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      1 /** @file
      2   Base Library CPU Functions for EBC
      3 
      4   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
      5   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 #include "BaseLibInternals.h"
     16 
     17 extern
     18 UINT64
     19 _break (
     20   CHAR8 BreakCode
     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 (3);
     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 }
     53 
     54 /**
     55   Disables CPU interrupts.
     56 
     57 **/
     58 VOID
     59 EFIAPI
     60 DisableInterrupts (
     61   VOID
     62   )
     63 {
     64   ASSERT (FALSE);
     65 }
     66 
     67 /**
     68   Enables CPU interrupts.
     69 
     70 **/
     71 VOID
     72 EFIAPI
     73 EnableInterrupts (
     74   VOID
     75   )
     76 {
     77   ASSERT (FALSE);
     78 }
     79 
     80 /**
     81   Retrieves the current CPU interrupt state.
     82 
     83   Returns TRUE means interrupts are currently enabled. Otherwise,
     84   returns FALSE.
     85 
     86   @retval TRUE  CPU interrupts are enabled.
     87   @retval FALSE CPU interrupts are disabled.
     88 
     89 **/
     90 BOOLEAN
     91 EFIAPI
     92 GetInterruptState (
     93   VOID
     94   )
     95 {
     96   ASSERT (FALSE);
     97   return FALSE;
     98 }
     99 
    100 /**
    101   Enables CPU interrupts for the smallest window required to capture any
    102   pending interrupts.
    103 
    104 **/
    105 VOID
    106 EFIAPI
    107 EnableDisableInterrupts (
    108   VOID
    109   )
    110 {
    111   EnableInterrupts ();
    112   DisableInterrupts ();
    113 }
    114 
    115 /**
    116   Requests CPU to pause for a short period of time.
    117 
    118   Requests CPU to pause for a short period of time. Typically used in MP
    119   systems to prevent memory starvation while waiting for a spin lock.
    120 
    121 **/
    122 VOID
    123 EFIAPI
    124 CpuPause (
    125   VOID
    126   )
    127 {
    128 }
    129 
    130