[Xen-devel] [PATCH v2 28/29] ArmVirtualizationPkg/VirtFdtDxe: wire up XenBusDxe to "xen, xen" DT node

[Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>]

This patchs adds support to VirtFdtDxe for the Xen DT node which
contains the base address of the Grant Table. This data is communicated
to XenBusDxe using a XENIO_PROTOCOL instance.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
 ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c   | 23 
+++++++++++++++++++++++
 ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf |  1 +
 2 files changed, 24 insertions(+)

diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c 
b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
index 34fac40fa803..1ceb85146430 100644
--- a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
+++ b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
@@ -26,6 +26,7 @@
 #include <Library/DxeServicesLib.h>
 #include <Library/HobLib.h>
 #include <libfdt.h>
+#include <Library/XenIoMmioLib.h>
 
 #include <Guid/Fdt.h>
 #include <Guid/VirtioMmioTransport.h>
@@ -49,6 +50,7 @@ typedef enum {
   PropertyTypePsci,
   PropertyTypeFwCfg,
   PropertyTypeGicV3,
+  PropertyTypeXen,
 } PROPERTY_TYPE;
 
 typedef struct {
@@ -66,6 +68,7 @@ STATIC CONST PROPERTY CompatibleProperties[] = {
   { PropertyTypePsci,    "arm,psci-0.2"        },
   { PropertyTypeFwCfg,   "qemu,fw-cfg-mmio"    },
   { PropertyTypeGicV3,   "arm,gic-v3"          },
+  { PropertyTypeXen,     "xen,xen"             },
   { PropertyTypeUnknown, ""                    }
 };
 
@@ -332,6 +335,26 @@ InitializeVirtFdtDxe (
       }
       break;
 
+    case PropertyTypeXen:
+      ASSERT (Len == 16);
+
+      //
+      // Retrieve the reg base from this node and add it to a
+      // XENIO_PROTOCOL instance installed on a new handle.
+      //
+      RegBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]);
+      Handle = NULL;
+      Status = XenIoMmioInstall (&Handle, RegBase);
+      if (EFI_ERROR (Status)) {
+        DEBUG ((EFI_D_ERROR, "%a: Failed to install XENIO_PROTOCOL on a new 
handle "
+          "(Status == %r)\n", __FUNCTION__, Status));
+        break;
+      }
+
+      DEBUG ((EFI_D_INFO, "Found Xen node with Grant table @ 0x%p\n", 
RegBase));
+
+      break;
+
     default:
       break;
     }
diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf 
b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf
index 1392c7c3fa45..f8a58238c37b 100644
--- a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf
+++ b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf
@@ -41,6 +41,7 @@
   FdtLib
   VirtioMmioDeviceLib
   HobLib
+  XenIoMmioLib
 
 [Guids]
   gFdtTableGuid
-- 
1.8.3.2


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