MdePkg/Library/BaseLib/Ebc/CpuBreakpoint.c

/** @file
  Base Library CPU Functions for EBC

  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "BaseLibInternals.h"

extern
UINT64
_break (
  CHAR8  BreakCode
  );

/**
  Generates a breakpoint on the CPU.

  Generates a breakpoint on the CPU. The breakpoint must be implemented such
  that code can resume normal execution after the breakpoint.

**/
VOID
EFIAPI
CpuBreakpoint (
  VOID
  )
{
  _break (3);
}

/**
  Used to serialize load and store operations.

  All loads and stores that proceed calls to this function are guaranteed to be
  globally visible when this function returns.

**/
VOID
EFIAPI
MemoryFence (
  VOID
  )
{
}

/**
  Disables CPU interrupts.

**/
VOID
EFIAPI
DisableInterrupts (
  VOID
  )
{
  ASSERT (FALSE);
}

/**
  Enables CPU interrupts.

**/
VOID
EFIAPI
EnableInterrupts (
  VOID
  )
{
  ASSERT (FALSE);
}

/**
  Retrieves the current CPU interrupt state.

  Returns TRUE means interrupts are currently enabled. Otherwise,
  returns FALSE.

  @retval TRUE  CPU interrupts are enabled.
  @retval FALSE CPU interrupts are disabled.

**/
BOOLEAN
EFIAPI
GetInterruptState (
  VOID
  )
{
  ASSERT (FALSE);
  return FALSE;
}

/**
  Enables CPU interrupts for the smallest window required to capture any
  pending interrupts.

**/
VOID
EFIAPI
EnableDisableInterrupts (
  VOID
  )
{
  EnableInterrupts ();
  DisableInterrupts ();
}

/**
  Requests CPU to pause for a short period of time.

  Requests CPU to pause for a short period of time. Typically used in MP
  systems to prevent memory starvation while waiting for a spin lock.

**/
VOID
EFIAPI
CpuPause (
  VOID
  )
{
}