// 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 GPLv3 license.
+// This file may be distributed under the terms of the GNU LGPLv3 license.
-#include "biosvar.h" // struct bregs
+#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 VISIBLE
+void VISIBLE16
handle_14(struct bregs *regs)
{
- debug_enter(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 VISIBLE
+void VISIBLE16
handle_17(struct bregs *regs)
{
- debug_enter(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;
+ }
}
projects / seabios.git / blobdiff