ArmPkg: allow dynamic GIC base addresses

Allow the PCDs gArmTokenSpaceGuid.PcdGicDistributorBase and
gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase to be redeclared
as PcdsDynamic by the platform, so virtual machines can set these
properties during boot. As the PcdGet32() calls now call into the
PCD database, cache the values that are required during the handling
of interrupts.

Contributed-under: TianoCore Contribution Agreement 1.0
Acked-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16072 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/ArmPkg.dec

@@ -81,13 +81,6 @@
   gArmTokenSpaceGuid.PcdCpuVectorBaseAddress|0xffff0000|UINT32|0x00000004
   gArmTokenSpaceGuid.PcdCpuResetAddress|0x00000000|UINT32|0x00000005
 
-  #
-  # ARM Generic Interrupt Controller
-  #
-  gArmTokenSpaceGuid.PcdGicDistributorBase|0|UINT32|0x0000000C
-  gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase|0|UINT32|0x0000000D
-  gArmTokenSpaceGuid.PcdGicSgiIntId|0|UINT32|0x00000025
-
   #
   # ARM Secure Firmware PCDs
   #
@@ -216,6 +209,10 @@
   gArmTokenSpaceGuid.PcdArmLinuxFdtAlignment|0x00200000|UINT32|0x00000026
 
 
+#
+# These PCDs are also defined as 'PcdsDynamic' to be redefined when using UEFI in a
+# context of virtual machine.
+#
 [PcdsFixedAtBuild.common, PcdsDynamic.common]
   #
   # ARM Architectural Timer
@@ -227,3 +224,10 @@
   gArmTokenSpaceGuid.PcdArmArchTimerIntrNum|30|UINT32|0x00000036
   gArmTokenSpaceGuid.PcdArmArchTimerHypIntrNum|26|UINT32|0x00000040
   gArmTokenSpaceGuid.PcdArmArchTimerVirtIntrNum|27|UINT32|0x00000041
+
+  #
+  # ARM Generic Interrupt Controller
+  #
+  gArmTokenSpaceGuid.PcdGicDistributorBase|0|UINT32|0x0000000C
+  gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase|0|UINT32|0x0000000D
+  gArmTokenSpaceGuid.PcdGicSgiIntId|0|UINT32|0x00000025

ArmPkg/Drivers/ArmGic/ArmGicDxe.inf

@@ -43,12 +43,13 @@
   MemoryAllocationLib
   UefiDriverEntryPoint
   IoLib
+  PcdLib
 
 [Protocols]
   gHardwareInterruptProtocolGuid
   gEfiCpuArchProtocolGuid
 
-[FixedPcd.common]
+[Pcd.common]
   gArmTokenSpaceGuid.PcdGicDistributorBase
   gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase
 

ArmPkg/Drivers/ArmGic/GicV2/ArmGicV2Dxe.c

@@ -29,6 +29,9 @@ Abstract:
 
 extern EFI_HARDWARE_INTERRUPT_PROTOCOL gHardwareInterruptV2Protocol;
 
+UINT32 mGicInterruptInterfaceBase;
+UINT32 mGicDistributorBase;
+
 /**
   Enable interrupt source Source.
 
@@ -51,7 +54,7 @@ GicV2EnableInterruptSource (
     return EFI_UNSUPPORTED;
   }
 
-  ArmGicEnableInterrupt (FixedPcdGet32 (PcdGicDistributorBase), Source);
+  ArmGicEnableInterrupt (mGicDistributorBase, Source);
 
   return EFI_SUCCESS;
 }
@@ -78,7 +81,7 @@ GicV2DisableInterruptSource (
     return EFI_UNSUPPORTED;
   }
 
-  ArmGicDisableInterrupt (FixedPcdGet32 (PcdGicDistributorBase), Source);
+  ArmGicDisableInterrupt (mGicDistributorBase, Source);
 
   return EFI_SUCCESS;
 }
@@ -107,7 +110,7 @@ GicV2GetInterruptSourceState (
     return EFI_UNSUPPORTED;
   }
 
-  *InterruptState = ArmGicIsInterruptEnabled (FixedPcdGet32 (PcdGicDistributorBase), Source);
+  *InterruptState = ArmGicIsInterruptEnabled (mGicDistributorBase, Source);
 
   return EFI_SUCCESS;
 }
@@ -135,7 +138,7 @@ GicV2EndOfInterrupt (
     return EFI_UNSUPPORTED;
   }
 
-  ArmGicV2EndOfInterrupt (FixedPcdGet32 (PcdGicInterruptInterfaceBase), Source);
+  ArmGicV2EndOfInterrupt (mGicInterruptInterfaceBase, Source);
   return EFI_SUCCESS;
 }
 
@@ -160,7 +163,7 @@ GicV2IrqInterruptHandler (
   UINT32                      GicInterrupt;
   HARDWARE_INTERRUPT_HANDLER  InterruptHandler;
 
-  GicInterrupt = ArmGicV2AcknowledgeInterrupt (FixedPcdGet32 (PcdGicInterruptInterfaceBase));
+  GicInterrupt = ArmGicV2AcknowledgeInterrupt (mGicInterruptInterfaceBase);
 
   // Special Interrupts (ID1020-ID1023) have an Interrupt ID greater than the number of interrupt (ie: Spurious interrupt).
   if ((GicInterrupt & ARM_GIC_ICCIAR_ACKINTID) >= mGicNumInterrupts) {
@@ -216,7 +219,7 @@ GicV2ExitBootServicesEvent (
 
   // Acknowledge all pending interrupts
   do {
-    GicInterrupt = ArmGicV2AcknowledgeInterrupt (FixedPcdGet32 (PcdGicInterruptInterfaceBase));
+    GicInterrupt = ArmGicV2AcknowledgeInterrupt (mGicInterruptInterfaceBase);
 
     if ((GicInterrupt & ARM_GIC_ICCIAR_ACKINTID) < mGicNumInterrupts) {
       GicV2EndOfInterrupt (&gHardwareInterruptV2Protocol, GicInterrupt);
@@ -224,10 +227,10 @@ GicV2ExitBootServicesEvent (
   } while (!ARM_GIC_IS_SPECIAL_INTERRUPTS (GicInterrupt));
 
   // Disable Gic Interface
-  ArmGicV2DisableInterruptInterface (FixedPcdGet32 (PcdGicInterruptInterfaceBase));
+  ArmGicV2DisableInterruptInterface (mGicInterruptInterfaceBase);
 
   // Disable Gic Distributor
-  ArmGicDisableDistributor (FixedPcdGet32 (PcdGicDistributorBase));
+  ArmGicDisableDistributor (mGicDistributorBase);
 }
 
 /**
@@ -256,7 +259,9 @@ GicV2DxeInitialize (
   // Make sure the Interrupt Controller Protocol is not already installed in the system.
   ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gHardwareInterruptProtocolGuid);
 
-  mGicNumInterrupts = ArmGicGetMaxNumInterrupts (FixedPcdGet32 (PcdGicDistributorBase));
+  mGicInterruptInterfaceBase = PcdGet32 (PcdGicInterruptInterfaceBase);
+  mGicDistributorBase = PcdGet32 (PcdGicDistributorBase);
+  mGicNumInterrupts = ArmGicGetMaxNumInterrupts (mGicDistributorBase);
 
   for (Index = 0; Index < mGicNumInterrupts; Index++) {
     GicV2DisableInterruptSource (&gHardwareInterruptV2Protocol, Index);
@@ -265,7 +270,7 @@ GicV2DxeInitialize (
     RegOffset = Index / 4;
     RegShift = (Index % 4) * 8;
     MmioAndThenOr32 (
-      FixedPcdGet32 (PcdGicDistributorBase) + ARM_GIC_ICDIPR + (4 * RegOffset),
+      mGicDistributorBase + ARM_GIC_ICDIPR + (4 * RegOffset),
       ~(0xff << RegShift),
       ARM_GIC_DEFAULT_PRIORITY << RegShift
       );
@@ -282,28 +287,28 @@ GicV2DxeInitialize (
   //
   // Read the first Interrupt Processor Targets Register (that corresponds to the 4
   // first SGIs)
-  CpuTarget = MmioRead32 (FixedPcdGet32 (PcdGicDistributorBase) + ARM_GIC_ICDIPTR);
+  CpuTarget = MmioRead32 (mGicDistributorBase + ARM_GIC_ICDIPTR);
 
   // The CPU target is a bit field mapping each CPU to a GIC CPU Interface. This value
   // is 0 when we run on a uniprocessor platform.
   if (CpuTarget != 0) {
     // The 8 first Interrupt Processor Targets Registers are read-only
     for (Index = 8; Index < (mGicNumInterrupts / 4); Index++) {
-      MmioWrite32 (FixedPcdGet32 (PcdGicDistributorBase) + ARM_GIC_ICDIPTR + (Index * 4), CpuTarget);
+      MmioWrite32 (mGicDistributorBase + ARM_GIC_ICDIPTR + (Index * 4), CpuTarget);
     }
   }
 
   // Set binary point reg to 0x7 (no preemption)
-  MmioWrite32 (FixedPcdGet32 (PcdGicInterruptInterfaceBase) + ARM_GIC_ICCBPR, 0x7);
+  MmioWrite32 (mGicInterruptInterfaceBase + ARM_GIC_ICCBPR, 0x7);
 
   // Set priority mask reg to 0xff to allow all priorities through
-  MmioWrite32 (FixedPcdGet32 (PcdGicInterruptInterfaceBase) + ARM_GIC_ICCPMR, 0xff);
+  MmioWrite32 (mGicInterruptInterfaceBase + ARM_GIC_ICCPMR, 0xff);
 
   // Enable gic cpu interface
-  ArmGicEnableInterruptInterface (FixedPcdGet32 (PcdGicInterruptInterfaceBase));
+  ArmGicEnableInterruptInterface (mGicInterruptInterfaceBase);
 
   // Enable gic distributor
-  ArmGicEnableDistributor (FixedPcdGet32 (PcdGicDistributorBase));
+  ArmGicEnableDistributor (mGicDistributorBase);
 
   Status = InstallAndRegisterInterruptService (
           &gHardwareInterruptV2Protocol, GicV2IrqInterruptHandler, GicV2ExitBootServicesEvent);

ArmPkg/Library/BdsLib/BdsLib.inf

@@ -48,6 +48,7 @@
   DebugLib
   DevicePathLib
   HobLib
+  PcdLib
   PerformanceLib
   SerialPortLib
   FdtLib
@@ -91,7 +92,7 @@
 [FixedPcd.ARM]
   gArmTokenSpaceGuid.PcdArmLinuxAtagMaxOffset
 
-[FixedPcd.AARCH64]
+[Pcd.AARCH64]
   gArmTokenSpaceGuid.PcdGicDistributorBase
   gArmTokenSpaceGuid.PcdGicSgiIntId