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source: trunk/kernel/kern/process.c @ 617

Last change on this file since 617 was 611, checked in by alain, 6 years ago
Introduce sigificant modifs in VFS to support the <ls> command, and the . and .. directories entries.
File size: 77.5 KB

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1	/*
2	* process.c - process related functions definition.
3	*
4	* Authors Ghassan Almaless (2008,2009,2010,2011,2012)
5	* Mohamed Lamine Karaoui (2015)
6	* Alain Greiner (2016,2017,2018)
7	*
8	* Copyright (c) UPMC Sorbonne Universites
9	*
10	* This file is part of ALMOS-MKH.
11	*
12	* ALMOS-MKH is free software; you can redistribute it and/or modify it
13	* under the terms of the GNU General Public License as published by
14	* the Free Software Foundation; version 2.0 of the License.
15	*
16	* ALMOS-MKH is distributed in the hope that it will be useful, but
17	* WITHOUT ANY WARRANTY; without even the implied warranty of
18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19	* General Public License for more details.
20	*
21	* You should have received a copy of the GNU General Public License
22	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
23	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24	*/
25
26	#include <kernel_config.h>
27	#include <hal_kernel_types.h>
28	#include <hal_remote.h>
29	#include <hal_uspace.h>
30	#include <hal_irqmask.h>
31	#include <errno.h>
32	#include <printk.h>
33	#include <memcpy.h>
34	#include <bits.h>
35	#include <kmem.h>
36	#include <page.h>
37	#include <vmm.h>
38	#include <vfs.h>
39	#include <core.h>
40	#include <thread.h>
41	#include <chdev.h>
42	#include <list.h>
43	#include <string.h>
44	#include <scheduler.h>
45	#include <busylock.h>
46	#include <queuelock.h>
47	#include <remote_queuelock.h>
48	#include <rwlock.h>
49	#include <remote_rwlock.h>
50	#include <dqdt.h>
51	#include <cluster.h>
52	#include <ppm.h>
53	#include <boot_info.h>
54	#include <process.h>
55	#include <elf.h>
56	#include <syscalls.h>
57	#include <shared_syscalls.h>
58
59	//////////////////////////////////////////////////////////////////////////////////////////
60	// Extern global variables
61	//////////////////////////////////////////////////////////////////////////////////////////
62
63	extern process_t process_zero; // allocated in kernel_init.c
64	extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
65
66	//////////////////////////////////////////////////////////////////////////////////////////
67	// Process initialisation related functions
68	//////////////////////////////////////////////////////////////////////////////////////////
69
70	/////////////////////////////////
71	process_t * process_alloc( void )
72	{
73	kmem_req_t req;
74
75	req.type = KMEM_PROCESS;
76	req.size = sizeof(process_t);
77	req.flags = AF_KERNEL;
78
79	return (process_t *)kmem_alloc( &req );
80	}
81
82	////////////////////////////////////////
83	void process_free( process_t * process )
84	{
85	kmem_req_t req;
86
87	req.type = KMEM_PROCESS;
88	req.ptr = process;
89	kmem_free( &req );
90	}
91
92	/////////////////////////////////////////////////
93	void process_reference_init( process_t * process,
94	pid_t pid,
95	xptr_t parent_xp )
96	{
97	xptr_t process_xp;
98	cxy_t parent_cxy;
99	process_t * parent_ptr;
100	xptr_t stdin_xp;
101	xptr_t stdout_xp;
102	xptr_t stderr_xp;
103	uint32_t stdin_id;
104	uint32_t stdout_id;
105	uint32_t stderr_id;
106	error_t error;
107	uint32_t txt_id;
108	char rx_path[40];
109	char tx_path[40];
110	xptr_t file_xp;
111	xptr_t chdev_xp;
112	chdev_t * chdev_ptr;
113	cxy_t chdev_cxy;
114	pid_t parent_pid;
115
116	// build extended pointer on this reference process
117	process_xp = XPTR( local_cxy , process );
118
119	// get parent process cluster and local pointer
120	parent_cxy = GET_CXY( parent_xp );
121	parent_ptr = GET_PTR( parent_xp );
122
123	// get parent_pid
124	parent_pid = hal_remote_l32( XPTR( parent_cxy , &parent_ptr->pid ) );
125
126	#if DEBUG_PROCESS_REFERENCE_INIT
127	thread_t * this = CURRENT_THREAD;
128	uint32_t cycle = (uint32_t)hal_get_cycles();
129	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
130	printk("\n[%s] thread[%x,%x] enter to initalialize process %x / cycle %d\n",
131	__FUNCTION__, parent_pid, this->trdid, pid, cycle );
132	#endif
133
134	// initialize pid, ref_xp, parent_xp, owner_xp, term_state fields
135	process->pid = pid;
136	process->ref_xp = XPTR( local_cxy , process );
137	process->owner_xp = XPTR( local_cxy , process );
138	process->parent_xp = parent_xp;
139	process->term_state = 0;
140
141	// initialize VFS root inode and CWD inode
142	process->vfs_root_xp = hal_remote_l64( XPTR( parent_cxy, &parent_ptr->vfs_root_xp ) );
143	process->cwd_xp = hal_remote_l64( XPTR( parent_cxy, &parent_ptr->cwd_xp ) );
144
145	// initialize vmm as empty
146	error = vmm_init( process );
147
148	assert( (error == 0) , "cannot initialize VMM\n" );
149
150	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
151	cycle = (uint32_t)hal_get_cycles();
152	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
153	printk("\n[%s] thread[%x,%x] / vmm empty for process %x / cycle %d\n",
154	__FUNCTION__, parent_pid, this->trdid, pid, cycle );
155	#endif
156
157	// initialize fd_array as empty
158	process_fd_init( process );
159
160	// define the stdin/stdout/stderr pseudo files <=> select a TXT terminal.
161	if( (pid == 1) \|\| (parent_pid == 1) ) // INIT or KSH process
162	{
163	// select a TXT channel
164	if( pid == 1 ) txt_id = 0; // INIT
165	else txt_id = process_txt_alloc(); // KSH
166
167	// attach process to TXT
168	process_txt_attach( process , txt_id );
169
170	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
171	cycle = (uint32_t)hal_get_cycles();
172	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
173	printk("\n[%s] thread[%x,%x] / process %x attached to TXT%d / cycle %d\n",
174	__FUNCTION__, parent_pid, this->trdid, pid, txt_id, cycle );
175	#endif
176	// build path to TXT_RX[i] and TXT_TX[i] chdevs
177	snprintf( rx_path , 40 , "/dev/external/txt%d_rx", txt_id );
178	snprintf( tx_path , 40 , "/dev/external/txt%d_tx", txt_id );
179
180	// create stdin pseudo file
181	error = vfs_open( process->vfs_root_xp,
182	rx_path,
183	process_xp,
184	O_RDONLY,
185	0, // FIXME chmod
186	&stdin_xp,
187	&stdin_id );
188
189	assert( (error == 0) , "cannot open stdin pseudo file" );
190	assert( (stdin_id == 0) , "stdin index must be 0" );
191
192	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
193	cycle = (uint32_t)hal_get_cycles();
194	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
195	printk("\n[%s] thread[%x,%x] / stdin open for process %x / cycle %d\n",
196	__FUNCTION__, parent_pid, this->trdid, pid, cycle );
197	#endif
198
199	// create stdout pseudo file
200	error = vfs_open( process->vfs_root_xp,
201	tx_path,
202	process_xp,
203	O_WRONLY,
204	0, // FIXME chmod
205	&stdout_xp,
206	&stdout_id );
207
208	assert( (error == 0) , "cannot open stdout pseudo file" );
209	assert( (stdout_id == 1) , "stdout index must be 1" );
210
211	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
212	cycle = (uint32_t)hal_get_cycles();
213	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
214	printk("\n[%s] thread[%x,%x] / stdout open for process %x / cycle %d\n",
215	__FUNCTION__, parent_pid, this->trdid, pid, cycle );
216	#endif
217
218	// create stderr pseudo file
219	error = vfs_open( process->vfs_root_xp,
220	tx_path,
221	process_xp,
222	O_WRONLY,
223	0, // FIXME chmod
224	&stderr_xp,
225	&stderr_id );
226
227	assert( (error == 0) , "cannot open stderr pseudo file" );
228	assert( (stderr_id == 2) , "stderr index must be 2" );
229
230	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
231	cycle = (uint32_t)hal_get_cycles();
232	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
233	printk("\n[%s] thread[%x,%x] / stderr open for process %x / cycle %d\n",
234	__FUNCTION__, parent_pid, this->trdid, pid, cycle );
235	#endif
236
237	}
238	else // normal user process
239	{
240	// get extended pointer on stdin pseudo file in parent process
241	file_xp = (xptr_t)hal_remote_l64( XPTR( parent_cxy , &parent_ptr->fd_array.array[0] ) );
242
243	// get extended pointer on parent process TXT chdev
244	chdev_xp = chdev_from_file( file_xp );
245
246	// get cluster and local pointer on chdev
247	chdev_cxy = GET_CXY( chdev_xp );
248	chdev_ptr = GET_PTR( chdev_xp );
249
250	// get parent process TXT terminal index
251	txt_id = hal_remote_l32( XPTR( chdev_cxy , &chdev_ptr->channel ) );
252
253	// attach child process to parent process TXT terminal
254	process_txt_attach( process , txt_id );
255
256	// copy all open files from parent process fd_array to this process
257	process_fd_remote_copy( XPTR( local_cxy , &process->fd_array ),
258	XPTR( parent_cxy , &parent_ptr->fd_array ) );
259	}
260
261	// initialize lock protecting CWD changes
262	remote_busylock_init( XPTR( local_cxy , &process->cwd_lock ), LOCK_PROCESS_CWD );
263
264	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
265	cycle = (uint32_t)hal_get_cycles();
266	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
267	printk("\n[%s] thread[%x,%x] / set fd_array for process %x / cycle %d\n",
268	__FUNCTION__, parent_pid, this->trdid, pid , cycle );
269	#endif
270
271	// reset children list root
272	xlist_root_init( XPTR( local_cxy , &process->children_root ) );
273	process->children_nr = 0;
274	remote_queuelock_init( XPTR( local_cxy , &process->children_lock ), LOCK_PROCESS_CHILDREN );
275
276	// reset semaphore / mutex / barrier / condvar list roots and lock
277	xlist_root_init( XPTR( local_cxy , &process->sem_root ) );
278	xlist_root_init( XPTR( local_cxy , &process->mutex_root ) );
279	xlist_root_init( XPTR( local_cxy , &process->barrier_root ) );
280	xlist_root_init( XPTR( local_cxy , &process->condvar_root ) );
281	remote_queuelock_init( XPTR( local_cxy , &process->sync_lock ), LOCK_PROCESS_USERSYNC );
282
283	// reset open directories root and lock
284	xlist_root_init( XPTR( local_cxy , &process->dir_root ) );
285	remote_queuelock_init( XPTR( local_cxy , &process->dir_lock ), LOCK_PROCESS_DIR );
286
287	// register new process in the local cluster manager pref_tbl[]
288	lpid_t lpid = LPID_FROM_PID( pid );
289	LOCAL_CLUSTER->pmgr.pref_tbl[lpid] = XPTR( local_cxy , process );
290
291	// register new process descriptor in local cluster manager local_list
292	cluster_process_local_link( process );
293
294	// register new process descriptor in local cluster manager copies_list
295	cluster_process_copies_link( process );
296
297	// initialize th_tbl[] array and associated threads
298	uint32_t i;
299
300	for( i = 0 ; i < CONFIG_THREADS_MAX_PER_CLUSTER ; i++ )
301	{
302	process->th_tbl[i] = NULL;
303	}
304	process->th_nr = 0;
305	rwlock_init( &process->th_lock , LOCK_PROCESS_THTBL );
306
307	hal_fence();
308
309	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
310	cycle = (uint32_t)hal_get_cycles();
311	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
312	printk("\n[%s] thread[%x,%x] exit for process %x / cycle %d\n",
313	__FUNCTION__, parent_pid, this->trdid, pid, cycle );
314	#endif
315
316	} // process_reference_init()
317
318	/////////////////////////////////////////////////////
319	error_t process_copy_init( process_t * local_process,
320	xptr_t reference_process_xp )
321	{
322	error_t error;
323
324	// get reference process cluster and local pointer
325	cxy_t ref_cxy = GET_CXY( reference_process_xp );
326	process_t * ref_ptr = GET_PTR( reference_process_xp );
327
328	// initialize PID, REF_XP, PARENT_XP, and STATE
329	local_process->pid = hal_remote_l32( XPTR( ref_cxy , &ref_ptr->pid ) );
330	local_process->parent_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->parent_xp ) );
331	local_process->ref_xp = reference_process_xp;
332	local_process->owner_xp = reference_process_xp;
333	local_process->term_state = 0;
334
335	#if DEBUG_PROCESS_COPY_INIT
336	thread_t * this = CURRENT_THREAD;
337	uint32_t cycle = (uint32_t)hal_get_cycles();
338	if( DEBUG_PROCESS_COPY_INIT < cycle )
339	printk("\n[%s] thread[%x,%x] enter for process %x / cycle %d\n",
340	__FUNCTION__, this->process->pid, this->trdid, local_process->pid, cycle );
341	#endif
342
343	// check user process
344	assert( (local_process->pid != 0), "PID cannot be 0" );
345
346	// reset local process vmm
347	error = vmm_init( local_process );
348	assert( (error == 0) , "cannot initialize VMM\n");
349
350	// reset process file descriptors array
351	process_fd_init( local_process );
352
353	// reset vfs_root_xp / vfs_bin_xp / cwd_xp fields
354	local_process->vfs_root_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->vfs_root_xp ) );
355	local_process->vfs_bin_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->vfs_bin_xp ) );
356	local_process->cwd_xp = XPTR_NULL;
357
358	// reset children list root (not used in a process descriptor copy)
359	xlist_root_init( XPTR( local_cxy , &local_process->children_root ) );
360	local_process->children_nr = 0;
361	remote_queuelock_init( XPTR( local_cxy , &local_process->children_lock ),
362	LOCK_PROCESS_CHILDREN );
363
364	// reset children_list (not used in a process descriptor copy)
365	xlist_entry_init( XPTR( local_cxy , &local_process->children_list ) );
366
367	// reset semaphores list root (not used in a process descriptor copy)
368	xlist_root_init( XPTR( local_cxy , &local_process->sem_root ) );
369	xlist_root_init( XPTR( local_cxy , &local_process->mutex_root ) );
370	xlist_root_init( XPTR( local_cxy , &local_process->barrier_root ) );
371	xlist_root_init( XPTR( local_cxy , &local_process->condvar_root ) );
372
373	// initialize th_tbl[] array and associated fields
374	uint32_t i;
375	for( i = 0 ; i < CONFIG_THREADS_MAX_PER_CLUSTER ; i++ )
376	{
377	local_process->th_tbl[i] = NULL;
378	}
379	local_process->th_nr = 0;
380	rwlock_init( &local_process->th_lock , LOCK_PROCESS_THTBL );
381
382
383	// register new process descriptor in local cluster manager local_list
384	cluster_process_local_link( local_process );
385
386	// register new process descriptor in owner cluster manager copies_list
387	cluster_process_copies_link( local_process );
388
389	hal_fence();
390
391	#if DEBUG_PROCESS_COPY_INIT
392	cycle = (uint32_t)hal_get_cycles();
393	if( DEBUG_PROCESS_COPY_INIT < cycle )
394	printk("\n[%s] thread[%x,%x] exit for process %x / cycle %d\n",
395	__FUNCTION__, this->process->pid, this->trdid, local_process->pid, cycle );
396	#endif
397
398	return 0;
399
400	} // end process_copy_init()
401
402	///////////////////////////////////////////
403	void process_destroy( process_t * process )
404	{
405	xptr_t parent_xp;
406	process_t * parent_ptr;
407	cxy_t parent_cxy;
408	xptr_t children_lock_xp;
409	xptr_t children_nr_xp;
410
411	pid_t pid = process->pid;
412
413	// check no more threads
414	assert( (process->th_nr == 0) , "process %x in cluster %x contains threads", pid , local_cxy );
415
416	#if DEBUG_PROCESS_DESTROY
417	thread_t * this = CURRENT_THREAD;
418	uint32_t cycle = (uint32_t)hal_get_cycles();
419	if( DEBUG_PROCESS_DESTROY < cycle )
420	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
421	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy, cycle );
422	#endif
423
424	// remove process from local_list in local cluster manager
425	cluster_process_local_unlink( process );
426
427	// remove process from copies_list in owner cluster manager
428	cluster_process_copies_unlink( process );
429
430	// remove process from children_list
431	// and release PID if owner cluster
432	if( CXY_FROM_PID( pid ) == local_cxy )
433	{
434	// get pointers on parent process
435	parent_xp = process->parent_xp;
436	parent_cxy = GET_CXY( parent_xp );
437	parent_ptr = GET_PTR( parent_xp );
438
439	// get extended pointer on children_lock in parent process
440	children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock );
441	children_nr_xp = XPTR( parent_cxy , &parent_ptr->children_nr );
442
443	// remove process from children_list
444	remote_queuelock_acquire( children_lock_xp );
445	xlist_unlink( XPTR( local_cxy , &process->children_list ) );
446	hal_remote_atomic_add( children_nr_xp , -1 );
447	remote_queuelock_release( children_lock_xp );
448
449	// release the process PID to cluster manager
450	cluster_pid_release( pid );
451	}
452
453	// FIXME close all open files and synchronize dirty [AG]
454
455	// decrease refcount for bin file, root file and cwd file
456	if( process->vfs_bin_xp != XPTR_NULL ) vfs_file_count_down( process->vfs_bin_xp );
457	if( process->vfs_root_xp != XPTR_NULL ) vfs_file_count_down( process->vfs_root_xp );
458	if( process->cwd_xp != XPTR_NULL ) vfs_file_count_down( process->cwd_xp );
459
460	// Destroy VMM
461	vmm_destroy( process );
462
463	// release memory allocated to process descriptor
464	process_free( process );
465
466	#if DEBUG_PROCESS_DESTROY
467	cycle = (uint32_t)hal_get_cycles();
468	if( DEBUG_PROCESS_DESTROY < cycle )
469	printk("\n[%s] thread[%x,%x] exit / process %x in cluster %x / cycle %d\n",
470	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy, cycle );
471	#endif
472
473	} // end process_destroy()
474
475	///////////////////////////////////////////////////////////////////
476	const char * process_action_str( process_sigactions_t action_type )
477	{
478	switch ( action_type )
479	{
480	case BLOCK_ALL_THREADS: return "BLOCK";
481	case UNBLOCK_ALL_THREADS: return "UNBLOCK";
482	case DELETE_ALL_THREADS: return "DELETE";
483	default: return "undefined";
484	}
485	}
486
487	////////////////////////////////////////
488	void process_sigaction( pid_t pid,
489	uint32_t type )
490	{
491	cxy_t owner_cxy; // owner cluster identifier
492	lpid_t lpid; // process index in owner cluster
493	cluster_t * cluster; // pointer on cluster manager
494	xptr_t root_xp; // extended pointer on root of copies
495	xptr_t lock_xp; // extended pointer on lock protecting copies
496	xptr_t iter_xp; // iterator on copies list
497	xptr_t process_xp; // extended pointer on process copy
498	cxy_t process_cxy; // process copy cluster identifier
499	process_t * process_ptr; // local pointer on process copy
500	reg_t save_sr; // for critical section
501	rpc_desc_t rpc; // shared RPC descriptor
502	thread_t * client; // pointer on client thread
503	xptr_t client_xp; // extended pointer on client thread
504	process_t * local; // pointer on process copy in local cluster
505	uint32_t remote_nr; // number of remote process copies
506
507	client = CURRENT_THREAD;
508	client_xp = XPTR( local_cxy , client );
509	local = NULL;
510	remote_nr = 0;
511
512	// check calling thread can yield
513	thread_assert_can_yield( client , __FUNCTION__ );
514
515	#if DEBUG_PROCESS_SIGACTION
516	uint32_t cycle = (uint32_t)hal_get_cycles();
517	if( DEBUG_PROCESS_SIGACTION < cycle )
518	printk("\n[%s] thread[%x,%x] enter to %s process %x / cycle %d\n",
519	__FUNCTION__ , client->process->pid, client->trdid,
520	process_action_str( type ) , pid , cycle );
521	#endif
522
523	// get pointer on local cluster manager
524	cluster = LOCAL_CLUSTER;
525
526	// get owner cluster identifier and process lpid
527	owner_cxy = CXY_FROM_PID( pid );
528	lpid = LPID_FROM_PID( pid );
529
530	// get root of list of copies and lock from owner cluster
531	root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
532	lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
533
534	// check action type
535	assert( ((type == DELETE_ALL_THREADS ) \|\|
536	(type == BLOCK_ALL_THREADS ) \|\|
537	(type == UNBLOCK_ALL_THREADS )), "illegal action type" );
538
539	// This client thread send parallel RPCs to all remote clusters containing
540	// target process copies, wait all responses, and then handles directly
541	// the threads in local cluster, when required.
542	// The client thread allocates a - shared - RPC descriptor in the stack,
543	// because all parallel, non-blocking, server threads use the same input
544	// arguments, and use the shared RPC response field
545
546	// mask IRQs
547	hal_disable_irq( &save_sr);
548
549	// client thread blocks itself
550	thread_block( client_xp , THREAD_BLOCKED_RPC );
551
552	// initialize shared RPC descriptor
553	rpc.responses = 0;
554	rpc.blocking = false;
555	rpc.index = RPC_PROCESS_SIGACTION;
556	rpc.thread = client;
557	rpc.lid = client->core->lid;
558	rpc.args[0] = pid;
559	rpc.args[1] = type;
560
561	// take the lock protecting process copies
562	remote_queuelock_acquire( lock_xp );
563
564	// scan list of process copies
565	XLIST_FOREACH( root_xp , iter_xp )
566	{
567	// get extended pointers and cluster on process
568	process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list );
569	process_cxy = GET_CXY( process_xp );
570	process_ptr = GET_PTR( process_xp );
571
572	if( process_cxy == local_cxy ) // process copy is local
573	{
574	local = process_ptr;
575	}
576	else // process copy is remote
577	{
578	// update number of remote process copies
579	remote_nr++;
580
581	// atomically increment responses counter
582	hal_atomic_add( (void *)&rpc.responses , 1 );
583
584	#if DEBUG_PROCESS_SIGACTION
585	if( DEBUG_PROCESS_SIGACTION < cycle )
586	printk("\n[%s] thread[%x,%x] send RPC to cluster %x for process %x\n",
587	__FUNCTION__, client->process->pid, client->trdid, process_cxy, pid );
588	#endif
589	// call RPC in target cluster
590	rpc_process_sigaction_client( process_cxy , &rpc );
591	}
592	} // end list of copies
593
594	// release the lock protecting process copies
595	remote_queuelock_release( lock_xp );
596
597	// restore IRQs
598	hal_restore_irq( save_sr);
599
600	// - if there is remote process copies, the client thread deschedules,
601	// (it will be unblocked by the last RPC server thread).
602	// - if there is no remote copies, the client thread unblock itself.
603	if( remote_nr )
604	{
605	sched_yield("blocked on rpc_process_sigaction");
606	}
607	else
608	{
609	thread_unblock( client_xp , THREAD_BLOCKED_RPC );
610	}
611
612	// handle the local process copy if required
613	if( local != NULL )
614	{
615
616	#if DEBUG_PROCESS_SIGACTION
617	if( DEBUG_PROCESS_SIGACTION < cycle )
618	printk("\n[%s] thread[%x,%x] handles local process %x in cluster %x\n",
619	__FUNCTION__, client->process->pid, client->trdid, pid , local_cxy );
620	#endif
621	if (type == DELETE_ALL_THREADS ) process_delete_threads ( local , client_xp );
622	else if(type == BLOCK_ALL_THREADS ) process_block_threads ( local );
623	else if(type == UNBLOCK_ALL_THREADS ) process_unblock_threads( local );
624	}
625
626	#if DEBUG_PROCESS_SIGACTION
627	cycle = (uint32_t)hal_get_cycles();
628	if( DEBUG_PROCESS_SIGACTION < cycle )
629	printk("\n[%s] thread[%x,%x] exit after %s process %x / cycle %d\n",
630	__FUNCTION__, client->process->pid, client->trdid,
631	process_action_str( type ), pid, cycle );
632	#endif
633
634	} // end process_sigaction()
635
636	/////////////////////////////////////////////////
637	void process_block_threads( process_t * process )
638	{
639	thread_t * target; // pointer on target thread
640	thread_t * this; // pointer on calling thread
641	uint32_t ltid; // index in process th_tbl[]
642	cxy_t owner_cxy; // target process owner cluster
643	uint32_t count; // requests counter
644	volatile uint32_t ack_count; // acknowledges counter
645
646	// get calling thread pointer
647	this = CURRENT_THREAD;
648
649	#if DEBUG_PROCESS_SIGACTION
650	pid_t pid = process->pid;
651	uint32_t cycle = (uint32_t)hal_get_cycles();
652	if( DEBUG_PROCESS_SIGACTION < cycle )
653	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
654	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy , cycle );
655	#endif
656
657	// check target process is an user process
658	assert( (LPID_FROM_PID( process->pid ) != 0 ), "target process must be an user process" );
659
660	// get target process owner cluster
661	owner_cxy = CXY_FROM_PID( process->pid );
662
663	// get lock protecting process th_tbl[]
664	rwlock_rd_acquire( &process->th_lock );
665
666	// loop on target process local threads
667	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
668	// - if the calling thread and the target thread are not running on the same
669	// core, we ask the target scheduler to acknowlege the blocking
670	// to be sure that the target thread is not running.
671	// - if the calling thread and the target thread are running on the same core,
672	// we don't need confirmation from scheduler.
673
674	for( ltid = 0 , count = 0 , ack_count = 0 ; count < process->th_nr ; ltid++ )
675	{
676	target = process->th_tbl[ltid];
677
678	if( target != NULL ) // thread exist
679	{
680	count++;
681
682	// set the global blocked bit in target thread descriptor.
683	thread_block( XPTR( local_cxy , target ) , THREAD_BLOCKED_GLOBAL );
684
685	if( this->core->lid != target->core->lid )
686	{
687	// increment responses counter
688	hal_atomic_add( (void*)&ack_count , 1 );
689
690	// set FLAG_REQ_ACK and &ack_rsp_count in target descriptor
691	thread_set_req_ack( target , (uint32_t *)&ack_count );
692
693	// force scheduling on target thread
694	dev_pic_send_ipi( local_cxy , target->core->lid );
695	}
696	}
697	}
698
699	// release lock protecting process th_tbl[]
700	rwlock_rd_release( &process->th_lock );
701
702	// wait other threads acknowledges TODO this could be improved...
703	while( 1 )
704	{
705	// exit when all scheduler acknowledges received
706	if ( ack_count == 0 ) break;
707
708	// wait 1000 cycles before retry
709	hal_fixed_delay( 1000 );
710	}
711
712	#if DEBUG_PROCESS_SIGACTION
713	cycle = (uint32_t)hal_get_cycles();
714	if( DEBUG_PROCESS_SIGACTION < cycle )
715	printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
716	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy , cycle );
717	#endif
718
719	} // end process_block_threads()
720
721	/////////////////////////////////////////////////
722	void process_delete_threads( process_t * process,
723	xptr_t client_xp )
724	{
725	thread_t * this; // pointer on calling thread
726	thread_t * target; // local pointer on target thread
727	xptr_t target_xp; // extended pointer on target thread
728	cxy_t owner_cxy; // owner process cluster
729	uint32_t ltid; // index in process th_tbl
730	uint32_t count; // threads counter
731
732	// get calling thread pointer
733	this = CURRENT_THREAD;
734
735	// get target process owner cluster
736	owner_cxy = CXY_FROM_PID( process->pid );
737
738	#if DEBUG_PROCESS_SIGACTION
739	uint32_t cycle = (uint32_t)hal_get_cycles();
740	if( DEBUG_PROCESS_SIGACTION < cycle )
741	printk("\n[%s] thread[%x,%x] enter in cluster %x for process %x / cycle %d\n",
742	__FUNCTION__, this->process->pid, this->trdid, local_cxy, process->pid, cycle );
743	#endif
744
745	// check target process is an user process
746	assert( (LPID_FROM_PID( process->pid ) != 0), "process %x not an user process", process->pid );
747
748	// get lock protecting process th_tbl[]
749	rwlock_wr_acquire( &process->th_lock );
750
751	// loop on target process local threads
752	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
753	for( ltid = 0 , count = 0 ; count < process->th_nr ; ltid++ )
754	{
755	target = process->th_tbl[ltid];
756
757	if( target != NULL ) // valid thread
758	{
759	count++;
760	target_xp = XPTR( local_cxy , target );
761
762	// main thread and client thread should not be deleted
763	if( ((ltid != 0) \|\| (owner_cxy != local_cxy)) && // not main thread
764	(client_xp) != target_xp ) // not client thread
765	{
766	// mark target thread for delete and block it
767	thread_delete( target_xp , process->pid , false ); // not forced
768	}
769	}
770	}
771
772	// release lock protecting process th_tbl[]
773	rwlock_wr_release( &process->th_lock );
774
775	#if DEBUG_PROCESS_SIGACTION
776	cycle = (uint32_t)hal_get_cycles();
777	if( DEBUG_PROCESS_SIGACTION < cycle )
778	printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
779	__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy , cycle );
780	#endif
781
782	} // end process_delete_threads()
783
784	///////////////////////////////////////////////////
785	void process_unblock_threads( process_t * process )
786	{
787	thread_t * target; // pointer on target thead
788	thread_t * this; // pointer on calling thread
789	uint32_t ltid; // index in process th_tbl
790	uint32_t count; // requests counter
791
792	// get calling thread pointer
793	this = CURRENT_THREAD;
794
795	#if DEBUG_PROCESS_SIGACTION
796	pid_t pid = process->pid;
797	uint32_t cycle = (uint32_t)hal_get_cycles();
798	if( DEBUG_PROCESS_SIGACTION < cycle )
799	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
800	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy , cycle );
801	#endif
802
803	// check target process is an user process
804	assert( ( process->pid != 0 ),
805	"target process must be an user process" );
806
807	// get lock protecting process th_tbl[]
808	rwlock_rd_acquire( &process->th_lock );
809
810	// loop on process threads to unblock all threads
811	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
812	for( ltid = 0 , count = 0 ; count < process->th_nr ; ltid++ )
813	{
814	target = process->th_tbl[ltid];
815
816	if( target != NULL ) // thread found
817	{
818	count++;
819
820	// reset the global blocked bit in target thread descriptor.
821	thread_unblock( XPTR( local_cxy , target ) , THREAD_BLOCKED_GLOBAL );
822	}
823	}
824
825	// release lock protecting process th_tbl[]
826	rwlock_rd_release( &process->th_lock );
827
828	#if DEBUG_PROCESS_SIGACTION
829	cycle = (uint32_t)hal_get_cycles();
830	if( DEBUG_PROCESS_SIGACTION < cycle )
831	printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
832	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy, cycle );
833	#endif
834
835	} // end process_unblock_threads()
836
837	///////////////////////////////////////////////
838	process_t * process_get_local_copy( pid_t pid )
839	{
840	error_t error;
841	process_t * process_ptr; // local pointer on process
842	xptr_t process_xp; // extended pointer on process
843
844	cluster_t * cluster = LOCAL_CLUSTER;
845
846	#if DEBUG_PROCESS_GET_LOCAL_COPY
847	thread_t * this = CURRENT_THREAD;
848	uint32_t cycle = (uint32_t)hal_get_cycles();
849	if( DEBUG_PROCESS_GET_LOCAL_COPY < cycle )
850	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
851	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy, cycle );
852	#endif
853
854	// get lock protecting local list of processes
855	remote_queuelock_acquire( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
856
857	// scan the local list of process descriptors to find the process
858	xptr_t iter;
859	bool_t found = false;
860	XLIST_FOREACH( XPTR( local_cxy , &cluster->pmgr.local_root ) , iter )
861	{
862	process_xp = XLIST_ELEMENT( iter , process_t , local_list );
863	process_ptr = GET_PTR( process_xp );
864	if( process_ptr->pid == pid )
865	{
866	found = true;
867	break;
868	}
869	}
870
871	// release lock protecting local list of processes
872	remote_queuelock_release( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
873
874	// allocate memory for a new local process descriptor
875	// and initialise it from reference cluster if not found
876	if( !found )
877	{
878	// get extended pointer on reference process descriptor
879	xptr_t ref_xp = cluster_get_reference_process_from_pid( pid );
880
881	assert( (ref_xp != XPTR_NULL) , "illegal pid\n" );
882
883	// allocate memory for local process descriptor
884	process_ptr = process_alloc();
885
886	if( process_ptr == NULL ) return NULL;
887
888	// initialize local process descriptor copy
889	error = process_copy_init( process_ptr , ref_xp );
890
891	if( error ) return NULL;
892	}
893
894	#if DEBUG_PROCESS_GET_LOCAL_COPY
895	cycle = (uint32_t)hal_get_cycles();
896	if( DEBUG_PROCESS_GET_LOCAL_COPY < cycle )
897	printk("\n[%s] thread[%x,%x] exit in cluster %x / process %x / cycle %d\n",
898	__FUNCTION__, this->process->pid, this->trdid, local_cxy, process_ptr, cycle );
899	#endif
900
901	return process_ptr;
902
903	} // end process_get_local_copy()
904
905	////////////////////////////////////////////
906	pid_t process_get_ppid( xptr_t process_xp )
907	{
908	cxy_t process_cxy;
909	process_t * process_ptr;
910	xptr_t parent_xp;
911	cxy_t parent_cxy;
912	process_t * parent_ptr;
913
914	// get process cluster and local pointer
915	process_cxy = GET_CXY( process_xp );
916	process_ptr = GET_PTR( process_xp );
917
918	// get pointers on parent process
919	parent_xp = (xptr_t)hal_remote_l64( XPTR( process_cxy , &process_ptr->parent_xp ) );
920	parent_cxy = GET_CXY( parent_xp );
921	parent_ptr = GET_PTR( parent_xp );
922
923	return hal_remote_l32( XPTR( parent_cxy , &parent_ptr->pid ) );
924	}
925
926	//////////////////////////////////////////////////////////////////////////////////////////
927	// File descriptor array related functions
928	//////////////////////////////////////////////////////////////////////////////////////////
929
930	///////////////////////////////////////////
931	void process_fd_init( process_t * process )
932	{
933	uint32_t fd;
934
935	// initialize lock
936	remote_queuelock_init( XPTR( local_cxy , &process->fd_array.lock ), LOCK_PROCESS_FDARRAY );
937
938	// initialize number of open files
939	process->fd_array.current = 0;
940
941	// initialize array
942	for ( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
943	{
944	process->fd_array.array[fd] = XPTR_NULL;
945	}
946	}
947	////////////////////////////////////////////////////
948	error_t process_fd_register( xptr_t process_xp,
949	xptr_t file_xp,
950	uint32_t * fdid )
951	{
952	bool_t found;
953	uint32_t id;
954	xptr_t xp;
955
956	// get reference process cluster and local pointer
957	process_t * process_ptr = GET_PTR( process_xp );
958	cxy_t process_cxy = GET_CXY( process_xp );
959
960	// check client process is reference process
961	assert( (process_xp == hal_remote_l64( XPTR( process_cxy , &process_ptr->ref_xp ) ) ),
962	"client process must be reference process\n" );
963
964	#if DEBUG_PROCESS_FD_REGISTER
965	thread_t * this = CURRENT_THREAD;
966	uint32_t cycle = (uint32_t)hal_get_cycles();
967	pid_t pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid) );
968	if( DEBUG_PROCESS_FD_REGISTER < cycle )
969	printk("\n[%s] thread[%x,%x] enter for process %x / cycle %d\n",
970	__FUNCTION__, this->process->pid, this->trdid, pid, cycle );
971	#endif
972
973	// build extended pointer on lock protecting reference fd_array
974	xptr_t lock_xp = XPTR( process_cxy , &process_ptr->fd_array.lock );
975
976	// take lock protecting reference fd_array
977	remote_queuelock_acquire( lock_xp );
978
979	found = false;
980
981	for ( id = 0; id < CONFIG_PROCESS_FILE_MAX_NR ; id++ )
982	{
983	xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->fd_array.array[id] ) );
984	if ( xp == XPTR_NULL )
985	{
986	// update reference fd_array
987	hal_remote_s64( XPTR( process_cxy , &process_ptr->fd_array.array[id] ) , file_xp );
988	hal_remote_atomic_add( XPTR( process_cxy , &process_ptr->fd_array.current ) , 1 );
989
990	// exit
991	*fdid = id;
992	found = true;
993	break;
994	}
995	}
996
997	// release lock protecting fd_array
998	remote_queuelock_release( lock_xp );
999
1000	#if DEBUG_PROCESS_FD_REGISTER
1001	cycle = (uint32_t)hal_get_cycles();
1002	if( DEBUG_PROCESS_FD_REGISTER < cycle )
1003	printk("\n[%s] thread[%x,%x] exit for process %x / fdid %d / cycle %d\n",
1004	__FUNCTION__, this->process->pid, this->trdid, pid, id, cycle );
1005	#endif
1006
1007	if ( !found ) return -1;
1008	else return 0;
1009
1010	} // end process_fd_register()
1011
1012	////////////////////////////////////////////////
1013	xptr_t process_fd_get_xptr( process_t * process,
1014	uint32_t fdid )
1015	{
1016	xptr_t file_xp;
1017	xptr_t lock_xp;
1018
1019	// access local copy of process descriptor
1020	file_xp = process->fd_array.array[fdid];
1021
1022	if( file_xp == XPTR_NULL )
1023	{
1024	// get reference process cluster and local pointer
1025	xptr_t ref_xp = process->ref_xp;
1026	cxy_t ref_cxy = GET_CXY( ref_xp );
1027	process_t * ref_ptr = GET_PTR( ref_xp );
1028
1029	// build extended pointer on lock protecting reference fd_array
1030	lock_xp = XPTR( ref_cxy , &ref_ptr->fd_array.lock );
1031
1032	// take lock protecting reference fd_array
1033	remote_queuelock_acquire( lock_xp );
1034
1035	// access reference process descriptor
1036	file_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->fd_array.array[fdid] ) );
1037
1038	// update local fd_array if found
1039	if( file_xp != XPTR_NULL ) process->fd_array.array[fdid] = file_xp;
1040
1041	// release lock protecting reference fd_array
1042	remote_queuelock_release( lock_xp );
1043	}
1044
1045	return file_xp;
1046
1047	} // end process_fd_get_xptr()
1048
1049	///////////////////////////////////////////
1050	void process_fd_remote_copy( xptr_t dst_xp,
1051	xptr_t src_xp )
1052	{
1053	uint32_t fd;
1054	xptr_t entry;
1055
1056	// get cluster and local pointer for src fd_array
1057	cxy_t src_cxy = GET_CXY( src_xp );
1058	fd_array_t * src_ptr = GET_PTR( src_xp );
1059
1060	// get cluster and local pointer for dst fd_array
1061	cxy_t dst_cxy = GET_CXY( dst_xp );
1062	fd_array_t * dst_ptr = GET_PTR( dst_xp );
1063
1064	// get the remote lock protecting the src fd_array
1065	remote_queuelock_acquire( XPTR( src_cxy , &src_ptr->lock ) );
1066
1067	// loop on all fd_array entries
1068	for( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
1069	{
1070	entry = (xptr_t)hal_remote_l64( XPTR( src_cxy , &src_ptr->array[fd] ) );
1071
1072	if( entry != XPTR_NULL )
1073	{
1074	// increment file descriptor refcount
1075	vfs_file_count_up( entry );
1076
1077	// copy entry in destination process fd_array
1078	hal_remote_s64( XPTR( dst_cxy , &dst_ptr->array[fd] ) , entry );
1079	}
1080	}
1081
1082	// release lock on source process fd_array
1083	remote_queuelock_release( XPTR( src_cxy , &src_ptr->lock ) );
1084
1085	} // end process_fd_remote_copy()
1086
1087
1088	////////////////////////////////////
1089	bool_t process_fd_array_full( void )
1090	{
1091	// get extended pointer on reference process
1092	xptr_t ref_xp = CURRENT_THREAD->process->ref_xp;
1093
1094	// get reference process cluster and local pointer
1095	process_t * ref_ptr = GET_PTR( ref_xp );
1096	cxy_t ref_cxy = GET_CXY( ref_xp );
1097
1098	// get number of open file descriptors from reference fd_array
1099	uint32_t current = hal_remote_l32( XPTR( ref_cxy , &ref_ptr->fd_array.current ) );
1100
1101	return ( current >= CONFIG_PROCESS_FILE_MAX_NR );
1102	}
1103
1104
1105	////////////////////////////////////////////////////////////////////////////////////
1106	// Thread related functions
1107	////////////////////////////////////////////////////////////////////////////////////
1108
1109	/////////////////////////////////////////////////////
1110	error_t process_register_thread( process_t * process,
1111	thread_t * thread,
1112	trdid_t * trdid )
1113	{
1114	ltid_t ltid;
1115	bool_t found = false;
1116
1117	// check arguments
1118	assert( (process != NULL) , "process argument is NULL" );
1119	assert( (thread != NULL) , "thread argument is NULL" );
1120
1121	// get the lock protecting th_tbl for all threads
1122	// but the idle thread executing kernel_init (cannot yield)
1123	if( thread->type != THREAD_IDLE ) rwlock_wr_acquire( &process->th_lock );
1124
1125	// scan th_tbl
1126	for( ltid = 0 ; ltid < CONFIG_THREADS_MAX_PER_CLUSTER ; ltid++ )
1127	{
1128	if( process->th_tbl[ltid] == NULL )
1129	{
1130	found = true;
1131	break;
1132	}
1133	}
1134
1135	if( found )
1136	{
1137	// register thread in th_tbl[]
1138	process->th_tbl[ltid] = thread;
1139	process->th_nr++;
1140
1141	// returns trdid
1142	*trdid = TRDID( local_cxy , ltid );
1143	}
1144
1145	// release the lock protecting th_tbl
1146	if( thread->type != THREAD_IDLE ) rwlock_wr_release( &process->th_lock );
1147
1148	return (found) ? 0 : 0xFFFFFFFF;
1149
1150	} // end process_register_thread()
1151
1152	/////////////////////////////////////////////////
1153	bool_t process_remove_thread( thread_t * thread )
1154	{
1155	uint32_t count; // number of threads in local process descriptor
1156
1157	process_t * process = thread->process;
1158
1159	// get thread local index
1160	ltid_t ltid = LTID_FROM_TRDID( thread->trdid );
1161
1162	// get the lock protecting th_tbl[]
1163	rwlock_wr_acquire( &process->th_lock );
1164
1165	// get number of threads
1166	count = process->th_nr;
1167
1168	// check thread
1169	assert( (thread != NULL) , "thread argument is NULL" );
1170
1171	// check th_nr value
1172	assert( (count > 0) , "process th_nr cannot be 0\n" );
1173
1174	// remove thread from th_tbl[]
1175	process->th_tbl[ltid] = NULL;
1176	process->th_nr = count-1;
1177
1178	// release lock protecting th_tbl
1179	rwlock_wr_release( &process->th_lock );
1180
1181	return (count == 1);
1182
1183	} // end process_remove_thread()
1184
1185	/////////////////////////////////////////////////////////
1186	error_t process_make_fork( xptr_t parent_process_xp,
1187	xptr_t parent_thread_xp,
1188	pid_t * child_pid,
1189	thread_t ** child_thread )
1190	{
1191	process_t * process; // local pointer on child process descriptor
1192	thread_t * thread; // local pointer on child thread descriptor
1193	pid_t new_pid; // process identifier for child process
1194	pid_t parent_pid; // process identifier for parent process
1195	xptr_t ref_xp; // extended pointer on reference process
1196	xptr_t vfs_bin_xp; // extended pointer on .elf file
1197	error_t error;
1198
1199	// get cluster and local pointer for parent process
1200	cxy_t parent_process_cxy = GET_CXY( parent_process_xp );
1201	process_t * parent_process_ptr = GET_PTR( parent_process_xp );
1202
1203	// get parent process PID and extended pointer on .elf file
1204	parent_pid = hal_remote_l32 (XPTR( parent_process_cxy , &parent_process_ptr->pid));
1205	vfs_bin_xp = hal_remote_l64(XPTR( parent_process_cxy , &parent_process_ptr->vfs_bin_xp));
1206
1207	// get extended pointer on reference process
1208	ref_xp = hal_remote_l64( XPTR( parent_process_cxy , &parent_process_ptr->ref_xp ) );
1209
1210	// check parent process is the reference process
1211	assert( (parent_process_xp == ref_xp ) ,
1212	"parent process must be the reference process\n" );
1213
1214	#if DEBUG_PROCESS_MAKE_FORK
1215	uint32_t cycle = (uint32_t)hal_get_cycles();
1216	thread_t * this = CURRENT_THREAD;
1217	trdid_t trdid = this->trdid;
1218	pid_t pid = this->process->pid;
1219	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1220	printk("\n[%s] thread[%x,%x] enter / cluster %x / cycle %d\n",
1221	__FUNCTION__, pid, trdid, local_cxy, cycle );
1222	#endif
1223
1224	// allocate a process descriptor
1225	process = process_alloc();
1226	if( process == NULL )
1227	{
1228	printk("\n[ERROR] in %s : cannot get process in cluster %x\n",
1229	__FUNCTION__, local_cxy );
1230	return -1;
1231	}
1232
1233	// allocate a child PID from local cluster
1234	error = cluster_pid_alloc( process , &new_pid );
1235	if( error )
1236	{
1237	printk("\n[ERROR] in %s : cannot get PID in cluster %x\n",
1238	__FUNCTION__, local_cxy );
1239	process_free( process );
1240	return -1;
1241	}
1242
1243	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1244	cycle = (uint32_t)hal_get_cycles();
1245	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1246	printk("\n[%s] thread[%x,%x] allocated process %x / cycle %d\n",
1247	__FUNCTION__, pid, trdid, new_pid, cycle );
1248	#endif
1249
1250	// initializes child process descriptor from parent process descriptor
1251	process_reference_init( process,
1252	new_pid,
1253	parent_process_xp );
1254
1255	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1256	cycle = (uint32_t)hal_get_cycles();
1257	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1258	printk("\n[%s] thread[%x,%x] initialized child_process %x / cycle %d\n",
1259	__FUNCTION__, pid, trdid, new_pid, cycle );
1260	#endif
1261
1262
1263	// copy VMM from parent descriptor to child descriptor
1264	error = vmm_fork_copy( process,
1265	parent_process_xp );
1266	if( error )
1267	{
1268	printk("\n[ERROR] in %s : cannot copy VMM in cluster %x\n",
1269	__FUNCTION__, local_cxy );
1270	process_free( process );
1271	cluster_pid_release( new_pid );
1272	return -1;
1273	}
1274
1275	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1276	cycle = (uint32_t)hal_get_cycles();
1277	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1278	printk("\n[%s] thread[%x,%x] copied VMM from parent to child / cycle %d\n",
1279	__FUNCTION__, pid, trdid, cycle );
1280	#endif
1281
1282	// if parent_process is INIT, or if parent_process is the TXT owner,
1283	// the child_process becomes the owner of its TXT terminal
1284	if( (parent_pid == 1) \|\| process_txt_is_owner( parent_process_xp ) )
1285	{
1286	process_txt_set_ownership( XPTR( local_cxy , process ) );
1287
1288	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1289	cycle = (uint32_t)hal_get_cycles();
1290	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1291	printk("\n[%s] thread[%x,%x] / child takes TXT ownership / cycle %d\n",
1292	__FUNCTION__ , pid, trdid, cycle );
1293	#endif
1294
1295	}
1296
1297	// update extended pointer on .elf file
1298	process->vfs_bin_xp = vfs_bin_xp;
1299
1300	// create child thread descriptor from parent thread descriptor
1301	error = thread_user_fork( parent_thread_xp,
1302	process,
1303	&thread );
1304	if( error )
1305	{
1306	printk("\n[ERROR] in %s : cannot create thread in cluster %x\n",
1307	__FUNCTION__, local_cxy );
1308	process_free( process );
1309	cluster_pid_release( new_pid );
1310	return -1;
1311	}
1312
1313	// check main thread LTID
1314	assert( (LTID_FROM_TRDID(thread->trdid) == 0) ,
1315	"main thread must have LTID == 0\n" );
1316
1317	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1318	cycle = (uint32_t)hal_get_cycles();
1319	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1320	printk("\n[%s] thread[%x,%x] created main thread %x / cycle %d\n",
1321	__FUNCTION__, pid, trdid, thread, cycle );
1322	#endif
1323
1324	// set Copy_On_Write flag in parent process GPT
1325	// this includes all replicated GPT copies
1326	if( parent_process_cxy == local_cxy ) // reference is local
1327	{
1328	vmm_set_cow( parent_process_ptr );
1329	}
1330	else // reference is remote
1331	{
1332	rpc_vmm_set_cow_client( parent_process_cxy,
1333	parent_process_ptr );
1334	}
1335
1336	// set Copy_On_Write flag in child process GPT
1337	vmm_set_cow( process );
1338
1339	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1340	cycle = (uint32_t)hal_get_cycles();
1341	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1342	printk("\n[%s] thread[%x,%x] set COW in parent and child / cycle %d\n",
1343	__FUNCTION__, pid, trdid, cycle );
1344	#endif
1345
1346	// get extended pointers on parent children_root, children_lock and children_nr
1347	xptr_t children_root_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_root );
1348	xptr_t children_lock_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_lock );
1349	xptr_t children_nr_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_nr );
1350
1351	// register process in parent children list
1352	remote_queuelock_acquire( children_lock_xp );
1353	xlist_add_last( children_root_xp , XPTR( local_cxy , &process->children_list ) );
1354	hal_remote_atomic_add( children_nr_xp , 1 );
1355	remote_queuelock_release( children_lock_xp );
1356
1357	// return success
1358	*child_thread = thread;
1359	*child_pid = new_pid;
1360
1361	#if DEBUG_PROCESS_MAKE_FORK
1362	cycle = (uint32_t)hal_get_cycles();
1363	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1364	printk("\n[%s] thread[%x,%x] exit / created process %x / cycle %d\n",
1365	__FUNCTION__, pid, trdid, new_pid, cycle );
1366	#endif
1367
1368	return 0;
1369
1370	} // end process_make_fork()
1371
1372	/////////////////////////////////////////////////////
1373	error_t process_make_exec( exec_info_t * exec_info )
1374	{
1375	thread_t * thread; // local pointer on this thread
1376	process_t * process; // local pointer on this process
1377	pid_t pid; // this process identifier
1378	xptr_t ref_xp; // reference process for this process
1379	error_t error; // value returned by called functions
1380	char * path; // path to .elf file
1381	xptr_t file_xp; // extended pointer on .elf file descriptor
1382	uint32_t file_id; // file index in fd_array
1383	uint32_t args_nr; // number of main thread arguments
1384	char ** args_pointers; // array of pointers on main thread arguments
1385
1386	// get thread, process, pid and ref_xp
1387	thread = CURRENT_THREAD;
1388	process = thread->process;
1389	pid = process->pid;
1390	ref_xp = process->ref_xp;
1391
1392	// get relevant infos from exec_info
1393	path = exec_info->path;
1394	args_nr = exec_info->args_nr;
1395	args_pointers = exec_info->args_pointers;
1396
1397	#if DEBUG_PROCESS_MAKE_EXEC
1398	uint32_t cycle = (uint32_t)hal_get_cycles();
1399	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1400	printk("\n[%s] thread[%x,%x] enters for %s / cycle %d\n",
1401	__FUNCTION__, pid, thread->trdid, path, cycle );
1402	#endif
1403
1404	// open the file identified by <path>
1405	file_xp = XPTR_NULL;
1406	file_id = 0xFFFFFFFF;
1407	error = vfs_open( process->vfs_root_xp,
1408	path,
1409	ref_xp,
1410	O_RDONLY,
1411	0,
1412	&file_xp,
1413	&file_id );
1414	if( error )
1415	{
1416	printk("\n[ERROR] in %s : failed to open file <%s>\n", __FUNCTION__ , path );
1417	return -1;
1418	}
1419
1420	#if (DEBUG_PROCESS_MAKE_EXEC & 1)
1421	cycle = (uint32_t)hal_get_cycles();
1422	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1423	printk("\n[%s] thread[%x,%x] opened file <%s> / cycle %d\n",
1424	__FUNCTION__, pid, thread->trdid, path, cycle );
1425	#endif
1426
1427	// delete all threads other than this main thread in all clusters
1428	process_sigaction( pid , DELETE_ALL_THREADS );
1429
1430	#if (DEBUG_PROCESS_MAKE_EXEC & 1)
1431	cycle = (uint32_t)hal_get_cycles();
1432	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1433	printk("\n[%s] thread[%x,%x] deleted all threads / cycle %d\n",
1434	__FUNCTION__, pid, thread->trdid, cycle );
1435	#endif
1436
1437	// reset local process VMM
1438	vmm_destroy( process );
1439
1440	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1441	cycle = (uint32_t)hal_get_cycles();
1442	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1443	printk("\n[%s] thread[%x,%x] reset VMM / cycle %d\n",
1444	__FUNCTION__, pid, thread->trdid, cycle );
1445	#endif
1446
1447	// re-initialize the VMM (kentry/args/envs vsegs registration)
1448	error = vmm_init( process );
1449	if( error )
1450	{
1451	printk("\n[ERROR] in %s : cannot initialise VMM for %s\n", __FUNCTION__ , path );
1452	vfs_close( file_xp , file_id );
1453	// FIXME restore old process VMM
1454	return -1;
1455	}
1456
1457	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1458	cycle = (uint32_t)hal_get_cycles();
1459	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1460	printk("\n[%s] thread[%x,%x] / kentry/args/envs vsegs registered / cycle %d\n",
1461	__FUNCTION__, pid, thread->trdid, cycle );
1462	#endif
1463
1464	// register code & data vsegs as well as entry-point in process VMM,
1465	// and register extended pointer on .elf file in process descriptor
1466	error = elf_load_process( file_xp , process );
1467	if( error )
1468	{
1469	printk("\n[ERROR] in %s : failed to access <%s>\n", __FUNCTION__ , path );
1470	vfs_close( file_xp , file_id );
1471	// FIXME restore old process VMM
1472	return -1;
1473	}
1474
1475	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1476	cycle = (uint32_t)hal_get_cycles();
1477	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1478	printk("\n[%s] thread[%x,%x] / code/data vsegs registered / cycle %d\n",
1479	__FUNCTION__, pid, thread->trdid, cycle );
1480	#endif
1481
1482	// update the existing main thread descriptor... and jump to user code
1483	error = thread_user_exec( (void *)process->vmm.entry_point,
1484	args_nr,
1485	args_pointers );
1486	if( error )
1487	{
1488	printk("\n[ERROR] in %s : cannot update main thread for %s\n", __FUNCTION__ , path );
1489	vfs_close( file_xp , file_id );
1490	// FIXME restore old process VMM
1491	return -1;
1492	}
1493
1494	assert( false, "we should not execute this code");
1495
1496	return 0;
1497
1498	} // end process_make_exec()
1499
1500
1501	///////////////////////////////////////////////
1502	void process_zero_create( process_t * process )
1503	{
1504	error_t error;
1505	pid_t pid;
1506
1507	#if DEBUG_PROCESS_ZERO_CREATE
1508	uint32_t cycle = (uint32_t)hal_get_cycles();
1509	if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1510	printk("\n[%s] enter / cluster %x / cycle %d\n",
1511	__FUNCTION__, local_cxy, cycle );
1512	#endif
1513
1514	// get PID from local cluster manager for this kernel process
1515	error = cluster_pid_alloc( process , &pid );
1516
1517	if( error \|\| (LPID_FROM_PID( pid ) != 0) )
1518	{
1519	printk("\n[PANIC] in %s : cannot get valid PID in cluster %x / PID = %x\n",
1520	__FUNCTION__ , local_cxy, pid );
1521	hal_core_sleep();
1522	}
1523
1524	// initialize PID, REF_XP, PARENT_XP, and STATE
1525	// the kernel process_zero is its own parent_process,
1526	// reference_process, and owner_process, and cannot be killed...
1527	process->pid = pid;
1528	process->ref_xp = XPTR( local_cxy , process );
1529	process->owner_xp = XPTR( local_cxy , process );
1530	process->parent_xp = XPTR( local_cxy , process );
1531	process->term_state = 0;
1532
1533	// reset th_tbl[] array and associated fields
1534	uint32_t i;
1535	for( i = 0 ; i < CONFIG_THREADS_MAX_PER_CLUSTER ; i++ )
1536	{
1537	process->th_tbl[i] = NULL;
1538	}
1539	process->th_nr = 0;
1540	rwlock_init( &process->th_lock , LOCK_PROCESS_THTBL );
1541
1542
1543	// reset children list as empty
1544	xlist_root_init( XPTR( local_cxy , &process->children_root ) );
1545	process->children_nr = 0;
1546	remote_queuelock_init( XPTR( local_cxy , &process->children_lock ),
1547	LOCK_PROCESS_CHILDREN );
1548
1549	// register kernel process in cluster manager local_list
1550	cluster_process_local_link( process );
1551
1552	hal_fence();
1553
1554	#if DEBUG_PROCESS_ZERO_CREATE
1555	cycle = (uint32_t)hal_get_cycles();
1556	if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1557	printk("\n[%s] exit / cluster %x / cycle %d\n",
1558	__FUNCTION__, local_cxy, cycle );
1559	#endif
1560
1561	} // end process_zero_create()
1562
1563	////////////////////////////////
1564	void process_init_create( void )
1565	{
1566	process_t * process; // local pointer on process descriptor
1567	pid_t pid; // process_init identifier
1568	thread_t * thread; // local pointer on main thread
1569	pthread_attr_t attr; // main thread attributes
1570	lid_t lid; // selected core local index for main thread
1571	xptr_t file_xp; // extended pointer on .elf file descriptor
1572	uint32_t file_id; // file index in fd_array
1573	error_t error;
1574
1575	#if DEBUG_PROCESS_INIT_CREATE
1576	thread_t * this = CURRENT_THREAD;
1577	uint32_t cycle = (uint32_t)hal_get_cycles();
1578	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1579	printk("\n[%s] thread[%x,%x] enter / cycle %d\n",
1580	__FUNCTION__, this->process->pid, this->trdid, cycle );
1581	#endif
1582
1583	// allocates memory for process descriptor from local cluster
1584	process = process_alloc();
1585
1586	// check memory allocator
1587	assert( (process != NULL),
1588	"no memory for process descriptor in cluster %x\n", local_cxy );
1589
1590	// set the CWD and VFS_ROOT fields in process descriptor
1591	process->cwd_xp = process_zero.vfs_root_xp;
1592	process->vfs_root_xp = process_zero.vfs_root_xp;
1593
1594	// get PID from local cluster
1595	error = cluster_pid_alloc( process , &pid );
1596
1597	// check PID allocator
1598	assert( (error == 0),
1599	"cannot allocate PID in cluster %x\n", local_cxy );
1600
1601	// check PID value
1602	assert( (pid == 1) ,
1603	"process INIT must be first process in cluster 0\n" );
1604
1605	// initialize process descriptor / parent is local process_zero
1606	process_reference_init( process,
1607	pid,
1608	XPTR( local_cxy , &process_zero ) );
1609
1610	#if(DEBUG_PROCESS_INIT_CREATE & 1)
1611	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1612	printk("\n[%s] thread[%x,%x] initialized process descriptor\n",
1613	__FUNCTION__, this->process->pid, this->trdid );
1614	#endif
1615
1616	// open the file identified by CONFIG_PROCESS_INIT_PATH
1617	file_xp = XPTR_NULL;
1618	file_id = -1;
1619	error = vfs_open( process->vfs_root_xp,
1620	CONFIG_PROCESS_INIT_PATH,
1621	XPTR( local_cxy , process ),
1622	O_RDONLY,
1623	0,
1624	&file_xp,
1625	&file_id );
1626
1627	assert( (error == 0),
1628	"failed to open file <%s>\n", CONFIG_PROCESS_INIT_PATH );
1629
1630	#if(DEBUG_PROCESS_INIT_CREATE & 1)
1631	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1632	printk("\n[%s] thread[%x,%x] open .elf file decriptor\n",
1633	__FUNCTION__, this->process->pid, this->trdid );
1634	#endif
1635
1636	// register "code" and "data" vsegs as well as entry-point
1637	// in process VMM, using information contained in the elf file.
1638	error = elf_load_process( file_xp , process );
1639
1640	assert( (error == 0),
1641	"cannot access .elf file <%s>\n", CONFIG_PROCESS_INIT_PATH );
1642
1643	#if(DEBUG_PROCESS_INIT_CREATE & 1)
1644	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1645	printk("\n[%s] thread[%x,%x] registered code/data vsegs in VMM\n",
1646	__FUNCTION__, this->process->pid, this->trdid );
1647	#endif
1648
1649	// get extended pointers on process_zero children_root, children_lock
1650	xptr_t children_root_xp = XPTR( local_cxy , &process_zero.children_root );
1651	xptr_t children_lock_xp = XPTR( local_cxy , &process_zero.children_lock );
1652
1653	// take lock protecting kernel process children list
1654	remote_queuelock_acquire( children_lock_xp );
1655
1656	// register process INIT in parent local process_zero
1657	xlist_add_last( children_root_xp , XPTR( local_cxy , &process->children_list ) );
1658	hal_atomic_add( &process_zero.children_nr , 1 );
1659
1660	// release lock protecting kernel process children list
1661	remote_queuelock_release( children_lock_xp );
1662
1663	#if(DEBUG_PROCESS_INIT_CREATE & 1)
1664	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1665	printk("\n[%s] thread[%x,%x] registered init process in parent\n",
1666	__FUNCTION__, this->process->pid, this->trdid );
1667	#endif
1668
1669	// select a core in local cluster to execute the main thread
1670	lid = cluster_select_local_core();
1671
1672	// initialize pthread attributes for main thread
1673	attr.attributes = PT_ATTR_DETACH \| PT_ATTR_CLUSTER_DEFINED \| PT_ATTR_CORE_DEFINED;
1674	attr.cxy = local_cxy;
1675	attr.lid = lid;
1676
1677	// create and initialize thread descriptor
1678	error = thread_user_create( pid,
1679	(void *)process->vmm.entry_point,
1680	NULL,
1681	&attr,
1682	&thread );
1683
1684	assert( (error == 0),
1685	"cannot create main thread for <%s>\n", CONFIG_PROCESS_INIT_PATH );
1686
1687	assert( (thread->trdid == 0),
1688	"main thread must have index 0 for <%s>\n", CONFIG_PROCESS_INIT_PATH );
1689
1690	#if(DEBUG_PROCESS_INIT_CREATE & 1)
1691	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1692	printk("\n[%s] thread[%x,%x] created main thread\n",
1693	__FUNCTION__, this->process->pid, this->trdid );
1694	#endif
1695
1696	// activate thread
1697	thread_unblock( XPTR( local_cxy , thread ) , THREAD_BLOCKED_GLOBAL );
1698
1699	hal_fence();
1700
1701	#if DEBUG_PROCESS_INIT_CREATE
1702	cycle = (uint32_t)hal_get_cycles();
1703	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1704	printk("\n[%s] thread[%x,%x] exit / cycle %d\n",
1705	__FUNCTION__, this->process->pid, this->trdid, cycle );
1706	#endif
1707
1708	} // end process_init_create()
1709
1710	/////////////////////////////////////////
1711	void process_display( xptr_t process_xp )
1712	{
1713	process_t * process_ptr;
1714	cxy_t process_cxy;
1715
1716	xptr_t parent_xp; // extended pointer on parent process
1717	process_t * parent_ptr;
1718	cxy_t parent_cxy;
1719
1720	xptr_t owner_xp; // extended pointer on owner process
1721	process_t * owner_ptr;
1722	cxy_t owner_cxy;
1723
1724	pid_t pid;
1725	pid_t ppid;
1726	lpid_t lpid;
1727	uint32_t state;
1728	uint32_t th_nr;
1729
1730	xptr_t txt_file_xp; // extended pointer on TXT_RX file descriptor
1731	xptr_t txt_chdev_xp; // extended pointer on TXT_RX chdev
1732	chdev_t * txt_chdev_ptr;
1733	cxy_t txt_chdev_cxy;
1734	xptr_t txt_owner_xp; // extended pointer on TXT owner process
1735
1736	xptr_t elf_file_xp; // extended pointer on .elf file
1737	cxy_t elf_file_cxy;
1738	vfs_file_t * elf_file_ptr;
1739	vfs_inode_t * elf_inode_ptr; // local pointer on .elf inode
1740
1741	char txt_name[CONFIG_VFS_MAX_NAME_LENGTH];
1742	char elf_name[CONFIG_VFS_MAX_NAME_LENGTH];
1743
1744	// get cluster and local pointer on process
1745	process_ptr = GET_PTR( process_xp );
1746	process_cxy = GET_CXY( process_xp );
1747
1748	// get process PID, LPID, and state
1749	pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid ) );
1750	lpid = LPID_FROM_PID( pid );
1751	state = hal_remote_l32( XPTR( process_cxy , &process_ptr->term_state ) );
1752
1753	// get process PPID
1754	parent_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->parent_xp ) );
1755	parent_cxy = GET_CXY( parent_xp );
1756	parent_ptr = GET_PTR( parent_xp );
1757	ppid = hal_remote_l32( XPTR( parent_cxy , &parent_ptr->pid ) );
1758
1759	// get number of threads
1760	th_nr = hal_remote_l32( XPTR( process_cxy , &process_ptr->th_nr ) );
1761
1762	// get pointers on owner process descriptor
1763	owner_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->owner_xp ) );
1764	owner_cxy = GET_CXY( owner_xp );
1765	owner_ptr = GET_PTR( owner_xp );
1766
1767	// get process TXT name and .elf name
1768	if( lpid ) // user process
1769	{
1770
1771	// get extended pointer on file descriptor associated to TXT_RX
1772	txt_file_xp = hal_remote_l64( XPTR( owner_cxy , &owner_ptr->fd_array.array[0] ) );
1773
1774	assert( (txt_file_xp != XPTR_NULL) ,
1775	"process must be attached to one TXT terminal\n" );
1776
1777	// get TXT_RX chdev pointers
1778	txt_chdev_xp = chdev_from_file( txt_file_xp );
1779	txt_chdev_cxy = GET_CXY( txt_chdev_xp );
1780	txt_chdev_ptr = GET_PTR( txt_chdev_xp );
1781
1782	// get TXT_RX name and ownership
1783	hal_remote_strcpy( XPTR( local_cxy , txt_name ) ,
1784	XPTR( txt_chdev_cxy , txt_chdev_ptr->name ) );
1785
1786	txt_owner_xp = (xptr_t)hal_remote_l64( XPTR( txt_chdev_cxy,
1787	&txt_chdev_ptr->ext.txt.owner_xp ) );
1788
1789	// get process .elf name
1790	elf_file_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->vfs_bin_xp ) );
1791	elf_file_cxy = GET_CXY( elf_file_xp );
1792	elf_file_ptr = GET_PTR( elf_file_xp );
1793	elf_inode_ptr = hal_remote_lpt( XPTR( elf_file_cxy , &elf_file_ptr->inode ) );
1794	vfs_inode_get_name( XPTR( elf_file_cxy , elf_inode_ptr ) , elf_name );
1795	}
1796	else // kernel process_zero
1797	{
1798	// TXT name and .elf name are not registered in kernel process_zero
1799	strcpy( txt_name , "txt0_rx" );
1800	txt_owner_xp = process_xp;
1801	strcpy( elf_name , "kernel.elf" );
1802	}
1803
1804	// display process info
1805	if( txt_owner_xp == process_xp )
1806	{
1807	nolock_printk("PID %X \| %s (FG) \| %X \| PPID %X \| TS %X \| %d \| %s\n",
1808	pid, txt_name, process_ptr, ppid, state, th_nr, elf_name );
1809	}
1810	else
1811	{
1812	nolock_printk("PID %X \| %s (BG) \| %X \| PPID %X \| TS %X \| %d \| %s\n",
1813	pid, txt_name, process_ptr, ppid, state, th_nr, elf_name );
1814	}
1815	} // end process_display()
1816
1817
1818	////////////////////////////////////////////////////////////////////////////////////////
1819	// Terminals related functions
1820	////////////////////////////////////////////////////////////////////////////////////////
1821
1822	//////////////////////////////////
1823	uint32_t process_txt_alloc( void )
1824	{
1825	uint32_t index; // TXT terminal index
1826	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
1827	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
1828	cxy_t chdev_cxy; // TXT_RX chdev cluster
1829	xptr_t root_xp; // extended pointer on owner field in chdev
1830
1831	// scan the user TXT_RX chdevs (TXT0 is reserved for kernel)
1832	for( index = 1 ; index < LOCAL_CLUSTER->nb_txt_channels ; index ++ )
1833	{
1834	// get pointers on TXT_RX[index]
1835	chdev_xp = chdev_dir.txt_rx[index];
1836	chdev_cxy = GET_CXY( chdev_xp );
1837	chdev_ptr = GET_PTR( chdev_xp );
1838
1839	// get extended pointer on root of attached process
1840	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
1841
1842	// return free TXT index if found
1843	if( xlist_is_empty( root_xp ) ) return index;
1844	}
1845
1846	assert( false , "no free TXT terminal found" );
1847
1848	return -1;
1849
1850	} // end process_txt_alloc()
1851
1852	/////////////////////////////////////////////
1853	void process_txt_attach( process_t * process,
1854	uint32_t txt_id )
1855	{
1856	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
1857	cxy_t chdev_cxy; // TXT_RX chdev cluster
1858	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
1859	xptr_t root_xp; // extended pointer on list root in chdev
1860	xptr_t lock_xp; // extended pointer on list lock in chdev
1861
1862	// check process is in owner cluster
1863	assert( (CXY_FROM_PID( process->pid ) == local_cxy) ,
1864	"process descriptor not in owner cluster" );
1865
1866	// check terminal index
1867	assert( (txt_id < LOCAL_CLUSTER->nb_txt_channels) ,
1868	"illegal TXT terminal index" );
1869
1870	// get pointers on TXT_RX[txt_id] chdev
1871	chdev_xp = chdev_dir.txt_rx[txt_id];
1872	chdev_cxy = GET_CXY( chdev_xp );
1873	chdev_ptr = GET_PTR( chdev_xp );
1874
1875	// get extended pointer on root & lock of attached process list
1876	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
1877	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
1878
1879	// get lock protecting list of processes attached to TXT
1880	remote_busylock_acquire( lock_xp );
1881
1882	// insert process in attached process list
1883	xlist_add_last( root_xp , XPTR( local_cxy , &process->txt_list ) );
1884
1885	// release lock protecting list of processes attached to TXT
1886	remote_busylock_release( lock_xp );
1887
1888	#if DEBUG_PROCESS_TXT
1889	thread_t * this = CURRENT_THREAD;
1890	uint32_t cycle = (uint32_t)hal_get_cycles();
1891	if( DEBUG_PROCESS_TXT < cycle )
1892	printk("\n[%s] thread[%x,%x] attached process %x to TXT %d / cycle %d\n",
1893	__FUNCTION__, this->process->pid, this->trdid, process->pid, txt_id , cycle );
1894	#endif
1895
1896	} // end process_txt_attach()
1897
1898	/////////////////////////////////////////////
1899	void process_txt_detach( xptr_t process_xp )
1900	{
1901	process_t * process_ptr; // local pointer on process in owner cluster
1902	cxy_t process_cxy; // process owner cluster
1903	pid_t process_pid; // process identifier
1904	xptr_t file_xp; // extended pointer on stdin file
1905	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
1906	cxy_t chdev_cxy; // TXT_RX chdev cluster
1907	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
1908	xptr_t lock_xp; // extended pointer on list lock in chdev
1909
1910	// get process cluster, local pointer, and PID
1911	process_cxy = GET_CXY( process_xp );
1912	process_ptr = GET_PTR( process_xp );
1913	process_pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid ) );
1914
1915	// check process descriptor in owner cluster
1916	assert( (CXY_FROM_PID( process_pid ) == process_cxy ) ,
1917	"process descriptor not in owner cluster" );
1918
1919	// release TXT ownership (does nothing if not TXT owner)
1920	process_txt_transfer_ownership( process_xp );
1921
1922	// get extended pointer on process stdin file
1923	file_xp = (xptr_t)hal_remote_l64( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1924
1925	// get pointers on TXT_RX chdev
1926	chdev_xp = chdev_from_file( file_xp );
1927	chdev_cxy = GET_CXY( chdev_xp );
1928	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
1929
1930	// get extended pointer on lock protecting attached process list
1931	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
1932
1933	// get lock protecting list of processes attached to TXT
1934	remote_busylock_acquire( lock_xp );
1935
1936	// unlink process from attached process list
1937	xlist_unlink( XPTR( process_cxy , &process_ptr->txt_list ) );
1938
1939	// release lock protecting list of processes attached to TXT
1940	remote_busylock_release( lock_xp );
1941
1942	#if DEBUG_PROCESS_TXT
1943	thread_t * this = CURRENT_THREAD;
1944	uint32_t cycle = (uint32_t)hal_get_cycles();
1945	uint32_t txt_id = hal_remote_l32( XPTR( chdev_cxy , &chdev_ptr->channel ) );
1946	if( DEBUG_PROCESS_TXT < cycle )
1947	printk("\n[%s] thread[%x,%x] detached process %x from TXT %d / cycle %d\n",
1948	__FUNCTION__, this->process->pid, this->trdid, process_pid, txt_id, cycle );
1949	#endif
1950
1951	} // end process_txt_detach()
1952
1953	///////////////////////////////////////////////////
1954	void process_txt_set_ownership( xptr_t process_xp )
1955	{
1956	process_t * process_ptr;
1957	cxy_t process_cxy;
1958	pid_t process_pid;
1959	xptr_t file_xp;
1960	xptr_t txt_xp;
1961	chdev_t * txt_ptr;
1962	cxy_t txt_cxy;
1963
1964	// get pointers on process in owner cluster
1965	process_cxy = GET_CXY( process_xp );
1966	process_ptr = GET_PTR( process_xp );
1967	process_pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid ) );
1968
1969	// check owner cluster
1970	assert( (process_cxy == CXY_FROM_PID( process_pid )) ,
1971	"process descriptor not in owner cluster\n" );
1972
1973	// get extended pointer on stdin pseudo file
1974	file_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1975
1976	// get pointers on TXT chdev
1977	txt_xp = chdev_from_file( file_xp );
1978	txt_cxy = GET_CXY( txt_xp );
1979	txt_ptr = GET_PTR( txt_xp );
1980
1981	// set owner field in TXT chdev
1982	hal_remote_s64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , process_xp );
1983
1984	#if DEBUG_PROCESS_TXT
1985	thread_t * this = CURRENT_THREAD;
1986	uint32_t cycle = (uint32_t)hal_get_cycles();
1987	uint32_t txt_id = hal_remote_l32( XPTR( txt_cxy , &txt_ptr->channel ) );
1988	if( DEBUG_PROCESS_TXT < cycle )
1989	printk("\n[%s] thread[%x,%x] give TXT %d to process %x / cycle %d\n",
1990	__FUNCTION__, this->process->pid, this->trdid, txt_id, process_pid, cycle );
1991	#endif
1992
1993	} // end process_txt_set ownership()
1994
1995	////////////////////////////////////////////////////////
1996	void process_txt_transfer_ownership( xptr_t process_xp )
1997	{
1998	process_t * process_ptr; // local pointer on process releasing ownership
1999	cxy_t process_cxy; // process cluster
2000	pid_t process_pid; // process identifier
2001	xptr_t file_xp; // extended pointer on TXT_RX pseudo file
2002	xptr_t txt_xp; // extended pointer on TXT_RX chdev
2003	chdev_t * txt_ptr; // local pointer on TXT_RX chdev
2004	cxy_t txt_cxy; // cluster of TXT_RX chdev
2005	uint32_t txt_id; // TXT_RX channel
2006	xptr_t owner_xp; // extended pointer on current TXT_RX owner
2007	xptr_t root_xp; // extended pointer on root of attached process list
2008	xptr_t lock_xp; // extended pointer on lock protecting attached process list
2009	xptr_t iter_xp; // iterator for xlist
2010	xptr_t current_xp; // extended pointer on current process
2011	process_t * current_ptr; // local pointer on current process
2012	cxy_t current_cxy; // cluster for current process
2013
2014	#if DEBUG_PROCESS_TXT
2015	thread_t * this = CURRENT_THREAD;
2016	uint32_t cycle;
2017	#endif
2018
2019	// get pointers on process in owner cluster
2020	process_cxy = GET_CXY( process_xp );
2021	process_ptr = GET_PTR( process_xp );
2022	process_pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid ) );
2023
2024	// check owner cluster
2025	assert( (process_cxy == CXY_FROM_PID( process_pid )) ,
2026	"process descriptor not in owner cluster\n" );
2027
2028	// get extended pointer on stdin pseudo file
2029	file_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
2030
2031	// get pointers on TXT chdev
2032	txt_xp = chdev_from_file( file_xp );
2033	txt_cxy = GET_CXY( txt_xp );
2034	txt_ptr = GET_PTR( txt_xp );
2035
2036	// get extended pointer on TXT_RX owner and TXT channel
2037	owner_xp = hal_remote_l64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) );
2038	txt_id = hal_remote_l32 ( XPTR( txt_cxy , &txt_ptr->channel ) );
2039
2040	// transfer ownership only if process is the TXT owner
2041	if( (owner_xp == process_xp) && (txt_id > 0) )
2042	{
2043	// get extended pointers on root and lock of attached processes list
2044	root_xp = XPTR( txt_cxy , &txt_ptr->ext.txt.root );
2045	lock_xp = XPTR( txt_cxy , &txt_ptr->ext.txt.lock );
2046
2047	// get lock
2048	remote_busylock_acquire( lock_xp );
2049
2050	if( process_get_ppid( process_xp ) != 1 ) // process is not KSH
2051	{
2052	// scan attached process list to find KSH process
2053	XLIST_FOREACH( root_xp , iter_xp )
2054	{
2055	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
2056	current_cxy = GET_CXY( current_xp );
2057	current_ptr = GET_PTR( current_xp );
2058
2059	if( process_get_ppid( current_xp ) == 1 ) // current is KSH
2060	{
2061	// release lock
2062	remote_busylock_release( lock_xp );
2063
2064	// set owner field in TXT chdev
2065	hal_remote_s64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , current_xp );
2066
2067	#if DEBUG_PROCESS_TXT
2068	cycle = (uint32_t)hal_get_cycles();
2069	uint32_t ksh_pid = hal_remote_l32( XPTR( current_cxy , &current_ptr->pid ) );
2070	if( DEBUG_PROCESS_TXT < cycle )
2071	printk("\n[%s] thread[%x,%x] release TXT %d to KSH %x / cycle %d\n",
2072	__FUNCTION__, this->process->pid, this->trdid, txt_id, ksh_pid, cycle );
2073	process_txt_display( txt_id );
2074	#endif
2075	return;
2076	}
2077	}
2078
2079	// release lock
2080	remote_busylock_release( lock_xp );
2081
2082	// PANIC if KSH not found
2083	assert( false , "KSH process not found for TXT %d" );
2084
2085	return;
2086	}
2087	else // process is KSH
2088	{
2089	// scan attached process list to find another process
2090	XLIST_FOREACH( root_xp , iter_xp )
2091	{
2092	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
2093	current_cxy = GET_CXY( current_xp );
2094	current_ptr = GET_PTR( current_xp );
2095
2096	if( current_xp != process_xp ) // current is not KSH
2097	{
2098	// release lock
2099	remote_busylock_release( lock_xp );
2100
2101	// set owner field in TXT chdev
2102	hal_remote_s64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , current_xp );
2103
2104	#if DEBUG_PROCESS_TXT
2105	cycle = (uint32_t)hal_get_cycles();
2106	uint32_t new_pid = hal_remote_l32( XPTR( current_cxy , &current_ptr->pid ) );
2107	if( DEBUG_PROCESS_TXT < cycle )
2108	printk("\n[%s] thread[%x,%x] release TXT %d to process %x / cycle %d\n",
2109	__FUNCTION__,this->process->pid, this->trdid, txt_id, new_pid, cycle );
2110	process_txt_display( txt_id );
2111	#endif
2112	return;
2113	}
2114	}
2115
2116	// release lock
2117	remote_busylock_release( lock_xp );
2118
2119	// no more owner for TXT if no other process found
2120	hal_remote_s64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , XPTR_NULL );
2121
2122	#if DEBUG_PROCESS_TXT
2123	cycle = (uint32_t)hal_get_cycles();
2124	if( DEBUG_PROCESS_TXT < cycle )
2125	printk("\n[%s] thread[%x,%x] release TXT %d to nobody / cycle %d\n",
2126	__FUNCTION__, this->process->pid, this->trdid, txt_id, cycle );
2127	process_txt_display( txt_id );
2128	#endif
2129	return;
2130	}
2131	}
2132	else
2133	{
2134
2135	#if DEBUG_PROCESS_TXT
2136	cycle = (uint32_t)hal_get_cycles();
2137	if( DEBUG_PROCESS_TXT < cycle )
2138	printk("\n[%s] thread %x in process %d does nothing (not TXT owner) / cycle %d\n",
2139	__FUNCTION__, this->trdid, process_pid, cycle );
2140	process_txt_display( txt_id );
2141	#endif
2142
2143	}
2144	} // end process_txt_transfer_ownership()
2145
2146
2147	////////////////////////////////////////////////
2148	bool_t process_txt_is_owner( xptr_t process_xp )
2149	{
2150	// get local pointer and cluster of process in owner cluster
2151	cxy_t process_cxy = GET_CXY( process_xp );
2152	process_t * process_ptr = GET_PTR( process_xp );
2153
2154	// check calling thread execute in target process owner cluster
2155	pid_t process_pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid ) );
2156	assert( (process_cxy == CXY_FROM_PID( process_pid )) ,
2157	"process descriptor not in owner cluster\n" );
2158
2159	// get extended pointer on stdin pseudo file
2160	xptr_t file_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
2161
2162	// get pointers on TXT chdev
2163	xptr_t txt_xp = chdev_from_file( file_xp );
2164	cxy_t txt_cxy = GET_CXY( txt_xp );
2165	chdev_t * txt_ptr = GET_PTR( txt_xp );
2166
2167	// get extended pointer on TXT_RX owner process
2168	xptr_t owner_xp = hal_remote_l64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) );
2169
2170	return (process_xp == owner_xp);
2171
2172	} // end process_txt_is_owner()
2173
2174	////////////////////////////////////////////////
2175	xptr_t process_txt_get_owner( uint32_t channel )
2176	{
2177	xptr_t txt_rx_xp = chdev_dir.txt_rx[channel];
2178	cxy_t txt_rx_cxy = GET_CXY( txt_rx_xp );
2179	chdev_t * txt_rx_ptr = GET_PTR( txt_rx_xp );
2180
2181	return (xptr_t)hal_remote_l64( XPTR( txt_rx_cxy , &txt_rx_ptr->ext.txt.owner_xp ) );
2182
2183	} // end process_txt_get_owner()
2184
2185	///////////////////////////////////////////
2186	void process_txt_display( uint32_t txt_id )
2187	{
2188	xptr_t chdev_xp;
2189	cxy_t chdev_cxy;
2190	chdev_t * chdev_ptr;
2191	xptr_t root_xp;
2192	xptr_t lock_xp;
2193	xptr_t current_xp;
2194	xptr_t iter_xp;
2195	cxy_t txt0_cxy;
2196	chdev_t * txt0_ptr;
2197	xptr_t txt0_xp;
2198	xptr_t txt0_lock_xp;
2199
2200	assert( (txt_id < LOCAL_CLUSTER->nb_txt_channels) ,
2201	"illegal TXT terminal index" );
2202
2203	// get pointers on TXT0 chdev
2204	txt0_xp = chdev_dir.txt_tx[0];
2205	txt0_cxy = GET_CXY( txt0_xp );
2206	txt0_ptr = GET_PTR( txt0_xp );
2207
2208	// get extended pointer on TXT0 lock
2209	txt0_lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
2210
2211	// get pointers on TXT_RX[txt_id] chdev
2212	chdev_xp = chdev_dir.txt_rx[txt_id];
2213	chdev_cxy = GET_CXY( chdev_xp );
2214	chdev_ptr = GET_PTR( chdev_xp );
2215
2216	// get extended pointer on root & lock of attached process list
2217	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
2218	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
2219
2220	// get lock on attached process list
2221	remote_busylock_acquire( lock_xp );
2222
2223	// get TXT0 lock in busy waiting mode
2224	remote_busylock_acquire( txt0_lock_xp );
2225
2226	// display header
2227	nolock_printk("\n***** processes attached to TXT_%d / cycle %d\n",
2228	txt_id , (uint32_t)hal_get_cycles() );
2229
2230	// scan attached process list
2231	XLIST_FOREACH( root_xp , iter_xp )
2232	{
2233	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
2234	process_display( current_xp );
2235	}
2236
2237	// release TXT0 lock in busy waiting mode
2238	remote_busylock_release( txt0_lock_xp );
2239
2240	// release lock on attached process list
2241	remote_busylock_release( lock_xp );
2242
2243	} // end process_txt_display

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