MdePkg/Library/BaseLib/Ipf/CpuBreakpoint.c

   1 /** @file
   2   Base Library CPU functions for Itanium
   3
   4   Copyright (c) 2006, Intel Corporation<BR>
   5   All rights reserved. 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 //
  16 // Include common header file for this module.
  17 //
  18 #include <BaseLibInternals.h>
  19
  20 //void __mfa (void);
  21
  22 #pragma intrinsic (_enable)
  23 #pragma intrinsic (_disable)
  24 #pragma intrinsic (__break)
  25 #pragma intrinsic (__mfa)
  26
  27
  28 /**
  29   Generates a breakpoint on the CPU.
  30
  31   Generates a breakpoint on the CPU. The breakpoint must be implemented such
  32   that code can resume normal execution after the breakpoint.
  33
  34 **/
  35 VOID
  36 EFIAPI
  37 CpuBreakpoint (
  38   VOID
  39   )
  40 {
  41   __break (0);
  42 }
  43
  44 /**
  45   Used to serialize load and store operations.
  46
  47   All loads and stores that proceed calls to this function are guaranteed to be
  48   globally visible when this function returns.
  49
  50 **/
  51 VOID
  52 EFIAPI
  53 MemoryFence (
  54   VOID
  55   )
  56 {
  57   __mfa ();
  58 }
  59
  60 /**
  61   Disables CPU interrupts.
  62
  63   Disables CPU interrupts.
  64
  65 **/
  66 VOID
  67 EFIAPI
  68 DisableInterrupts (
  69   VOID
  70   )
  71 {
  72   _disable ();
  73 }
  74
  75 /**
  76   Enables CPU interrupts.
  77
  78   Enables CPU interrupts.
  79
  80 **/
  81 VOID
  82 EFIAPI
  83 EnableInterrupts (
  84   VOID
  85   )
  86 {
  87   _enable ();
  88 }
  89
  90 /**
  91   Enables CPU interrupts for the smallest window required to capture any
  92   pending interrupts.
  93
  94   Enables CPU interrupts for the smallest window required to capture any
  95   pending interrupts.
  96
  97 **/
  98 VOID
  99 EFIAPI
 100 EnableDisableInterrupts (
 101   VOID
 102   )
 103 {
 104   EnableInterrupts ();
 105   DisableInterrupts ();
 106 }
 107
 108 /**
 109   Places the CPU in a sleep state until an interrupt is received.
 110
 111   Places the CPU in a sleep state until an interrupt is received. If interrupts
 112   are disabled prior to calling this function, then the CPU will be placed in a
 113   sleep state indefinitely.
 114
 115 **/
 116 VOID
 117 EFIAPI
 118 CpuSleep (
 119   VOID
 120   )
 121 {
 122   PalCallStatic (NULL, 29, 0, 0, 0);
 123 }