1 ;------------------------------------------------------------------------------ ; 2 ; Copyright (c) 2009 - 2015, 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. 7 ; 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. 10 ; 11 ; Module Name: 12 ; 13 ; SmmInit.Asm 14 ; 15 ; Abstract: 16 ; 17 ; Functions for relocating SMBASE's for all processors 18 ; 19 ;------------------------------------------------------------------------------- 20 21 EXTERNDEF SmmInitHandler:PROC 22 EXTERNDEF gSmmCr0:DWORD 23 EXTERNDEF gSmmCr3:DWORD 24 EXTERNDEF gSmmCr4:DWORD 25 EXTERNDEF gSmmJmpAddr:QWORD 26 EXTERNDEF gcSmmInitTemplate:BYTE 27 EXTERNDEF gcSmmInitSize:WORD 28 EXTERNDEF mRebasedFlag:PTR BYTE 29 EXTERNDEF mSmmRelocationOriginalAddress:QWORD 30 EXTERNDEF mRebasedFlagAddr32:DWORD 31 EXTERNDEF mSmmRelocationOriginalAddressPtr32:DWORD 32 EXTERNDEF gSmmInitStack:QWORD 33 EXTERNDEF gcSmiInitGdtr:FWORD 34 35 .code 36 37 gcSmiInitGdtr LABEL FWORD 38 DW 0 39 DQ 0 40 41 SmmStartup PROC 42 DB 66h, 0b8h ; mov eax, imm32 43 gSmmCr3 DD ? 44 mov cr3, rax 45 DB 66h, 2eh 46 lgdt fword ptr [ebp + (offset gcSmiInitGdtr - SmmStartup)] 47 DB 66h, 0b8h ; mov eax, imm32 48 gSmmCr4 DD ? 49 or ah, 2 ; enable XMM registers access 50 mov cr4, rax 51 DB 66h 52 mov ecx, 0c0000080h ; IA32_EFER MSR 53 rdmsr 54 or ah, 1 ; set LME bit 55 wrmsr 56 DB 66h, 0b8h ; mov eax, imm32 57 gSmmCr0 DD ? 58 mov cr0, rax ; enable protected mode & paging 59 DB 66h, 0eah ; far jmp to long mode 60 gSmmJmpAddr DQ @LongMode 61 @LongMode: ; long-mode starts here 62 DB 48h, 0bch ; mov rsp, imm64 63 gSmmInitStack DQ ? 64 and sp, 0fff0h ; make sure RSP is 16-byte aligned 65 ; 66 ; Accoring to X64 calling convention, XMM0~5 are volatile, we need to save 67 ; them before calling C-function. 68 ; 69 sub rsp, 60h 70 movdqa [rsp], xmm0 71 movdqa [rsp + 10h], xmm1 72 movdqa [rsp + 20h], xmm2 73 movdqa [rsp + 30h], xmm3 74 movdqa [rsp + 40h], xmm4 75 movdqa [rsp + 50h], xmm5 76 77 add rsp, -20h 78 call SmmInitHandler 79 add rsp, 20h 80 81 ; 82 ; Restore XMM0~5 after calling C-function. 83 ; 84 movdqa xmm0, [rsp] 85 movdqa xmm1, [rsp + 10h] 86 movdqa xmm2, [rsp + 20h] 87 movdqa xmm3, [rsp + 30h] 88 movdqa xmm4, [rsp + 40h] 89 movdqa xmm5, [rsp + 50h] 90 91 rsm 92 SmmStartup ENDP 93 94 gcSmmInitTemplate LABEL BYTE 95 96 _SmmInitTemplate PROC 97 DB 66h, 2eh, 8bh, 2eh ; mov ebp, cs:[@F] 98 DW @L1 - _SmmInitTemplate + 8000h 99 DB 66h, 81h, 0edh, 00h, 00h, 03h, 00 ; sub ebp, 30000h 100 jmp bp ; jmp ebp actually 101 @L1: 102 DQ SmmStartup 103 _SmmInitTemplate ENDP 104 105 gcSmmInitSize DW $ - gcSmmInitTemplate 106 107 SmmRelocationSemaphoreComplete PROC 108 push rax 109 mov rax, mRebasedFlag 110 mov byte ptr [rax], 1 111 pop rax 112 jmp [mSmmRelocationOriginalAddress] 113 SmmRelocationSemaphoreComplete ENDP 114 115 ; 116 ; Semaphore code running in 32-bit mode 117 ; 118 SmmRelocationSemaphoreComplete32 PROC 119 ; 120 ; mov byte ptr [], 1 121 ; 122 db 0c6h, 05h 123 mRebasedFlagAddr32 dd 0 124 db 1 125 ; 126 ; jmp dword ptr [] 127 ; 128 db 0ffh, 25h 129 mSmmRelocationOriginalAddressPtr32 dd 0 130 SmmRelocationSemaphoreComplete32 ENDP 131 132 END 133
