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authorKevin O'Connor <kevin@koconnor.net>2008-02-25 22:30:47 -0500
committerKevin O'Connor <kevin@koconnor.net>2008-02-25 22:30:47 -0500
commit38fcbfeebc7ce9c1aa940c1b98f6141f161a6ff4 (patch)
tree31ca1bb3a2f9a8d44695df13a183d01ca87abe3e /src/serial.c
parent4b60c000deee2002ba272b45a1121df7495c39f9 (diff)
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Version 0.1.2rel-0.1.2
Diffstat (limited to 'src/serial.c')
-rw-r--r--src/serial.c209
1 files changed, 209 insertions, 0 deletions
diff --git a/src/serial.c b/src/serial.c
index 5541089..63d1766 100644
--- a/src/serial.c
+++ b/src/serial.c
@@ -8,11 +8,210 @@
#include "biosvar.h" // struct bregs
#include "util.h" // debug_enter
+
+/****************************************************************
+ * COM ports
+ ****************************************************************/
+
+static u16
+getComAddr(struct bregs *regs)
+{
+ if (regs->dx >= 4) {
+ set_cf(regs, 1);
+ return 0;
+ }
+ u16 addr = GET_BDA(port_com[regs->dx]);
+ if (! addr)
+ set_cf(regs, 1);
+ return addr;
+}
+
+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_cf(regs, 0);
+}
+
+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_cf(regs, 0);
+}
+
+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_cf(regs, 0);
+}
+
+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_cf(regs, 0);
+}
+
+static void
+handle_14XX(struct bregs *regs)
+{
+ // Unsupported
+ set_cf(regs, 1);
+}
+
// INT 14h Serial Communications Service Entry Point
void VISIBLE
handle_14(struct bregs *regs)
{
debug_enter(regs);
+
+ 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;
+ }
+ debug_exit(regs);
+}
+
+
+/****************************************************************
+ * LPT ports
+ ****************************************************************/
+
+static u16
+getLptAddr(struct bregs *regs)
+{
+ if (regs->dx >= 3) {
+ set_cf(regs, 1);
+ return 0;
+ }
+ u16 addr = GET_BDA(port_lpt[regs->dx]);
+ if (! addr)
+ set_cf(regs, 1);
+ 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_cf(regs, 0);
+}
+
+// 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_cf(regs, 1);
}
// INT17h : Printer Service Entry Point
@@ -20,4 +219,14 @@ void VISIBLE
handle_17(struct bregs *regs)
{
debug_enter(regs);
+
+ 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;
+ }
+ debug_exit(regs);
}