mirror of
git://git.yoctoproject.org/linux-yocto.git
synced 2025-08-22 00:42:01 +02:00
8016690465
Add udelay() support to generate a delay in the guest. The routines are derived and simplified from kernel's arch/arm64/lib/delay.c. Signed-off-by: Raghavendra Rao Ananta <rananta@google.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Reviewed-by: Oliver Upton <oupton@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20211007233439.1826892-8-rananta@google.com
26 lines
481 B
C
26 lines
481 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* ARM simple delay routines
|
|
*/
|
|
|
|
#ifndef SELFTEST_KVM_ARM_DELAY_H
|
|
#define SELFTEST_KVM_ARM_DELAY_H
|
|
|
|
#include "arch_timer.h"
|
|
|
|
static inline void __delay(uint64_t cycles)
|
|
{
|
|
enum arch_timer timer = VIRTUAL;
|
|
uint64_t start = timer_get_cntct(timer);
|
|
|
|
while ((timer_get_cntct(timer) - start) < cycles)
|
|
cpu_relax();
|
|
}
|
|
|
|
static inline void udelay(unsigned long usec)
|
|
{
|
|
__delay(usec_to_cycles(usec));
|
|
}
|
|
|
|
#endif /* SELFTEST_KVM_ARM_DELAY_H */
|