source: trunk/kernel/devices/dev_txt.c @ 23

Last change on this file since 23 was 23, checked in by alain, 5 years ago

Introduce syscalls.

File size: 6.5 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 <soclib_tty.h>
28#include <thread.h>
29#include <rpc.h>
30#include <printk.h>
31#include <dev_txt.h>
32
33/////////////////////////////////////////////////////////////////////////////////////////
34// Extern global variables
35/////////////////////////////////////////////////////////////////////////////////////////
36
37extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c
38
39extern chdev_pic_input_t  chdev_pic_input;   // allocated in kernel_init.c
40
41////////////////////////////////////
42void dev_txt_init( chdev_t * chdev )
43{
44    // the local ICU chdev must be initialized before the TXT chdev, because
45    // the TXT chdev initialisation requires allocation of a WTI from local ICU
46    xptr_t  icu_xp  = chdev_dir.icu[local_cxy];
47    assert( (icu_xp != XPTR_NULL) , __FUNCTION__ , "ICU not initialised before TXT" );
48
49    // get implementation and channel index
50    uint32_t  impl    = chdev->impl;
51    uint32_t  channel = chdev->channel;
52
53    // set chdev name
54    snprintf( chdev->name , 16 , "txt_%d" , chdev->channel );
55
56    // set fields "cmd", "isr", and call driver init function
57    if( impl == IMPL_TXT_TTY )
58    {
59        chdev->cmd = &soclib_tty_cmd;
60        chdev->isr = &soclib_tty_isr;
61        soclib_tty_init( chdev );
62    }
63    else
64    {
65        assert( false , __FUNCTION__ , "undefined TXT device implementation" );
66    }
67
68    // get a WTI mailbox from local ICU
69    uint32_t wti_id = dev_icu_wti_alloc();
70
71    assert( (wti_id != -1) , __FUNCTION__ , "cannot allocate WTI mailbox" );
72
73    // select a core
74    lid_t lid = cluster_select_local_core();
75
76    // enable WTI IRQ and update WTI interrupt vector
77    dev_icu_enable_irq( lid , WTI_TYPE , wti_id , chdev );
78
79    // link IOC IRQ to WTI mailbox in PIC component
80    uint32_t irq_id = chdev_pic_input.txt[channel];
81    dev_pic_bind_irq( irq_id , local_cxy , wti_id );
82
83    // create server thread
84    thread_t * new_thread;
85    error_t    error;
86
87    error = thread_kernel_create( &new_thread,
88                                  THREAD_DEV,
89                                  &chdev_sequencial_server,
90                                  chdev,
91                                  lid ); 
92    assert( (error == 0) , __FUNCTION__ , "cannot create server thread" );
93
94    // set "server" field in chdev descriptor
95    chdev->server = new_thread;
96   
97    // start server thread
98    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
99
100} // end dev_txt_init()
101
102
103//////////////////////////////////////////////////////////////////////////////////
104// This static function is called by dev_txt_read(), dev_txt_write() functions.
105////////////////////////////////////i/////////////////////////////////////////////
106static error_t dev_txt_access( uint32_t   type,
107                               uint32_t   channel,
108                               char     * buffer,
109                               uint32_t   count )
110{
111    thread_t * this = CURRENT_THREAD;
112
113    txt_dmsg("\n[INFO] in %s : thread %x in process %x enters\n", 
114                 __FUNCTION__ , this->trdid , this->process->pid );
115
116    // check channel argument
117    assert( (channel < CONFIG_MAX_TXT_CHANNELS) , __FUNCTION__ , "illegal channel index" );
118
119    // get extended pointer on remote TXT chdev descriptor
120    xptr_t  dev_xp = chdev_dir.txt[channel];
121
122    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined TXT chdev descriptor" );
123
124    // register command in calling thread descriptor
125    this->command.txt.dev_xp  = dev_xp;
126    this->command.txt.type    = type;
127    this->command.txt.buf_xp  = XPTR( local_cxy , buffer );
128    this->command.txt.count   = count;
129
130    // register client thread in waiting queue, activate server thread
131    // block client thread on THREAD_BLOCKED_IO and deschedule.
132    // it is re-activated by the ISR signaling IO operation completion.
133    chdev_register_command( dev_xp , this );
134
135    txt_dmsg("\n[INFO] in %s : thread %x in process %x completes / error = %d\n", 
136             __FUNCTION__ , this->trdid , this->process->pid , this->command.txt.error );
137
138    // return I/O operation status from calling thread descriptor
139    return this->command.txt.error; 
140
141}  // end dev_txt_access()
142
143/////////////////////////////////////////
144error_t dev_txt_write( uint32_t   channel,
145                       char     * buffer,
146                       uint32_t   count )
147{
148    return dev_txt_access( TXT_WRITE , channel , buffer , count );
149}
150 
151/////////////////////////////////////////
152error_t dev_txt_read( uint32_t   channel,
153                      char     * buffer )
154{
155    return dev_txt_access( TXT_READ , channel , buffer , 1 );
156}
157
158///////////////////////////////////////////////
159error_t dev_txt_sync_write( uint32_t   channel,
160                            char     * buffer,
161                            uint32_t   count )
162{
163    // get pointer on calling thread
164    thread_t * this = CURRENT_THREAD;
165
166    // get extended pointer on TXT[0] chdev
167    xptr_t  dev_xp = chdev_dir.txt[channel];
168
169    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined TXT0 chdev descriptor" );
170
171    // register command in calling thread
172    this->command.txt.dev_xp  = dev_xp;
173    this->command.txt.type    = TXT_SYNC_WRITE;
174    this->command.txt.buf_xp  = XPTR( local_cxy , buffer );
175    this->command.txt.count   = count;
176
177    // get driver command function
178    cxy_t       dev_cxy = GET_CXY( dev_xp );
179    chdev_t   * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
180    dev_cmd_t * cmd = (dev_cmd_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->cmd ) );
181
182    // call directly driver command
183    cmd( XPTR( local_cxy , this ) );
184
185    // return I/O operation status from calling thread descriptor
186    return this->command.txt.error;
187 
188}  // end dev_txt_sync_write()
189
Note: See TracBrowser for help on using the repository browser.