Revision: 16025
http://sourceforge.net/p/edk2/code/16025
Author: jljusten
Date: 2014-09-01 17:24:08 +0000 (Mon, 01 Sep 2014)
Log Message:
-----------
MdePkg BaseLib NASM Thunk16: Initialize _16GdtrBase to 0
Previously we were setting it to the start of the GDT in the UEFI
driver's copy of BaseLib. This address is irrelavent, since the C code
will initialize it to the cooresponding address after the Thunk16 code
has been placed in low memory.
Additionally, initializing this was causing a link error for the
XCLANG toolchain.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <[email protected]>
Reviewed-by: Liming Gao <[email protected]>
Modified Paths:
--------------
trunk/edk2/MdePkg/Library/BaseLib/Ia32/Thunk16.nasm
trunk/edk2/MdePkg/Library/BaseLib/X64/Thunk16.nasm
Modified: trunk/edk2/MdePkg/Library/BaseLib/Ia32/Thunk16.nasm
===================================================================
--- trunk/edk2/MdePkg/Library/BaseLib/Ia32/Thunk16.nasm 2014-09-01 17:23:57 UTC
(rev 16024)
+++ trunk/edk2/MdePkg/Library/BaseLib/Ia32/Thunk16.nasm 2014-09-01 17:24:08 UTC
(rev 16025)
@@ -139,7 +139,7 @@
_16Gdtr:
DW GdtEnd - _NullSegDesc - 1
_16GdtrBase:
- DD _NullSegDesc
+ DD 0
;------------------------------------------------------------------------------
; _ToUserCode() takes control in real mode before passing control to user code.
Modified: trunk/edk2/MdePkg/Library/BaseLib/X64/Thunk16.nasm
===================================================================
--- trunk/edk2/MdePkg/Library/BaseLib/X64/Thunk16.nasm 2014-09-01 17:23:57 UTC
(rev 16024)
+++ trunk/edk2/MdePkg/Library/BaseLib/X64/Thunk16.nasm 2014-09-01 17:24:08 UTC
(rev 16025)
@@ -145,7 +145,7 @@
_16Gdtr:
DW GDT_SIZE - 1
_16GdtrBase:
- DQ _NullSeg
+ DQ 0
_16Idtr:
DW (1 << 10) - 1
DD 0
------------------------------------------------------------------------------
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