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source: trunk/kernel/fs/devfs.c@ 608

Last change on this file since 608 was 602, checked in by alain, 8 years ago
Improve the FAT32 file system to support cat, rm, cp commands.
File size: 20.8 KB

Rev	Line
[23]	1	/*
	2	* devfs.c - DEVFS File system API implementation.
	3	*
	4	* Author Mohamed Lamine Karaoui (2014,2015)
	5	* Alain Greiner (2016,2017)
	6	*
	7	* Copyright (c) Sorbonne Universites
	8	*
	9	* This file is part of ALMOS-MKH.
	10	*
	11	* ALMOS-MKH is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; version 2.0 of the License.
	14	*
	15	* ALMOS-MKH is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
	22	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	23	*/
	24
[457]	25	#include <hal_kernel_types.h>
[23]	26	#include <hal_special.h>
[407]	27	#include <hal_uspace.h>
[23]	28	#include <printk.h>
	29	#include <chdev.h>
[433]	30	#include <thread.h>
[407]	31	#include <dev_txt.h>
[188]	32	#include <cluster.h>
[23]	33	#include <vfs.h>
[188]	34	#include <kmem.h>
[23]	35	#include <devfs.h>
	36
[188]	37	/////////////////////////////////////////////////////////////////////////////////////////
	38	// Extern variables
	39	/////////////////////////////////////////////////////////////////////////////////////////
[23]	40
[188]	41	extern vfs_ctx_t fs_context[]; // allocated in kernel_init.c
	42	extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
[23]	43
[438]	44	#if (DEBUG_SYS_READ & 1)
[435]	45	extern uint32_t enter_devfs_read;
	46	extern uint32_t exit_devfs_read;
[407]	47	#endif
	48
[438]	49	#if (DEBUG_SYS_WRITE & 1)
[435]	50	extern uint32_t enter_devfs_write;
	51	extern uint32_t exit_devfs_write;
	52	#endif
	53
[568]	54	/////////////////////////////////////
[484]	55	devfs_ctx_t * devfs_ctx_alloc( void )
[188]	56	{
	57	kmem_req_t req;
[23]	58
[188]	59	req.type = KMEM_DEVFS_CTX;
	60	req.size = sizeof(devfs_ctx_t);
	61	req.flags = AF_KERNEL \| AF_ZERO;
[23]	62
[188]	63	return (devfs_ctx_t *)kmem_alloc( &req );
	64	}
[23]	65
[188]	66	/////////////////////////////////////////////
	67	void devfs_ctx_init( devfs_ctx_t * devfs_ctx,
[204]	68	xptr_t devfs_dev_inode_xp,
[188]	69	xptr_t devfs_external_inode_xp )
[23]	70	{
[204]	71	devfs_ctx->dev_inode_xp = devfs_dev_inode_xp;
[188]	72	devfs_ctx->external_inode_xp = devfs_external_inode_xp;
[23]	73
[188]	74	fs_context[FS_TYPE_DEVFS].extend = devfs_ctx;
	75	}
[23]	76
[188]	77	/////////////////////////////////////////////////
	78	void devfs_ctx_destroy( devfs_ctx_t * devfs_ctx )
	79	{
	80	kmem_req_t req;
[23]	81
[188]	82	req.type = KMEM_DEVFS_CTX;
	83	req.ptr = devfs_ctx;
	84	kmem_free( &req );
	85	}
[23]	86
[437]	87	/////////////////////////////////////////////////
[602]	88	void devfs_global_init( xptr_t root_inode_xp,
[204]	89	xptr_t * devfs_dev_inode_xp,
[188]	90	xptr_t * devfs_external_inode_xp )
[23]	91	{
	92	error_t error;
[602]	93	xptr_t unused_xp; // required by vfs_add_child_in_parent()
[23]	94
[457]	95	// creates DEVFS "dev" inode in cluster 0
	96	error = vfs_add_child_in_parent( 0, // cxy
[188]	97	INODE_TYPE_DIR,
	98	FS_TYPE_DEVFS,
[602]	99	root_inode_xp,
[188]	100	"dev",
[602]	101	&unused_xp,
	102	devfs_dev_inode_xp );
[23]	103
[492]	104	assert( (error == 0) , "cannot create <dev>\n" );
[23]	105
[568]	106	#if DEBUG_DEVFS_INIT
[598]	107	uint32_t cycle = (uint32_t)hal_get_cycles();
	108	thread_t * this = CURRENT_THREAD;
[438]	109	if( DEBUG_DEVFS_INIT < cycle )
[598]	110	printk("\n[%s] thread[%x,%x] created <dev> inode / cycle %d\n",
	111	__FUNCTION__, this->process->pid, this->trdid, cycle );
[437]	112	#endif
	113
[457]	114	// create DEVFS "external" inode in cluster 0
	115	error = vfs_add_child_in_parent( 0, // cxy
[188]	116	INODE_TYPE_DIR,
	117	FS_TYPE_DEVFS,
[204]	118	*devfs_dev_inode_xp,
	119	"external",
[602]	120	&unused_xp,
	121	devfs_external_inode_xp );
[23]	122
[492]	123	assert( (error == 0) , "cannot create <external>\n" );
[279]	124
[438]	125	#if DEBUG_DEVFS_INIT
[433]	126	cycle = (uint32_t)hal_get_cycles();
[438]	127	if( DEBUG_DEVFS_INIT < cycle )
[598]	128	printk("\n[%s] thread[%x,%x] created <external> inode / cycle %d\n",
	129	__FUNCTION__, this->process->pid, this->trdid, cycle );
[433]	130	#endif
	131
[602]	132	} // end devfs_global_init()
[23]	133
[204]	134	///////////////////////////////////////////////////
	135	void devfs_local_init( xptr_t devfs_dev_inode_xp,
	136	xptr_t devfs_external_inode_xp,
	137	xptr_t * devfs_internal_inode_xp )
[23]	138	{
	139	char node_name[16];
[188]	140	xptr_t chdev_xp;
	141	cxy_t chdev_cxy;
[407]	142	chdev_t * chdev_ptr;
[188]	143	xptr_t inode_xp;
[602]	144	cxy_t inode_cxy;
	145	vfs_inode_t * inode_ptr;
[23]	146	uint32_t channel;
[602]	147	xptr_t unused_xp; // required by add_child_in_parent()
[23]	148
[568]	149	// create "internal" directory
[188]	150	snprintf( node_name , 16 , "internal_%x" , local_cxy );
	151	vfs_add_child_in_parent( local_cxy,
	152	INODE_TYPE_DIR,
	153	FS_TYPE_DEVFS,
[204]	154	devfs_dev_inode_xp,
[188]	155	node_name,
[602]	156	&unused_xp,
[204]	157	devfs_internal_inode_xp );
[568]	158	#if DEBUG_DEVFS_INIT
[598]	159	uint32_t cycle = (uint32_t)hal_get_cycles();
	160	thread_t * this = CURRENT_THREAD;
[568]	161	if( DEBUG_DEVFS_INIT < cycle )
[598]	162	printk("\n[%s] thread[%x,%x] created <%s> inode in cluster %x / cycle %d\n",
	163	__FUNCTION__, this->process->pid, this->trdid, node_name, local_cxy, cycle );
[568]	164	#endif
[23]	165
	166	// create MMC chdev inode
[407]	167	chdev_xp = chdev_dir.mmc[local_cxy];
[188]	168	if( chdev_xp != XPTR_NULL)
	169	{
[602]	170	chdev_ptr = GET_PTR( chdev_xp );
[188]	171	vfs_add_child_in_parent( local_cxy,
	172	INODE_TYPE_DEV,
	173	FS_TYPE_DEVFS,
[204]	174	*devfs_internal_inode_xp,
[407]	175	chdev_ptr->name,
[602]	176	&unused_xp,
[188]	177	&inode_xp );
[602]	178
	179	// update child inode "extend" field
	180	inode_cxy = GET_CXY( inode_xp );
	181	inode_ptr = GET_PTR( inode_xp );
	182	hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
	183
[568]	184	#if DEBUG_DEVFS_INIT
	185	cycle = (uint32_t)hal_get_cycles();
	186	if( DEBUG_DEVFS_INIT < cycle )
[598]	187	printk("\n[%s] thread[%x,%x] created <mmc> inode in cluster %x\n",
	188	__FUNCTION__, this->process->pid, this->trdid, local_cxy, cycle );
[568]	189	#endif
	190
[188]	191	}
[23]	192
	193	// create DMA chdev inodes (one DMA channel per core)
[188]	194	for( channel = 0 ; channel < LOCAL_CLUSTER->cores_nr ; channel++ )
[23]	195	{
[602]	196	chdev_xp = chdev_dir.dma[channel];
[188]	197	if( chdev_xp != XPTR_NULL)
	198	{
[602]	199	chdev_ptr = GET_PTR( chdev_xp );
[188]	200	vfs_add_child_in_parent( local_cxy,
	201	INODE_TYPE_DEV,
	202	FS_TYPE_DEVFS,
[204]	203	*devfs_internal_inode_xp,
[407]	204	chdev_ptr->name,
[602]	205	&unused_xp,
[188]	206	&inode_xp );
[602]	207
	208	// update child inode "extend" field
	209	inode_cxy = GET_CXY( inode_xp );
	210	inode_ptr = GET_PTR( inode_xp );
	211	hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
	212
[568]	213	#if DEBUG_DEVFS_INIT
	214	cycle = (uint32_t)hal_get_cycles();
	215	if( DEBUG_DEVFS_INIT < cycle )
[598]	216	printk("\n[%s] thread [%x,%x] created <dma[%d]> inode in cluster %x\n",
	217	__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
[568]	218	#endif
[188]	219	}
[23]	220	}
	221
[188]	222	// create an IOB inode in cluster containing IOB chdev
	223	chdev_xp = chdev_dir.iob;
	224	if( chdev_xp != XPTR_NULL )
[23]	225	{
[188]	226	chdev_cxy = GET_CXY( chdev_xp );
[602]	227	chdev_ptr = GET_PTR( chdev_xp );
[188]	228	if( chdev_cxy == local_cxy )
	229	{
	230	vfs_add_child_in_parent( local_cxy,
	231	INODE_TYPE_DEV,
	232	FS_TYPE_DEVFS,
	233	devfs_external_inode_xp,
[407]	234	chdev_ptr->name,
[602]	235	&unused_xp,
[188]	236	&inode_xp );
[602]	237
	238	// update child inode "extend" field
	239	inode_cxy = GET_CXY( inode_xp );
	240	inode_ptr = GET_PTR( inode_xp );
	241	hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
	242
[568]	243	#if DEBUG_DEVFS_INIT
	244	cycle = (uint32_t)hal_get_cycles();
	245	if( DEBUG_DEVFS_INIT < cycle )
[598]	246	printk("\n[%s] thread[%x,%x] created <iob> inode in cluster %x\n",
	247	__FUNCTION__, this->process->pid, this->trdid, local_cxy, cycle );
[568]	248	#endif
[188]	249	}
	250	}
[23]	251
[188]	252	// create a PIC inode in cluster containing PIC chdev
	253	chdev_xp = chdev_dir.pic;
	254	if( chdev_xp != XPTR_NULL )
	255	{
	256	chdev_cxy = GET_CXY( chdev_xp );
[602]	257	chdev_ptr = GET_PTR( chdev_xp );
[188]	258	if( chdev_cxy == local_cxy )
[23]	259	{
[188]	260	vfs_add_child_in_parent( local_cxy,
	261	INODE_TYPE_DEV,
	262	FS_TYPE_DEVFS,
	263	devfs_external_inode_xp,
[407]	264	chdev_ptr->name,
[602]	265	&unused_xp,
[188]	266	&inode_xp );
[602]	267
	268	// update child inode "extend" field
	269	inode_cxy = GET_CXY( inode_xp );
	270	inode_ptr = GET_PTR( inode_xp );
	271	hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
	272
[568]	273	#if DEBUG_DEVFS_INIT
	274	cycle = (uint32_t)hal_get_cycles();
	275	if( DEBUG_DEVFS_INIT < cycle )
[598]	276	printk("\n[%s] thread[%x,%x] created <pic> inode in cluster %x\n",
	277	__FUNCTION__, this->process->pid, this->trdid, local_cxy, cycle );
[568]	278	#endif
[23]	279	}
[188]	280	}
[23]	281
[407]	282	// create a TXT_RX inode in each cluster containing a TXT_RX chdev
[188]	283	for( channel = 0 ; channel < CONFIG_MAX_TXT_CHANNELS ; channel++ )
	284	{
[407]	285	chdev_xp = chdev_dir.txt_rx[channel];
[188]	286	if( chdev_xp != XPTR_NULL )
[23]	287	{
[188]	288	chdev_cxy = GET_CXY( chdev_xp );
[602]	289	chdev_ptr = GET_PTR( chdev_xp );
[188]	290	if( chdev_cxy == local_cxy )
	291	{
	292	vfs_add_child_in_parent( local_cxy,
	293	INODE_TYPE_DEV,
	294	FS_TYPE_DEVFS,
	295	devfs_external_inode_xp,
[407]	296	chdev_ptr->name,
[602]	297	&unused_xp,
[188]	298	&inode_xp );
[602]	299
	300	// update child inode "extend" field
	301	inode_cxy = GET_CXY( inode_xp );
	302	inode_ptr = GET_PTR( inode_xp );
	303	hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
	304
[568]	305	#if DEBUG_DEVFS_INIT
	306	cycle = (uint32_t)hal_get_cycles();
	307	if( DEBUG_DEVFS_INIT < cycle )
[598]	308	printk("\n[%s] thread[%x,%x] created <txt_rx[%d]> inode in cluster %x\n",
	309	__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
[568]	310	#endif
[188]	311	}
[23]	312	}
[188]	313	}
[23]	314
[407]	315	// create a TXT_TX inode in each cluster containing a TXT_TX chdev
	316	for( channel = 0 ; channel < CONFIG_MAX_TXT_CHANNELS ; channel++ )
	317	{
	318	chdev_xp = chdev_dir.txt_tx[channel];
	319	if( chdev_xp != XPTR_NULL )
	320	{
	321	chdev_cxy = GET_CXY( chdev_xp );
[602]	322	chdev_ptr = GET_PTR( chdev_xp );
[407]	323	if( chdev_cxy == local_cxy )
	324	{
	325	vfs_add_child_in_parent( local_cxy,
	326	INODE_TYPE_DEV,
	327	FS_TYPE_DEVFS,
	328	devfs_external_inode_xp,
	329	chdev_ptr->name,
[602]	330	&unused_xp,
[407]	331	&inode_xp );
[602]	332
	333	// update child inode "extend" field
	334	inode_cxy = GET_CXY( inode_xp );
	335	inode_ptr = GET_PTR( inode_xp );
	336	hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
	337
[568]	338	#if DEBUG_DEVFS_INIT
	339	cycle = (uint32_t)hal_get_cycles();
	340	if( DEBUG_DEVFS_INIT < cycle )
[598]	341	printk("\n[%s] thread[%x,%x] created <txt_tx[%d]> inode in cluster %x\n",
	342	__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
[568]	343	#endif
[407]	344	}
	345	}
	346	}
	347
[188]	348	// create an IOC inode in each cluster containing an IOC chdev
	349	for( channel = 0 ; channel < CONFIG_MAX_IOC_CHANNELS ; channel++ )
	350	{
	351	chdev_xp = chdev_dir.ioc[channel];
	352	if( chdev_xp != XPTR_NULL )
[23]	353	{
[188]	354	chdev_cxy = GET_CXY( chdev_xp );
[602]	355	chdev_ptr = GET_PTR( chdev_xp );
[188]	356	if( chdev_cxy == local_cxy )
	357	{
	358	vfs_add_child_in_parent( local_cxy,
	359	INODE_TYPE_DEV,
	360	FS_TYPE_DEVFS,
	361	devfs_external_inode_xp,
[407]	362	chdev_ptr->name,
[602]	363	&unused_xp,
[188]	364	&inode_xp );
[602]	365
	366	// update child inode "extend" field
	367	inode_cxy = GET_CXY( inode_xp );
	368	inode_ptr = GET_PTR( inode_xp );
	369	hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
	370
[568]	371	#if DEBUG_DEVFS_INIT
	372	cycle = (uint32_t)hal_get_cycles();
	373	if( DEBUG_DEVFS_INIT < cycle )
[598]	374	printk("\n[%s] thread[%x,%x] created <ioc[%d]> inode in cluster %x\n",
	375	__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
[568]	376	#endif
[188]	377	}
[23]	378	}
[188]	379	}
[23]	380
[188]	381	// create a FBF inode in each cluster containing a FBF chdev
[568]	382	for( channel = 0 ; channel < CONFIG_MAX_FBF_CHANNELS ; channel++ )
[188]	383	{
	384	chdev_xp = chdev_dir.fbf[channel];
	385	if( chdev_xp != XPTR_NULL )
[23]	386	{
[188]	387	chdev_cxy = GET_CXY( chdev_xp );
[602]	388	chdev_ptr = GET_PTR( chdev_xp );
[188]	389	if( chdev_cxy == local_cxy )
	390	{
	391	vfs_add_child_in_parent( local_cxy,
	392	INODE_TYPE_DEV,
	393	FS_TYPE_DEVFS,
	394	devfs_external_inode_xp,
[407]	395	chdev_ptr->name,
[602]	396	&unused_xp,
[188]	397	&inode_xp );
[602]	398
	399	// update child inode "extend" field
	400	inode_cxy = GET_CXY( inode_xp );
	401	inode_ptr = GET_PTR( inode_xp );
	402	hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
	403
[568]	404	#if DEBUG_DEVFS_INIT
	405	cycle = (uint32_t)hal_get_cycles();
	406	if( DEBUG_DEVFS_INIT < cycle )
[598]	407	printk("\n[%s] thread[%x,%x] created <fbf[%d]> inode in cluster %x\n",
	408	__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
[568]	409	#endif
[188]	410	}
[23]	411	}
[188]	412	}
[23]	413
[188]	414	// create a NIC_RX inode in each cluster containing a NIC_RX chdev
	415	for( channel = 0 ; channel < CONFIG_MAX_NIC_CHANNELS ; channel++ )
	416	{
	417	chdev_xp = chdev_dir.nic_rx[channel];
	418	if( chdev_xp != XPTR_NULL )
[23]	419	{
[188]	420	chdev_cxy = GET_CXY( chdev_xp );
[407]	421	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
[188]	422	if( chdev_cxy == local_cxy )
	423	{
	424	vfs_add_child_in_parent( local_cxy,
	425	INODE_TYPE_DEV,
	426	FS_TYPE_DEVFS,
	427	devfs_external_inode_xp,
[407]	428	chdev_ptr->name,
[602]	429	&unused_xp,
[188]	430	&inode_xp );
[568]	431	#if DEBUG_DEVFS_INIT
	432	cycle = (uint32_t)hal_get_cycles();
	433	if( DEBUG_DEVFS_INIT < cycle )
[598]	434	printk("\n[%s] thread[%x,%x] created <nic_rx[%d]> inode in cluster %x\n",
	435	__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
[568]	436	#endif
[188]	437	}
[23]	438	}
	439	}
	440
[188]	441	// create a NIC_TX inode in each cluster containing a NIC_TX chdev
	442	for( channel = 0 ; channel < CONFIG_MAX_NIC_CHANNELS ; channel++ )
[23]	443	{
[188]	444	chdev_xp = chdev_dir.nic_tx[channel];
	445	if( chdev_xp != XPTR_NULL )
	446	{
	447	chdev_cxy = GET_CXY( chdev_xp );
[602]	448	chdev_ptr = GET_PTR( chdev_xp );
[188]	449	if( chdev_cxy == local_cxy )
	450	{
	451	vfs_add_child_in_parent( local_cxy,
	452	INODE_TYPE_DEV,
	453	FS_TYPE_DEVFS,
	454	devfs_external_inode_xp,
[407]	455	chdev_ptr->name,
[602]	456	&unused_xp,
[188]	457	&inode_xp );
[602]	458
	459	// update child inode "extend" field
	460	inode_cxy = GET_CXY( inode_xp );
	461	inode_ptr = GET_PTR( inode_xp );
	462	hal_remote_spt( XPTR( inode_cxy , &inode_ptr->extend ) , chdev_ptr );
	463
[438]	464	#if DEBUG_DEVFS_INIT
[433]	465	cycle = (uint32_t)hal_get_cycles();
[438]	466	if( DEBUG_DEVFS_INIT < cycle )
[598]	467	printk("\n[%s] thread[%x,%x] created <nic_tx[%d]> inode in cluster %x\n",
	468	__FUNCTION__, this->process->pid, this->trdid, channel, local_cxy, cycle );
[433]	469	#endif
[568]	470	}
	471	}
	472	}
[188]	473	} // end devfs_local_init()
[23]	474
[407]	475	//////////////////////////////////////////
	476	int devfs_user_move( bool_t to_buffer,
	477	xptr_t file_xp,
[598]	478	char * u_buf,
[407]	479	uint32_t size )
	480	{
[598]	481	xptr_t chdev_xp;
	482	cxy_t chdev_cxy;
	483	chdev_t * chdev_ptr; // associated chdev type
	484	uint32_t func; // chdev functionnal type
	485	uint32_t channel; // chdev channel index
	486	uint32_t burst; // number of bytes in a burst
	487	uint32_t todo; // number of bytes not yet moved
	488	error_t error;
	489	uint32_t i;
[407]	490
[598]	491	char k_buf[CONFIG_TXT_KBUF_SIZE]; // local kernel buffer
[407]	492
[598]	493	assert( ( file_xp != XPTR_NULL ) , "file_xp == XPTR_NULL" );
[407]	494
[438]	495	#if (DEBUG_SYS_READ & 1)
[435]	496	enter_devfs_read = hal_time_stamp();
	497	#endif
	498
[438]	499	#if (DEBUG_SYS_WRITE & 1)
[435]	500	enter_devfs_write = hal_time_stamp();
	501	#endif
	502
[438]	503	#if DEBUG_DEVFS_MOVE
[598]	504	uint32_t cycle = (uint32_t)hal_get_cycles();
	505	thread_t * this = CURRENT_THREAD;
[438]	506	if( DEBUG_DEVFS_MOVE < cycle )
[598]	507	printk("\n[%s] thread[%x,%x] enter / to_mem %d / cycle %d\n",
	508	__FUNCTION__, this->process->pid, this->trdid, to_buffer, cycle );
[433]	509	#endif
[407]	510
[430]	511	// get extended pointer on chdev_xp
	512	chdev_xp = chdev_from_file( file_xp );
[407]	513
[430]	514	// get cluster and local pointer on chdev
	515	chdev_cxy = GET_CXY( chdev_xp );
	516	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
[407]	517
	518	// get chdev functionnal type and channel
[568]	519	func = hal_remote_l32( XPTR( chdev_cxy , &chdev_ptr->func ) );
	520	channel = hal_remote_l32( XPTR( chdev_cxy , &chdev_ptr->channel ) );
[407]	521
[602]	522	// Only TXT devices are associated to a pseudo-file
[598]	523	assert( ( func == DEV_FUNC_TXT ) , __FUNCTION__, "illegal device func_type");
	524
	525	// initialise number of bytes to move
	526	todo = size;
	527
	528	/////////////// TXT read
	529	if( to_buffer )
	530	{
	531	while( todo )
	532	{
	533	// set burst size
	534	if( todo > CONFIG_TXT_KBUF_SIZE ) burst = CONFIG_TXT_KBUF_SIZE;
	535	else burst = todo;
	536
	537	// read burst bytes from TXT device to kernel buffer
	538	for( i = 0 ; i < burst ; i++ )
[407]	539	{
	540	error = dev_txt_read( channel , &k_buf[i] );
	541
[598]	542	if( error ) return -1;
	543	}
[407]	544
[598]	545	// move burst bytes from k_buf to u_buf
	546	hal_strcpy_to_uspace( u_buf , k_buf , burst );
	547
	548	// update loop variables
	549	todo -= burst;
	550	u_buf += burst;
	551	}
	552
[438]	553	#if DEBUG_DEVFS_MOVE
[433]	554	cycle = (uint32_t)hal_get_cycles();
[438]	555	if( DEBUG_DEVFS_MOVE < cycle )
[598]	556	printk("\n[%s] thread[%x,%x] exit / to_mem %d / cycle %d\n",
	557	__FUNCTION__, this->process->pid, this->trdid, to_buffer, cycle );
[433]	558	#endif
	559
[438]	560	#if (DEBUG_SYS_READ & 1)
[435]	561	exit_devfs_read = hal_time_stamp();
[407]	562	#endif
	563	return size;
[598]	564	}
	565	///////////// TXT write
	566	else
	567	{
	568	while( todo )
[407]	569	{
[598]	570	// set burst size
	571	if( todo > CONFIG_TXT_KBUF_SIZE ) burst = CONFIG_TXT_KBUF_SIZE;
	572	else burst = todo;
[407]	573
[598]	574	// move burst bytes from u_buf to k_buf
	575	hal_strcpy_from_uspace( k_buf , u_buf , burst );
[407]	576
[598]	577	// write burst bytes from kernel buffer to TXT device
	578	error = dev_txt_write( channel , k_buf , burst );
	579
	580	if( error ) return -1;
	581
	582	// update loop variables
	583	todo -= burst;
	584	u_buf += burst;
	585	}
	586
[438]	587	#if DEBUG_DEVFS_MOVE
[433]	588	cycle = (uint32_t)hal_get_cycles();
[438]	589	if( DEBUG_DEVFS_MOVE < cycle )
[598]	590	printk("\n[%s] thread[%x,%x] exit / to_mem %d / cycle %d\n",
	591	__FUNCTION__, this->process->pid, this->trdid, to_buffer, cycle );
[433]	592	#endif
[407]	593
[438]	594	#if (DEBUG_SYS_WRITE & 1)
[435]	595	exit_devfs_write = hal_time_stamp();
	596	#endif
[598]	597	return size;
[407]	598	}
	599
	600	} // end devfs_user_move()
	601
	602

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