File 0001-grub-core-kern-i386-tsc.c-calibrate_tsc-Ensure-that.patch of Package grub2.2174

From 2e62352bc28bd5d3efafc1b5cbe211ff9e9987fd Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Tue, 20 Jan 2015 21:07:08 +0100
Subject: [PATCH] 	* grub-core/kern/i386/tsc.c (calibrate_tsc): Ensure
 that 	no division by 0 occurs.

---
 ChangeLog                 | 5 +++++
 grub-core/kern/i386/tsc.c | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

Index: grub-2.02~beta2/grub-core/kern/i386/tsc.c
===================================================================
--- grub-2.02~beta2.orig/grub-core/kern/i386/tsc.c
+++ grub-2.02~beta2/grub-core/kern/i386/tsc.c
@@ -122,7 +122,11 @@ calibrate_tsc (void)
   grub_pit_wait (0xffff);
   end_tsc = grub_get_tsc ();
 
-  grub_tsc_rate = grub_divmod64 ((55ULL << 32), end_tsc - tsc_boot_time, 0);
+  grub_tsc_rate = 0;
+  if (end_tsc > tsc_boot_time)
+    grub_tsc_rate = grub_divmod64 ((55ULL << 32), end_tsc - tsc_boot_time, 0);
+  if (grub_tsc_rate == 0)
+    grub_tsc_rate = 5368;/* 800 MHz */
 }
 #endif