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// Low-level serial (and serial-like) device access.
//
// Copyright (C) 2008-1013 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "config.h" // CONFIG_DEBUG_SERIAL
#include "fw/paravirt.h" // RunningOnQEMU
#include "output.h" // dprintf
#include "serialio.h" // serial_debug_preinit
#include "x86.h" // outb
/****************************************************************
* Serial port debug output
****************************************************************/
#define DEBUG_TIMEOUT 100000
// Setup the debug serial port for output.
void
serial_debug_preinit(void)
{
if (!CONFIG_DEBUG_SERIAL)
return;
// setup for serial logging: 8N1
u8 oldparam, newparam = 0x03;
oldparam = inb(CONFIG_DEBUG_SERIAL_PORT+SEROFF_LCR);
outb(newparam, CONFIG_DEBUG_SERIAL_PORT+SEROFF_LCR);
// Disable irqs
u8 oldier, newier = 0;
oldier = inb(CONFIG_DEBUG_SERIAL_PORT+SEROFF_IER);
outb(newier, CONFIG_DEBUG_SERIAL_PORT+SEROFF_IER);
if (oldparam != newparam || oldier != newier)
dprintf(1, "Changing serial settings was %x/%x now %x/%x\n"
, oldparam, oldier, newparam, newier);
}
// Write a character to the serial port.
static void
serial_debug(char c)
{
if (!CONFIG_DEBUG_SERIAL)
return;
int timeout = DEBUG_TIMEOUT;
while ((inb(CONFIG_DEBUG_SERIAL_PORT+SEROFF_LSR) & 0x20) != 0x20)
if (!timeout--)
// Ran out of time.
return;
outb(c, CONFIG_DEBUG_SERIAL_PORT+SEROFF_DATA);
}
void
serial_debug_putc(char c)
{
if (c == '\n')
serial_debug('\r');
serial_debug(c);
}
// Make sure all serial port writes have been completely sent.
void
serial_debug_flush(void)
{
if (!CONFIG_DEBUG_SERIAL)
return;
int timeout = DEBUG_TIMEOUT;
while ((inb(CONFIG_DEBUG_SERIAL_PORT+SEROFF_LSR) & 0x60) != 0x60)
if (!timeout--)
// Ran out of time.
return;
}
/****************************************************************
* QEMU debug port
****************************************************************/
u16 DebugOutputPort VARFSEG = 0x402;
// Write a character to the special debugging port.
void
qemu_debug_putc(char c)
{
if (CONFIG_DEBUG_IO && runningOnQEMU())
// Send character to debug port.
outb(c, GET_GLOBAL(DebugOutputPort));
}
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