直接从CMOS读取系统时间

直接从CMOS读取系统时间收藏

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following code come from Linux Kernel 0.01

#define CMOS_READ(addr) ({ /

outb_p(0x80|addr,0x70); /

inb_p(0x71); /

})

#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)

static void time_init(void)

{

struct tm time;

do {

time.tm_sec = CMOS_READ(0);

time.tm_min = CMOS_READ(2);

time.tm_hour = CMOS_READ(4);

time.tm_mday = CMOS_READ(7);

time.tm_mon = CMOS_READ(8)-1;

time.tm_year = CMOS_READ(9);

} while (time.tm_sec != CMOS_READ(0));

BCD_TO_BIN(time.tm_sec);

BCD_TO_BIN(time.tm_min);

BCD_TO_BIN(time.tm_hour);

BCD_TO_BIN(time.tm_mday);

BCD_TO_BIN(time.tm_mon);

BCD_TO_BIN(time.tm_year);

startup_time = kernel_mktime(&time);

}