diff options
Diffstat (limited to 'OvmfPkg/XenBusDxe/X64/TestAndClearBit.asm')
| -rw-r--r-- | OvmfPkg/XenBusDxe/X64/TestAndClearBit.asm | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/OvmfPkg/XenBusDxe/X64/TestAndClearBit.asm b/OvmfPkg/XenBusDxe/X64/TestAndClearBit.asm new file mode 100644 index 0000000000..3a2587913e --- /dev/null +++ b/OvmfPkg/XenBusDxe/X64/TestAndClearBit.asm @@ -0,0 +1,16 @@ +.code
+
+; INT32
+; EFIAPI
+; TestAndClearBit (
+; IN INT32 Bit, // rcx
+; IN volatile VOID* Address // rdx
+; );
+TestAndClearBit PROC
+ lock
+ btr [rdx], ecx
+ sbb eax, eax
+ ret
+TestAndClearBit ENDP
+
+END
|