1a63d7e08e
- better 8250 emulation; - fake vertical retrace bit in Input Status #1 register (this was lost in the VGA emu rewrite). Submitted by: Igor Serikov <bt@turtle.pangeatech.com>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/*
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** No copyright?!
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**
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** $FreeBSD$
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*/
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#include "doscmd.h"
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static void
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int08(regcontext_t *REGS)
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{
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*(u_long *)&BIOSDATA[0x6c] += 1; /* ticks since midnight */
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while (*(u_long *)&BIOSDATA[0x6c] >= 24*60*6*182) {
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*(u_long *)&BIOSDATA[0x6c] -= 24*60*6*182;
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BIOSDATA[0x70]++; /* # times past mn */
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}
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/* What is the real BIOS' sequence? */
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send_eoi();
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softint(0x1c);
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}
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static void
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int1c(regcontext_t *REGS)
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{
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}
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unsigned char timer;
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static u_char
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inb_timer(int port)
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{
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return (--timer);
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}
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void
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timer_init(void)
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{
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u_long vec;
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struct itimerval itv;
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struct timeval tv;
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time_t tv_sec;
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struct timezone tz;
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struct tm tm;
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vec = insert_hardint_trampoline();
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ivec[0x08] = vec;
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register_callback(vec, int08, "int 08");
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vec = insert_softint_trampoline();
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ivec[0x1c] = vec;
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register_callback(vec, int1c, "int 1c");
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define_input_port_handler(0x42, inb_timer);
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define_input_port_handler(0x40, inb_timer);
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/* Initialize time counter BIOS variable. */
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gettimeofday(&tv, &tz);
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tv_sec = tv.tv_sec;
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tm = *localtime(&tv_sec);
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*(u_long *)&BIOSDATA[0x6c] =
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(((tm.tm_hour * 60 + tm.tm_min) * 60) + tm.tm_sec) * 182 / 10;
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itv.it_interval.tv_sec = 0;
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itv.it_interval.tv_usec = 54925; /* 1193182/65536 times per second */
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itv.it_value.tv_sec = 0;
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itv.it_value.tv_usec = 54925; /* 1193182/65536 times per second */
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if (! timer_disable)
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setitimer(ITIMER_REAL, &itv, 0);
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}
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