;------------------------------------------------------------------------------\r
;\r
-; Copyright (c) 2006, Intel Corporation\r
-; All rights reserved. This program and the accompanying materials\r
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r
+; This program and the accompanying materials\r
; are licensed and made available under the terms and conditions of the BSD License\r
; which accompanies this distribution. The full text of the license may be found at\r
; http://opensource.org/licenses/bsd-license.php\r
;------------------------------------------------------------------------------\r
\r
.586p\r
- .model flat\r
+ .model flat,C\r
.code\r
\r
;------------------------------------------------------------------------------\r
-; VOID\r
+; UINTN\r
; EFIAPI\r
; AsmWriteDr4 (\r
; IN UINTN Value\r
; );\r
;------------------------------------------------------------------------------\r
-_AsmWriteDr4 PROC\r
+AsmWriteDr4 PROC\r
mov eax, [esp + 4]\r
+ ;\r
+ ; DR4 is alias to DR6 only if DE (in CR4) is cleared. Otherwise, writing to\r
+ ; this register will cause a #UD exception.\r
+ ;\r
+ ; MS assembler doesn't support this instruction since no one would use it\r
+ ; under normal circustances. Here opcode is used.\r
+ ;\r
DB 0fh, 23h, 0e0h\r
ret\r
-_AsmWriteDr4 ENDP\r
+AsmWriteDr4 ENDP\r
\r
END\r