/** @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
|
)
|
{
|
}
|
|
