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console.c revision 1.4 
      1 /*	$NetBSD: console.c,v 1.4 1998/08/22 10:55:37 scw Exp $	*/
      2 
      3 /*
      4  *
      5  * Copyright (c) 1995 Charles D. Cranor and Seth Widoff
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *      This product includes software developed by Charles D. Cranor
     19  *	and Seth Widoff.
     20  * 4. The name of the author may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 /*
     35  * console i/o
     36  */
     37 
     38 #include "sboot.h"
     39 
     40 /*
     41  * hardware
     42  */
     43 
     44 struct zs_hw {
     45   volatile u_char ctl;
     46   volatile u_char data;
     47 };
     48 
     49 struct zs_hw *zs =  (struct zs_hw *)CONS_ZS_ADDR;
     50 
     51 /*
     52  * consinit: init console
     53  */
     54 
     55 consinit()
     56 
     57 {
     58   int mark = time();
     59   int rr1;
     60   while (1) {
     61     if (time() > mark + 5) break;
     62     zs->ctl = 1; rr1 = zs->ctl;
     63     zs->ctl = 0;
     64     if ((rr1 & 0x1) == 1 && (zs->ctl & 0x4) == 4) break; /* zs_drain! */
     65   }
     66   zs->ctl =  9; zs->ctl = 0x00; /* clear interrupt */
     67   zs->ctl =  4; zs->ctl = 0x44; /* 16x clk, 1 stop bit */
     68   zs->ctl =  5; zs->ctl = 0xea; /* DTR on, 8 bit xmit, xmit on, RTS on */
     69   zs->ctl =  3; zs->ctl = 0xc1; /* 8 bit recv, auto cd_cts, recv on */
     70   zs->ctl =  1; zs->ctl = 0x00; /* no intrs */
     71   zs->ctl =  2; zs->ctl = 0x00; /* no vector */
     72   zs->ctl = 10; zs->ctl = 0x00; /* */
     73   zs->ctl = 11; zs->ctl = 0x50; /* clocking options */
     74   zs->ctl = 12; zs->ctl = 0x0e; /* 9600 baud, part 1 */
     75   zs->ctl = 13; zs->ctl = 0x00; /* 9600 baud, part 2 */
     76   zs->ctl = 14; zs->ctl = 0x03; /* more clocking options */
     77   zs->ctl = 15; zs->ctl = 0x00; /* clear intrs */
     78 }
     79 
     80 /*
     81  * putchar: put char to console
     82  */
     83 
     84 void putchar(char c)
     85 {
     86   if (c == '\n') putchar('\r');  /* avoid the need for \r\n in printf */
     87   zs->ctl = 0;
     88   while ((zs->ctl & 0x04) == 0) {
     89     zs->ctl = 0;
     90   }
     91   zs->ctl = 8;
     92   zs->ctl = c;
     93 }
     94 
     95 /*
     96  * cngetc: get 1 char from console
     97  */
     98 
     99 char cngetc ()
    100 {
    101   zs->ctl = 0;
    102   while ((zs->ctl & 0x1) == 0) {
    103     zs->ctl = 0;
    104   }
    105   zs->ctl = 8;
    106   return zs->ctl;
    107 }
    108 
    109 /*
    110  * puts: put string to console
    111  */
    112 
    113 void puts ( char * str )
    114 {
    115   while ( *str != '\0' ) {
    116     putchar(*str);
    117     str++;
    118   }
    119 }
    120 
    121 /*
    122  * ngets: get string from console
    123  */
    124 
    125 char *ngets ( char * str, int size )
    126 {
    127   int i = 0;
    128   while ( (i < size - 1) && (str[i] = cngetc()) != '\r') {
    129     if ( str[i] == '\b' || str[i] == 0x7F ) {
    130       if ( i == 0) continue;
    131       i--;
    132       puts("\b \b");
    133       continue;
    134     }
    135     putchar(str[i]);
    136     i++;
    137   }
    138   puts("\n");
    139   str[i] = '\0';
    140   return(&str[i]);
    141 }
    142 
    143