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ArmPkg/CpuDxe: Register a callback for the gIdleLoopEventGuid event 

This gIdleLoopEventGuid event signals the Cpu that it should go into
the idle state waiting for any events.
CpuSleep() is used in this implementation to make the Cpu wait for
the next interrupt (WFI instruction).



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11863 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
oliviermartin 2011-06-20 21:35:50 +00:00
parent 149daa615f
commit 8513037f2c
2 changed files with 38 additions and 2 deletions
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36
ArmPkg/Drivers/CpuDxe/CpuDxe.c
View File

@ -1,6 +1,7 @@
/** @file /** @file
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR> Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Copyright (c) 2011, ARM Limited. All rights reserved.
This program and the accompanying materials This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License are licensed and made available under the terms and conditions of the BSD License
@ -14,6 +15,8 @@
#include "CpuDxe.h" #include "CpuDxe.h"
#include <Guid/IdleLoopEvent.h>
BOOLEAN mInterruptState = FALSE; BOOLEAN mInterruptState = FALSE;
@ -194,6 +197,23 @@ CpuGetTimerValue (
return EFI_UNSUPPORTED; return EFI_UNSUPPORTED;
} }
/**
Callback function for idle events.
@param Event Event whose notification function is being invoked.
@param Context The pointer to the notification function's context,
which is implementation-dependent.
**/
VOID
EFIAPI
IdleLoopEventCallback (
IN EFI_EVENT Event,
IN VOID *Context
)
{
CpuSleep ();
}
// //
// Globals used to initialize the protocol // Globals used to initialize the protocol
@ -219,10 +239,10 @@ CpuDxeInitialize (
) )
{ {
EFI_STATUS Status; EFI_STATUS Status;
EFI_EVENT IdleLoopEvent;
InitializeExceptions (&mCpu); InitializeExceptions (&mCpu);
Status = gBS->InstallMultipleProtocolInterfaces ( Status = gBS->InstallMultipleProtocolInterfaces (
&mCpuHandle, &mCpuHandle,
&gEfiCpuArchProtocolGuid, &mCpu, &gEfiCpuArchProtocolGuid, &mCpu,
@ -237,6 +257,18 @@ CpuDxeInitialize (
// //
SyncCacheConfig (&mCpu); SyncCacheConfig (&mCpu);
//
// Setup a callback for idle events
//
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_NOTIFY,
IdleLoopEventCallback,
NULL,
&gIdleLoopEventGuid,
&IdleLoopEvent
);
ASSERT_EFI_ERROR (Status);
return Status; return Status;
} }

4
ArmPkg/Drivers/CpuDxe/CpuDxe.inf
View File

@ -3,6 +3,8 @@
# DXE CPU driver # DXE CPU driver
# #
# Copyright (c) 2009, Apple Inc. All rights reserved.<BR> # Copyright (c) 2009, Apple Inc. All rights reserved.<BR>
# Copyright (c) 2011, ARM Limited. All rights reserved.
#
# This program and the accompanying materials # This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License # are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at # which accompanies this distribution. The full text of the license may be found at
@ -45,6 +47,7 @@
ArmPkg/ArmPkg.dec ArmPkg/ArmPkg.dec
EmbeddedPkg/EmbeddedPkg.dec EmbeddedPkg/EmbeddedPkg.dec
MdePkg/MdePkg.dec MdePkg/MdePkg.dec
MdeModulePkg/MdeModulePkg.dec
[LibraryClasses] [LibraryClasses]
BaseMemoryLib BaseMemoryLib
@ -65,6 +68,7 @@
[Guids] [Guids]
gEfiDebugImageInfoTableGuid gEfiDebugImageInfoTableGuid
gIdleLoopEventGuid
[Pcd.common] [Pcd.common]
gArmTokenSpaceGuid.PcdVFPEnabled gArmTokenSpaceGuid.PcdVFPEnabled