84 lines
1.6 KiB
C
84 lines
1.6 KiB
C
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/*
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* mjs copyright
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*/
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#include <stand.h>
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#include <btxv86.h>
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#ifdef PC98
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#include <machine/cpufunc.h>
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#endif
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/*
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* Return the time in seconds since the beginning of the day.
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*
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* If we pass midnight, don't wrap back to 0.
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*
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* XXX uses undocumented BCD support from libstand.
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*/
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time_t
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time(time_t *t)
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{
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static time_t lasttime, now;
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int hr, min, sec;
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#ifdef PC98
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unsigned char bios_time[6];
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#endif
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v86.ctl = 0;
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#ifdef PC98
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v86.addr = 0x1c; /* int 0x1c, function 0 */
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v86.eax = 0x0000;
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v86.es = VTOPSEG(bios_time);
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v86.ebx = VTOPOFF(bios_time);
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#else
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v86.addr = 0x1a; /* int 0x1a, function 2 */
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v86.eax = 0x0200;
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#endif
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v86int();
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#ifdef PC98
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hr = bcd2bin(bios_time[3]);
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min = bcd2bin(bios_time[4]);
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sec = bcd2bin(bios_time[5]);
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#else
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hr = bcd2bin((v86.ecx & 0xff00) >> 8); /* hour in %ch */
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min = bcd2bin(v86.ecx & 0xff); /* minute in %cl */
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sec = bcd2bin((v86.edx & 0xff00) >> 8); /* second in %dh */
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#endif
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now = hr * 3600 + min * 60 + sec;
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if (now < lasttime)
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now += 24 * 3600;
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lasttime = now;
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if (t != NULL)
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*t = now;
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return(now);
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}
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/*
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* Use the BIOS Wait function to pause for (period) microseconds.
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*
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* Resolution of this function is variable, but typically around
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* 1ms.
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*/
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void
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delay(int period)
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{
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#ifdef PC98
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int i;
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period = (period + 500) / 1000;
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for( ; period != 0 ; period--)
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for(i=800;i != 0; i--)
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outb(0x5f,0); /* wait 600ns */
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#else
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v86.ctl = 0;
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v86.addr = 0x15; /* int 0x15, function 0x86 */
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v86.eax = 0x8600;
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v86.ecx = period >> 16;
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v86.edx = period & 0xffff;
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v86int();
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#endif
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}
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