UefiCpuPkg/CpuDxe/X64/CpuAsm.asm

   1       TITLE   CpuAsm.asm:
   2 ;------------------------------------------------------------------------------
   3 ;*
   4 ;*   Copyright (c) 2008 - 2013, Intel Corporation. All rights reserved.<BR>
   5 ;*   This program and the accompanying materials
   6 ;*   are licensed and made available under the terms and conditions of the BSD License
   7 ;*   which accompanies this distribution.  The full text of the license may be found at
   8 ;*   http://opensource.org/licenses/bsd-license.php
   9 ;*
  10 ;*   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 ;*   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 ;*
  13 ;*    CpuAsm.asm
  14 ;*
  15 ;*   Abstract:
  16 ;*
  17 ;------------------------------------------------------------------------------
  18
  19     .code
  20
  21 ;------------------------------------------------------------------------------
  22 ; VOID
  23 ; SetCodeSelector (
  24 ;   UINT16 Selector
  25 ;   );
  26 ;------------------------------------------------------------------------------
  27 SetCodeSelector PROC PUBLIC
  28     sub     rsp, 0x10
  29     lea     rax, setCodeSelectorLongJump
  30     mov     [rsp], rax
  31     mov     [rsp+4], cx
  32     jmp     fword ptr [rsp]
  33 setCodeSelectorLongJump:
  34     add     rsp, 0x10
  35     ret
  36 SetCodeSelector ENDP
  37
  38 ;------------------------------------------------------------------------------
  39 ; VOID
  40 ; SetDataSelectors (
  41 ;   UINT16 Selector
  42 ;   );
  43 ;------------------------------------------------------------------------------
  44 SetDataSelectors PROC PUBLIC
  45     mov     ss, cx
  46     mov     ds, cx
  47     mov     es, cx
  48     mov     fs, cx
  49     mov     gs, cx
  50     ret
  51 SetDataSelectors ENDP
  52
  53 END
  54