xref: /OK3568_Linux_fs/kernel/tools/perf/arch/x86/util/tsc.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/types.h>
3*4882a593Smuzhiyun 
4*4882a593Smuzhiyun #include "../../../util/tsc.h"
5*4882a593Smuzhiyun 
rdtsc(void)6*4882a593Smuzhiyun u64 rdtsc(void)
7*4882a593Smuzhiyun {
8*4882a593Smuzhiyun 	unsigned int low, high;
9*4882a593Smuzhiyun 
10*4882a593Smuzhiyun 	asm volatile("rdtsc" : "=a" (low), "=d" (high));
11*4882a593Smuzhiyun 
12*4882a593Smuzhiyun 	return low | ((u64)high) << 32;
13*4882a593Smuzhiyun }
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