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source: trunk/kernel/fs/devfs.c @ 479

Last change on this file since 479 was 457, checked in by alain, 6 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: 15.8 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
[188]	54	///////////////////////////////
	55	devfs_ctx_t * devfs_ctx_alloc()
	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	/////////////////////////////////////////////////
[188]	88	void devfs_global_init( xptr_t parent_inode_xp,
[204]	89	xptr_t * devfs_dev_inode_xp,
[188]	90	xptr_t * devfs_external_inode_xp )
[23]	91	{
	92	error_t error;
	93
[438]	94	#if DEBUG_DEVFS_INIT
[433]	95	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	96	if( DEBUG_DEVFS_INIT < cycle )
[433]	97	printk("\n[DBG] %s : thread %x enter at cycle %d\n",
	98	__FUNCTION__ , CURRENT_THREAD , cycle );
	99	#endif
[279]	100
[457]	101	// creates DEVFS "dev" inode in cluster 0
	102	error = vfs_add_child_in_parent( 0, // cxy
[188]	103	INODE_TYPE_DIR,
	104	FS_TYPE_DEVFS,
	105	parent_inode_xp,
	106	"dev",
	107	NULL,
[204]	108	devfs_dev_inode_xp );
[23]	109
[279]	110	assert( (error == 0) , __FUNCTION__ , "cannot create <dev>\n" );
[23]	111
[438]	112	#if( DEBUG_DEVFS_INIT & 1 )
	113	if( DEBUG_DEVFS_INIT < cycle )
[437]	114	printk("\n[DBG] %s : created <dev> inode at cycle %d\n", __FUNCTION__, cycle );
	115	#endif
	116
[457]	117	// create DEVFS "external" inode in cluster 0
	118	error = vfs_add_child_in_parent( 0, // cxy
[188]	119	INODE_TYPE_DIR,
	120	FS_TYPE_DEVFS,
[204]	121	*devfs_dev_inode_xp,
	122	"external",
[188]	123	NULL,
	124	devfs_external_inode_xp );
[23]	125
[279]	126	assert( (error == 0) , __FUNCTION__ , "cannot create <external>\n" );
	127
[438]	128	#if DEBUG_DEVFS_INIT
[433]	129	cycle = (uint32_t)hal_get_cycles();
[438]	130	if( DEBUG_DEVFS_INIT < cycle )
[433]	131	printk("\n[DBG] %s : thread %x exit at cycle %d\n",
	132	__FUNCTION__ , CURRENT_THREAD , cycle );
	133	#endif
	134
[188]	135	}
[23]	136
[204]	137	///////////////////////////////////////////////////
	138	void devfs_local_init( xptr_t devfs_dev_inode_xp,
	139	xptr_t devfs_external_inode_xp,
	140	xptr_t * devfs_internal_inode_xp )
[23]	141	{
	142	char node_name[16];
[188]	143	xptr_t chdev_xp;
	144	cxy_t chdev_cxy;
[407]	145	chdev_t * chdev_ptr;
[188]	146	xptr_t inode_xp;
[23]	147	uint32_t channel;
	148
[438]	149	#if DEBUG_DEVFS_INIT
[433]	150	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	151	if( DEBUG_DEVFS_INIT < cycle )
[433]	152	printk("\n[DBG] %s : thread %x enter at cycle %d\n",
	153	__FUNCTION__ , CURRENT_THREAD , cycle );
	154	#endif
	155
[188]	156	// create "internal" directory linked to "dev"
	157	snprintf( node_name , 16 , "internal_%x" , local_cxy );
	158	vfs_add_child_in_parent( local_cxy,
	159	INODE_TYPE_DIR,
	160	FS_TYPE_DEVFS,
[204]	161	devfs_dev_inode_xp,
[188]	162	node_name,
	163	NULL,
[204]	164	devfs_internal_inode_xp );
[23]	165
	166	// create MMC chdev inode
[407]	167	chdev_xp = chdev_dir.mmc[local_cxy];
[188]	168	if( chdev_xp != XPTR_NULL)
	169	{
[407]	170	chdev_ptr = (chdev_t *)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,
[188]	176	GET_PTR( chdev_xp ),
	177	&inode_xp );
	178	}
[23]	179
	180	// create DMA chdev inodes (one DMA channel per core)
[188]	181	for( channel = 0 ; channel < LOCAL_CLUSTER->cores_nr ; channel++ )
[23]	182	{
[188]	183	chdev_xp = chdev_dir.dma[channel];
	184	if( chdev_xp != XPTR_NULL)
	185	{
[407]	186	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
[188]	187	vfs_add_child_in_parent( local_cxy,
	188	INODE_TYPE_DEV,
	189	FS_TYPE_DEVFS,
[204]	190	*devfs_internal_inode_xp,
[407]	191	chdev_ptr->name,
[188]	192	GET_PTR( chdev_xp ),
	193	&inode_xp );
	194	}
[23]	195	}
	196
[188]	197	// create an IOB inode in cluster containing IOB chdev
	198	chdev_xp = chdev_dir.iob;
	199	if( chdev_xp != XPTR_NULL )
[23]	200	{
[188]	201	chdev_cxy = GET_CXY( chdev_xp );
[407]	202	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
[188]	203	if( chdev_cxy == local_cxy )
	204	{
	205	vfs_add_child_in_parent( local_cxy,
	206	INODE_TYPE_DEV,
	207	FS_TYPE_DEVFS,
	208	devfs_external_inode_xp,
[407]	209	chdev_ptr->name,
[188]	210	GET_PTR( chdev_xp ),
	211	&inode_xp );
	212	}
	213	}
[23]	214
[188]	215	// create a PIC inode in cluster containing PIC chdev
	216	chdev_xp = chdev_dir.pic;
	217	if( chdev_xp != XPTR_NULL )
	218	{
	219	chdev_cxy = GET_CXY( chdev_xp );
[407]	220	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
[188]	221	if( chdev_cxy == local_cxy )
[23]	222	{
[188]	223	vfs_add_child_in_parent( local_cxy,
	224	INODE_TYPE_DEV,
	225	FS_TYPE_DEVFS,
	226	devfs_external_inode_xp,
[407]	227	chdev_ptr->name,
[188]	228	GET_PTR( chdev_xp ),
	229	&inode_xp );
[23]	230	}
[188]	231	}
[23]	232
[407]	233	// create a TXT_RX inode in each cluster containing a TXT_RX chdev
[188]	234	for( channel = 0 ; channel < CONFIG_MAX_TXT_CHANNELS ; channel++ )
	235	{
[407]	236	chdev_xp = chdev_dir.txt_rx[channel];
[188]	237	if( chdev_xp != XPTR_NULL )
[23]	238	{
[188]	239	chdev_cxy = GET_CXY( chdev_xp );
[407]	240	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
[188]	241	if( chdev_cxy == local_cxy )
	242	{
	243	vfs_add_child_in_parent( local_cxy,
	244	INODE_TYPE_DEV,
	245	FS_TYPE_DEVFS,
	246	devfs_external_inode_xp,
[407]	247	chdev_ptr->name,
[188]	248	GET_PTR( chdev_xp ),
	249	&inode_xp );
	250	}
[23]	251	}
[188]	252	}
[23]	253
[407]	254	// create a TXT_TX inode in each cluster containing a TXT_TX chdev
	255	for( channel = 0 ; channel < CONFIG_MAX_TXT_CHANNELS ; channel++ )
	256	{
	257	chdev_xp = chdev_dir.txt_tx[channel];
	258	if( chdev_xp != XPTR_NULL )
	259	{
	260	chdev_cxy = GET_CXY( chdev_xp );
	261	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
	262	if( chdev_cxy == local_cxy )
	263	{
	264	vfs_add_child_in_parent( local_cxy,
	265	INODE_TYPE_DEV,
	266	FS_TYPE_DEVFS,
	267	devfs_external_inode_xp,
	268	chdev_ptr->name,
	269	GET_PTR( chdev_xp ),
	270	&inode_xp );
	271	}
	272	}
	273	}
	274
[188]	275	// create an IOC inode in each cluster containing an IOC chdev
	276	for( channel = 0 ; channel < CONFIG_MAX_IOC_CHANNELS ; channel++ )
	277	{
	278	chdev_xp = chdev_dir.ioc[channel];
	279	if( chdev_xp != XPTR_NULL )
[23]	280	{
[188]	281	chdev_cxy = GET_CXY( chdev_xp );
[407]	282	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
[188]	283	if( chdev_cxy == local_cxy )
	284	{
	285	vfs_add_child_in_parent( local_cxy,
	286	INODE_TYPE_DEV,
	287	FS_TYPE_DEVFS,
	288	devfs_external_inode_xp,
[407]	289	chdev_ptr->name,
[188]	290	GET_PTR( chdev_xp ),
	291	&inode_xp );
	292	}
[23]	293	}
[188]	294	}
[23]	295
[188]	296	// create a FBF inode in each cluster containing a FBF chdev
	297	for( channel = 0 ; channel < CONFIG_MAX_IOC_CHANNELS ; channel++ )
	298	{
	299	chdev_xp = chdev_dir.fbf[channel];
	300	if( chdev_xp != XPTR_NULL )
[23]	301	{
[188]	302	chdev_cxy = GET_CXY( chdev_xp );
[407]	303	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
[188]	304	if( chdev_cxy == local_cxy )
	305	{
	306	vfs_add_child_in_parent( local_cxy,
	307	INODE_TYPE_DEV,
	308	FS_TYPE_DEVFS,
	309	devfs_external_inode_xp,
[407]	310	chdev_ptr->name,
[188]	311	GET_PTR( chdev_xp ),
	312	&inode_xp );
	313	}
[23]	314	}
[188]	315	}
[23]	316
[188]	317	// create a NIC_RX inode in each cluster containing a NIC_RX chdev
	318	for( channel = 0 ; channel < CONFIG_MAX_NIC_CHANNELS ; channel++ )
	319	{
	320	chdev_xp = chdev_dir.nic_rx[channel];
	321	if( chdev_xp != XPTR_NULL )
[23]	322	{
[188]	323	chdev_cxy = GET_CXY( chdev_xp );
[407]	324	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
[188]	325	if( chdev_cxy == local_cxy )
	326	{
	327	vfs_add_child_in_parent( local_cxy,
	328	INODE_TYPE_DEV,
	329	FS_TYPE_DEVFS,
	330	devfs_external_inode_xp,
[407]	331	chdev_ptr->name,
[188]	332	GET_PTR( chdev_xp ),
	333	&inode_xp );
	334	}
[23]	335	}
	336	}
	337
[188]	338	// create a NIC_TX inode in each cluster containing a NIC_TX chdev
	339	for( channel = 0 ; channel < CONFIG_MAX_NIC_CHANNELS ; channel++ )
[23]	340	{
[188]	341	chdev_xp = chdev_dir.nic_tx[channel];
	342	if( chdev_xp != XPTR_NULL )
	343	{
	344	chdev_cxy = GET_CXY( chdev_xp );
[407]	345	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
[188]	346	if( chdev_cxy == local_cxy )
	347	{
	348	vfs_add_child_in_parent( local_cxy,
	349	INODE_TYPE_DEV,
	350	FS_TYPE_DEVFS,
	351	devfs_external_inode_xp,
[407]	352	chdev_ptr->name,
[188]	353	GET_PTR( chdev_xp ),
	354	&inode_xp );
	355	}
	356	}
[23]	357	}
[433]	358
[438]	359	#if DEBUG_DEVFS_INIT
[433]	360	cycle = (uint32_t)hal_get_cycles();
[438]	361	if( DEBUG_DEVFS_INIT < cycle )
[433]	362	printk("\n[DBG] %s : thread %x exit at cycle %d\n",
	363	__FUNCTION__ , CURRENT_THREAD , cycle );
	364	#endif
	365
[188]	366	} // end devfs_local_init()
[23]	367
[407]	368	//////////////////////////////////////////
	369	int devfs_user_move( bool_t to_buffer,
	370	xptr_t file_xp,
	371	void * u_buf,
	372	uint32_t size )
	373	{
	374	assert( ( file_xp != XPTR_NULL ) , __FUNCTION__ , "file_xp == XPTR_NULL" );
	375
	376	assert( ( size < CONFIG_TXT_KBUF_SIZE ) , __FUNCTION__ , "string size too large" );
	377
[430]	378	xptr_t chdev_xp;
	379	cxy_t chdev_cxy;
[407]	380	chdev_t * chdev_ptr; // associated chdev type
	381	uint32_t func; // chdev functionnal type
	382	uint32_t channel; // chdev channel index
	383	error_t error;
	384
	385	char k_buf[CONFIG_TXT_KBUF_SIZE]; // local kernel buffer
	386
[438]	387	#if (DEBUG_SYS_READ & 1)
[435]	388	enter_devfs_read = hal_time_stamp();
	389	#endif
	390
[438]	391	#if (DEBUG_SYS_WRITE & 1)
[435]	392	enter_devfs_write = hal_time_stamp();
	393	#endif
	394
[438]	395	#if DEBUG_DEVFS_MOVE
[433]	396	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	397	if( DEBUG_DEVFS_MOVE < cycle )
[433]	398	printk("\n[DBG] %s : thread %x enter / to_mem %d / cycle %d\n",
	399	__FUNCTION__ , CURRENT_THREAD , to_buffer , cycle );
	400	#endif
[407]	401
[430]	402	// get extended pointer on chdev_xp
	403	chdev_xp = chdev_from_file( file_xp );
[407]	404
[430]	405	// get cluster and local pointer on chdev
	406	chdev_cxy = GET_CXY( chdev_xp );
	407	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
[407]	408
	409	// get chdev functionnal type and channel
[430]	410	func = hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->func ) );
	411	channel = hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->channel ) );
[407]	412
	413	// action depends on "func" and "to_buffer"
	414	if( func == DEV_FUNC_TXT )
	415	{
	416	if( to_buffer ) // TXT read
	417	{
	418	uint32_t i;
	419	for( i = 0 ; i < size ; i++ )
	420	{
	421	error = dev_txt_read( channel , &k_buf[i] );
	422
	423	if( error )
	424	{
	425	return -1;
	426	}
	427	else
	428	{
	429	hal_strcpy_to_uspace( u_buf , k_buf , size );
	430	}
	431	}
	432
[438]	433	#if DEBUG_DEVFS_MOVE
[433]	434	cycle = (uint32_t)hal_get_cycles();
[438]	435	if( DEBUG_DEVFS_MOVE < cycle )
[433]	436	printk("\n[DBG] %s : thread %x exit / to_mem %d / cycle %d\n",
	437	__FUNCTION__ , CURRENT_THREAD , to_buffer / cycle );
	438	#endif
	439
[438]	440	#if (DEBUG_SYS_READ & 1)
[435]	441	exit_devfs_read = hal_time_stamp();
[407]	442	#endif
	443	return size;
	444	}
	445	else // TXT write
	446	{
	447	hal_strcpy_from_uspace( k_buf , u_buf , size );
	448
	449	error = dev_txt_write( channel , k_buf , size );
	450	if( error )
	451	{
	452	return -1;
	453	}
	454	else
	455	{
	456
[438]	457	#if DEBUG_DEVFS_MOVE
[433]	458	cycle = (uint32_t)hal_get_cycles();
[438]	459	if( DEBUG_DEVFS_MOVE < cycle )
[433]	460	printk("\n[DBG] %s : thread %x exit / to_mem %d / cycle %d\n",
	461	__FUNCTION__ , CURRENT_THREAD , to_buffer / cycle );
	462	#endif
[407]	463
[438]	464	#if (DEBUG_SYS_WRITE & 1)
[435]	465	exit_devfs_write = hal_time_stamp();
	466	#endif
[407]	467	return size;
	468	}
	469	}
	470	}
	471	else
	472	{
[430]	473	assert( false , __FUNCTION__ ,
	474	"%s does not support direct user access", chdev_func_str(func) );
[407]	475
	476	return -1;
	477	}
[433]	478
[407]	479	} // end devfs_user_move()
	480
	481

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