OvmfPkg/Library/ResetSystemLib/ResetSystemLib.c

   1 /** @file
   2   Reset System Library functions for OVMF
   3
   4   Copyright (c) 2006 - 2011, 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
  21 VOID
  22 AcpiPmControl (
  23   UINTN SuspendType
  24   )
  25 {
  26   ASSERT (SuspendType < 6);
  27
  28   IoAndThenOr16 (0x404, ~0x3c00, SuspendType << 10);
  29   IoOr16 (0x404, BIT13);
  30   CpuDeadLoop ();
  31 }
  32
  33 /**
  34   Calling this function causes a system-wide reset. This sets
  35   all circuitry within the system to its initial state. This type of reset
  36   is asynchronous to system operation and operates without regard to
  37   cycle boundaries.
  38
  39   System reset should not return, if it returns, it means the system does
  40   not support cold reset.
  41 **/
  42 VOID
  43 EFIAPI
  44 ResetCold (
  45   VOID
  46   )
  47 {
  48   IoWrite8 (0x64, 0xfe);
  49 }
  50
  51 /**
  52   Calling this function causes a system-wide initialization. The processors
  53   are set to their initial state, and pending cycles are not corrupted.
  54
  55   System reset should not return, if it returns, it means the system does
  56   not support warm reset.
  57 **/
  58 VOID
  59 EFIAPI
  60 ResetWarm (
  61   VOID
  62   )
  63 {
  64   IoWrite8 (0x64, 0xfe);
  65 }
  66
  67 /**
  68   Calling this function causes the system to enter a power state equivalent
  69   to the ACPI G2/S5 or G3 states.
  70
  71   System shutdown should not return, if it returns, it means the system does
  72   not support shut down reset.
  73 **/
  74 VOID
  75 EFIAPI
  76 ResetShutdown (
  77   VOID
  78   )
  79 {
  80   AcpiPmControl (0);
  81   ASSERT (FALSE);
  82 }
  83
  84
  85 /**
  86   Calling this function causes the system to enter a power state for capsule
  87   update.
  88
  89   Reset update should not return, if it returns, it means the system does
  90   not support capsule update.
  91
  92 **/
  93 VOID
  94 EFIAPI
  95 EnterS3WithImmediateWake (
  96   VOID
  97   )
  98 {
  99   AcpiPmControl (1);
 100   ASSERT (FALSE);
 101 }