OvmfPkg/Library/ResetSystemLib/ResetSystemLib.c

   1 /** @file
   2   Reset System Library functions for OVMF
   3
   4   Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <Base.h>
  16
  17 #include <Library/BaseLib.h>
  18 #include <Library/DebugLib.h>
  19 #include <Library/IoLib.h>
  20 #include <Library/TimerLib.h>
  21
  22 #include <OvmfPlatforms.h>
  23
  24 VOID
  25 AcpiPmControl (
  26   UINTN SuspendType
  27   )
  28 {
  29   ASSERT (SuspendType < 6);
  30
  31   IoBitFieldWrite16 (PIIX4_PMBA_VALUE + 4, 10, 13, (UINT16) SuspendType);
  32   IoOr16 (PIIX4_PMBA_VALUE + 4, BIT13);
  33   CpuDeadLoop ();
  34 }
  35
  36 /**
  37   Calling this function causes a system-wide reset. This sets
  38   all circuitry within the system to its initial state. This type of reset
  39   is asynchronous to system operation and operates without regard to
  40   cycle boundaries.
  41
  42   System reset should not return, if it returns, it means the system does
  43   not support cold reset.
  44 **/
  45 VOID
  46 EFIAPI
  47 ResetCold (
  48   VOID
  49   )
  50 {
  51   IoWrite8 (0xCF9, BIT2 | BIT1); // 1st choice: PIIX3 RCR, RCPU|SRST
  52   MicroSecondDelay (50);
  53
  54   IoWrite8 (0x64, 0xfe);         // 2nd choice: keyboard controller
  55   CpuDeadLoop ();
  56 }
  57
  58 /**
  59   Calling this function causes a system-wide initialization. The processors
  60   are set to their initial state, and pending cycles are not corrupted.
  61
  62   System reset should not return, if it returns, it means the system does
  63   not support warm reset.
  64 **/
  65 VOID
  66 EFIAPI
  67 ResetWarm (
  68   VOID
  69   )
  70 {
  71   IoWrite8 (0x64, 0xfe);
  72   CpuDeadLoop ();
  73 }
  74
  75 /**
  76   Calling this function causes the system to enter a power state equivalent
  77   to the ACPI G2/S5 or G3 states.
  78
  79   System shutdown should not return, if it returns, it means the system does
  80   not support shut down reset.
  81 **/
  82 VOID
  83 EFIAPI
  84 ResetShutdown (
  85   VOID
  86   )
  87 {
  88   AcpiPmControl (0);
  89   ASSERT (FALSE);
  90 }
  91
  92
  93 /**
  94   Calling this function causes the system to enter a power state for capsule
  95   update.
  96
  97   Reset update should not return, if it returns, it means the system does
  98   not support capsule update.
  99
 100 **/
 101 VOID
 102 EFIAPI
 103 EnterS3WithImmediateWake (
 104   VOID
 105   )
 106 {
 107   AcpiPmControl (1);
 108   ASSERT (FALSE);
 109 }