91dee771fc
On bhyve, the ACPI timer is located at a fixed IO address; it need not be programmed into, nor fetched from, the PMBA -- power management base address -- register of the PCI host bridge. Signed-off-by: Rebecca Cran <rebecca@bsdio.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ard Biesheuvel <ard.biesheuvel@arm.com> Message-Id: <20200430011212.612386-1-rebecca@bsdio.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
33 lines
709 B
C
33 lines
709 B
C
/** @file
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Provide InternalAcpiGetTimerTick for the bhyve instance of the
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Base ACPI Timer Library
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Copyright (C) 2020, Rebecca Cran <rebecca@bsdio.com>
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Copyright (C) 2014, Gabriel L. Somlo <somlo@cmu.edu>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/IoLib.h>
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#include <OvmfPlatforms.h>
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/**
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Internal function to read the current tick counter of ACPI.
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Read the current ACPI tick counter using the counter address cached
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by this instance's constructor.
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@return The tick counter read.
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**/
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UINT32
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InternalAcpiGetTimerTick (
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VOID
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)
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{
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//
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// Return the current ACPI timer value.
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//
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return IoRead32 (BHYVE_ACPI_TIMER_IO_ADDR);
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}
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