2009-08-19 16:02:07 +02:00
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/** @file
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GCC inline implementation of BaseLib processor specific functions.
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Copyright (c) 2006 - 2007, Intel Corporation<BR>
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Portions copyright (c) 2008-2009 Apple Inc.<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "BaseLibInternals.h"
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/**
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Requests CPU to pause for a short period of time.
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Requests CPU to pause for a short period of time. Typically used in MP
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systems to prevent memory starvation while waiting for a spin lock.
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**/
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VOID
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EFIAPI
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CpuPause (
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VOID
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)
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{
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__asm__ __volatile__ (
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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);
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}
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VOID
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EFIAPI
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InternalSwitchStackAsm (
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SWITCH_STACK_ENTRY_POINT EntryPoint,
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VOID *Context,
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VOID *Context2,
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VOID *NewStack
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)
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{
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__asm__ __volatile__ (
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"mov lr, %0\n\t"
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"mov sp, %3\n\t"
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"mov %r0, %1\n\t"
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"mov %r1, %2\n\t"
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"bx lr\n\t"
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: /* no output operand */
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: "r" (EntryPoint),
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"r" (Context),
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"r" (Context2),
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"r" (NewStack)
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);
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}
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