[edk2-platforms][PATCH V1 14/15] Platform/Loongson: Add Reset System Lib.

["xianglai" <lixianglai@loongson.cn>]

This library provides interfaces related to restart and shutdown.

Signed-off-by: xianglai li <lixianglai@loongson.cn>
---
 .../Library/ResetSystemLib/ResetSystemLib.c   | 155 ++++++++++++++++++
 .../Library/ResetSystemLib/ResetSystemLib.inf |  40 +++++
 2 files changed, 195 insertions(+)
 create mode 100644 Platform/Loongson/LoongArchQemuPkg/Library/ResetSystemLib/ResetSystemLib.c
 create mode 100644 Platform/Loongson/LoongArchQemuPkg/Library/ResetSystemLib/ResetSystemLib.inf

diff --git a/Platform/Loongson/LoongArchQemuPkg/Library/ResetSystemLib/ResetSystemLib.c b/Platform/Loongson/LoongArchQemuPkg/Library/ResetSystemLib/ResetSystemLib.c
new file mode 100644
index 0000000000..3adcb5193a
--- /dev/null
+++ b/Platform/Loongson/LoongArchQemuPkg/Library/ResetSystemLib/ResetSystemLib.c
@@ -0,0 +1,155 @@
+/** @file
+  Base Reset System Library Shutdown API implementation for LoongArch.
+
+  Copyright (c) 2021 Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Uefi.h>
+#include <Library/BaseLib.h>
+#include <Library/CacheMaintenanceLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/IoLib.h>
+#include <Library/PcdLib.h>
+#include <Library/DebugLib.h>
+#include <Library/UefiRuntimeLib.h>
+#include <LoongArchQemuPlatform.h>
+/**
+  To get acpi base address.
+
+  @param  VOID
+
+  @retval  acpi base address.
+**/
+UINTN
+LoongArchQemuAcpiBase (VOID)
+{
+  VOID *Address = (VOID*) LS7A_ACPI_REG_BASE;
+
+  if (EfiGoneVirtual ()) {
+    /**The RTC controller address and the ResetSystem controller address are in the same page.
+       The function KVMToolRTCMapMemory has placed the entire page address in the memory mapping table,
+       do not add additional.
+     * */
+    EfiConvertPointer (0, &Address);
+    DEBUG ((DEBUG_INFO, "%a: virtual -> 0x%x\n", __FUNCTION__, Address));
+  } else {
+    DEBUG ((DEBUG_INFO, "%a: physical -> 0x%x\n", __FUNCTION__, Address));
+  }
+
+  return (UINTN) Address;
+}
+/**
+  Restart device.
+
+  @param  VOID
+
+  @retval  VOID
+**/
+VOID
+LoongArchQemuReset (VOID)
+{
+
+  UINTN Address;
+
+  DEBUG ((DEBUG_INFO, "%a: LoongArchQemu reset via acpi\n", __FUNCTION__));
+
+  Address = LoongArchQemuAcpiBase ();
+  MmioWrite32 (Address + LS7A_GPE0_RESET_REG, 1);
+  CpuDeadLoop ();
+}
+/**
+  Shutdown device.
+
+  @param  VOID
+
+  @retval  VOID
+**/
+VOID
+LoongArchQemuShutdown (VOID)
+{
+  UINTN  Address;
+
+  //
+  // sleep with S5
+  //
+  Address = LoongArchQemuAcpiBase ();
+  MmioWrite16 (Address + LS7A_PM_CNT_BLK, ACPI_BITMASK_SLEEP_ENABLE);
+  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)
+{
+  LoongArchQemuReset ();
+}
+
+/**
+ 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)
+{
+  LoongArchQemuReset ();
+}
+
+/**
+ 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
+  )
+{
+  LoongArchQemuReset ();
+}
+
+/**
+ 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 shutdown reset.
+**/
+VOID
+EFIAPI ResetShutdown (VOID)
+{
+  LoongArchQemuShutdown ();
+}
+
+
+/**
+  This function causes the system to enter S3 and then wake up immediately.
+
+  If this function returns, it means that the system does not support S3 feature.
+ **/
+VOID
+EFIAPI
+EnterS3WithImmediateWake (
+  VOID
+  )
+{
+  // not implemented
+}
diff --git a/Platform/Loongson/LoongArchQemuPkg/Library/ResetSystemLib/ResetSystemLib.inf b/Platform/Loongson/LoongArchQemuPkg/Library/ResetSystemLib/ResetSystemLib.inf
new file mode 100644
index 0000000000..03bb479d73
--- /dev/null
+++ b/Platform/Loongson/LoongArchQemuPkg/Library/ResetSystemLib/ResetSystemLib.inf
@@ -0,0 +1,40 @@
+## @file
+#  Base Reset System Library Shutdown API implementation for LoongArch.
+#
+#  Copyright (c) 2021 Loongson Technology Corporation Limited. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = ResetSystemLib
+  FILE_GUID                      = e8579e63-0275-42d6-b52e-0f6d3a8e3369
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = EfiResetSystemLib
+
+
+[Sources.common]
+  ResetSystemLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+  Platform/Loongson/LoongArchQemuPkg/Loongson.dec
+
+[LibraryClasses]
+  DebugLib
+  CacheMaintenanceLib
+  MemoryAllocationLib
+  UefiRuntimeServicesTableLib
+  TimerLib
+  UefiLib
+  UefiBootServicesTableLib
+
+[Protocols]
+  gEfiPciRootBridgeIoProtocolGuid
+
+[Pcd]
+  gEmbeddedTokenSpaceGuid.PcdFlashFvMainBase
-- 
2.27.0