OvmfPkg/XenAcpiPlatformDxe: create from AcpiPlatformDxe

Create an almost verbatim copy of the
"OvmfPkg/AcpiPlatformDxe/AcpiPlatformDxe.inf" driver for the OvmfXen
platform. We're going to trim the driver in subsequent patches.
Ultimately, the XenAcpiPlatformDxe driver will duplicate a negligible
amount of code that is currently present in the QemuFwCfgAcpiPlatformDxe
driver.

List the new driver in "Maintainers.txt", in the "OvmfPkg: Xen-related
modules" section.

Switch the OvmfXen platform to the new driver at once.

This patch should be reviewed with "git show --find-copies-harder".

Cc: Andrew Fish <afish@apple.com>
Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Julien Grall <julien@xen.org>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2122
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20210526201446.12554-12-lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>

OvmfPkg/XenAcpiPlatformDxe/AcpiPlatform.h

@@ -0,0 +1,102 @@
+/** @file
+  OVMF ACPI Platform Driver for Xen guests
+
+  Copyright (C) 2021, Red Hat, Inc.
+  Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef ACPI_PLATFORM_H_
+#define ACPI_PLATFORM_H_
+
+#include <Protocol/AcpiTable.h> // EFI_ACPI_TABLE_PROTOCOL
+#include <Protocol/PciIo.h>     // EFI_PCI_IO_PROTOCOL
+
+typedef struct {
+  EFI_PCI_IO_PROTOCOL *PciIo;
+  UINT64              PciAttributes;
+} ORIGINAL_ATTRIBUTES;
+
+typedef struct S3_CONTEXT S3_CONTEXT;
+
+EFI_STATUS
+EFIAPI
+InstallAcpiTable (
+  IN   EFI_ACPI_TABLE_PROTOCOL       *AcpiProtocol,
+  IN   VOID                          *AcpiTableBuffer,
+  IN   UINTN                         AcpiTableBufferSize,
+  OUT  UINTN                         *TableKey
+  );
+
+BOOLEAN
+QemuDetected (
+  VOID
+  );
+
+EFI_STATUS
+EFIAPI
+QemuInstallAcpiTable (
+  IN   EFI_ACPI_TABLE_PROTOCOL       *AcpiProtocol,
+  IN   VOID                          *AcpiTableBuffer,
+  IN   UINTN                         AcpiTableBufferSize,
+  OUT  UINTN                         *TableKey
+  );
+
+EFI_STATUS
+EFIAPI
+InstallXenTables (
+  IN   EFI_ACPI_TABLE_PROTOCOL       *AcpiProtocol
+  );
+
+EFI_STATUS
+EFIAPI
+InstallQemuFwCfgTables (
+  IN   EFI_ACPI_TABLE_PROTOCOL       *AcpiProtocol
+  );
+
+EFI_STATUS
+EFIAPI
+InstallAcpiTables (
+  IN   EFI_ACPI_TABLE_PROTOCOL       *AcpiTable
+  );
+
+VOID
+EnablePciDecoding (
+  OUT ORIGINAL_ATTRIBUTES **OriginalAttributes,
+  OUT UINTN               *Count
+  );
+
+VOID
+RestorePciDecoding (
+  IN ORIGINAL_ATTRIBUTES *OriginalAttributes,
+  IN UINTN               Count
+  );
+
+EFI_STATUS
+AllocateS3Context (
+  OUT S3_CONTEXT **S3Context,
+  IN  UINTN      WritePointerCount
+  );
+
+VOID
+ReleaseS3Context (
+  IN S3_CONTEXT *S3Context
+  );
+
+EFI_STATUS
+SaveCondensedWritePointerToS3Context (
+  IN OUT S3_CONTEXT *S3Context,
+  IN     UINT16     PointerItem,
+  IN     UINT8      PointerSize,
+  IN     UINT32     PointerOffset,
+  IN     UINT64     PointerValue
+  );
+
+EFI_STATUS
+TransferS3ContextToBootScript (
+  IN S3_CONTEXT *S3Context
+  );
+
+#endif
+