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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Laszlo Ersek <lersek@redhat.com>
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Date: Fri, 10 Oct 2014 11:11:09 +0200
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Subject: [PATCH] calibrate_tsc(): use the Stall() EFI boot service on
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GRUB_MACHINE_EFI
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1150698
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HyperV Gen2 virtual machines have no PIT; guest code should rely on UEFI
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services instead.
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Signed-off-by: RHEL Ninjas <example@example.com>
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---
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grub-core/kern/i386/tsc.c | 20 ++++++++++++++++----
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1 file changed, 16 insertions(+), 4 deletions(-)
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diff --git a/grub-core/kern/i386/tsc.c b/grub-core/kern/i386/tsc.c
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index 3a4cae601d0..e49964833ca 100644
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--- a/grub-core/kern/i386/tsc.c
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+++ b/grub-core/kern/i386/tsc.c
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@@ -26,9 +26,14 @@
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#include <grub/i386/tsc.h>
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#include <grub/i386/cpuid.h>
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#ifdef GRUB_MACHINE_XEN
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-#include <grub/xen.h>
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+# include <grub/xen.h>
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#else
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-#include <grub/i386/pit.h>
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+# ifdef GRUB_MACHINE_EFI
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+# include <grub/efi/efi.h>
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+# include <grub/efi/api.h>
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+# else
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+# include <grub/i386/pit.h>
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+# endif
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#endif
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#include <grub/cpu/io.h>
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@@ -72,8 +77,14 @@ grub_cpu_is_tsc_supported (void)
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#ifndef GRUB_MACHINE_XEN
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static void
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-grub_pit_wait (grub_uint16_t tics)
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+grub_stall (grub_uint16_t tics)
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{
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+# ifdef GRUB_MACHINE_EFI
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+ grub_uint64_t microseconds;
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+
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+ microseconds = (grub_uint64_t)tics * 1000 * 1000 * 3 / 3579545;
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+ efi_call_1 (grub_efi_system_table->boot_services->stall, microseconds);
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+# else
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/* Disable timer2 gate and speaker. */
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grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
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& ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
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@@ -97,6 +108,7 @@ grub_pit_wait (grub_uint16_t tics)
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grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
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& ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
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GRUB_PIT_SPEAKER_PORT);
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+# endif
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}
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#endif
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@@ -119,7 +131,7 @@ calibrate_tsc (void)
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grub_uint64_t end_tsc;
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tsc_boot_time = grub_get_tsc ();
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- grub_pit_wait (0xffff);
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+ grub_stall (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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