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   Generates a breakpoint on the CPU.
  24
  25   Generates a breakpoint on the CPU. The breakpoint must be implemented such
  26   that code can resume normal execution after the breakpoint.
  27
  28 **/
  29 VOID
  30 EFIAPI
  31 CpuBreakpoint (
  32   VOID
  33   )
  34 {
  35   __break (0);
  36 }
  37
  38 /**
  39   Used to serialize load and store operations.
  40
  41   All loads and stores that proceed calls to this function are guaranteed to be
  42   globally visible when this function returns.
  43
  44 **/
  45 VOID
  46 EFIAPI
  47 MemoryFence (
  48   VOID
  49   )
  50 {
  51   __mfa ();
  52 }
  53
  54 /**
  55   Disables CPU interrupts.
  56
  57   Disables CPU interrupts.
  58
  59 **/
  60 VOID
  61 EFIAPI
  62 DisableInterrupts (
  63   VOID
  64   )
  65 {
  66   _disable ();
  67 }
  68
  69 /**
  70   Enables CPU interrupts.
  71
  72   Enables CPU interrupts.
  73
  74 **/
  75 VOID
  76 EFIAPI
  77 EnableInterrupts (
  78   VOID
  79   )
  80 {
  81   _enable ();
  82 }
  83
  84 /**
  85   Retrieves the current CPU interrupt state.
  86
  87   Retrieves the current CPU interrupt state. Returns TRUE is interrupts are
  88   currently enabled. Otherwise returns FALSE.
  89
  90   @retval TRUE  CPU interrupts are enabled.
  91   @retval FALSE CPU interrupts are disabled.
  92
  93 **/
  94 BOOLEAN
  95 EFIAPI
  96 GetInterruptState (
  97   VOID
  98   )
  99 {
 100   return FALSE;
 101 }