1 files changed, 82 insertions, 0 deletions
diff --git a/sys/kern/kern_pmc.c b/sys/kern/kern_pmc.c
new file mode 100644
index 0000000..29be9c1
--- /dev/null
+++ b/sys/kern/kern_pmc.c
@@ -0,0 +1,82 @@
+/*-
+ * Copyright (c) 2003 Joseph Koshy
+ *
+ * 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 AUTHORS 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 AUTHORS 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.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#ifdef HWPMC_HOOKS
+
+#include <sys/pmckern.h>
+#include <sys/smp.h>
+
+struct sx pmc_sx;
+
+/* Hook variable. */
+int (*pmc_hook)(struct thread *td, int function, void *arg) = NULL;
+
+/* Interrupt handler */
+int (*pmc_intr)(int cpu, uintptr_t pc) = NULL;
+
+/*
+ * Since PMC(4) may not be loaded in the current kernel, the
+ * convention followed is that a non-NULL value of 'pmc_hook' implies
+ * the presence of this kernel module.
+ *
+ * This requires us to protect 'pmc_hook' with a
+ * shared (sx) lock -- thus making the process of calling into PMC(4)
+ * somewhat more expensive than a simple 'if' check and indirect call.
+ */
+
+
+SX_SYSINIT(pmc, &pmc_sx, "pmc shared lock");
+
+/*
+ * pmc_cpu_is_disabled
+ *
+ * return TRUE if the cpu specified has been disabled.
+ */
+
+int
+pmc_cpu_is_disabled(int cpu)
+{
+#ifdef	SMP
+	return ((hlt_cpus_mask & (1 << cpu)) != 0);
+#else
+	return 0;
+#endif
+}
+
+int
+pmc_cpu_is_logical(int cpu)
+{
+#ifdef	SMP
+	return ((logical_cpus_mask & (1 << cpu)) != 0);
+#else
+	return 0;
+#endif
+}
+
+#endif /* HWPMC_HOOKS */