| 1 | /* |
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| 2 | * txt_rs232.c - RS232 driver implementation |
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| 3 | * |
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| 4 | * Copyright (c) 2017 Maxime Villard |
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| 5 | * |
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| 6 | * This file is part of ALMOS-MKH. |
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| 7 | * |
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| 8 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 9 | * under the terms of the GNU General Public License as published by |
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| 10 | * the Free Software Foundation; version 2.0 of the License. |
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| 11 | * |
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| 12 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU General Public License |
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| 18 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |
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| 22 | #include <dev_txt.h> |
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| 23 | #include <chdev.h> |
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| 24 | #include <txt_rs232.h> |
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| 25 | #include <remote_spinlock.h> |
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| 26 | #include <thread.h> |
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| 27 | #include <hal_special.h> |
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| 28 | |
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| 29 | #include <hal_internal.h> // XXX |
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| 30 | |
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| 31 | void txt_rs232_init(chdev_t *chdev) |
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| 32 | { |
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| 33 | chdev->cmd = &txt_rs232_cmd; |
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| 34 | chdev->isr = &txt_rs232_isr; |
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| 35 | |
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| 36 | // nothing to do |
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| 37 | } |
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| 38 | |
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| 39 | // Pour le write: tout en sync, ça part direct sur le VGA/série |
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| 40 | // Pour le read: là on attend l'ISR |
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| 41 | void txt_rs232_cmd(xptr_t th_xp) |
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| 42 | { |
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| 43 | // get client thread cluster and local pointer |
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| 44 | cxy_t th_cxy = GET_CXY( th_xp ); |
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| 45 | thread_t * th_ptr = (thread_t *)GET_PTR( th_xp ); |
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| 46 | |
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| 47 | // get command type and extended pointer on TXT device |
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| 48 | uint32_t type = hal_remote_l32 ( XPTR( th_cxy , &th_ptr->txt_cmd.type ) ); |
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| 49 | xptr_t dev_xp = (xptr_t)hal_remote_l64( XPTR( th_cxy , &th_ptr->txt_cmd.dev_xp ) ); |
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| 50 | |
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| 51 | // get TXT device cluster and local pointer |
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| 52 | cxy_t dev_cxy = GET_CXY( dev_xp ); |
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| 53 | chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp ); |
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| 54 | |
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| 55 | // get TTY channel index |
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| 56 | uint32_t channel = hal_remote_l32( XPTR( dev_cxy , &dev_ptr->channel ) ); |
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| 57 | |
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| 58 | // for now, only channel zero |
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| 59 | if (channel != 0) { |
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| 60 | x86_panic("should have been channel zero"); |
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| 61 | } |
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| 62 | |
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| 63 | if (type == TXT_READ) // descheduling strategy for calling thread |
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| 64 | { |
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| 65 | x86_panic("TXT_READ not handled"); |
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| 66 | } |
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| 67 | else if (type == TXT_WRITE || type == TXT_SYNC_WRITE) // busy waiting strategy for calling thread |
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| 68 | { |
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| 69 | uint32_t i; |
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| 70 | |
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| 71 | // get source buffer extended pointer & bytes count |
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| 72 | uint32_t count = hal_remote_l32 ( XPTR( th_cxy , &th_ptr->txt_cmd.count ) ); |
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| 73 | xptr_t buf_xp = hal_remote_l64( XPTR( th_cxy , &th_ptr->txt_cmd.buf_xp ) ); |
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| 74 | |
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| 75 | // loop on characters |
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| 76 | for (i = 0; i < count; i++) |
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| 77 | { |
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| 78 | // get one byte from command buffer in client cluster |
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| 79 | char byte = (char)hal_remote_lb( buf_xp + i ); |
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| 80 | |
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| 81 | // VGA output (for now) |
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| 82 | x86_putc(byte); |
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| 83 | } |
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| 84 | } |
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| 85 | } |
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| 86 | |
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| 87 | void txt_rs232_isr(chdev_t *chdev) |
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| 88 | { |
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| 89 | // Cette ISR est juste utile pour le clavier; on arrive ici quand une touche |
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| 90 | // est pressée |
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| 91 | x86_panic("txt_rs232_isr not handled"); |
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| 92 | } |
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| 93 | |
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