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 #include "vgatables.h"
  24
  25
  26 static void
  27 output_crnl(void)
  28 {
  29   crb_puts(0, "\r\n", 2);
  30 }
  31
  32 static void
  33 output_bell(void)
  34 {
  35   crb_puts(0, "\a", 1);
  36 }
  37
  38 static void
  39 backspace_and_erase(void)
  40 {
  41   crb_puts(0, "\b \b", 3);
  42 }
  43
  44 static unsigned long
  45 getline(char *buf, unsigned long bufsize)
  46 {
  47   unsigned long len = 0;
  48   long c;
  49
  50   while (1)
  51     {
  52       c = crb_getc(0);
  53       if (c < 0)
  54         continue;
  55       switch ((int)c)
  56         {
  57         case '\r':
  58         case '\n':
  59           output_crnl();
  60           buf[len] = 0;
  61           return len;
  62
  63         case '\b':
  64         case 0x7f: /* Delete */
  65           if (len > 0)
  66             {
  67               backspace_and_erase();
  68               len--;
  69             }
  70           else
  71             output_bell();
  72           break;
  73
  74         default:
  75           if (len + 1 < bufsize)
  76             {
  77               buf[len] = c;
  78               crb_puts(0, buf+len, 1);
  79               len++;
  80             }
  81           else
  82             output_bell();
  83           break;
  84         }
  85     }
  86 }
  87
  88 static inline void set_console_alarm(void)
  89 {
  90   /* Just set a new timeout for 10ms = 10M ns.  */
  91   set_alarm_rel(10 * 1000 * 1000);
  92 }
  93
  94 void
  95 do_entInt(unsigned long type, unsigned long vector)
  96 {
  97   switch (type)
  98     {
  99     case 0:
 100       /* ??? SMP interrupt.  We're going to need this for starting up
 101          secondary cpus.  */
 102       break;
 103     case 1:
 104       /* Timer interrupt.  */
 105       set_console_alarm();
 106       break;
 107     case 2:
 108       /* ??? Device interrupt.  We're going to need this for virtio disk
 109          operations at minimum.  */
 110       break;
 111     }
 112 }
 113
 114 void
 115 do_console(void)
 116 {
 117   char line[256];
 118   unsigned long len;
 119
 120   wrkgp();
 121   wrent(entInt, 0);
 122   set_console_alarm();
 123   swpipl(0);
 124
 125   if (have_vga)
 126   {
 127     unsigned short *vga, attr;
 128     vga = pci_mem_base + SEG_CTEXT *16;
 129     attr = 0x2000;
 130     vga[0] = 'H' + attr;
 131     vga[1] = 'e' + attr;
 132     vga[2] = 'l' + attr;
 133     vga[3] = 'l' + attr;
 134     vga[4] = 'o' + attr;
 135   }
 136
 137   while (1)
 138     {
 139       crb_puts(0, ">>> ", 4);
 140       len = getline(line, sizeof(line));
 141       crb_puts(0, "got: ", 5);
 142       crb_puts(0, line, len);
 143       output_crnl();
 144     }
 145 }