source: trunk/kernel/devices/dev_txt.c @ 190

Last change on this file since 190 was 188, checked in by alain, 5 years ago

Redefine the PIC device API.

File size: 6.3 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 <rpc.h>
30#include <printk.h>
31#include <dev_txt.h>
32#include <soclib_tty.h>
33
34/////////////////////////////////////////////////////////////////////////////////////////
35// Extern global variables
36/////////////////////////////////////////////////////////////////////////////////////////
37
38extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c
39
40//////////////////////////////////
41void dev_txt_init( chdev_t * txt )
42{
43    // For all TXT channels other than the TXT0 (kernel terminal),
44    // the PIC chdev must be initialized before the TXT chdev, because
45    // the TXT chdev initialization requires the routing of an external IRQ
46
47    xptr_t    pic_xp  = chdev_dir.pic;
48    uint32_t  channel = txt->channel;
49    uint32_t  impl    = txt->impl;
50
51    assert( (pic_xp != XPTR_NULL) || (channel == 0) , __FUNCTION__ , 
52            "PIC not initialised before TXT" );
53
54    // set chdev name
55    snprintf( txt->name , 16 , "txt_%d" , channel );
56
57    // set fields "cmd", "isr", and call driver init function
58    if( impl == IMPL_TXT_TTY )
59    {
60        txt->cmd = &soclib_tty_cmd;
61        txt->isr = &soclib_tty_isr;
62        soclib_tty_init( txt );
63    }
64    else
65    {
66        assert( false , __FUNCTION__ , "undefined TXT device implementation" );
67    }
68
69    // no server thread and no IRQ routing for TXT0
70    if( channel != 0 )
71    {
72        // select a core to execute the TXT server thread
73        lid_t lid = cluster_select_local_core();
74
75        // bind TXT IRQ to the selected core
76        dev_pic_bind_irq( lid , txt );
77
78        // enable TXT IRQ
79        dev_pic_enable_irq( lid , txt );
80
81        // create server thread
82        thread_t * new_thread;
83        error_t    error;
84
85        error = thread_kernel_create( &new_thread,
86                                      THREAD_DEV,
87                                      &chdev_sequencial_server,
88                                      txt,
89                                      lid );
90
91        assert( (error == 0) , __FUNCTION__ , "cannot create server thread" );
92
93        // set "server" field in chdev descriptor
94        txt->server = new_thread;
95
96        // start server thread
97        thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
98    }
99}
100
101//////////////////////////////////////////////////////////////////////////////////
102// This static function is called by dev_txt_read(), dev_txt_write() functions.
103////////////////////////////////////i/////////////////////////////////////////////
104static error_t dev_txt_access( uint32_t   type,
105                               uint32_t   channel,
106                               char     * buffer,
107                               uint32_t   count )
108{
109    thread_t * this = CURRENT_THREAD;
110
111    txt_dmsg("\n[INFO] in %s : thread %x in process %x enters\n",
112                 __FUNCTION__ , this->trdid , this->process->pid );
113
114    // check channel argument
115    assert( (channel < CONFIG_MAX_TXT_CHANNELS) , __FUNCTION__ , "illegal channel index" );
116
117    // get extended pointer on remote TXT chdev descriptor
118    xptr_t  dev_xp = chdev_dir.txt[channel];
119
120    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined TXT chdev descriptor" );
121
122    // register command in calling thread descriptor
123    this->command.txt.dev_xp  = dev_xp;
124    this->command.txt.type    = type;
125    this->command.txt.buf_xp  = XPTR( local_cxy , buffer );
126    this->command.txt.count   = count;
127
128    // register client thread in waiting queue, activate server thread
129    // block client thread on THREAD_BLOCKED_IO and deschedule.
130    // it is re-activated by the ISR signaling IO operation completion.
131    chdev_register_command( dev_xp , this );
132
133    txt_dmsg("\n[INFO] in %s : thread %x in process %x completes / error = %d\n",
134             __FUNCTION__ , this->trdid , this->process->pid , this->command.txt.error );
135
136    // return I/O operation status from calling thread descriptor
137    return this->command.txt.error;
138}
139
140/////////////////////////////////////////
141error_t dev_txt_write( uint32_t   channel,
142                       char     * buffer,
143                       uint32_t   count )
144{
145    return dev_txt_access( TXT_WRITE , channel , buffer , count );
146}
147
148/////////////////////////////////////////
149error_t dev_txt_read( uint32_t   channel,
150                      char     * buffer )
151{
152    return dev_txt_access( TXT_READ , channel , buffer , 1 );
153}
154
155///////////////////////////////////////////////
156error_t dev_txt_sync_write( uint32_t   channel,
157                            char     * buffer,
158                            uint32_t   count )
159{
160    // get pointer on calling thread
161    thread_t * this = CURRENT_THREAD;
162
163    // get extended pointer on TXT[0] chdev
164    xptr_t  dev_xp = chdev_dir.txt[channel];
165
166    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined TXT0 chdev descriptor" );
167
168    // register command in calling thread
169    this->command.txt.dev_xp  = dev_xp;
170    this->command.txt.type    = TXT_SYNC_WRITE;
171    this->command.txt.buf_xp  = XPTR( local_cxy , buffer );
172    this->command.txt.count   = count;
173
174    // get driver command function
175    cxy_t       dev_cxy = GET_CXY( dev_xp );
176    chdev_t   * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
177    dev_cmd_t * cmd = (dev_cmd_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->cmd ) );
178
179    // call directly driver command
180    cmd( XPTR( local_cxy , this ) );
181
182    // return I/O operation status from calling thread descriptor
183    return this->command.txt.error;
184}
185
Note: See TracBrowser for help on using the repository browser.