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, (UINT16) ~0x3c00, (UINT16) (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 (0xCF9, BIT2 | BIT1); // 1st choice: PIIX3 RCR, RCPU|SRST
  49   IoWrite8 (0x64, 0xfe);         // 2nd choice: keyboard controller
  50 }
  51
  52 /**
  53   Calling this function causes a system-wide initialization. The processors
  54   are set to their initial state, and pending cycles are not corrupted.
  55
  56   System reset should not return, if it returns, it means the system does
  57   not support warm reset.
  58 **/
  59 VOID
  60 EFIAPI
  61 ResetWarm (
  62   VOID
  63   )
  64 {
  65   IoWrite8 (0x64, 0xfe);
  66 }
  67
  68 /**
  69   Calling this function causes the system to enter a power state equivalent
  70   to the ACPI G2/S5 or G3 states.
  71
  72   System shutdown should not return, if it returns, it means the system does
  73   not support shut down reset.
  74 **/
  75 VOID
  76 EFIAPI
  77 ResetShutdown (
  78   VOID
  79   )
  80 {
  81   AcpiPmControl (0);
  82   ASSERT (FALSE);
  83 }
  84
  85
  86 /**
  87   Calling this function causes the system to enter a power state for capsule
  88   update.
  89
  90   Reset update should not return, if it returns, it means the system does
  91   not support capsule update.
  92
  93 **/
  94 VOID
  95 EFIAPI
  96 EnterS3WithImmediateWake (
  97   VOID
  98   )
  99 {
 100   AcpiPmControl (1);
 101   ASSERT (FALSE);
 102 }