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comparison cos/kernel/kernel.c @ 9:92ace1ca50a8

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64 bits kernel without interrupts but with printf in C
author windel
date Sun, 13 Nov 2011 12:47:47 +0100
parents
children a58904747019
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8:edd70006d3e4 9:92ace1ca50a8
1 #include "kernel.h"
2
3 static int shiftstate = 0;
4 static volatile unsigned char charAvail = 0;
5 static volatile char kbdchar = ' ';
6
7 static char keymap[128] = {
8 '?','?','1','2', '3', '4', '5','6', '7', '8','9', '0', '-','=', 0xe, '?',
9 'q','w','e','r', 't', 'y', 'u','i', 'o', 'p','[', ']', '\n','?', 'a', 's',
10 'd','f','g','h', 'j', 'k', 'l',';', '\'', '?','?', '?', 'z','x', 'c', 'v',
11 'b','n','m',',', '.', '/', '?','?', '?', ' ','?', '?', '?','?', '?', '?',
12
13 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
14 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
15 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
16 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?'
17 };
18
19 static char keymapUPPER[128] = {
20 '?','?','!','@', '#', '$', '%','^', '&', '*','(', ')', '_','+', '?', '?',
21 'Q','W','E','R', 'T', 'Y', 'U','I', 'O', 'P','{', '}', '|','?', 'A', 'S',
22 'D','F','G','H', 'J', 'K', 'L',':', '"', '?','?', '?', 'Z','X', 'C', 'V',
23 'B','N','M','<', '>', '?', '?','?', '?', ' ','?', '?', '?','?', '?', '?',
24
25 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
26 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
27 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?',
28 '?','?','?','?', '?', '?', '?','?', '?', '?','?', '?', '?','?', '?', '?'
29 };
30
31 static uint64_t ticks = 0;
32 void timerDriverUpdate()
33 {
34 ticks++;
35 }
36
37 uint64_t getTimeMS()
38 {
39 return 55*ticks;
40 }
41
42 int strncmp(const char* s1, const char* s2, int size) {
43 int i;
44 for (i=0; i<size; i++) {
45 if (s1[i] != s2[i]) return 0;
46 }
47 return 1;
48 }
49
50 void keyboardDriverUpdate(unsigned char scancode)
51 {
52 switch(scancode) {
53 case 0x2a:
54 shiftstate = 1;
55 break;
56 case 0xaa:
57 shiftstate = 0;
58 break;
59 default:
60 if (scancode < 128) {
61 if (charAvail == 0) {
62 if (shiftstate == 0) {
63 kbdchar = keymap[scancode];
64 } else {
65 kbdchar = keymapUPPER[scancode];
66 }
67
68 charAvail = 1;
69 }
70 } else {
71 // Key release
72 //printf("Unhandled scancode: 0x%x\n", scancode);
73 }
74 break;
75 }
76 }
77
78 char getChar() {
79 while (charAvail == 0);
80 char c = kbdchar;
81 charAvail = 0;
82 return c;
83 }
84
85 void getline(char *buffer, int len) {
86 char c;
87 int i = 0;
88 while (i < len-1) {
89 c = getChar();
90 if (c == '\n') {
91 // Enter
92 break;
93 }
94 if (c == 0x0e) {
95 if (i>0) {
96 printf(" ");
97 i--;
98 }
99 continue;
100 }
101 buffer[i] = c;
102 printf("%c", c);
103 i++;
104 }
105 buffer[i] = 0;
106 }
107
108 /*
109 malloc and free divide the chunks of memory present at the heap
110 of the kernel into smaller parts.
111 The heap is located at: 0x
112 */
113 static void* kernel_heap = (void*) 0xD0000000;
114 /* Allocates 'size' bytes and returns the pointer if succesfull.
115 Kernelpanic in case of failure..
116 */
117 void* malloc(size_t size) {
118 printf("Malloc %d bytes\n", size);
119 return kernel_heap;
120 }
121
122 void free(void* ptr) {
123 printf("Free address %x\n", ptr);
124 }
125
126 void kmain()
127 {
128 init_screen();
129 clear_screen();
130 printf("Welcome!\n");
131 printf("sizeof(uint32_t)=%u, sizeof(uint64_t)=%u\n", sizeof(uint32_t), sizeof(uint64_t));
132 printf("Entering mainloop!\n");
133
134 while (1==1)
135 {
136 char buffer[70];
137 printf(">>>");
138 getline(buffer, 70);
139 // TODO: interpret this line with python :)
140 printf("\n");
141 printf("Got line: '%s'\n", buffer);
142 if (buffer[0] == 'x')
143 {
144 printf("System time in ms: %d\n", getTimeMS());
145 }
146 if ( strncmp(buffer, "help", 4))
147 {
148 printf("Help\n Try one of these commands:\n");
149 printf(" x: print system time in ms\n");
150 }
151 }
152 }
153
154