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Linux kernel mirror (for testing)
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1#ifndef _ASM_POWERPC_TIMEX_H
2#define _ASM_POWERPC_TIMEX_H
3
4#ifdef __KERNEL__
5
6/*
7 * PowerPC architecture timex specifications
8 */
9
10#include <asm/cputable.h>
11#include <asm/reg.h>
12
13#define CLOCK_TICK_RATE 1024000 /* Underlying HZ */
14
15typedef unsigned long cycles_t;
16
17static inline cycles_t get_cycles(void)
18{
19#ifdef __powerpc64__
20 return mftb();
21#else
22 cycles_t ret;
23
24 /*
25 * For the "cycle" counter we use the timebase lower half.
26 * Currently only used on SMP.
27 */
28
29 ret = 0;
30
31 __asm__ __volatile__(
32 "97: mftb %0\n"
33 "99:\n"
34 ".section __ftr_fixup,\"a\"\n"
35 ".align 2\n"
36 "98:\n"
37 " .long %1\n"
38 " .long 0\n"
39 " .long 97b-98b\n"
40 " .long 99b-98b\n"
41 ".previous"
42 : "=r" (ret) : "i" (CPU_FTR_601));
43 return ret;
44#endif
45}
46
47#endif /* __KERNEL__ */
48#endif /* _ASM_POWERPC_TIMEX_H */