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/** @file
OVMF ACPI Cloud Hypervisor support
Copyright (c) 2021, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <IndustryStandard/CloudHv.h> // CLOUDHV_RSDP_ADDRESS
#include <Library/BaseLib.h> // CpuDeadLoop()
#include <Library/DebugLib.h> // DEBUG()
#include "AcpiPlatform.h"
// Get the ACPI tables from EBDA start
EFI_STATUS
EFIAPI
InstallCloudHvTables (
IN EFI_ACPI_TABLE_PROTOCOL *AcpiProtocol
)
{
EFI_STATUS Status;
UINTN TableHandle;
EFI_ACPI_DESCRIPTION_HEADER *Xsdt;
VOID *CurrentTableEntry;
UINTN CurrentTablePointer;
EFI_ACPI_DESCRIPTION_HEADER *CurrentTable;
UINTN Index;
UINTN NumberOfTableEntries;
EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt2Table;
EFI_ACPI_DESCRIPTION_HEADER *DsdtTable;
Fadt2Table = NULL;
DsdtTable = NULL;
TableHandle = 0;
NumberOfTableEntries = 0;
EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *AcpiRsdpStructurePtr = (VOID *)CLOUDHV_RSDP_ADDRESS;
// If XSDT table is found, just install its tables.
// Otherwise, try to find and install the RSDT tables.
//
if (AcpiRsdpStructurePtr->XsdtAddress) {
//
// Retrieve the addresses of XSDT and
// calculate the number of its table entries.
//
Xsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)
AcpiRsdpStructurePtr->XsdtAddress;
NumberOfTableEntries = (Xsdt->Length -
sizeof (EFI_ACPI_DESCRIPTION_HEADER)) /
sizeof (UINT64);
//
// Install ACPI tables found in XSDT.
//
for (Index = 0; Index < NumberOfTableEntries; Index++) {
//
// Get the table entry from XSDT
//
CurrentTableEntry = (VOID *)((UINT8 *)Xsdt +
sizeof (EFI_ACPI_DESCRIPTION_HEADER) +
Index * sizeof (UINT64));
CurrentTablePointer = (UINTN)*(UINT64 *)CurrentTableEntry;
CurrentTable = (EFI_ACPI_DESCRIPTION_HEADER *)CurrentTablePointer;
//
// Install the XSDT tables
//
Status = AcpiProtocol->InstallAcpiTable (
AcpiProtocol,
CurrentTable,
CurrentTable->Length,
&TableHandle
);
if (EFI_ERROR (Status)) {
ASSERT_EFI_ERROR (Status);
return Status;
}
//
// Get the X-DSDT table address from the table FADT
//
if (!AsciiStrnCmp ((CHAR8 *)&CurrentTable->Signature, "FACP", 4)) {
Fadt2Table = (EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *)
(UINTN)CurrentTablePointer;
DsdtTable = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)Fadt2Table->XDsdt;
}
}
} else {
return EFI_NOT_FOUND;
}
//
// Install DSDT table. If we reached this point without finding the DSDT,
// then we're out of sync with the hypervisor, and cannot continue.
//
if (DsdtTable == NULL) {
DEBUG ((DEBUG_ERROR, "%a: no DSDT found\n", __FUNCTION__));
ASSERT (FALSE);
CpuDeadLoop ();
}
Status = AcpiProtocol->InstallAcpiTable (
AcpiProtocol,
DsdtTable,
DsdtTable->Length,
&TableHandle
);
if (EFI_ERROR (Status)) {
ASSERT_EFI_ERROR (Status);
return Status;
}
return EFI_SUCCESS;
}
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