1 files changed, 120 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Library/ResetSystemLib/ResetSystemLib.c b/roms/edk2/OvmfPkg/Library/ResetSystemLib/ResetSystemLib.c
new file mode 100644
index 000000000..fe51f53d1
--- /dev/null
+++ b/roms/edk2/OvmfPkg/Library/ResetSystemLib/ResetSystemLib.c
@@ -0,0 +1,120 @@
+/** @file
+  Reset System Library functions for OVMF
+
+  Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>                   // BIT1
+
+#include <Library/BaseLib.h>        // CpuDeadLoop()
+#include <Library/IoLib.h>          // IoWrite8()
+#include <Library/ResetSystemLib.h> // ResetCold()
+#include <Library/TimerLib.h>       // MicroSecondDelay()
+
+/**
+  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.
+**/
+VOID
+EFIAPI
+ResetCold (
+  VOID
+  )
+{
+  IoWrite8 (0xCF9, BIT2 | BIT1); // 1st choice: PIIX3 RCR, RCPU|SRST
+  MicroSecondDelay (50);
+
+  IoWrite8 (0x64, 0xfe);         // 2nd choice: keyboard controller
+  CpuDeadLoop ();
+}
+
+/**
+  Calling this function causes a system-wide initialization. The processors
+  are set to their initial state, and pending cycles are not corrupted.
+
+  System reset should not return, if it returns, it means the system does
+  not support warm reset.
+**/
+VOID
+EFIAPI
+ResetWarm (
+  VOID
+  )
+{
+  IoWrite8 (0x64, 0xfe);
+  CpuDeadLoop ();
+}
+
+
+/**
+  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
+  )
+{
+  ResetCold ();
+}
+
+/**
+  The ResetSystem function resets the entire platform.
+
+  @param[in] ResetType      The type of reset to perform.
+  @param[in] ResetStatus    The status code for the reset.
+  @param[in] DataSize       The size, in bytes, of ResetData.
+  @param[in] ResetData      For a ResetType of EfiResetCold, EfiResetWarm, or
+                            EfiResetShutdown the data buffer starts with a
+                            Null-terminated string, optionally followed by
+                            additional binary data. The string is a description
+                            that the caller may use to further indicate the
+                            reason for the system reset.
+**/
+VOID
+EFIAPI
+ResetSystem (
+  IN EFI_RESET_TYPE               ResetType,
+  IN EFI_STATUS                   ResetStatus,
+  IN UINTN                        DataSize,
+  IN VOID                         *ResetData OPTIONAL
+  )
+{
+  switch (ResetType) {
+  case EfiResetWarm:
+    ResetWarm ();
+    break;
+
+  case EfiResetCold:
+    ResetCold ();
+    break;
+
+  case EfiResetShutdown:
+    ResetShutdown ();
+    break;
+
+  case EfiResetPlatformSpecific:
+    ResetPlatformSpecific (DataSize, ResetData);
+    break;
+
+  default:
+    break;
+  }
+}