int tty_getcursor() {
port_byte_out(REG_SCREEN_CTRL, 14);
int offset = port_byte_in(REG_SCREEN_DATA) << 8;
port_byte_out(REG_SCREEN_CTRL, 15);
offset += port_byte_in(REG_SCREEN_DATA);
return offset;
}
int get_cursor_offset() {
/* Use the VGA ports to get the current cursor position
* 1. Ask for high byte of the cursor offset (data 14)
* 2. Ask for low byte (data 15)
*/
port_byte_out(REG_SCREEN_CTRL, 14);
int offset = port_byte_in(REG_SCREEN_DATA) << 8; /* High byte: << 8 */
port_byte_out(REG_SCREEN_CTRL, 15);
offset += port_byte_in(REG_SCREEN_DATA);
return offset * 2; /* Position * size of character cell */
}
static struct cursor get_cursor(void)
{
port_byte_out(CTRL_PORT, 14);
uint8_t high_byte = port_byte_in(DATA_PORT);
port_byte_out(CTRL_PORT, 15);
uint8_t low_byte = port_byte_in(DATA_PORT);
uint16_t offset = high_byte;
offset <<= 8;
offset += low_byte;
struct cursor cur = {(uint16_t)(offset / MAX_COLS),
(uint16_t)(offset % MAX_COLS)};
return cur;
}
int get_cursor()
{
// The device uses its control register as an index
// to select its interl registers, in which we are
// interested in
// reg 14: which is the high byte of cursor offset
// reg 15: which is the low byte of cursor offet
port_byte_out(REG_SCREEN_CTRL, 14);
int nOffset = port_byte_in(REG_SCREEN_DATA) << 8;
port_byte_out(REG_SCREEN_CTRL, 15);
nOffset += port_byte_in(REG_SCREEN_DATA);
// Since the cursor offset reported by the VGA hardware
// is the number of characters, we have to multiply it
// by two to convert it to a character cell offset
return nOffset * 2;
}
void echoKey() {
unsigned char keymap[128] =
{
0, 27, '1', '2', '3', '4', '5', '6', '7', '8', /* 9 */
'9', '0', '-', '=', '\b', /* Backspace */
'\t', /* Tab */
'q', 'w', 'e', 'r', /* 19 */
't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n', /* Enter key */
0, /* 29 - Control */
'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', /* 39 */
'\'', '`', 0, /* Left shift */
'\\', 'z', 'x', 'c', 'v', 'b', 'n', /* 49 */
'm', ',', '.', '/', 0, /* Right shift */
'*',
0, /* Alt */
' ', /* Space bar */
0, /* Caps lock */
0, /* 59 - F1 key ... > */
0, 0, 0, 0, 0, 0, 0, 0,
0, /* < ... F10 */
0, /* 69 - Num lock*/
0, /* Scroll Lock */
0, /* Home key */
0, /* Up Arrow */
0, /* Page Up */
'-',
0, /* Left Arrow */
0,
0, /* Right Arrow */
'+',
0, /* 79 - End key*/
0, /* Down Arrow */
0, /* Page Down */
0, /* Insert Key */
0, /* Delete Key */
0, 0, 0,
0, /* F11 Key */
0, /* F12 Key */
0, /* All other keys are undefined */};
unsigned char scanCode = port_byte_in(0x60);
if(!(scanCode & KEY_RELEASED)) {
printChar(keymap[scanCode]);
}
}
static void keyboard_callback() {
unsigned char code = port_byte_in(0x60);
ash_receive_key(code);
}
