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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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4 static volatile unsigned char charAvail = 0;
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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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31 static uint64_t ticks = 0;
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32 void timerDriverUpdate()
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33 {
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34 ticks++;
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35 }
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36
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37 uint64_t getTimeMS()
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38 {
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39 return 55*ticks;
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40 }
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41
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42 int strncmp(const char* s1, const char* s2, int size) {
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43 int i;
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44 for (i=0; i<size; i++) {
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45 if (s1[i] != s2[i]) return 0;
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46 }
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47 return 1;
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48 }
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49
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50 void keyboardDriverUpdate(unsigned char scancode)
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51 {
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52 switch(scancode) {
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53 case 0x2a:
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54 shiftstate = 1;
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55 break;
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56 case 0xaa:
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57 shiftstate = 0;
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58 break;
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59 default:
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60 if (scancode < 128) {
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61 if (charAvail == 0) {
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62 if (shiftstate == 0) {
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63 kbdchar = keymap[scancode];
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64 } else {
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65 kbdchar = keymapUPPER[scancode];
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66 }
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67
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68 charAvail = 1;
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69 }
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70 } else {
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71 // Key release
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72 //printf("Unhandled scancode: 0x%x\n", scancode);
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73 }
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74 break;
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75 }
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76 }
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77
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78 char getChar() {
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79 while (charAvail == 0);
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80 char c = kbdchar;
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81 charAvail = 0;
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82 return c;
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83 }
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84
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85 void getline(char *buffer, int len) {
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86 char c;
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87 int i = 0;
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88 while (i < len-1) {
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89 c = getChar();
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90 if (c == '\n') {
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91 // Enter
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92 break;
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93 }
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94 if (c == 0x0e) {
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95 if (i>0) {
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96 printf(" ");
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97 i--;
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98 }
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99 continue;
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100 }
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101 buffer[i] = c;
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102 printf("%c", c);
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103 i++;
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104 }
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105 buffer[i] = 0;
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106 }
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107
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108 /*
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109 malloc and free divide the chunks of memory present at the heap
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110 of the kernel into smaller parts.
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111 The heap is located at: 0x
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112 */
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113 static void* kernel_heap = (void*) 0xD0000000;
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114 /* Allocates 'size' bytes and returns the pointer if succesfull.
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115 Kernelpanic in case of failure..
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116 */
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117 void* malloc(size_t size) {
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118 printf("Malloc %d bytes\n", size);
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119 return kernel_heap;
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120 }
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121
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122 void free(void* ptr) {
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123 printf("Free address %x\n", ptr);
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124 }
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125
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126 void kmain()
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127 {
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128 init_screen();
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129 clear_screen();
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130 printf("Welcome!\n");
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131 printf("sizeof(uint32_t)=%u, sizeof(uint64_t)=%u\n", sizeof(uint32_t), sizeof(uint64_t));
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132 printf("Entering mainloop!\n");
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133
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134 while (1==1)
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135 {
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136 char buffer[70];
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137 printf(">>>");
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138 getline(buffer, 70);
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139 // TODO: interpret this line with python :)
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140 printf("\n");
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141 printf("Got line: '%s'\n", buffer);
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142 if (buffer[0] == 'x')
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143 {
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144 printf("System time in ms: %d\n", getTimeMS());
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145 }
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146 if ( strncmp(buffer, "help", 4))
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147 {
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148 printf("Help\n Try one of these commands:\n");
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149 printf(" x: print system time in ms\n");
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150 }
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151 }
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152 }
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153
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154
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