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// 16bit code to handle serial and printer services.
//
// Copyright (C) 2008,2009 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 "bregs.h" // struct bregs
#include "hw/serialio.h" // SEROFF_IER
#include "output.h" // debug_enter
#include "stacks.h" // yield
#include "util.h" // serial_setup
/****************************************************************
* COM ports
****************************************************************/
static u16
detect_serial(u16 port, u8 timeout, u8 count)
{
outb(0x02, port+SEROFF_IER);
u8 ier = inb(port+SEROFF_IER);
if (ier != 0x02)
return 0;
u8 iir = inb(port+SEROFF_IIR);
if ((iir & 0x3f) != 0x02)
return 0;
outb(0x00, port+SEROFF_IER);
SET_BDA(port_com[count], port);
SET_BDA(com_timeout[count], timeout);
return 1;
}
void
serial_setup(void)
{
if (! CONFIG_SERIAL)
return;
dprintf(3, "init serial\n");
u16 count = 0;
count += detect_serial(PORT_SERIAL1, 0x0a, count);
count += detect_serial(PORT_SERIAL2, 0x0a, count);
count += detect_serial(PORT_SERIAL3, 0x0a, count);
count += detect_serial(PORT_SERIAL4, 0x0a, count);
dprintf(1, "Found %d serial ports\n", count);
// Equipment word bits 9..11 determing # serial ports
set_equipment_flags(0xe00, count << 9);
}
static u16
getComAddr(struct bregs *regs)
{
if (regs->dx >= 4) {
set_invalid(regs);
return 0;
}
u16 addr = GET_BDA(port_com[regs->dx]);
if (! addr)
set_invalid(regs);
return addr;
}
// SERIAL - INITIALIZE PORT
static void
handle_1400(struct bregs *regs)
{
u16 addr = getComAddr(regs);
if (!addr)
return;
outb(inb(addr+SEROFF_LCR) | 0x80, addr+SEROFF_LCR);
if ((regs->al & 0xE0) == 0) {
outb(0x17, addr+SEROFF_DLL);
outb(0x04, addr+SEROFF_DLH);
} else {
u16 val16 = 0x600 >> ((regs->al & 0xE0) >> 5);
outb(val16 & 0xFF, addr+SEROFF_DLL);
outb(val16 >> 8, addr+SEROFF_DLH);
}
outb(regs->al & 0x1F, addr+SEROFF_LCR);
regs->ah = inb(addr+SEROFF_LSR);
regs->al = inb(addr+SEROFF_MSR);
set_success(regs);
}
// SERIAL - WRITE CHARACTER TO PORT
static void
handle_1401(struct bregs *regs)
{
u16 addr = getComAddr(regs);
if (!addr)
return;
u32 end = irqtimer_calc_ticks(GET_BDA(com_timeout[regs->dx]));
for (;;) {
u8 lsr = inb(addr+SEROFF_LSR);
if ((lsr & 0x60) == 0x60) {
// Success - can write data
outb(regs->al, addr+SEROFF_DATA);
// XXX - reread lsr?
regs->ah = lsr;
break;
}
if (irqtimer_check(end)) {
// Timed out - can't write data.
regs->ah = lsr | 0x80;
break;
}
yield();
}
set_success(regs);
}
// SERIAL - READ CHARACTER FROM PORT
static void
handle_1402(struct bregs *regs)
{
u16 addr = getComAddr(regs);
if (!addr)
return;
u32 end = irqtimer_calc_ticks(GET_BDA(com_timeout[regs->dx]));
for (;;) {
u8 lsr = inb(addr+SEROFF_LSR);
if (lsr & 0x01) {
// Success - can read data
regs->al = inb(addr+SEROFF_DATA);
regs->ah = lsr;
break;
}
if (irqtimer_check(end)) {
// Timed out - can't read data.
regs->ah = lsr | 0x80;
break;
}
yield();
}
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+SEROFF_LSR);
regs->al = inb(addr+SEROFF_MSR);
set_success(regs);
}
static void
handle_14XX(struct bregs *regs)
{
set_unimplemented(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;
}
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;
}
}
// XXX - Baud Rate Generator Table
u8 BaudTable[16] VAR16FIXED(0xe729);
/****************************************************************
* 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(void)
{
if (! CONFIG_LPT)
return;
dprintf(3, "init lpt\n");
u16 count = 0;
count += detect_parport(PORT_LPT1, 0x14, count);
count += detect_parport(PORT_LPT2, 0x14, count);
dprintf(1, "Found %d lpt ports\n", count);
// Equipment word bits 14..15 determing # parallel ports
set_equipment_flags(0xc000, count << 14);
}
static u16
getLptAddr(struct bregs *regs)
{
if (regs->dx >= 3) {
set_invalid(regs);
return 0;
}
u16 addr = GET_BDA(port_lpt[regs->dx]);
if (! addr)
set_invalid(regs);
return addr;
}
// INT 17 - PRINTER - WRITE CHARACTER
static void
handle_1700(struct bregs *regs)
{
u16 addr = getLptAddr(regs);
if (!addr)
return;
u32 end = irqtimer_calc_ticks(GET_BDA(lpt_timeout[regs->dx]));
outb(regs->al, addr);
u8 val8 = inb(addr+2);
outb(val8 | 0x01, addr+2); // send strobe
udelay(5);
outb(val8 & ~0x01, addr+2);
for (;;) {
u8 v = inb(addr+1);
if (!(v & 0x40)) {
// Success
regs->ah = v ^ 0x48;
break;
}
if (irqtimer_check(end)) {
// Timeout
regs->ah = (v ^ 0x48) | 0x01;
break;
}
yield();
}
set_success(regs);
}
// INT 17 - PRINTER - INITIALIZE PORT
static void
handle_1701(struct bregs *regs)
{
u16 addr = getLptAddr(regs);
if (!addr)
return;
u8 val8 = inb(addr+2);
outb(val8 & ~0x04, addr+2); // send init
udelay(5);
outb(val8 | 0x04, addr+2);
regs->ah = inb(addr+1) ^ 0x48;
set_success(regs);
}
// INT 17 - PRINTER - GET STATUS
static void
handle_1702(struct bregs *regs)
{
u16 addr = getLptAddr(regs);
if (!addr)
return;
regs->ah = inb(addr+1) ^ 0x48;
set_success(regs);
}
static void
handle_17XX(struct bregs *regs)
{
set_unimplemented(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;
}
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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