source: trunk/kernel/syscalls/syscalls.h @ 600

Last change on this file since 600 was 594, checked in by alain, 6 years ago

Fix various bugs in sys_stat() and sys_mmap() functions.
Improve debug in other functions.
File size: 38.6 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 * @ trdid_ptr   : [out] pointer on buffer for created thread trdid.
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( trdid_t               * trdid_ptr,
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 condvar is defined in the remote_condvar.h file,
132 * The code implementing the operations is defined in the remote_condvar.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 * The user defined virtual address (MAP_FIXED flag) is not supported.
211 * TODO : the access rights checking is not implemented yet [AG]
212 * TODO : the Copy on Write for MAP_PRIVATE is not implemented yet [AG]
213 ******************************************************************************************
214 * @ attr       : pointer on attributes structure.
215 * @ return 0 if success / return -1 if failure.
216 *****************************************************************************************/
217int sys_mmap( mmap_attr_t * attr );
218
219/******************************************************************************************
220 * [14] This function read bytes from an open file identified by its file descriptor.
221 * The file can be a regular file or character oriented device.
222 * IRQs are enabled during this system call.
223 ******************************************************************************************
224 * @ file_id  : open file index in fd_array.
225 * @ buf      : buffer virtual address in user space.
226 * @ count    : number of bytes.
227 * @ return number of bytes actually read if success / returns -1 if failure.
228 *****************************************************************************************/
229int sys_read( uint32_t   file_id,
230              void     * buf,
231              uint32_t   count );
232
233/******************************************************************************************
234 * [15] This function writes bytes to an open file identified by its file descriptor.
235 * The file can be a regular file or character oriented device.
236 * IRQs are enabled during this system call.
237 ******************************************************************************************
238 * @ file_id  : open file index in fd_array.
239 * @ buf      : buffer virtual address in user space.
240 * @ count    : number of bytes.
241 * @ return number of bytes actually written if success / returns -1 if failure.
242 *****************************************************************************************/
243int sys_write( uint32_t   file_id,
244               void     * buf,
245               uint32_t   count );
246
247/******************************************************************************************
248 * [16] This function repositions the offset of the file descriptor identified by <file_id>,
249 * according to the operation type defined by the <whence> argument.
250 ******************************************************************************************
251 * @ file_id  : open file index in fd_array.
252 * @ offset   : used to compute new offset value.
253 * @ whence   : operation type (see below).
254 * @ return 0 if success / returns -1 if failure.
255 *****************************************************************************************/
256int sys_lseek( xptr_t    file_id,
257               uint32_t  offset,
258               uint32_t  whence );
259
260/******************************************************************************************
261 * [17] This function release the memory allocated for the file descriptor identified by
262 * the <file_id> argument, and remove the fd array_entry in all copies of the process
263 * descriptor.
264 ******************************************************************************************
265  file_id   : file descriptor index in fd_array.
266 * @ return 0 if success / returns -1 if failure.
267 *****************************************************************************************/
268int sys_close( uint32_t file_id );
269
270/******************************************************************************************
271 * [18] This function removes a directory entry identified by the <pathname> from the
272 * directory, and decrement the link count of the file referenced by the link.
273 * If the link count reduces to zero, and no process has the file open, then all resources
274 * associated with the file are reclaimed.  If one or more process have the file open when
275 * the last link is removed, the link is removed, but the removal of the file is delayed
276 * until all references to it have been closed.
277 ******************************************************************************************
278 * @ pathname   : pathname (can be relative or absolute).
279 * @ return 0 if success / returns -1 if failure.
280 *****************************************************************************************/
281int sys_unlink( char * pathname );
282
283/******************************************************************************************
284 * [19] This function creates in the calling thread cluster an unnamed pipe, and two
285 * (read and write) file descriptors.
286 * TODO not implemented yet [AG]
287 ******************************************************************************************
288 * @ file_id[0] : [out] read only file descriptor index.
289 * @ file_id[1] : [out] write only file descriptor index.
290 * @ return 0 if success / return -1 if failure.
291 *****************************************************************************************/
292int sys_pipe( uint32_t file_id[2] );
293
294/******************************************************************************************
295 * [20] This function change the current working directory in reference process descriptor.
296 ******************************************************************************************
297 * @ pathname   : pathname (can be relative or absolute).
298 * @ return 0 if success / returns -1 if failure.
299 *****************************************************************************************/
300int sys_chdir( char * pathname );
301
302/******************************************************************************************
303 * [21] This function creates a new directory in file system.
304 ******************************************************************************************
305 * @ pathname   : pathname (can be relative or absolute).
306 * @ mode       : access rights (as defined in chmod).
307 * @ return 0 if success / returns -1 if failure.
308 *****************************************************************************************/
309int sys_mkdir( char    * pathname,
310               uint32_t  mode );
311
312/******************************************************************************************
313 * [22] This function creates a named FIFO file in the calling thread cluster.
314 * The associated read and write file descriptors mut be be  explicitely created
315 * using the sys_open() function.
316 ******************************************************************************************
317 * @ pathname   : pathname (can be relative or absolute).
318 * @ mode       : access rights (as defined in chmod).
319 * @ return 0 if success / returns -1 if failure.
320 *****************************************************************************************/
321int sys_mkfifo( char     * pathname,
322                uint32_t   mode );
323
324/******************************************************************************************
325 * [23] This function open a directory, that must exist in the file system, returning
326 * a DIR pointer on the directory in user space.
327 ******************************************************************************************
328 * @ pathname   : pathname (can be relative or absolute).
329 * @ dirp       : [out] buffer for pointer on user directory (DIR).
330 * @ return 0 if success / returns -1 if failure.
331 *****************************************************************************************/
332int sys_opendir( char * pathname,
333                 DIR ** dirp );
334
335/******************************************************************************************
336 * [24] This function returns an user pointer on the dirent structure describing the
337 * next directory entry in the directory identified by the <dirp> argument.
338 ******************************************************************************************
339 * @ dirp     : user pointer identifying the searched directory.
340 * @ dentp    : [out] buffer for pointer on user direntory entry (dirent).
341 * @ return O if success / returns -1 if failure.
342 *****************************************************************************************/
343int sys_readdir( DIR            * dirp,
344                 struct dirent ** dentp );
345
346/******************************************************************************************
347 * [25] This function closes the directory identified by the <dirp> argument, and releases
348 * all structures associated with the <dirp> pointer.
349 ******************************************************************************************
350 * @ dirp     : user pointer identifying the directory.
351 * @ return 0 if success / returns -1 if failure.
352 *****************************************************************************************/
353int sys_closedir( DIR * dirp );
354
355/******************************************************************************************
356 * [26] This function returns the pathname of the current working directory.
357 ******************************************************************************************
358 * buf     : buffer addres in user space.
359 * nbytes  : user buffer size in bytes.
360 * @ return 0 if success / returns -1 if failure.
361 *****************************************************************************************/
362int sys_getcwd( char     * buf,
363                uint32_t   nbytes );
364
365/******************************************************************************************
366 * [27] This function tests whether a given file descriptor dentified by the <file_id>
367 * argument is an open file descriptor referring to a terminal.
368 ******************************************************************************************
369 * @ file_id   : file descriptor index
370 * @ return 1 if it is a TXT device / return 0 if it is not a TXT device.
371 *****************************************************************************************/
372int sys_isatty( uint32_t file_id );
373
374/******************************************************************************************
375 * [28] This function forces the calling thread to sleep, for a fixed number of cycles.
376 ******************************************************************************************
377 * cycles   : number of cycles.
378 *****************************************************************************************/
379int sys_alarm( uint32_t cycles );
380
381/******************************************************************************************
382 * [29] This function removes a directory file whose name is given by <pathname>.
383 * The directory must not have any entries other than `.' and `..'.
384 ******************************************************************************************
385 * @ pathname   : pathname (can be relative or absolute).
386 * @ return 0 if success / returns -1 if failure.
387 *****************************************************************************************/
388int sys_rmdir( char * pathname );
389
390/******************************************************************************************
391 * [30] This function implement the operations related to User Thread Local Storage.
392 * It is actually implemented as an uint32_t variable in the thread descriptor.
393 ******************************************************************************************
394 * @ operation  : UTLS operation type as defined below.
395 * @ value      : argument value for the UTLS_SET operation.
396 * @ return value for the UTLS_GET and UTLS_GET_ERRNO / return -1 if failure.
397 *****************************************************************************************/
398int sys_utls( uint32_t operation,
399              uint32_t value );
400
401/******************************************************************************************
402 * [31] This function change the acces rights for the file/dir identified by the
403 * pathname argument.
404 ******************************************************************************************
405 * @ pathname   : pathname (can be relative or absolute).
406 * @ rights     : acces rights.
407 * @ return 0 if success / returns -1 if failure.
408 *****************************************************************************************/
409int sys_chmod( char       * pathname,
410               uint32_t     rights );
411
412/******************************************************************************************
413 * [32] This function associate a specific signal handler to a given signal type.
414 * The handlers for the SIGKILL and SIGSTOP signals cannot be redefined.
415 ******************************************************************************************
416 * @ sig_id    : index defining signal type (from 1 to 31).
417 * @ handler   : pointer on fonction implementing the specific handler.
418 * @ return 0 if success / returns -1 if failure.
419 *****************************************************************************************/
420int sys_signal( uint32_t   sig_id,
421                void     * handler );
422
423/******************************************************************************************
424 * [33] This function returns in the structure <tv>, defined in the time.h file,
425 * the current time (in seconds & micro-seconds).
426 * It is computed from the calling core descriptor.
427 * The timezone is not supported.
428 ******************************************************************************************
429 * @ tv      : pointer on the timeval structure.
430 * @ tz      : pointer on the timezone structure : must be NULL.       
431 * @ return 0 if success / returns -1 if failure.
432 *****************************************************************************************/
433int sys_timeofday( struct timeval  * tv,
434                   struct timezone * tz );
435
436/******************************************************************************************
437 * [34] This function implements the "kill" system call on the kernel side.
438 * It register the signal defined by the <sig_id> argument in all thread descriptors
439 * of a target process identified by the <pid> argument. This is done in all clusters
440 * containing threads for the target process.
441 * It can be executed by any thread running in any cluster, as this function uses
442 * remote access to traverse the list of process copies stored in the owner cluster,
443 * and the RPC_SIGNAL_RISE to signal the remote threads.
444 * This function does nothing for (sig_id == 0). This can be used to check process pid.
445 * TODO : This first implementation supports only SIGKILL / SIGSTOP / SIGCONT values.
446 ******************************************************************************************
447 * @ pid      : target process identifier.
448 * @ sig_id   : index defining the signal type.
449 * @ return 0 if success / returns -1 if failure.
450 *****************************************************************************************/
451int sys_kill( pid_t    pid,
452              uint32_t sig_id );
453
454/******************************************************************************************
455 * [35] This function implements the "getpid" system call on the kernel side.
456 ******************************************************************************************
457 * @ returns the process PID for the calling thread.
458 *****************************************************************************************/
459int sys_getpid( void );
460
461/******************************************************************************************
462 * [36] This function implement the "fork" system call on the kernel side.
463 * The calling process descriptor (parent process), and the associated thread descriptor
464 * are replicated in a - likely - remote cluster, that becomes the child process owner.
465 * The child process get a new PID, and is linked to the parent PID. The child process
466 * inherit from its parent the memory image, and all open files (including the TXT).
467 * The child process becomes the TXT terminal owner.
468 * The target cluster depends on the "fork_user" flag and "fork_cxy" variable that can be
469 * stored in the calling thread descriptor by the specific fork_place() system call.
470 * If not, the kernel function makes a query to the DQDT to select the target cluster.
471 ******************************************************************************************
472 * @ if success, returns child process PID to parent, and return O to child.
473 * @ if failure, returns -1 to parent / no child process is created.
474 *****************************************************************************************/
475int sys_fork( void );
476
477/******************************************************************************************
478 * [37] This function implement the "exec" system call on the kernel side.
479 * It creates, in the same cluster as the calling thread, a new process descriptor,
480 * and a new associated main thread descriptor, executing a new memory image defined
481 * by the <filename> argument. This new process inherit from the old process the PID
482 * and the PPID, as well as all open files (including the TXT).
483 * The old process descriptor, and all its threads are blocked, and marked for deletion.
484 * Therefore the exec syscall does not return to the calling thread in case of success.
485 * This function build an exec_info_t structure containing the new process arguments,
486 * as defined by the <arv> argument, and the new process environment variables,
487 * as defined by the <envp>  argument.
488 * TODO : the <argv> and <envp> arguments are not supported yet (both must be NULL).
489 ******************************************************************************************
490 * @ filename : string pointer on .elf filename (pointer in user space)
491 * @ argv     : array of strings on process arguments (pointers in user space)
492 * @ envp     : array of strings on environment variables (pointers in user space)
493 * @ does not return if success / returns -1 if failure.
494 *****************************************************************************************/
495int sys_exec( char  * filename,
496              char ** argv,
497              char ** envp );
498
499/******************************************************************************************
500 * [38] This function  returns in the <stat> structure, defined in the "shared_syscalls.h"
501 * file, various informations on the file/directory identified by the <pathname> argument.
502 * TODO only the <st_ino>, <st_mode>,<st_uid>,<st_gid>,<st_size> are set.
503 ******************************************************************************************
504 * @ pathname  : user pointer on file pathname.
505 * @ stat      : user pointer on the stat structure.
506 * @ returns O if success / returns -1 if failure.
507 *****************************************************************************************/
508int sys_stat( char        * pathname,
509              struct stat * stat );
510
511/******************************************************************************************
512 * [39] This blocking function waits a change of a child process state, that can be:
513 * - a termination of child following a process_make_exit().
514 * - a termination of child following a process_make_kill().
515 * - a blocking of child following a SIGSTOP signal.
516 * In case of a multi-thread process, this function must be called by the main thread
517 * runningin the reference cluster.
518 * When a change has been observed, it returns the PID of the child process, and stores
519 * in the <status> argument relevant information on the child state change.
520 * The following macros can be used to extract information from status:
521 * - WIFEXITED(status)   : is true if the child process terminated with an exit().
522 * - WIFSIGNALED(status) : is true if the child process killed by a signal.
523 * - WIFSTOPPED(status)  : is true if the child process is stopped by a signal.
524 * - WEXITSTATUS(status) : returns the low-order 8 bits of the exit() argument.
525 * If a parent process terminates without waiting for all child processes to terminate,
526 * the remaining child processes are attached to the init process.
527 * WARNING: negative values for the <pid> argument are not supported.
528 ******************************************************************************************
529 * @ searched_pid : searched child process identifier.
530 * @ status       : [out] child termination status.
531 * @ return child PID if success / return -1 if searched PID not found.
532 *****************************************************************************************/
533int sys_wait( uint32_t * status );
534
535/******************************************************************************************
536 * [40] This function implement the non-standard get_config() syscall.
537 * It returns in <x_size>, <y_size>, <ncores> the hardware platform parameters.
538 ******************************************************************************************
539 * @ x_size   : [out] number of clusters in a row.
540 * @ y_size   : [out] number of clusters in a column.
541 * @ ncores   : [out] number of cores per cluster.
542 * @ return 0 if success / return -1 if illegal arguments
543 *****************************************************************************************/
544int sys_get_config( uint32_t * x_size,
545                    uint32_t * y_size,
546                    uint32_t * ncores );
547
548/******************************************************************************************
549 * [41] This function implements the non-standard get_core() syscall.
550 * It returns in <cxy> and <lid> the calling core cluster and local index.
551 ******************************************************************************************
552 * @ cxy      : [out] cluster identifier (fixed format)
553 * @ lid      : [out] core local index in cluster.
554 * @ return 0 if success / return -1 if illegal arguments
555 *****************************************************************************************/
556int sys_get_core( uint32_t * cxy,
557                  uint32_t * lid );
558
559/******************************************************************************************
560 * [42] This function implements the non-standard get_cycle() syscall.
561 * It returns in a 64 bits user buffer the calling core cycles count.
562 * It uses both the hardware register and the core descriptor cycles count to take
563 * into account a possible harware register overflow  in 32 bits architectures.
564 ******************************************************************************************
565 * cycle    : [out] address of buffer in user space.
566 * @ return 0 if success / return -1 if illegal arguments
567 *****************************************************************************************/
568int sys_get_cycle( uint64_t * cycle );
569
570/******************************************************************************************
571 * [43] This debug function displays on the kernel terminal TXT0 an user defined string,
572 * or the current state of a kernel structure, identified by the <type> argument.
573 * The <arg0> and <arg1> arguments depends on the structure type:
574 * - DISPLAY_STRING          : an user defined string
575 * - DISPLAY_VMM             : VSL and GPT for a process identified by <pid>.
576 * - DISPLAY_SCHED           : all threads allocated to a scheduler <cxy> & <lid>.
577 * - DISPLAY_CLUSTER_PROCESS : all processes registered in a cluster identified by <cxy>. 
578 * - DISPLAY_TXT_PROCESS     : all processes registered in a cluster identified by <cxy>. 
579 * - DISPLAY_VFS             : all files registered in the VFS cache.
580 * - DISPLAY_CHDEV           : all registered channel devices.
581 * - DISPLAY_DQDT            : all DQDT nodes.
582 ******************************************************************************************
583 * type      : [in] type of display
584 * arg0      : [in] type dependant argument.
585 * arg1      : [in] type dependant argument.
586 * @ return 0 if success / return -1 if illegal arguments
587 *****************************************************************************************/
588int sys_display( reg_t  type,
589                 reg_t  arg0,
590                 reg_t  arg1 );
591
592/******************************************************************************************
593 * [44] This function implements the non-standard place_fork() syscall.
594 * It can be used to specify the target cluster <cxy> for a new process created
595 * by a subsequent fork() syscall.
596 * WARNING: it must be called before each fork() syscall, as the placement specification
597 *          is reset by the fork syscall.
598 ******************************************************************************************
599 * @ cxy    : cluster identifier.
600 * @ return 0 if success / return -1 if failure.
601 *****************************************************************************************/
602int sys_place_fork( uint32_t cxy );
603
604/******************************************************************************************
605 * [45] This function block the calling thread on the THREAD_BLOCKED_GLOBAL condition,
606 * and deschedule.
607 ******************************************************************************************
608 * @ return 0 if success / returns -1 if failure.
609 *****************************************************************************************/
610int sys_thread_sleep( void );
611
612/******************************************************************************************
613 * [46] This function unblock the thread identified by its <trdid> from the
614 * THREAD_BLOCKED_GLOBAL condition.
615 ******************************************************************************************
616 * @ trdid  : target thread identifier.
617 * @ return 0 if success / return -1 if failure.
618 *****************************************************************************************/
619int sys_thread_wakeup( trdid_t trdid );
620
621/******************************************************************************************
622 * [47] This debug function is used to activate / desactivate the context switches trace
623 * for a core identified by the <cxy> and <lid> arguments.
624 * It can be called by any other thread in the same process.
625 ******************************************************************************************
626 * @ active     : activate trace if true / desactivate trace if false.
627 * @ cxy        : cluster identifier.
628 * @ lid        : core local index.
629 * @ returns O if success / returns -1 if failure.
630 *****************************************************************************************/
631int sys_trace( bool_t   active,
632               cxy_t    cxy, 
633               lid_t    lid );
634
635/******************************************************************************************
636 * [48] This function gives the process identified by the <pid> argument
637 * the exclusive ownership of its TXT_TX terminal (put it in foreground).
638 ******************************************************************************************
639 * @ pid    : process identifier.
640 * @ return 0 if success / return -1 if failure.
641 *****************************************************************************************/
642int sys_fg( pid_t   pid );
643
644/******************************************************************************************
645 * [49] This function returns a non-zero value in the <is_fg> buffer when the process
646 * identified by the <pid> argument is the current TXT owner.
647 ******************************************************************************************
648 * @ pid      : process identifier.
649 * @ is_fg    : pointer on buffer.
650 * @ return 0 if success / return -1 if failure.
651 *****************************************************************************************/
652int sys_is_fg( pid_t      pid,
653               uint32_t * is_fg );
654
655#endif  // _SYSCALLS_H_
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