1 | /*
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2 | * Copyright (C) 2006-2016 Oracle Corporation
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3 | *
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4 | * This file is part of VirtualBox Open Source Edition (OSE), as
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5 | * available from http://www.virtualbox.org. This file is free software;
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6 | * you can redistribute it and/or modify it under the terms of the GNU
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7 | * General Public License (GPL) as published by the Free Software
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8 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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9 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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10 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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11 | * --------------------------------------------------------------------
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12 | *
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13 | * This code is based on:
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14 | *
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15 | * ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
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16 | *
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17 | * Copyright (C) 2002 MandrakeSoft S.A.
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18 | *
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19 | * MandrakeSoft S.A.
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20 | * 43, rue d'Aboukir
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21 | * 75002 Paris - France
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22 | * http://www.linux-mandrake.com/
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23 | * http://www.mandrakesoft.com/
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24 | *
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25 | * This library is free software; you can redistribute it and/or
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26 | * modify it under the terms of the GNU Lesser General Public
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27 | * License as published by the Free Software Foundation; either
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28 | * version 2 of the License, or (at your option) any later version.
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29 | *
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30 | * This library is distributed in the hope that it will be useful,
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31 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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32 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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33 | * Lesser General Public License for more details.
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34 | *
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35 | * You should have received a copy of the GNU Lesser General Public
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36 | * License along with this library; if not, write to the Free Software
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37 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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38 | *
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39 | */
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40 |
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41 |
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42 | #include <stdint.h>
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43 | #include <stdarg.h>
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44 | #include "inlines.h"
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45 | #include "biosint.h"
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46 |
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47 | // Debug printf support
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48 |
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49 | /* Redirect INFO output to backdoor logging port. */
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50 | #define INFO_PORT 0x504
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51 | #define DEBUG_PORT 0x403
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52 |
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53 | const char bios_prefix_string[] = "BIOS: ";
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54 |
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55 | void wrch(uint8_t c);
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56 | #pragma aux wrch = "mov ah, 0eh" "int 10h" parm [al] modify exact [ax bx];
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57 |
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58 | void send(uint16_t action, uint8_t c)
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59 | {
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60 | #if BX_DEBUG_SERIAL
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61 | if (c == '\n')
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62 | uart_tx_byte(BX_DEBUG_PORT, '\r');
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63 | uart_tx_byte(BX_DEBUG_PORT, c);
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64 | #endif
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65 | #if BX_VIRTUAL_PORTS
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66 | if (action & BIOS_PRINTF_DEBUG)
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67 | outb(DEBUG_PORT, c);
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68 | if (action & BIOS_PRINTF_INFO)
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69 | outb(INFO_PORT, c);
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70 | #endif
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71 | if (action & BIOS_PRINTF_SCREEN) {
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72 | if (c == '\n')
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73 | wrch('\r');
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74 | wrch(c);
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75 | }
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76 | }
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77 |
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78 | void put_int(uint16_t action, short val, short width, bx_bool neg)
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79 | {
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80 | short nval = val / 10;
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81 | if (nval)
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82 | put_int(action, nval, width - 1, neg);
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83 | else {
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84 | while (--width > 0)
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85 | send(action, ' ');
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86 | if (neg)
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87 | send(action, '-');
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88 | }
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89 | send(action, val - (nval * 10) + '0');
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90 | }
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91 |
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92 | void put_uint(uint16_t action, unsigned short val, short width, bx_bool neg)
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93 | {
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94 | unsigned short nval = val / 10;
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95 | if (nval)
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96 | put_uint(action, nval, width - 1, neg);
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97 | else {
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98 | while (--width > 0)
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99 | send(action, ' ');
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100 | if (neg)
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101 | send(action, '-');
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102 | }
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103 | send(action, val - (nval * 10) + '0');
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104 | }
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105 |
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106 | void put_luint(uint16_t action, unsigned long val, short width, bx_bool neg)
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107 | {
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108 | unsigned long nval = val / 10;
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109 | if (nval)
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110 | put_luint(action, nval, width - 1, neg);
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111 | else {
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112 | while (--width > 0)
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113 | send(action, ' ');
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114 | if (neg)
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115 | send(action, '-');
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116 | }
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117 | send(action, val - (nval * 10) + '0');
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118 | }
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119 |
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120 | void put_str(uint16_t action, const char __far *s)
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121 | {
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122 | uint8_t c;
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123 |
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124 | while (c = *s) {
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125 | send(action, c);
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126 | s++;
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127 | }
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128 | }
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129 |
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130 | void put_str_near(uint16_t action, const char __near *s)
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131 | {
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132 | uint8_t c;
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133 |
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134 | while (c = *s) {
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135 | send(action, c);
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136 | s++;
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137 | }
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138 | }
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139 |
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140 |
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141 | //--------------------------------------------------------------------------
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142 | // bios_printf()
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143 | // A compact variable argument printf function.
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144 | //
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145 | // Supports %[format_width][length]format
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146 | // where format can be x,X,u,d,s,S,c
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147 | // and the optional length modifier is l (ell, long 32-bit) or ll
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148 | // (long long, 64-bit).
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149 | // Only x,X work with ll
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150 | //--------------------------------------------------------------------------
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151 | void bios_printf(uint16_t action, const char *s, ...)
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152 | {
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153 | uint8_t c;
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154 | bx_bool in_format;
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155 | int i;
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156 | uint16_t arg, nibble, hibyte, format_width, hexadd;
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157 | va_list args;
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158 |
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159 | va_start( args, s );
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160 |
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161 | in_format = 0;
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162 | format_width = 0;
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163 |
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164 | if ((action & BIOS_PRINTF_DEBHALT) == BIOS_PRINTF_DEBHALT) {
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165 | bios_printf (BIOS_PRINTF_SCREEN, "FATAL: ");
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166 | }
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167 |
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168 | while (c = *s) {
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169 | if ( c == '%' ) {
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170 | in_format = 1;
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171 | format_width = 0;
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172 | }
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173 | else if (in_format) {
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174 | if ( (c>='0') && (c<='9') ) {
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175 | format_width = (format_width * 10) + (c - '0');
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176 | }
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177 | else {
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178 | arg = va_arg( args, uint16_t );
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179 | if (c == 'x' || c == 'X') {
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180 | if (format_width == 0)
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181 | format_width = 4;
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182 | if (c == 'x')
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183 | hexadd = 'a';
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184 | else
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185 | hexadd = 'A';
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186 | for (i=format_width-1; i>=0; i--) {
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187 | nibble = (arg >> (4 * i)) & 0x000f;
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188 | send (action, (nibble<=9)? (nibble+'0') : (nibble-10+hexadd));
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189 | }
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190 | }
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191 | else if (c == 'u') {
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192 | put_uint(action, arg, format_width, 0);
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193 | }
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194 | else if (c == 'l' && s[1] == 'l') {
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195 | uint64_t llval;
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196 | uint16_t __far *cp16;
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197 |
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198 | s += 2;
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199 | c = *s;
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200 | cp16 = (uint16_t __far *)&llval;
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201 | cp16[0] = arg;
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202 | cp16[1] = va_arg( args, uint16_t );
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203 | cp16[2] = va_arg( args, uint16_t );
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204 | cp16[3] = va_arg( args, uint16_t );
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205 | if (c == 'x' || c == 'X') {
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206 | if (format_width == 0)
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207 | format_width = 16;
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208 | if (c == 'x')
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209 | hexadd = 'a';
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210 | else
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211 | hexadd = 'A';
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212 | for (i=format_width-1; i>=0; i--) {
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213 | nibble = (llval >> (i * 4)) & 0x000f;
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214 | send (action, (nibble<=9)? (nibble+'0') : (nibble-10+hexadd));
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215 | }
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216 | } else {
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217 | BX_PANIC("bios_printf: unknown %ll format\n");
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218 | }
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219 | }
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220 | else if (c == 'l') {
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221 | s++;
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222 | c = *s; /* is it ld,lx,lu? */
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223 | hibyte = va_arg( args, uint16_t );
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224 | if (c == 'd') {
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225 | if (hibyte & 0x8000)
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226 | put_luint(action, 0L-(((uint32_t) hibyte << 16) | arg), format_width-1, 1);
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227 | else
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228 | put_luint(action, ((uint32_t) hibyte << 16) | arg, format_width, 0);
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229 | }
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230 | else if (c == 'u') {
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231 | put_luint(action, ((uint32_t) hibyte << 16) | arg, format_width, 0);
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232 | }
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233 | else if (c == 'x' || c == 'X')
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234 | {
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235 | if (format_width == 0)
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236 | format_width = 8;
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237 | if (c == 'x')
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238 | hexadd = 'a';
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239 | else
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240 | hexadd = 'A';
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241 | for (i=format_width-1; i>=0; i--) {
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242 | nibble = ((((uint32_t)hibyte << 16) | arg) >> (4 * i)) & 0x000f;
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243 | send (action, (nibble<=9)? (nibble+'0') : (nibble-10+hexadd));
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244 | }
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245 | }
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246 | }
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247 | else if (c == 'd') {
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248 | if (arg & 0x8000)
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249 | put_int(action, -arg, format_width - 1, 1);
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250 | else
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251 | put_int(action, arg, format_width, 0);
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252 | }
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253 | else if (c == 's') {
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254 | put_str(action, (char *)arg);
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255 | }
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256 | else if (c == 'S') {
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257 | hibyte = arg;
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258 | arg = va_arg( args, uint16_t );
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259 | put_str(action, hibyte :> (char *)arg);
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260 | }
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261 | else if (c == 'c') {
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262 | send(action, arg);
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263 | }
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264 | else
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265 | BX_PANIC("bios_printf: unknown format\n");
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266 | in_format = 0;
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267 | }
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268 | }
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269 | else {
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270 | send(action, c);
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271 | }
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272 | ++s;
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273 | }
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274 | va_end( args );
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275 | if (action & BIOS_PRINTF_HALT) {
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276 | // freeze in a busy loop.
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277 | int_disable();
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278 | halt_forever();
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279 | }
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280 | }
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281 |
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282 | // End of printf support
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