source: trunk/kernel/devices/dev_txt.c @ 435

Last change on this file since 435 was 435, checked in by alain, 4 years ago

Fix a bad bug in scheduler...

File size: 7.3 KB
Line 
1/*
2 * dev_txt.c - TXT (Text Terminal) generic device API implementation.
3 *
4 * Author  Alain Greiner    (2016)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MK
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-kernel; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <hal_types.h>
25#include <hal_special.h>
26#include <hal_remote.h>
27#include <hal_drivers.h>
28#include <thread.h>
29#include <chdev.h>
30#include <rpc.h>
31#include <printk.h>
32#include <dev_txt.h>
33
34/////////////////////////////////////////////////////////////////////////////////////////
35// Extern global variables
36/////////////////////////////////////////////////////////////////////////////////////////
37
38extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c
39
40#if (CONFIG_DEBUG_SYS_READ & 1)
41extern uint32_t enter_txt_read;
42extern uint32_t exit_txt_read;
43#endif
44
45#if (CONFIG_DEBUG_SYS_WRITE & 1)
46extern uint32_t enter_txt_write;
47extern uint32_t exit_txt_write;
48#endif
49
50////////////////////////////////////////
51char * dev_txt_type_str( uint32_t type )
52{
53    if     ( type == TXT_SYNC_WRITE ) return "TXT_SYNC_WRITE";
54    else if( type == TXT_READ       ) return "TXT_READ";
55    else if( type == TXT_WRITE      ) return "TXT_WRITE";
56    else                              return "undefined"; 
57}
58
59//////////////////////////////////
60void dev_txt_init( chdev_t * txt )
61{
62    // For all TXT channels other than the TXT0 (kernel terminal),
63    // the PIC chdev must be initialized before the TXT chdev, because
64    // the TXT chdev initialization requires the routing of an external IRQ
65
66    xptr_t    pic_xp  = chdev_dir.pic;
67    uint32_t  channel = txt->channel;
68    uint32_t  impl    = txt->impl;
69    bool_t    is_rx   = txt->is_rx;
70
71    assert( (pic_xp != XPTR_NULL) || (channel == 0) , __FUNCTION__ , 
72            "PIC not initialised before TXT" );
73
74    // set chdev name
75    if( is_rx ) snprintf( txt->name , 16 , "txt%d_rx" , channel );
76    else        snprintf( txt->name , 16 , "txt%d_tx" , channel );
77
78    // set TXT chdev extension
79    txt->ext.txt.owner_xp = XPTR_NULL;
80    xlist_root_init( XPTR( local_cxy, &txt->ext.txt.root ) );
81    remote_spinlock_init( XPTR( local_cxy , &txt->ext.txt.lock ) );
82   
83    // call driver init function
84    hal_drivers_txt_init(txt, impl);
85
86    // no server thread and no IRQ routing for TXT0
87    // no server thread for IMPL_TXT_RS2 (multiplexed in software, not hardware)
88    if( channel != 0 && impl != IMPL_TXT_RS2 )
89    {
90        // select a core to execute the server thread
91        lid_t lid = cluster_select_local_core();
92
93        // bind IRQ to the selected core
94        dev_pic_bind_irq( lid , txt );
95
96        // enable IRQ
97        dev_pic_enable_irq( lid , XPTR( local_cxy , txt ) );
98
99        // create server thread
100        thread_t * new_thread;
101        error_t    error;
102
103        error = thread_kernel_create( &new_thread,
104                                      THREAD_DEV,
105                                      &chdev_sequencial_server,
106                                      txt,
107                                      lid );
108
109        assert( (error == 0) , __FUNCTION__ , "cannot create server thread" );
110
111        // set "server" field in chdev descriptor
112        txt->server = new_thread;
113
114        // set "chdev" field in thread descriptor
115        new_thread->chdev = txt;
116
117        // unblock server thread
118        thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
119    }
120}
121
122//////////////////////////////////////////////////////////////////////////////////
123// This static function is called by dev_txt_read(), dev_txt_write() functions.
124////////////////////////////////////i/////////////////////////////////////////////
125static error_t dev_txt_access( uint32_t   type,
126                               uint32_t   channel,
127                               char     * buffer,
128                               uint32_t   count )
129{
130    xptr_t     dev_xp;
131    thread_t * this = CURRENT_THREAD;
132
133#if (CONFIG_DEBUG_SYS_READ & 1)
134enter_txt_read = hal_time_stamp();
135#endif
136
137#if (CONFIG_DEBUG_SYS_WRITE & 1)
138enter_txt_write = hal_time_stamp();
139#endif
140
141#if CONFIG_DEBUG_DEV_TXT
142uint32_t cycle = (uint32_t)hal_get_cycles();
143if( CONFIG_DEBUG_DEV_TXT < cycle )
144printk("\n[DBG] %s : thread %x enters / cycle %d\n",
145__FUNCTION__, CURRENT_THREAD , cycle );
146#endif
147
148    // check channel argument
149    assert( (channel < CONFIG_MAX_TXT_CHANNELS) , __FUNCTION__ , "illegal channel index" );
150
151    // get extended pointer on remote TXT chdev descriptor
152    if( type == TXT_WRITE )  dev_xp = chdev_dir.txt_tx[channel];
153    else                     dev_xp = chdev_dir.txt_rx[channel];
154
155    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined TXT chdev descriptor" );
156
157    // register command in calling thread descriptor
158    this->txt_cmd.dev_xp  = dev_xp;
159    this->txt_cmd.type    = type;
160    this->txt_cmd.buf_xp  = XPTR( local_cxy , buffer );
161    this->txt_cmd.count   = count;
162
163    // register client thread in waiting queue, activate server thread
164    // block client thread on THREAD_BLOCKED_IO and deschedule.
165    // it is re-activated by the ISR signaling IO operation completion.
166    chdev_register_command( dev_xp );
167
168#if CONFIG_DEBUG_DEV_TXT
169cycle = (uint32_t)hal_get_cycles();
170if( CONFIG_DEBUG_DEV_TXT < cycle )
171printk("\n[DBG] %s : thread %x exit / cycle %d\n",
172__FUNCTION__, CURRENT_THREAD , cycle );
173#endif
174
175#if (CONFIG_DEBUG_SYS_READ & 1)
176exit_txt_read = hal_time_stamp();
177#endif
178
179#if (CONFIG_DEBUG_SYS_WRITE & 1)
180exit_txt_write = hal_time_stamp();
181#endif
182
183    // return I/O operation status from calling thread descriptor
184    return this->txt_cmd.error;
185}
186
187/////////////////////////////////////////
188error_t dev_txt_write( uint32_t   channel,
189                       char     * buffer,
190                       uint32_t   count )
191{
192    return dev_txt_access( TXT_WRITE , channel , buffer , count );
193}
194
195/////////////////////////////////////////
196error_t dev_txt_read( uint32_t   channel,
197                      char     * buffer )
198{
199    return dev_txt_access( TXT_READ , channel , buffer , 1 );
200}
201
202//////////////////////////////////////////////
203error_t dev_txt_sync_write( char     * buffer,
204                            uint32_t   count )
205{
206    // get extended pointer on TXT[0] chdev
207    xptr_t  dev_xp = chdev_dir.txt_tx[0];
208
209    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ ,
210    "undefined TXT0 chdev descriptor" );
211
212    // get TXTO chdev cluster and local pointer
213    cxy_t    dev_cxy  = GET_CXY( dev_xp );
214    chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
215
216    // get driver command function
217    dev_aux_t * aux = (dev_aux_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->aux ) );
218
219    // build arguments structure
220    txt_sync_args_t  args;
221    args.dev_xp = dev_xp;
222    args.buffer = buffer;
223    args.count  = count;
224
225    // call driver function
226    aux( &args );
227
228    return 0;
229}
230
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