diff options
author | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-05-02 19:55:32 +0000 |
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committer | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-05-02 19:55:32 +0000 |
commit | b1d41be7c9c0dc18cf9b73785eee6a20f13db126 (patch) | |
tree | 6cf436c0af3f6196985ef9680972a681337de484 /ArmPkg | |
parent | f463bb00ad63cdfbec22519c9ae878f43760e97d (diff) | |
download | edk2-b1d41be7c9c0dc18cf9b73785eee6a20f13db126.zip edk2-b1d41be7c9c0dc18cf9b73785eee6a20f13db126.tar.gz edk2-b1d41be7c9c0dc18cf9b73785eee6a20f13db126.tar.bz2 |
ArmPkg/ArmCpuLib: Replaced complex functions ArmCpuSynchronizeWait & ArmCpuSynchronizeSignal by sev & wfe
Previsouly the synchronization of MpCore was using the SGI (Software
Generated Interrupt) to synchronize MpCore during the early boot.
This commit replaced this mechanism by the more appropriate SEV/WFE
instructions (Send/Wait Event instructions).
That also eases the port to a new cpu/platform.
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13249 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'ArmPkg')
13 files changed, 42 insertions, 255 deletions
diff --git a/ArmPkg/Drivers/ArmCpuLib/Arm11MpCoreLib/Arm11Lib.c b/ArmPkg/Drivers/ArmCpuLib/Arm11MpCoreLib/Arm11Lib.c index 2e285d5..a08b7b1 100644 --- a/ArmPkg/Drivers/ArmCpuLib/Arm11MpCoreLib/Arm11Lib.c +++ b/ArmPkg/Drivers/ArmCpuLib/Arm11MpCoreLib/Arm11Lib.c @@ -1,6 +1,6 @@ /** @file
- Copyright (c) 2011, ARM Limited. All rights reserved.
+ Copyright (c) 2011-2012, ARM Limited. All rights reserved.
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@@ -15,76 +15,15 @@ #include <Base.h>
#include <Library/ArmLib.h>
#include <Library/ArmCpuLib.h>
-#include <Library/ArmGicLib.h>
#include <Library/IoLib.h>
#include <Library/PcdLib.h>
VOID
-ArmCpuSynchronizeSignal (
- IN ARM_CPU_SYNCHRONIZE_EVENT Event
- )
-{
- if (Event == ARM_CPU_EVENT_BOOT_MEM_INIT) {
- // Do nothing, Cortex A9 secondary cores are waiting for the SCU to be
- // enabled (done by ArmCpuSetup()) as a way to know when the Init Boot
- // Mem as been initialized
- } else {
- // Send SGI to all Secondary core to wake them up from WFI state.
- ArmGicSendSgiTo (PcdGet32(PcdGicDistributorBase), ARM_GIC_ICDSGIR_FILTER_EVERYONEELSE, 0x0E);
- }
-}
-
-VOID
-CArmCpuSynchronizeWait (
- IN ARM_CPU_SYNCHRONIZE_EVENT Event
- )
-{
- // Waiting for the SGI from the primary core
- ArmCallWFI ();
-
- // Acknowledge the interrupt and send End of Interrupt signal.
- ArmGicAcknowledgeSgiFrom (PcdGet32(PcdGicInterruptInterfaceBase), PRIMARY_CORE_ID);
-}
-
-#if 0
-VOID
-ArmEnableScu (
- VOID
- )
-{
- INTN ScuBase;
-
- ScuBase = ArmGetScuBaseAddress();
-
- // Invalidate all: write -1 to SCU Invalidate All register
- MmioWrite32(ScuBase + A9_SCU_INVALL_OFFSET, 0xffffffff);
- // Enable SCU
- MmioWrite32(ScuBase + A9_SCU_CONTROL_OFFSET, 0x1);
-}
-#endif
-
-VOID
ArmCpuSetup (
IN UINTN MpId
)
{
- /*AMP mode and SMP mode
-
- By default, the processor is in AMP mode (bit 5 reset to 0). To prevent coherent data corruption the sequence to turn on MP11 CPUs in SMP mode is:
-
- 1.Write the SCU register to change CPU mode.
- 2.Disable interrupts.
- 3.Clean and invalidate all the D-cache.
- 4.Write SMP/nAMP bit as 1.
- 5.Enable interrupts.
-
- Source: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0360e/BIHHFGEC.html
- */
-
- // If MPCore then Enable the SCU
- if (ArmIsMpCore()) {
- //ArmEnableScu ();
- }
+ ASSERT(0); //TODO: Implement me
}
@@ -93,20 +32,6 @@ ArmCpuSetupSmpNonSecure ( IN UINTN MpId
)
{
-#if 0
- INTN ScuBase;
-
- ArmSetAuxCrBit (A9_FEATURE_SMP);
-
- // Make the SCU accessible in Non Secure world
- if (IS_PRIMARY_CORE(MpId)) {
- ScuBase = ArmGetScuBaseAddress();
-
- // Allow NS access to SCU register
- MmioOr32 (ScuBase + A9_SCU_SACR_OFFSET, 0xf);
- // Allow NS access to Private Peripherals
- MmioOr32 (ScuBase + A9_SCU_SSACR_OFFSET, 0xfff);
- }
-#endif
+ ASSERT(0); //TODO: Implement me
}
diff --git a/ArmPkg/Drivers/ArmCpuLib/Arm11MpCoreLib/Arm11MpCoreLib.inf b/ArmPkg/Drivers/ArmCpuLib/Arm11MpCoreLib/Arm11MpCoreLib.inf index 2b9621c..f7ecfb0 100644 --- a/ArmPkg/Drivers/ArmCpuLib/Arm11MpCoreLib/Arm11MpCoreLib.inf +++ b/ArmPkg/Drivers/ArmCpuLib/Arm11MpCoreLib/Arm11MpCoreLib.inf @@ -1,5 +1,5 @@ #/* @file
-# Copyright (c) 2011, ARM Limited. All rights reserved.
+# Copyright (c) 2011-2012, ARM Limited. All rights reserved.
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
@@ -25,18 +25,8 @@ [LibraryClasses]
ArmLib
- ArmGicSecLib
IoLib
PcdLib
[Sources.common]
Arm11Lib.c
- Arm11Helper.asm | RVCT
- Arm11Helper.S | GCC
-
-[FixedPcd]
- gArmTokenSpaceGuid.PcdArmPrimaryCoreMask
- gArmTokenSpaceGuid.PcdArmPrimaryCore
-
- gArmTokenSpaceGuid.PcdGicDistributorBase
- gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase
diff --git a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA15Lib/ArmCortexA15Lib.c b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA15Lib/ArmCortexA15Lib.c index a3af3a8..9b64d66 100644 --- a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA15Lib/ArmCortexA15Lib.c +++ b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA15Lib/ArmCortexA15Lib.c @@ -1,6 +1,6 @@ /** @file
- Copyright (c) 2011, ARM Limited. All rights reserved.
+ Copyright (c) 2011-2012, ARM Limited. All rights reserved.
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@@ -15,7 +15,6 @@ #include <Base.h>
#include <Library/ArmLib.h>
#include <Library/ArmCpuLib.h>
-#include <Library/ArmGicLib.h>
#include <Library/ArmV7ArchTimerLib.h>
#include <Library/DebugLib.h>
#include <Library/IoLib.h>
@@ -24,33 +23,6 @@ #include <Chipset/ArmV7.h>
VOID
-ArmCpuSynchronizeSignal (
- IN ARM_CPU_SYNCHRONIZE_EVENT Event
- )
-{
- if (Event == ARM_CPU_EVENT_BOOT_MEM_INIT) {
- // Do nothing, Cortex A15 secondary cores are waiting for the GIC Distributor
- // to be enabled (done by the Sec module itself) as a way to know when the Init Boot
- // Mem as been initialized
- } else {
- // Send SGI to all Secondary core to wake them up from WFI state.
- ArmGicSendSgiTo (PcdGet32(PcdGicDistributorBase), ARM_GIC_ICDSGIR_FILTER_EVERYONEELSE, 0x0E);
- }
-}
-
-VOID
-CArmCpuSynchronizeWait (
- IN ARM_CPU_SYNCHRONIZE_EVENT Event
- )
-{
- // Waiting for the SGI from the primary core
- ArmCallWFI ();
-
- // Acknowledge the interrupt and send End of Interrupt signal.
- ArmGicAcknowledgeSgiFrom (PcdGet32(PcdGicInterruptInterfaceBase), PRIMARY_CORE_ID);
-}
-
-VOID
ArmCpuSetup (
IN UINTN MpId
)
diff --git a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA15Lib/ArmCortexA15Lib.inf b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA15Lib/ArmCortexA15Lib.inf index 69ecfb1..bcf7f6b 100644 --- a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA15Lib/ArmCortexA15Lib.inf +++ b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA15Lib/ArmCortexA15Lib.inf @@ -1,5 +1,5 @@ #/* @file
-# Copyright (c) 2011, ARM Limited. All rights reserved.
+# Copyright (c) 2011-2012, ARM Limited. All rights reserved.
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
@@ -25,14 +25,11 @@ [LibraryClasses]
ArmLib
- ArmGicSecLib
IoLib
PcdLib
[Sources.common]
ArmCortexA15Lib.c
- ArmCortexA15Helper.asm | RVCT
- ArmCortexA15Helper.S | GCC
[FeaturePcd]
@@ -40,7 +37,4 @@ gArmTokenSpaceGuid.PcdArmPrimaryCoreMask
gArmTokenSpaceGuid.PcdArmPrimaryCore
- gArmTokenSpaceGuid.PcdGicDistributorBase
- gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase
-
gArmTokenSpaceGuid.PcdArmArchTimerFreqInHz
diff --git a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA8Lib/ArmCortexA8Lib.c b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA8Lib/ArmCortexA8Lib.c index d755f68..e0ba1fa 100644 --- a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA8Lib/ArmCortexA8Lib.c +++ b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA8Lib/ArmCortexA8Lib.c @@ -20,24 +20,6 @@ #include <Chipset/ArmV7.h>
VOID
-ArmCpuSynchronizeWait (
- IN ARM_CPU_SYNCHRONIZE_EVENT Event
- )
-{
- // The CortexA8 is a Unicore CPU. We must not use Synchronization functions
- ASSERT(0);
-}
-
-VOID
-ArmCpuSynchronizeSignal (
- IN ARM_CPU_SYNCHRONIZE_EVENT Event
- )
-{
- // The CortexA8 is a Unicore CPU. We must not use Synchronization functions
- ASSERT(0);
-}
-
-VOID
ArmCpuSetup (
IN UINTN MpId
)
diff --git a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Helper.S b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Helper.S index c69c8d4..5db5861 100644 --- a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Helper.S +++ b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Helper.S @@ -1,5 +1,5 @@ //
-// Copyright (c) 2011, ARM Limited. All rights reserved.
+// Copyright (c) 2011-2012, ARM Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
@@ -18,24 +18,7 @@ .text
.align 3
-GCC_ASM_EXPORT(ArmCpuSynchronizeWait)
GCC_ASM_EXPORT(ArmGetScuBaseAddress)
-GCC_ASM_IMPORT(CArmCpuSynchronizeWait)
-
-// VOID
-// ArmCpuSynchronizeWait (
-// IN ARM_CPU_SYNCHRONIZE_EVENT Event
-// );
-ASM_PFX(ArmCpuSynchronizeWait):
- cmp r0, #ARM_CPU_EVENT_BOOT_MEM_INIT
- // The SCU enabled is the event to tell us the Init Boot Memory is initialized
- beq ASM_PFX(ArmWaitScuEnabled)
- // Case when the stack has been set up
- push {r1,lr}
- LoadConstantToReg (ASM_PFX(CArmCpuSynchronizeWait), r1)
- blx r1
- pop {r1,lr}
- bx lr
// IN None
// OUT r0 = SCU Base Address
@@ -45,14 +28,3 @@ ASM_PFX(ArmGetScuBaseAddress): // offset 0x0000 from the Private Memory Region.
mrc p15, 4, r0, c15, c0, 0
bx lr
-
-ASM_PFX(ArmWaitScuEnabled):
- // Read Configuration Base Address Register. ArmCBar cannot be called to get
- // the Configuration BAR as a stack is not necessary setup. The SCU is at the
- // offset 0x0000 from the Private Memory Region.
- mrc p15, 4, r0, c15, c0, 0
- add r0, r0, #A9_SCU_CONTROL_OFFSET
- ldr r0, [r0]
- cmp r0, #1
- bne ASM_PFX(ArmWaitScuEnabled)
- bx lr
diff --git a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Helper.asm b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Helper.asm index ef5015c..7150834 100644 --- a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Helper.asm +++ b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Helper.asm @@ -1,5 +1,5 @@ //
-// Copyright (c) 2011, ARM Limited. All rights reserved.
+// Copyright (c) 2011-2012, ARM Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
@@ -17,28 +17,11 @@ INCLUDE AsmMacroIoLib.inc
- EXPORT ArmCpuSynchronizeWait
EXPORT ArmGetScuBaseAddress
- IMPORT CArmCpuSynchronizeWait
PRESERVE8
AREA ArmCortexA9Helper, CODE, READONLY
-// VOID
-// ArmCpuSynchronizeWait (
-// IN ARM_CPU_SYNCHRONIZE_EVENT Event
-// );
-ArmCpuSynchronizeWait
- cmp r0, #ARM_CPU_EVENT_BOOT_MEM_INIT
- // The SCU enabled is the event to tell us the Init Boot Memory is initialized
- beq ArmWaitScuEnabled
- // Case when the stack has been set up
- push {r1,lr}
- LoadConstantToReg (CArmCpuSynchronizeWait, r1)
- blx r1
- pop {r1,lr}
- bx lr
-
// IN None
// OUT r0 = SCU Base Address
ArmGetScuBaseAddress
@@ -48,15 +31,4 @@ ArmGetScuBaseAddress mrc p15, 4, r0, c15, c0, 0
bx lr
-ArmWaitScuEnabled
- // Read Configuration Base Address Register. ArmCBar cannot be called to get
- // the Configuration BAR as a stack is not necessary setup. The SCU is at the
- // offset 0x0000 from the Private Memory Region.
- mrc p15, 4, r0, c15, c0, 0
- add r0, r0, #A9_SCU_CONTROL_OFFSET
- ldr r0, [r0]
- cmp r0, #1
- bne ArmWaitScuEnabled
- bx lr
-
END
diff --git a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Lib.c b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Lib.c index 7c5c3ee..324ddb5 100644 --- a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Lib.c +++ b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Lib.c @@ -1,6 +1,6 @@ /** @file
- Copyright (c) 2011, ARM Limited. All rights reserved.
+ Copyright (c) 2011-2012, ARM Limited. All rights reserved.
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@@ -15,40 +15,12 @@ #include <Base.h>
#include <Library/ArmLib.h>
#include <Library/ArmCpuLib.h>
-#include <Library/ArmGicLib.h>
#include <Library/IoLib.h>
#include <Library/PcdLib.h>
#include <Chipset/ArmCortexA9.h>
VOID
-ArmCpuSynchronizeSignal (
- IN ARM_CPU_SYNCHRONIZE_EVENT Event
- )
-{
- if (Event == ARM_CPU_EVENT_BOOT_MEM_INIT) {
- // Do nothing, Cortex A9 secondary cores are waiting for the SCU to be
- // enabled (done by ArmCpuSetup()) as a way to know when the Init Boot
- // Mem as been initialized
- } else {
- // Send SGI to all Secondary core to wake them up from WFI state.
- ArmGicSendSgiTo (PcdGet32(PcdGicDistributorBase), ARM_GIC_ICDSGIR_FILTER_EVERYONEELSE, 0x0E);
- }
-}
-
-VOID
-CArmCpuSynchronizeWait (
- IN ARM_CPU_SYNCHRONIZE_EVENT Event
- )
-{
- // Waiting for the SGI from the primary core
- ArmCallWFI ();
-
- // Acknowledge the interrupt and send End of Interrupt signal.
- ArmGicAcknowledgeSgiFrom (PcdGet32(PcdGicInterruptInterfaceBase), PRIMARY_CORE_ID);
-}
-
-VOID
ArmEnableScu (
VOID
)
diff --git a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Lib.inf b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Lib.inf index a03efd2..866736f 100644 --- a/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Lib.inf +++ b/ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Lib.inf @@ -1,5 +1,5 @@ #/* @file
-# Copyright (c) 2011, ARM Limited. All rights reserved.
+# Copyright (c) 2011-2012, ARM Limited. All rights reserved.
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
@@ -25,7 +25,6 @@ [LibraryClasses]
ArmLib
- ArmGicSecLib
IoLib
PcdLib
@@ -39,6 +38,3 @@ [FixedPcd]
gArmTokenSpaceGuid.PcdArmPrimaryCoreMask
gArmTokenSpaceGuid.PcdArmPrimaryCore
-
- gArmTokenSpaceGuid.PcdGicDistributorBase
- gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase
diff --git a/ArmPkg/Include/Library/ArmCpuLib.h b/ArmPkg/Include/Library/ArmCpuLib.h index 8de5aad..6f92b11 100644 --- a/ArmPkg/Include/Library/ArmCpuLib.h +++ b/ArmPkg/Include/Library/ArmCpuLib.h @@ -1,6 +1,6 @@ /** @file - Copyright (c) 2011, ARM Limited. All rights reserved. + Copyright (c) 2011-2012, ARM Limited. All rights reserved. This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License @@ -15,24 +15,6 @@ #ifndef __ARMCPU_LIB__ #define __ARMCPU_LIB__ -// These are #define and not enum to be used in assembly files -#define ARM_CPU_EVENT_DEFAULT 0 -#define ARM_CPU_EVENT_BOOT_MEM_INIT 1 -#define ARM_CPU_EVENT_SECURE_INIT 2 - -typedef UINTN ARM_CPU_SYNCHRONIZE_EVENT; - - -VOID -ArmCpuSynchronizeWait ( - IN ARM_CPU_SYNCHRONIZE_EVENT Event - ); - -VOID -ArmCpuSynchronizeSignal ( - IN ARM_CPU_SYNCHRONIZE_EVENT Event - ); - VOID ArmCpuSetup ( IN UINTN MpId diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h index c1d4009..9b4a036 100644 --- a/ArmPkg/Include/Library/ArmLib.h +++ b/ArmPkg/Include/Library/ArmLib.h @@ -438,6 +438,16 @@ ArmSetAuxCrBit ( VOID EFIAPI +ArmCallSEV ( + VOID + ); + +VOID +EFIAPI +ArmCallWFE ( + VOID + ); + ArmCallWFI ( VOID ); diff --git a/ArmPkg/Library/ArmLib/Common/ArmLibSupport.S b/ArmPkg/Library/ArmLib/Common/ArmLibSupport.S index d00a362..da927b9 100644 --- a/ArmPkg/Library/ArmLib/Common/ArmLibSupport.S +++ b/ArmPkg/Library/ArmLib/Common/ArmLibSupport.S @@ -1,7 +1,7 @@ #------------------------------------------------------------------------------
#
# Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
-# Copyright (c) 2011, ARM Limited. All rights reserved.
+# Copyright (c) 2011-2012, ARM Limited. All rights reserved.
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
@@ -40,6 +40,8 @@ GCC_ASM_EXPORT(ArmUpdateTranslationTableEntry) GCC_ASM_EXPORT(ArmWriteNsacr)
GCC_ASM_EXPORT(ArmWriteScr)
GCC_ASM_EXPORT(ArmWriteVMBar)
+GCC_ASM_EXPORT(ArmCallWFE)
+GCC_ASM_EXPORT(ArmCallSEV)
#------------------------------------------------------------------------------
@@ -146,4 +148,12 @@ ASM_PFX(ArmWriteVMBar): mcr p15, 0, r0, c12, c0, 1
bx lr
+ASM_PFX(ArmCallWFE):
+ wfe
+ bx lr
+
+ASM_PFX(ArmCallSEV):
+ sev
+ bx lr
+
ASM_FUNCTION_REMOVE_IF_UNREFERENCED
diff --git a/ArmPkg/Library/ArmLib/Common/ArmLibSupport.asm b/ArmPkg/Library/ArmLib/Common/ArmLibSupport.asm index b892603..186ee33 100644 --- a/ArmPkg/Library/ArmLib/Common/ArmLibSupport.asm +++ b/ArmPkg/Library/ArmLib/Common/ArmLibSupport.asm @@ -40,6 +40,8 @@ EXPORT ArmWriteNsacr
EXPORT ArmWriteScr
EXPORT ArmWriteVMBar
+ EXPORT ArmCallWFE
+ EXPORT ArmCallSEV
AREA ArmLibSupport, CODE, READONLY
@@ -146,4 +148,12 @@ ArmWriteVMBar mcr p15, 0, r0, c12, c0, 1
bx lr
+ArmCallWFE
+ wfe
+ blx lr
+
+ArmCallSEV
+ sev
+ blx lr
+
END
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