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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * include/asm-ppc/timex.h
3 *
4 * ppc architecture timex specifications
5 */
6#ifdef __KERNEL__
7#ifndef _ASMppc_TIMEX_H
8#define _ASMppc_TIMEX_H
9
10#include <linux/config.h>
11#include <asm/cputable.h>
12
13#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
14
15typedef unsigned long cycles_t;
16
17/*
18 * For the "cycle" counter we use the timebase lower half.
19 * Currently only used on SMP.
20 */
21
22static inline cycles_t get_cycles(void)
23{
24 cycles_t ret = 0;
25
26 __asm__ __volatile__(
27 "98: mftb %0\n"
28 "99:\n"
29 ".section __ftr_fixup,\"a\"\n"
30 " .long %1\n"
31 " .long 0\n"
32 " .long 98b\n"
33 " .long 99b\n"
34 ".previous"
35 : "=r" (ret) : "i" (CPU_FTR_601));
36 return ret;
37}
38
39#endif
40#endif /* __KERNEL__ */