/*
* Read 1 character from keyboard's data port.
*
* If there are no characters available in keyboard buffer, the function
* will block until interrupt arrives (possible race condition...).
*/
u8_t __read_raw_kbd_char(void)
{
u8_t c;
while (1) {
// Fetch a single character from keyboard
c = *kbd_mmio_address;
// No data available? Idle until there are some chars to read.
if (c == 0xFF) {
__idle();
continue;
}
return c;
}
}
char bios_getchar(char *hi)
{
com32sys_t ireg, oreg;
unsigned char data;
memset(&ireg, 0, sizeof(ireg));
memset(&oreg, 0, sizeof(oreg));
while (1) {
__idle();
ireg.eax.b[1] = 0x11; /* Poll keyboard */
__intcall(0x16, &ireg, &oreg);
if (oreg.eflags.l & EFLAGS_ZF) {
if (!SerialPort)
continue;
cli();
if (SerialTail != SerialHead) {
/* serial queued */
sti(); /* We already know we'll consume data */
data = *SerialTail++;
if (SerialTail > SerialHead + serial_buf_size)
SerialTail = SerialHead;
} else {
/* LSR */
data = inb(SerialPort + 5) & 1;
if (!data) {
sti();
continue;
}
data = inb(SerialPort + 6);
data &= FlowIgnore;
if (data != FlowIgnore) {
sti();
continue;
}
data = inb(SerialPort);
sti();
break;
}
} else {
/* Keyboard input? */
ireg.eax.b[1] = 0x10; /* Get keyboard input */
__intcall(0x16, &ireg, &oreg);
data = oreg.eax.b[0];
*hi = oreg.eax.b[1];
if (data == 0xE0)
data = 0;
if (data) {
/* Convert character sets */
data = KbdMap[data];
}
}
break;
}
reset_idle(); /* Character received */
return data;
}
