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/** @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
**/
#include <Library/AcpiPlatformLib.h> // InstallAcpiTablesFromMemory()
#include <Library/DebugLib.h> // DEBUG()
#include <Library/XenPlatformLib.h> // XenDetected()
#include "AcpiPlatform.h"
#define XEN_ACPI_PHYSICAL_ADDRESS 0x000EA020
#define XEN_BIOS_PHYSICAL_END 0x000FFFFF
/**
Effective entrypoint of Acpi Platform driver.
@param ImageHandle
@param SystemTable
@return EFI_SUCCESS
@return EFI_LOAD_ERROR
@return EFI_OUT_OF_RESOURCES
**/
EFI_STATUS
EFIAPI
InstallAcpiTables (
IN EFI_ACPI_TABLE_PROTOCOL *AcpiTable
)
{
EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *RsdpStructurePtr;
EFI_XEN_INFO *XenInfo;
EFI_STATUS Status;
if (XenDetected ()) {
//
// Detect the RSDP structure
//
//
// First look for PVH one
//
XenInfo = XenGetInfoHOB ();
ASSERT (XenInfo != NULL);
if (XenInfo->RsdpPvh != NULL) {
DEBUG ((
DEBUG_INFO,
"%a: Use ACPI RSDP table at 0x%p\n",
gEfiCallerBaseName,
XenInfo->RsdpPvh
));
RsdpStructurePtr = XenInfo->RsdpPvh;
} else {
//
// Otherwise, look for the HVM one
//
Status = GetAcpiRsdpFromMemory (
XEN_ACPI_PHYSICAL_ADDRESS,
XEN_BIOS_PHYSICAL_END,
&RsdpStructurePtr
);
if (EFI_ERROR (Status)) {
return Status;
}
}
Status = InstallAcpiTablesFromRsdp (
AcpiTable,
RsdpStructurePtr
);
} else {
Status = EFI_UNSUPPORTED;
}
return Status;
}
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