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 typedef struct {
  23   UINT64                            Status;
  24   UINT64                            r9;
  25   UINT64                            r10;
  26   UINT64                            r11;
  27 } PAL_PROC_RETURN;
  28
  29 PAL_PROC_RETURN
  30 PalCallStatic (
  31   IN      CONST VOID                *PalEntryPoint,
  32   IN      UINT64                    Arg1,
  33   IN      UINT64                    Arg2,
  34   IN      UINT64                    Arg3,
  35   IN      UINT64                    Arg4
  36   );
  37
  38 /**
  39   Generates a breakpoint on the CPU.
  40
  41   Generates a breakpoint on the CPU. The breakpoint must be implemented such
  42   that code can resume normal execution after the breakpoint.
  43
  44 **/
  45 VOID
  46 EFIAPI
  47 CpuBreakpoint (
  48   VOID
  49   )
  50 {
  51   __break (0);
  52 }
  53
  54 /**
  55   Used to serialize load and store operations.
  56
  57   All loads and stores that proceed calls to this function are guaranteed to be
  58   globally visible when this function returns.
  59
  60 **/
  61 VOID
  62 EFIAPI
  63 MemoryFence (
  64   VOID
  65   )
  66 {
  67   __mfa ();
  68 }
  69
  70 /**
  71   Disables CPU interrupts.
  72
  73   Disables CPU interrupts.
  74
  75 **/
  76 VOID
  77 EFIAPI
  78 DisableInterrupts (
  79   VOID
  80   )
  81 {
  82   _disable ();
  83 }
  84
  85 /**
  86   Enables CPU interrupts.
  87
  88   Enables CPU interrupts.
  89
  90 **/
  91 VOID
  92 EFIAPI
  93 EnableInterrupts (
  94   VOID
  95   )
  96 {
  97   _enable ();
  98 }
  99
 100 /**
 101   Enables CPU interrupts for the smallest window required to capture any
 102   pending interrupts.
 103
 104   Enables CPU interrupts for the smallest window required to capture any
 105   pending interrupts.
 106
 107 **/
 108 VOID
 109 EFIAPI
 110 EnableDisableInterrupts (
 111   VOID
 112   )
 113 {
 114   EnableInterrupts ();
 115   DisableInterrupts ();
 116 }
 117
 118 /**
 119   Places the CPU in a sleep state until an interrupt is received.
 120
 121   Places the CPU in a sleep state until an interrupt is received. If interrupts
 122   are disabled prior to calling this function, then the CPU will be placed in a
 123   sleep state indefinitely.
 124
 125 **/
 126 VOID
 127 EFIAPI
 128 CpuSleep (
 129   VOID
 130   )
 131 {
 132   PalCallStatic (NULL, 29, 0, 0, 0);
 133 }