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console.c revision 1.5 
      1 /*	$NetBSD: console.c,v 1.5 2000/07/24 18:40:01 jdolecek 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 void
     56 consinit()
     57 
     58 {
     59   int mark = time();
     60   int rr1;
     61   while (1) {
     62     if (time() > mark + 5) break;
     63     zs->ctl = 1; rr1 = zs->ctl;
     64     zs->ctl = 0;
     65     if ((rr1 & 0x1) == 1 && (zs->ctl & 0x4) == 4) break; /* zs_drain! */
     66   }
     67   zs->ctl =  9; zs->ctl = 0x00; /* clear interrupt */
     68   zs->ctl =  4; zs->ctl = 0x44; /* 16x clk, 1 stop bit */
     69   zs->ctl =  5; zs->ctl = 0xea; /* DTR on, 8 bit xmit, xmit on, RTS on */
     70   zs->ctl =  3; zs->ctl = 0xc1; /* 8 bit recv, auto cd_cts, recv on */
     71   zs->ctl =  1; zs->ctl = 0x00; /* no intrs */
     72   zs->ctl =  2; zs->ctl = 0x00; /* no vector */
     73   zs->ctl = 10; zs->ctl = 0x00; /* */
     74   zs->ctl = 11; zs->ctl = 0x50; /* clocking options */
     75   zs->ctl = 12; zs->ctl = 0x0e; /* 9600 baud, part 1 */
     76   zs->ctl = 13; zs->ctl = 0x00; /* 9600 baud, part 2 */
     77   zs->ctl = 14; zs->ctl = 0x03; /* more clocking options */
     78   zs->ctl = 15; zs->ctl = 0x00; /* clear intrs */
     79 }
     80 
     81 /*
     82  * putchar: put char to console
     83  */
     84 
     85 void putchar(int c)
     86 {
     87   if (c == '\n') putchar('\r');  /* avoid the need for \r\n in printf */
     88   zs->ctl = 0;
     89   while ((zs->ctl & 0x04) == 0) {
     90     zs->ctl = 0;
     91   }
     92   zs->ctl = 8;
     93   zs->ctl = (char) c;
     94 }
     95 
     96 /*
     97  * cngetc: get 1 char from console
     98  */
     99 
    100 char cngetc ()
    101 {
    102   zs->ctl = 0;
    103   while ((zs->ctl & 0x1) == 0) {
    104     zs->ctl = 0;
    105   }
    106   zs->ctl = 8;
    107   return zs->ctl;
    108 }
    109 
    110 /*
    111  * puts: put string to console
    112  */
    113 
    114 void puts ( char * str )
    115 {
    116   while ( *str != '\0' ) {
    117     putchar(*str);
    118     str++;
    119   }
    120 }
    121 
    122 /*
    123  * ngets: get string from console
    124  */
    125 
    126 char *ngets ( char * str, int size )
    127 {
    128   int i = 0;
    129   while ( (i < size - 1) && (str[i] = cngetc()) != '\r') {
    130     if ( str[i] == '\b' || str[i] == 0x7F ) {
    131       if ( i == 0) continue;
    132       i--;
    133       puts("\b \b");
    134       continue;
    135     }
    136     putchar(str[i]);
    137     i++;
    138   }
    139   puts("\n");
    140   str[i] = '\0';
    141   return(&str[i]);
    142 }
    143 
    144