28 lines
1.1 KiB
Diff
28 lines
1.1 KiB
Diff
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From a03c1034f6062e69075056c8f31b90e159ce5244 Mon Sep 17 00:00:00 2001
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From: Michael Chang <mchang@suse.com>
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Date: Tue, 1 Dec 2015 18:49:38 +0300
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Subject: [PATCH] i386: fix TSC calibration using PIT
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Condition was accidentally reversed, so PIT calibration always failed
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when PIT was present and always succeeded when PIT was missing, but in
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the latter case resulted in absurdly fast clock.
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Reported and tested by Vitaly Kuznetsov <vkuznets@redhat.com>
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---
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grub-core/kern/i386/tsc_pit.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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Index: grub-2.02~beta2/grub-core/kern/i386/tsc_pit.c
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===================================================================
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--- grub-2.02~beta2.orig/grub-core/kern/i386/tsc_pit.c
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+++ grub-2.02~beta2/grub-core/kern/i386/tsc_pit.c
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@@ -49,7 +49,7 @@ grub_pit_wait (void)
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| GRUB_PIT_SPK_TMR2,
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GRUB_PIT_SPEAKER_PORT);
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- if ((grub_inb (GRUB_PIT_SPEAKER_PORT) & GRUB_PIT_SPK_TMR2_LATCH)) {
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+ if ((grub_inb (GRUB_PIT_SPEAKER_PORT) & GRUB_PIT_SPK_TMR2_LATCH) == 0x00) {
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ret = 1;
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/* Wait. */
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while ((grub_inb (GRUB_PIT_SPEAKER_PORT) & GRUB_PIT_SPK_TMR2_LATCH) == 0x00);
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