PcAtChipsetPkg/Library/ResetSystemLib/ResetSystemLib.c

   1 /** @file
   2   Reset System Library functions for PCAT platforms
   3
   4   Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include <Base.h>
  10
  11 #include <Library/DebugLib.h>
  12 #include <Library/IoLib.h>
  13
  14 /**
  15   Calling this function causes a system-wide reset. This sets
  16   all circuitry within the system to its initial state. This type of reset
  17   is asynchronous to system operation and operates without regard to
  18   cycle boundaries.
  19
  20   System reset should not return, if it returns, it means the system does
  21   not support cold reset.
  22 **/
  23 VOID
  24 EFIAPI
  25 ResetCold (
  26   VOID
  27   )
  28 {
  29   IoWrite8 ((UINTN) PcdGet64 (PcdResetControlRegister), PcdGet8 (PcdResetControlValueColdReset));
  30 }
  31
  32 /**
  33   Calling this function causes a system-wide initialization. The processors
  34   are set to their initial state, and pending cycles are not corrupted.
  35
  36   System reset should not return, if it returns, it means the system does
  37   not support warm reset.
  38 **/
  39 VOID
  40 EFIAPI
  41 ResetWarm (
  42   VOID
  43   )
  44 {
  45   IoWrite8 ((UINTN) PcdGet64 (PcdResetControlRegister), PcdGet8 (PcdResetControlValueColdReset));
  46 }
  47
  48 /**
  49   Calling this function causes the system to enter a power state equivalent
  50   to the ACPI G2/S5 or G3 states.
  51
  52   System shutdown should not return, if it returns, it means the system does
  53   not support shut down reset.
  54 **/
  55 VOID
  56 EFIAPI
  57 ResetShutdown (
  58   VOID
  59   )
  60 {
  61   ASSERT (FALSE);
  62 }
  63
  64
  65 /**
  66   Calling this function causes the system to enter a power state for capsule
  67   update.
  68
  69   Reset update should not return, if it returns, it means the system does
  70   not support capsule update.
  71
  72 **/
  73 VOID
  74 EFIAPI
  75 EnterS3WithImmediateWake (
  76   VOID
  77   )
  78 {
  79   ASSERT (FALSE);
  80 }
  81
  82 /**
  83   This function causes a systemwide reset. The exact type of the reset is
  84   defined by the EFI_GUID that follows the Null-terminated Unicode string passed
  85   into ResetData. If the platform does not recognize the EFI_GUID in ResetData
  86   the platform must pick a supported reset type to perform.The platform may
  87   optionally log the parameters from any non-normal reset that occurs.
  88
  89   @param[in]  DataSize   The size, in bytes, of ResetData.
  90   @param[in]  ResetData  The data buffer starts with a Null-terminated string,
  91                          followed by the EFI_GUID.
  92 **/
  93 VOID
  94 EFIAPI
  95 ResetPlatformSpecific (
  96   IN UINTN   DataSize,
  97   IN VOID    *ResetData
  98   )
  99 {
 100   ResetCold ();
 101 }