From 4fde0f15aae4489bd3973fb4698e6333c98c2b06 Mon Sep 17 00:00:00 2001
From: li-elvin <li-elvin@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Wed, 31 Oct 2012 08:58:27 +0000
Subject: [PATCH] Raise TPL to high to disable CPU interrupt before 8259 legacy
 base vector is changed, then restore TPL level at last when 8259
 initialization is done.

Signed-off-by: Li Elvin <elvin.li@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13901 6f19259b-4bc3-4df7-8a09-765794883524
---
 PcAtChipsetPkg/8259InterruptControllerDxe/8259.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/PcAtChipsetPkg/8259InterruptControllerDxe/8259.c b/PcAtChipsetPkg/8259InterruptControllerDxe/8259.c
index 447106afe9..e73a1007a2 100644
--- a/PcAtChipsetPkg/8259InterruptControllerDxe/8259.c
+++ b/PcAtChipsetPkg/8259InterruptControllerDxe/8259.c
@@ -123,8 +123,10 @@ Interrupt8259SetVectorBase (
   IN UINT8                     SlaveBase
   )
 {
-  UINT8 Mask;
+  UINT8   Mask;
+  EFI_TPL OriginalTpl;
 
+  OriginalTpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
   //
   // Set vector base for slave PIC
   //
@@ -211,6 +213,8 @@ Interrupt8259SetVectorBase (
 
   IoWrite8 (LEGACY_8259_CONTROL_REGISTER_SLAVE, LEGACY_8259_EOI);
   IoWrite8 (LEGACY_8259_CONTROL_REGISTER_MASTER, LEGACY_8259_EOI);
+  
+  gBS->RestoreTPL (OriginalTpl);
 
   return EFI_SUCCESS;
 }
-- 
2.39.2