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/PcdLib.h>
  21 #include <Library/TimerLib.h>
  22
  23 VOID
  24 AcpiPmControl (
  25   UINTN SuspendType
  26   )
  27 {
  28   ASSERT (SuspendType < 6);
  29
  30   IoBitFieldWrite16  (PcdGet16 (PcdAcpiPmBaseAddress) + 4, 10, 13, (UINT16) SuspendType);
  31   IoOr16 (PcdGet16 (PcdAcpiPmBaseAddress) + 4, BIT13);
  32   CpuDeadLoop ();
  33 }
  34
  35 /**
  36   Calling this function causes a system-wide reset. This sets
  37   all circuitry within the system to its initial state. This type of reset
  38   is asynchronous to system operation and operates without regard to
  39   cycle boundaries.
  40
  41   System reset should not return, if it returns, it means the system does
  42   not support cold reset.
  43 **/
  44 VOID
  45 EFIAPI
  46 ResetCold (
  47   VOID
  48   )
  49 {
  50   IoWrite8 (0xCF9, BIT2 | BIT1); // 1st choice: PIIX3 RCR, RCPU|SRST
  51   MicroSecondDelay (50);
  52
  53   IoWrite8 (0x64, 0xfe);         // 2nd choice: keyboard controller
  54   CpuDeadLoop ();
  55 }
  56
  57 /**
  58   Calling this function causes a system-wide initialization. The processors
  59   are set to their initial state, and pending cycles are not corrupted.
  60
  61   System reset should not return, if it returns, it means the system does
  62   not support warm reset.
  63 **/
  64 VOID
  65 EFIAPI
  66 ResetWarm (
  67   VOID
  68   )
  69 {
  70   IoWrite8 (0x64, 0xfe);
  71   CpuDeadLoop ();
  72 }
  73
  74 /**
  75   Calling this function causes the system to enter a power state equivalent
  76   to the ACPI G2/S5 or G3 states.
  77
  78   System shutdown should not return, if it returns, it means the system does
  79   not support shut down reset.
  80 **/
  81 VOID
  82 EFIAPI
  83 ResetShutdown (
  84   VOID
  85   )
  86 {
  87   AcpiPmControl (0);
  88   ASSERT (FALSE);
  89 }
  90
  91
  92 /**
  93   Calling this function causes the system to enter a power state for capsule
  94   update.
  95
  96   Reset update should not return, if it returns, it means the system does
  97   not support capsule update.
  98
  99 **/
 100 VOID
 101 EFIAPI
 102 EnterS3WithImmediateWake (
 103   VOID
 104   )
 105 {
 106   AcpiPmControl (1);
 107   ASSERT (FALSE);
 108 }