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1 // Console input and output.
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2 // Input is from the keyboard or serial port.
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3 // Output is written to the screen and serial port.
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4
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5 #include "types.h"
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6 #include "defs.h"
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7 #include "param.h"
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8 #include "spinlock.h"
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9 #include "fs.h"
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10 #include "file.h"
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11 #include "memlayout.h"
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12 #include "mmu.h"
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13 #include "proc.h"
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14
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15 static void consputc (int);
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16
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17 static int panicked = 0;
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18
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19 static struct {
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20 struct spinlock lock;
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21 int locking;
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22 } cons;
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23
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24 static void printint (int xx, int base, int sign)
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25 {
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26 static char digits[] = "0123456789abcdef";
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27 char buf[16];
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28 int i;
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29 uint x;
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30
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31 if (sign && (sign = xx < 0)) {
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32 x = -xx;
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33 } else {
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34 x = xx;
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35 }
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36
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37 i = 0;
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38
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39 do {
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40 buf[i++] = digits[x % base];
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41 } while ((x /= base) != 0);
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42
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43 if (sign) {
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44 buf[i++] = '-';
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45 }
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46
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47 while (--i >= 0) {
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48 consputc(buf[i]);
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49 }
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50 }
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51 //PAGEBREAK: 50
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52
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53 // Print to the console. only understands %d, %x, %p, %s.
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54 void cprintf (char *fmt, ...)
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55 {
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56 int i, c, locking;
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57 uint *argp;
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58 char *s;
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59
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60 locking = cons.locking;
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61
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62 if (locking) {
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63 acquire(&cons.lock);
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64 }
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65
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66 if (fmt == 0) {
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67 panic("null fmt");
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68 }
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69
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70 argp = (uint*) (void*) (&fmt + 1);
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71
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72 for (i = 0; (c = fmt[i] & 0xff) != 0; i++) {
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73 if (c != '%') {
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74 consputc(c);
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75 continue;
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76 }
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77
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78 c = fmt[++i] & 0xff;
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79
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80 if (c == 0) {
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81 break;
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82 }
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83
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84 switch (c) {
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85 case 'd':
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86 printint(*argp++, 10, 1);
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87 break;
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88
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89 case 'x':
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90 case 'p':
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91 printint(*argp++, 16, 0);
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92 break;
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93
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94 case 's':
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95 if ((s = (char*) *argp++) == 0) {
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96 s = "(null)";
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97 }
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98
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99 for (; *s; s++) {
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100 consputc(*s);
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101 }
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102 break;
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103
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104 case '%':
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105 consputc('%');
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106 break;
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107
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108 default:
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109 // Print unknown % sequence to draw attention.
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110 consputc('%');
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111 consputc(c);
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112 break;
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113 }
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114 }
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115
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116 if (locking) {
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117 release(&cons.lock);
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118 }
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119 }
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120
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121 void panic (char *s)
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122 {
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123 cli();
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124
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125 cons.locking = 0;
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126
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127 cprintf("cpu%d: panic: ", cpu->id);
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128
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129 show_callstk(s);
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130 panicked = 1; // freeze other CPU
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131
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132 while (1)
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133 ;
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134 }
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135
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136 //PAGEBREAK: 50
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137 #define BACKSPACE 0x100
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138 #define CRTPORT 0x3d4
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139
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140 void consputc (int c)
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141 {
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142 if (panicked) {
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143 cli();
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144 while (1)
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145 ;
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146 }
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147
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148 if (c == BACKSPACE) {
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149 uartputc('\b');
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150 uartputc(' ');
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151 uartputc('\b');
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152 } else {
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153 uartputc(c);
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154 }
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155
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156 // cgaputc(c);
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157 }
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158
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159 #define INPUT_BUF 512
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160 struct {
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161 struct spinlock lock;
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162 char buf[INPUT_BUF];
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163 uint r; // Read index
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164 uint w; // Write index
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165 uint e; // Edit index
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166 } input;
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167
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168 #define C(x) ((x)-'@') // Control-x
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169 void consoleintr (int (*getc) (void))
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170 {
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171 int c;
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172
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173 acquire(&input.lock);
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174
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175 while ((c = getc()) >= 0) {
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176 switch (c) {
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177 case C('P'): // Process listing.
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178 procdump();
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179 break;
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180
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181 case C('U'): // Kill line.
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182 while ((input.e != input.w) && (input.buf[(input.e - 1) % INPUT_BUF] != '\n')) {
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183 input.e--;
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184 consputc(BACKSPACE);
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185 }
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186
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187 break;
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188
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189 case C('H'):
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190 case '\x7f': // Backspace
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191 if (input.e != input.w) {
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192 input.e--;
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193 consputc(BACKSPACE);
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194 }
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195
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196 break;
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197
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198 default:
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199 if ((c != 0) && (input.e - input.r < INPUT_BUF)) {
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200 c = (c == '\r') ? '\n' : c;
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201
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202 input.buf[input.e++ % INPUT_BUF] = c;
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203 consputc(c);
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204
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205 if (c == '\n' || c == C('D') || input.e == input.r + INPUT_BUF) {
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206 input.w = input.e;
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207 wakeup(&input.r);
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208 }
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209 }
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210
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211 break;
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212 }
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213 }
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214
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215 release(&input.lock);
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216 }
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217
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24
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218 __code cbc_consoleread1 (__code(*next)(int ret))
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219 {
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220 int cont = 1;
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26
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221 int n = proc->cbc_arg.cbc_console_arg.n;
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222 int target = proc->cbc_arg.cbc_console_arg.target;
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223 char* dst = proc->cbc_arg.cbc_console_arg.dst;
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224 struct inode *ip = proc->cbc_arg.cbc_console_arg.ip;
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24
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225
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226 int c = input.buf[input.r++ % INPUT_BUF];
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24
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227
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228 if (c == C('D')) { // EOF
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229 if (n < target) {
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230 // Save ^D for next time, to make sure
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231 // caller gets a 0-byte result.
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232 input.r--;
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233 }
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234 cont = 0;
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235 }
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236
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237 *dst++ = c;
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238 --n;
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239
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240 if (c == '\n') {
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241 cont = 0;
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242 }
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243
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244
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245 if (cont){
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246 proc->cbc_arg.cbc_console_arg.n = n;
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247 proc->cbc_arg.cbc_console_arg.dst = dst;
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248 proc->cbc_arg.cbc_console_arg.ip = ip;
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249 proc->cbc_arg.cbc_console_arg.next = next;
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250 goto cbc_sleep(&input.r, &input.lock, cbc_consoleread1);
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251 }
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252
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253 release(&input.lock);
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254 ilock(ip);
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255
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256 goto next(target - n);
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257 }
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258
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259 __code cbc_consoleread (struct inode *ip, char *dst, int n, __code(*next)(int ret))
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260 {
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261 uint target;
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262
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263 iunlock(ip);
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264
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265 target = n;
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266 acquire(&input.lock);
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267
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268 while (n > 0) {
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269 while (input.r == input.w) {
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270 if (proc->killed) {
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271 release(&input.lock);
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272 ilock(ip);
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273 goto next(-1);
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274 }
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275
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276 proc->cbc_arg.cbc_console_arg.n = n;
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277 proc->cbc_arg.cbc_console_arg.target = target;
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278 proc->cbc_arg.cbc_console_arg.dst = dst;
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279 proc->cbc_arg.cbc_console_arg.ip = ip;
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280 proc->cbc_arg.cbc_console_arg.next = next;
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281 goto cbc_sleep(&input.r, &input.lock, cbc_consoleread1);
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282 }
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283 }
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284 }
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285
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0
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286 int consoleread (struct inode *ip, char *dst, int n)
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287 {
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288 uint target;
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289 int c;
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290
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291 iunlock(ip);
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292
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293 target = n;
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294 acquire(&input.lock);
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295
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296 while (n > 0) {
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297 while (input.r == input.w) {
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298 if (proc->killed) {
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299 release(&input.lock);
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300 ilock(ip);
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301 return -1;
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302 }
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303
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304 sleep(&input.r, &input.lock);
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305 }
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306
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307 c = input.buf[input.r++ % INPUT_BUF];
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308
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309 if (c == C('D')) { // EOF
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310 if (n < target) {
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311 // Save ^D for next time, to make sure
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312 // caller gets a 0-byte result.
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313 input.r--;
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314 }
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315
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316 break;
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317 }
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318
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319 *dst++ = c;
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320 --n;
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321
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322 if (c == '\n') {
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323 break;
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324 }
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325 }
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326
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327 release(&input.lock);
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328 ilock(ip);
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329
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330 return target - n;
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331 }
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332
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333 int consolewrite (struct inode *ip, char *buf, int n)
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334 {
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335 int i;
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336
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337 iunlock(ip);
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338
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339 acquire(&cons.lock);
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340
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341 for (i = 0; i < n; i++) {
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342 consputc(buf[i] & 0xff);
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343 }
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344
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345 release(&cons.lock);
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346
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347 ilock(ip);
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348
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349 return n;
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350 }
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351
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352 void consoleinit (void)
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353 {
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354 initlock(&cons.lock, "console");
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355 initlock(&input.lock, "input");
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356
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357 devsw[CONSOLE].write = consolewrite;
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358 devsw[CONSOLE].read = consoleread;
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27
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359 //cbc_devsw[CONSOLE].write = cbc_consolewrite;
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24
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360 cbc_devsw[CONSOLE].read = cbc_consoleread;
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0
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361
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362 cons.locking = 1;
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363 }
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364
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