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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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32
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15 __code cbc_consoleread1 ();
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16 __code cbc_consoleread2 ();
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31
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17
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0
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18 static void consputc (int);
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19
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20 static int panicked = 0;
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21
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22 static struct {
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23 struct spinlock lock;
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24 int locking;
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25 } cons;
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26
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27 static void printint (int xx, int base, int sign)
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28 {
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29 static char digits[] = "0123456789abcdef";
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30 char buf[16];
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31 int i;
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32 uint x;
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33
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34 if (sign && (sign = xx < 0)) {
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35 x = -xx;
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36 } else {
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37 x = xx;
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38 }
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39
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40 i = 0;
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41
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42 do {
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43 buf[i++] = digits[x % base];
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44 } while ((x /= base) != 0);
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45
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46 if (sign) {
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47 buf[i++] = '-';
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48 }
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49
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50 while (--i >= 0) {
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51 consputc(buf[i]);
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52 }
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53 }
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54 //PAGEBREAK: 50
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55
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56 // Print to the console. only understands %d, %x, %p, %s.
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57 void cprintf (char *fmt, ...)
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58 {
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59 int i, c, locking;
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60 uint *argp;
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61 char *s;
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62
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63 locking = cons.locking;
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64
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65 if (locking) {
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66 acquire(&cons.lock);
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67 }
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68
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69 if (fmt == 0) {
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70 panic("null fmt");
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71 }
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72
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73 argp = (uint*) (void*) (&fmt + 1);
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74
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75 for (i = 0; (c = fmt[i] & 0xff) != 0; i++) {
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76 if (c != '%') {
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77 consputc(c);
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78 continue;
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79 }
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80
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81 c = fmt[++i] & 0xff;
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82
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83 if (c == 0) {
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84 break;
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85 }
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86
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87 switch (c) {
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88 case 'd':
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89 printint(*argp++, 10, 1);
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90 break;
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91
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92 case 'x':
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93 case 'p':
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94 printint(*argp++, 16, 0);
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95 break;
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96
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97 case 's':
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98 if ((s = (char*) *argp++) == 0) {
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99 s = "(null)";
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100 }
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101
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102 for (; *s; s++) {
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103 consputc(*s);
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104 }
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105 break;
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106
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107 case '%':
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108 consputc('%');
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109 break;
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110
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111 default:
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112 // Print unknown % sequence to draw attention.
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113 consputc('%');
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114 consputc(c);
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115 break;
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116 }
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117 }
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118
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119 if (locking) {
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120 release(&cons.lock);
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121 }
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122 }
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123
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30
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124 __code cbc_panic (char *s)
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125 {
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126 cli();
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127
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128 cons.locking = 0;
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129
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130 cprintf("cpu%d: panic: ", cpu->id);
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131
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132 show_callstk(s);
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133 panicked = 1; // freeze other CPU
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134
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135 while (1)
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136 ;
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137 }
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138
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0
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139 void panic (char *s)
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140 {
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141 cli();
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142
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143 cons.locking = 0;
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144
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145 cprintf("cpu%d: panic: ", cpu->id);
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146
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147 show_callstk(s);
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148 panicked = 1; // freeze other CPU
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149
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150 while (1)
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151 ;
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152 }
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153
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154 //PAGEBREAK: 50
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155 #define BACKSPACE 0x100
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156 #define CRTPORT 0x3d4
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157
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158 void consputc (int c)
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159 {
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160 if (panicked) {
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161 cli();
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162 while (1)
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163 ;
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164 }
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165
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166 if (c == BACKSPACE) {
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167 uartputc('\b');
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168 uartputc(' ');
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169 uartputc('\b');
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170 } else {
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171 uartputc(c);
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172 }
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173
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174 // cgaputc(c);
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175 }
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176
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177 #define INPUT_BUF 512
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178 struct {
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179 struct spinlock lock;
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180 char buf[INPUT_BUF];
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181 uint r; // Read index
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182 uint w; // Write index
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183 uint e; // Edit index
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184 } input;
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185
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186 #define C(x) ((x)-'@') // Control-x
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187 void consoleintr (int (*getc) (void))
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188 {
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189 int c;
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190
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191 acquire(&input.lock);
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192
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193 while ((c = getc()) >= 0) {
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194 switch (c) {
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195 case C('P'): // Process listing.
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196 procdump();
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197 break;
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198
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199 case C('U'): // Kill line.
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200 while ((input.e != input.w) && (input.buf[(input.e - 1) % INPUT_BUF] != '\n')) {
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201 input.e--;
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202 consputc(BACKSPACE);
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203 }
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204
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205 break;
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206
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207 case C('H'):
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208 case '\x7f': // Backspace
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209 if (input.e != input.w) {
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210 input.e--;
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211 consputc(BACKSPACE);
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212 }
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213
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214 break;
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215
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216 default:
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217 if ((c != 0) && (input.e - input.r < INPUT_BUF)) {
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218 c = (c == '\r') ? '\n' : c;
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219
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220 input.buf[input.e++ % INPUT_BUF] = c;
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221 consputc(c);
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222
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223 if (c == '\n' || c == C('D') || input.e == input.r + INPUT_BUF) {
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224 input.w = input.e;
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225 wakeup(&input.r);
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226 }
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227 }
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228
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229 break;
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230 }
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231 }
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232
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233 release(&input.lock);
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234 }
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235
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32
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236 __code cbc_consoleread2 ()
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31
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237 {
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238 struct inode *ip = proc->cbc_arg.cbc_console_arg.ip;
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32
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239 __code(*next)(int ret) = proc->cbc_arg.cbc_console_arg.next;
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31
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240 if (input.r == input.w) {
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241 if (proc->killed) {
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242 release(&input.lock);
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243 ilock(ip);
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244 goto next(-1);
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245 }
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246 goto cbc_sleep(&input.r, &input.lock, cbc_consoleread2);
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247 }
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32
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248 goto cbc_consoleread1();
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31
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249 }
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250
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32
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251 __code cbc_consoleread1 ()
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24
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252 {
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253 int cont = 1;
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26
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254 int n = proc->cbc_arg.cbc_console_arg.n;
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255 int target = proc->cbc_arg.cbc_console_arg.target;
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256 char* dst = proc->cbc_arg.cbc_console_arg.dst;
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257 struct inode *ip = proc->cbc_arg.cbc_console_arg.ip;
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32
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258 __code(*next)(int ret) = proc->cbc_arg.cbc_console_arg.next;
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24
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259
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26
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260 int c = input.buf[input.r++ % INPUT_BUF];
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24
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261
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31
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262 if (c == C('D')) { // EOF
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263 if (n < target) {
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264 // Save ^D for next time, to make sure
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265 // caller gets a 0-byte result.
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266 input.r--;
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267 }
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268 cont = 0;
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269 }
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24
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270
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31
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271 *dst++ = c;
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272 --n;
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24
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273
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31
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274 if (c == '\n') {
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275 cont = 0;
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276 }
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24
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277
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32
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278 if (cont == 1) {
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279 if (n > 0) {
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280 proc->cbc_arg.cbc_console_arg.n = n;
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281 proc->cbc_arg.cbc_console_arg.target = target;
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282 proc->cbc_arg.cbc_console_arg.dst = dst;
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283 proc->cbc_arg.cbc_console_arg.ip = ip;
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284 proc->cbc_arg.cbc_console_arg.next = next;
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285 goto cbc_sleep(&input.r, &input.lock, cbc_consoleread2);
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286 }
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24
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287 }
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288
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289 release(&input.lock);
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290 ilock(ip);
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291
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33
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292 goto next(target - n);
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24
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293 }
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294
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33
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295 __code cbc_consoleread (struct inode *ip, char *dst, int n, __code(*next)(int ret))
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29
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296 {
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297 uint target;
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298
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299 iunlock(ip);
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300
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301 target = n;
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302 acquire(&input.lock);
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303
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31
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304 if (n > 0) {
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305 proc->cbc_arg.cbc_console_arg.n = n;
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306 proc->cbc_arg.cbc_console_arg.target = target;
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34
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307 proc->cbc_arg.cbc_console_arg.dst = dst;
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308 proc->cbc_arg.cbc_console_arg.ip = ip;
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309 proc->cbc_arg.cbc_console_arg.next = next;
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310 goto cbc_consoleread2();
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311 }
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33
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312 goto cbc_consoleread1();
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29
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313 }
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314
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0
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315 int consoleread (struct inode *ip, char *dst, int n)
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316 {
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317 uint target;
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318 int c;
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319
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320 iunlock(ip);
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321
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322 target = n;
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323 acquire(&input.lock);
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324
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325 while (n > 0) {
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326 while (input.r == input.w) {
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327 if (proc->killed) {
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328 release(&input.lock);
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329 ilock(ip);
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330 return -1;
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331 }
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332
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333 sleep(&input.r, &input.lock);
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334 }
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335
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336 c = input.buf[input.r++ % INPUT_BUF];
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337
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338 if (c == C('D')) { // EOF
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339 if (n < target) {
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340 // Save ^D for next time, to make sure
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341 // caller gets a 0-byte result.
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342 input.r--;
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343 }
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344
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345 break;
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346 }
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347
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348 *dst++ = c;
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349 --n;
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350
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351 if (c == '\n') {
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352 break;
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353 }
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354 }
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355
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356 release(&input.lock);
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357 ilock(ip);
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358
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359 return target - n;
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360 }
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361
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362 int consolewrite (struct inode *ip, char *buf, int n)
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363 {
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364 int i;
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365
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366 iunlock(ip);
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367
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368 acquire(&cons.lock);
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369
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370 for (i = 0; i < n; i++) {
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371 consputc(buf[i] & 0xff);
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372 }
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373
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374 release(&cons.lock);
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375
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376 ilock(ip);
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377
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378 return n;
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379 }
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380
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381 void consoleinit (void)
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382 {
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383 initlock(&cons.lock, "console");
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384 initlock(&input.lock, "input");
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385
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386 devsw[CONSOLE].write = consolewrite;
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387 devsw[CONSOLE].read = consoleread;
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27
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388 //cbc_devsw[CONSOLE].write = cbc_consolewrite;
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24
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389 cbc_devsw[CONSOLE].read = cbc_consoleread;
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0
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390
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391 cons.locking = 1;
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392 }
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393
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