kernel: Add support and interface for cpufreq modules

headers/os/drivers/cpufreq.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2013, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _CPUFREQ_H
+#define _CPUFREQ_H
+
+
+#include <module.h>
+
+
+#define CPUFREQ_MODULES_PREFIX	"power/cpufreq"
+
+
+const int kCPUPerformanceScaleMax = 1000;
+
+typedef struct cpufreq_module_info {
+	module_info		info;
+
+	status_t		(*increase_performance)(int delta, bool allowBoost);
+	status_t		(*decrease_performance)(int delta);
+} cpufreq_module_info;
+
+
+#endif	// _CPUFREQ_H
+

headers/private/kernel/cpu.h

@@ -104,6 +104,9 @@ extern inline cpu_ent *get_cpu_struct(void) { return &gCPU[smp_get_current_cpu()
 status_t cpu_build_topology_tree(void);
 cpu_topology_node* get_cpu_topology(void);
 
+status_t increase_cpu_performance(int delta, bool allowBoost);
+status_t decrease_cpu_performance(int delta);
+
 void _user_clear_caches(void *address, size_t length, uint32 flags);
 bool _user_cpu_enabled(int32 cpu);
 status_t _user_set_cpu_enabled(int32 cpu, bool enabled);