include/aarch64/delay.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  * ARM simple delay routines
0004  */
0005
0006 #ifndef SELFTEST_KVM_ARM_DELAY_H
0007 #define SELFTEST_KVM_ARM_DELAY_H
0008
0009 #include "arch_timer.h"
0010
0011 static inline void __delay(uint64_t cycles)
0012 {
0013     enum arch_timer timer = VIRTUAL;
0014     uint64_t start = timer_get_cntct(timer);
0015
0016     while ((timer_get_cntct(timer) - start) < cycles)
0017         cpu_relax();
0018 }
0019
0020 static inline void udelay(unsigned long usec)
0021 {
0022     __delay(usec_to_cycles(usec));
0023 }
0024
0025 #endif /* SELFTEST_KVM_ARM_DELAY_H */