--- /dev/null
+/*-
+ * 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_H
+#define _RTE_POWER_H
+
+/**
+ * @file
+ * RTE Power Management
+ */
+
+#include <rte_common.h>
+#include <rte_byteorder.h>
+#include <rte_log.h>
+#include <rte_string_fns.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Power Management Environment State */
+enum power_management_env {PM_ENV_NOT_SET, PM_ENV_ACPI_CPUFREQ, PM_ENV_KVM_VM};
+
+/**
+ * Set the default power management implementation. If this is not called prior
+ * to rte_power_init(), then auto-detect of the environment will take place.
+ * It is not thread safe.
+ *
+ * @param env
+ * env. The environment in which to initialise Power Management for.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int rte_power_set_env(enum power_management_env env);
+
+/**
+ * Unset the global environment configuration.
+ * This can only be called after all threads have completed.
+ */
+void rte_power_unset_env(void);
+
+/**
+ * Get the default power management implementation.
+ *
+ * @return
+ * power_management_env The configured environment.
+ */
+enum power_management_env rte_power_get_env(void);
+
+/**
+ * Initialize power management for a specific lcore. If rte_power_set_env() has
+ * not been called then an auto-detect of the environment will start and
+ * initialise the corresponding resources.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int rte_power_init(unsigned lcore_id);
+
+/**
+ * Exit power management on a specific lcore. This will call the environment
+ * dependent exit function.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 0 on success.
+ * - Negative on error.
+ */
+int rte_power_exit(unsigned lcore_id);
+
+/**
+ * Get the available frequencies of a specific lcore.
+ * Function pointer definition. Review each environments
+ * specific documentation for usage.
+ *
+ * @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.
+ */
+typedef uint32_t (*rte_power_freqs_t)(unsigned lcore_id, uint32_t *freqs,
+ uint32_t num);
+
+extern rte_power_freqs_t rte_power_freqs;
+
+/**
+ * Return the current index of available frequencies of a specific lcore.
+ * Function pointer definition. Review each environments
+ * specific documentation for usage.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * The current index of available frequencies.
+ */
+typedef uint32_t (*rte_power_get_freq_t)(unsigned lcore_id);
+
+extern rte_power_get_freq_t rte_power_get_freq;
+
+/**
+ * Set the new frequency for a specific lcore by indicating the index of
+ * available frequencies.
+ * Function pointer definition. Review each environments
+ * specific documentation for usage.
+ *
+ * @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.
+ */
+typedef int (*rte_power_set_freq_t)(unsigned lcore_id, uint32_t index);
+
+extern rte_power_set_freq_t rte_power_set_freq;
+
+/**
+ * Function pointer definition for generic frequency change functions. Review
+ * each environments specific documentation for usage.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+typedef int (*rte_power_freq_change_t)(unsigned lcore_id);
+
+/**
+ * Scale up the frequency of a specific lcore according to the available
+ * frequencies.
+ * Review each environments specific documentation for usage.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+extern rte_power_freq_change_t rte_power_freq_up;
+
+/**
+ * Scale down the frequency of a specific lcore according to the available
+ * frequencies.
+ * Review each environments specific documentation for usage.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+
+extern rte_power_freq_change_t rte_power_freq_down;
+
+/**
+ * Scale up the frequency of a specific lcore to the highest according to the
+ * available frequencies.
+ * Review each environments specific documentation for usage.
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+extern rte_power_freq_change_t rte_power_freq_max;
+
+/**
+ * Scale down the frequency of a specific lcore to the lowest according to the
+ * available frequencies.
+ * Review each environments specific documentation for usage..
+ *
+ * @param lcore_id
+ * lcore id.
+ *
+ * @return
+ * - 1 on success with frequency changed.
+ * - 0 on success without frequency changed.
+ * - Negative on error.
+ */
+extern rte_power_freq_change_t rte_power_freq_min;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
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