#include "util.h" // debug_enter
#include "bregs.h" // struct bregs
-// Timers based on 18.2Hz clock irq.
-struct tick_timer_s {
- u16 last_tick, remaining;
-};
-
-struct tick_timer_s
-initTickTimer(u16 count)
-{
- struct tick_timer_s tt = {GET_BDA(timer_counter), count};
- return tt;
-}
-
-int
-checkTickTimer(struct tick_timer_s *tt)
-{
- u16 timer = GET_BDA(timer_counter);
- if (tt->last_tick != timer) {
- tt->last_tick = timer;
- tt->last_tick--;
- if (!tt->last_tick)
- return 1;
- }
- return 0;
-}
-
/****************************************************************
* COM ports
}
void
-serial_setup()
+serial_setup(void)
{
if (! CONFIG_SERIAL)
return;
getComAddr(struct bregs *regs)
{
if (regs->dx >= 4) {
- set_fail(regs);
+ set_invalid(regs);
return 0;
}
u16 addr = GET_BDA(port_com[regs->dx]);
if (! addr)
- set_fail(regs);
+ set_invalid(regs);
return addr;
}
u16 addr = getComAddr(regs);
if (!addr)
return;
- struct tick_timer_s tt = initTickTimer(GET_BDA(com_timeout[regs->dx]));
- irq_enable();
+ u32 end = calc_future_timer_ticks(GET_BDA(com_timeout[regs->dx]));
for (;;) {
u8 lsr = inb(addr+SEROFF_LSR);
if ((lsr & 0x60) == 0x60) {
regs->ah = lsr;
break;
}
- if (checkTickTimer(&tt)) {
+ if (check_timer(end)) {
// Timed out - can't write data.
regs->ah = lsr | 0x80;
break;
}
+ yield();
}
- irq_disable();
set_success(regs);
}
u16 addr = getComAddr(regs);
if (!addr)
return;
- struct tick_timer_s tt = initTickTimer(GET_BDA(com_timeout[regs->dx]));
- irq_enable();
+ u32 end = calc_future_timer_ticks(GET_BDA(com_timeout[regs->dx]));
for (;;) {
u8 lsr = inb(addr+SEROFF_LSR);
if (lsr & 0x01) {
regs->ah = lsr;
break;
}
- if (checkTickTimer(&tt)) {
+ if (check_timer(end)) {
// Timed out - can't read data.
regs->ah = lsr | 0x80;
break;
}
+ yield();
}
- irq_disable();
set_success(regs);
}
static void
handle_14XX(struct bregs *regs)
{
- // Unsupported
- set_fail(regs);
+ set_unimplemented(regs);
}
// INT 14h Serial Communications Service Entry Point
}
void
-lpt_setup()
+lpt_setup(void)
{
if (! CONFIG_LPT)
return;
getLptAddr(struct bregs *regs)
{
if (regs->dx >= 3) {
- set_fail(regs);
+ set_invalid(regs);
return 0;
}
u16 addr = GET_BDA(port_lpt[regs->dx]);
if (! addr)
- set_fail(regs);
+ set_invalid(regs);
return addr;
}
if (!addr)
return;
- struct tick_timer_s tt = initTickTimer(GET_BDA(lpt_timeout[regs->dx]));
- irq_enable();
+ u32 end = calc_future_timer_ticks(GET_BDA(lpt_timeout[regs->dx]));
outb(regs->al, addr);
u8 val8 = inb(addr+2);
regs->ah = v ^ 0x48;
break;
}
- if (checkTickTimer(&tt)) {
+ if (check_timer(end)) {
// Timeout
regs->ah = (v ^ 0x48) | 0x01;
break;
}
+ yield();
}
- irq_disable();
set_success(regs);
}
static void
handle_17XX(struct bregs *regs)
{
- // Unsupported
- set_fail(regs);
+ set_unimplemented(regs);
}
// INT17h : Printer Service Entry Point