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ArmPkg/ArmCpuLib: Replaced complex functions ArmCpuSynchronizeWait & ArmCpuSynchronizeSignal by sev & wfe

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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
This commit is contained in:
oliviermartin
2012-05-02 19:55:32 +00:00
parent f463bb00ad
commit b1d41be7c9
19 changed files with 61 additions and 274 deletions
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30
ArmPkg/Drivers/ArmCpuLib/ArmCortexA9Lib/ArmCortexA9Helper.S
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@@ -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