There is no device like Fw-cfg in Qemu in Cloud Hypervisor, so a specific
Acpi handler is introduced here.

The handler implemented here is in a very simple way:
1. acquire the RSDP from the PCD variable in the top ".dsc";
2. get the XSDT address from RSDP structure;
3. get the ACPI tables following the XSDT structure and install them
one by one;
4. get DSDT address from FADT and install DSDT table.

Signed-off-by: Jianyong Wu <jianyong.wu@...>
---
ArmVirtPkg/ArmVirtPkg.dec | 6 +
.../CloudHvAcpiPlatformDxe.inf | 47 ++++++
.../CloudHvAcpiPlatformDxe/CloudHvAcpi.c | 141 ++++++++++++++++++
3 files changed, 194 insertions(+)
create mode 100644 ArmVirtPkg/CloudHvAcpiPlatformDxe/CloudHvAcpiPlatformDxe.inf
create mode 100644 ArmVirtPkg/CloudHvAcpiPlatformDxe/CloudHvAcpi.c

diff --git a/ArmVirtPkg/ArmVirtPkg.dec b/ArmVirtPkg/ArmVirtPkg.dec
index bf82f7f1f3f2..4e4d758015bc 100644
--- a/ArmVirtPkg/ArmVirtPkg.dec
+++ b/ArmVirtPkg/ArmVirtPkg.dec
@@ -66,6 +66,12 @@ [PcdsFixedAtBuild, PcdsPatchableInModule]
#
gArmVirtTokenSpaceGuid.PcdTerminalTypeGuidBuffer|{0x65, 0x60, 0xA6, 0xDF, 0x19, 0xB4, 0xD3, 0x11, 0x9A, 0x2D, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D}|VOID*|0x00000007

+ ##
+ # This is the physical address of Rsdp which is the core struct of Acpi.
+ # Cloud Hypervisor has no other way to pass Rsdp address to the guest except use a PCD.
+ #
+ gArmVirtTokenSpaceGuid.PcdCloudHvAcpiRsdpBaseAddress|0x0|UINT64|0x00000005
+
[PcdsDynamic]
#
# Whether to force disable ACPI, regardless of the fw_cfg settings
diff --git a/ArmVirtPkg/CloudHvAcpiPlatformDxe/CloudHvAcpiPlatformDxe.inf b/ArmVirtPkg/CloudHvAcpiPlatformDxe/CloudHvAcpiPlatformDxe.inf
new file mode 100644
index 000000000000..01de76486686
--- /dev/null
+++ b/ArmVirtPkg/CloudHvAcpiPlatformDxe/CloudHvAcpiPlatformDxe.inf
@@ -0,0 +1,47 @@
+## @file
+# ACPI Platform Driver for Cloud Hypervisor
+#
+# Copyright (c) 2021, ARM Limited. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = CloudHvgAcpiPlatform
+ FILE_GUID = 6c76e407-73f2-dc1c-938f-5d6c4691ea93
+ MODULE_TYPE = DXE_DRIVER
+ VERSION_STRING = 1.0
+ ENTRY_POINT = CloudHvAcpiPlatformEntryPoint
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+ VALID_ARCHITECTURES = AARCH64
+#
+
+[Sources]
+ CloudHvAcpi.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ MdeModulePkg/MdeModulePkg.dec
+ OvmfPkg/OvmfPkg.dec
+ ArmVirtPkg/ArmVirtPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ DebugLib
+ MemoryAllocationLib
+ OrderedCollectionLib
+ UefiBootServicesTableLib
+ UefiDriverEntryPoint
+
+[Protocols]
+ gEfiAcpiTableProtocolGuid # PROTOCOL ALWAYS_CONSUMED
+
+[Pcd]
+ gArmVirtTokenSpaceGuid.PcdCloudHvAcpiRsdpBaseAddress
+
+[Depex]
+ gEfiAcpiTableProtocolGuid
diff --git a/ArmVirtPkg/CloudHvAcpiPlatformDxe/CloudHvAcpi.c b/ArmVirtPkg/CloudHvAcpiPlatformDxe/CloudHvAcpi.c
new file mode 100644
index 000000000000..0f1a50d63cd6
--- /dev/null
+++ b/ArmVirtPkg/CloudHvAcpiPlatformDxe/CloudHvAcpi.c
@@ -0,0 +1,141 @@
+/** @file
+ Install Acpi tables for Cloud Hypervisor
+
+ Copyright (c) 2021, Arm Limited. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <IndustryStandard/Acpi63.h>
+#include <Protocol/AcpiTable.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiDriverEntryPoint.h>
+#include <Library/DebugLib.h>
+
+/**
+ Find Acpi table Protocol and return it
+**/
+STATIC
+EFI_ACPI_TABLE_PROTOCOL *
+FindAcpiTableProtocol (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ EFI_ACPI_TABLE_PROTOCOL *AcpiTable;
+
+ Status = gBS->LocateProtocol (
+ &gEfiAcpiTableProtocolGuid,
+ NULL,
+ (VOID**)&AcpiTable
+ );
+ ASSERT_EFI_ERROR (Status);
+ return AcpiTable;
+}
+
+/** Install Acpi tables for Cloud Hypervisor
+
+ @param [in] AcpiProtocol Acpi Protocol which is used to install Acpi talbles
+
+ @return EFI_SUCCESS The table was successfully inserted.
+ @return EFI_INVALID_PARAMETER Either AcpiTableBuffer is NULL, TableKey is NULL, or AcpiTableBufferSize
+ and the size field embedded in the ACPI table pointed to by AcpiTableBuffer
+ are not in sync.
+ @return EFI_OUT_OF_RESOURCES Insufficient resources exist to complete the request.
+ @retval EFI_ACCESS_DENIED The table signature matches a table already
+ present in the system and platform policy
+ does not allow duplicate tables of this type.
+**/
+EFI_STATUS
+EFIAPI
+InstallCloudHvAcpiTables (
+ IN EFI_ACPI_TABLE_PROTOCOL *AcpiProtocol
+ )
+{
+ UINTN InstalledKey, TableSize, AcpiTableLength;
+ UINT64 RsdpPtr, XsdtPtr, TableOffset, AcpiTablePtr, DsdtPtr = ~0;
+ EFI_STATUS Status = EFI_SUCCESS;
+ BOOLEAN GotFacp = FALSE;
+
+ RsdpPtr = PcdGet64 (PcdCloudHvAcpiRsdpBaseAddress);
+ XsdtPtr = ((EFI_ACPI_6_3_ROOT_SYSTEM_DESCRIPTION_POINTER *) RsdpPtr)->XsdtAddress;
+ AcpiTableLength = ((EFI_ACPI_COMMON_HEADER *) XsdtPtr)->Length;
+ TableOffset = sizeof (EFI_ACPI_DESCRIPTION_HEADER);
+
+ while (!EFI_ERROR(Status)
+ && (TableOffset < AcpiTableLength))
+ {
+ AcpiTablePtr = *(UINT64 *) (XsdtPtr + TableOffset);
+ TableSize = ((EFI_ACPI_COMMON_HEADER *) AcpiTablePtr)->Length;
+
+ //
+ // Install ACPI tables from XSDT
+ //
+ Status = AcpiProtocol->InstallAcpiTable (
+ AcpiProtocol,
+ (VOID *)(UINT64)AcpiTablePtr,
+ TableSize,
+ &InstalledKey
+ );
+
+ TableOffset += sizeof (UINT64);
+
+ //
+ // Get DSDT from FADT
+ //
+ if (!GotFacp
+ && !AsciiStrnCmp ((CHAR8 *) &((EFI_ACPI_COMMON_HEADER *) AcpiTablePtr)->Signature, "FACP", 4))
+ {
+ DsdtPtr = ((EFI_ACPI_6_3_FIXED_ACPI_DESCRIPTION_TABLE *) AcpiTablePtr)->XDsdt;
+ GotFacp = TRUE;
+ }
+ }
+
+ if (DsdtPtr == ~0) {
+ DEBUG ((DEBUG_ERROR, "%a: no DSDT found\n", __FUNCTION__));
+ ASSERT (FALSE);
+ CpuDeadLoop ();
+ }
+
+ //
+ // Install DSDT table
+ //
+ TableSize = ((EFI_ACPI_COMMON_HEADER *) DsdtPtr)->Length;
+ Status = AcpiProtocol->InstallAcpiTable (
+ AcpiProtocol,
+ (VOID *)(UINT64) DsdtPtr,
+ TableSize,
+ &InstalledKey
+ );
+
+ return Status;
+}
+
+/** Entry point for Cloud Hypervisor Platform Dxe
+
+ @param [in] ImageHandle Handle for this image.
+ @param [in] SystemTable Pointer to the EFI system table.
+
+ @return EFI_SUCCESS The table was successfully inserted.
+ @return EFI_INVALID_PARAMETER Either AcpiTableBuffer is NULL, TableKey is NULL, or AcpiTableBufferSize
+ and the size field embedded in the ACPI table pointed to by AcpiTableBuffer
+ are not in sync.
+ @return EFI_OUT_OF_RESOURCES Insufficient resources exist to complete the request.
+ @retval EFI_ACCESS_DENIED The table signature matches a table already
+ present in the system and platform policy
+ does not allow duplicate tables of this type.
+**/
+EFI_STATUS
+EFIAPI
+CloudHvAcpiPlatformEntryPoint (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+
+ Status = InstallCloudHvAcpiTables (FindAcpiTableProtocol ());
+ return Status;
+}
--
2.17.1