ipxe/src/arch/i386/include/latch.h

#ifndef LATCH_H
#define LATCH_H

#define	TICKS_PER_SEC		18

/* For different calibrators of the TSC move the declaration of
 * sleep_latch and the definitions of it's length here...
 */

extern unsigned long currticks ( void );

#endif /* LATCH_H */