OvmfPkg/Library/ResetSystemLib/ResetSystemLib.c

   1 /** @file
   2   Reset System Library functions for OVMF
   3
   4   Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include <Base.h>
  10
  11 #include <Library/BaseLib.h>
  12 #include <Library/DebugLib.h>
  13 #include <Library/IoLib.h>
  14 #include <Library/TimerLib.h>
  15 #include <OvmfPlatforms.h>
  16
  17 #include <OvmfPlatforms.h>
  18
  19 VOID
  20 AcpiPmControl (
  21   UINTN SuspendType
  22   )
  23 {
  24   UINT16 AcpiPmBaseAddress;
  25   UINT16 HostBridgeDevId;
  26
  27   ASSERT (SuspendType < 6);
  28
  29   AcpiPmBaseAddress = 0;
  30   HostBridgeDevId = PciRead16 (OVMF_HOSTBRIDGE_DID);
  31   switch (HostBridgeDevId) {
  32   case INTEL_82441_DEVICE_ID:
  33     AcpiPmBaseAddress = PIIX4_PMBA_VALUE;
  34     break;
  35   case INTEL_Q35_MCH_DEVICE_ID:
  36     AcpiPmBaseAddress = ICH9_PMBASE_VALUE;
  37     break;
  38   default:
  39     ASSERT (FALSE);
  40     CpuDeadLoop ();
  41   }
  42
  43   IoBitFieldWrite16 (AcpiPmBaseAddress + 4, 10, 13, (UINT16) SuspendType);
  44   IoOr16 (AcpiPmBaseAddress + 4, BIT13);
  45   CpuDeadLoop ();
  46 }
  47
  48 /**
  49   Calling this function causes a system-wide reset. This sets
  50   all circuitry within the system to its initial state. This type of reset
  51   is asynchronous to system operation and operates without regard to
  52   cycle boundaries.
  53
  54   System reset should not return, if it returns, it means the system does
  55   not support cold reset.
  56 **/
  57 VOID
  58 EFIAPI
  59 ResetCold (
  60   VOID
  61   )
  62 {
  63   IoWrite8 (0xCF9, BIT2 | BIT1); // 1st choice: PIIX3 RCR, RCPU|SRST
  64   MicroSecondDelay (50);
  65
  66   IoWrite8 (0x64, 0xfe);         // 2nd choice: keyboard controller
  67   CpuDeadLoop ();
  68 }
  69
  70 /**
  71   Calling this function causes a system-wide initialization. The processors
  72   are set to their initial state, and pending cycles are not corrupted.
  73
  74   System reset should not return, if it returns, it means the system does
  75   not support warm reset.
  76 **/
  77 VOID
  78 EFIAPI
  79 ResetWarm (
  80   VOID
  81   )
  82 {
  83   IoWrite8 (0x64, 0xfe);
  84   CpuDeadLoop ();
  85 }
  86
  87 /**
  88   Calling this function causes the system to enter a power state equivalent
  89   to the ACPI G2/S5 or G3 states.
  90
  91   System shutdown should not return, if it returns, it means the system does
  92   not support shut down reset.
  93 **/
  94 VOID
  95 EFIAPI
  96 ResetShutdown (
  97   VOID
  98   )
  99 {
 100   AcpiPmControl (0);
 101   ASSERT (FALSE);
 102 }
 103
 104
 105 /**
 106   Calling this function causes the system to enter a power state for capsule
 107   update.
 108
 109   Reset update should not return, if it returns, it means the system does
 110   not support capsule update.
 111
 112 **/
 113 VOID
 114 EFIAPI
 115 EnterS3WithImmediateWake (
 116   VOID
 117   )
 118 {
 119   AcpiPmControl (1);
 120   ASSERT (FALSE);
 121 }
 122
 123 /**
 124   This function causes a systemwide reset. The exact type of the reset is
 125   defined by the EFI_GUID that follows the Null-terminated Unicode string passed
 126   into ResetData. If the platform does not recognize the EFI_GUID in ResetData
 127   the platform must pick a supported reset type to perform.The platform may
 128   optionally log the parameters from any non-normal reset that occurs.
 129
 130   @param[in]  DataSize   The size, in bytes, of ResetData.
 131   @param[in]  ResetData  The data buffer starts with a Null-terminated string,
 132                          followed by the EFI_GUID.
 133 **/
 134 VOID
 135 EFIAPI
 136 ResetPlatformSpecific (
 137   IN UINTN   DataSize,
 138   IN VOID    *ResetData
 139   )
 140 {
 141   ResetCold ();
 142 }