ArmVirtualizationPkg: use a HOB to store device tree blob

Instead of using a dynamic PCD, store the device tree address in a HOB
so that we can also run under a configuration that does not support
dynamic PCDs.

This also adds MemoryAllocationLib to the [LibraryClasses] section of
ArmVirtualizationPlatformLib/ArmVirtualizationPlatformLib.inf, as this
dependency was formerly satisfied transitively through one of the
library dependencies that were dropped.

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@16959 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualizationPkg.dec

@@ -44,8 +44,6 @@
   gArmVirtualizationTokenSpaceGuid.PcdDeviceTreeInitialBaseAddress|0x0|UINT64|0x00000001
 
 [PcdsDynamic, PcdsFixedAtBuild]
-  gArmVirtualizationTokenSpaceGuid.PcdDeviceTreeBaseAddress|0x0|UINT64|0x00000002
-
   #
   # ARM PSCI function invocations can be done either through hypervisor
   # calls (HVC) or secure monitor calls (SMC).

ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualizationQemu.dsc

@@ -176,9 +176,6 @@
   # System Memory Size -- 1 MB initially, actual size will be fetched from DT
   gArmTokenSpaceGuid.PcdSystemMemorySize|0x00100000
 
-  # location of the device tree blob passed by QEMU
-  gArmVirtualizationTokenSpaceGuid.PcdDeviceTreeBaseAddress|0x0
-
   gArmTokenSpaceGuid.PcdArmArchTimerSecIntrNum|0x0
   gArmTokenSpaceGuid.PcdArmArchTimerIntrNum|0x0
   gArmTokenSpaceGuid.PcdArmArchTimerVirtIntrNum|0x0

ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmVirtualizationPlatformLib/ArmVirtualizationPlatformLib.inf

@@ -30,11 +30,10 @@
 
 [LibraryClasses]
   IoLib
+  MemoryAllocationLib
   ArmLib
   PrintLib
   FdtLib
-  SerialPortLib
-  HobLib
 
 [Sources.common]
   Virt.c

ArmPlatformPkg/ArmVirtualizationPkg/Library/PlatformPeiLib/PlatformPeiLib.c

@@ -22,6 +22,7 @@
 #include <libfdt.h>
 
 #include <Guid/EarlyPL011BaseAddress.h>
+#include <Guid/FdtHob.h>
 
 EFI_STATUS
 EFIAPI
@@ -32,6 +33,7 @@ PlatformPeim (
   VOID               *Base;
   VOID               *NewBase;
   UINTN              FdtSize;
+  UINT64             *FdtHobData;
   UINT64             *UartHobData;
   INT32              Node, Prev;
   CONST CHAR8        *Compatible;
@@ -41,15 +43,18 @@ PlatformPeim (
   UINT64             UartBase;
 
 
-  Base = (VOID*)(UINTN)FixedPcdGet64 (PcdDeviceTreeInitialBaseAddress);
+  Base = (VOID*)(UINTN)PcdGet64 (PcdDeviceTreeInitialBaseAddress);
+  ASSERT (Base != NULL);
   ASSERT (fdt_check_header (Base) == 0);
 
   FdtSize = fdt_totalsize (Base);
   NewBase = AllocatePages (EFI_SIZE_TO_PAGES (FdtSize));
   ASSERT (NewBase != NULL);
-
   CopyMem (NewBase, Base, FdtSize);
-  PcdSet64 (PcdDeviceTreeBaseAddress, (UINT64)(UINTN)NewBase);
+
+  FdtHobData = BuildGuidHob (&gFdtHobGuid, sizeof *FdtHobData);
+  ASSERT (FdtHobData != NULL);
+  *FdtHobData = (UINTN)NewBase;
 
   UartHobData = BuildGuidHob (&gEarlyPL011BaseAddressGuid, sizeof *UartHobData);
   ASSERT (UartHobData != NULL);

ArmPlatformPkg/ArmVirtualizationPkg/Library/PlatformPeiLib/PlatformPeiLib.inf

@@ -41,11 +41,9 @@
   gArmTokenSpaceGuid.PcdFvSize
   gArmVirtualizationTokenSpaceGuid.PcdDeviceTreeInitialBaseAddress
 
-[Pcd]
-  gArmVirtualizationTokenSpaceGuid.PcdDeviceTreeBaseAddress
-
 [Guids]
   gEarlyPL011BaseAddressGuid
+  gFdtHobGuid
 
 [Depex]
   gEfiPeiMemoryDiscoveredPpiGuid

ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c

@@ -24,10 +24,12 @@
 #include <Library/DevicePathLib.h>
 #include <Library/PcdLib.h>
 #include <Library/DxeServicesLib.h>
+#include <Library/HobLib.h>
 #include <libfdt.h>
 
 #include <Guid/Fdt.h>
 #include <Guid/VirtioMmioTransport.h>
+#include <Guid/FdtHob.h>
 
 #pragma pack (1)
 typedef struct {
@@ -277,6 +279,7 @@ InitializeVirtFdtDxe (
   IN EFI_SYSTEM_TABLE     *SystemTable
   )
 {
+  VOID                           *Hob;
   VOID                           *DeviceTreeBase;
   INT32                          Node, Prev;
   INT32                          RtcNode;
@@ -297,8 +300,11 @@ InitializeVirtFdtDxe (
   UINT64                         FwCfgDataAddress;
   UINT64                         FwCfgDataSize;
 
-  DeviceTreeBase = (VOID *)(UINTN)PcdGet64 (PcdDeviceTreeBaseAddress);
+  Hob = GetFirstGuidHob(&gFdtHobGuid);
-  ASSERT (DeviceTreeBase != NULL);
+  if (Hob == NULL || GET_GUID_HOB_DATA_SIZE (Hob) != sizeof (UINT64)) {
+    return EFI_NOT_FOUND;
+  }
+  DeviceTreeBase = (VOID *)(UINTN)*(UINT64 *)GET_GUID_HOB_DATA (Hob);
 
   if (fdt_check_header (DeviceTreeBase) != 0) {
     DEBUG ((EFI_D_ERROR, "%a: No DTB found @ 0x%p\n", __FUNCTION__, DeviceTreeBase));

ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.inf

@@ -41,13 +41,14 @@
   DxeServicesLib
   FdtLib
   VirtioMmioDeviceLib
+  HobLib
 
 [Guids]
   gFdtTableGuid
   gVirtioMmioTransportGuid
+  gFdtHobGuid
 
 [Pcd]
-  gArmVirtualizationTokenSpaceGuid.PcdDeviceTreeBaseAddress
   gArmVirtualizationTokenSpaceGuid.PcdArmPsciMethod
   gArmVirtualizationTokenSpaceGuid.PcdFwCfgSelectorAddress
   gArmVirtualizationTokenSpaceGuid.PcdFwCfgDataAddress

EmbeddedPkg/EmbeddedPkg.dec

@@ -52,6 +52,8 @@
   ## FDT Configuration Table
   # Include/Guid/Fdt.h
   gFdtTableGuid = { 0xb1b621d5, 0xf19c, 0x41a5, { 0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0 } }
+  # Include/Guid/FdtHob.h
+  gFdtHobGuid   = { 0x16958446, 0x19B7, 0x480B, { 0xB0, 0x47, 0x74, 0x85, 0xAD, 0x3F, 0x71, 0x6D } }
   gFdtVariableGuid = { 0x25a4fd4a, 0x9703, 0x4ba9, { 0xa1, 0x90, 0xb7, 0xc8, 0x4e, 0xfb, 0x3e, 0x57 } }
 
 [Protocols.common]

EmbeddedPkg/Include/Guid/FdtHob.h

@@ -0,0 +1,26 @@
+/** @file
+  GUID for the HOB that contains the copy of the flattened device tree blob
+
+  Copyright (C) 2014, Linaro Ltd.
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License that accompanies this
+  distribution. The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php.
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
+  WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __FDT_HOB_H__
+#define __FDT_HOB_H__
+
+#define FDT_HOB_GUID { \
+          0x16958446, 0x19B7, 0x480B, \
+          { 0xB0, 0x47, 0x74, 0x85, 0xAD, 0x3F, 0x71, 0x6D } \
+        }
+
+extern EFI_GUID gFdtHobGuid;
+
+#endif