Source to arch/i386/isa/spkr_reg.h


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/*
 * PIT port addresses and speaker control values
 */

#define PITAUX_PORT	0x61	/* port of Programmable Peripheral Interface */
#define PIT_ENABLETMR2	0x01	/* Enable timer/counter 2 */
#define PIT_SPKRDATA	0x02	/* Direct to speaker */

#define PIT_SPKR	(PIT_ENABLETMR2|PIT_SPKRDATA)