idle: introduce cpuidle generic module

This module will load the various lowlevel cpuidle modules' implementations during initialiation. If it finds one available module, it will change the global gCpuIdleFunc as its own better one. When idle, cpuidle module will select the best cstate and enter it by calling the lowlevel module's implementation. Signed-off-by: Yongcong Du <[email protected]> Signed-off-by: Fredrik Holmqvist <[email protected]>
2012-11-18 17:39:17 +01:00
parent 8a6451b9fd
commit 2195811a84
4 changed files with 180 additions and 0 deletions
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2012, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _CPUIDLE_MODULE_H
+#define _CPUIDLE_MODULE_H
+
+
+#include <module.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define CPUIDLE_CSTATE_MAX	8
+#define CSTATE_NAME_LENGTH	32
+#define B_CPUIDLE_MODULE_NAME "idle/generic/cpuidle/v1"
+
+
+struct CpuidleStats {
+	uint64		usageCount;
+	bigtime_t	usageTime;
+};
+
+
+struct CpuidleInfo {
+	int32			cstateSleep;
+	CpuidleStats	stats[CPUIDLE_CSTATE_MAX];
+};
+
+
+struct CpuidleCstate {
+	char	name[CSTATE_NAME_LENGTH];
+	int32	latency;
+	int32	(*EnterIdle)(int32 state, CpuidleCstate *cstate);
+	void	*pData;
+};
+
+
+struct CpuidleModuleInfo {
+	module_info		info;
+	CpuidleCstate	cStates[CPUIDLE_CSTATE_MAX];
+	int32			cStateCount;
+};
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif		// _CPUIDLE_MODULE_H