console.c

   1 /* The SRM console prompt.
   2
   3    Copyright (C) 2011 Richard Henderson
   4
   5    This file is part of QEMU PALcode.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the text
  15    of the GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; see the file COPYING.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include "protos.h"
  22 #include "console.h"
  23
  24
  25 static void
  26 output_crnl(void)
  27 {
  28   crb_puts(0, "\r\n", 2);
  29 }
  30
  31 static void
  32 output_bell(void)
  33 {
  34   crb_puts(0, "\a", 1);
  35 }
  36
  37 static void
  38 backspace_and_erase(void)
  39 {
  40   crb_puts(0, "\b \b", 3);
  41 }
  42
  43 static unsigned long
  44 getline(char *buf, unsigned long bufsize)
  45 {
  46   unsigned long len = 0;
  47   long c;
  48
  49   while (1)
  50     {
  51       c = crb_getc(0);
  52       if (c < 0)
  53         continue;
  54       switch ((int)c)
  55         {
  56         case '\r':
  57         case '\n':
  58           output_crnl();
  59           buf[len] = 0;
  60           return len;
  61
  62         case '\b':
  63         case 0x7f: /* Delete */
  64           if (len > 0)
  65             {
  66               backspace_and_erase();
  67               len--;
  68             }
  69           else
  70             output_bell();
  71           break;
  72
  73         default:
  74           if (len + 1 < bufsize)
  75             {
  76               buf[len] = c;
  77               crb_puts(0, buf+len, 1);
  78               len++;
  79             }
  80           else
  81             output_bell();
  82           break;
  83         }
  84     }
  85 }
  86
  87 static inline void set_console_alarm(void)
  88 {
  89   /* Just set a new timeout for 10ms = 10M ns.  */
  90   set_alarm_rel(10 * 1000 * 1000);
  91 }
  92
  93 void
  94 do_entInt(unsigned long type, unsigned long vector)
  95 {
  96   switch (type)
  97     {
  98     case 0:
  99       /* ??? SMP interrupt.  We're going to need this for starting up
 100          secondary cpus.  */
 101       break;
 102     case 1:
 103       /* Timer interrupt.  */
 104       set_console_alarm();
 105       break;
 106     case 2:
 107       /* ??? Device interrupt.  We're going to need this for virtio disk
 108          operations at minimum.  */
 109       break;
 110     }
 111 }
 112
 113 void
 114 do_console(void)
 115 {
 116   char line[256];
 117   unsigned long len;
 118
 119   wrkgp();
 120   wrent(entInt, 0);
 121   set_console_alarm();
 122   swpipl(0);
 123
 124   pci_setup();
 125
 126   while (1)
 127     {
 128       crb_puts(0, ">>> ", 4);
 129       len = getline(line, sizeof(line));
 130       crb_puts(0, "got: ", 5);
 131       crb_puts(0, line, len);
 132       output_crnl();
 133     }
 134 }