Linux 0.12ÄÚºË
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1. linux/init/main.c
/*
* read current time from CMOS.
* ·ÃÎÊCMOSÐèҪͨ¹ý¶Ë¿Ú0x70, 0x71½øÐÐ.
* ¶ÁÊý¾Ýʱ,ÏÈÓÃOUTÖ¸ÁîÏò0x70·¢ËÍÒª¶ÁÈ¡×Ö½ÚµÄÆ«ÒÆÎ»ÖÃÖµ, È»ºóÓÃINÖ¸Áî´Ó0x71¶ÁÊý¾Ý.
* дÊý¾ÝʱҲһÑù, ÏÈÏò0x70·¢ËÍÆ«ÒÆÖµ, È»ºóÓÃOUTÖ¸ÁîÏò0x71¶Ë¿Ú·¢ËÍÊý¾Ý.
*/
#define CMOS_READ(addr) ({ \
outb_p(0x80|addr,0x70); \
inb_p(0x71); \
})
/*
* CMOS ×Ö½ÚÐÅÏ¢:
* 0x00 - µ±Ç°Ãë. 0x02 - µ±Ç°·Ö. 0x04 - µ±Ç°Ð¡Ê±. 0x06 - Ò»ÖÜÖеĵ±Ç°Ìì.
* 0x07 - Ò»ÔÂÖеĵ±Ç°ÈÕÆÚ. 0x08 - µ±Ç°Ô·Ý. 0x09 - µ±Ç°Äê·Ý
*/
/* ½«È¡µÃµÄBCDÂëת»»ÎªÊýÖµ */
#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
/*
* ³õʼ»¯¿ª»úʱ¼ä, ÓÉmain()µ÷ÓÃ.
*/
static void time_init(void)
{
struct tm time;
do {
time.tm_sec = CMOS_READ(0); /* ¶ÁÈ¡µ±Ç°ÃëÖµ */
time.tm_min = CMOS_READ(2); /* ¶ÁÈ¡µ±Ç°·ÖÖµ */
time.tm_hour = CMOS_READ(4);
time.tm_mday = CMOS_READ(7);
time.tm_mon = CMOS_READ(8); /* ¶ÁÈ¡µ±Ç°ÔÂ·Ý ( 1 - 12) */
time.tm_year = CMOS_READ(9);
} while (time.tm_sec != CMOS_READ(0)); /* Èç¹ûÃëÖµÒѾ·¢Éú±ä»¯¾ÍÖØÐ¶ÁÒ»±é£¬
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# make
# make install
# cd /home/redadmin/mysql/
# cp share/mysql/my-medium.cnf ./
# mv my-medium.cnf my.cnf
// my.confÎļþÐÞ¸Ä
# vi my.cnf
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