OvmfPkg: AcpiTimerLib: Use global variable during PEI_CORE and PEIM

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 <somlo@cmu.edu>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16377 6f19259b-4bc3-4df7-8a09-765794883524

3 files changed, 30 insertions, 12 deletions

diff --git a/OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.c b/OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.c
index 05b0257451..28280539b6 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",

@@ -74,6 +73,22 @@ 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 35c6edc9a1..43ffc8a6a6 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 2a3016ff07..d5e50aef61 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]