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OvmfPkg/Library/AcpiTimerLib: Modified to support Xen HVM 

If PIIX4 Power Management Base Address (PMBA) is already
programmed, then read and use it's current setting.

Signed-off-by: Andrei Warkentin <andreiw@motorola.com>
Reviewed-by: gavinguan
Signed-off-by: jljusten

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12053 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
jljusten 2011-07-27 15:13:54 +00:00
parent 3397c6f590
commit 550486ed3b
1 changed files with 24 additions and 5 deletions
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29
OvmfPkg/Library/AcpiTimerLib/AcpiTimerLib.c
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@ -1,7 +1,9 @@
/** @file
ACPI Timer implements one instance of Timer Library.
Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2008 - 2011, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2011, Andrei Warkentin <andreiw@motorola.com>
This program and the accompanying materials are
licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -17,9 +19,17 @@
#include <Library/BaseLib.h>
#include <Library/IoLib.h>
#include <Library/PciLib.h>
#include <Library/DebugLib.h>
//
// PIIX4 Power Management Base Address
//
UINT32 mPmba = 0x401;
#define PCI_BAR_IO 0x1
#define ACPI_TIMER_FREQUENCY 3579545
#define ACPI_TIMER_COUNT_SIZE 0x01000000
#define ACPI_TIMER_OFFSET 0x8
/**
The constructor function enables ACPI IO space.
@ -41,12 +51,21 @@ AcpiTimerLibConstructor (
Device = 1;
// Device = 7;
if (PciRead8 (PCI_LIB_ADDRESS (0,Device,3,0x80)) & 1) {
mPmba = PciRead32 (PCI_LIB_ADDRESS (0,Device,3,0x40));
ASSERT (mPmba & PCI_BAR_IO);
mPmba &= ~PCI_BAR_IO;
} else {
PciAndThenOr32 (PCI_LIB_ADDRESS (0,Device,3,0x40),
(UINT32) ~0xfc0, mPmba);
PciOr8 (PCI_LIB_ADDRESS (0,Device,3,0x04), 0x01);
}
//
// ACPI Timer enable is in Bus 0, Device ?, Function 3
//
PciOr8 (PCI_LIB_ADDRESS (0,Device,3,0x04), 0x01);
PciAndThenOr32 (PCI_LIB_ADDRESS (0,Device,3,0x40), (UINT32) ~0xfc0, 0x400);
PciOr8 (PCI_LIB_ADDRESS (0,Device,3,0x80), 0x01); return RETURN_SUCCESS;
PciOr8 (PCI_LIB_ADDRESS (0,Device,3,0x80), 0x01);
return RETURN_SUCCESS;
}
/**
@ -63,7 +82,7 @@ InternalAcpiGetTimerTick (
VOID
)
{
return IoRead32 (0x408);
return IoRead32 (mPmba + ACPI_TIMER_OFFSET);
}
/**