forked from pool/grub2
29 lines
995 B
Diff
29 lines
995 B
Diff
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From 2e62352bc28bd5d3efafc1b5cbe211ff9e9987fd Mon Sep 17 00:00:00 2001
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From: Vladimir Serbinenko <phcoder@gmail.com>
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Date: Tue, 20 Jan 2015 21:07:08 +0100
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Subject: [PATCH] * grub-core/kern/i386/tsc.c (calibrate_tsc): Ensure
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that no division by 0 occurs.
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---
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ChangeLog | 5 +++++
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grub-core/kern/i386/tsc.c | 6 +++++-
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2 files changed, 10 insertions(+), 1 deletion(-)
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Index: grub-2.02~beta2/grub-core/kern/i386/tsc.c
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===================================================================
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--- grub-2.02~beta2.orig/grub-core/kern/i386/tsc.c
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+++ grub-2.02~beta2/grub-core/kern/i386/tsc.c
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@@ -122,7 +122,11 @@ calibrate_tsc (void)
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grub_pit_wait (0xffff);
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end_tsc = grub_get_tsc ();
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- grub_tsc_rate = grub_divmod64 ((55ULL << 32), end_tsc - tsc_boot_time, 0);
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+ grub_tsc_rate = 0;
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+ if (end_tsc > tsc_boot_time)
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+ grub_tsc_rate = grub_divmod64 ((55ULL << 32), end_tsc - tsc_boot_time, 0);
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+ if (grub_tsc_rate == 0)
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+ grub_tsc_rate = 5368;/* 800 MHz */
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}
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#endif
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