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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 <linux/config.h>
11 #include <asm/cputable.h>
12
13 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
14
15 typedef unsigned long cycles_t;
16
17 static inline cycles_t get_cycles(void)
18 {
19         cycles_t ret;
20
21 #ifdef __powerpc64__
22
23         __asm__ __volatile__("mftb %0" : "=r" (ret) : );
24
25 #else
26         /*
27          * For the "cycle" counter we use the timebase lower half.
28          * Currently only used on SMP.
29          */
30
31         ret = 0;
32
33         __asm__ __volatile__(
34                 "98:    mftb %0\n"
35                 "99:\n"
36                 ".section __ftr_fixup,\"a\"\n"
37                 "       .long %1\n"
38                 "       .long 0\n"
39                 "       .long 98b\n"
40                 "       .long 99b\n"
41                 ".previous"
42                 : "=r" (ret) : "i" (CPU_FTR_601));
43 #endif
44
45         return ret;
46 }
47
48 #endif  /* __KERNEL__ */
49 #endif  /* _ASM_POWERPC_TIMEX_H */