arcbios_tty.c revision 1.1.2.1
1 /* $NetBSD: arcbios_tty.c,v 1.1.2.1 2001/09/13 01:15:36 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. 5 * All rights reserved. 6 * 7 * Author: Chris G. Demetriou 8 * 9 * Permission to use, copy, modify and distribute this software and 10 * its documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie the 27 * rights to redistribute these changes. 28 */ 29 30 #include <sys/param.h> 31 #include <sys/user.h> 32 #include <sys/uio.h> 33 #include <sys/systm.h> 34 #include <sys/callout.h> 35 #include <sys/kernel.h> 36 #include <sys/conf.h> 37 #include <sys/proc.h> 38 #include <sys/tty.h> 39 #include <sys/termios.h> 40 41 #include <dev/cons.h> 42 43 #include <dev/arcbios/arcbios.h> 44 #include <dev/arcbios/arcbiosvar.h> 45 46 struct callout arcbios_tty_ch = CALLOUT_INITIALIZER; 47 48 static struct tty *arcbios_tty[1]; 49 50 void arcbios_tty_start(struct tty *); 51 void arcbios_tty_poll(void *); 52 int arcbios_tty_param(struct tty *, struct termios *); 53 54 cdev_decl(arcbios_tty); 55 56 int 57 arcbios_ttyopen(dev_t dev, int flag, int mode, struct proc *p) 58 { 59 int unit = minor(dev); 60 struct tty *tp; 61 int s, error = 0, setuptimeout = 0; 62 63 if (unit != 0) 64 return (ENODEV); 65 66 s = spltty(); 67 68 if (arcbios_tty[unit] == NULL) { 69 tp = arcbios_tty[unit] = ttymalloc(); 70 tty_attach(tp); 71 } else 72 tp = arcbios_tty[unit]; 73 74 tp->t_oproc = arcbios_tty_start; 75 tp->t_param = arcbios_tty_param; 76 tp->t_dev = dev; 77 if ((tp->t_state & TS_ISOPEN) == 0) { 78 tp->t_state |= TS_CARR_ON; 79 ttychars(tp); 80 tp->t_iflag = TTYDEF_IFLAG; 81 tp->t_oflag = TTYDEF_OFLAG; 82 tp->t_cflag = TTYDEF_CFLAG | CLOCAL; 83 tp->t_lflag = TTYDEF_LFLAG; 84 tp->t_ispeed = tp->t_ospeed = 9600; 85 ttsetwater(tp); 86 87 setuptimeout = 1; 88 } else if (tp->t_state & TS_XCLUDE && p->p_ucred->cr_uid != 0) { 89 splx(s); 90 return (EBUSY); 91 } 92 93 splx(s); 94 95 error = (*tp->t_linesw->l_open)(dev, tp); 96 if (error == 0 && setuptimeout) 97 callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp); 98 99 return (error); 100 } 101 102 int 103 arcbios_ttyclose(dev_t dev, int flag, int mode, struct proc *p) 104 { 105 int unit = minor(dev); 106 struct tty *tp = arcbios_tty[unit]; 107 108 callout_stop(&arcbios_tty_ch); 109 (*tp->t_linesw->l_close)(tp, flag); 110 ttyclose(tp); 111 return (0); 112 } 113 114 int 115 arcbios_ttyread(dev_t dev, struct uio *uio, int flag) 116 { 117 struct tty *tp = arcbios_tty[minor(dev)]; 118 119 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 120 } 121 122 int 123 arcbios_ttywrite(dev_t dev, struct uio *uio, int flag) 124 { 125 struct tty *tp = arcbios_tty[minor(dev)]; 126 127 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 128 } 129 130 int 131 arcbios_ttypoll(dev_t dev, int events, struct proc *p) 132 { 133 struct tty *tp = arcbios_tty[minor(dev)]; 134 135 return ((*tp->t_linesw->l_poll)(tp, events, p)); 136 } 137 138 int 139 arcbios_ttyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) 140 { 141 int unit = minor(dev); 142 struct tty *tp = arcbios_tty[unit]; 143 int error; 144 145 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 146 if (error >= 0) 147 return (error); 148 error = ttioctl(tp, cmd, data, flag, p); 149 if (error >= 0) 150 return (error); 151 152 return (ENOTTY); 153 } 154 155 int 156 arcbios_tty_param(struct tty *tp, struct termios *t) 157 { 158 159 return (0); 160 } 161 162 void 163 arcbios_tty_start(struct tty *tp) 164 { 165 uint32_t count; 166 int s; 167 168 s = spltty(); 169 if (tp->t_state & (TS_TTSTOP | TS_BUSY)) 170 goto out; 171 if (tp->t_outq.c_cc <= tp->t_lowat) { 172 if (tp->t_state & TS_ASLEEP) { 173 tp->t_state &= ~TS_ASLEEP; 174 wakeup((caddr_t)&tp->t_outq); 175 } 176 selwakeup(&tp->t_wsel); 177 } 178 tp->t_state |= TS_BUSY; 179 while (tp->t_outq.c_cc != 0) { 180 (*ARCBIOS->Write)(ARCBIOS_STDOUT, tp->t_outq.c_cf, 181 ndqb(&tp->t_outq, 0), &count); 182 ndflush(&tp->t_outq, count); 183 } 184 tp->t_state &= ~TS_BUSY; 185 out: 186 splx(s); 187 } 188 189 void 190 arcbios_ttystop(struct tty *tp, int flag) 191 { 192 int s; 193 194 s = spltty(); 195 if (tp->t_state & TS_BUSY) 196 if ((tp->t_state & TS_TTSTOP) == 0) 197 tp->t_state |= TS_FLUSH; 198 splx(s); 199 } 200 201 static int 202 arcbios_tty_getchar(int *cp) 203 { 204 char c; 205 int32_t q; 206 u_int32_t count; 207 208 q = ARCBIOS->GetReadStatus(ARCBIOS_STDIN); 209 210 if (q == 0) { 211 ARCBIOS->Read(ARCBIOS_STDIN, &c, 1, &count); 212 *cp = c; 213 214 return 1; 215 } 216 217 return 0; 218 } 219 220 void 221 arcbios_tty_poll(void *v) 222 { 223 struct tty *tp = v; 224 int c, l_r; 225 226 while (arcbios_tty_getchar(&c)) { 227 if (tp->t_state & TS_ISOPEN) 228 l_r = (*tp->t_linesw->l_rint)(c, tp); 229 } 230 callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp); 231 } 232 233 struct tty * 234 arcbios_ttytty(dev_t dev) 235 { 236 237 if (minor(dev) != 0) 238 panic("arcbios_ttytty: bogus"); 239 240 return (arcbios_tty[0]); 241 } 242
Indexes created Sun Oct 19 02:09:48 GMT 2025