diff options
Diffstat (limited to 'UefiCpuPkg/CpuMpPei/X64/MpFuncs.asm')
| -rw-r--r-- | UefiCpuPkg/CpuMpPei/X64/MpFuncs.asm | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/UefiCpuPkg/CpuMpPei/X64/MpFuncs.asm b/UefiCpuPkg/CpuMpPei/X64/MpFuncs.asm new file mode 100644 index 0000000000..13a7b5f430 --- /dev/null +++ b/UefiCpuPkg/CpuMpPei/X64/MpFuncs.asm @@ -0,0 +1,51 @@ +;------------------------------------------------------------------------------ ; +; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR> +; This program and the accompanying materials +; are licensed and made available under the terms and conditions of the BSD License +; which accompanies this distribution. The full text of the license may be found at +; http://opensource.org/licenses/bsd-license.php. +; +; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +; +; Module Name: +; +; MpFuncs32.asm +; +; Abstract: +; +; This is the assembly code for MP support +; +;------------------------------------------------------------------------------- + +include MpEqu.inc +.code + + +AsmInitializeGdt PROC + push rbp + mov rbp, rsp + + lgdt fword PTR [rcx] ; update the GDTR + + sub rsp, 0x10 + lea rax, SetCodeSelectorFarJump + mov [rsp], rax + mov rdx, LONG_MODE_CS + mov [rsp + 4], dx ; get new CS + jmp fword ptr [rsp] +SetCodeSelectorFarJump: + add rsp, 0x10 + + mov rax, LONG_MODE_DS ; get new DS + mov ds, ax + mov es, ax + mov fs, ax + mov gs, ax + mov ss, ax + + pop rbp + ret +AsmInitializeGdt ENDP + +END |