1 ;------------------------------------------------------------------------------ ;
2 ; Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>
3 ; This program and the accompanying materials
4 ; are licensed and made available under the terms and conditions of the BSD License
5 ; which accompanies this distribution. The full text of the license may be found at
6 ; http://opensource.org/licenses/bsd-license.php.
8 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
9 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
17 ; Functions for relocating SMBASE's for all processors
19 ;-------------------------------------------------------------------------------
21 extern ASM_PFX(SmmInitHandler)
22 extern ASM_PFX(mRebasedFlag)
23 extern ASM_PFX(mSmmRelocationOriginalAddress)
25 global ASM_PFX(gPatchSmmCr3)
26 global ASM_PFX(gPatchSmmCr4)
27 global ASM_PFX(gPatchSmmCr0)
28 global ASM_PFX(gSmmInitStack)
29 global ASM_PFX(gcSmiInitGdtr)
30 global ASM_PFX(gcSmmInitSize)
31 global ASM_PFX(gcSmmInitTemplate)
33 %define PROTECT_MODE_CS 0x8
34 %define PROTECT_MODE_DS 0x20
38 ASM_PFX(gcSmiInitGdtr):
42 global ASM_PFX(SmmStartup)
46 mov eax, 0x80000001 ; read capability
48 mov ebx, edx ; rdmsr will change edx. keep it in ebx.
49 and ebx, BIT20 ; extract NX capability bit
50 shr ebx, 9 ; shift bit to IA32_EFER.NXE[BIT11] position
51 mov eax, strict dword 0 ; source operand will be patched
52 ASM_PFX(gPatchSmmCr3):
54 o32 lgdt [cs:ebp + (ASM_PFX(gcSmiInitGdtr) - ASM_PFX(SmmStartup))]
55 mov eax, strict dword 0 ; source operand will be patched
56 ASM_PFX(gPatchSmmCr4):
58 mov ecx, 0xc0000080 ; IA32_EFER MSR
60 or eax, ebx ; set NXE bit if NX is available
62 mov eax, strict dword 0 ; source operand will be patched
63 ASM_PFX(gPatchSmmCr0):
64 mov di, PROTECT_MODE_DS
66 jmp PROTECT_MODE_CS : dword @32bit
75 DB 0xbc ; mov esp, imm32
76 ASM_PFX(gSmmInitStack): DD 0
77 call ASM_PFX(SmmInitHandler)
81 ASM_PFX(gcSmmInitTemplate):
82 mov ebp, ASM_PFX(SmmStartup)
86 ASM_PFX(gcSmmInitSize): DW $ - ASM_PFX(gcSmmInitTemplate)
89 global ASM_PFX(SmmRelocationSemaphoreComplete)
90 ASM_PFX(SmmRelocationSemaphoreComplete):
92 mov eax, [ASM_PFX(mRebasedFlag)]
95 jmp [ASM_PFX(mSmmRelocationOriginalAddress)]
97 global ASM_PFX(PiSmmCpuSmmInitFixupAddress)
98 ASM_PFX(PiSmmCpuSmmInitFixupAddress):