From 6abe83c3c884f86bd423d6155eb1b7f6d2833fd9 Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Sat, 28 Feb 2015 20:34:26 +0000
Subject: [PATCH] ArmVirtualizationPkg/VirtFdtDxe: wire up XenBusDxe to
 "xen,xen" DT node

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
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Olivier Martin <olivier.martin@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16980 6f19259b-4bc3-4df7-8a09-765794883524
---
 .../ArmVirtualization.dsc.inc                 |  2 ++
 .../VirtFdtDxe/VirtFdtDxe.c                   | 23 +++++++++++++++++++
 .../VirtFdtDxe/VirtFdtDxe.inf                 |  1 +
 3 files changed, 26 insertions(+)

diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualization.dsc.inc b/ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualization.dsc.inc
index 1a82762cbc..565f243091 100644
--- a/ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualization.dsc.inc
+++ b/ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualization.dsc.inc
@@ -107,6 +107,8 @@
   # USB Libraries
   UefiUsbLib|MdePkg/Library/UefiUsbLib/UefiUsbLib.inf
 
+  XenIoMmioLib|OvmfPkg/Library/XenIoMmioLib/XenIoMmioLib.inf
+
 [LibraryClasses.common.SEC]
   PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
   ArmPlatformSecExtraActionLib|ArmPlatformPkg/Library/DebugSecExtraActionLib/DebugSecExtraActionLib.inf
diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
index e63294a12e..c9a181a871 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>
@@ -50,6 +51,7 @@ typedef enum {
   PropertyTypeFwCfg,
   PropertyTypePciHost,
   PropertyTypeGicV3,
+  PropertyTypeXen,
 } PROPERTY_TYPE;
 
 typedef struct {
@@ -68,6 +70,7 @@ STATIC CONST PROPERTY CompatibleProperties[] = {
   { PropertyTypeFwCfg,   "qemu,fw-cfg-mmio"      },
   { PropertyTypePciHost, "pci-host-ecam-generic" },
   { PropertyTypeGicV3,   "arm,gic-v3"            },
+  { PropertyTypeXen,     "xen,xen"               },
   { PropertyTypeUnknown, ""                      }
 };
 
@@ -523,6 +526,26 @@ InitializeVirtFdtDxe (
       }
       break;
 
+    case PropertyTypeXen:
+      ASSERT (Len == 16);
+
+      //
+      // Retrieve the reg base from this node and wire it up to the
+      // MMIO flavor of the XenBus root device I/O protocol
+      //
+      RegBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]);
+      Handle = NULL;
+      Status = XenIoMmioInstall (&Handle, RegBase);
+      if (EFI_ERROR (Status)) {
+        DEBUG ((EFI_D_ERROR, "%a: XenIoMmioInstall () failed on a new handle "
+          "(Status == %r)\n", __FUNCTION__, Status));
+        break;
+      }
+
+      DEBUG ((EFI_D_INFO, "Found Xen node with Grant table @ 0x%Lx\n", RegBase));
+
+      break;
+
     default:
       break;
     }
diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf
index bca0f0b5f3..d830dd131d 100644
--- a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf
+++ b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf
@@ -42,6 +42,7 @@
   FdtLib
   VirtioMmioDeviceLib
   HobLib
+  XenIoMmioLib
 
 [Guids]
   gFdtTableGuid