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14
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1 #include "kernel.h"
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2
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3 void panic(char *msg) {
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4 printf("Kernel panic: ");
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5 printf(msg);
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6 halt();
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7 }
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8
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9 // Assembler wrapper prototypes:
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10 void INTDEF(void);
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11 void INT0(void);
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12 void INT1(void);
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13 void INT2(void);
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14 void INT3(void);
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15 void INT4(void);
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16 void INT5(void);
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17 void INT6(void);
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18 void INT7(void);
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19 void INT8(void);
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20 void INT9(void);
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21 void INT10(void);
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22 void INT11(void);
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23 void INT12(void);
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24 void INT13(void);
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25 void INT14(void);
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26 void INT15(void);
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27 void INT16(void);
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28 void INT17(void);
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29 void INT18(void);
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30 void INT19(void);
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31 // Remapped handlers:
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32 void INT32(void);
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33 void INT33(void);
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34 void INT34(void);
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35
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36 // THE interrupt descriptor table:
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37 static struct IDT_entry idt[256];
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38
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39 void setIDTentry(int num, void (*handler)())
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40 {
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41 // Fill one entry with IDT info:
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42 uint64_t offset;
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43 unsigned short selector = 0x8; // Code selector
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44 unsigned char type = 0x8E; // 32 bits interrupt gate. Thingy is present
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45
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46 offset = (uint64_t) handler;
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47
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48 idt[num].b[0] = offset & 0xFF;
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49 idt[num].b[1] = (offset >> 8) & 0xFF;
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50 idt[num].b[2] = selector & 0xFF;
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51 idt[num].b[3] = (selector >> 8) & 0xFF;
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52 idt[num].b[4] = 0; // reserved
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53 idt[num].b[5] = type;
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54 idt[num].b[6] = (offset >> 16) & 0xFF;
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55 idt[num].b[7] = (offset >> 24) & 0xFF;
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56 }
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57
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58 void setupIDT(void) {
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59 int i;
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60 // Fill all vectors with the default handler:
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61 for (i=0; i<256; i++) {
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62 setIDTentry(i, &INTDEF);
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63 }
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64
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65 // Now set other then default handler:
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66 setIDTentry(0, INT0);
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67 setIDTentry(1, INT1);
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68 setIDTentry(2, INT2);
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69 setIDTentry(3, INT3);
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70 setIDTentry(4, INT4);
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71 setIDTentry(5, INT5);
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72 setIDTentry(6, INT6);
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73 setIDTentry(7, INT7);
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74 setIDTentry(8, INT8);
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75 setIDTentry(9, INT9);
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76 setIDTentry(10, INT10);
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77 setIDTentry(11, INT11);
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78 setIDTentry(12, INT12);
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79 setIDTentry(13, INT13);
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80 setIDTentry(14, INT14);
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81 setIDTentry(15, INT15);
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82 setIDTentry(16, INT16);
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83 setIDTentry(17, INT17);
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84 setIDTentry(18, INT18);
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85 setIDTentry(19, INT19);
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86 /* reserved interrupts: */
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87 // From int20 - int31
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88 setIDTentry(32, INT32);
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89 setIDTentry(33, INT33);
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90 setIDTentry(34, INT34);
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91
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92 // call load IDT asm function:
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93 loadIDT(idt, 256*8-1);
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94
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95 PICremap();
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96 enableinterrupts();
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97 }
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98
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99 // PIC functions:
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100 void PICremap() {
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101 unsigned char maskmaster, maskslave, pic1, pic2;
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102 pic1 = 0x20; // remapping location master
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103 pic2 = 0x28;
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104 maskmaster = inb(0x21); // master cmd=0x20, data=0x21
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105 maskslave = inb(0xA1); // slave command=0xA0, data=0xA1
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106
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107 outb(0x20, 0x20); // end of init
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108
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109 outb(0x20, 0x11); // init + ICW1_ICW2
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110 outb(0xA0, 0x11); // init + ICW1_ICW2
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111
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112 outb(0x21, pic1); // ICW2, write offset
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113 outb(0xA1, pic2); // ICW2
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114
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115 outb(0x21, 4); // ICW3, write a 4!
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116 outb(0xA1, 2); // ICW3, write a 2!
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117
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118 outb(0x21, 1); // ICW4, 8086 mode
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119 outb(0xA1, 1); // ICW4
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120
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121 outb(0x21, maskmaster);
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122 outb(0xA1, maskslave);
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123 }
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124
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125 // Interrupt service routines:
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126
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127 void INT0handler()
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128 {
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129 printf("INT0 called!\n");
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130 panic("Unhandled exception!");
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131 }
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132
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133 void INT1handler()
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134 {
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135 printf("INT1 called!\n");
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136 panic("Unhandled exception!");
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137 }
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138
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139 void INT2handler()
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140 {
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141 printf("INT2 called!\n");
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142 panic("Unhandled exception!");
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143 }
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144
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145 void INT3handler()
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146 {
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147 printf("INT3 called!\n");
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148 panic("Unhandled exception!");
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149 }
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150
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151 void INT4handler()
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152 {
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153 printf("INT4 called!\n");
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154 panic("Unhandled exception!");
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155 }
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156
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157 void INT5handler()
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158 {
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159 printf("INT5 called!\n");
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160 panic("Unhandled exception!");
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161 }
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162
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163 void INT6handler()
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164 {
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165 printf("INT6 called!\n");
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166 panic("Unhandled exception!");
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167 }
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168
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169 void INT7handler()
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170 {
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171 printf("INT7 called!\n");
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172 panic("Unhandled exception!");
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173 }
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174
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175 void INT8handler()
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176 {
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177 printf("INT8 called!\n");
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178 panic("Unhandled exception!");
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179 }
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180
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181 void INT9handler()
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182 {
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183 printf("INT9 called!\n");
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184 panic("Unhandled exception!");
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185 }
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186
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187 void INT10handler()
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188 {
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189 printf("INT10 called!\n");
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190 panic("Unhandled exception!");
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191 }
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192
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193 void INT11handler()
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194 {
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195 printf("INT11 called!\n");
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196 panic("Unhandled exception!");
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197 }
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198
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199 void INT12handler()
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200 {
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201 printf("INT12 called!\n");
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202 panic("Unhandled exception!");
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203 }
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204
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205 void INT13handler()
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206 {
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207 printf("INT13 called!\n");
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208 panic("Unhandled exception!");
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209 }
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210
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211 void* getUnusedPage() {
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212 return 0;
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213
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214 }
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215
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216 void mappage(uint32_t address) {
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217 uint32_t pageDirIndex = address >> 22;
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218 uint32_t pageTableIndex = (address >> 12) & 0x3FF;
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219
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220 printf("Allocating page at %d, tableindex=%d\n", pageDirIndex, pageTableIndex);
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221 //uint32_t *pageTable = (uint32_t*)(pageDirectory[pageDirIndex] & 0xFFFFFC00);
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222
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223
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224 }
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225
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226 void INT14handler(unsigned int address)
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227 {
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228 printf("INT14 called! Page fault for address 0x%x!\n", address);
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229 if ( (address & 0xF0000000) == 0xD0000000 ) {
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230 mappage(address & 0xFFFFF000);
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231 return;
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232 }
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233
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234 panic("Unhandled exception!");
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235 }
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236
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237 void INT15handler()
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238 {
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239 printf("INT15 called!\n");
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240 panic("Unhandled exception!");
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241 }
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242
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243 void INT16handler()
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244 {
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245 printf("INT16 called!\n");
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246 panic("Unhandled exception!");
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247 }
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248
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249 void INT17handler()
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250 {
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251 printf("INT17 called!\n");
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252 panic("Unhandled exception!");
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253 }
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254
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255 void INT18handler()
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256 {
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257 printf("INT18 called!\n");
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258 panic("Unhandled exception!");
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259 }
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260
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261 void INT19handler()
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262 {
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263 printf("INT19 called!\n");
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264 panic("Unhandled exception!");
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265 }
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266
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267 // remapped IRQ from master PIC:
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268 void INT32handler()
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269 {
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270 // System timer.
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271 //printf("INT32 called!\n");
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272 // called very frequent, what is this?
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273 timerDriverUpdate();
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274 outb(0x20, 0x20); // EOI to master
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275 }
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276
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277 void INT33handler()
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278 {
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279 //printf("INT33 called, key pressed????\n");
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280 unsigned char scancode = inb(0x60);
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281 //printf("Scancode = 0x%x\n", scancode);
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282 keyboardDriverUpdate(scancode);
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283 outb(0x20, 0x20); // EOI to master
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284 }
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285
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286 void INT34handler()
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287 {
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288 printf("INT34 called!\n");
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289 }
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290
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291 void INTDEF_handler()
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292 {
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293 printf("Default int handler called\n");
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294 }
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295
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296
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