1;------------------------------------------------------------------------------ ;
2; Copyright (c) 2016, 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.nasm
14;
15; Abstract:
16;
17;   Functions for relocating SMBASE's for all processors
18;
19;-------------------------------------------------------------------------------
20
21extern ASM_PFX(SmmInitHandler)
22extern ASM_PFX(mRebasedFlag)
23extern ASM_PFX(mSmmRelocationOriginalAddress)
24
25global ASM_PFX(gSmmCr3)
26global ASM_PFX(gSmmCr4)
27global ASM_PFX(gSmmCr0)
28global ASM_PFX(gSmmJmpAddr)
29global ASM_PFX(gSmmInitStack)
30global ASM_PFX(gcSmiInitGdtr)
31global ASM_PFX(gcSmmInitSize)
32global ASM_PFX(gcSmmInitTemplate)
33
34%define PROTECT_MODE_CS 0x8
35%define PROTECT_MODE_DS 0x20
36
37    SECTION .text
38
39ASM_PFX(gcSmiInitGdtr):
40            DW      0
41            DQ      0
42
43global ASM_PFX(SmmStartup)
44ASM_PFX(SmmStartup):
45    DB      0x66, 0xb8
46ASM_PFX(gSmmCr3): DD 0
47    mov     cr3, eax
48    DB      0x67, 0x66
49    lgdt    [cs:ebp + (ASM_PFX(gcSmiInitGdtr) - ASM_PFX(SmmStartup))]
50    DB      0x66, 0xb8
51ASM_PFX(gSmmCr4): DD 0
52    mov     cr4, eax
53    DB      0x66, 0xb8
54ASM_PFX(gSmmCr0): DD 0
55    DB      0xbf, PROTECT_MODE_DS, 0    ; mov di, PROTECT_MODE_DS
56    mov     cr0, eax
57    DB      0x66, 0xea                   ; jmp far [ptr48]
58ASM_PFX(gSmmJmpAddr):
59    DD      @32bit
60    DW      PROTECT_MODE_CS
61@32bit:
62    mov     ds, edi
63    mov     es, edi
64    mov     fs, edi
65    mov     gs, edi
66    mov     ss, edi
67    DB      0xbc                        ; mov esp, imm32
68ASM_PFX(gSmmInitStack): DD 0
69    call    ASM_PFX(SmmInitHandler)
70    rsm
71
72BITS 16
73ASM_PFX(gcSmmInitTemplate):
74    mov ebp, ASM_PFX(SmmStartup)
75    sub ebp, 0x30000
76    jmp ebp
77
78ASM_PFX(gcSmmInitSize): DW $ - ASM_PFX(gcSmmInitTemplate)
79
80BITS 32
81global ASM_PFX(SmmRelocationSemaphoreComplete)
82ASM_PFX(SmmRelocationSemaphoreComplete):
83    push    eax
84    mov     eax, [ASM_PFX(mRebasedFlag)]
85    mov     byte [eax], 1
86    pop     eax
87    jmp     [ASM_PFX(mSmmRelocationOriginalAddress)]
88