OvmfPkg: install an SSDT with a dynamic OperationRegion called FWDT

"FWDT" ("firmware data") is allocated as EfiReservedMemoryType, with
AllocateReservedPool(). <MdePkg/Include/Library/MemoryAllocationLib.h>
doesn't seem to provide direct access to EfiACPIReclaimMemory, but at this
point the former seems sufficient.

Based on SeaBIOS commit 2062f2ba by Gerd Hoffmann <kraxel@redhat.com>.

v3:
- coding style fixes:
  - BDAT     -> FWDT
  - __packed -> #pragma pack(1)
  - BFLD     -> FIRMWARE_DATA, PCI_WINDOW
  - Bfld     -> FwData
- Ssdt.asl: changed license to 2-clause BSDL, paraphrasing Dsdt.asl

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13573 6f19259b-4bc3-4df7-8a09-765794883524
MU SOURCE COMMIT:253a2ea73fe0a3a02177c25930c289df77e122b2

Platforms/OvmfPkg/AcpiPlatformDxe/Qemu.c

@@ -10,7 +10,7 @@
   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
-**/ 
+**/
 
 #include "AcpiPlatform.h"
 #include <Library/BaseMemoryLib.h>
@@ -98,6 +98,107 @@ QemuInstallAcpiMadtTable (
 }
 
 
+#pragma pack(1)
+
+typedef struct {
+  UINT64 Base;
+  UINT64 End;
+  UINT64 Length;
+} PCI_WINDOW;
+
+typedef struct {
+  PCI_WINDOW PciWindow32;
+  PCI_WINDOW PciWindow64;
+} FIRMWARE_DATA;
+
+#pragma pack()
+
+
+STATIC
+EFI_STATUS
+EFIAPI
+PopulateFwData(
+  OUT  FIRMWARE_DATA *FwData
+  )
+{
+  return EFI_SUCCESS;
+}
+
+
+STATIC
+EFI_STATUS
+EFIAPI
+QemuInstallAcpiSsdtTable (
+  IN   EFI_ACPI_TABLE_PROTOCOL       *AcpiProtocol,
+  IN   VOID                          *AcpiTableBuffer,
+  IN   UINTN                         AcpiTableBufferSize,
+  OUT  UINTN                         *TableKey
+  )
+{
+  EFI_STATUS    Status;
+  FIRMWARE_DATA *FwData;
+
+  Status = EFI_OUT_OF_RESOURCES;
+
+  FwData = AllocateReservedPool (sizeof (*FwData));
+  if (FwData != NULL) {
+    UINTN SsdtSize;
+    UINT8 *Ssdt;
+
+    SsdtSize = AcpiTableBufferSize + 17;
+    Ssdt = AllocatePool (SsdtSize);
+
+    if (Ssdt != NULL) {
+      Status = PopulateFwData (FwData);
+
+      if (Status == EFI_SUCCESS) {
+        UINT8 *SsdtPtr;
+
+        SsdtPtr = Ssdt;
+
+        CopyMem (SsdtPtr, AcpiTableBuffer, AcpiTableBufferSize);
+        SsdtPtr += AcpiTableBufferSize;
+
+        //
+        // build "OperationRegion(FWDT, SystemMemory, 0x12345678, 0x87654321)"
+        //
+        *(SsdtPtr++) = 0x5B; // ExtOpPrefix
+        *(SsdtPtr++) = 0x80; // OpRegionOp
+        *(SsdtPtr++) = 'F';
+        *(SsdtPtr++) = 'W';
+        *(SsdtPtr++) = 'D';
+        *(SsdtPtr++) = 'T';
+        *(SsdtPtr++) = 0x00; // SystemMemory
+        *(SsdtPtr++) = 0x0C; // DWordPrefix
+
+        //
+        // no virtual addressing yet, take the four least significant bytes
+        //
+        CopyMem(SsdtPtr, &FwData, 4);
+        SsdtPtr += 4;
+
+        *(SsdtPtr++) = 0x0C; // DWordPrefix
+
+        *(UINT32*) SsdtPtr = sizeof (*FwData);
+        SsdtPtr += 4;
+
+        ASSERT(SsdtPtr - Ssdt == SsdtSize);
+        ((EFI_ACPI_DESCRIPTION_HEADER *) Ssdt)->Length = SsdtSize;
+        Status = InstallAcpiTable (AcpiProtocol, Ssdt, SsdtSize, TableKey);
+      }
+
+      FreePool(Ssdt);
+    }
+
+    if (Status != EFI_SUCCESS) {
+      FreePool(FwData);
+    }
+  }
+
+  return Status;
+}
+
+
 EFI_STATUS
 EFIAPI
 QemuInstallAcpiTable (
@@ -115,6 +216,9 @@ QemuInstallAcpiTable (
   case EFI_ACPI_1_0_APIC_SIGNATURE:
     TableInstallFunction = QemuInstallAcpiMadtTable;
     break;
+  case EFI_ACPI_1_0_SECONDARY_SYSTEM_DESCRIPTION_TABLE_SIGNATURE:
+    TableInstallFunction = QemuInstallAcpiSsdtTable;
+    break;
   default:
     TableInstallFunction = InstallAcpiTable;
   }

Platforms/OvmfPkg/AcpiTables/AcpiTables.inf

@@ -33,6 +33,7 @@
   Facp.aslc
   Facs.aslc
   Dsdt.asl
+  Ssdt.asl
 
 [Packages]
   MdePkg/MdePkg.dec

Platforms/OvmfPkg/AcpiTables/Ssdt.asl

@@ -0,0 +1,19 @@
+/** @file
+  Placeholder for runtime-generated objects.
+
+  This empty table provides only a header for dynamic copying and extension,
+  and a trigger for QemuInstallAcpiSsdtTable().
+
+  Copyright (C) 2012 Red Hat, Inc.
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which 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.
+**/
+
+DefinitionBlock ("Ssdt.aml", "SSDT", 1, "REDHAT", "OVMF    ", 1) {
+}