File ovmf-aarch64-manage-GICv3-SPI-state-at-the-dist... of Package ovmf.6568

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File ovmf-aarch64-manage-GICv3-SPI-state-at-the-distr.patch of Package ovmf.6568

From 28f8d28faabf50a82ef8d137308592c64ea9e2b6 Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Thu, 7 Jul 2016 19:18:39 +0200
Subject: [PATCH] ArmPkg/ArmGicLib: manage GICv3 SPI state at the distributor

Unlike SGIs and PPIs, which are private to the CPU and are managed at
the redistributor level (which is also a per-CPU construct), shared
interrupts (SPIs) are shared between all CPUs, and therefore managed at
the distributor level (just as on GICv2).

Reported-by: Narinder Dhillon <ndhillonv2@gmail.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
---
 ArmPkg/Drivers/ArmGic/ArmGicLib.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/ArmPkg/Drivers/ArmGic/ArmGicLib.c b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
index 248e896..73795ed 100644
--- a/ArmPkg/Drivers/ArmGic/ArmGicLib.c
+++ b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
@@ -20,6 +20,19 @@
 #include <Library/PcdLib.h>
 
 /**
+ *
+ * Return whether the Source interrupt index refers to a shared interrupt (SPI)
+ */
+STATIC
+BOOLEAN
+SourceIsSpi (
+  IN UINTN  Source
+  )
+{
+  return Source >= 32 && Source < 1020;
+}
+
+/**
  * Return the base address of the GIC redistributor for the current CPU
  *
  * @param Revision  GIC Revision. The GIC redistributor might have a different
@@ -183,7 +196,9 @@ ArmGicEnableInterrupt (
   RegShift = Source % 32;
 
   Revision = ArmGicGetSupportedArchRevision ();
-  if ((Revision == ARM_GIC_ARCH_REVISION_2) || FeaturePcdGet (PcdArmGicV3WithV2Legacy)) {
+  if ((Revision == ARM_GIC_ARCH_REVISION_2) ||
+      FeaturePcdGet (PcdArmGicV3WithV2Legacy) ||
+      SourceIsSpi (Source)) {
     // Write set-enable register
     MmioWrite32 (GicDistributorBase + ARM_GIC_ICDISER + (4 * RegOffset), 1 << RegShift);
   } else {
@@ -216,7 +231,9 @@ ArmGicDisableInterrupt (
   RegShift = Source % 32;
 
   Revision = ArmGicGetSupportedArchRevision ();
-  if ((Revision == ARM_GIC_ARCH_REVISION_2) || FeaturePcdGet (PcdArmGicV3WithV2Legacy)) {
+  if ((Revision == ARM_GIC_ARCH_REVISION_2) ||
+      FeaturePcdGet (PcdArmGicV3WithV2Legacy) ||
+      SourceIsSpi (Source)) {
     // Write clear-enable register
     MmioWrite32 (GicDistributorBase + ARM_GIC_ICDICER + (4 * RegOffset), 1 << RegShift);
   } else {
@@ -249,7 +266,9 @@ ArmGicIsInterruptEnabled (
   RegShift = Source % 32;
 
   Revision = ArmGicGetSupportedArchRevision ();
-  if ((Revision == ARM_GIC_ARCH_REVISION_2) || FeaturePcdGet (PcdArmGicV3WithV2Legacy)) {
+  if ((Revision == ARM_GIC_ARCH_REVISION_2) ||
+      FeaturePcdGet (PcdArmGicV3WithV2Legacy) ||
+      SourceIsSpi (Source)) {
     Interrupts = ((MmioRead32 (GicDistributorBase + ARM_GIC_ICDISER + (4 * RegOffset)) & (1 << RegShift)) != 0);
   } else {
     GicCpuRedistributorBase = GicGetCpuRedistributorBase (GicRedistributorBase, Revision);
-- 
2.10.0

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File ovmf-aarch64-manage-GICv3-SPI-state-at-the-distr.patch of Package ovmf.6568

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