Split pmtimer wait and tsc measurement from pmtimer tsc calibration.

include/grub/i386/pmtimer.h

@@ -0,0 +1,37 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2008,2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KERNEL_CPU_PMTIMER_HEADER
+#define KERNEL_CPU_PMTIMER_HEADER   1
+
+#include <grub/i386/tsc.h>
+#include <grub/i386/io.h>
+
+/*
+  Preconditions:
+  * Caller has ensured that both pmtimer and tsc are supported
+  * 1 <= num_pm_ticks <= 3580
+  Return:
+  * Number of TSC ticks elapsed
+  * 0 on failure.
+*/
+grub_uint64_t
+EXPORT_FUNC(grub_pmtimer_wait_count_tsc) (grub_port_t pmtimer,
+					  grub_uint16_t num_pm_ticks);
+
+#endif