Merge branch 'simplify_PRT' into release
[linux-2.6] / arch / powerpc / include / asm / timex.h
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
15 typedef unsigned long cycles_t;
16
17 static 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                 "       .long 0\n"
42                 "       .long 0\n"
43                 ".previous"
44                 : "=r" (ret) : "i" (CPU_FTR_601));
45         return ret;
46 #endif
47 }
48
49 #endif  /* __KERNEL__ */
50 #endif  /* _ASM_POWERPC_TIMEX_H */