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9
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1 #include "kernel.h"
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2
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3 static int shiftstate = 0;
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17
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4 static volatile uint8_t charAvail = 0;
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9
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5 static volatile char kbdchar = ' ';
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6
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7 static char keymap[128] = {
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8 '?','?','1','2', '3', '4', '5','6', '7', '8','9', '0', '-','=', 0xe, '?',
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9 'q','w','e','r', 't', 'y', 'u','i', 'o', 'p','[', ']', '\n','?', 'a', 's',
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10 'd','f','g','h', 'j', 'k', 'l',';', '\'', '?','?', '?', 'z','x', 'c', 'v',
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11 'b','n','m',',', '.', '/', '?','?', '?', ' ','?', '?', '?','?', '?', '?',
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12
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13 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
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14 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
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15 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
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16 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?'
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17 };
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18
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19 static char keymapUPPER[128] = {
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20 '?','?','!','@', '#', '$', '%','^', '&', '*','(', ')', '_','+', '?', '?',
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21 'Q','W','E','R', 'T', 'Y', 'U','I', 'O', 'P','{', '}', '|','?', 'A', 'S',
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22 'D','F','G','H', 'J', 'K', 'L',':', '"', '?','?', '?', 'Z','X', 'C', 'V',
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23 'B','N','M','<', '>', '?', '?','?', '?', ' ','?', '?', '?','?', '?', '?',
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24
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25 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
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26 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
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27 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
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28 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?'
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29 };
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30
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17
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31 // IO port helpers:
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32 void outb(uint16_t port, uint8_t value)
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33 {
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34 asm volatile ("outb %1, %0" : : "dN" (port), "a" (value));
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35 }
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36
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37 uint8_t inb(uint16_t port)
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38 {
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39 uint8_t ret;
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40 asm volatile ("inb %1, %0" : "=a" (ret) : "dN" (port));
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41 return ret;
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42 }
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43
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44 uint16_t inw(uint16_t port)
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45 {
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46 uint16_t ret;
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47 asm volatile ("inw %1, %0" : "=a" (ret) : "dN" (port));
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48 return ret;
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49 }
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50
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51
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9
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52 static uint64_t ticks = 0;
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53 void timerDriverUpdate()
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54 {
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55 ticks++;
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56 }
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57
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58 uint64_t getTimeMS()
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59 {
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60 return 55*ticks;
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61 }
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62
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63 int strncmp(const char* s1, const char* s2, int size) {
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64 int i;
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65 for (i=0; i<size; i++) {
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66 if (s1[i] != s2[i]) return 0;
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67 }
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68 return 1;
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69 }
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70
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71 void keyboardDriverUpdate(unsigned char scancode)
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72 {
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73 switch(scancode) {
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74 case 0x2a:
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75 shiftstate = 1;
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76 break;
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77 case 0xaa:
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78 shiftstate = 0;
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79 break;
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80 default:
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81 if (scancode < 128) {
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82 if (charAvail == 0) {
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83 if (shiftstate == 0) {
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84 kbdchar = keymap[scancode];
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85 } else {
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86 kbdchar = keymapUPPER[scancode];
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87 }
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88
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89 charAvail = 1;
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90 }
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91 } else {
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92 // Key release
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93 //printf("Unhandled scancode: 0x%x\n", scancode);
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94 }
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95 break;
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96 }
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97 }
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98
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99 char getChar() {
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100 while (charAvail == 0);
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101 char c = kbdchar;
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102 charAvail = 0;
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103 return c;
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104 }
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105
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106 void getline(char *buffer, int len) {
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107 char c;
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108 int i = 0;
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109 while (i < len-1) {
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110 c = getChar();
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111 if (c == '\n') {
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112 // Enter
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113 break;
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114 }
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115 if (c == 0x0e) {
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116 if (i>0) {
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117 printf(" ");
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118 i--;
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119 }
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120 continue;
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121 }
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122 buffer[i] = c;
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123 printf("%c", c);
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124 i++;
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125 }
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126 buffer[i] = 0;
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127 }
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128
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129 /*
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130 malloc and free divide the chunks of memory present at the heap
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131 of the kernel into smaller parts.
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132 The heap is located at: 0x
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133 */
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134 static void* kernel_heap = (void*) 0xD0000000;
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135 /* Allocates 'size' bytes and returns the pointer if succesfull.
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136 Kernelpanic in case of failure..
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137 */
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17
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138 void* malloc(uint64_t size) {
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9
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139 printf("Malloc %d bytes\n", size);
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140 return kernel_heap;
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141 }
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142
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143 void free(void* ptr) {
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144 printf("Free address %x\n", ptr);
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145 }
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146
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147 void kmain()
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148 {
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149 init_screen();
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17
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150 printf("Welcome! .. ");
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14
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151
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17
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152 printf("Enabling interrupts .. ");
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14
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153 setupIDT();
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9
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154 printf("Entering mainloop!\n");
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155
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156 while (1==1)
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157 {
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158 char buffer[70];
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159 printf(">>>");
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160 getline(buffer, 70);
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161 // TODO: interpret this line with python :)
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162 printf("\n");
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163 printf("Got line: '%s'\n", buffer);
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164 if (buffer[0] == 'x')
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165 {
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166 printf("System time in ms: %d\n", getTimeMS());
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167 }
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168 if ( strncmp(buffer, "help", 4))
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169 {
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170 printf("Help\n Try one of these commands:\n");
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171 printf(" x: print system time in ms\n");
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172 }
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173 }
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174 }
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175
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176
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