Home | History | Annotate | Line # | Download | only in sboot
console.c revision 1.2 
      1 /*
      2  *
      3  * Copyright (c) 1995 Charles D. Cranor and Seth Widoff
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *      This product includes software developed by Charles D. Cranor
     17  *	and Seth Widoff.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 /*
     33  * console i/o
     34  */
     35 
     36 #include "sboot.h"
     37 
     38 /*
     39  * hardware
     40  */
     41 
     42 struct zs_hw {
     43   volatile u_char ctl;
     44   volatile u_char data;
     45 };
     46 
     47 struct zs_hw *zs =  (struct zs_hw *)CONS_ZS_ADDR;
     48 
     49 /*
     50  * consinit: init console
     51  */
     52 
     53 consinit()
     54 
     55 {
     56   register int mark = time();
     57   register int rr1;
     58   while (1) {
     59     if (time() > mark + 5) break;
     60     zs->ctl = 1; rr1 = zs->ctl;
     61     zs->ctl = 0;
     62     if ((rr1 & 0x1) == 1 && (zs->ctl & 0x4) == 4) break; /* zs_drain! */
     63   }
     64   zs->ctl =  9; zs->ctl = 0x00; /* clear interrupt */
     65   zs->ctl =  4; zs->ctl = 0x44; /* 16x clk, 1 stop bit */
     66   zs->ctl =  5; zs->ctl = 0xea; /* DTR on, 8 bit xmit, xmit on, RTS on */
     67   zs->ctl =  3; zs->ctl = 0xc1; /* 8 bit recv, auto cd_cts, recv on */
     68   zs->ctl =  1; zs->ctl = 0x00; /* no intrs */
     69   zs->ctl =  2; zs->ctl = 0x00; /* no vector */
     70   zs->ctl = 10; zs->ctl = 0x00; /* */
     71   zs->ctl = 11; zs->ctl = 0x50; /* clocking options */
     72   zs->ctl = 12; zs->ctl = 0x0e; /* 9600 baud, part 1 */
     73   zs->ctl = 13; zs->ctl = 0x00; /* 9600 baud, part 2 */
     74   zs->ctl = 14; zs->ctl = 0x03; /* more clocking options */
     75   zs->ctl = 15; zs->ctl = 0x00; /* clear intrs */
     76 }
     77 
     78 /*
     79  * putchar: put char to console
     80  */
     81 
     82 void putchar(char c)
     83 {
     84   if (c == '\n') putchar('\r');  /* avoid the need for \r\n in printf */
     85   zs->ctl = 0;
     86   while ((zs->ctl & 0x04) == 0) {
     87     zs->ctl = 0;
     88   }
     89   zs->ctl = 8;
     90   zs->ctl = c;
     91 }
     92 
     93 /*
     94  * cngetc: get 1 char from console
     95  */
     96 
     97 char cngetc ()
     98 {
     99   zs->ctl = 0;
    100   while ((zs->ctl & 0x1) == 0) {
    101     zs->ctl = 0;
    102   }
    103   zs->ctl = 8;
    104   return zs->ctl;
    105 }
    106 
    107 /*
    108  * puts: put string to console
    109  */
    110 
    111 void puts ( char * str )
    112 {
    113   while ( *str != '\0' ) {
    114     putchar(*str);
    115     str++;
    116   }
    117 }
    118 
    119 /*
    120  * ngets: get string from console
    121  */
    122 
    123 char *ngets ( char * str, int size )
    124 {
    125   int i = 0;
    126   while ( (i < size - 1) && (str[i] = cngetc()) != '\r') {
    127     if ( str[i] == '\b' || str[i] == 0x7F ) {
    128       if ( i == 0) continue;
    129       i--;
    130       puts("\b \b");
    131       continue;
    132     }
    133     putchar(str[i]);
    134     i++;
    135   }
    136   puts("\n");
    137   str[i] = '\0';
    138   return(&str[i]);
    139 }
    140 
    141