UefiCpuPkg/CpuDxe: Enable protection for newly added page table

[mirror_edk2.git] / UefiCpuPkg / CpuDxe / Ia32 / CpuAsm.S

#------------------------------------------------------------------------------\r
#*\r
#*   Copyright (c) 2006 - 2013, 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
#*    CpuAsm.S\r
#*\r
#*   Abstract:\r
#*\r
#------------------------------------------------------------------------------\r
\r
\r
#.MMX\r
#.XMM\r
\r
#------------------------------------------------------------------------------\r
# VOID\r
# SetCodeSelector (\r
#   UINT16 Selector\r
#   );\r
#------------------------------------------------------------------------------\r
ASM_GLOBAL ASM_PFX(SetCodeSelector)\r
ASM_PFX(SetCodeSelector):\r
    movl    4(%esp), %ecx\r
    subl    $0x10, %esp \r
    leal    setCodeSelectorLongJump, %eax \r
    movl    %eax, (%esp)\r
    movw    %cx, 4(%esp)\r
    .byte   0xFF, 0x2C, 0x24   # jmp *(%esp)  note:(FWORD jmp) \r
setCodeSelectorLongJump:\r
    addl    $0x10, %esp \r
    ret\r
\r
#------------------------------------------------------------------------------\r
# VOID\r
# SetDataSelectors (\r
#   UINT16 Selector\r
#   );\r
#------------------------------------------------------------------------------\r
ASM_GLOBAL ASM_PFX(SetDataSelectors)\r
ASM_PFX(SetDataSelectors):\r
    movl    4(%esp), %ecx\r
    movw    %cx, %ss\r
    movw    %cx, %ds\r
    movw    %cx, %es\r
    movw    %cx, %fs\r
    movw    %cx, %gs\r
    ret\r
\r
#END\r
\r