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TOMOYO Linux Cross Reference
Linux/include/linux/i8253.h

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  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  *  Machine specific IO port address definition for generic.
  7  *  Written by Osamu Tomita <tomita@cinet.co.jp>
  8  */
  9 #ifndef __LINUX_I8253_H
 10 #define __LINUX_I8253_H
 11 
 12 #include <linux/param.h>
 13 #include <linux/spinlock.h>
 14 #include <linux/timex.h>
 15 
 16 /* i8253A PIT registers */
 17 #define PIT_MODE        0x43
 18 #define PIT_CH0         0x40
 19 #define PIT_CH2         0x42
 20 
 21 #define PIT_LATCH       ((PIT_TICK_RATE + HZ/2) / HZ)
 22 
 23 extern raw_spinlock_t i8253_lock;
 24 extern bool i8253_clear_counter_on_shutdown;
 25 extern struct clock_event_device i8253_clockevent;
 26 extern void clockevent_i8253_init(bool oneshot);
 27 
 28 extern void setup_pit_timer(void);
 29 
 30 #endif /* __LINUX_I8253_H */
 31
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