need to program grub by hour and date?

[adrian15]

Hi. I am planning to add some commands to Grub in order to work with 
hour and date.

I need situations on which this will be useful and requests on how would 
the commands will be run.

I propose you two situations.

1) Situation. Clusters
  In an university or high school BIOS are set to be awake at 00:00 hours.
  Grub checks it is 00:00 or later but not later than 07:00 (when the 
lessons begin) and runs an special boot entry for making the computer a 
cluster client.

2) Situation. Lessons on high school.
  Teachers and pupils don't dominate Grub menu... you have to press 
keys with strange arrows and it is difficult. What a stupid program! We 
cannot use Mouse!
  So... menu.lst file is set up with the new dayow, and hour commands 
so that the timetable is reflected when there's a classroom related to 
computer sciences Linux is boot and when there's an English or Physics 
classroom Windows is boot.

So I am waiting your thoughts.


The idea would be commands such as:

dayow 1 4 : Gives error if it's not Monday, Tuesday, Wednesday or Thursday.
dayom 1 4 : Gives error if it's not 1 or 2 or 3 or 4 on the current month.
hour 22 00 07 00 : Gives error if it's a time between 07:01 AM and 09:59 
PM (21:59h).

If you have seen Super Grub Disk source code you will know that I will 
use default and fallback entries to boot one thing or another depending 
on errors.

I have some code to use on the commands but I have not yet worked on them:

#define RTC_PORT_WRITE        0x70
#define RTC_PORT_READ         0x71

#define RTC_REG_SECOND        0x00
#define RTC_REG_MINUTE        0x02
#define RTC_REG_HOUR          0x04
#define RTC_REG_DOW           0x06
#define RTC_REG_DAY           0x07
#define RTC_REG_MONTH         0x08
#define RTC_REG_YEAR          0x09



#define NIBBLE2DEC(x)    (((x&0xf0)>>4)*10 + (x&0x0f) )
/* alternativa: no hacer nada
#define NIBBLE2DEC(x)    (x)
*/

void rtc_read(void)
{
    /* variables: hacer algo con ellas, o globales o lo que sea */
    char second, minute, hour;
    char weekdate, day, month, year;

    /* Leer time */
    outb(RTC_PORT_WRITE, RTC_REG_SECOND);
    second = NIBBLE2DEC(inb(RTC_PORT_READ));

    outb(RTC_PORT_WRITE, RTC_REG_MINUTE);
    minute = NIBBLE2DEC(inb(RTC_PORT_READ));

    outb(RTC_PORT_WRITE, RTC_REG_HOUR);
    hour = NIBBLE2DEC(inb(RTC_PORT_READ));

    /* Leer fecha */
    outb(RTC_PORT_WRITE, RTC_REG_DOW);
    weekdate = inb(RTC_PORT_READ);

    outb(RTC_PORT_WRITE, RTC_REG_DAY);
    day = NIBBLE2DEC(inb(RTC_PORT_READ));

    outb(RTC_PORT_WRITE, RTC_REG_MONTH);
    month = NIBBLE2DEC(inb(RTC_PORT_READ));

    outb(RTC_PORT_WRITE, RTC_REG_YEAR);
    year = NIBBLE2DEC(inb(RTC_PORT_READ));

}

void rtc_read(void)
{
    /* variables: hacer algo con ellas, o globales o lo que sea */
    char second, minute, hour;
    char weekdate, day, month, year;
    char string[18], *str;

    /* Leer time */
    outb(RTC_PORT_WRITE, RTC_REG_SECOND;
    second = inb(RTC_PORT_READ);

    outb(RTC_PORT_WRITE, RTC_REG_MINUTE;
    minute = inb(RTC_PORT_READ);

    outb(RTC_PORT_WRITE, RTC_REG_HOUR;
    hour = inb(RTC_PORT_READ);

    /* Leer fecha */
    outb(RTC_PORT_WRITE, RTC_REG_DOW;
    weekdate = inb(RTC_PORT_READ;

    outb(RTC_PORT_WRITE, RTC_REG_DAY;
    day = inb(RTC_PORT_READ);

    outb(RTC_PORT_WRITE, RTC_REG_MONTH;
    month = inb(RTC_PORT_READ);

    outb(RTC_PORT_WRITE, RTC_REG_YEAR;
    year = inb(RTC_PORT_READ);

    str = string;
    *str++ = (day>>4)+'0';
    *str++ = (day&0x0f)+'0';
    *str++ = "/";
    *str++ = (month>>4)+'0';
    *str++ = (month&0x0f)+'0';
    *str++ = "/";
    *str++ = (year>>4)+'0';
    *str++ = (year&0x0f)+'0';
    *str++ = " ";
    *str++ = (hour>>4)+'0';
    *str++ = (hour&0x0f)+'0';
    *str++ = ":";
    *str++ = (minute>>4)+'0';
    *str++ = (minute&0x0f)+'0';
    *str++ = ":";
    *str++ = (second>>4)+'0';
    *str++ = (second&0x0f)+'0';
    *str++ = 0;
}

adrian15