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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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17
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37 static IDT_entry idt[256];
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38 volatile idtPointer idtP;
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39
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40 void setIDTentry(int num, void (*handler)(), uint16_t selector, uint8_t flags)
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41 {
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42 // Fill one entry with IDT info:
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43 uint64_t offset;
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44
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17
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45 // Typecast the function pointer to a number:
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46 offset = (uint64_t)handler;
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47
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48 // Set offset:
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49 idt[num].baseLow = offset & 0xFFFF;
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50 idt[num].baseMid = (offset >> 16) & 0xFFFF;
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51 idt[num].baseHigh = (offset >> 32) & 0xFFFFFFFF;
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52
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53 // Set flags and selector:
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54 idt[num].selector = selector;
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55 idt[num].flags = flags;
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56
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57 // Set reserved fields:
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58 idt[num].reserved1 = 0;
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59 idt[num].reserved2 = 0;
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14
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60 }
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61
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62 void setupIDT(void) {
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63 int i;
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64 // Fill all vectors with the default handler:
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65 for (i=0; i<256; i++) {
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66 setIDTentry(i, &INTDEF, 0x08, 0x8E);
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67 }
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68
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69 // Now set other then default handler:
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70 setIDTentry(0, INT0, 0x08, 0x8E);
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71 setIDTentry(1, INT1, 0x08, 0x8E);
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72 setIDTentry(2, INT2, 0x08, 0x8E);
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73 setIDTentry(3, INT3, 0x08, 0x8E);
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74 setIDTentry(4, INT4, 0x08, 0x8E);
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75 setIDTentry(5, INT5, 0x08, 0x8E);
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76 setIDTentry(6, INT6, 0x08, 0x8E);
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77 setIDTentry(7, INT7, 0x08, 0x8E);
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78 setIDTentry(8, INT8, 0x08, 0x8E);
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79 setIDTentry(9, INT9, 0x08, 0x8E);
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80 setIDTentry(10, INT10, 0x08, 0x8E);
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81 setIDTentry(11, INT11, 0x08, 0x8E);
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82 setIDTentry(12, INT12, 0x08, 0x8E);
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83 setIDTentry(13, INT13, 0x08, 0x8E);
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84 setIDTentry(14, INT14, 0x08, 0x8E);
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85 setIDTentry(15, INT15, 0x08, 0x8E);
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86 setIDTentry(16, INT16, 0x08, 0x8E);
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87 setIDTentry(17, INT17, 0x08, 0x8E);
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88 setIDTentry(18, INT18, 0x08, 0x8E);
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89 setIDTentry(19, INT19, 0x08, 0x8E);
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90 /* reserved interrupts: */
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91 // From int20 - int31
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92 setIDTentry(32, INT32, 0x08, 0x8E);
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93 setIDTentry(33, INT33, 0x08, 0x8E);
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94 setIDTentry(34, INT34, 0x08, 0x8E);
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95
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96 // Set the correct values in the IDT pointer:
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97 idtP.base = (uint64_t)&idt;
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98 idtP.limit = (sizeof(IDT_entry) * 256) - 1;
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99 // call load IDT asm function:
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100 loadIDT();
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101
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102 PICremap();
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103 printf("enable ints\n");
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104 asm("sti");
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105 printf("Done!\n");
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106 }
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107
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108 // PIC functions:
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109 void PICremap() {
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110 unsigned char maskmaster, maskslave, pic1, pic2;
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111 pic1 = 0x20; // remapping location master
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112 pic2 = 0x28;
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113 maskmaster = inb(0x21); // master cmd=0x20, data=0x21
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114 maskslave = inb(0xA1); // slave command=0xA0, data=0xA1
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115
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116 outb(0x20, 0x20); // end of init
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117
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118 outb(0x20, 0x11); // init + ICW1_ICW2
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119 outb(0xA0, 0x11); // init + ICW1_ICW2
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120
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121 outb(0x21, pic1); // ICW2, write offset
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122 outb(0xA1, pic2); // ICW2
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123
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124 outb(0x21, 4); // ICW3, write a 4!
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125 outb(0xA1, 2); // ICW3, write a 2!
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126
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127 outb(0x21, 1); // ICW4, 8086 mode
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128 outb(0xA1, 1); // ICW4
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129
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130 outb(0x21, maskmaster);
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131 outb(0xA1, maskslave);
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132 }
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133
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134 // Interrupt service routines:
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135
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136 void INT0handler()
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137 {
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138 printf("INT0 called!\n");
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139 panic("Unhandled exception!");
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140 }
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141
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142 void INT1handler()
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143 {
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144 printf("INT1 called!\n");
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145 panic("Unhandled exception!");
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146 }
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147
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148 void INT2handler()
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149 {
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150 printf("INT2 called!\n");
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151 panic("Unhandled exception!");
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152 }
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153
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154 void INT3handler()
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155 {
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156 printf("INT3 called!\n");
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157 panic("Unhandled exception!");
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158 }
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159
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160 void INT4handler()
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161 {
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162 printf("INT4 called!\n");
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163 panic("Unhandled exception!");
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164 }
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165
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166 void INT5handler()
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167 {
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168 printf("INT5 called!\n");
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169 panic("Unhandled exception!");
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170 }
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171
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172 void INT6handler()
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173 {
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174 printf("INT6 called!\n");
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175 panic("Unhandled exception!");
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176 }
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177
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178 void INT7handler()
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179 {
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180 printf("INT7 called!\n");
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181 panic("Unhandled exception!");
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182 }
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183
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184 void INT8handler()
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185 {
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186 printf("INT8 called!\n");
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187 panic("Unhandled exception!");
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188 }
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189
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190 void INT9handler()
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191 {
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192 printf("INT9 called!\n");
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193 panic("Unhandled exception!");
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194 }
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195
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196 void INT10handler()
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197 {
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198 printf("INT10 called!\n");
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199 panic("Unhandled exception!");
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200 }
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201
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202 void INT11handler()
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203 {
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204 printf("INT11 called!\n");
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205 panic("Unhandled exception!");
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206 }
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207
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208 void INT12handler()
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209 {
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210 printf("INT12 called!\n");
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211 panic("Unhandled exception!");
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212 }
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213
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214 void INT13handler()
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215 {
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216 printf("INT13 called!\n");
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217 panic("Unhandled exception!");
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218 }
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219
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220 void* getUnusedPage()
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221 {
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222 return 0;
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223 }
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224
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225 void mappage(uint64_t address) {
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226 uint32_t pageDirIndex = address >> 22;
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227 uint32_t pageTableIndex = (address >> 12) & 0x3FF;
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228
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229 printf("Allocating page at %d, tableindex=%d\n", pageDirIndex, pageTableIndex);
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230 //uint32_t *pageTable = (uint32_t*)(pageDirectory[pageDirIndex] & 0xFFFFFC00);
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231 }
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232
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233 void INT14handler(unsigned int address)
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234 {
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235 printf("INT14 called! Page fault for address 0x%x!\n", address);
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236 if ( (address & 0xF0000000) == 0xD0000000 ) {
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237 mappage(address & 0xFFFFF000);
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238 return;
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239 }
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240
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241 panic("Unhandled exception!");
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242 }
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243
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244 void INT15handler()
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245 {
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246 printf("INT15 called!\n");
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247 panic("Unhandled exception!");
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248 }
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249
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250 void INT16handler()
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251 {
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252 printf("INT16 called!\n");
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253 panic("Unhandled exception!");
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254 }
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255
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256 void INT17handler()
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257 {
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258 printf("INT17 called!\n");
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259 panic("Unhandled exception!");
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260 }
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261
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262 void INT18handler()
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263 {
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264 printf("INT18 called!\n");
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265 panic("Unhandled exception!");
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266 }
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267
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268 void INT19handler()
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269 {
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270 printf("INT19 called!\n");
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271 panic("Unhandled exception!");
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272 }
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273
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274 // remapped IRQ from master PIC:
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275 void INT32handler()
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276 {
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277 // System timer.
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278 //printf("INT32 called!\n");
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279 // called very frequent, what is this?
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280 timerDriverUpdate();
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281 outb(0x20, 0x20); // EOI to master
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282 }
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283
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284 void INT33handler()
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285 {
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286 //printf("INT33 called, key pressed????\n");
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287 unsigned char scancode = inb(0x60);
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288 //printf("Scancode = 0x%x\n", scancode);
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289 keyboardDriverUpdate(scancode);
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290 outb(0x20, 0x20); // EOI to master
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291 }
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292
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293 void INT34handler()
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294 {
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295 printf("INT34 called!\n");
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296 }
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297
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298 void INTDEF_handler()
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299 {
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300 printf("Default int handler called\n");
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301 }
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302
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303
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