void move_cursor() {
u16 cursor_location = monitor->cursor_y * 80 + monitor->cursor_x;
x86_outb(0x3D4, 14);
x86_outb(0x3D5, cursor_location >> 8);
x86_outb(0x3D4, 15);
x86_outb(0x3D5, cursor_location);
}
PUBLIC void serial_init(void)
{
x86_outb(SERIAL_PORT + 1, 0x00); /* No interrupt */
x86_outb(SERIAL_PORT + 3, 0x80); /* DLAB (divisor) */
x86_outb(SERIAL_PORT + 0, 0x03); /* Divisor (3 == 38400 bauds) - MSB */
x86_outb(SERIAL_PORT + 1, 0x00); /* Divisor - LSB */
x86_outb(SERIAL_PORT + 3, 0x03); /* 8 bits, no parity, 1 stop bit */
return;
}
PUBLIC u8_t pit_setup(void)
{
u32_t ticks;
/* Compute number of clock pulsations before triggering interrupt */
ticks = PIT_MAX_FREQ/PIT_FREQ;
/* counter are 16 bits values
max value is 2^16=65535 and 65536 is in fact 0 */
if (ticks <= 65536)
{
/* 65536 == 0 */
ticks = (ticks==65536?0:ticks);
/* Send control word to active Mode 2 (Rate Generator) */
x86_outb(PIT_CWREG,PIT_MODE2);
/* Send frequency for this mode */
x86_outb(PIT_COUNTER0,(u8_t)ticks); /* LSB first */
x86_outb(PIT_COUNTER0,(u8_t)(ticks>>8)); /* MSB last */
}
PUBLIC void serial_putc(char c)
{
u32_t i;
u8_t buf;
/* Wait for line release */
for(i=0;i<12345;i++)
{
x86_inb(SERIAL_PORT+5,&buf);
if (buf & 0x20)
{
break;
}
}
/* Put character */
x86_outb(SERIAL_PORT,c);
return;
}
