1 files changed, 93 insertions, 0 deletions
diff --git a/sys/sys/pmckern.h b/sys/sys/pmckern.h
new file mode 100644
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--- /dev/null
+++ b/sys/sys/pmckern.h
@@ -0,0 +1,93 @@
+/*-
+ * Copyright (c) 2003, Joseph Koshy
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * PMC interface used by the base kernel.
+ */
+
+#ifndef _SYS_PMCKERN_H_
+#define _SYS_PMCKERN_H_
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/proc.h>
+#include <sys/sx.h>
+
+#define	PMC_FN_PROCESS_EXIT		1
+#define	PMC_FN_PROCESS_EXEC		2
+#define	PMC_FN_PROCESS_FORK		3
+#define	PMC_FN_CSW_IN			4
+#define	PMC_FN_CSW_OUT			5
+
+/* hook */
+extern int (*pmc_hook)(struct thread *_td, int _function, void *_arg);
+extern int (*pmc_intr)(int cpu, uintptr_t pc);
+
+/* SX lock protecting the hook */
+extern struct sx pmc_sx;
+
+/* hook invocation; for use within the kernel */
+#define	PMC_CALL_HOOK(t, cmd, arg)		\
+do {						\
+	sx_slock(&pmc_sx);			\
+	if (pmc_hook != NULL)			\
+		(pmc_hook)((t), (cmd), (arg));	\
+	sx_sunlock(&pmc_sx);			\
+} while (0)
+
+/* hook invocation that needs an exclusive lock */
+#define	PMC_CALL_HOOK_X(t, cmd, arg)		\
+do {						\
+	sx_xlock(&pmc_sx);			\
+	if (pmc_hook != NULL)			\
+		(pmc_hook)((t), (cmd), (arg));	\
+	sx_xunlock(&pmc_sx);			\
+} while (0)
+
+/* context switches cannot take locks */
+#define	PMC_SWITCH_CONTEXT(t, cmd)		\
+do {						\
+	if (pmc_hook != NULL)			\
+		(pmc_hook)((t), (cmd), NULL);	\
+} while (0)
+
+
+/*
+ * check if a process is using HWPMCs.
+ */
+
+#define PMC_PROC_IS_USING_PMCS(p)				\
+	(__predict_false(atomic_load_acq_int(&(p)->p_flag) &	\
+	    P_HWPMC))
+
+/* helper functions */
+int	pmc_cpu_is_disabled(int _cpu);
+int	pmc_cpu_is_logical(int _cpu);
+
+#endif /* _SYS_PMCKERN_H_ */