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   Retrieves the current CPU interrupt state.
 102
 103   Retrieves the current CPU interrupt state. Returns TRUE is interrupts are
 104   currently enabled. Otherwise returns FALSE.
 105
 106   @retval TRUE  CPU interrupts are enabled.
 107   @retval FALSE CPU interrupts are disabled.
 108
 109 **/
 110 BOOLEAN
 111 EFIAPI
 112 GetInterruptState (
 113   VOID
 114   )
 115 {
 116   return FALSE;
 117 }
 118
 119 /**
 120   Enables CPU interrupts for the smallest window required to capture any
 121   pending interrupts.
 122
 123   Enables CPU interrupts for the smallest window required to capture any
 124   pending interrupts.
 125
 126 **/
 127 VOID
 128 EFIAPI
 129 EnableDisableInterrupts (
 130   VOID
 131   )
 132 {
 133   EnableInterrupts ();
 134   DisableInterrupts ();
 135 }
 136
 137 /**
 138   Places the CPU in a sleep state until an interrupt is received.
 139
 140   Places the CPU in a sleep state until an interrupt is received. If interrupts
 141   are disabled prior to calling this function, then the CPU will be placed in a
 142   sleep state indefinitely.
 143
 144 **/
 145 VOID
 146 EFIAPI
 147 CpuSleep (
 148   VOID
 149   )
 150 {
 151   PalCallStatic (NULL, 29, 0, 0, 0);
 152 }