crateOS/kernel.c at main · silas-wr/crateOS · GitHub

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#define VGA_ADDRESS 0xB8000 /* video memory begins here.*/

#ifndef KEYBOARD_H
#define KEYBOARD_H

#define KEYBOARD_PORT 0x60


#define KEY_A 0x1E
#define KEY_B 0x30
#define KEY_C 0x2E
#define KEY_D 0x20
#define KEY_E 0x12
#define KEY_F 0x21
#define KEY_G 0x22
#define KEY_H 0x23
#define KEY_I 0x17
#define KEY_J 0x24
#define KEY_K 0x25
#define KEY_L 0x26
#define KEY_M 0x32
#define KEY_N 0x31
#define KEY_O 0x18
#define KEY_P 0x19
#define KEY_Q 0x10
#define KEY_R 0x13
#define KEY_S 0x1F
#define KEY_T 0x14
#define KEY_U 0x16
#define KEY_V 0x2F
#define KEY_W 0x11
#define KEY_X 0x2D
#define KEY_Y 0x15
#define KEY_Z 0x2C
#define KEY_1 0x02
#define KEY_2 0x03
#define KEY_3 0x04
#define KEY_4 0x05
#define KEY_5 0x06
#define KEY_6 0x07
#define KEY_7 0x08
#define KEY_8 0x09
#define KEY_9 0x0A
#define KEY_0 0x0B
#define KEY_MINUS 0x0C
#define KEY_EQUAL 0x0D
#define KEY_SQUARE_OPEN_BRACKET 0x1A
#define KEY_SQUARE_CLOSE_BRACKET 0x1B
#define KEY_SEMICOLON 0x27
#define KEY_BACKSLASH 0x2B
#define KEY_COMMA 0x33
#define KEY_DOT 0x34
#define KEY_FORESLHASH 0x35
#define KEY_F1 0x3B
#define KEY_F2 0x3C
#define KEY_F3 0x3D
#define KEY_F4 0x3E
#define KEY_F5 0x3F
#define KEY_F6 0x40
#define KEY_F7 0x41
#define KEY_F8 0x42
#define KEY_F9 0x43
#define KEY_F10 0x44
#define KEY_F11 0x85
#define KEY_F12 0x86
#define KEY_BACKSPACE 0x0E
#define KEY_DELETE 0x53
#define KEY_DOWN 0x50
#define KEY_END 0x4F
#define KEY_ENTER 0x1C
#define KEY_ESC 0x01
#define KEY_HOME 0x47
#define KEY_INSERT 0x52
#define KEY_KEYPAD_5 0x4C
#define KEY_KEYPAD_MUL 0x37
#define KEY_KEYPAD_Minus 0x4A
#define KEY_KEYPAD_PLUS 0x4E
#define KEY_KEYPAD_DIV 0x35
#define KEY_LEFT 0x4B
#define KEY_PAGE_DOWN 0x51
#define KEY_PAGE_UP 0x49
#define KEY_PRINT_SCREEN 0x37
#define KEY_RIGHT 0x4D
#define KEY_SPACE 0x39
#define KEY_TAB 0x0F
#define KEY_UP 0x48


#endif

/* VGA: 16 colors */
enum vga_color {
    BLACK,
    BLUE,
    GREEN,
    CYAN,
    RED,
    MAGENTA,
    BROWN,
    GREY,
    DARK_GREY,
    BRIGHT_BLUE,
    BRIGHT_GREEN,
    BRIGHT_CYAN,
    BRIGHT_RED,
    BRIGHT_MAGENTA,
    YELLOW,
    WHITE,
};

unsigned short *terminal_buffer;
unsigned int vga_index;

void clear_screen(void)
{
	int index = 0;
	/* there are 25 lines each of 80 columns;
	   each element takes 2 bytes */
	while (index < 80 * 25 * 2) {
		terminal_buffer[index] = ' ';
		index += 2;
	}
}

void print_string(char *str, unsigned char color, int new)
{
	int index = 0;
	while (str[index]) {
		terminal_buffer[vga_index] = (unsigned short)str[index]|\
					     (unsigned short)color << 8;
		index++;
		vga_index++;
	}

	if (new) {
		newline();
	}
}

void newline(void)
{
	vga_index += 80-(vga_index%80);
}

void main(void)
{
	terminal_buffer = (unsigned short *)VGA_ADDRESS;
	vga_index = 0;

	clear_screen();
	print_string("Welcome to the ", WHITE, 0);
	print_string("CrateOS ", CYAN, 0);
	print_string("kernel!", WHITE, 1);
	newline();

	// Color test
	//print_string("||", BLACK, 0); // does nothing
	print_string("||", BLUE, 0);
	print_string("||", GREEN, 0);
	print_string("||", CYAN, 0);
	print_string("||", RED, 0);
	print_string("||", MAGENTA, 0);
	print_string("||", BROWN, 0);
	print_string("||", GREY, 0);
	print_string("||", DARK_GREY, 0);
	print_string("||", BRIGHT_BLUE, 0);
	print_string("||", BRIGHT_GREEN, 0);
	print_string("||", BRIGHT_CYAN, 0);
	print_string("||", BRIGHT_RED, 0);
	print_string("||", BRIGHT_MAGENTA, 0);
	print_string("||", YELLOW, 0);
	print_string("||", WHITE, 1);
	newline();

	return;
}