[PATCH 2/2] Platform/SbsaQemu: read GIC base from TF-A

["Marcin Juszkiewicz" <marcin.juszkiewicz@linaro.org>]

Qemu has versioning for sbsa-ref platform. TF-A reads data from provided
DeviceTree and provides as SMC.

This change adds reading GIC base addresses into EDK2.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
---
 .../SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.c | 30 +++++++++++++++++++
 .../SbsaQemuPlatformDxe.inf                   |  4 +++
 2 files changed, 34 insertions(+)

diff --git a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.c b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.c
index 199766c7014a..1213268519c8 100644
--- a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.c
+++ b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.c
@@ -25,6 +25,8 @@
 #define SIP_FUNCTION_ID(n) (SIP_FUNCTION   | (n))
 
 #define SIP_SVC_VERSION  SIP_FUNCTION_ID(1)
+#define SIP_SVC_GET_GICD SIP_FUNCTION_ID(2)
+#define SIP_SVC_GET_GICR SIP_FUNCTION_ID(3)
 
 EFI_STATUS
 EFIAPI
@@ -78,5 +80,33 @@ InitializeSbsaQemuPlatformDxe (
 
   DEBUG ((DEBUG_INFO, "Platform version: %d.%d\n", Arg0, Arg1));
 
+  /* If we are on platform version 0.0 then there is no more data for us in DeviceTree */
+  if ((Arg0 == 0) & (Arg1 == 0))
+  {
+    return EFI_SUCCESS;
+  }
+
+  Result = ArmCallSmc0 (SIP_SVC_GET_GICD, &Arg0, NULL, NULL);
+  if (Result == SMC_ARCH_CALL_SUCCESS)
+  {
+        Result = PcdSet64S (PcdGicDistributorBase, Arg0);
+        ASSERT_EFI_ERROR (Result);
+  }
+
+  Arg0 = PcdGet64 (PcdGicDistributorBase);
+
+  DEBUG ((DEBUG_INFO, "GICD base: 0x%x\n", Arg0));
+
+  Result = ArmCallSmc0 (SIP_SVC_GET_GICR, &Arg0, NULL, NULL);
+  if (Result == SMC_ARCH_CALL_SUCCESS)
+  {
+        Result = PcdSet64S (PcdGicRedistributorsBase, Arg0);
+        ASSERT_EFI_ERROR (Result);
+  }
+
+  Arg0 = PcdGet64 (PcdGicRedistributorsBase);
+
+  DEBUG ((DEBUG_INFO, "GICR base: 0x%x\n", Arg0));
+
   return EFI_SUCCESS;
 }
diff --git a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.inf b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.inf
index 1f2c8a9dd6af..545794a8c7ff 100644
--- a/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.inf
+++ b/Silicon/Qemu/SbsaQemu/Drivers/SbsaQemuPlatformDxe/SbsaQemuPlatformDxe.inf
@@ -41,6 +41,10 @@
   gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdPlatformVersionMajor
   gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdPlatformVersionMinor
 
+  gArmTokenSpaceGuid.PcdGicDistributorBase
+  gArmTokenSpaceGuid.PcdGicRedistributorsBase
+
+
 [Depex]
   TRUE
 
-- 
2.40.1