source: trunk/hal/x86_64/drivers/soclib_tty.c @ 238

Last change on this file since 238 was 100, checked in by max@…, 5 years ago

add a part of the tty driver; not tested yet (due to a NULL deref earlier
in the MI code), but mostly fine

File size: 3.1 KB
Line 
1/*
2 * soclib_tty.c - soclib tty driver implementation.
3 *
4 * Author  Alain Greiner (2016)
5 *
6 * Copyright (c)  UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH..
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-MKH.; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <dev_txt.h>
25#include <chdev.h>
26#include <soclib_tty.h>
27#include <remote_spinlock.h>
28#include <thread.h>
29#include <hal_special.h>
30
31#include <hal_internal.h> // XXX
32
33void soclib_tty_init( chdev_t * chdev )
34{
35        // nothing to do
36}
37
38// Pour le write: tout en sync, ça part direct sur le VGA/série
39// Pour le read: là on attend l'ISR
40void __attribute__ ((noinline)) soclib_tty_cmd( xptr_t th_xp )
41{
42        // get client thread cluster and local pointer
43        cxy_t      th_cxy = GET_CXY( th_xp );
44        thread_t * th_ptr = (thread_t *)GET_PTR( th_xp );
45
46        // get command type and extended pointer on TXT device
47        uint32_t type   =         hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.txt.type ) );
48        xptr_t   dev_xp = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->command.txt.dev_xp ) );
49
50        // get TXT device cluster and local pointer
51        cxy_t     dev_cxy = GET_CXY( dev_xp );
52        chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
53
54        // get extended pointer on SOCLIB_TTY base segment
55        xptr_t tty_xp = (xptr_t)hal_remote_lwd( XPTR( dev_cxy , &dev_ptr->base ) );
56
57        // get SOCLIB_TTY base segment cluster and local pointer
58        cxy_t      tty_cxy = GET_CXY( tty_xp );
59        uint32_t * tty_ptr = (uint32_t *)GET_PTR( tty_xp );
60
61        // get TTY channel index
62        uint32_t   channel = hal_remote_lw( XPTR( dev_cxy , &dev_ptr->channel ) );
63
64        // for now, only channel zero
65        if (channel != 0) {
66                x86_panic("should have been channel zero");
67        }
68
69        if (type == TXT_READ)              // descheduling strategy for calling thread
70        {
71                x86_panic("TXT_READ not handled");
72        }
73        else if (type == TXT_WRITE || type == TXT_SYNC_WRITE) // busy waiting strategy for calling thread
74        {
75                uint32_t   i;
76
77                // get source buffer extended pointer & bytes count
78                uint32_t count  = hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.txt.count ) );
79                xptr_t   buf_xp = hal_remote_lwd( XPTR( th_cxy , &th_ptr->command.txt.buf_xp ) );
80
81                // loop on characters
82                for (i = 0; i < count; i++)
83                {
84                        // get one byte from command buffer in client cluster
85                        char byte = (char)hal_remote_lb( buf_xp + i );
86
87                        // VGA output (for now)
88                        x86_putc(byte);
89                }
90        }
91}
92
93void __attribute__ ((noinline)) soclib_tty_isr( chdev_t * chdev )
94{
95        // Cette ISR est juste utile pour le clavier; on arrive ici quand une touche
96        // est pressée
97        x86_panic("soclib_tty_isr not handled");
98}
99
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