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source: trunk/kernel/kern/process.c @ 633

Last change on this file since 633 was 633, checked in by alain, 5 years ago
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File size: 83.1 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 (2016,2017,2018,2019)
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 <hal_vmm.h>
32	#include <errno.h>
33	#include <printk.h>
34	#include <memcpy.h>
35	#include <bits.h>
36	#include <kmem.h>
37	#include <page.h>
38	#include <vmm.h>
39	#include <vfs.h>
40	#include <core.h>
41	#include <thread.h>
42	#include <chdev.h>
43	#include <list.h>
44	#include <string.h>
45	#include <scheduler.h>
46	#include <busylock.h>
47	#include <queuelock.h>
48	#include <remote_queuelock.h>
49	#include <rwlock.h>
50	#include <remote_rwlock.h>
51	#include <dqdt.h>
52	#include <cluster.h>
53	#include <ppm.h>
54	#include <boot_info.h>
55	#include <process.h>
56	#include <elf.h>
57	#include <syscalls.h>
58	#include <shared_syscalls.h>
59
60	//////////////////////////////////////////////////////////////////////////////////////////
61	// Extern global variables
62	//////////////////////////////////////////////////////////////////////////////////////////
63
64	extern process_t process_zero; // allocated in kernel_init.c
65	extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
66
67	//////////////////////////////////////////////////////////////////////////////////////////
68	// Process initialisation related functions
69	//////////////////////////////////////////////////////////////////////////////////////////
70
71	/////////////////////////////////
72	process_t * process_alloc( void )
73	{
74	kmem_req_t req;
75
76	req.type = KMEM_PROCESS;
77	req.size = sizeof(process_t);
78	req.flags = AF_KERNEL;
79
80	return (process_t *)kmem_alloc( &req );
81	}
82
83	////////////////////////////////////////
84	void process_free( process_t * process )
85	{
86	kmem_req_t req;
87
88	req.type = KMEM_PROCESS;
89	req.ptr = process;
90	kmem_free( &req );
91	}
92
93	////////////////////////////////////////////////////
94	error_t process_reference_init( process_t * process,
95	pid_t pid,
96	xptr_t parent_xp )
97	{
98	error_t error;
99	xptr_t process_xp;
100	cxy_t parent_cxy;
101	process_t * parent_ptr;
102	xptr_t stdin_xp;
103	xptr_t stdout_xp;
104	xptr_t stderr_xp;
105	uint32_t stdin_id;
106	uint32_t stdout_id;
107	uint32_t stderr_id;
108	uint32_t txt_id;
109	char rx_path[40];
110	char tx_path[40];
111	xptr_t file_xp;
112	xptr_t chdev_xp;
113	chdev_t * chdev_ptr;
114	cxy_t chdev_cxy;
115	pid_t parent_pid;
116	vmm_t * vmm;
117
118	// build extended pointer on this reference process
119	process_xp = XPTR( local_cxy , process );
120
121	// get pointer on process vmm
122	vmm = &process->vmm;
123
124	// get parent process cluster and local pointer
125	parent_cxy = GET_CXY( parent_xp );
126	parent_ptr = GET_PTR( parent_xp );
127
128	// get parent_pid
129	parent_pid = hal_remote_l32( XPTR( parent_cxy , &parent_ptr->pid ) );
130
131	#if DEBUG_PROCESS_REFERENCE_INIT
132	thread_t * this = CURRENT_THREAD;
133	uint32_t cycle = (uint32_t)hal_get_cycles();
134	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
135	printk("\n[%s] thread[%x,%x] enter to initialize process %x / cycle %d\n",
136	__FUNCTION__, this->process->pid, this->trdid, pid, cycle );
137	#endif
138
139	// initialize pid, ref_xp, parent_xp, owner_xp, term_state fields
140	process->pid = pid;
141	process->ref_xp = XPTR( local_cxy , process );
142	process->owner_xp = XPTR( local_cxy , process );
143	process->parent_xp = parent_xp;
144	process->term_state = 0;
145
146	// initialize VFS root inode and CWD inode
147	process->vfs_root_xp = hal_remote_l64( XPTR( parent_cxy, &parent_ptr->vfs_root_xp ) );
148	process->cwd_xp = hal_remote_l64( XPTR( parent_cxy, &parent_ptr->cwd_xp ) );
149
150	// initialize VSL as empty
151	vmm->vsegs_nr = 0;
152	xlist_root_init( XPTR( local_cxy , &vmm->vsegs_root ) );
153
154	// create an empty GPT as required by the architecture
155	error = hal_gpt_create( &vmm->gpt );
156	if( error )
157	{
158	printk("\n[ERROR] in %s : cannot create empty GPT\n", __FUNCTION__ );
159	return -1;
160	}
161
162	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
163	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
164	printk("\n[%s] thread[%x,%x] created empty GPT for process %x\n",
165	__FUNCTION__, parent_pid, this->trdid, pid );
166	#endif
167
168	// initialize VSL locks
169	remote_rwlock_init( XPTR( local_cxy , &vmm->vsl_lock ) , LOCK_VMM_VSL );
170
171	// register kernel vsegs in VMM as required by the architecture
172	error = hal_vmm_kernel_update( process );
173	if( error )
174	{
175	printk("\n[ERROR] in %s : cannot register kernel vsegs in VMM\n", __FUNCTION__ );
176	return -1;
177	}
178
179	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
180	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
181	printk("\n[%s] thread[%x,%x] registered kernel vsegs for process %x\n",
182	__FUNCTION__, parent_pid, this->trdid, pid );
183	#endif
184
185	// create "args" and "envs" vsegs
186	// create "stacks" and "mmap" vsegs allocators
187	// initialize locks protecting GPT and VSL
188	error = vmm_user_init( process );
189	if( error )
190	{
191	printk("\n[ERROR] in %s : cannot register user vsegs in VMM\n", __FUNCTION__ );
192	return -1;
193	}
194
195	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
196	cycle = (uint32_t)hal_get_cycles();
197	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
198	printk("\n[%s] thread[%x,%x] initialized vmm for process %x\n",
199	__FUNCTION__, parent_pid, this->trdid, pid );
200	#endif
201
202	// initialize fd_array as empty
203	process_fd_init( process );
204
205	// define the stdin/stdout/stderr pseudo files <=> select a TXT terminal.
206	if( (pid == 1) \|\| (parent_pid == 1) ) // INIT or KSH process
207	{
208	// select a TXT channel
209	if( pid == 1 ) txt_id = 0; // INIT
210	else txt_id = process_txt_alloc(); // KSH
211
212	// attach process to TXT
213	process_txt_attach( process , txt_id );
214
215	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
216	cycle = (uint32_t)hal_get_cycles();
217	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
218	printk("\n[%s] thread[%x,%x] / process %x attached to TXT%d / cycle %d\n",
219	__FUNCTION__, parent_pid, this->trdid, pid, txt_id, cycle );
220	#endif
221	// build path to TXT_RX[i] and TXT_TX[i] chdevs
222	snprintf( rx_path , 40 , "/dev/external/txt%d_rx", txt_id );
223	snprintf( tx_path , 40 , "/dev/external/txt%d_tx", txt_id );
224
225	// create stdin pseudo file
226	error = vfs_open( process->vfs_root_xp,
227	rx_path,
228	process_xp,
229	O_RDONLY,
230	0, // FIXME chmod
231	&stdin_xp,
232	&stdin_id );
233	if( error )
234	{
235	printk("\n[ERROR] in %s : cannot open stdout pseudo-file\n", __FUNCTION__ );
236	return -1;
237	}
238
239	assert( (stdin_id == 0) , "stdin index must be 0" );
240
241	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
242	cycle = (uint32_t)hal_get_cycles();
243	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
244	printk("\n[%s] thread[%x,%x] / stdin open for process %x / cycle %d\n",
245	__FUNCTION__, parent_pid, this->trdid, pid, cycle );
246	#endif
247
248	// create stdout pseudo file
249	error = vfs_open( process->vfs_root_xp,
250	tx_path,
251	process_xp,
252	O_WRONLY,
253	0, // FIXME chmod
254	&stdout_xp,
255	&stdout_id );
256	if( error )
257	{
258	printk("\n[ERROR] in %s : cannot open stdout pseudo-file\n", __FUNCTION__ );
259	return -1;
260	}
261
262	assert( (stdout_id == 1) , "stdout index must be 1" );
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] / stdout open for process %x / cycle %d\n",
268	__FUNCTION__, parent_pid, this->trdid, pid, cycle );
269	#endif
270
271	// create stderr pseudo file
272	error = vfs_open( process->vfs_root_xp,
273	tx_path,
274	process_xp,
275	O_WRONLY,
276	0, // FIXME chmod
277	&stderr_xp,
278	&stderr_id );
279	if( error )
280	{
281	printk("\n[ERROR] in %s : cannot open stderr pseudo-file\n", __FUNCTION__ );
282	return -1;
283	}
284
285	assert( (stderr_id == 2) , "stderr index must be 2" );
286
287	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
288	cycle = (uint32_t)hal_get_cycles();
289	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
290	printk("\n[%s] thread[%x,%x] / stderr open for process %x / cycle %d\n",
291	__FUNCTION__, parent_pid, this->trdid, pid, cycle );
292	#endif
293
294	}
295	else // normal user process
296	{
297	// get extended pointer on stdin pseudo file in parent process
298	file_xp = (xptr_t)hal_remote_l64( XPTR( parent_cxy,
299	&parent_ptr->fd_array.array[0] ) );
300
301	// get extended pointer on parent process TXT chdev
302	chdev_xp = chdev_from_file( file_xp );
303
304	// get cluster and local pointer on chdev
305	chdev_cxy = GET_CXY( chdev_xp );
306	chdev_ptr = GET_PTR( chdev_xp );
307
308	// get parent process TXT terminal index
309	txt_id = hal_remote_l32( XPTR( chdev_cxy , &chdev_ptr->channel ) );
310
311	// attach child process to parent process TXT terminal
312	process_txt_attach( process , txt_id );
313
314	// copy all open files from parent process fd_array to this process
315	process_fd_remote_copy( XPTR( local_cxy , &process->fd_array ),
316	XPTR( parent_cxy , &parent_ptr->fd_array ) );
317	}
318
319	// initialize lock protecting CWD changes
320	remote_busylock_init( XPTR( local_cxy ,
321	&process->cwd_lock ), LOCK_PROCESS_CWD );
322
323	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
324	cycle = (uint32_t)hal_get_cycles();
325	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
326	printk("\n[%s] thread[%x,%x] / set fd_array for process %x / cycle %d\n",
327	__FUNCTION__, parent_pid, this->trdid, pid , cycle );
328	#endif
329
330	// reset children list root
331	xlist_root_init( XPTR( local_cxy , &process->children_root ) );
332	process->children_nr = 0;
333	remote_queuelock_init( XPTR( local_cxy,
334	&process->children_lock ), LOCK_PROCESS_CHILDREN );
335
336	// reset semaphore / mutex / barrier / condvar list roots and lock
337	xlist_root_init( XPTR( local_cxy , &process->sem_root ) );
338	xlist_root_init( XPTR( local_cxy , &process->mutex_root ) );
339	xlist_root_init( XPTR( local_cxy , &process->barrier_root ) );
340	xlist_root_init( XPTR( local_cxy , &process->condvar_root ) );
341	remote_queuelock_init( XPTR( local_cxy ,
342	&process->sync_lock ), LOCK_PROCESS_USERSYNC );
343
344	// reset open directories root and lock
345	xlist_root_init( XPTR( local_cxy , &process->dir_root ) );
346	remote_queuelock_init( XPTR( local_cxy ,
347	&process->dir_lock ), LOCK_PROCESS_DIR );
348
349	// register new process in the local cluster manager pref_tbl[]
350	lpid_t lpid = LPID_FROM_PID( pid );
351	LOCAL_CLUSTER->pmgr.pref_tbl[lpid] = XPTR( local_cxy , process );
352
353	// register new process descriptor in local cluster manager local_list
354	cluster_process_local_link( process );
355
356	// register new process descriptor in local cluster manager copies_list
357	cluster_process_copies_link( process );
358
359	// initialize th_tbl[] array and associated threads
360	uint32_t i;
361
362	for( i = 0 ; i < CONFIG_THREADS_MAX_PER_CLUSTER ; i++ )
363	{
364	process->th_tbl[i] = NULL;
365	}
366	process->th_nr = 0;
367	rwlock_init( &process->th_lock , LOCK_PROCESS_THTBL );
368
369	hal_fence();
370
371	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
372	cycle = (uint32_t)hal_get_cycles();
373	if( DEBUG_PROCESS_REFERENCE_INIT < cycle )
374	printk("\n[%s] thread[%x,%x] exit for process %x / cycle %d\n",
375	__FUNCTION__, parent_pid, this->trdid, pid, cycle );
376	#endif
377
378	return 0;
379
380	} // process_reference_init()
381
382	/////////////////////////////////////////////////////
383	error_t process_copy_init( process_t * local_process,
384	xptr_t reference_process_xp )
385	{
386	error_t error;
387	vmm_t * vmm;
388
389	// get reference process cluster and local pointer
390	cxy_t ref_cxy = GET_CXY( reference_process_xp );
391	process_t * ref_ptr = GET_PTR( reference_process_xp );
392
393	// get pointer on process vmm
394	vmm = &local_process->vmm;
395
396	// initialize PID, REF_XP, PARENT_XP, and STATE
397	local_process->pid = hal_remote_l32( XPTR( ref_cxy , &ref_ptr->pid ) );
398	local_process->parent_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->parent_xp ) );
399	local_process->ref_xp = reference_process_xp;
400	local_process->owner_xp = reference_process_xp;
401	local_process->term_state = 0;
402
403	#if DEBUG_PROCESS_COPY_INIT
404	thread_t * this = CURRENT_THREAD;
405	uint32_t cycle = (uint32_t)hal_get_cycles();
406	if( DEBUG_PROCESS_COPY_INIT < cycle )
407	printk("\n[%s] thread[%x,%x] enter for process %x / cycle %d\n",
408	__FUNCTION__, this->process->pid, this->trdid, local_process->pid, cycle );
409	#endif
410
411	// check user process
412	assert( (local_process->pid != 0), "LPID cannot be 0" );
413
414	// initialize VSL as empty
415	vmm->vsegs_nr = 0;
416	xlist_root_init( XPTR( local_cxy , &vmm->vsegs_root ) );
417
418	// create an empty GPT as required by the architecture
419	error = hal_gpt_create( &vmm->gpt );
420	if( error )
421	{
422	printk("\n[ERROR] in %s : cannot create empty GPT\n", __FUNCTION__ );
423	return -1;
424	}
425
426	// initialize GPT and VSL locks
427	remote_rwlock_init( XPTR( local_cxy , &vmm->vsl_lock ) , LOCK_VMM_VSL );
428
429	// register kernel vsegs in VMM as required by the architecture
430	error = hal_vmm_kernel_update( local_process );
431	if( error )
432	{
433	printk("\n[ERROR] in %s : cannot register kernel vsegs in VMM\n", __FUNCTION__ );
434	return -1;
435	}
436
437	// create "args" and "envs" vsegs
438	// create "stacks" and "mmap" vsegs allocators
439	// initialize locks protecting GPT and VSL
440	error = vmm_user_init( local_process );
441	if( error )
442	{
443	printk("\n[ERROR] in %s : cannot register user vsegs in VMM\n", __FUNCTION__ );
444	return -1;
445	}
446
447	#if (DEBUG_PROCESS_COPY_INIT & 1)
448	cycle = (uint32_t)hal_get_cycles();
449	if( DEBUG_PROCESS_COPY_INIT < cycle )
450	printk("\n[%s] thread[%x,%x] initialized vmm for process %x / cycle %d\n",
451	__FUNCTION__, parent_pid, this->trdid, pid, cycle );
452	#endif
453
454	// set process file descriptors array
455	process_fd_init( local_process );
456
457	// set vfs_root_xp / vfs_bin_xp / cwd_xp fields
458	local_process->vfs_root_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->vfs_root_xp ) );
459	local_process->vfs_bin_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->vfs_bin_xp ) );
460	local_process->cwd_xp = XPTR_NULL;
461
462	// reset children list root (not used in a process descriptor copy)
463	xlist_root_init( XPTR( local_cxy , &local_process->children_root ) );
464	local_process->children_nr = 0;
465	remote_queuelock_init( XPTR( local_cxy , &local_process->children_lock ),
466	LOCK_PROCESS_CHILDREN );
467
468	// reset children_list (not used in a process descriptor copy)
469	xlist_entry_init( XPTR( local_cxy , &local_process->children_list ) );
470
471	// reset semaphores list root (not used in a process descriptor copy)
472	xlist_root_init( XPTR( local_cxy , &local_process->sem_root ) );
473	xlist_root_init( XPTR( local_cxy , &local_process->mutex_root ) );
474	xlist_root_init( XPTR( local_cxy , &local_process->barrier_root ) );
475	xlist_root_init( XPTR( local_cxy , &local_process->condvar_root ) );
476
477	// initialize th_tbl[] array and associated fields
478	uint32_t i;
479	for( i = 0 ; i < CONFIG_THREADS_MAX_PER_CLUSTER ; i++ )
480	{
481	local_process->th_tbl[i] = NULL;
482	}
483	local_process->th_nr = 0;
484	rwlock_init( &local_process->th_lock , LOCK_PROCESS_THTBL );
485
486	// register new process descriptor in local cluster manager local_list
487	cluster_process_local_link( local_process );
488
489	// register new process descriptor in owner cluster manager copies_list
490	cluster_process_copies_link( local_process );
491
492	hal_fence();
493
494	#if DEBUG_PROCESS_COPY_INIT
495	cycle = (uint32_t)hal_get_cycles();
496	if( DEBUG_PROCESS_COPY_INIT < cycle )
497	printk("\n[%s] thread[%x,%x] exit for process %x / cycle %d\n",
498	__FUNCTION__, this->process->pid, this->trdid, local_process->pid, cycle );
499	#endif
500
501	return 0;
502
503	} // end process_copy_init()
504
505	///////////////////////////////////////////
506	void process_destroy( process_t * process )
507	{
508	xptr_t parent_xp;
509	process_t * parent_ptr;
510	cxy_t parent_cxy;
511	xptr_t children_lock_xp;
512	xptr_t children_nr_xp;
513
514	pid_t pid = process->pid;
515
516	// check no more threads
517	assert( (process->th_nr == 0),
518	"process %x in cluster %x contains threads", pid , local_cxy );
519
520	#if DEBUG_PROCESS_DESTROY
521	thread_t * this = CURRENT_THREAD;
522	uint32_t cycle = (uint32_t)hal_get_cycles();
523	if( DEBUG_PROCESS_DESTROY < cycle )
524	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
525	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy, cycle );
526	#endif
527
528	// Destroy VMM
529	vmm_destroy( process );
530
531	#if (DEBUG_PROCESS_DESTROY & 1)
532	if( DEBUG_PROCESS_DESTROY < cycle )
533	printk("\n[%s] thread[%x,%x] destroyed VMM for process %x in cluster %x\n",
534	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy );
535	#endif
536
537	// remove process from local_list in local cluster manager
538	cluster_process_local_unlink( process );
539
540	#if (DEBUG_PROCESS_DESTROY & 1)
541	if( DEBUG_PROCESS_DESTROY < cycle )
542	printk("\n[%s] thread[%x,%x] removed process %x in cluster %x from local list\n",
543	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy );
544	#endif
545
546	// remove process from copies_list in owner cluster manager
547	cluster_process_copies_unlink( process );
548
549	#if (DEBUG_PROCESS_DESTROY & 1)
550	if( DEBUG_PROCESS_DESTROY < cycle )
551	printk("\n[%s] thread[%x,%x] removed process %x in cluster %x from copies list\n",
552	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy );
553	#endif
554
555	// when target process cluster is the owner cluster
556	// - remove process from TXT list and transfer ownership
557	// - remove process from children_list
558	// - release PID
559	if( CXY_FROM_PID( pid ) == local_cxy )
560	{
561	process_txt_detach( XPTR( local_cxy , process ) );
562
563	#if (DEBUG_PROCESS_DESTROY & 1)
564	if( DEBUG_PROCESS_DESTROY < cycle )
565	printk("\n[%s] thread[%x,%x] removed process %x from TXT list\n",
566	__FUNCTION__, this->process->pid, this->trdid, pid );
567	#endif
568
569	// get pointers on parent process
570	parent_xp = process->parent_xp;
571	parent_cxy = GET_CXY( parent_xp );
572	parent_ptr = GET_PTR( parent_xp );
573
574	// get extended pointer on children_lock in parent process
575	children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock );
576	children_nr_xp = XPTR( parent_cxy , &parent_ptr->children_nr );
577
578	// remove process from children_list
579	remote_queuelock_acquire( children_lock_xp );
580	xlist_unlink( XPTR( local_cxy , &process->children_list ) );
581	hal_remote_atomic_add( children_nr_xp , -1 );
582	remote_queuelock_release( children_lock_xp );
583
584	#if (DEBUG_PROCESS_DESTROY & 1)
585	if( DEBUG_PROCESS_DESTROY < cycle )
586	printk("\n[%s] thread[%x,%x] removed process %x from parent process children list\n",
587	__FUNCTION__, this->process->pid, this->trdid, pid );
588	#endif
589
590	// release the process PID to cluster manager
591	cluster_pid_release( pid );
592
593	#if (DEBUG_PROCESS_DESTROY & 1)
594	if( DEBUG_PROCESS_DESTROY < cycle )
595	printk("\n[%s] thread[%x,%x] released process PID %x to pmgr in cluster %x\n",
596	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy );
597	#endif
598
599	}
600
601	// FIXME decrement the refcount on file pointer for vfs_bin_xp [AG]
602
603	// FIXME close all open files [AG]
604
605	// FIXME synchronize dirty files [AG]
606
607	// release memory allocated to process descriptor
608	process_free( process );
609
610	#if DEBUG_PROCESS_DESTROY
611	cycle = (uint32_t)hal_get_cycles();
612	if( DEBUG_PROCESS_DESTROY < cycle )
613	printk("\n[%s] thread[%x,%x] exit / process %x in cluster %x / cycle %d\n",
614	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy, cycle );
615	#endif
616
617	} // end process_destroy()
618
619	///////////////////////////////////////////////////////////////////
620	const char * process_action_str( process_sigactions_t action_type )
621	{
622	switch ( action_type )
623	{
624	case BLOCK_ALL_THREADS: return "BLOCK";
625	case UNBLOCK_ALL_THREADS: return "UNBLOCK";
626	case DELETE_ALL_THREADS: return "DELETE";
627	default: return "undefined";
628	}
629	}
630
631	////////////////////////////////////////
632	void process_sigaction( pid_t pid,
633	uint32_t type )
634	{
635	cxy_t owner_cxy; // owner cluster identifier
636	lpid_t lpid; // process index in owner cluster
637	cluster_t * cluster; // pointer on cluster manager
638	xptr_t root_xp; // extended pointer on root of copies
639	xptr_t lock_xp; // extended pointer on lock protecting copies
640	xptr_t iter_xp; // iterator on copies list
641	xptr_t process_xp; // extended pointer on process copy
642	cxy_t process_cxy; // process copy cluster identifier
643	process_t * process_ptr; // local pointer on process copy
644	reg_t save_sr; // for critical section
645	thread_t * client; // pointer on client thread
646	xptr_t client_xp; // extended pointer on client thread
647	process_t * local; // pointer on process copy in local cluster
648	uint32_t remote_nr; // number of remote process copies
649	rpc_desc_t rpc; // shared RPC descriptor
650	uint32_t responses; // shared RPC responses counter
651
652	client = CURRENT_THREAD;
653	client_xp = XPTR( local_cxy , client );
654	local = NULL;
655	remote_nr = 0;
656
657	// check calling thread can yield
658	thread_assert_can_yield( client , __FUNCTION__ );
659
660	#if DEBUG_PROCESS_SIGACTION
661	uint32_t cycle = (uint32_t)hal_get_cycles();
662	if( DEBUG_PROCESS_SIGACTION < cycle )
663	printk("\n[%s] thread[%x,%x] enter to %s process %x / cycle %d\n",
664	__FUNCTION__ , client->process->pid, client->trdid,
665	process_action_str( type ) , pid , cycle );
666	#endif
667
668	// get pointer on local cluster manager
669	cluster = LOCAL_CLUSTER;
670
671	// get owner cluster identifier and process lpid
672	owner_cxy = CXY_FROM_PID( pid );
673	lpid = LPID_FROM_PID( pid );
674
675	// get root of list of copies and lock from owner cluster
676	root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
677	lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
678
679	// check action type
680	assert( ((type == DELETE_ALL_THREADS ) \|\|
681	(type == BLOCK_ALL_THREADS ) \|\|
682	(type == UNBLOCK_ALL_THREADS )), "illegal action type" );
683
684	// This client thread send parallel RPCs to all remote clusters containing
685	// target process copies, wait all responses, and then handles directly
686	// the threads in local cluster, when required.
687	// The client thread allocates a - shared - RPC descriptor in the stack,
688	// because all parallel, non-blocking, server threads use the same input
689	// arguments, and use the shared RPC response field
690
691	// mask IRQs
692	hal_disable_irq( &save_sr);
693
694	// client thread blocks itself
695	thread_block( client_xp , THREAD_BLOCKED_RPC );
696
697	// initialize RPC responses counter
698	responses = 0;
699
700	// initialize shared RPC descriptor
701	// can be shared, because no out arguments
702	rpc.rsp = &responses;
703	rpc.blocking = false;
704	rpc.index = RPC_PROCESS_SIGACTION;
705	rpc.thread = client;
706	rpc.lid = client->core->lid;
707	rpc.args[0] = pid;
708	rpc.args[1] = type;
709
710	// take the lock protecting process copies
711	remote_queuelock_acquire( lock_xp );
712
713	// scan list of process copies
714	XLIST_FOREACH( root_xp , iter_xp )
715	{
716	// get extended pointers and cluster on process
717	process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list );
718	process_cxy = GET_CXY( process_xp );
719	process_ptr = GET_PTR( process_xp );
720
721	if( process_cxy == local_cxy ) // process copy is local
722	{
723	local = process_ptr;
724	}
725	else // process copy is remote
726	{
727	// update number of remote process copies
728	remote_nr++;
729
730	// atomically increment RPC responses counter
731	hal_atomic_add( &responses , 1 );
732
733	#if DEBUG_PROCESS_SIGACTION
734	if( DEBUG_PROCESS_SIGACTION < cycle )
735	printk("\n[%s] thread[%x,%x] send RPC to cluster %x for process %x\n",
736	__FUNCTION__, client->process->pid, client->trdid, process_cxy, pid );
737	#endif
738	// call RPC in target cluster
739	rpc_send( process_cxy , &rpc );
740	}
741	} // end list of copies
742
743	// release the lock protecting process copies
744	remote_queuelock_release( lock_xp );
745
746	// restore IRQs
747	hal_restore_irq( save_sr);
748
749	// - if there is remote process copies, the client thread deschedules,
750	// (it will be unblocked by the last RPC server thread).
751	// - if there is no remote copies, the client thread unblock itself.
752	if( remote_nr )
753	{
754	sched_yield("blocked on rpc_process_sigaction");
755	}
756	else
757	{
758	thread_unblock( client_xp , THREAD_BLOCKED_RPC );
759	}
760
761	// handle the local process copy if required
762	if( local != NULL )
763	{
764
765	#if DEBUG_PROCESS_SIGACTION
766	if( DEBUG_PROCESS_SIGACTION < cycle )
767	printk("\n[%s] thread[%x,%x] handles local process %x in cluster %x\n",
768	__FUNCTION__, client->process->pid, client->trdid, pid , local_cxy );
769	#endif
770	if (type == DELETE_ALL_THREADS ) process_delete_threads ( local , client_xp );
771	else if(type == BLOCK_ALL_THREADS ) process_block_threads ( local );
772	else if(type == UNBLOCK_ALL_THREADS ) process_unblock_threads( local );
773	}
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 after %s process %x / cycle %d\n",
779	__FUNCTION__, client->process->pid, client->trdid,
780	process_action_str( type ), pid, cycle );
781	#endif
782
783	} // end process_sigaction()
784
785	/////////////////////////////////////////////////
786	void process_block_threads( process_t * process )
787	{
788	thread_t * target; // pointer on target thread
789	thread_t * this; // pointer on calling thread
790	uint32_t ltid; // index in process th_tbl[]
791	uint32_t count; // requests counter
792	volatile uint32_t ack_count; // acknowledges counter
793
794	// get calling thread pointer
795	this = CURRENT_THREAD;
796
797	#if DEBUG_PROCESS_SIGACTION
798	pid_t pid = process->pid;
799	uint32_t cycle = (uint32_t)hal_get_cycles();
800	if( DEBUG_PROCESS_SIGACTION < cycle )
801	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
802	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy , cycle );
803	#endif
804
805	// check target process is an user process
806	assert( (LPID_FROM_PID( process->pid ) != 0 ),
807	"process %x is not an user process\n", process->pid );
808
809	// get lock protecting process th_tbl[]
810	rwlock_rd_acquire( &process->th_lock );
811
812	// loop on target process local threads
813	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
814	// - if the calling thread and the target thread are not running on the same
815	// core, we ask the target scheduler to acknowlege the blocking
816	// to be sure that the target thread is not running.
817	// - if the calling thread and the target thread are running on the same core,
818	// we don't need confirmation from scheduler.
819
820	for( ltid = 0 , count = 0 , ack_count = 0 ; count < process->th_nr ; ltid++ )
821	{
822	target = process->th_tbl[ltid];
823
824	if( target != NULL ) // thread exist
825	{
826	count++;
827
828	// set the global blocked bit in target thread descriptor.
829	thread_block( XPTR( local_cxy , target ) , THREAD_BLOCKED_GLOBAL );
830
831	if( this->core->lid != target->core->lid )
832	{
833	// increment responses counter
834	hal_atomic_add( (void*)&ack_count , 1 );
835
836	// set FLAG_REQ_ACK and &ack_rsp_count in target descriptor
837	thread_set_req_ack( target , (uint32_t *)&ack_count );
838
839	// force scheduling on target thread
840	dev_pic_send_ipi( local_cxy , target->core->lid );
841	}
842	}
843	}
844
845	// release lock protecting process th_tbl[]
846	rwlock_rd_release( &process->th_lock );
847
848	// wait other threads acknowledges TODO this could be improved...
849	while( 1 )
850	{
851	// exit when all scheduler acknowledges received
852	if ( ack_count == 0 ) break;
853
854	// wait 1000 cycles before retry
855	hal_fixed_delay( 1000 );
856	}
857
858	#if DEBUG_PROCESS_SIGACTION
859	cycle = (uint32_t)hal_get_cycles();
860	if( DEBUG_PROCESS_SIGACTION < cycle )
861	printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
862	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy , cycle );
863	#endif
864
865	} // end process_block_threads()
866
867	/////////////////////////////////////////////////
868	void process_delete_threads( process_t * process,
869	xptr_t client_xp )
870	{
871	thread_t * target; // local pointer on target thread
872	xptr_t target_xp; // extended pointer on target thread
873	cxy_t owner_cxy; // owner process cluster
874	uint32_t ltid; // index in process th_tbl
875	uint32_t count; // threads counter
876
877	// get calling thread pointer
878
879	// get target process owner cluster
880	owner_cxy = CXY_FROM_PID( process->pid );
881
882	#if DEBUG_PROCESS_SIGACTION
883	thread_t * this = CURRENT_THREAD;
884	uint32_t cycle = (uint32_t)hal_get_cycles();
885	if( DEBUG_PROCESS_SIGACTION < cycle )
886	printk("\n[%s] thread[%x,%x] enter for process %x n cluster %x / cycle %d\n",
887	__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy, cycle );
888	#endif
889
890	// check target process is an user process
891	assert( (LPID_FROM_PID( process->pid ) != 0),
892	"process %x is not an user process\n", process->pid );
893
894	// get lock protecting process th_tbl[]
895	rwlock_wr_acquire( &process->th_lock );
896
897	// loop on target process local threads
898	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
899	for( ltid = 0 , count = 0 ; count < process->th_nr ; ltid++ )
900	{
901	target = process->th_tbl[ltid];
902
903	if( target != NULL ) // valid thread
904	{
905	count++;
906	target_xp = XPTR( local_cxy , target );
907
908	// main thread and client thread should not be deleted
909	if( ((ltid != 0) \|\| (owner_cxy != local_cxy)) && // not main thread
910	(client_xp) != target_xp ) // not client thread
911	{
912	// mark target thread for delete and block it
913	thread_delete( target_xp , process->pid , false ); // not forced
914	}
915	}
916	}
917
918	// release lock protecting process th_tbl[]
919	rwlock_wr_release( &process->th_lock );
920
921	#if DEBUG_PROCESS_SIGACTION
922	cycle = (uint32_t)hal_get_cycles();
923	if( DEBUG_PROCESS_SIGACTION < cycle )
924	printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
925	__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy , cycle );
926	#endif
927
928	} // end process_delete_threads()
929
930	///////////////////////////////////////////////////
931	void process_unblock_threads( process_t * process )
932	{
933	thread_t * target; // pointer on target thead
934	uint32_t ltid; // index in process th_tbl
935	uint32_t count; // requests counter
936
937	#if DEBUG_PROCESS_SIGACTION
938	thread_t * this = CURRENT_THREAD;
939	pid_t pid = process->pid;
940	uint32_t cycle = (uint32_t)hal_get_cycles();
941	if( DEBUG_PROCESS_SIGACTION < cycle )
942	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
943	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy , cycle );
944	#endif
945
946	// check target process is an user process
947	assert( ( LPID_FROM_PID( process->pid ) != 0 ),
948	"process %x is not an user process\n", process->pid );
949
950	// get lock protecting process th_tbl[]
951	rwlock_rd_acquire( &process->th_lock );
952
953	// loop on process threads to unblock all threads
954	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
955	for( ltid = 0 , count = 0 ; count < process->th_nr ; ltid++ )
956	{
957	target = process->th_tbl[ltid];
958
959	if( target != NULL ) // thread found
960	{
961	count++;
962
963	// reset the global blocked bit in target thread descriptor.
964	thread_unblock( XPTR( local_cxy , target ) , THREAD_BLOCKED_GLOBAL );
965	}
966	}
967
968	// release lock protecting process th_tbl[]
969	rwlock_rd_release( &process->th_lock );
970
971	#if DEBUG_PROCESS_SIGACTION
972	cycle = (uint32_t)hal_get_cycles();
973	if( DEBUG_PROCESS_SIGACTION < cycle )
974	printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
975	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy, cycle );
976	#endif
977
978	} // end process_unblock_threads()
979
980	///////////////////////////////////////////////
981	process_t * process_get_local_copy( pid_t pid )
982	{
983	error_t error;
984	process_t * process_ptr; // local pointer on process
985	xptr_t process_xp; // extended pointer on process
986
987	cluster_t * cluster = LOCAL_CLUSTER;
988
989	#if DEBUG_PROCESS_GET_LOCAL_COPY
990	thread_t * this = CURRENT_THREAD;
991	uint32_t cycle = (uint32_t)hal_get_cycles();
992	if( DEBUG_PROCESS_GET_LOCAL_COPY < cycle )
993	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
994	__FUNCTION__, this->process->pid, this->trdid, pid, local_cxy, cycle );
995	#endif
996
997	// get lock protecting local list of processes
998	remote_queuelock_acquire( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
999
1000	// scan the local list of process descriptors to find the process
1001	xptr_t iter;
1002	bool_t found = false;
1003	XLIST_FOREACH( XPTR( local_cxy , &cluster->pmgr.local_root ) , iter )
1004	{
1005	process_xp = XLIST_ELEMENT( iter , process_t , local_list );
1006	process_ptr = GET_PTR( process_xp );
1007	if( process_ptr->pid == pid )
1008	{
1009	found = true;
1010	break;
1011	}
1012	}
1013
1014	// release lock protecting local list of processes
1015	remote_queuelock_release( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
1016
1017	// allocate memory for a new local process descriptor
1018	// and initialise it from reference cluster if not found
1019	if( !found )
1020	{
1021	// get extended pointer on reference process descriptor
1022	xptr_t ref_xp = cluster_get_reference_process_from_pid( pid );
1023
1024	assert( (ref_xp != XPTR_NULL) , "illegal pid\n" );
1025
1026	// allocate memory for local process descriptor
1027	process_ptr = process_alloc();
1028
1029	if( process_ptr == NULL ) return NULL;
1030
1031	// initialize local process descriptor copy
1032	error = process_copy_init( process_ptr , ref_xp );
1033
1034	if( error ) return NULL;
1035	}
1036
1037	#if DEBUG_PROCESS_GET_LOCAL_COPY
1038	cycle = (uint32_t)hal_get_cycles();
1039	if( DEBUG_PROCESS_GET_LOCAL_COPY < cycle )
1040	printk("\n[%s] thread[%x,%x] exit in cluster %x / process %x / cycle %d\n",
1041	__FUNCTION__, this->process->pid, this->trdid, local_cxy, process_ptr, cycle );
1042	#endif
1043
1044	return process_ptr;
1045
1046	} // end process_get_local_copy()
1047
1048	////////////////////////////////////////////
1049	pid_t process_get_ppid( xptr_t process_xp )
1050	{
1051	cxy_t process_cxy;
1052	process_t * process_ptr;
1053	xptr_t parent_xp;
1054	cxy_t parent_cxy;
1055	process_t * parent_ptr;
1056
1057	// get process cluster and local pointer
1058	process_cxy = GET_CXY( process_xp );
1059	process_ptr = GET_PTR( process_xp );
1060
1061	// get pointers on parent process
1062	parent_xp = (xptr_t)hal_remote_l64( XPTR( process_cxy , &process_ptr->parent_xp ) );
1063	parent_cxy = GET_CXY( parent_xp );
1064	parent_ptr = GET_PTR( parent_xp );
1065
1066	return hal_remote_l32( XPTR( parent_cxy , &parent_ptr->pid ) );
1067	}
1068
1069	//////////////////////////////////////////////////////////////////////////////////////////
1070	// File descriptor array related functions
1071	//////////////////////////////////////////////////////////////////////////////////////////
1072
1073	///////////////////////////////////////////
1074	void process_fd_init( process_t * process )
1075	{
1076	uint32_t fd;
1077
1078	// initialize lock
1079	remote_queuelock_init( XPTR( local_cxy , &process->fd_array.lock ), LOCK_PROCESS_FDARRAY );
1080
1081	// initialize number of open files
1082	process->fd_array.current = 0;
1083
1084	// initialize array
1085	for ( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
1086	{
1087	process->fd_array.array[fd] = XPTR_NULL;
1088	}
1089	}
1090	////////////////////////////////////////////////////
1091	error_t process_fd_register( xptr_t process_xp,
1092	xptr_t file_xp,
1093	uint32_t * fdid )
1094	{
1095	bool_t found;
1096	uint32_t id;
1097	xptr_t xp;
1098
1099	// get reference process cluster and local pointer
1100	process_t * process_ptr = GET_PTR( process_xp );
1101	cxy_t process_cxy = GET_CXY( process_xp );
1102
1103	// check client process is reference process
1104	assert( (process_xp == hal_remote_l64( XPTR( process_cxy , &process_ptr->ref_xp ) ) ),
1105	"client process must be reference process\n" );
1106
1107	#if DEBUG_PROCESS_FD_REGISTER
1108	thread_t * this = CURRENT_THREAD;
1109	uint32_t cycle = (uint32_t)hal_get_cycles();
1110	pid_t pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid) );
1111	if( DEBUG_PROCESS_FD_REGISTER < cycle )
1112	printk("\n[%s] thread[%x,%x] enter for process %x / cycle %d\n",
1113	__FUNCTION__, this->process->pid, this->trdid, pid, cycle );
1114	#endif
1115
1116	// build extended pointer on lock protecting reference fd_array
1117	xptr_t lock_xp = XPTR( process_cxy , &process_ptr->fd_array.lock );
1118
1119	// take lock protecting reference fd_array
1120	remote_queuelock_acquire( lock_xp );
1121
1122	found = false;
1123
1124	for ( id = 0; id < CONFIG_PROCESS_FILE_MAX_NR ; id++ )
1125	{
1126	xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->fd_array.array[id] ) );
1127	if ( xp == XPTR_NULL )
1128	{
1129	// update reference fd_array
1130	hal_remote_s64( XPTR( process_cxy , &process_ptr->fd_array.array[id] ) , file_xp );
1131	hal_remote_atomic_add( XPTR( process_cxy , &process_ptr->fd_array.current ) , 1 );
1132
1133	// exit
1134	*fdid = id;
1135	found = true;
1136	break;
1137	}
1138	}
1139
1140	// release lock protecting fd_array
1141	remote_queuelock_release( lock_xp );
1142
1143	#if DEBUG_PROCESS_FD_REGISTER
1144	cycle = (uint32_t)hal_get_cycles();
1145	if( DEBUG_PROCESS_FD_REGISTER < cycle )
1146	printk("\n[%s] thread[%x,%x] exit for process %x / fdid %d / cycle %d\n",
1147	__FUNCTION__, this->process->pid, this->trdid, pid, id, cycle );
1148	#endif
1149
1150	if ( !found ) return -1;
1151	else return 0;
1152
1153	} // end process_fd_register()
1154
1155	////////////////////////////////////////////////
1156	xptr_t process_fd_get_xptr( process_t * process,
1157	uint32_t fdid )
1158	{
1159	xptr_t file_xp;
1160	xptr_t lock_xp;
1161
1162	// access local copy of process descriptor
1163	file_xp = process->fd_array.array[fdid];
1164
1165	if( file_xp == XPTR_NULL )
1166	{
1167	// get reference process cluster and local pointer
1168	xptr_t ref_xp = process->ref_xp;
1169	cxy_t ref_cxy = GET_CXY( ref_xp );
1170	process_t * ref_ptr = GET_PTR( ref_xp );
1171
1172	// build extended pointer on lock protecting reference fd_array
1173	lock_xp = XPTR( ref_cxy , &ref_ptr->fd_array.lock );
1174
1175	// take lock protecting reference fd_array
1176	remote_queuelock_acquire( lock_xp );
1177
1178	// access reference process descriptor
1179	file_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->fd_array.array[fdid] ) );
1180
1181	// update local fd_array if found
1182	if( file_xp != XPTR_NULL ) process->fd_array.array[fdid] = file_xp;
1183
1184	// release lock protecting reference fd_array
1185	remote_queuelock_release( lock_xp );
1186	}
1187
1188	return file_xp;
1189
1190	} // end process_fd_get_xptr()
1191
1192	///////////////////////////////////////////
1193	void process_fd_remote_copy( xptr_t dst_xp,
1194	xptr_t src_xp )
1195	{
1196	uint32_t fd;
1197	xptr_t entry;
1198
1199	// get cluster and local pointer for src fd_array
1200	cxy_t src_cxy = GET_CXY( src_xp );
1201	fd_array_t * src_ptr = GET_PTR( src_xp );
1202
1203	// get cluster and local pointer for dst fd_array
1204	cxy_t dst_cxy = GET_CXY( dst_xp );
1205	fd_array_t * dst_ptr = GET_PTR( dst_xp );
1206
1207	// get the remote lock protecting the src fd_array
1208	remote_queuelock_acquire( XPTR( src_cxy , &src_ptr->lock ) );
1209
1210	// loop on all fd_array entries
1211	for( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
1212	{
1213	entry = (xptr_t)hal_remote_l64( XPTR( src_cxy , &src_ptr->array[fd] ) );
1214
1215	if( entry != XPTR_NULL )
1216	{
1217	// increment file descriptor refcount
1218	vfs_file_count_up( entry );
1219
1220	// copy entry in destination process fd_array
1221	hal_remote_s64( XPTR( dst_cxy , &dst_ptr->array[fd] ) , entry );
1222	}
1223	}
1224
1225	// release lock on source process fd_array
1226	remote_queuelock_release( XPTR( src_cxy , &src_ptr->lock ) );
1227
1228	} // end process_fd_remote_copy()
1229
1230
1231	////////////////////////////////////
1232	bool_t process_fd_array_full( void )
1233	{
1234	// get extended pointer on reference process
1235	xptr_t ref_xp = CURRENT_THREAD->process->ref_xp;
1236
1237	// get reference process cluster and local pointer
1238	process_t * ref_ptr = GET_PTR( ref_xp );
1239	cxy_t ref_cxy = GET_CXY( ref_xp );
1240
1241	// get number of open file descriptors from reference fd_array
1242	uint32_t current = hal_remote_l32( XPTR( ref_cxy , &ref_ptr->fd_array.current ) );
1243
1244	return ( current >= CONFIG_PROCESS_FILE_MAX_NR );
1245	}
1246
1247
1248	////////////////////////////////////////////////////////////////////////////////////
1249	// Thread related functions
1250	////////////////////////////////////////////////////////////////////////////////////
1251
1252	/////////////////////////////////////////////////////
1253	error_t process_register_thread( process_t * process,
1254	thread_t * thread,
1255	trdid_t * trdid )
1256	{
1257	ltid_t ltid;
1258	bool_t found = false;
1259
1260	// check arguments
1261	assert( (process != NULL) , "process argument is NULL" );
1262	assert( (thread != NULL) , "thread argument is NULL" );
1263
1264	// get the lock protecting th_tbl for all threads
1265	// but the idle thread executing kernel_init (cannot yield)
1266	if( thread->type != THREAD_IDLE ) rwlock_wr_acquire( &process->th_lock );
1267
1268	// scan th_tbl
1269	for( ltid = 0 ; ltid < CONFIG_THREADS_MAX_PER_CLUSTER ; ltid++ )
1270	{
1271	if( process->th_tbl[ltid] == NULL )
1272	{
1273	found = true;
1274	break;
1275	}
1276	}
1277
1278	if( found )
1279	{
1280	// register thread in th_tbl[]
1281	process->th_tbl[ltid] = thread;
1282	process->th_nr++;
1283
1284	// returns trdid
1285	*trdid = TRDID( local_cxy , ltid );
1286	}
1287
1288	// release the lock protecting th_tbl
1289	if( thread->type != THREAD_IDLE ) rwlock_wr_release( &process->th_lock );
1290
1291	return (found) ? 0 : 0xFFFFFFFF;
1292
1293	} // end process_register_thread()
1294
1295	///////////////////////////////////////////////////
1296	uint32_t process_remove_thread( thread_t * thread )
1297	{
1298	uint32_t count; // number of threads in local process descriptor
1299
1300	// check thread
1301	assert( (thread != NULL) , "thread argument is NULL" );
1302
1303	process_t * process = thread->process;
1304
1305	// get thread local index
1306	ltid_t ltid = LTID_FROM_TRDID( thread->trdid );
1307
1308	// get the lock protecting th_tbl[]
1309	rwlock_wr_acquire( &process->th_lock );
1310
1311	// get number of threads
1312	count = process->th_nr;
1313
1314	// check th_nr value
1315	assert( (count > 0) , "process th_nr cannot be 0" );
1316
1317	// remove thread from th_tbl[]
1318	process->th_tbl[ltid] = NULL;
1319	process->th_nr = count-1;
1320
1321	// release lock protecting th_tbl
1322	rwlock_wr_release( &process->th_lock );
1323
1324	return count;
1325
1326	} // end process_remove_thread()
1327
1328	/////////////////////////////////////////////////////////
1329	error_t process_make_fork( xptr_t parent_process_xp,
1330	xptr_t parent_thread_xp,
1331	pid_t * child_pid,
1332	thread_t ** child_thread )
1333	{
1334	process_t * process; // local pointer on child process descriptor
1335	thread_t * thread; // local pointer on child thread descriptor
1336	pid_t new_pid; // process identifier for child process
1337	pid_t parent_pid; // process identifier for parent process
1338	xptr_t ref_xp; // extended pointer on reference process
1339	xptr_t vfs_bin_xp; // extended pointer on .elf file
1340	error_t error;
1341
1342	// get cluster and local pointer for parent process
1343	cxy_t parent_process_cxy = GET_CXY( parent_process_xp );
1344	process_t * parent_process_ptr = GET_PTR( parent_process_xp );
1345
1346	// get parent process PID and extended pointer on .elf file
1347	parent_pid = hal_remote_l32 (XPTR( parent_process_cxy , &parent_process_ptr->pid));
1348	vfs_bin_xp = hal_remote_l64(XPTR( parent_process_cxy , &parent_process_ptr->vfs_bin_xp));
1349
1350	// get extended pointer on reference process
1351	ref_xp = hal_remote_l64( XPTR( parent_process_cxy , &parent_process_ptr->ref_xp ) );
1352
1353	// check parent process is the reference process
1354	assert( (parent_process_xp == ref_xp ) ,
1355	"parent process must be the reference process" );
1356
1357	#if DEBUG_PROCESS_MAKE_FORK
1358	uint32_t cycle = (uint32_t)hal_get_cycles();
1359	thread_t * this = CURRENT_THREAD;
1360	trdid_t trdid = this->trdid;
1361	pid_t pid = this->process->pid;
1362	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1363	printk("\n[%s] thread[%x,%x] enter / cluster %x / cycle %d\n",
1364	__FUNCTION__, pid, trdid, local_cxy, cycle );
1365	#endif
1366
1367	// allocate a process descriptor
1368	process = process_alloc();
1369	if( process == NULL )
1370	{
1371	printk("\n[ERROR] in %s : cannot get process in cluster %x\n",
1372	__FUNCTION__, local_cxy );
1373	return -1;
1374	}
1375
1376	// allocate a child PID from local cluster
1377	error = cluster_pid_alloc( process , &new_pid );
1378	if( error )
1379	{
1380	printk("\n[ERROR] in %s : cannot get PID in cluster %x\n",
1381	__FUNCTION__, local_cxy );
1382	process_free( process );
1383	return -1;
1384	}
1385
1386	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1387	cycle = (uint32_t)hal_get_cycles();
1388	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1389	printk("\n[%s] thread[%x,%x] allocated child_process %x / cycle %d\n",
1390	__FUNCTION__, pid, trdid, new_pid, cycle );
1391	#endif
1392
1393	// initializes child process descriptor from parent process descriptor
1394	error = process_reference_init( process,
1395	new_pid,
1396	parent_process_xp );
1397	if( error )
1398	{
1399	printk("\n[ERROR] in %s : cannot initialize child process in cluster %x\n",
1400	__FUNCTION__, local_cxy );
1401	process_free( process );
1402	return -1;
1403	}
1404
1405	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1406	cycle = (uint32_t)hal_get_cycles();
1407	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1408	printk("\n[%s] thread[%x,%x] initialized child_process %x / cycle %d\n",
1409	__FUNCTION__, pid, trdid, new_pid, cycle );
1410	#endif
1411
1412	// copy VMM from parent descriptor to child descriptor
1413	error = vmm_fork_copy( process,
1414	parent_process_xp );
1415	if( error )
1416	{
1417	printk("\n[ERROR] in %s : cannot copy VMM in cluster %x\n",
1418	__FUNCTION__, local_cxy );
1419	process_free( process );
1420	cluster_pid_release( new_pid );
1421	return -1;
1422	}
1423
1424	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1425	cycle = (uint32_t)hal_get_cycles();
1426	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1427	printk("\n[%s] thread[%x,%x] copied VMM from parent to child / cycle %d\n",
1428	__FUNCTION__, pid, trdid, cycle );
1429	#endif
1430
1431	// if parent_process is INIT, or if parent_process is the TXT owner,
1432	// the child_process becomes the owner of its TXT terminal
1433	if( (parent_pid == 1) \|\| process_txt_is_owner( parent_process_xp ) )
1434	{
1435	process_txt_set_ownership( XPTR( local_cxy , process ) );
1436
1437	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1438	cycle = (uint32_t)hal_get_cycles();
1439	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1440	printk("\n[%s] thread[%x,%x] / child takes TXT ownership / cycle %d\n",
1441	__FUNCTION__ , pid, trdid, cycle );
1442	#endif
1443
1444	}
1445
1446	// update extended pointer on .elf file
1447	process->vfs_bin_xp = vfs_bin_xp;
1448
1449	// create child thread descriptor from parent thread descriptor
1450	error = thread_user_fork( parent_thread_xp,
1451	process,
1452	&thread );
1453	if( error )
1454	{
1455	printk("\n[ERROR] in %s : cannot create thread in cluster %x\n",
1456	__FUNCTION__, local_cxy );
1457	process_free( process );
1458	cluster_pid_release( new_pid );
1459	return -1;
1460	}
1461
1462	// check main thread LTID
1463	assert( (LTID_FROM_TRDID(thread->trdid) == 0) ,
1464	"main thread must have LTID == 0" );
1465
1466	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1467	cycle = (uint32_t)hal_get_cycles();
1468	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1469	printk("\n[%s] thread[%x,%x] created main thread %x / cycle %d\n",
1470	__FUNCTION__, pid, trdid, thread, cycle );
1471	#endif
1472
1473	// set COW flag in DATA, ANON, REMOTE vsegs for parent process VMM
1474	// this includes all parent process copies in all clusters
1475	if( parent_process_cxy == local_cxy ) // reference is local
1476	{
1477	vmm_set_cow( parent_process_ptr );
1478	}
1479	else // reference is remote
1480	{
1481	rpc_vmm_set_cow_client( parent_process_cxy,
1482	parent_process_ptr );
1483	}
1484
1485	// set COW flag in DATA, ANON, REMOTE vsegs for child process VMM
1486	vmm_set_cow( process );
1487
1488	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1489	cycle = (uint32_t)hal_get_cycles();
1490	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1491	printk("\n[%s] thread[%x,%x] set COW in parent and child / cycle %d\n",
1492	__FUNCTION__, pid, trdid, cycle );
1493	#endif
1494
1495	// get extended pointers on parent children_root, children_lock and children_nr
1496	xptr_t children_root_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_root );
1497	xptr_t children_lock_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_lock );
1498	xptr_t children_nr_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_nr );
1499
1500	// register process in parent children list
1501	remote_queuelock_acquire( children_lock_xp );
1502	xlist_add_last( children_root_xp , XPTR( local_cxy , &process->children_list ) );
1503	hal_remote_atomic_add( children_nr_xp , 1 );
1504	remote_queuelock_release( children_lock_xp );
1505
1506	// return success
1507	*child_thread = thread;
1508	*child_pid = new_pid;
1509
1510	#if DEBUG_PROCESS_MAKE_FORK
1511	cycle = (uint32_t)hal_get_cycles();
1512	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1513	printk("\n[%s] thread[%x,%x] exit / created process %x / cycle %d\n",
1514	__FUNCTION__, pid, trdid, new_pid, cycle );
1515	#endif
1516
1517	return 0;
1518
1519	} // end process_make_fork()
1520
1521	/////////////////////////////////////////////////////
1522	error_t process_make_exec( exec_info_t * exec_info )
1523	{
1524	thread_t * thread; // local pointer on this thread
1525	process_t * process; // local pointer on this process
1526	pid_t pid; // this process identifier
1527	xptr_t ref_xp; // reference process for this process
1528	error_t error; // value returned by called functions
1529	char * path; // path to .elf file
1530	xptr_t file_xp; // extended pointer on .elf file descriptor
1531	uint32_t file_id; // file index in fd_array
1532	uint32_t args_nr; // number of main thread arguments
1533	char ** args_pointers; // array of pointers on main thread arguments
1534
1535	// get calling thread, process, pid and ref_xp
1536	thread = CURRENT_THREAD;
1537	process = thread->process;
1538	pid = process->pid;
1539	ref_xp = process->ref_xp;
1540
1541	// get relevant infos from exec_info
1542	path = exec_info->path;
1543	args_nr = exec_info->args_nr;
1544	args_pointers = exec_info->args_pointers;
1545
1546	#if DEBUG_PROCESS_MAKE_EXEC
1547	uint32_t cycle = (uint32_t)hal_get_cycles();
1548	if( local_cxy == 0x11 )
1549	printk("\n[%s] thread[%x,%x] enters for %s / cycle %d\n",
1550	__FUNCTION__, pid, thread->trdid, path, cycle );
1551	#endif
1552
1553	// open the file identified by <path>
1554	file_xp = XPTR_NULL;
1555	file_id = 0xFFFFFFFF;
1556	error = vfs_open( process->vfs_root_xp,
1557	path,
1558	ref_xp,
1559	O_RDONLY,
1560	0,
1561	&file_xp,
1562	&file_id );
1563	if( error )
1564	{
1565	printk("\n[ERROR] in %s : failed to open file <%s>\n", __FUNCTION__ , path );
1566	return -1;
1567	}
1568
1569	#if (DEBUG_PROCESS_MAKE_EXEC & 1)
1570	cycle = (uint32_t)hal_get_cycles();
1571	if( local_cxy == 0x11 )
1572	printk("\n[%s] thread[%x,%x] opened file <%s> / cycle %d\n",
1573	__FUNCTION__, pid, thread->trdid, path, cycle );
1574	#endif
1575
1576	// delete all threads other than this main thread in all clusters
1577	process_sigaction( pid , DELETE_ALL_THREADS );
1578
1579	#if (DEBUG_PROCESS_MAKE_EXEC & 1)
1580	cycle = (uint32_t)hal_get_cycles();
1581	if( local_cxy == 0x11 )
1582	printk("\n[%s] thread[%x,%x] deleted existing threads / cycle %d\n",
1583	__FUNCTION__, pid, thread->trdid, cycle );
1584	#endif
1585
1586	// reset calling process VMM
1587	vmm_user_reset( process );
1588
1589	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1590	cycle = (uint32_t)hal_get_cycles();
1591	if( local_cxy == 0x11 )
1592	printk("\n[%s] thread[%x,%x] completed VMM reset / cycle %d\n",
1593	__FUNCTION__, pid, thread->trdid, cycle );
1594	#endif
1595
1596	// re-initialize the VMM (args/envs vsegs registration)
1597	error = vmm_user_init( process );
1598	if( error )
1599	{
1600	printk("\n[ERROR] in %s : cannot initialise VMM for %s\n", __FUNCTION__ , path );
1601	vfs_close( file_xp , file_id );
1602	// FIXME restore old process VMM [AG]
1603	return -1;
1604	}
1605
1606	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1607	cycle = (uint32_t)hal_get_cycles();
1608	if( local_cxy == 0x11 )
1609	printk("\n[%s] thread[%x,%x] registered args/envs vsegs / cycle %d\n",
1610	__FUNCTION__, pid, thread->trdid, cycle );
1611	#endif
1612
1613	// register code & data vsegs as well as entry-point in process VMM,
1614	// and register extended pointer on .elf file in process descriptor
1615	error = elf_load_process( file_xp , process );
1616	if( error )
1617	{
1618	printk("\n[ERROR] in %s : failed to access <%s>\n", __FUNCTION__ , path );
1619	vfs_close( file_xp , file_id );
1620	// FIXME restore old process VMM [AG]
1621	return -1;
1622	}
1623
1624	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1625	cycle = (uint32_t)hal_get_cycles();
1626	if( local_cxy == 0x11 )
1627	printk("\n[%s] thread[%x,%x] registered code/data vsegs / cycle %d\n",
1628	__FUNCTION__, pid, thread->trdid, cycle );
1629	#endif
1630
1631	// update the existing main thread descriptor... and jump to user code
1632	error = thread_user_exec( (void *)process->vmm.entry_point,
1633	args_nr,
1634	args_pointers );
1635	if( error )
1636	{
1637	printk("\n[ERROR] in %s : cannot update main thread for %s\n", __FUNCTION__ , path );
1638	vfs_close( file_xp , file_id );
1639	// FIXME restore old process VMM
1640	return -1;
1641	}
1642
1643	assert( false, "we should not execute this code");
1644
1645	return 0;
1646
1647	} // end process_make_exec()
1648
1649
1650	////////////////////////////////////////////////
1651	void process_zero_create( process_t * process,
1652	boot_info_t * info )
1653	{
1654	error_t error;
1655	pid_t pid;
1656
1657	#if DEBUG_PROCESS_ZERO_CREATE
1658	uint32_t cycle = (uint32_t)hal_get_cycles();
1659	if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1660	printk("\n[%s] enter / cluster %x / cycle %d\n",
1661	__FUNCTION__, local_cxy, cycle );
1662	#endif
1663
1664	// get pointer on VMM
1665	vmm_t * vmm = &process->vmm;
1666
1667	// get PID from local cluster manager for this kernel process
1668	error = cluster_pid_alloc( process , &pid );
1669
1670	if( error \|\| (LPID_FROM_PID( pid ) != 0) )
1671	{
1672	printk("\n[PANIC] in %s : cannot get valid PID in cluster %x / PID = %x\n",
1673	__FUNCTION__ , local_cxy, pid );
1674	hal_core_sleep();
1675	}
1676
1677	// initialize PID, REF_XP, PARENT_XP, and STATE
1678	// the kernel process_zero is its own parent_process,
1679	// reference_process, and owner_process, and cannot be killed...
1680	process->pid = pid;
1681	process->ref_xp = XPTR( local_cxy , process );
1682	process->owner_xp = XPTR( local_cxy , process );
1683	process->parent_xp = XPTR( local_cxy , process );
1684	process->term_state = 0;
1685
1686	// initilise VSL as empty
1687	vmm->vsegs_nr = 0;
1688	xlist_root_init( XPTR( local_cxy , &vmm->vsegs_root ) );
1689
1690	// initialise GPT as empty
1691	error = hal_gpt_create( &vmm->gpt );
1692	if( error )
1693	{
1694	printk("\n[PANIC] in %s : cannot create empty GPT\n", __FUNCTION__ );
1695	hal_core_sleep();
1696	}
1697
1698	// initialize VSL and GPT locks
1699	remote_rwlock_init( XPTR( local_cxy , &vmm->vsl_lock ) , LOCK_VMM_VSL );
1700
1701	// create kernel vsegs in GPT and VSL, as required by the hardware architecture
1702	error = hal_vmm_kernel_init( info );
1703	if( error )
1704	{
1705	printk("\n[PANIC] in %s : cannot create kernel vsegs in VMM\n", __FUNCTION__ );
1706	hal_core_sleep();
1707	}
1708
1709	// reset th_tbl[] array and associated fields
1710	uint32_t i;
1711	for( i = 0 ; i < CONFIG_THREADS_MAX_PER_CLUSTER ; i++ )
1712	{
1713	process->th_tbl[i] = NULL;
1714	}
1715	process->th_nr = 0;
1716	rwlock_init( &process->th_lock , LOCK_PROCESS_THTBL );
1717
1718
1719	// reset children list as empty
1720	xlist_root_init( XPTR( local_cxy , &process->children_root ) );
1721	process->children_nr = 0;
1722	remote_queuelock_init( XPTR( local_cxy , &process->children_lock ),
1723	LOCK_PROCESS_CHILDREN );
1724
1725	// register kernel process in cluster manager local_list
1726	cluster_process_local_link( process );
1727
1728	hal_fence();
1729
1730	#if DEBUG_PROCESS_ZERO_CREATE
1731	cycle = (uint32_t)hal_get_cycles();
1732	if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1733	printk("\n[%s] exit / cluster %x / cycle %d\n",
1734	__FUNCTION__, local_cxy, cycle );
1735	#endif
1736
1737	} // end process_zero_create()
1738
1739	////////////////////////////////
1740	void process_init_create( void )
1741	{
1742	process_t * process; // local pointer on process descriptor
1743	pid_t pid; // process_init identifier
1744	thread_t * thread; // local pointer on main thread
1745	pthread_attr_t attr; // main thread attributes
1746	lid_t lid; // selected core local index for main thread
1747	xptr_t file_xp; // extended pointer on .elf file descriptor
1748	uint32_t file_id; // file index in fd_array
1749	error_t error;
1750
1751	#if DEBUG_PROCESS_INIT_CREATE
1752	thread_t * this = CURRENT_THREAD;
1753	uint32_t cycle = (uint32_t)hal_get_cycles();
1754	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1755	printk("\n[%s] thread[%x,%x] enter / cycle %d\n",
1756	__FUNCTION__, this->process->pid, this->trdid, cycle );
1757	#endif
1758
1759	// allocates memory for process descriptor from local cluster
1760	process = process_alloc();
1761	if( process == NULL )
1762	{
1763	printk("\n[PANIC] in %s : cannot allocate process\n", __FUNCTION__ );
1764	hal_core_sleep();
1765	}
1766
1767	// set the CWD and VFS_ROOT fields in process descriptor
1768	process->cwd_xp = process_zero.vfs_root_xp;
1769	process->vfs_root_xp = process_zero.vfs_root_xp;
1770
1771	// get PID from local cluster
1772	error = cluster_pid_alloc( process , &pid );
1773	if( error )
1774	{
1775	printk("\n[PANIC] in %s : cannot allocate PID\n", __FUNCTION__ );
1776	hal_core_sleep();
1777	}
1778	if( pid != 1 )
1779	{
1780	printk("\n[PANIC] in %s : process PID must be 0x1\n", __FUNCTION__ );
1781	hal_core_sleep();
1782	}
1783
1784	// initialize process descriptor / parent is local process_zero
1785	error = process_reference_init( process,
1786	pid,
1787	XPTR( local_cxy , &process_zero ) );
1788	if( error )
1789	{
1790	printk("\n[PANIC] in %s : cannot initialize process\n", __FUNCTION__ );
1791	hal_core_sleep();
1792	}
1793
1794	#if(DEBUG_PROCESS_INIT_CREATE & 1)
1795	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1796	printk("\n[%s] thread[%x,%x] initialized process descriptor\n",
1797	__FUNCTION__, this->process->pid, this->trdid );
1798	#endif
1799
1800	// open the file identified by CONFIG_PROCESS_INIT_PATH
1801	file_xp = XPTR_NULL;
1802	file_id = -1;
1803	error = vfs_open( process->vfs_root_xp,
1804	CONFIG_PROCESS_INIT_PATH,
1805	XPTR( local_cxy , process ),
1806	O_RDONLY,
1807	0,
1808	&file_xp,
1809	&file_id );
1810	if( error )
1811	{
1812	printk("\n[PANIC] in %s : cannot open file <%s>\n",
1813	__FUNCTION__, CONFIG_PROCESS_INIT_PATH );
1814	hal_core_sleep();
1815	}
1816
1817	#if(DEBUG_PROCESS_INIT_CREATE & 1)
1818	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1819	printk("\n[%s] thread[%x,%x] open .elf file decriptor\n",
1820	__FUNCTION__, this->process->pid, this->trdid );
1821	#endif
1822
1823	// register "code" and "data" vsegs as well as entry-point
1824	// in process VMM, using information contained in the elf file.
1825	error = elf_load_process( file_xp , process );
1826
1827	if( error )
1828	{
1829	printk("\n[PANIC] in %s : cannot access file <%s>\n",
1830	__FUNCTION__, CONFIG_PROCESS_INIT_PATH );
1831	hal_core_sleep();
1832	}
1833
1834
1835	#if(DEBUG_PROCESS_INIT_CREATE & 1)
1836	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1837	printk("\n[%s] thread[%x,%x] registered code/data vsegs in VMM\n",
1838	__FUNCTION__, this->process->pid, this->trdid );
1839	#endif
1840
1841	#if (DEBUG_PROCESS_INIT_CREATE & 1)
1842	hal_vmm_display( process , true );
1843	#endif
1844
1845	// get extended pointers on process_zero children_root, children_lock
1846	xptr_t children_root_xp = XPTR( local_cxy , &process_zero.children_root );
1847	xptr_t children_lock_xp = XPTR( local_cxy , &process_zero.children_lock );
1848
1849	// take lock protecting kernel process children list
1850	remote_queuelock_acquire( children_lock_xp );
1851
1852	// register process INIT in parent local process_zero
1853	xlist_add_last( children_root_xp , XPTR( local_cxy , &process->children_list ) );
1854	hal_atomic_add( &process_zero.children_nr , 1 );
1855
1856	// release lock protecting kernel process children list
1857	remote_queuelock_release( children_lock_xp );
1858
1859	#if(DEBUG_PROCESS_INIT_CREATE & 1)
1860	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1861	printk("\n[%s] thread[%x,%x] registered init process in parent\n",
1862	__FUNCTION__, this->process->pid, this->trdid );
1863	#endif
1864
1865	// select a core in local cluster to execute the main thread
1866	lid = cluster_select_local_core();
1867
1868	// initialize pthread attributes for main thread
1869	attr.attributes = PT_ATTR_DETACH \| PT_ATTR_CLUSTER_DEFINED \| PT_ATTR_CORE_DEFINED;
1870	attr.cxy = local_cxy;
1871	attr.lid = lid;
1872
1873	// create and initialize thread descriptor
1874	error = thread_user_create( pid,
1875	(void *)process->vmm.entry_point,
1876	NULL,
1877	&attr,
1878	&thread );
1879
1880	if( error )
1881	{
1882	printk("\n[PANIC] in %s : cannot create main thread\n", __FUNCTION__ );
1883	hal_core_sleep();
1884	}
1885	if( thread->trdid != 0 )
1886	{
1887	printk("\n[PANIC] in %s : bad main thread trdid\n", __FUNCTION__ );
1888	hal_core_sleep();
1889	}
1890
1891	#if(DEBUG_PROCESS_INIT_CREATE & 1)
1892	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1893	printk("\n[%s] thread[%x,%x] created main thread\n",
1894	__FUNCTION__, this->process->pid, this->trdid );
1895	#endif
1896
1897	// activate thread
1898	thread_unblock( XPTR( local_cxy , thread ) , THREAD_BLOCKED_GLOBAL );
1899
1900	hal_fence();
1901
1902	#if DEBUG_PROCESS_INIT_CREATE
1903	cycle = (uint32_t)hal_get_cycles();
1904	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1905	printk("\n[%s] thread[%x,%x] exit / cycle %d\n",
1906	__FUNCTION__, this->process->pid, this->trdid, cycle );
1907	#endif
1908
1909	} // end process_init_create()
1910
1911	/////////////////////////////////////////
1912	void process_display( xptr_t process_xp )
1913	{
1914	process_t * process_ptr;
1915	cxy_t process_cxy;
1916
1917	xptr_t parent_xp; // extended pointer on parent process
1918	process_t * parent_ptr;
1919	cxy_t parent_cxy;
1920
1921	xptr_t owner_xp; // extended pointer on owner process
1922	process_t * owner_ptr;
1923	cxy_t owner_cxy;
1924
1925	pid_t pid;
1926	pid_t ppid;
1927	lpid_t lpid;
1928	uint32_t state;
1929	uint32_t th_nr;
1930
1931	xptr_t txt_file_xp; // extended pointer on TXT_RX file descriptor
1932	xptr_t txt_chdev_xp; // extended pointer on TXT_RX chdev
1933	chdev_t * txt_chdev_ptr;
1934	cxy_t txt_chdev_cxy;
1935	xptr_t txt_owner_xp; // extended pointer on TXT owner process
1936
1937	xptr_t elf_file_xp; // extended pointer on .elf file
1938	cxy_t elf_file_cxy;
1939	vfs_file_t * elf_file_ptr;
1940	vfs_inode_t * elf_inode_ptr; // local pointer on .elf inode
1941
1942	char txt_name[CONFIG_VFS_MAX_NAME_LENGTH];
1943	char elf_name[CONFIG_VFS_MAX_NAME_LENGTH];
1944
1945	// get cluster and local pointer on process
1946	process_ptr = GET_PTR( process_xp );
1947	process_cxy = GET_CXY( process_xp );
1948
1949	// get process PID, LPID, and state
1950	pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid ) );
1951	lpid = LPID_FROM_PID( pid );
1952	state = hal_remote_l32( XPTR( process_cxy , &process_ptr->term_state ) );
1953
1954	// get process PPID
1955	parent_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->parent_xp ) );
1956	parent_cxy = GET_CXY( parent_xp );
1957	parent_ptr = GET_PTR( parent_xp );
1958	ppid = hal_remote_l32( XPTR( parent_cxy , &parent_ptr->pid ) );
1959
1960	// get number of threads
1961	th_nr = hal_remote_l32( XPTR( process_cxy , &process_ptr->th_nr ) );
1962
1963	// get pointers on owner process descriptor
1964	owner_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->owner_xp ) );
1965	owner_cxy = GET_CXY( owner_xp );
1966	owner_ptr = GET_PTR( owner_xp );
1967
1968	// get process TXT name and .elf name
1969	if( lpid ) // user process
1970	{
1971
1972	// get extended pointer on file descriptor associated to TXT_RX
1973	txt_file_xp = hal_remote_l64( XPTR( owner_cxy , &owner_ptr->fd_array.array[0] ) );
1974
1975	assert( (txt_file_xp != XPTR_NULL) ,
1976	"process must be attached to one TXT terminal" );
1977
1978	// get TXT_RX chdev pointers
1979	txt_chdev_xp = chdev_from_file( txt_file_xp );
1980	txt_chdev_cxy = GET_CXY( txt_chdev_xp );
1981	txt_chdev_ptr = GET_PTR( txt_chdev_xp );
1982
1983	// get TXT_RX name and ownership
1984	hal_remote_strcpy( XPTR( local_cxy , txt_name ) ,
1985	XPTR( txt_chdev_cxy , txt_chdev_ptr->name ) );
1986
1987	txt_owner_xp = (xptr_t)hal_remote_l64( XPTR( txt_chdev_cxy,
1988	&txt_chdev_ptr->ext.txt.owner_xp ) );
1989
1990	// get process .elf name
1991	elf_file_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->vfs_bin_xp ) );
1992	elf_file_cxy = GET_CXY( elf_file_xp );
1993	elf_file_ptr = GET_PTR( elf_file_xp );
1994	elf_inode_ptr = hal_remote_lpt( XPTR( elf_file_cxy , &elf_file_ptr->inode ) );
1995	vfs_inode_get_name( XPTR( elf_file_cxy , elf_inode_ptr ) , elf_name );
1996	}
1997	else // kernel process_zero
1998	{
1999	// TXT name and .elf name are not registered in kernel process_zero
2000	strcpy( txt_name , "txt0_rx" );
2001	txt_owner_xp = process_xp;
2002	strcpy( elf_name , "kernel.elf" );
2003	}
2004
2005	// display process info
2006	if( txt_owner_xp == process_xp )
2007	{
2008	nolock_printk("PID %X \| %s (FG) \| %X \| PPID %X \| TS %X \| %d \| %s\n",
2009	pid, txt_name, process_ptr, ppid, state, th_nr, elf_name );
2010	}
2011	else
2012	{
2013	nolock_printk("PID %X \| %s (BG) \| %X \| PPID %X \| TS %X \| %d \| %s\n",
2014	pid, txt_name, process_ptr, ppid, state, th_nr, elf_name );
2015	}
2016	} // end process_display()
2017
2018
2019	////////////////////////////////////////////////////////////////////////////////////////
2020	// Terminals related functions
2021	////////////////////////////////////////////////////////////////////////////////////////
2022
2023	//////////////////////////////////
2024	uint32_t process_txt_alloc( void )
2025	{
2026	uint32_t index; // TXT terminal index
2027	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
2028	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
2029	cxy_t chdev_cxy; // TXT_RX chdev cluster
2030	xptr_t root_xp; // extended pointer on owner field in chdev
2031
2032	// scan the user TXT_RX chdevs (TXT0 is reserved for kernel)
2033	for( index = 1 ; index < LOCAL_CLUSTER->nb_txt_channels ; index ++ )
2034	{
2035	// get pointers on TXT_RX[index]
2036	chdev_xp = chdev_dir.txt_rx[index];
2037	chdev_cxy = GET_CXY( chdev_xp );
2038	chdev_ptr = GET_PTR( chdev_xp );
2039
2040	// get extended pointer on root of attached process
2041	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
2042
2043	// return free TXT index if found
2044	if( xlist_is_empty( root_xp ) ) return index;
2045	}
2046
2047	assert( false , "no free TXT terminal found" );
2048
2049	return -1;
2050
2051	} // end process_txt_alloc()
2052
2053	/////////////////////////////////////////////
2054	void process_txt_attach( process_t * process,
2055	uint32_t txt_id )
2056	{
2057	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
2058	cxy_t chdev_cxy; // TXT_RX chdev cluster
2059	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
2060	xptr_t root_xp; // extended pointer on list root in chdev
2061	xptr_t lock_xp; // extended pointer on list lock in chdev
2062
2063	// check process is in owner cluster
2064	assert( (CXY_FROM_PID( process->pid ) == local_cxy) ,
2065	"process descriptor not in owner cluster" );
2066
2067	// check terminal index
2068	assert( (txt_id < LOCAL_CLUSTER->nb_txt_channels) ,
2069	"illegal TXT terminal index" );
2070
2071	// get pointers on TXT_RX[txt_id] chdev
2072	chdev_xp = chdev_dir.txt_rx[txt_id];
2073	chdev_cxy = GET_CXY( chdev_xp );
2074	chdev_ptr = GET_PTR( chdev_xp );
2075
2076	// get extended pointer on root & lock of attached process list
2077	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
2078	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
2079
2080	// get lock protecting list of processes attached to TXT
2081	remote_busylock_acquire( lock_xp );
2082
2083	// insert process in attached process list
2084	xlist_add_last( root_xp , XPTR( local_cxy , &process->txt_list ) );
2085
2086	// release lock protecting list of processes attached to TXT
2087	remote_busylock_release( lock_xp );
2088
2089	#if DEBUG_PROCESS_TXT
2090	thread_t * this = CURRENT_THREAD;
2091	uint32_t cycle = (uint32_t)hal_get_cycles();
2092	if( DEBUG_PROCESS_TXT < cycle )
2093	printk("\n[%s] thread[%x,%x] attached process %x to TXT %d / cycle %d\n",
2094	__FUNCTION__, this->process->pid, this->trdid, process->pid, txt_id , cycle );
2095	#endif
2096
2097	} // end process_txt_attach()
2098
2099	/////////////////////////////////////////////
2100	void process_txt_detach( xptr_t process_xp )
2101	{
2102	process_t * process_ptr; // local pointer on process in owner cluster
2103	cxy_t process_cxy; // process owner cluster
2104	pid_t process_pid; // process identifier
2105	xptr_t file_xp; // extended pointer on stdin file
2106	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
2107	cxy_t chdev_cxy; // TXT_RX chdev cluster
2108	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
2109	xptr_t lock_xp; // extended pointer on list lock in chdev
2110
2111	// get process cluster, local pointer, and PID
2112	process_cxy = GET_CXY( process_xp );
2113	process_ptr = GET_PTR( process_xp );
2114	process_pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid ) );
2115
2116	// check process descriptor in owner cluster
2117	assert( (CXY_FROM_PID( process_pid ) == process_cxy ) ,
2118	"process descriptor not in owner cluster" );
2119
2120	// release TXT ownership (does nothing if not TXT owner)
2121	process_txt_transfer_ownership( process_xp );
2122
2123	// get extended pointer on process stdin pseudo file
2124	file_xp = (xptr_t)hal_remote_l64( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
2125
2126	// get pointers on TXT_RX chdev
2127	chdev_xp = chdev_from_file( file_xp );
2128	chdev_cxy = GET_CXY( chdev_xp );
2129	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
2130
2131	// get extended pointer on lock protecting attached process list
2132	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
2133
2134	// get lock protecting list of processes attached to TXT
2135	remote_busylock_acquire( lock_xp );
2136
2137	// unlink process from attached process list
2138	xlist_unlink( XPTR( process_cxy , &process_ptr->txt_list ) );
2139
2140	// release lock protecting list of processes attached to TXT
2141	remote_busylock_release( lock_xp );
2142
2143	#if DEBUG_PROCESS_TXT
2144	thread_t * this = CURRENT_THREAD;
2145	uint32_t cycle = (uint32_t)hal_get_cycles();
2146	uint32_t txt_id = hal_remote_l32( XPTR( chdev_cxy , &chdev_ptr->channel ) );
2147	if( DEBUG_PROCESS_TXT < cycle )
2148	printk("\n[%s] thread[%x,%x] detached process %x from TXT%d / cycle %d\n",
2149	__FUNCTION__, this->process->pid, this->trdid, process_pid, txt_id, cycle );
2150	#endif
2151
2152	} // end process_txt_detach()
2153
2154	///////////////////////////////////////////////////
2155	void process_txt_set_ownership( xptr_t process_xp )
2156	{
2157	process_t * process_ptr;
2158	cxy_t process_cxy;
2159	pid_t process_pid;
2160	xptr_t file_xp;
2161	xptr_t txt_xp;
2162	chdev_t * txt_ptr;
2163	cxy_t txt_cxy;
2164
2165	// get pointers on process in owner cluster
2166	process_cxy = GET_CXY( process_xp );
2167	process_ptr = GET_PTR( process_xp );
2168	process_pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid ) );
2169
2170	// check owner cluster
2171	assert( (process_cxy == CXY_FROM_PID( process_pid )) ,
2172	"process descriptor not in owner cluster" );
2173
2174	// get extended pointer on stdin pseudo file
2175	file_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
2176
2177	// get pointers on TXT chdev
2178	txt_xp = chdev_from_file( file_xp );
2179	txt_cxy = GET_CXY( txt_xp );
2180	txt_ptr = GET_PTR( txt_xp );
2181
2182	// set owner field in TXT chdev
2183	hal_remote_s64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , process_xp );
2184
2185	#if DEBUG_PROCESS_TXT
2186	thread_t * this = CURRENT_THREAD;
2187	uint32_t cycle = (uint32_t)hal_get_cycles();
2188	uint32_t txt_id = hal_remote_l32( XPTR( txt_cxy , &txt_ptr->channel ) );
2189	if( DEBUG_PROCESS_TXT < cycle )
2190	printk("\n[%s] thread[%x,%x] give TXT%d ownership to process %x / cycle %d\n",
2191	__FUNCTION__, this->process->pid, this->trdid, txt_id, process_pid, cycle );
2192	#endif
2193
2194	} // end process_txt_set ownership()
2195
2196	////////////////////////////////////////////////////////
2197	void process_txt_transfer_ownership( xptr_t process_xp )
2198	{
2199	process_t * process_ptr; // local pointer on process releasing ownership
2200	cxy_t process_cxy; // process cluster
2201	pid_t process_pid; // process identifier
2202	xptr_t file_xp; // extended pointer on TXT_RX pseudo file
2203	xptr_t txt_xp; // extended pointer on TXT_RX chdev
2204	chdev_t * txt_ptr; // local pointer on TXT_RX chdev
2205	cxy_t txt_cxy; // cluster of TXT_RX chdev
2206	uint32_t txt_id; // TXT_RX channel
2207	xptr_t owner_xp; // extended pointer on current TXT_RX owner
2208	xptr_t root_xp; // extended pointer on root of attached process list
2209	xptr_t lock_xp; // extended pointer on lock protecting attached process list
2210	xptr_t iter_xp; // iterator for xlist
2211	xptr_t current_xp; // extended pointer on current process
2212	bool_t found;
2213
2214	#if DEBUG_PROCESS_TXT
2215	thread_t * this = CURRENT_THREAD;
2216	uint32_t cycle;
2217	#endif
2218
2219	// get pointers on target process
2220	process_cxy = GET_CXY( process_xp );
2221	process_ptr = GET_PTR( process_xp );
2222	process_pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid ) );
2223
2224	// check owner cluster
2225	assert( (process_cxy == CXY_FROM_PID( process_pid )) ,
2226	"process descriptor not in owner cluster" );
2227
2228	// get extended pointer on stdin pseudo file
2229	file_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
2230
2231	// get pointers on TXT chdev
2232	txt_xp = chdev_from_file( file_xp );
2233	txt_cxy = GET_CXY( txt_xp );
2234	txt_ptr = GET_PTR( txt_xp );
2235
2236	// get relevant infos from chdev descriptor
2237	owner_xp = hal_remote_l64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) );
2238	txt_id = hal_remote_l32( XPTR( txt_cxy , &txt_ptr->channel ) );
2239
2240	// transfer ownership only if target process is the TXT owner
2241	if( (owner_xp == process_xp) && (txt_id > 0) )
2242	{
2243	// get extended pointers on root and lock of attached processes list
2244	root_xp = XPTR( txt_cxy , &txt_ptr->ext.txt.root );
2245	lock_xp = XPTR( txt_cxy , &txt_ptr->ext.txt.lock );
2246
2247	if( process_get_ppid( process_xp ) != 1 ) // target process is not KSH
2248	{
2249	// get lock
2250	remote_busylock_acquire( lock_xp );
2251
2252	// scan attached process list to find KSH process
2253	found = false;
2254	for( iter_xp = hal_remote_l64( root_xp ) ;
2255	(iter_xp != root_xp) && (found == false) ;
2256	iter_xp = hal_remote_l64( iter_xp ) )
2257	{
2258	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
2259
2260	if( process_get_ppid( current_xp ) == 1 ) // current is KSH
2261	{
2262	// set owner field in TXT chdev
2263	hal_remote_s64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , current_xp );
2264
2265	#if DEBUG_PROCESS_TXT
2266	cycle = (uint32_t)hal_get_cycles();
2267	if( DEBUG_PROCESS_TXT < cycle )
2268	printk("\n[%s] thread[%x,%x] transfered TXT%d ownership to KSH / cycle %d\n",
2269	__FUNCTION__, this->process->pid, this->trdid, txt_id, cycle );
2270	#endif
2271	found = true;
2272	}
2273	}
2274
2275	// release lock
2276	remote_busylock_release( lock_xp );
2277
2278	// It must exist a KSH process for each user TXT channel
2279	assert( (found == true), "KSH process not found for TXT%d", txt_id );
2280
2281	}
2282	else // target process is KSH
2283	{
2284	// get lock
2285	remote_busylock_acquire( lock_xp );
2286
2287	// scan attached process list to find another process
2288	found = false;
2289	for( iter_xp = hal_remote_l64( root_xp ) ;
2290	(iter_xp != root_xp) && (found == false) ;
2291	iter_xp = hal_remote_l64( iter_xp ) )
2292	{
2293	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
2294
2295	if( current_xp != process_xp ) // current is not KSH
2296	{
2297	// set owner field in TXT chdev
2298	hal_remote_s64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , current_xp );
2299
2300	#if DEBUG_PROCESS_TXT
2301	cycle = (uint32_t)hal_get_cycles();
2302	cxy_t current_cxy = GET_CXY( current_xp );
2303	process_t * current_ptr = GET_PTR( current_xp );
2304	uint32_t new_pid = hal_remote_l32( XPTR( current_cxy , &current_ptr->pid ) );
2305	if( DEBUG_PROCESS_TXT < cycle )
2306	printk("\n[%s] thread[%x,%x] transfered TXT%d ownership to process %x / cycle %d\n",
2307	__FUNCTION__,this->process->pid, this->trdid, txt_id, new_pid, cycle );
2308	#endif
2309	found = true;
2310	}
2311	}
2312
2313	// release lock
2314	remote_busylock_release( lock_xp );
2315
2316	// no more owner for TXT if no other process found
2317	if( found == false )
2318	{
2319	// set owner field in TXT chdev
2320	hal_remote_s64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , XPTR_NULL );
2321
2322	#if DEBUG_PROCESS_TXT
2323	cycle = (uint32_t)hal_get_cycles();
2324	if( DEBUG_PROCESS_TXT < cycle )
2325	printk("\n[%s] thread[%x,%x] released TXT%d (no attached process) / cycle %d\n",
2326	__FUNCTION__, this->process->pid, this->trdid, txt_id, cycle );
2327	#endif
2328	}
2329	}
2330	}
2331	else
2332	{
2333
2334	#if DEBUG_PROCESS_TXT
2335	cycle = (uint32_t)hal_get_cycles();
2336	if( DEBUG_PROCESS_TXT < cycle )
2337	printk("\n[%s] thread[%x,%x] does nothing for process %x (not TXT owner) / cycle %d\n",
2338	__FUNCTION__, this->process->pid, this->trdid, process_pid, cycle );
2339	#endif
2340
2341	}
2342
2343	} // end process_txt_transfer_ownership()
2344
2345
2346	////////////////////////////////////////////////
2347	bool_t process_txt_is_owner( xptr_t process_xp )
2348	{
2349	// get local pointer and cluster of process in owner cluster
2350	cxy_t process_cxy = GET_CXY( process_xp );
2351	process_t * process_ptr = GET_PTR( process_xp );
2352
2353	// check calling thread execute in target process owner cluster
2354	pid_t process_pid = hal_remote_l32( XPTR( process_cxy , &process_ptr->pid ) );
2355	assert( (process_cxy == CXY_FROM_PID( process_pid )) ,
2356	"process descriptor not in owner cluster" );
2357
2358	// get extended pointer on stdin pseudo file
2359	xptr_t file_xp = hal_remote_l64( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
2360
2361	// get pointers on TXT chdev
2362	xptr_t txt_xp = chdev_from_file( file_xp );
2363	cxy_t txt_cxy = GET_CXY( txt_xp );
2364	chdev_t * txt_ptr = GET_PTR( txt_xp );
2365
2366	// get extended pointer on TXT_RX owner process
2367	xptr_t owner_xp = hal_remote_l64( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) );
2368
2369	return (process_xp == owner_xp);
2370
2371	} // end process_txt_is_owner()
2372
2373	////////////////////////////////////////////////
2374	xptr_t process_txt_get_owner( uint32_t channel )
2375	{
2376	xptr_t txt_rx_xp = chdev_dir.txt_rx[channel];
2377	cxy_t txt_rx_cxy = GET_CXY( txt_rx_xp );
2378	chdev_t * txt_rx_ptr = GET_PTR( txt_rx_xp );
2379
2380	return (xptr_t)hal_remote_l64( XPTR( txt_rx_cxy , &txt_rx_ptr->ext.txt.owner_xp ) );
2381
2382	} // end process_txt_get_owner()
2383
2384	///////////////////////////////////////////
2385	void process_txt_display( uint32_t txt_id )
2386	{
2387	xptr_t chdev_xp;
2388	cxy_t chdev_cxy;
2389	chdev_t * chdev_ptr;
2390	xptr_t root_xp;
2391	xptr_t lock_xp;
2392	xptr_t current_xp;
2393	xptr_t iter_xp;
2394	cxy_t txt0_cxy;
2395	chdev_t * txt0_ptr;
2396	xptr_t txt0_xp;
2397	xptr_t txt0_lock_xp;
2398
2399	assert( (txt_id < LOCAL_CLUSTER->nb_txt_channels) ,
2400	"illegal TXT terminal index" );
2401
2402	// get pointers on TXT0 chdev
2403	txt0_xp = chdev_dir.txt_tx[0];
2404	txt0_cxy = GET_CXY( txt0_xp );
2405	txt0_ptr = GET_PTR( txt0_xp );
2406
2407	// get extended pointer on TXT0 lock
2408	txt0_lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
2409
2410	// get pointers on TXT_RX[txt_id] chdev
2411	chdev_xp = chdev_dir.txt_rx[txt_id];
2412	chdev_cxy = GET_CXY( chdev_xp );
2413	chdev_ptr = GET_PTR( chdev_xp );
2414
2415	// get extended pointer on root & lock of attached process list
2416	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
2417	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
2418
2419	// get lock on attached process list
2420	remote_busylock_acquire( lock_xp );
2421
2422	// get TXT0 lock in busy waiting mode
2423	remote_busylock_acquire( txt0_lock_xp );
2424
2425	// display header
2426	nolock_printk("\n***** processes attached to TXT_%d / cycle %d\n",
2427	txt_id , (uint32_t)hal_get_cycles() );
2428
2429	// scan attached process list
2430	XLIST_FOREACH( root_xp , iter_xp )
2431	{
2432	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
2433	process_display( current_xp );
2434	}
2435
2436	// release TXT0 lock in busy waiting mode
2437	remote_busylock_release( txt0_lock_xp );
2438
2439	// release lock on attached process list
2440	remote_busylock_release( lock_xp );
2441
2442	} // end process_txt_display

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