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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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50
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15
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16 #include "../context.h"
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17
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52
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18 #define __ncode __code
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19
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20 __ncode cbc_consoleread1 ();
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21 __ncode cbc_consoleread2 ();
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31
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22
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0
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23 static void consputc (int);
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24
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25 static int panicked = 0;
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26
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27 static struct {
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28 struct spinlock lock;
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29 int locking;
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30 } cons;
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31
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32 static void printint (int xx, int base, int sign)
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33 {
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34 static char digits[] = "0123456789abcdef";
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35 char buf[16];
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36 int i;
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37 uint x;
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38
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39 if (sign && (sign = xx < 0)) {
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40 x = -xx;
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41 } else {
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42 x = xx;
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43 }
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44
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45 i = 0;
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46
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47 do {
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48 buf[i++] = digits[x % base];
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49 } while ((x /= base) != 0);
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50
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51 if (sign) {
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52 buf[i++] = '-';
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53 }
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54
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55 while (--i >= 0) {
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56 consputc(buf[i]);
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57 }
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58 }
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59 //PAGEBREAK: 50
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60
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61 // Print to the console. only understands %d, %x, %p, %s.
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62 void cprintf (char *fmt, ...)
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63 {
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64 int i, c, locking;
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65 uint *argp;
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66 char *s;
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67
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68 locking = cons.locking;
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69
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70 if (locking) {
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71 acquire(&cons.lock);
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72 }
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73
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74 if (fmt == 0) {
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75 panic("null fmt");
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76 }
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77
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78 argp = (uint*) (void*) (&fmt + 1);
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79
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80 for (i = 0; (c = fmt[i] & 0xff) != 0; i++) {
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81 if (c != '%') {
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82 consputc(c);
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83 continue;
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84 }
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85
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86 c = fmt[++i] & 0xff;
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87
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88 if (c == 0) {
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89 break;
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90 }
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91
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92 switch (c) {
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93 case 'd':
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94 printint(*argp++, 10, 1);
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95 break;
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96
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97 case 'x':
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98 case 'p':
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99 printint(*argp++, 16, 0);
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100 break;
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101
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102 case 's':
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103 if ((s = (char*) *argp++) == 0) {
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104 s = "(null)";
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105 }
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106
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107 for (; *s; s++) {
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108 consputc(*s);
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109 }
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110 break;
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111
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112 case '%':
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113 consputc('%');
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114 break;
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115
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116 default:
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117 // Print unknown % sequence to draw attention.
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118 consputc('%');
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119 consputc(c);
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120 break;
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121 }
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122 }
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123
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124 if (locking) {
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125 release(&cons.lock);
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126 }
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127 }
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128
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52
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129 __ncode cbc_panic (char *s)
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30
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130 {
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131 cli();
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132
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133 cons.locking = 0;
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134
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135 cprintf("cpu%d: panic: ", cpu->id);
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136
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137 show_callstk(s);
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138 panicked = 1; // freeze other CPU
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139
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140 while (1)
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141 ;
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142 }
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143
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0
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144 void panic (char *s)
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145 {
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146 cli();
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147
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148 cons.locking = 0;
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149
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150 cprintf("cpu%d: panic: ", cpu->id);
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151
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152 show_callstk(s);
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153 panicked = 1; // freeze other CPU
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154
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155 while (1)
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156 ;
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157 }
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158
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159 //PAGEBREAK: 50
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160 #define BACKSPACE 0x100
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161 #define CRTPORT 0x3d4
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162
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163 void consputc (int c)
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164 {
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165 if (panicked) {
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166 cli();
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167 while (1)
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168 ;
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169 }
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170
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171 if (c == BACKSPACE) {
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172 uartputc('\b');
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173 uartputc(' ');
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174 uartputc('\b');
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175 } else {
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176 uartputc(c);
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177 }
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178
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179 // cgaputc(c);
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180 }
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181
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182 #define INPUT_BUF 512
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183 struct {
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184 struct spinlock lock;
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185 char buf[INPUT_BUF];
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186 uint r; // Read index
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187 uint w; // Write index
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188 uint e; // Edit index
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189 } input;
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190
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191 #define C(x) ((x)-'@') // Control-x
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192 void consoleintr (int (*getc) (void))
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193 {
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194 int c;
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195
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196 acquire(&input.lock);
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197
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198 while ((c = getc()) >= 0) {
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199 switch (c) {
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200 case C('P'): // Process listing.
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201 procdump();
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202 break;
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203
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204 case C('U'): // Kill line.
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205 while ((input.e != input.w) && (input.buf[(input.e - 1) % INPUT_BUF] != '\n')) {
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206 input.e--;
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207 consputc(BACKSPACE);
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208 }
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209
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210 break;
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211
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212 case C('H'):
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213 case '\x7f': // Backspace
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214 if (input.e != input.w) {
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215 input.e--;
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216 consputc(BACKSPACE);
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217 }
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218
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219 break;
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220
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221 default:
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222 if ((c != 0) && (input.e - input.r < INPUT_BUF)) {
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223 c = (c == '\r') ? '\n' : c;
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224
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225 input.buf[input.e++ % INPUT_BUF] = c;
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226 consputc(c);
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227
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228 if (c == '\n' || c == C('D') || input.e == input.r + INPUT_BUF) {
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229 input.w = input.e;
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230 wakeup(&input.r);
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231 }
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232 }
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233
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234 break;
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235 }
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236 }
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237
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238 release(&input.lock);
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239 }
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240
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52
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241 __ncode cbc_consoleread2()
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31
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242 {
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243 struct inode *ip = proc->cbc_arg.cbc_console_arg.ip;
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52
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244 __code (*next)(int ret) = proc->cbc_arg.cbc_console_arg.next;
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31
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245 if (input.r == input.w) {
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246 if (proc->killed) {
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247 release(&input.lock);
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248 ilock(ip);
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249 goto next(-1);
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250 }
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251 goto cbc_sleep(&input.r, &input.lock, cbc_consoleread2);
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252 }
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32
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253 goto cbc_consoleread1();
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31
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254 }
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255
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52
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256 __ncode cbc_consoleread1()
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24
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257 {
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258 int cont = 1;
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26
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259 int n = proc->cbc_arg.cbc_console_arg.n;
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260 int target = proc->cbc_arg.cbc_console_arg.target;
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261 char* dst = proc->cbc_arg.cbc_console_arg.dst;
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262 struct inode *ip = proc->cbc_arg.cbc_console_arg.ip;
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52
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263 __code (*next)(int ret) = proc->cbc_arg.cbc_console_arg.next;
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24
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264
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26
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265 int c = input.buf[input.r++ % INPUT_BUF];
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24
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266
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31
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267 if (c == C('D')) { // EOF
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268 if (n < target) {
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269 // Save ^D for next time, to make sure
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270 // caller gets a 0-byte result.
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271 input.r--;
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272 }
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273 cont = 0;
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274 }
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24
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275
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31
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276 *dst++ = c;
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277 --n;
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24
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278
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31
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279 if (c == '\n') {
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280 cont = 0;
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281 }
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24
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282
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32
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283 if (cont == 1) {
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284 if (n > 0) {
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285 proc->cbc_arg.cbc_console_arg.n = n;
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286 proc->cbc_arg.cbc_console_arg.target = target;
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287 proc->cbc_arg.cbc_console_arg.dst = dst;
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288 proc->cbc_arg.cbc_console_arg.ip = ip;
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289 proc->cbc_arg.cbc_console_arg.next = next;
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290 goto cbc_sleep(&input.r, &input.lock, cbc_consoleread2);
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291 }
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24
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292 }
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293
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294 release(&input.lock);
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295 ilock(ip);
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296
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33
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297 goto next(target - n);
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24
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298 }
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299
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52
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300 __ncode cbc_consoleread(struct inode *ip, char *dst, int n, __code(*next)(int ret))
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29
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301 {
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302 uint target;
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303
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304 iunlock(ip);
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305
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306 target = n;
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307 acquire(&input.lock);
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308
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31
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309 if (n > 0) {
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310 proc->cbc_arg.cbc_console_arg.n = n;
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311 proc->cbc_arg.cbc_console_arg.target = target;
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34
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312 proc->cbc_arg.cbc_console_arg.dst = dst;
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313 proc->cbc_arg.cbc_console_arg.ip = ip;
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314 proc->cbc_arg.cbc_console_arg.next = next;
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315 goto cbc_consoleread2();
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316 }
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33
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317 goto cbc_consoleread1();
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29
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318 }
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319
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0
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320 int consoleread (struct inode *ip, char *dst, int n)
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321 {
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322 uint target;
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323 int c;
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324
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325 iunlock(ip);
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326
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327 target = n;
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328 acquire(&input.lock);
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329
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330 while (n > 0) {
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331 while (input.r == input.w) {
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332 if (proc->killed) {
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333 release(&input.lock);
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334 ilock(ip);
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335 return -1;
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336 }
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337
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338 sleep(&input.r, &input.lock);
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339 }
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340
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341 c = input.buf[input.r++ % INPUT_BUF];
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342
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343 if (c == C('D')) { // EOF
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344 if (n < target) {
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345 // Save ^D for next time, to make sure
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346 // caller gets a 0-byte result.
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347 input.r--;
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348 }
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349
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350 break;
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351 }
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352
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353 *dst++ = c;
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354 --n;
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355
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356 if (c == '\n') {
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357 break;
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358 }
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359 }
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360
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361 release(&input.lock);
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362 ilock(ip);
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363
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364 return target - n;
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365 }
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366
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367 int consolewrite (struct inode *ip, char *buf, int n)
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368 {
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369 int i;
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370
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371 iunlock(ip);
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372
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373 acquire(&cons.lock);
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374
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375 for (i = 0; i < n; i++) {
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376 consputc(buf[i] & 0xff);
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377 }
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378
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379 release(&cons.lock);
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380
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381 ilock(ip);
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382
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383 return n;
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384 }
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385
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386 void consoleinit (void)
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387 {
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388 initlock(&cons.lock, "console");
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389 initlock(&input.lock, "input");
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390
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391 devsw[CONSOLE].write = consolewrite;
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392 devsw[CONSOLE].read = consoleread;
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27
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393 //cbc_devsw[CONSOLE].write = cbc_consolewrite;
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24
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394 cbc_devsw[CONSOLE].read = cbc_consoleread;
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0
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395
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396 cons.locking = 1;
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397 }
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398
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