SECTION .text
; INT32
; EFIAPI
; TestAndClearBit (
; IN INT32 Bit,
; IN volatile VOID* Address
; );
global ASM_PFX(TestAndClearBit)
ASM_PFX(TestAndClearBit):
mov ecx, [esp + 4]
mov edx, [esp + 8]
lock btr [edx], ecx
sbb eax, eax
ret