1 /* 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department. 9 * 10 * %sccs.include.redist.c% 11 * 12 * from: Utah $Hdr: cons.c 1.5 89/08/22$ 13 * 14 * @(#)cons.c 7.2 (Berkeley) 05/25/90 15 */ 16 17 #include "param.h" 18 #include "samachdep.h" 19 #include "machine/cons.h" 20 21 int nodev(); 22 #ifdef ITECONSOLE 23 int iteprobe(), iteinit(), itegetchar(), iteputchar(); 24 #endif 25 #ifdef DCACONSOLE 26 int dcaprobe(), dcainit(), dcagetchar(), dcaputchar(); 27 #endif 28 #ifdef DCMCONSOLE 29 int dcmprobe(), dcminit(), dcmgetchar(), dcmputchar(); 30 #endif 31 32 struct consdev constab[] = { 33 #ifdef ITECONSOLE 34 { iteprobe, iteinit, itegetchar, iteputchar }, 35 #endif 36 #ifdef DCACONSOLE 37 { dcaprobe, dcainit, dcagetchar, dcaputchar }, 38 #endif 39 #ifdef DCMCONSOLE 40 { dcmprobe, dcminit, dcmgetchar, dcmputchar }, 41 #endif 42 { 0 }, 43 }; 44 45 struct consdev *cn_tab; 46 int noconsole; 47 48 cninit() 49 { 50 register struct consdev *cp; 51 52 cn_tab = NULL; 53 noconsole = 1; 54 for (cp = constab; cp->cn_probe; cp++) { 55 (*cp->cn_probe)(cp); 56 if (cp->cn_pri > CN_DEAD && 57 (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) 58 cn_tab = cp; 59 } 60 if (cn_tab) { 61 (*cn_tab->cn_init)(cn_tab); 62 noconsole = 0; 63 } 64 } 65 66 cngetc() 67 { 68 if (cn_tab) 69 return((*cn_tab->cn_getc)()); 70 return(0); 71 } 72 73 cnputc(c) 74 int c; 75 { 76 if (cn_tab) 77 (*cn_tab->cn_putc)(c); 78 } 79