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seabios/src/serial.c

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// 16bit code to handle serial and printer services.
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2002 MandrakeSoft S.A.
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "biosvar.h" // SET_BDA
#include "util.h" // debug_enter
#include "bregs.h" // struct bregs
/****************************************************************
* COM ports
****************************************************************/
static u16
detect_serial(u16 port, u8 timeout, u8 count)
{
outb(0x02, port+1);
if (inb(port+1) != 0x02)
return 0;
if (inb(port+2) != 0x02)
return 0;
outb(0x00, port+1);
SET_BDA(port_com[count], port);
SET_BDA(com_timeout[count], timeout);
return 1;
}
void
serial_setup()
{
if (! CONFIG_SERIAL)
return;
dprintf(3, "init serial\n");
u16 count = 0;
count += detect_serial(0x3f8, 0x0a, count);
count += detect_serial(0x2f8, 0x0a, count);
count += detect_serial(0x3e8, 0x0a, count);
count += detect_serial(0x2e8, 0x0a, count);
// Equipment word bits 9..11 determing # serial ports
u16 eqb = GET_BDA(equipment_list_flags);
SET_BDA(equipment_list_flags, (eqb & 0xf1ff) | (count << 9));
}
static u16
getComAddr(struct bregs *regs)
{
if (regs->dx >= 4) {
set_fail(regs);
return 0;
}
u16 addr = GET_BDA(port_com[regs->dx]);
if (! addr)
set_fail(regs);
return addr;
}
// SERIAL - INITIALIZE PORT
static void
handle_1400(struct bregs *regs)
{
u16 addr = getComAddr(regs);
if (!addr)
return;
outb(inb(addr+3) | 0x80, addr+3);
if ((regs->al & 0xE0) == 0) {
outb(0x17, addr);
outb(0x04, addr+1);
} else {
u16 val16 = 0x600 >> ((regs->al & 0xE0) >> 5);
outb(val16 & 0xFF, addr);
outb(val16 >> 8, addr+1);
}
outb(regs->al & 0x1F, addr+3);
regs->ah = inb(addr+5);
regs->al = inb(addr+6);
set_success(regs);
}
// SERIAL - WRITE CHARACTER TO PORT
static void
handle_1401(struct bregs *regs)
{
u16 addr = getComAddr(regs);
if (!addr)
return;
u16 timer = GET_BDA(timer_counter);
u16 timeout = GET_BDA(com_timeout[regs->dx]);
while (((inb(addr+5) & 0x60) != 0x60) && (timeout)) {
u16 val16 = GET_BDA(timer_counter);
if (val16 != timer) {
timer = val16;
timeout--;
}
}
if (timeout)
outb(regs->al, addr);
regs->ah = inb(addr+5);
if (!timeout)
regs->ah |= 0x80;
set_success(regs);
}
// SERIAL - READ CHARACTER FROM PORT
static void
handle_1402(struct bregs *regs)
{
u16 addr = getComAddr(regs);
if (!addr)
return;
u16 timer = GET_BDA(timer_counter);
u16 timeout = GET_BDA(com_timeout[regs->dx]);
while (((inb(addr+5) & 0x01) == 0) && (timeout)) {
u16 val16 = GET_BDA(timer_counter);
if (val16 != timer) {
timer = val16;
timeout--;
}
}
if (timeout) {
regs->ah = 0;
regs->al = inb(addr);
} else {
regs->ah = inb(addr+5);
}
set_success(regs);
}
// SERIAL - GET PORT STATUS
static void
handle_1403(struct bregs *regs)
{
u16 addr = getComAddr(regs);
if (!addr)
return;
regs->ah = inb(addr+5);
regs->al = inb(addr+6);
set_success(regs);
}
static void
handle_14XX(struct bregs *regs)
{
// Unsupported
set_fail(regs);
}
// INT 14h Serial Communications Service Entry Point
void VISIBLE16
handle_14(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_14);
if (! CONFIG_SERIAL) {
handle_14XX(regs);
return;
}
irq_enable();
switch (regs->ah) {
case 0x00: handle_1400(regs); break;
case 0x01: handle_1401(regs); break;
case 0x02: handle_1402(regs); break;
case 0x03: handle_1403(regs); break;
default: handle_14XX(regs); break;
}
}
/****************************************************************
* LPT ports
****************************************************************/
static u16
detect_parport(u16 port, u8 timeout, u8 count)
{
// clear input mode
outb(inb(port+2) & 0xdf, port+2);
outb(0xaa, port);
if (inb(port) != 0xaa)
// Not present
return 0;
SET_BDA(port_lpt[count], port);
SET_BDA(lpt_timeout[count], timeout);
return 1;
}
void
lpt_setup()
{
if (! CONFIG_LPT)
return;
dprintf(3, "init lpt\n");
u16 count = 0;
count += detect_parport(0x378, 0x14, count);
count += detect_parport(0x278, 0x14, count);
// Equipment word bits 14..15 determing # parallel ports
u16 eqb = GET_BDA(equipment_list_flags);
SET_BDA(equipment_list_flags, (eqb & 0x3fff) | (count << 14));
}
static u16
getLptAddr(struct bregs *regs)
{
if (regs->dx >= 3) {
set_fail(regs);
return 0;
}
u16 addr = GET_BDA(port_lpt[regs->dx]);
if (! addr)
set_fail(regs);
return addr;
}
static void
lpt_ret(struct bregs *regs, u16 addr, u16 timeout)
{
u8 val8 = inb(addr+1);
regs->ah = (val8 ^ 0x48);
if (!timeout)
regs->ah |= 0x01;
set_success(regs);
}
// INT 17 - PRINTER - WRITE CHARACTER
static void
handle_1700(struct bregs *regs)
{
u16 addr = getLptAddr(regs);
if (!addr)
return;
u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
outb(regs->al, addr);
u8 val8 = inb(addr+2);
outb(val8 | 0x01, addr+2); // send strobe
nop();
outb(val8 & ~0x01, addr+2);
while (((inb(addr+1) & 0x40) == 0x40) && (timeout))
timeout--;
lpt_ret(regs, addr, timeout);
}
// INT 17 - PRINTER - INITIALIZE PORT
static void
handle_1701(struct bregs *regs)
{
u16 addr = getLptAddr(regs);
if (!addr)
return;
u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
u8 val8 = inb(addr+2);
outb(val8 & ~0x04, addr+2); // send init
nop();
outb(val8 | 0x04, addr+2);
lpt_ret(regs, addr, timeout);
}
// INT 17 - PRINTER - GET STATUS
static void
handle_1702(struct bregs *regs)
{
u16 addr = getLptAddr(regs);
if (!addr)
return;
u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
lpt_ret(regs, addr, timeout);
}
static void
handle_17XX(struct bregs *regs)
{
// Unsupported
set_fail(regs);
}
// INT17h : Printer Service Entry Point
void VISIBLE16
handle_17(struct bregs *regs)
{
debug_enter(regs, DEBUG_HDL_17);
if (! CONFIG_LPT) {
handle_17XX(regs);
return;
}
irq_enable();
switch (regs->ah) {
case 0x00: handle_1700(regs); break;
case 0x01: handle_1701(regs); break;
case 0x02: handle_1702(regs); break;
default: handle_17XX(regs); break;
}
}
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