PcAtChipsetPkg/Library/ResetSystemLib/ResetSystemLib.c

   1 /** @file
   2   Reset System Library functions for PCAT platforms
   3
   4   Copyright (c) 2006 - 2009, 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/DebugLib.h>
  18 #include <Library/IoLib.h>
  19
  20 /**
  21   Calling this function causes a system-wide reset. This sets
  22   all circuitry within the system to its initial state. This type of reset
  23   is asynchronous to system operation and operates without regard to
  24   cycle boundaries.
  25
  26   System reset should not return, if it returns, it means the system does
  27   not support cold reset.
  28 **/
  29 VOID
  30 EFIAPI
  31 ResetCold (
  32   VOID
  33   )
  34 {
  35   IoWrite8 (0x64, 0xfe);
  36 }
  37
  38 /**
  39   Calling this function causes a system-wide initialization. The processors
  40   are set to their initial state, and pending cycles are not corrupted.
  41
  42   System reset should not return, if it returns, it means the system does
  43   not support warm reset.
  44 **/
  45 VOID
  46 EFIAPI
  47 ResetWarm (
  48   VOID
  49   )
  50 {
  51   IoWrite8 (0x64, 0xfe);
  52 }
  53
  54 /**
  55   Calling this function causes the system to enter a power state equivalent
  56   to the ACPI G2/S5 or G3 states.
  57
  58   System shutdown should not return, if it returns, it means the system does
  59   not support shut down reset.
  60 **/
  61 VOID
  62 EFIAPI
  63 ResetShutdown (
  64   VOID
  65   )
  66 {
  67   ASSERT (FALSE);
  68 }
  69
  70
  71 /**
  72   Calling this function causes the system to enter a power state for capsule
  73   update.
  74
  75   Reset update should not return, if it returns, it means the system does
  76   not support capsule update.
  77
  78 **/
  79 VOID
  80 EFIAPI
  81 EnterS3WithImmediateWake (
  82   VOID
  83   )
  84 {
  85   ASSERT (FALSE);
  86 }