[edk2-devel] [PATCH v5 32/36] OvmfPkg/LoongArchVirt: Add reset system library

["Chao Li" <lichao@loongson.cn>]

This library provides interface related to restart and shudown the
LoongArch64 virtual machine.

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4584

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Chao Li <lichao@loongson.cn>
Co-authored-by: Xianglai Li <lixianglai@loongson.cn>
Co-authored-by: Bibo Mao <maobibo@loongson.cn>
---
 .../BaseResetSystemAcpiGed.c                  | 148 ++++++++++
 .../BaseResetSystemAcpiGedLib.inf             |  36 +++
 .../DxeResetSystemAcpiGed.c                   | 259 ++++++++++++++++++
 .../DxeResetSystemAcpiGedLib.inf              |  41 +++
 .../ResetSystemAcpiLib/ResetSystemAcpiGed.c   | 125 +++++++++
 .../ResetSystemAcpiLib/ResetSystemAcpiGed.h   |  23 ++
 6 files changed, 632 insertions(+)
 create mode 100644 OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/BaseResetSystemAcpiGed.c
 create mode 100644 OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/BaseResetSystemAcpiGedLib.inf
 create mode 100644 OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/DxeResetSystemAcpiGed.c
 create mode 100644 OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/DxeResetSystemAcpiGedLib.inf
 create mode 100644 OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/ResetSystemAcpiGed.c
 create mode 100644 OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/ResetSystemAcpiGed.h

diff --git a/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/BaseResetSystemAcpiGed.c b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/BaseResetSystemAcpiGed.c
new file mode 100644
index 0000000000..9fd1ada9d3
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/BaseResetSystemAcpiGed.c
@@ -0,0 +1,148 @@
+/** @file
+  Base ResetSystem library implementation.
+
+  Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/QemuFwCfgLib.h>
+#include "ResetSystemAcpiGed.h"
+
+/**
+  Get configuration item data by the firmware configuration file name.
+
+  @param[in]  Name - Name of file to look up.
+
+  @return    VOID*       The Pointer of Value of Firmware Configuration item read.
+**/
+VOID *
+GetFwCfgData (
+  CONST CHAR8  *Name
+  )
+{
+  FIRMWARE_CONFIG_ITEM  FwCfgItem;
+  EFI_STATUS            Status;
+  UINTN                 FwCfgSize;
+  VOID                  *Data;
+
+  Status = QemuFwCfgFindFile (Name, &FwCfgItem, &FwCfgSize);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a %d read  %s error Status %d \n", __func__, __LINE__, Name, Status));
+    return NULL;
+  }
+
+  Data = AllocatePool (FwCfgSize);
+  if (Data == NULL) {
+    return NULL;
+  }
+
+  QemuFwCfgSelectItem (FwCfgItem);
+  QemuFwCfgReadBytes (FwCfgSize, Data);
+
+  return Data;
+}
+
+/**
+  Find the power manager related info from ACPI table
+
+  @retval RETURN_SUCCESS     Successfully find out all the required information.
+  @retval RETURN_NOT_FOUND   Failed to find the required info.
+**/
+STATIC EFI_STATUS
+GetPowerManagerByParseAcpiInfo (
+  VOID
+  )
+{
+  EFI_ACPI_5_0_FIXED_ACPI_DESCRIPTION_TABLE     *Fadt       = NULL;
+  EFI_ACPI_3_0_ROOT_SYSTEM_DESCRIPTION_POINTER  *Rsdp       = NULL;
+  EFI_ACPI_DESCRIPTION_HEADER                   *Xsdt       = NULL;
+  EFI_ACPI_DESCRIPTION_HEADER                   *Rsdt       = NULL;
+  VOID                                          *AcpiTables = NULL;
+  UINT32                                        *Entry32    = NULL;
+  UINTN                                         Entry32Num;
+  UINT32                                        *Signature = NULL;
+  UINTN                                         Idx;
+
+  Rsdp = GetFwCfgData ("etc/acpi/rsdp");
+  if (Rsdp == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a %d read etc/acpi/rsdp error \n", __func__, __LINE__));
+    return RETURN_NOT_FOUND;
+  }
+
+  AcpiTables = GetFwCfgData ("etc/acpi/tables");
+  if (AcpiTables == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a %d read etc/acpi/tables error \n", __func__, __LINE__));
+    FreePool (Rsdp);
+    return RETURN_NOT_FOUND;
+  }
+
+  Rsdt       = (EFI_ACPI_DESCRIPTION_HEADER *)((UINTN)AcpiTables +  Rsdp->RsdtAddress);
+  Entry32    = (UINT32 *)(Rsdt + 1);
+  Entry32Num = (Rsdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER)) >> 2;
+  for (Idx = 0; Idx < Entry32Num; Idx++) {
+    Signature = (UINT32 *)((UINTN)Entry32[Idx] + (UINTN)AcpiTables);
+    if (*Signature == EFI_ACPI_5_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE) {
+      Fadt = (EFI_ACPI_5_0_FIXED_ACPI_DESCRIPTION_TABLE *)Signature;
+      DEBUG ((DEBUG_INFO, "Found Fadt in Rsdt\n"));
+      goto Done;
+    }
+  }
+
+  Xsdt       = (EFI_ACPI_DESCRIPTION_HEADER *)((UINTN)AcpiTables +  Rsdp->XsdtAddress);
+  Entry32    = (UINT32 *)(Xsdt + 1);
+  Entry32Num = (Xsdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER)) >> 2;
+  for (Idx = 0; Idx < Entry32Num; Idx++) {
+    Signature = (UINT32 *)((UINTN)Entry32[Idx] + (UINTN)AcpiTables);
+    if (*Signature == EFI_ACPI_5_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE) {
+      Fadt = (EFI_ACPI_5_0_FIXED_ACPI_DESCRIPTION_TABLE *)Signature;
+      DEBUG ((DEBUG_INFO, "Found Fadt in Xsdt\n"));
+      goto Done;
+    }
+  }
+
+  FreePool (Rsdp);
+  FreePool (AcpiTables);
+  DEBUG ((DEBUG_ERROR, " Fadt Not Found\n"));
+  return RETURN_NOT_FOUND;
+
+Done:
+  mPowerManager.ResetRegAddr        = Fadt->ResetReg.Address;
+  mPowerManager.ResetValue          = Fadt->ResetValue;
+  mPowerManager.SleepControlRegAddr = Fadt->SleepControlReg.Address;
+  mPowerManager.SleepStatusRegAddr  = Fadt->SleepStatusReg.Address;
+
+  FreePool (Rsdp);
+  FreePool (AcpiTables);
+  return RETURN_SUCCESS;
+}
+
+/**
+  The constructor function to initialize mPowerManager.
+
+  @retval EFI_SUCCESS   initialize mPowerManager success.
+  @retval RETURN_NOT_FOUND   Failed to initialize mPowerManager.
+**/
+EFI_STATUS
+ResetSystemLibConstructor (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS  Status;
+
+  Status = GetPowerManagerByParseAcpiInfo ();
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_INFO, "%a:%d\n", __FUNCTION__, __LINE__));
+  }
+
+  ASSERT (mPowerManager.SleepControlRegAddr);
+  ASSERT (mPowerManager.SleepStatusRegAddr);
+  ASSERT (mPowerManager.ResetRegAddr);
+  return Status;
+}
diff --git a/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/BaseResetSystemAcpiGedLib.inf b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/BaseResetSystemAcpiGedLib.inf
new file mode 100644
index 0000000000..e163b09284
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/BaseResetSystemAcpiGedLib.inf
@@ -0,0 +1,36 @@
+## @file
+#  Base library instance for ResetSystem library class for LoongArch
+#
+#  Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 1.29
+  BASE_NAME                      = ResetSystemLib
+  FILE_GUID                      = BA521997-9016-32B5-65DF-EA5F560A3837
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = ResetSystemLib|SEC PEI_CORE PEIM DXE_CORE
+  CONSTRUCTOR                    = ResetSystemLibConstructor
+
+#
+#  VALID_ARCHITECTURES           = LOONGARCH64
+#
+
+[Sources]
+  BaseResetSystemAcpiGed.c
+  ResetSystemAcpiGed.c
+
+[Packages]
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+  DebugLib
+  IoLib
+  MemoryAllocationLib
+  QemuFwCfgLib
diff --git a/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/DxeResetSystemAcpiGed.c b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/DxeResetSystemAcpiGed.c
new file mode 100644
index 0000000000..29789809db
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/DxeResetSystemAcpiGed.c
@@ -0,0 +1,259 @@
+/** @file
+  Dxe ResetSystem library implementation.
+
+  Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Library/DebugLib.h>
+#include <Library/DxeServicesTableLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+#include <Library/UefiRuntimeLib.h> // EfiConvertPointer()
+#include "ResetSystemAcpiGed.h"
+
+/**
+  Modifies the attributes to Runtime type for a page size memory region.
+
+  @param  BaseAddress            Specified start address
+
+  @retval EFI_SUCCESS           The attributes were set for the memory region.
+  @retval EFI_INVALID_PARAMETER Length is zero.
+  @retval EFI_UNSUPPORTED       The processor does not support one or more bytes of the memory
+                                resource range specified by BaseAddress and Length.
+  @retval EFI_UNSUPPORTED       The bit mask of attributes is not support for the memory resource
+                                range specified by BaseAddress and Length.
+  @retval EFI_ACCESS_DEFINED    The attributes for the memory resource range specified by
+                                BaseAddress and Length cannot be modified.
+  @retval EFI_OUT_OF_RESOURCES  There are not enough system resources to modify the attributes of
+                                the memory resource range.
+  @retval EFI_NOT_AVAILABLE_YET The attributes cannot be set because CPU architectural protocol is
+                                not available yet.
+**/
+EFI_STATUS
+SetMemoryAttributesRunTime (
+  UINTN  Address
+  )
+{
+  EFI_STATUS                       Status;
+  EFI_GCD_MEMORY_SPACE_DESCRIPTOR  Descriptor;
+
+  Address &= ~EFI_PAGE_MASK;
+
+  Status = gDS->GetMemorySpaceDescriptor (Address, &Descriptor);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_INFO, "%a: GetMemorySpaceDescriptor failed\n", __FUNCTION__));
+    return Status;
+  }
+
+  if (Descriptor.GcdMemoryType == EfiGcdMemoryTypeNonExistent) {
+    Status = gDS->AddMemorySpace (
+                    EfiGcdMemoryTypeMemoryMappedIo,
+                    Address,
+                    EFI_PAGE_SIZE,
+                    EFI_MEMORY_UC | EFI_MEMORY_RUNTIME
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_INFO, "%a: AddMemorySpace failed\n", __FUNCTION__));
+      return Status;
+    }
+
+    Status = gDS->SetMemorySpaceAttributes (
+                    Address,
+                    EFI_PAGE_SIZE,
+                    EFI_MEMORY_RUNTIME
+                    );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_INFO, "%a:%d SetMemorySpaceAttributes failed\n", __FUNCTION__, __LINE__));
+      return Status;
+    }
+  } else if (!(Descriptor.Attributes & EFI_MEMORY_RUNTIME)) {
+    Status = gDS->SetMemorySpaceAttributes (
+                    Address,
+                    EFI_PAGE_SIZE,
+                    Descriptor.Attributes | EFI_MEMORY_RUNTIME
+                    );
+
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_INFO, "%a:%d SetMemorySpaceAttributes failed\n", __FUNCTION__, __LINE__));
+      return Status;
+    }
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Find the power manager related info from ACPI table
+
+  @retval RETURN_SUCCESS     Successfully find out all the required information.
+  @retval RETURN_NOT_FOUND   Failed to find the required info.
+**/
+STATIC EFI_STATUS
+GetPowerManagerByParseAcpiInfo (
+  VOID
+  )
+{
+  EFI_ACPI_5_0_FIXED_ACPI_DESCRIPTION_TABLE     *Fadt    = NULL;
+  EFI_ACPI_3_0_ROOT_SYSTEM_DESCRIPTION_POINTER  *Rsdp    = NULL;
+  EFI_ACPI_DESCRIPTION_HEADER                   *Xsdt    = NULL;
+  EFI_ACPI_DESCRIPTION_HEADER                   *Rsdt    = NULL;
+  UINT32                                        *Entry32 = NULL;
+  UINTN                                         Entry32Num;
+  UINT32                                        *Signature = NULL;
+  UINTN                                         Idx;
+  EFI_STATUS                                    Status;
+
+  Status = EfiGetSystemConfigurationTable (&gEfiAcpiTableGuid, (VOID **)&Rsdp);
+  if (EFI_ERROR (Status)) {
+    Status = EfiGetSystemConfigurationTable (&gEfiAcpi10TableGuid, (VOID **)&Rsdp);
+  }
+
+  if (EFI_ERROR (Status) || (Rsdp == NULL)) {
+    DEBUG ((DEBUG_ERROR, "EFI_ERROR or Rsdp == NULL\n"));
+    return RETURN_NOT_FOUND;
+  }
+
+  Rsdt       = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)Rsdp->RsdtAddress;
+  Entry32    = (UINT32 *)(UINTN)(Rsdt + 1);
+  Entry32Num = (Rsdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER)) >> 2;
+  for (Idx = 0; Idx < Entry32Num; Idx++) {
+    Signature = (UINT32 *)(UINTN)Entry32[Idx];
+    if (*Signature == EFI_ACPI_5_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE) {
+      Fadt = (EFI_ACPI_5_0_FIXED_ACPI_DESCRIPTION_TABLE *)Signature;
+      DEBUG ((DEBUG_INFO, "Found Fadt in Rsdt\n"));
+      goto Done;
+    }
+  }
+
+  Xsdt       = (EFI_ACPI_DESCRIPTION_HEADER *)Rsdp->XsdtAddress;
+  Entry32    = (UINT32 *)(Xsdt + 1);
+  Entry32Num = (Xsdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER)) >> 2;
+  for (Idx = 0; Idx < Entry32Num; Idx++) {
+    Signature = (UINT32 *)(UINTN)Entry32[Idx];
+    if (*Signature == EFI_ACPI_5_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE) {
+      Fadt = (EFI_ACPI_5_0_FIXED_ACPI_DESCRIPTION_TABLE *)Signature;
+      DEBUG ((DEBUG_INFO, "Found Fadt in Xsdt\n"));
+      goto Done;
+    }
+  }
+
+  DEBUG ((DEBUG_ERROR, " Fadt Not Found\n"));
+  return RETURN_NOT_FOUND;
+
+Done:
+  mPowerManager.ResetRegAddr        = Fadt->ResetReg.Address;
+  mPowerManager.ResetValue          = Fadt->ResetValue;
+  mPowerManager.SleepControlRegAddr = Fadt->SleepControlReg.Address;
+  mPowerManager.SleepStatusRegAddr  = Fadt->SleepStatusReg.Address;
+  return RETURN_SUCCESS;
+}
+
+/**
+  This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE
+  event. It converts a pointer to a new virtual address.
+
+  @param[in] Event        Event whose notification function is being invoked.
+  @param[in] Context      Pointer to the notification function's context
+**/
+VOID
+EFIAPI
+ResetSystemLibAddressChangeEvent (
+  IN EFI_EVENT  Event,
+  IN VOID       *Context
+  )
+{
+  EfiConvertPointer (0, (VOID **)&mPowerManager.SleepControlRegAddr);
+  EfiConvertPointer (0, (VOID **)&mPowerManager.SleepStatusRegAddr);
+  EfiConvertPointer (0, (VOID **)&mPowerManager.ResetRegAddr);
+}
+
+/**
+  Notification function of ACPI Table change.
+
+  This is a notification function registered on ACPI Table change event.
+  It saves the Century address stored in ACPI FADT table.
+
+  @param  Event        Event whose notification function is being invoked.
+  @param  Context      Pointer to the notification function's context.
+**/
+STATIC VOID
+AcpiNotificationEvent (
+  IN EFI_EVENT  Event,
+  IN VOID       *Context
+  )
+{
+  EFI_STATUS  Status;
+
+  Status = GetPowerManagerByParseAcpiInfo ();
+  if (EFI_ERROR (Status)) {
+    return;
+  }
+
+  DEBUG ((DEBUG_INFO, "%a: sleepControl %llx\n", __FUNCTION__, mPowerManager.SleepControlRegAddr));
+  ASSERT (mPowerManager.SleepControlRegAddr);
+  Status =  SetMemoryAttributesRunTime (mPowerManager.SleepControlRegAddr);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_INFO, "%a:%d\n", __FUNCTION__, __LINE__));
+    return;
+  }
+
+  DEBUG ((DEBUG_INFO, "%a: sleepStatus %llx\n", __FUNCTION__, mPowerManager.SleepStatusRegAddr));
+  ASSERT (mPowerManager.SleepStatusRegAddr);
+  Status =  SetMemoryAttributesRunTime (mPowerManager.SleepStatusRegAddr);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_INFO, "%a:%d\n", __FUNCTION__, __LINE__));
+    return;
+  }
+
+  DEBUG ((DEBUG_INFO, "%a: ResetReg %llx\n", __FUNCTION__, mPowerManager.ResetRegAddr));
+  ASSERT (mPowerManager.ResetRegAddr);
+  Status =  SetMemoryAttributesRunTime (mPowerManager.ResetRegAddr);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_INFO, "%a:%d\n", __FUNCTION__, __LINE__));
+  }
+
+  return;
+}
+
+/**
+  The constructor function to Register ACPI Table change event and Address Change Event.
+
+  @retval EFI_SUCCESS   The constructor always returns RETURN_SUCCESS.
+**/
+EFI_STATUS
+EFIAPI
+ResetSystemLibConstructor (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS  Status;
+  EFI_EVENT   Event;
+  EFI_EVENT   ResetSystemVirtualNotifyEvent;
+
+  Status = gBS->CreateEventEx (
+                  EVT_NOTIFY_SIGNAL,
+                  TPL_CALLBACK,
+                  AcpiNotificationEvent,
+                  NULL,
+                  &gEfiAcpiTableGuid,
+                  &Event
+                  );
+
+  //
+  // Register SetVirtualAddressMap () notify function
+  //
+  Status = gBS->CreateEvent (
+                  EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE,
+                  TPL_NOTIFY,
+                  ResetSystemLibAddressChangeEvent,
+                  NULL,
+                  &ResetSystemVirtualNotifyEvent
+                  );
+  ASSERT_EFI_ERROR (Status);
+  return Status;
+}
diff --git a/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/DxeResetSystemAcpiGedLib.inf b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/DxeResetSystemAcpiGedLib.inf
new file mode 100644
index 0000000000..9815e2f6e7
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/DxeResetSystemAcpiGedLib.inf
@@ -0,0 +1,41 @@
+## @file
+#  DXE library instance for ResetSystem library class for LoongArch.
+#
+#  Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 1.29
+  BASE_NAME                      = ResetSystemLib
+  FILE_GUID                      = F05197D5-5827-AA61-FB2D-BC69259F17A9
+  MODULE_TYPE                    = DXE_RUNTIME_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = ResetSystemLib|DXE_DRIVER DXE_RUNTIME_DRIVER SMM_CORE DXE_SMM_DRIVER UEFI_DRIVER UEFI_APPLICATION
+  CONSTRUCTOR                    = ResetSystemLibConstructor
+
+#
+#  VALID_ARCHITECTURES           = LOONGARCH64
+#
+
+[Sources]
+  DxeResetSystemAcpiGed.c
+  ResetSystemAcpiGed.c
+
+[Packages]
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+  DebugLib
+  DxeServicesTableLib
+  UefiBootServicesTableLib
+  UefiLib
+  UefiRuntimeLib
+
+[Guids]
+  gEfiAcpi10TableGuid                           ## PRODUCES           ## SystemTable
+  gEfiAcpiTableGuid                             ## PRODUCES           ## SystemTable
diff --git a/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/ResetSystemAcpiGed.c b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/ResetSystemAcpiGed.c
new file mode 100644
index 0000000000..105382da35
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/ResetSystemAcpiGed.c
@@ -0,0 +1,125 @@
+/** @file
+  ResetSystem library implementation.
+
+  Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>        // CpuDeadLoop()
+#include <Library/DebugLib.h>
+#include <Library/IoLib.h>
+#include <Library/ResetSystemLib.h> // ResetCold()
+#include "ResetSystemAcpiGed.h"
+
+POWER_MANAGER  mPowerManager;
+
+/**
+  Calling this function causes a system-wide reset. This sets
+  all circuitry within the system to its initial state. This type of reset
+  is asynchronous to system operation and operates without regard to
+  cycle boundaries.
+
+  System reset should not return, if it returns, it means the system does
+  not support cold reset.
+**/
+STATIC VOID
+AcpiGedReset (
+  VOID
+  )
+{
+  MmioWrite8 (
+    (UINTN)mPowerManager.ResetRegAddr,
+    mPowerManager.ResetValue
+    );
+
+  CpuDeadLoop ();
+}
+
+/**
+  This function causes the system to enter a power state equivalent
+    to the ACPI S5 states.
+
+ * */
+STATIC VOID
+AcpiGedShutdown (
+  VOID
+  )
+{
+  MmioWrite8 (
+    (UINTN)mPowerManager.SleepControlRegAddr,
+    (1 << 5) /* enable bit */ |
+    (5 << 2) /* typ == S5  */
+    );
+
+  CpuDeadLoop ();
+}
+
+/**
+  This function causes a system-wide reset (cold reset), in which
+  all circuitry within the system returns to its initial state. This type of
+  reset is asynchronous to system operation and operates without regard to
+  cycle boundaries.
+
+  If this function returns, it means that the system does not support cold
+  reset.
+**/
+VOID EFIAPI
+ResetCold (
+  VOID
+  )
+{
+  AcpiGedReset ();
+}
+
+/**
+  This function causes a system-wide initialization (warm reset), in which all
+  processors are set to their initial state. Pending cycles are not corrupted.
+
+  If this function returns, it means that the system does not support warm
+  reset.
+**/
+VOID EFIAPI
+ResetWarm (
+  VOID
+  )
+{
+  AcpiGedReset ();
+}
+
+/**
+  This function causes a systemwide reset. The exact type of the reset is
+  defined by the EFI_GUID that follows the Null-terminated Unicode string passed
+  into ResetData. If the platform does not recognize the EFI_GUID in ResetData
+  the platform must pick a supported reset type to perform.The platform may
+  optionally log the parameters from any non-normal reset that occurs.
+
+  @param[in]  DataSize   The size, in bytes, of ResetData.
+  @param[in]  ResetData  The data buffer starts with a Null-terminated string,
+                         followed by the EFI_GUID.
+**/
+VOID
+EFIAPI
+ResetPlatformSpecific (
+  IN UINTN  DataSize,
+  IN VOID   *ResetData
+  )
+{
+  AcpiGedReset ();
+}
+
+/**
+  This function causes the system to enter a power state equivalent
+  to the ACPI G2/S5 or G3 states.
+
+  If this function returns, it means that the system does not support shut down
+  reset.
+**/
+VOID EFIAPI
+ResetShutdown (
+  VOID
+  )
+{
+  AcpiGedShutdown ();
+}
diff --git a/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/ResetSystemAcpiGed.h b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/ResetSystemAcpiGed.h
new file mode 100644
index 0000000000..06e2572db0
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/ResetSystemAcpiLib/ResetSystemAcpiGed.h
@@ -0,0 +1,23 @@
+/** @file
+  ResetSystem lib head file.
+
+  Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef RESET_SYSTEM_ACPI_GED_H_
+#define RESET_SYSTEM_ACPI_GED_H_
+
+#include <Base.h>
+
+typedef struct {
+  UINT64    SleepControlRegAddr;
+  UINT64    SleepStatusRegAddr;
+  UINT64    ResetRegAddr;
+  UINT8     ResetValue;
+} POWER_MANAGER;
+
+extern POWER_MANAGER  mPowerManager;
+#endif // RESET_SYSTEM_ACPI_GED_H_
-- 
2.27.0



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