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+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_POWER_ACPI_CPUFREQ_H
+#define _RTE_POWER_ACPI_CPUFREQ_H
+
+/**
+ * @file
+ * RTE Power Management via userspace ACPI cpufreq
+ */
+
+#include <rte_common.h>
+#include <rte_byteorder.h>
+#include <rte_log.h>
+#include <rte_string_fns.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Initialize power management for a specific lcore. It will check and set the
+ * governor to userspace for the lcore, get the available frequencies, and
+ * prepare to set new lcore frequency.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_init(unsigned lcore_id);
+
+/**
+ * Exit power management on a specific lcore. It will set the governor to which
+ * is before initialized.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_exit(unsigned lcore_id);
+
+/**
+ * Get the available frequencies of a specific lcore. The return value will be
+ * the minimal one of the total number of available frequencies and the number
+ * of buffer. The index of available frequencies used in other interfaces
+ * should be in the range of 0 to this return value.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ * @param freqs
+ * The buffer array to save the frequencies.
+ * @param num
+ * The number of frequencies to get.
+ *
+ * @return
+ * The number of available frequencies.
+ */
+uint32_t rte_power_acpi_cpufreq_freqs(unsigned lcore_id, uint32_t *freqs,
+ uint32_t num);
+
+/**
+ * Return the current index of available frequencies of a specific lcore. It
+ * will return 'RTE_POWER_INVALID_FREQ_INDEX = (~0)' if error.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * The current index of available frequencies.
+ */
+uint32_t rte_power_acpi_cpufreq_get_freq(unsigned lcore_id);
+
+/**
+ * Set the new frequency for a specific lcore by indicating the index of
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ * @param index
+ * The index of available frequencies.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_set_freq(unsigned lcore_id, uint32_t index);
+
+/**
+ * Scale up the frequency of a specific lcore according to the available
+ * frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_freq_up(unsigned lcore_id);
+
+/**
+ * Scale down the frequency of a specific lcore according to the available
+ * frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_freq_down(unsigned lcore_id);
+
+/**
+ * Scale up the frequency of a specific lcore to the highest according to the
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_freq_max(unsigned lcore_id);
+
+/**
+ * Scale down the frequency of a specific lcore to the lowest according to the
+ * available frequencies.
+ * It should be protected outside of this function for threadsafe.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency chnaged.
+ * - Negative on error.
+ */
+int rte_power_acpi_cpufreq_freq_min(unsigned lcore_id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif