EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ebc/CpuBreakpoint.c

   1 /*++
   2
   3 Copyright (c) 2004 - 2006, Intel Corporation
   4 All rights reserved. This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12
  13 Module Name:
  14
  15   CpuBreakpoint.c
  16
  17 Abstract:
  18
  19
  20 --*/
  21
  22 #include "..\BaseLibInternal.h"
  23
  24 extern
  25 UINT64
  26 _break (
  27   CHAR8 BreakCode
  28   );
  29
  30 /**
  31   Generates a breakpoint on the CPU.
  32
  33   Generates a breakpoint on the CPU. The breakpoint must be implemented such
  34   that code can resume normal execution after the breakpoint.
  35
  36 **/
  37 VOID
  38 EFIAPI
  39 CpuBreakpoint (
  40   VOID
  41   )
  42 {
  43   _break (3);
  44 }
  45
  46 /**
  47   Used to serialize load and store operations.
  48
  49   All loads and stores that proceed calls to this function are guaranteed to be
  50   globally visible when this function returns.
  51
  52 **/
  53 VOID
  54 EFIAPI
  55 MemoryFence (
  56   VOID
  57   )
  58 {
  59 }
  60
  61 /**
  62   Disables CPU interrupts.
  63
  64   Disables CPU interrupts.
  65
  66 **/
  67 VOID
  68 EFIAPI
  69 DisableInterrupts (
  70   VOID
  71   )
  72 {
  73   ASSERT (FALSE);
  74 }
  75
  76 /**
  77   Enables CPU interrupts.
  78
  79   Enables CPU interrupts.
  80
  81 **/
  82 VOID
  83 EFIAPI
  84 EnableInterrupts (
  85   VOID
  86   )
  87 {
  88   ASSERT (FALSE);
  89 }
  90
  91 /**
  92   Retrieves the current CPU interrupt state.
  93
  94   Retrieves the current CPU interrupt state. Returns TRUE is interrupts are
  95   currently enabled. Otherwise returns FALSE.
  96
  97   @retval TRUE  CPU interrupts are enabled.
  98   @retval FALSE CPU interrupts are disabled.
  99
 100 **/
 101 BOOLEAN
 102 EFIAPI
 103 GlueGetInterruptState (
 104   VOID
 105   )
 106 {
 107   ASSERT (FALSE);
 108   return FALSE;
 109 }
 110
 111 /**
 112   Enables CPU interrupts for the smallest window required to capture any
 113   pending interrupts.
 114
 115   Enables CPU interrupts for the smallest window required to capture any
 116   pending interrupts.
 117
 118 **/
 119 VOID
 120 EFIAPI
 121 EnableDisableInterrupts (
 122   VOID
 123   )
 124 {
 125   EnableInterrupts ();
 126   DisableInterrupts ();
 127 }
 128
 129 /**
 130   Requests CPU to pause for a short period of time.
 131
 132   Requests CPU to pause for a short period of time. Typically used in MP
 133   systems to prevent memory starvation while waiting for a spin lock.
 134
 135 **/
 136 VOID
 137 EFIAPI
 138 CpuPause (
 139   VOID
 140   )
 141 {
 142 }
 143
 144 /**
 145   Flushes all the Translation Lookaside Buffers(TLB) entries in a CPU.
 146
 147   Flushes all the Translation Lookaside Buffers(TLB) entries in a CPU.
 148
 149 **/
 150 VOID
 151 EFIAPI
 152 CpuFlushTlb (
 153   VOID
 154   )
 155 {
 156   ASSERT (FALSE);
 157 }
 158
 159 /**
 160   Places the CPU in a sleep state until an interrupt is received.
 161
 162   Places the CPU in a sleep state until an interrupt is received. If interrupts
 163   are disabled prior to calling this function, then the CPU will be placed in a
 164   sleep state indefinitely.
 165
 166 **/
 167 VOID
 168 EFIAPI
 169 CpuSleep (
 170   VOID
 171   )
 172 {
 173 }