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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
This commit is contained in:
li-elvin 2012-10-31 08:58:27 +00:00
parent 25bc832666
commit 4fde0f15aa
1 changed files with 5 additions and 1 deletions
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6
PcAtChipsetPkg/8259InterruptControllerDxe/8259.c
View File

@ -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;
}