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source: trunk/hal/tsar_mips32/drivers/soclib_tty.c @ 472

Last change on this file since 472 was 457, checked in by alain, 7 years ago
This version modifies the exec syscall and fixes a large number of small bugs. The version number has been updated (0.1)
File size: 20.2 KB

Rev	Line
[75]	1	/*
	2	* soclib_tty.c - soclib tty driver implementation.
	3	*
[451]	4	* Author Alain Greiner (2016,2017,2018)
[75]	5	*
	6	* Copyright (c) UPMC Sorbonne Universites
	7	*
	8	* This file is part of ALMOS-MKH..
	9	*
	10	* ALMOS-MKH. is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; version 2.0 of the License.
	13	*
	14	* ALMOS-MKH. is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with ALMOS-MKH.; if not, write to the Free Software Foundation,
	21	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	22	*/
	23
[451]	24
	25	#include <hal_kernel_types.h>
[75]	26	#include <dev_txt.h>
	27	#include <chdev.h>
	28	#include <soclib_tty.h>
	29	#include <remote_spinlock.h>
	30	#include <thread.h>
[407]	31	#include <printk.h>
[75]	32	#include <hal_special.h>
	33
[438]	34	#if (DEBUG_SYS_READ & 1)
[435]	35	extern uint32_t enter_tty_cmd_read;
	36	extern uint32_t exit_tty_cmd_read;
[407]	37
[435]	38	extern uint32_t enter_tty_isr_read;
	39	extern uint32_t exit_tty_isr_read;
[407]	40	#endif
	41
[438]	42	#if (DEBUG_SYS_WRITE & 1)
[435]	43	extern uint32_t enter_tty_cmd_write;
	44	extern uint32_t exit_tty_cmd_write;
	45
	46	extern uint32_t enter_tty_isr_write;
	47	extern uint32_t exit_tty_isr_write;
	48	#endif
	49
[436]	50	////////////////////////////////////////////////////////////////////////////////////
	51	// These global variables implement the TTY_RX FIFOs (one per channel)
	52	////////////////////////////////////////////////////////////////////////////////////
	53
	54	__attribute__((section(".kdata")))
	55	tty_fifo_t tty_rx_fifo[CONFIG_MAX_TXT_CHANNELS];
	56
	57	__attribute__((section(".kdata")))
	58	tty_fifo_t tty_tx_fifo[CONFIG_MAX_TXT_CHANNELS];
	59
[75]	60	///////////////////////////////////////
	61	void soclib_tty_init( chdev_t * chdev )
	62	{
[407]	63	xptr_t reg_xp;
	64
[436]	65	// initialise function pointers in chdev
[77]	66	chdev->cmd = &soclib_tty_cmd;
	67	chdev->isr = &soclib_tty_isr;
[407]	68	chdev->aux = &soclib_tty_aux;
[77]	69
[407]	70	// get TTY channel and extended pointer on TTY peripheral base address
	71	xptr_t tty_xp = chdev->base;
	72	uint32_t channel = chdev->channel;
[436]	73	bool_t is_rx = chdev->is_rx;
[75]	74
	75	// get SOCLIB_TTY device cluster and local pointer
	76	cxy_t tty_cxy = GET_CXY( tty_xp );
[435]	77	uint32_t * tty_ptr = GET_PTR( tty_xp );
[75]	78
[435]	79	// set TTY_RX_IRQ_ENABLE
[407]	80	reg_xp = XPTR( tty_cxy , tty_ptr + (channel * TTY_SPAN) + TTY_RX_IRQ_ENABLE );
[435]	81	hal_remote_sw( reg_xp , 1 );
[407]	82
	83	// reset TTY_TX_IRQ_ENABLE
	84	reg_xp = XPTR( tty_cxy , tty_ptr + (channel * TTY_SPAN) + TTY_TX_IRQ_ENABLE );
	85	hal_remote_sw( reg_xp , 0 );
[75]	86
[436]	87	// reset relevant FIFO
	88	if( is_rx )
	89	{
	90	tty_rx_fifo[channel].sts = 0;
	91	tty_rx_fifo[channel].ptr = 0;
	92	tty_rx_fifo[channel].ptw = 0;
	93	}
	94	else
	95	{
	96	tty_tx_fifo[channel].sts = 0;
	97	tty_tx_fifo[channel].ptr = 0;
	98	tty_tx_fifo[channel].ptw = 0;
	99	}
	100	} // end soclib_tty_init()
	101
[75]	102	//////////////////////////////////////////////////////////////
	103	void __attribute__ ((noinline)) soclib_tty_cmd( xptr_t th_xp )
	104	{
[436]	105	tty_fifo_t * fifo; // TTY_RX or TTY_TX FIFO
	106	char byte; // byte value
	107	uint32_t done; // number of bytes moved
[407]	108
[436]	109	// get client thread cluster and local pointer
	110	cxy_t th_cxy = GET_CXY( th_xp );
	111	thread_t * th_ptr = GET_PTR( th_xp );
	112
	113	// get command arguments
	114	uint32_t type = hal_remote_lw ( XPTR( th_cxy , &th_ptr->txt_cmd.type ) );
	115	xptr_t buf_xp = hal_remote_lwd( XPTR( th_cxy , &th_ptr->txt_cmd.buf_xp ) );
	116	uint32_t count = hal_remote_lw ( XPTR( th_cxy , &th_ptr->txt_cmd.count ) );
	117	xptr_t error_xp = XPTR( th_cxy , &th_ptr->txt_cmd.error );
	118
[438]	119	#if (DEBUG_SYS_READ & 1)
[435]	120	if( type == TXT_READ) enter_tty_cmd_read = (uint32_t)hal_get_cycles();
[407]	121	#endif
	122
[438]	123	#if (DEBUG_SYS_WRITE & 1)
[435]	124	if( type == TXT_WRITE) enter_tty_cmd_write = (uint32_t)hal_get_cycles();
[432]	125	#endif
[407]	126
[440]	127	// get TXT device cluster and pointers
	128	xptr_t dev_xp = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->txt_cmd.dev_xp ) );
	129	cxy_t dev_cxy = GET_CXY( dev_xp );
	130	chdev_t * dev_ptr = GET_PTR( dev_xp );
[436]	131
[440]	132	// get cluster and pointers for SOCLIB_TTY peripheral base segment
	133	xptr_t tty_xp = (xptr_t)hal_remote_lwd( XPTR( dev_cxy , &dev_ptr->base ) );
[436]	134	cxy_t tty_cxy = GET_CXY( tty_xp );
	135	uint32_t * tty_ptr = GET_PTR( tty_xp );
	136
	137	// get TTY channel index and channel base address
	138	uint32_t channel = hal_remote_lw( XPTR( dev_cxy , &dev_ptr->channel ) );
	139	uint32_t * base = tty_ptr + TTY_SPAN * channel;
	140
	141	///////////////////////
	142	if( type == TXT_WRITE ) // write bytes to TTY_TX FIFO
[435]	143	{
[436]	144	fifo = &tty_tx_fifo[channel];
[75]	145
[436]	146	done = 0;
[75]	147
[436]	148	while( done < count )
	149	{
	150	if( fifo->sts < TTY_FIFO_DEPTH ) // put one byte to FIFO if TX_FIFO not full
	151	{
	152	// get one byte from command buffer
	153	byte = hal_remote_lb( buf_xp + done );
[75]	154
[451]	155	#if DEBUG_HAL_TXT_TX
	156	uint32_t tx_cycle = (uint32_t)hal_get_cycles();
	157	if( DEBUG_HAL_TXT_TX < tx_cycle )
	158	printk("\n[DBG] %s : thread %x put character <%c> to TXT%d_TX fifo / cycle %d\n",
	159	__FUNCTION__, CURRENT_THREAD, byte, channel, tx_cycle );
	160	#endif
[436]	161	// write byte to FIFO
	162	fifo->data[fifo->ptw] = byte;
[75]	163
[436]	164	// prevent race
	165	hal_fence();
[75]	166
[436]	167	// update FIFO state
	168	fifo->ptw = (fifo->ptw + 1) % TTY_FIFO_DEPTH;
	169	hal_atomic_add( &fifo->sts , 1 );
[75]	170
[436]	171	// udate number of bytes moved
	172	done++;
[75]	173
[436]	174	// enable TX_IRQ
	175	hal_remote_sw( XPTR( tty_cxy , base + TTY_TX_IRQ_ENABLE ) , 1 );
	176	}
	177	else // block & deschedule if TX_FIFO full
	178	{
	179	// block on ISR
	180	thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_ISR );
	181
	182	// deschedule
	183	sched_yield( "TTY_TX_FIFO full" );
	184	}
	185	}
	186
	187	// set error status in command and return
	188	hal_remote_sw( error_xp , 0 );
[435]	189	}
[436]	190	///////////////////////////
	191	else if( type == TXT_READ ) // read bytes from TTY_RX FIFO
[435]	192	{
[436]	193	fifo = &tty_rx_fifo[channel];
[75]	194
[436]	195	done = 0;
	196
	197	while( done < count )
	198	{
	199	if( fifo->sts > 0 ) // get byte from FIFO if not empty
	200	{
	201	// get one byte from FIFO
	202	char byte = fifo->data[fifo->ptr];
	203
[451]	204	#if DEBUG_HAL_TXT_RX
	205	uint32_t rx_cycle = (uint32_t)hal_get_cycles();
	206	if( DEBUG_HAL_TXT_RX < rx_cycle )
	207	printk("\n[DBG] %s : thread %x get character <%c> from TXT%d_RX fifo / cycle %d\n",
	208	__FUNCTION__, CURRENT_THREAD, byte, channel, rx_cycle );
	209	#endif
[436]	210	// update FIFO state
	211	fifo->ptr = (fifo->ptr + 1) % TTY_FIFO_DEPTH;
	212	hal_atomic_add( &fifo->sts , -1 );
	213
	214	// set byte to command buffer
	215	hal_remote_sb( buf_xp + done , byte );
	216
	217	// udate number of bytes
	218	done++;
	219	}
	220	else // deschedule if FIFO empty
	221	{
	222	// block on ISR
	223	thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_ISR );
	224
	225	// deschedule
[446]	226	sched_yield( "TTY_RX_FIFO empty" );
[436]	227	}
	228	} // end while
	229
	230	// set error status in command
	231	hal_remote_sw( error_xp , 0 );
[435]	232	}
	233	else
	234	{
	235	assert( false , __FUNCTION__ , "illegal TXT command\n" );
	236	}
	237
[438]	238	#if (DEBUG_SYS_READ & 1)
[435]	239	if( type == TXT_READ ) exit_tty_cmd_read = (uint32_t)hal_get_cycles();
[407]	240	#endif
	241
[438]	242	#if (DEBUG_SYS_WRITE & 1)
[435]	243	if( type == TXT_WRITE ) exit_tty_cmd_write = (uint32_t)hal_get_cycles();
	244	#endif
	245
[407]	246	} // end soclib_tty_cmd()
	247
[75]	248	/////////////////////////////////////////////////////////////////
	249	void __attribute__ ((noinline)) soclib_tty_isr( chdev_t * chdev )
	250	{
[446]	251	thread_t * server; // pointer on TXT chdev server thread
	252	lid_t server_lid; // local index of core running the server thread
	253	uint32_t channel; // TXT chdev channel
	254	bool_t is_rx; // TXT chdev direction
	255	char byte; // byte value
	256	xptr_t owner_xp; // extended pointer on TXT owner process
	257	cxy_t owner_cxy; // TXT owner process cluster
	258	process_t * owner_ptr; // local pointer on TXT owner process
	259	pid_t owner_pid; // TXT owner process identifier
	260	tty_fifo_t * fifo; // pointer on TTY_TX or TTY_RX FIFO
	261	cxy_t tty_cxy; // soclib_tty cluster
	262	uint32_t * tty_ptr; // soclib_tty segment base address
	263	uint32_t * base; // soclib_tty channel base address
	264	xptr_t status_xp; // extended pointer on TTY_STATUS register
	265	xptr_t write_xp; // extended pointer on TTY_WRITE register
	266	xptr_t read_xp; // extended pointer on TTY_READ register
	267	xptr_t parent_xp; // extended pointer on parent process
	268	cxy_t parent_cxy; // parent process cluster
	269	process_t * parent_ptr; // local pointer on parent process
	270	xptr_t children_lock_xp; // extended pointer on children processes lock
	271	thread_t * parent_main_ptr; // extended pointer on parent process main thread
	272	xptr_t parent_main_xp; // local pointer on parent process main thread
[75]	273
[457]	274	// get TXT chdev channel, direction, server thread, and server core
[436]	275	channel = chdev->channel;
	276	is_rx = chdev->is_rx;
	277	server = chdev->server;
	278	server_lid = server->core->lid;
	279
[438]	280	#if (DEBUG_SYS_READ & 1)
[436]	281	if( is_rx ) enter_tty_isr_read = (uint32_t)hal_get_cycles();
[407]	282	#endif
	283
[438]	284	#if (DEBUG_SYS_WRITE & 1)
[436]	285	if( is_rx == 0 ) enter_tty_isr_write = (uint32_t)hal_get_cycles();
[435]	286	#endif
	287
[438]	288	#if DEBUG_HAL_TXT_RX
[446]	289	uint32_t rx_cycle = (uint32_t)hal_get_cycles();
[432]	290	#endif
	291
[438]	292	#if DEBUG_HAL_TXT_TX
[446]	293	uint32_t tx_cycle = (uint32_t)hal_get_cycles();
[436]	294	#endif
[75]	295
[424]	296	// get SOCLIB_TTY peripheral cluster and local pointer
[436]	297	tty_cxy = GET_CXY( chdev->base );
	298	tty_ptr = GET_PTR( chdev->base );
[424]	299
	300	// get channel base address
[436]	301	base = tty_ptr + TTY_SPAN * channel;
[424]	302
	303	// get extended pointer on TTY registers
	304	status_xp = XPTR( tty_cxy , base + TTY_STATUS );
	305	write_xp = XPTR( tty_cxy , base + TTY_WRITE );
	306	read_xp = XPTR( tty_cxy , base + TTY_READ );
	307
[436]	308	/////////////////////////// handle RX //////////////////////
	309	if( is_rx )
[424]	310	{
[436]	311	fifo = &tty_rx_fifo[channel];
[424]	312
[436]	313	// try to move bytes until TTY_READ register empty
	314	while( hal_remote_lw( status_xp ) & TTY_STATUS_RX_FULL )
[435]	315	{
[436]	316	// get one byte from TTY_READ register & acknowledge RX_IRQ
	317	byte = (char)hal_remote_lb( read_xp );
[424]	318
[446]	319	// filter special character ^Z => block TXT owner process
[436]	320	if( byte == 0x1A )
	321	{
[446]	322
	323	#if DEBUG_HAL_TXT_RX
	324	if( DEBUG_HAL_TXT_RX < rx_cycle )
	325	printk("\n[DBG] %s : read ^Z character from TXT%d\n", __FUNCTION__, channel );
	326	#endif
[436]	327	// get pointers on TXT owner process in owner cluster
	328	owner_xp = process_txt_get_owner( channel );
	329
	330	// check process exist
	331	assert( (owner_xp != XPTR_NULL) , __FUNCTION__,
	332	"TXT owner process not found\n" );
[435]	333
[446]	334	// get relevant infos on TXT owner process
[436]	335	owner_cxy = GET_CXY( owner_xp );
	336	owner_ptr = GET_PTR( owner_xp );
	337	owner_pid = hal_remote_lw( XPTR( owner_cxy , &owner_ptr->pid ) );
[424]	338
[446]	339	// block TXT owner process only if it is not the INIT process
	340	if( owner_pid != 1 )
[436]	341	{
[446]	342	// get parent process descriptor pointers
	343	parent_xp = hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->parent_xp ) );
	344	parent_cxy = GET_CXY( parent_xp );
	345	parent_ptr = GET_PTR( parent_xp );
	346
	347	// get extended pointer on lock protecting children list in parent process
	348	children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock );
	349
	350	// get pointers on the parent process main thread
	351	parent_main_ptr = hal_remote_lpt(XPTR(parent_cxy,&parent_ptr->th_tbl[0]));
	352	parent_main_xp = XPTR( parent_cxy , parent_main_ptr );
	353
	354	// transfer TXT ownership
	355	process_txt_transfer_ownership( owner_xp );
	356
	357	// block all threads in all clusters, but the main thread
[436]	358	process_sigaction( owner_pid , BLOCK_ALL_THREADS );
[424]	359
[446]	360	// block the main thread
	361	xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] );
	362	thread_block( main_xp , THREAD_BLOCKED_GLOBAL );
	363
[436]	364	// atomically update owner process termination state
	365	hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) ,
	366	PROCESS_TERM_STOP );
[446]	367
	368	// take the children lock and unblock the parent process main thread
	369	remote_spinlock_lock( children_lock_xp );
	370	thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT );
	371	remote_spinlock_unlock( children_lock_xp );
	372
[436]	373	return;
	374	}
	375	}
	376
[446]	377	// filter special character ^C => kill TXT owner process
[436]	378	if( byte == 0x03 )
	379	{
[446]	380
	381	#if DEBUG_HAL_TXT_RX
	382	if( DEBUG_HAL_TXT_RX < rx_cycle )
	383	printk("\n[DBG] %s : read ^C character from TXT%d\n", __FUNCTION__, channel );
	384	#endif
[440]	385	// get pointer on TXT owner process in owner cluster
[436]	386	owner_xp = process_txt_get_owner( channel );
	387
	388	// check process exist
	389	assert( (owner_xp != XPTR_NULL) , __FUNCTION__,
	390	"TXT owner process not found\n" );
	391
	392	// get relevant infos on TXT owner process
	393	owner_cxy = GET_CXY( owner_xp );
	394	owner_ptr = GET_PTR( owner_xp );
	395	owner_pid = hal_remote_lw( XPTR( owner_cxy , &owner_ptr->pid ) );
	396
[446]	397	// kill TXT owner process only if it is not the INIT process
[436]	398	if( owner_pid != 1 )
	399	{
[446]	400	// get parent process descriptor pointers
	401	parent_xp = hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->parent_xp ) );
	402	parent_cxy = GET_CXY( parent_xp );
	403	parent_ptr = GET_PTR( parent_xp );
	404
	405	// get extended pointer on lock protecting children list in parent process
	406	children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock );
	407
	408	// get pointers on the parent process main thread
	409	parent_main_ptr = hal_remote_lpt(XPTR(parent_cxy,&parent_ptr->th_tbl[0]));
	410	parent_main_xp = XPTR( parent_cxy , parent_main_ptr );
	411
[436]	412	// remove process from TXT list
	413	process_txt_detach( owner_xp );
	414
[440]	415	// mark for delete all thread in all clusters, but the main
[436]	416	process_sigaction( owner_pid , DELETE_ALL_THREADS );
[435]	417
[446]	418	// block main thread
[436]	419	xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] );
	420	thread_block( main_xp , THREAD_BLOCKED_GLOBAL );
[435]	421
[436]	422	// atomically update owner process termination state
	423	hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) ,
	424	PROCESS_TERM_KILL );
[446]	425
	426	// take the children lock and unblock the parent process main thread
	427	remote_spinlock_lock( children_lock_xp );
	428	thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT );
	429	remote_spinlock_unlock( children_lock_xp );
	430
[436]	431	return;
	432	}
	433	}
[424]	434
[436]	435	// write byte in TTY_RX FIFO if not full / discard byte if full
	436	if ( fifo->sts < TTY_FIFO_DEPTH )
	437	{
[446]	438
	439	#if DEBUG_HAL_TXT_RX
	440	if( DEBUG_HAL_TXT_RX < rx_cycle )
[451]	441	printk("\n[DBG] %s : put character <%c> to TXT%d_RX fifo\n",
	442	__FUNCTION__, byte, channel );
[446]	443	#endif
[436]	444	// store byte into FIFO
	445	fifo->data[fifo->ptw] = (char)byte;
	446
	447	// avoid race
	448	hal_fence();
	449
	450	// update RX_FIFO state
	451	fifo->ptw = (fifo->ptw + 1) % TTY_FIFO_DEPTH;
	452	hal_atomic_add( &fifo->sts , 1 );
	453
	454	// unblock TXT_RX server thread
	455	thread_unblock( XPTR( local_cxy , server ) , THREAD_BLOCKED_ISR );
	456
[457]	457	// send IPI to core running server thread if required
	458	if( server_lid != CURRENT_THREAD->core->lid )
	459	{
	460	dev_pic_send_ipi( local_cxy , server_lid );
	461	}
[436]	462	}
	463	else
	464	{
	465	printk("\n[WARNING] %s : TTY_RX_FIFO[%d] full => discard character <%x>\n",
	466	__FUNCTION__, channel, (uint32_t)byte );
	467	}
	468	} // end while TTY_READ register full
	469
	470	} // end RX
	471
	472	/////////////////////// handle TX /////////////////////////////
	473	else
[424]	474	{
[436]	475	fifo = &tty_tx_fifo[channel];
	476
	477	// try to move bytes until TX_FIFO empty
	478	while( fifo->sts > 0 )
[424]	479	{
[446]	480	// write one byte to TTY_WRITE register if empty / exit loop if full
[436]	481	if( (hal_remote_lw( status_xp ) & TTY_STATUS_TX_FULL) == 0 )
[424]	482	{
[436]	483	// get one byte from TX_FIFO
	484	byte = fifo->data[fifo->ptr];
[424]	485
[446]	486	#if DEBUG_HAL_TXT_TX
	487	if( DEBUG_HAL_TXT_TX < tx_cycle )
[451]	488	printk("\n[DBG] %s : get character <%c> from TXT%d_TX fifo\n",
	489	__FUNCTION__, byte, channel );
[446]	490	#endif
[436]	491	// update TX_FIFO state
	492	fifo->ptr = (fifo->ptr + 1) % TTY_FIFO_DEPTH;
	493	hal_atomic_add( &fifo->sts , -1 );
	494
	495	// write byte to TTY_WRITE register & acknowledge TX_IRQ
[424]	496	hal_remote_sb( write_xp , byte );
	497	}
	498	}
	499
[435]	500	// disable TX_IRQ
	501	hal_remote_sw( XPTR( tty_cxy , base + TTY_TX_IRQ_ENABLE ) , 0 );
[424]	502
[436]	503	// unblock TXT_TX server thread
	504	thread_unblock( XPTR( local_cxy , server ) , THREAD_BLOCKED_ISR );
[424]	505
[457]	506	// send IPI to core running server thread if required
	507	if( server_lid != CURRENT_THREAD->core->lid )
	508	{
	509	dev_pic_send_ipi( local_cxy , server_lid );
	510	}
[446]	511
[436]	512	} // end TX
	513
[435]	514	hal_fence();
[424]	515
[438]	516	#if (DEBUG_SYS_READ & 1)
[436]	517	if( is_rx ) exit_tty_isr_read = (uint32_t)hal_get_cycles();
[424]	518	#endif
	519
[438]	520	#if (DEBUG_SYS_WRITE & 1)
[436]	521	if( is_rx == 0 ) exit_tty_isr_write = (uint32_t)hal_get_cycles();
[435]	522	#endif
	523
[424]	524	} // end soclib_tty_isr()
	525
[436]	526	/////////////////////////////////////////////////////////////
	527	void __attribute__ ((noinline)) soclib_tty_aux( void * args )
	528	{
	529	uint32_t status;
	530	bool_t empty;
	531	uint32_t i;
	532
	533	xptr_t dev_xp = ((txt_sync_args_t *)args)->dev_xp;
	534	char * buffer = ((txt_sync_args_t *)args)->buffer;
	535	uint32_t count = ((txt_sync_args_t *)args)->count;
	536
	537	// get TXT0 chdev cluster and local pointer
	538	cxy_t dev_cxy = GET_CXY( dev_xp );
	539	chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
	540
	541	// get extended pointer on TTY channel base address
	542	xptr_t tty_xp = (xptr_t)hal_remote_lwd( XPTR( dev_cxy , &dev_ptr->base ) );
	543
	544	// get TTY channel segment cluster and local pointer
	545	cxy_t tty_cxy = GET_CXY( tty_xp );
	546	uint32_t * tty_ptr = (uint32_t *)GET_PTR( tty_xp );
	547
	548	// get extended pointers on TTY_WRITE & TTY_STATUS registers
	549	xptr_t write_xp = XPTR( tty_cxy , tty_ptr + TTY_WRITE );
	550	xptr_t status_xp = XPTR( tty_cxy , tty_ptr + TTY_STATUS );
	551
	552	// loop on characters (busy waiting policy)
	553	for( i = 0 ; i < count ; i++ )
	554	{
	555	do
	556	{
	557	// get TTY_STATUS
	558	status = hal_remote_lw( status_xp );
	559	empty = ( (status & TTY_STATUS_TX_FULL) == 0 );
	560
	561	// transfer one byte if TX buffer empty
	562	if ( empty ) hal_remote_sb( write_xp , buffer[i] );
	563	}
	564	while ( empty == false );
	565	}
	566	} // end soclib_tty_aux()
	567
	568
	569

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