MdePkg/BaseLib: Add stack switch related definitions for IA32

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / WriteTr.nasm

diff --git a/MdePkg/Library/BaseLib/Ia32/WriteTr.nasm b/MdePkg/Library/BaseLib/Ia32/WriteTr.nasm
new file mode 100644 (file)
index 0000000..cde5a3a
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/WriteTr.nasm
@@ -0,0 +1,36 @@
+;------------------------------------------------------------------------------ ;\r
+; Copyright (c) 2017, 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
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+;\r
+; Module Name:\r
+;\r
+;   WriteTr.nasm\r
+;\r
+; Abstract:\r
+;\r
+;   Write TR register\r
+;\r
+; Notes:\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    SECTION .text\r
+\r
+;------------------------------------------------------------------------------\r
+; VOID\r
+; AsmWriteTr (\r
+;   UINT16 Selector\r
+;   );\r
+;------------------------------------------------------------------------------\r
+global ASM_PFX(AsmWriteTr)\r
+ASM_PFX(AsmWriteTr):\r
+    mov     eax, [esp+4]\r
+    ltr     ax\r
+    ret\r
+\r