haiku.git

/*
 * Copyright 2004, Axel Dörfler, axeld@pinc-software.de.
 * Distributed under the terms of the MIT License.
 */


#include <libroot_private.h>
#include <real_time_data.h>
#include <arch_cpu.h>


void
__arch_init_time(struct real_time_data *data, bool setDefaults)
{
	uint32 conversionFactor;
	uint64 conversionFactorNsecs;

	if (setDefaults) {
		data->arch_data.system_time_offset = 0;
		data->arch_data.system_time_conversion_factor = 100000;
	}

	// TODO: this should only store a pointer to that value
	// When resolving this TODO, also resolve the one in the Jamfile.

	conversionFactor = data->arch_data.system_time_conversion_factor;
	conversionFactorNsecs = (uint64)conversionFactor * 1000;

	if (conversionFactorNsecs >> 32 != 0) {
		// the TSC frequency is < 1 GHz, which forces us to shift the factor
		__x86_setup_system_time(conversionFactor, conversionFactorNsecs >> 16,
			true);
	} else {
		// the TSC frequency is >= 1 GHz
		__x86_setup_system_time(conversionFactor, conversionFactorNsecs, false);
	}
}


bigtime_t
__arch_get_system_time_offset(struct real_time_data *data)
{
	//we don't use atomic_get64 because memory is read-only, maybe find another way to lock
	return data->arch_data.system_time_offset;
}