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 %include "StuffRsb.inc"
23 extern ASM_PFX(SmmInitHandler)
24 extern ASM_PFX(mRebasedFlag)
25 extern ASM_PFX(mSmmRelocationOriginalAddress)
27 global ASM_PFX(gPatchSmmCr3)
28 global ASM_PFX(gPatchSmmCr4)
29 global ASM_PFX(gPatchSmmCr0)
30 global ASM_PFX(gPatchSmmInitStack)
31 global ASM_PFX(gcSmiInitGdtr)
32 global ASM_PFX(gcSmmInitSize)
33 global ASM_PFX(gcSmmInitTemplate)
35 %define PROTECT_MODE_CS 0x8
36 %define PROTECT_MODE_DS 0x20
40 ASM_PFX(gcSmiInitGdtr):
44 global ASM_PFX(SmmStartup)
48 mov eax, 0x80000001 ; read capability
50 mov ebx, edx ; rdmsr will change edx. keep it in ebx.
51 and ebx, BIT20 ; extract NX capability bit
52 shr ebx, 9 ; shift bit to IA32_EFER.NXE[BIT11] position
53 mov eax, strict dword 0 ; source operand will be patched
54 ASM_PFX(gPatchSmmCr3):
56 o32 lgdt [cs:ebp + (ASM_PFX(gcSmiInitGdtr) - ASM_PFX(SmmStartup))]
57 mov eax, strict dword 0 ; source operand will be patched
58 ASM_PFX(gPatchSmmCr4):
60 mov ecx, 0xc0000080 ; IA32_EFER MSR
62 or eax, ebx ; set NXE bit if NX is available
64 mov eax, strict dword 0 ; source operand will be patched
65 ASM_PFX(gPatchSmmCr0):
66 mov di, PROTECT_MODE_DS
68 jmp PROTECT_MODE_CS : dword @32bit
77 mov esp, strict dword 0 ; source operand will be patched
78 ASM_PFX(gPatchSmmInitStack):
79 call ASM_PFX(SmmInitHandler)
84 ASM_PFX(gcSmmInitTemplate):
85 mov ebp, ASM_PFX(SmmStartup)
89 ASM_PFX(gcSmmInitSize): DW $ - ASM_PFX(gcSmmInitTemplate)
92 global ASM_PFX(SmmRelocationSemaphoreComplete)
93 ASM_PFX(SmmRelocationSemaphoreComplete):
95 mov eax, [ASM_PFX(mRebasedFlag)]
98 jmp [ASM_PFX(mSmmRelocationOriginalAddress)]
100 global ASM_PFX(PiSmmCpuSmmInitFixupAddress)
101 ASM_PFX(PiSmmCpuSmmInitFixupAddress):