Since in OVMF both PEI_CORE and PEIM run from RAM, and thus may
utilize global variables, use the "Base" AcpiTimerLib instance
(instead of BaseRom) to take advantage of the improved efficiency
of storing the timer register IO address in a global variable.
This leaves only SEC using the BaseRomAcpiTimerLib instance.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gabriel Somlo <so...@cmu.edu>
---
OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.c | 35 +++++++++++++++-------
OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.inf | 5 +++-
.../Library/AcpiTimerLib/BaseRomAcpiTimerLib.inf | 2 +-
OvmfPkg/OvmfPkgIa32.dsc | 2 --
OvmfPkg/OvmfPkgIa32X64.dsc | 2 --
OvmfPkg/OvmfPkgX64.dsc | 2 --
6 files changed, 30 insertions(+), 18 deletions(-)
diff --git a/OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.c
b/OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.c
index 8612ace..2faf3be 100644
--- a/OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.c
+++ b/OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.c
@@ -15,12 +15,14 @@
#include <Library/DebugLib.h>
#include <Library/IoLib.h>
#include <Library/PciLib.h>
+#include <Library/PcdLib.h>
#include <OvmfPlatforms.h>
//
// Power Management PCI Configuration Register fields
//
#define PMBA_RTE BIT0
+#define PMIOSE BIT0
//
// Offset in the Power Management Base Address to the ACPI Timer
@@ -33,14 +35,8 @@
STATIC UINT32 mAcpiTimerIoAddr;
/**
- The constructor function caches the ACPI tick counter address
-
- At the time this constructor runs (DXE_CORE or later), ACPI IO space
- has already been enabled by either PlatformPei or by the "Base"
- instance of this library.
- In order to avoid querying the underlying platform type during each
- tick counter read operation, we cache the counter address during
- initialization of this instance of the Timer Library.
+ The constructor function caches the ACPI tick counter address, and,
+ if necessary, enables ACPI IO space.
@retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.
@@ -53,6 +49,7 @@ AcpiTimerLibConstructor (
{
UINT16 HostBridgeDevId;
UINTN Pmba;
+ UINTN PmRegMisc;
//
// Query Host Bridge DID to determine platform type
@@ -60,10 +57,12 @@ AcpiTimerLibConstructor (
HostBridgeDevId = PciRead16 (OVMF_HOSTBRIDGE_DID);
switch (HostBridgeDevId) {
case INTEL_82441_DEVICE_ID:
- Pmba = POWER_MGMT_REGISTER_PIIX4 (0x40);
+ Pmba = POWER_MGMT_REGISTER_PIIX4 (0x40);
+ PmRegMisc = POWER_MGMT_REGISTER_PIIX4 (0x80);
break;
case INTEL_Q35_MCH_DEVICE_ID:
- Pmba = POWER_MGMT_REGISTER_Q35 (0x40);
+ Pmba = POWER_MGMT_REGISTER_Q35 (0x40);
+ PmRegMisc = POWER_MGMT_REGISTER_Q35 (0x80);
break;
default:
DEBUG ((EFI_D_ERROR, "%a: Unknown Host Bridge Device ID: 0x%04x\n",
@@ -73,6 +72,22 @@ AcpiTimerLibConstructor (
mAcpiTimerIoAddr = (PciRead32 (Pmba) & ~PMBA_RTE) + ACPI_TIMER_OFFSET;
+ //
+ // Check to see if the Power Management Base Address is already enabled
+ //
+ if ((PciRead8 (PmRegMisc) & PMIOSE) == 0) {
+ //
+ // If the Power Management Base Address is not programmed,
+ // then program the Power Management Base Address from a PCD.
+ //
+ PciAndThenOr32 (Pmba, (UINT32) ~0xFFC0, PcdGet16 (PcdAcpiPmBaseAddress));
+
+ //
+ // Enable PMBA I/O port decodes in PMREGMISC
+ //
+ PciOr8 (PmRegMisc, PMIOSE);
+ }
+
return RETURN_SUCCESS;
}
diff --git a/OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.inf
b/OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.inf
index 35c6edc..43ffc8a 100644
--- a/OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.inf
+++ b/OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.inf
@@ -20,7 +20,7 @@
FILE_GUID = FB648CF5-91BE-4737-9023-FD807AC6D96D
MODULE_TYPE = BASE
VERSION_STRING = 1.0
- LIBRARY_CLASS = TimerLib|DXE_CORE DXE_SMM_DRIVER UEFI_DRIVER
UEFI_APPLICATION SMM_CORE
+ LIBRARY_CLASS = TimerLib|PEI_CORE PEIM DXE_CORE DXE_SMM_DRIVER UEFI_DRIVER
UEFI_APPLICATION SMM_CORE
CONSTRUCTOR = AcpiTimerLibConstructor
[Sources]
@@ -31,6 +31,9 @@
MdePkg/MdePkg.dec
OvmfPkg/OvmfPkg.dec
+[Pcd]
+ gUefiOvmfPkgTokenSpaceGuid.PcdAcpiPmBaseAddress
+
[LibraryClasses]
BaseLib
PciLib
diff --git a/OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.inf
b/OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.inf
index 2a3016f..d5e50ae 100644
--- a/OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.inf
+++ b/OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.inf
@@ -19,7 +19,7 @@
FILE_GUID = CDD9D74F-213E-4c28-98F7-8B4A167DB936
MODULE_TYPE = BASE
VERSION_STRING = 1.0
- LIBRARY_CLASS = TimerLib|SEC PEI_CORE PEIM
+ LIBRARY_CLASS = TimerLib|SEC
CONSTRUCTOR = AcpiTimerLibConstructor
[Sources]
diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index 5baec1c..cd7e252 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -150,7 +150,6 @@
CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf
[LibraryClasses.common.PEI_CORE]
- TimerLib|OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.inf
HobLib|MdePkg/Library/PeiHobLib/PeiHobLib.inf
PeiServicesTablePointerLib|MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointerLibIdt.inf
PeiServicesLib|MdePkg/Library/PeiServicesLib/PeiServicesLib.inf
@@ -167,7 +166,6 @@
PeCoffLib|MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf
[LibraryClasses.common.PEIM]
- TimerLib|OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.inf
HobLib|MdePkg/Library/PeiHobLib/PeiHobLib.inf
PeiServicesTablePointerLib|MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointerLibIdt.inf
PeiServicesLib|MdePkg/Library/PeiServicesLib/PeiServicesLib.inf
diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
index c7a18d0..16f988b 100644
--- a/OvmfPkg/OvmfPkgIa32X64.dsc
+++ b/OvmfPkg/OvmfPkgIa32X64.dsc
@@ -155,7 +155,6 @@
CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf
[LibraryClasses.common.PEI_CORE]
- TimerLib|OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.inf
HobLib|MdePkg/Library/PeiHobLib/PeiHobLib.inf
PeiServicesTablePointerLib|MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointerLibIdt.inf
PeiServicesLib|MdePkg/Library/PeiServicesLib/PeiServicesLib.inf
@@ -172,7 +171,6 @@
PeCoffLib|MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf
[LibraryClasses.common.PEIM]
- TimerLib|OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.inf
HobLib|MdePkg/Library/PeiHobLib/PeiHobLib.inf
PeiServicesTablePointerLib|MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointerLibIdt.inf
PeiServicesLib|MdePkg/Library/PeiServicesLib/PeiServicesLib.inf
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 7cafcac..b70985b 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -155,7 +155,6 @@
CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf
[LibraryClasses.common.PEI_CORE]
- TimerLib|OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.inf
HobLib|MdePkg/Library/PeiHobLib/PeiHobLib.inf
PeiServicesTablePointerLib|MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointerLibIdt.inf
PeiServicesLib|MdePkg/Library/PeiServicesLib/PeiServicesLib.inf
@@ -172,7 +171,6 @@
PeCoffLib|MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf
[LibraryClasses.common.PEIM]
- TimerLib|OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.inf
HobLib|MdePkg/Library/PeiHobLib/PeiHobLib.inf
PeiServicesTablePointerLib|MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointerLibIdt.inf
PeiServicesLib|MdePkg/Library/PeiServicesLib/PeiServicesLib.inf
--
1.9.3
------------------------------------------------------------------------------
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