f9d30595ae
Load new GDT table and update segment accordingly. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan <jeff.fan@intel.com> Reviewed-by: Feng Tian <feng.tian@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17988 6f19259b-4bc3-4df7-8a09-765794883524
51 lines
1.4 KiB
NASM
51 lines
1.4 KiB
NASM
;------------------------------------------------------------------------------ ;
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; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php.
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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; Module Name:
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;
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; MpFuncs.nasm
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;
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; Abstract:
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;
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; This is the assembly code for MP support
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;
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;-------------------------------------------------------------------------------
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%include "MpEqu.inc"
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DEFAULT REL
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SECTION .text
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global ASM_PFX(AsmInitializeGdt)
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ASM_PFX(AsmInitializeGdt):
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push rbp
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mov rbp, rsp
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lgdt [rcx] ; update the GDTR
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sub rsp, 0x10
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mov rax, ASM_PFX(SetCodeSelectorFarJump)
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mov [rsp], rax
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mov rdx, LONG_MODE_CS
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mov [rsp + 4], dx ; get new CS
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jmp far dword [rsp] ; far jump with new CS
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ASM_PFX(SetCodeSelectorFarJump):
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add rsp, 0x10
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mov rax, LONG_MODE_DS ; get new DS
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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pop rbp
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ret
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