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

["maobibo" <maobibo@loongson.cn>]

On 2023/12/28 下午6:07, Chao Li wrote:
> 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_
> 
Reviewed-by: Bibo Mao <maobibo@loongson.cn>



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