WDT_EFER
outb(reg, WDT_EFER);
outb(reg, WDT_EFER);
outb_p(wdt_cfg_enter, WDT_EFER); /* Enter extended function mode */
outb_p(wdt_cfg_enter, WDT_EFER); /* Again according to manual */
outb_p(wdt_cfg_leave, WDT_EFER); /* Leave extended function mode */