void hw_reset_platform(void)
{
UINT8 reset_control_register;
// Write the ICH register required to perform a platform reset (Cold Reset)
reset_control_register = hw_read_port_8(RESET_CONTROL_REGISTER_IO_PORT);
SET_CPU_RESET( reset_control_register );
SET_SYSTEM_RESET( reset_control_register );
hw_write_port_8 (RESET_CONTROL_REGISTER_IO_PORT, reset_control_register);
// Never returns
VMM_DEADLOOP ();
}
/*
* Checks h/w handshake lines for "go" status. Count the number of times it
* was "stop". In UART_HANDSHAKE_AUTO mode, after a limit is reached force
* the status to "go".
*/
static boolean_t is_hw_tx_handshake_go(mon_serial_device_t *p_device)
{
/* Modem Status Register image */
uart_msr_t msr;
/* flags transmit "go" by h/w handshake */
boolean_t hw_handshake_go;
if ((p_device->handshake_mode == UART_HANDSHAKE_AUTO) ||
(p_device->handshake_mode == UART_HANDSHAKE_HW)) {
/* Read the h/w handshake signals */
msr.data =
hw_read_port_8(p_device->io_base + UART_REGISTER_MSR);
hw_handshake_go = (msr.bits.cts == 1) && (msr.bits.dsr == 1);
if (hw_handshake_go) {
/* Other side set h/w handshake to "go". Reset the counter. */
update_avg(&p_device->hw_handshake_stopped_count_avg,
p_device->hw_handshake_stopped_count);
p_device->hw_handshake_stopped_count = 0;
} else if (p_device->hw_handshake_stopped_count >=
hw_handshake_stopped_limit) {
/* Other side has indicated h/w handshake "stop" for too long. */
if (p_device->handshake_mode == UART_HANDSHAKE_AUTO) {
/* In auto mode, assume the h/w handshake is stuck and force */
/* the status to "go" */
hw_handshake_go = TRUE;
p_device->num_chars_hw_handshake_auto_go++;
if (p_device->hw_handshake_stopped_count ==
hw_handshake_stopped_limit) {
/* Update the statistic only on the first character */
/* we decided to auto-go */
update_avg(
&p_device->hw_handshake_stopped_count_avg,
p_device->hw_handshake_stopped_count);
p_device->hw_handshake_stopped_count++;
}
}
} else {
/* Increment the stop count and update the statistics */
if (p_device->hw_handshake_stopped_count == 0) {
/* We just stopped, increment the stops statistics counter */
p_device->num_chars_hw_handshake_stopped++;
}
p_device->hw_handshake_stopped_count++;
update_max(&p_device->hw_handshake_stopped_count_max,
p_device->hw_handshake_stopped_count);
}
} else {
/* No h/w handshake, always "go" */
hw_handshake_go = TRUE;
}
return hw_handshake_go;
}
