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