rtc.c File Reference

#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <sys/kassert.h>
#include <sys/kdebug.h>
#include <sys/ktime.h>
#include "ioport.h"

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Macros
#define	RTC_SECONDS   0x00
#define	RTC_MINUTES   0x02
#define	RTC_HOURS   0x04
#define	RTC_WEEKDAY   0x06
#define	RTC_DAY   0x07
#define	RTC_MONTH   0x08
#define	RTC_YEAR   0x09
#define	BCD_TO_BIN(_B)   ((_B & 0x0F) + ((_B >> 4) * 10))

Functions
UnixEpoch	RTC_ReadTime ()
void	RTC_Init ()
static uint8_t	RTC_ReadReg (uint8_t reg)

Macro Definition Documentation

BCD_TO_BIN

#define BCD_TO_BIN

(

_B

)

((_B & 0x0F) + ((_B >> 4) * 10))

RTC_DAY

#define RTC_DAY   0x07

Definition at line 16 of file rtc.c.

RTC_HOURS

#define RTC_HOURS   0x04

Definition at line 14 of file rtc.c.

RTC_MINUTES

#define RTC_MINUTES   0x02

Definition at line 13 of file rtc.c.

RTC_MONTH

#define RTC_MONTH   0x08

Definition at line 17 of file rtc.c.

RTC_SECONDS

#define RTC_SECONDS   0x00

Definition at line 12 of file rtc.c.

RTC_WEEKDAY

#define RTC_WEEKDAY   0x06

Definition at line 15 of file rtc.c.

RTC_YEAR

#define RTC_YEAR   0x09

Definition at line 18 of file rtc.c.

Function Documentation

RTC_Init()

void RTC_Init

(

)

Definition at line 23 of file rtc.c.

{
    uint64_t startTSC, stopTSC;
    UnixEpoch first, second;
 
    kprintf("RTC: Measuring CPU clock...\n");
 
    first = RTC_ReadTime();
    while (1) {
        second = RTC_ReadTime();
        if (first != second)
            break;
        first = second;
    }
    startTSC = Time_GetTSC();
 
    first = RTC_ReadTime();
    while (1) {
        second = RTC_ReadTime();
        if (first != second)
            break;
        first = second;
    }
    stopTSC = Time_GetTSC();
 
    kprintf("RTC: %lld Ticks Per Second: %lld\n", second, stopTSC - startTSC);
 
    KTime_SetTime(second, stopTSC, stopTSC - startTSC);
}

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RTC_ReadReg()

static uint8_t RTC_ReadReg ( uint8_t  reg )

inlinestatic

Definition at line 54 of file rtc.c.

{
    outb(0x70, reg);
    return inb(0x71);
}

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RTC_ReadTime()

UnixEpoch RTC_ReadTime

(

)

Definition at line 61 of file rtc.c.

{
    KTime tm;
    bool isPM = false;
    uint8_t flags = RTC_ReadReg(0x0B);
 
    // Read RTC
    tm.sec = RTC_ReadReg(RTC_SECONDS);
    tm.min = RTC_ReadReg(RTC_MINUTES);
    tm.hour = RTC_ReadReg(RTC_HOURS);
    tm.wday = RTC_ReadReg(RTC_WEEKDAY);
    tm.mday = RTC_ReadReg(RTC_DAY);
    tm.month = RTC_ReadReg(RTC_MONTH);
    tm.year = RTC_ReadReg(RTC_YEAR);
 
    // Convert BCD & 24-hour checks
    if (tm.hour & 0x80) {
        isPM = true;
    }
    if ((flags & 0x04) == 0) {
#define BCD_TO_BIN(_B) ((_B & 0x0F) + ((_B >> 4) * 10))
        tm.sec = BCD_TO_BIN(tm.sec);
        tm.min = BCD_TO_BIN(tm.min);
        tm.hour = BCD_TO_BIN((tm.hour & 0x7F));
        tm.wday = BCD_TO_BIN(tm.wday);
        tm.mday = BCD_TO_BIN(tm.mday);
        tm.month = BCD_TO_BIN(tm.month);
        tm.year = BCD_TO_BIN(tm.year);
    }
    if (((flags & 0x02) == 0) && isPM) {
        tm.hour = (tm.hour + 12) % 24;
    }
 
    tm.year += 2000;
    tm.yday = -1;
 
    tm.wday -= 1;
    tm.month -= 1;
 
//    KTime_SetTime(&tm);
    return KTime_ToEpoch(&tm);
}

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