RTEMS  5.1
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c_clock.h
1 /*
2  * Clock Tick Device Driver
3  *
4  * This routine utilizes the Decrementer Register common to the PPC family.
5  *
6  * The tick frequency is directly programmed to the configured number of
7  * microseconds per tick.
8  *
9  * COPYRIGHT (c) 1989-1997.
10  * On-Line Applications Research Corporation (OAR).
11  *
12  * The license and distribution terms for this file may in
13  * the file LICENSE in this distribution or at
14  * http://www.rtems.org/license/LICENSE.
15  *
16  * Modified to support the MPC750.
17  * Modifications Copyright (c) 1999 Eric Valette valette@crf.canon.fr
18  */
19 
20 #ifndef _LIBCPU_C_CLOCK_H
21 #define _LIBCPU_C_CLOCK_H
22 
23 #include <rtems.h>
24 
25 /*
26  * These functions and variables represent the API exported by the
27  * CPU to the BSP.
28  */
29 
30 extern void clockOff (void* unused);
31 extern void clockOn (void* unused);
32 extern void clockIsr (void* unused);
33 /* bookE decrementer is slightly different */
34 extern void clockIsrBookE (void *unused);
35 extern int clockIsOn (void* unused);
36 
37 /*
38  * These functions and variables represent the assumptions of this
39  * driver on the BSP.
40  */
41 
42 extern int BSP_disconnect_clock_handler (void);
43 /*
44  * PCI Bus Frequency
45  */
46 extern unsigned int BSP_bus_frequency;
47 /*
48  * processor clock frequency
49  */
50 extern unsigned int BSP_processor_frequency;
51 /*
52  * Time base divisior (how many tick for 1 second).
53  */
54 extern unsigned int BSP_time_base_divisor;
55 
56 #endif
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