ** dirp );
331
332/******************************************************************************************
333 * [24] This function returns an user pointer on the dirent structure describing the
334 * next directory entry in the directory identified by the <dirp> argument.
335 ******************************************************************************************
336 * @ dirp     : user pointer identifying the searched directory.
337 * @ dentp    : [out] buffer for pointer on user direntory entry (dirent).
338 * @ return O if success / returns -1 if failure.
339 *****************************************************************************************/
340int sys_readdir( DIR            * dirp,
341                 struct dirent ** dentp );
342
343/******************************************************************************************
344 * [25] This function closes the directory identified by the <dirp> argument, and releases
345 * all structures associated with the <dirp> pointer.
346 ******************************************************************************************
347 * @ dirp     : user pointer identifying the directory.
348 * @ return 0 if success / returns -1 if failure.
349 *****************************************************************************************/
350int sys_closedir( DIR * dirp );
351
352/******************************************************************************************
353 * [26] This function returns the pathname of the current working directory.
354 ******************************************************************************************
355 * buf     : buffer addres in user space.
356 * nbytes  : user buffer size in bytes.
357 * @ return 0 if success / returns -1 if failure.
358 *****************************************************************************************/
359int sys_getcwd( char     * buf,
360                uint32_t   nbytes );
361
362/******************************************************************************************
363 * [27] This function tests whether a given file descriptor dentified by the <file_id>
364 * argument is an open file descriptor referring to a terminal.
365 ******************************************************************************************
366 * @ file_id   : file descriptor index
367 * @ return 1 if it is a TXT device / return 0 if it is not a TXT device.
368 *****************************************************************************************/
369int sys_isatty( uint32_t file_id );
370
371/******************************************************************************************
372 * [28] This function forces the calling thread to sleep, for a fixed number of cycles.
373 ******************************************************************************************
374 * cycles   : number of cycles.
375 *****************************************************************************************/
376int sys_alarm( uint32_t cycles );
377
378/******************************************************************************************
379 * [29] This function removes a directory file whose name is given by <pathname>.
380 * The directory must not have any entries other than `.' and `..'.
381 ******************************************************************************************
382 * @ pathname   : pathname (can be relative or absolute).
383 * @ return 0 if success / returns -1 if failure.
384 *****************************************************************************************/
385int sys_rmdir( char * pathname ); 
386
387/******************************************************************************************
388 * [30] This function implement the operations related to User Thread Local Storage.
389 * It is actually implemented as an uint32_t variable in the thread descriptor.
390 ******************************************************************************************
391 * @ operation  : UTLS operation type as defined below.
392 * @ value      : argument value for the UTLS_SET operation.
393 * @ return value for the UTLS_GET and UTLS_GET_ERRNO / return -1 if failure.
394 *****************************************************************************************/
395int sys_utls( uint32_t operation,
396              uint32_t value );
397
398/******************************************************************************************
399 * [31] This function change the acces rights for the file/dir identified by the
400 * pathname argument.
401 ******************************************************************************************
402 * @ pathname   : pathname (can be relative or absolute).
403 * @ rights     : acces rights.
404 * @ return 0 if success / returns -1 if failure.
405 *****************************************************************************************/
406int sys_chmod( char     * pathname,
407               uint32_t   rights );
408
409/******************************************************************************************
410 * [32] This function associate a specific signal handler to a given signal type.
411 * Tee handlers for the SIGKILL and SIGSTOP signals cannot be redefined.
412 ******************************************************************************************
413 * @ sig_id    : index defining signal type (from 1 to 31).
414 * @ handler   : pointer on fonction implementing the specific handler.
415 * @ return 0 if success / returns -1 if failure.
416 *****************************************************************************************/
417int sys_signal( uint32_t   sig_id,
418                void     * handler );
419
420/******************************************************************************************
421 * [33] This function returns in the structure <tv>, defined in the time.h file,
422 * the current time (in seconds & micro-seconds).
423 * It is computed from the calling core descriptor.
424 * The timezone is not supported.
425 ******************************************************************************************
426 * @ tv      : pointer on the timeval structure.
427 * @ tz      : pointer on the timezone structure : must be NULL.       
428 * @ return 0 if success / returns -1 if failure.
429 *****************************************************************************************/
430int sys_timeofday( struct timeval  * tv,
431                   struct timezone * tz );
432
433/******************************************************************************************
434 * [34] This function implements the "kill" system call on the kernel side.
435 * It register the signal defined by the <sig_id> argument in all thread descriptors
436 * of a target process identified by the <pid> argument. This is done in all clusters
437 * containing threads for the target process.
438 * It can be executed by any thread running in any cluster, as this function uses
439 * remote access to traverse the list of process copies stored in the owner cluster,
440 * and the RPC_SIGNAL_RISE to signal the remote threads.
441 * This function does nothing for (sig_id == 0). This can be used to check process pid.
442 * TODO : This first implementation supports only SIGKILL / SIGSTOP / SIGCONT values.
443 ******************************************************************************************
444 * @ pid      : target process identifier.
445 * @ sig_id   : index defining the signal type.
446 * @ return 0 if success / returns -1 if failure.
447 *****************************************************************************************/
448int sys_kill( pid_t    pid,
449              uint32_t sig_id );
450
451/******************************************************************************************
452 * [35] This function implements the "getpid" system call on the kernel side.
453 ******************************************************************************************
454 * @ returns the process PID for the calling thread.
455 *****************************************************************************************/
456int sys_getpid( void );
457
458/******************************************************************************************
459 * [36] This function implement the "fork" system call on the kernel side.
460 * The calling process descriptor (parent process), and the associated thread descriptor
461 * are replicated in a - likely - remote cluster, that becomes the child process owner.
462 * The child process get a new PID, and is linked to the parent PID. The child process
463 * inherit from its parent the memory image, and all open files (including the TXT).
464 * The child process becomes the TXT terminal owner.
465 * The target cluster depends on the "fork_user" flag and "fork_cxy" variable that can be
466 * stored in the calling thread descriptor by the specific fork_place() system call.
467 * If not, the kernel function makes a query to the DQDT to select the target cluster.
468 ******************************************************************************************
469 * @ if success, returns child process PID to parent, and return O to child.
470 * @ if failure, returns -1 to parent / no child process is created.
471 *****************************************************************************************/
472int sys_fork( void );
473
474/******************************************************************************************
475 * [37] This function implement the "exec" system call on the kernel side.
476 * It creates, in the same cluster as the calling thread, a new process descriptor,
477 * and a new associated main thread descriptor, executing a new memory image defined
478 * by the <filename> argument. This new process inherit from the old process the PID
479 * and the PPID, as well as all open files (including the TXT).
480 * The old process descriptor, and all its threads are blocked, and marked for deletion.
481 * Therefore the exec syscall does not return to the calling thread in case of success.
482 * This function build an exec_info_t structure containing the new process arguments,
483 * as defined by the <arv> argument, and the new process environment variables,
484 * as defined by the <envp>  argument.
485 * TODO : the <argv> and <envp> arguments are not supported yet (both must be NULL).
486 ******************************************************************************************
487 * @ filename : string pointer on .elf filename (pointer in user space)
488 * @ argv     : array of strings on process arguments (pointers in user space)
489 * @ envp     : array of strings on environment variables (pointers in user space)
490 * @ does not return if success / returns -1 if failure.
491 *****************************************************************************************/
492int sys_exec( char  * filename,
493              char ** argv,
494              char ** envp );
495
496/******************************************************************************************
497 * [38] This function  returns in the <stat> structure, defined in the "shared_syscalls.h"
498 * file, various informations on the file/directory identified by the <pathname> argument.
499 ******************************************************************************************
500 * @ pathname  : user pointer on file pathname.
501 * @ stat      : user pointer on the stat structure.
502 * @ returns O if success / returns -1 if failure.
503 *****************************************************************************************/
504int sys_stat( const char  * pathname,
505              struct stat * stat );
506
507/******************************************************************************************
508 * [39] This blocking function waits a change of a child process state, that can be:
509 * - a termination of child following a process_make_exit().
510 * - a termination of child following a process_make_kill().
511 * - a blocking of child following a SIGSTOP signal.
512 * In case of a multi-thread process, this function must be called by the main thread
513 * runningin the reference cluster.
514 * When a change has been observed, it returns the PID of the child process, and stores
515 * in the <status> argument relevant information on the child state change.
516 * The following macros can be used to extract information from status:
517 * - WIFEXITED(status)   : is true if the child process terminated with an exit().
518 * - WIFSIGNALED(status) : is true if the child process killed by a signal.
519 * - WIFSTOPPED(status)  : is true if the child process is stopped by a signal.
520 * - WEXITSTATUS(status) : returns the low-order 8 bits of the exit() argument.
521 * If a parent process terminates without waiting for all child processes to terminate,
522 * the remaining child processes are attached to the init process.
523 * WARNING: negative values for the <pid> argument are not supported.
524 ******************************************************************************************
525 * @ searched_pid : searched child process identifier.
526 * @ status       : [out] child termination status.
527 * @ return child PID if success / return -1 if searched PID not found.
528 *****************************************************************************************/
529int sys_wait( uint32_t * status );
530
531/******************************************************************************************
532 * [40] This function returns the hardware platform parameters.
533 ******************************************************************************************
534 * @ x_size   : [out] number of clusters in a row.
535 * @ y_size   : [out] number of clusters in a column.
536 * @ y_width  : [out] number of bits in Y field for CXY.
537 * @ ncores   : [out] number of cores per cluster.
538 * @ return 0 if success / return -1 if illegal arguments
539 *****************************************************************************************/
540int sys_get_config( uint32_t * x_size,
541                    uint32_t * y_size,
542                    uint32_t * y_width,
543                    uint32_t * ncores );
544
545/******************************************************************************************
546 * [41] This function returns the calling core cluster and local index.
547 ******************************************************************************************
548 * @ cxy      : [out] cluster identifier (fixed format)
549 * @ lid      : [out] core local index in cluster.
550 * @ return 0 if success / return -1 if illegal arguments
551 *****************************************************************************************/
552int sys_get_core( uint32_t * cxy,
553                  uint32_t * lid );
554
555/******************************************************************************************
556 * [42] This function returns in a 64 bits user buffer the calling core cycles count.
557 * It uses both the hardware register and the core descriptor cycles count to take
558 * into account a possible harware register overflow  in 32 bits architectures.
559 ******************************************************************************************
560 * cycle    : [out] address of buffer in user space.
561 * @ return 0 if success / return -1 if illegal arguments
562 *****************************************************************************************/
563int sys_get_cycle( uint64_t * cycle );
564
565/******************************************************************************************
566 * [43] This debug function displays on the kernel terminal TXT0 an user defined string,
567 * or the current state of a kernel structure, identified by the <type> argument.
568 * The <arg0> and <arg1> arguments depends on the structure type:
569 * - DISPLAY_STRING          : an user defined string
570 * - DISPLAY_VMM             : VSL and GPT for a process identified by <pid>.
571 * - DISPLAY_SCHED           : all threads allocated to a scheduler <cxy> & <lid>.
572 * - DISPLAY_CLUSTER_PROCESS : all processes registered in a cluster identified by <cxy>. 
573 * - DISPLAY_TXT_PROCESS     : all processes registered in a cluster identified by <cxy>. 
574 * - DISPLAY_VFS             : all files registered in the VFS cache.
575 * - DISPLAY_CHDEV           : all registered channel devices.
576 * - DISPLAY_DQDT            : all DQDT nodes.
577 ******************************************************************************************
578 * type      : [in] type of display
579 * arg0      : [in] type dependant argument.
580 * arg1      : [in] type dependant argument.
581 * @ return 0 if success / return -1 if illegal arguments
582 *****************************************************************************************/
583int sys_display( reg_t  type,
584                 reg_t  arg0,
585                 reg_t  arg1 );
586
587/******************************************************************************************
588 * [44] TBD
589 ******************************************************************************************
590 * @ cxy    : cluster identifier.
591 * @ lid    : core local index.
592 * @ return 0 if success / return -1 if failure.
593 *****************************************************************************************/
594int sys_place( uint32_t cxy,
595               uint32_t lid );
596
597/******************************************************************************************
598 * [45] This function block the calling thread on the THREAD_BLOCKED_GLOBAL condition,
599 * and deschedule.
600 ******************************************************************************************
601 * @ return 0 if success / returns -1 if failure.
602 *****************************************************************************************/
603int sys_thread_sleep( void );
604
605/******************************************************************************************
606 * [46] This function unblock the thread identified by its <trdid> from the
607 * THREAD_BLOCKED_GLOBAL condition.
608 ******************************************************************************************
609 * @ trdid  : target thread identifier.
610 * @ return 0 if success / return -1 if failure.
611 *****************************************************************************************/
612int sys_thread_wakeup( void );
613
614/******************************************************************************************
615 * [47] This debug function is used to activate / desactivate the context switches trace
616 * for a core identified by the <cxy> and <lid> arguments.
617 * It can be called by any other thread in the same process.
618 ******************************************************************************************
619 * @ active     : activate trace if true / desactivate trace if false.
620 * @ cxy        : cluster identifier.
621 * @ lid        : core local index.
622 * @ returns O if success / returns -1 if failure.
623 *****************************************************************************************/
624int sys_trace( bool_t   active,
625               cxy_t    cxy, 
626               lid_t    lid );
627
628/******************************************************************************************
629 * [48] This function gives the process identified by the <pid> argument
630 * the exclusive ownership of its TXT_TX terminal (put it in foreground).
631 ******************************************************************************************
632 * @ pid    : process identifier.
633 * @ return 0 if success / return -1 if failure.
634 *****************************************************************************************/
635int sys_fg( pid_t   pid );
636
637/******************************************************************************************
638 * [49] This function returns a non-zero value in the <is_fg> buffer when the process
639 * identified by the <pid> argument is the current TXT owner.
640 ******************************************************************************************
641 * @ pid      : process identifier.
642 * @ is_fg    : pointer on buffer.
643 * @ return 0 if success / return -1 if failure.
644 *****************************************************************************************/
645int sys_is_fg( pid_t      pid,
646               uint32_t * is_fg );
647
648#endif  // _SYSCALLS_H_
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