Source of /tests/apple_generic_timer.c (From xnu-12377.1.9)

#include <darwintest.h>
#include <sys/sysctl.h>
#include "apple_generic_timer.h"
#include "test_utils.h"

T_GLOBAL_META(
	T_META_NAMESPACE("xnu.arm"),
	T_META_RADAR_COMPONENT_NAME("xnu"),
	T_META_RADAR_COMPONENT_VERSION("arm"),
	T_META_ENABLED(TARGET_CPU_ARM64),
	T_META_OWNER("xi_han"),
	T_META_RUN_CONCURRENTLY(true),
	XNU_T_META_SOC_SPECIFIC
	);

#define AIDR_AGT (1ULL << 32)
T_DECL(apple_generic_timer,
    "Test that CNTFRQ_EL0 reads the correct frequency")
{
	uint64_t aidr;
	size_t sysctl_size = sizeof(aidr);
	sysctlbyname("machdep.cpu.sysreg_AIDR_EL1", &aidr, &sysctl_size, NULL, 0);

	const bool has_agt = aidr & AIDR_AGT;

	/* When AIDR_AGT is set, expect 1 GHz; otherwise expect 24 MHz. */
	agt_test_helper(has_agt);
}