[Xen-devel] [PATCH v1 02/21] ArmVirtualizationPkg: add GICv3 detection to VirtFdtDxe

[Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>]

This adds support for detecting the presence of a GICv3 interrupt
controller from the device tree, and recording its distributor
base address in a PCD.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
 .../ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c      | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c 
b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
index 4e4f608923d3..8953f78f5fe4 100644
--- a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
+++ b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
@@ -46,6 +46,7 @@ typedef enum {
   PropertyTypeTimer,
   PropertyTypePsci,
   PropertyTypeFwCfg,
+  PropertyTypeGicV3,
 } PROPERTY_TYPE;
 
 typedef struct {
@@ -62,6 +63,7 @@ STATIC CONST PROPERTY CompatibleProperties[] = {
   { PropertyTypeTimer,   "arm,armv8-timer"     },
   { PropertyTypePsci,    "arm,psci-0.2"        },
   { PropertyTypeFwCfg,   "qemu,fw-cfg-mmio"    },
+  { PropertyTypeGicV3,   "arm,gic-v3"          },
   { PropertyTypeUnknown, ""                    }
 };
 
@@ -256,6 +258,23 @@ InitializeVirtFdtDxe (
       DEBUG ((EFI_D_INFO, "Found GIC @ 0x%Lx/0x%Lx\n", DistBase, CpuBase));
       break;
 
+    case PropertyTypeGicV3:
+      //
+      // The GIC v3 DT binding describes a series of at least 3 physical base
+      // addresses, but we are only interested in the first one, which is the
+      // distributor interface. (We use the system register CPU interface, not
+      // the MMIO one)
+      //
+      ASSERT (Len >= 16);
+
+      DistBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]);
+      ASSERT (DistBase < MAX_UINT32);
+
+      PcdSet32 (PcdGicDistributorBase, (UINT32)DistBase);
+
+      DEBUG ((EFI_D_INFO, "Found GIC v3 distributor @ 0x%Lx\n", DistBase));
+      break;
+
     case PropertyTypeRtc:
       ASSERT (Len == 16);
 
-- 
1.8.3.2


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