MdePkg/Library/BaseLib/Ebc/CpuBreakpoint.c

   1 /** @file
   2   Base Library CPU Functions for EBC
   3
   4   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "BaseLibInternals.h"
  10
  11 extern
  12 UINT64
  13 _break (
  14   CHAR8  BreakCode
  15   );
  16
  17 /**
  18   Generates a breakpoint on the CPU.
  19
  20   Generates a breakpoint on the CPU. The breakpoint must be implemented such
  21   that code can resume normal execution after the breakpoint.
  22
  23 **/
  24 VOID
  25 EFIAPI
  26 CpuBreakpoint (
  27   VOID
  28   )
  29 {
  30   _break (3);
  31 }
  32
  33 /**
  34   Used to serialize load and store operations.
  35
  36   All loads and stores that proceed calls to this function are guaranteed to be
  37   globally visible when this function returns.
  38
  39 **/
  40 VOID
  41 EFIAPI
  42 MemoryFence (
  43   VOID
  44   )
  45 {
  46 }
  47
  48 /**
  49   Disables CPU interrupts.
  50
  51 **/
  52 VOID
  53 EFIAPI
  54 DisableInterrupts (
  55   VOID
  56   )
  57 {
  58   ASSERT (FALSE);
  59 }
  60
  61 /**
  62   Enables CPU interrupts.
  63
  64 **/
  65 VOID
  66 EFIAPI
  67 EnableInterrupts (
  68   VOID
  69   )
  70 {
  71   ASSERT (FALSE);
  72 }
  73
  74 /**
  75   Retrieves the current CPU interrupt state.
  76
  77   Returns TRUE means interrupts are currently enabled. Otherwise,
  78   returns FALSE.
  79
  80   @retval TRUE  CPU interrupts are enabled.
  81   @retval FALSE CPU interrupts are disabled.
  82
  83 **/
  84 BOOLEAN
  85 EFIAPI
  86 GetInterruptState (
  87   VOID
  88   )
  89 {
  90   ASSERT (FALSE);
  91   return FALSE;
  92 }
  93
  94 /**
  95   Enables CPU interrupts for the smallest window required to capture any
  96   pending interrupts.
  97
  98 **/
  99 VOID
 100 EFIAPI
 101 EnableDisableInterrupts (
 102   VOID
 103   )
 104 {
 105   EnableInterrupts ();
 106   DisableInterrupts ();
 107 }
 108
 109 /**
 110   Requests CPU to pause for a short period of time.
 111
 112   Requests CPU to pause for a short period of time. Typically used in MP
 113   systems to prevent memory starvation while waiting for a spin lock.
 114
 115 **/
 116 VOID
 117 EFIAPI
 118 CpuPause (
 119   VOID
 120   )
 121 {
 122 }