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1 | ;------------------------------------------------------------------------------ ;\r | |
2 | ; Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
3 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
4 | ;\r | |
5 | ; Module Name:\r | |
6 | ;\r | |
7 | ; SmiException.nasm\r | |
8 | ;\r | |
9 | ; Abstract:\r | |
10 | ;\r | |
11 | ; Exception handlers used in SM mode\r | |
12 | ;\r | |
13 | ;-------------------------------------------------------------------------------\r | |
14 | \r | |
15 | %include "StuffRsbNasm.inc"\r | |
16 | \r | |
17 | global ASM_PFX(gcStmPsd)\r | |
18 | \r | |
19 | extern ASM_PFX(SmmStmExceptionHandler)\r | |
20 | extern ASM_PFX(SmmStmSetup)\r | |
21 | extern ASM_PFX(SmmStmTeardown)\r | |
22 | extern ASM_PFX(gStmXdSupported)\r | |
23 | extern ASM_PFX(gStmSmiHandlerIdtr)\r | |
24 | \r | |
25 | %define MSR_IA32_MISC_ENABLE 0x1A0\r | |
26 | %define MSR_EFER 0xc0000080\r | |
27 | %define MSR_EFER_XD 0x800\r | |
28 | \r | |
29 | CODE_SEL equ 0x08\r | |
30 | DATA_SEL equ 0x20\r | |
31 | TSS_SEL equ 0x40\r | |
32 | \r | |
33 | SECTION .data\r | |
34 | \r | |
35 | ASM_PFX(gcStmPsd):\r | |
36 | DB 'TXTPSSIG'\r | |
37 | DW PSD_SIZE\r | |
38 | DW 1 ; Version\r | |
39 | DD 0 ; LocalApicId\r | |
40 | DB 0x05 ; Cr4Pse;Cr4Pae;Intel64Mode;ExecutionDisableOutsideSmrr\r | |
41 | DB 0 ; BIOS to STM\r | |
42 | DB 0 ; STM to BIOS\r | |
43 | DB 0\r | |
44 | DW CODE_SEL\r | |
45 | DW DATA_SEL\r | |
46 | DW DATA_SEL\r | |
47 | DW DATA_SEL\r | |
48 | DW TSS_SEL\r | |
49 | DW 0\r | |
50 | DQ 0 ; SmmCr3\r | |
51 | DD ASM_PFX(OnStmSetup)\r | |
52 | DD 0\r | |
53 | DD ASM_PFX(OnStmTeardown)\r | |
54 | DD 0\r | |
55 | DQ 0 ; SmmSmiHandlerRip - SMM guest entrypoint\r | |
56 | DQ 0 ; SmmSmiHandlerRsp\r | |
57 | DQ 0\r | |
58 | DD 0\r | |
59 | DD 0x80010100 ; RequiredStmSmmRevId\r | |
60 | DD ASM_PFX(OnException)\r | |
61 | DD 0\r | |
62 | DQ 0 ; ExceptionStack\r | |
63 | DW DATA_SEL\r | |
64 | DW 0x01F ; ExceptionFilter\r | |
65 | DD 0\r | |
66 | DD 0\r | |
67 | DD 0\r | |
68 | DQ 0 ; BiosHwResourceRequirementsPtr\r | |
69 | DQ 0 ; AcpiRsdp\r | |
70 | DB 0 ; PhysicalAddressBits\r | |
71 | PSD_SIZE equ $ - ASM_PFX(gcStmPsd)\r | |
72 | \r | |
73 | SECTION .text\r | |
74 | ;------------------------------------------------------------------------------\r | |
75 | ; SMM Exception handlers\r | |
76 | ;------------------------------------------------------------------------------\r | |
77 | global ASM_PFX(OnException)\r | |
78 | ASM_PFX(OnException):\r | |
79 | mov ecx, esp\r | |
80 | push ecx\r | |
81 | call ASM_PFX(SmmStmExceptionHandler)\r | |
82 | add esp, 4\r | |
83 | \r | |
84 | mov ebx, eax\r | |
85 | mov eax, 4\r | |
86 | vmcall\r | |
87 | jmp $\r | |
88 | \r | |
89 | global ASM_PFX(OnStmSetup)\r | |
90 | ASM_PFX(OnStmSetup):\r | |
91 | ;\r | |
92 | ; Check XD disable bit\r | |
93 | ;\r | |
94 | xor esi, esi\r | |
95 | mov eax, ASM_PFX(gStmXdSupported)\r | |
96 | mov al, [eax]\r | |
97 | cmp al, 0\r | |
98 | jz @StmXdDone1\r | |
99 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
100 | rdmsr\r | |
101 | mov esi, edx ; save MSR_IA32_MISC_ENABLE[63-32]\r | |
102 | test edx, BIT2 ; MSR_IA32_MISC_ENABLE[34]\r | |
103 | jz .51\r | |
104 | and dx, 0xFFFB ; clear XD Disable bit if it is set\r | |
105 | wrmsr\r | |
106 | .51:\r | |
107 | mov ecx, MSR_EFER\r | |
108 | rdmsr\r | |
109 | or ax, MSR_EFER_XD ; enable NXE\r | |
110 | wrmsr\r | |
111 | @StmXdDone1:\r | |
112 | push esi\r | |
113 | \r | |
114 | call ASM_PFX(SmmStmSetup)\r | |
115 | \r | |
116 | mov eax, ASM_PFX(gStmXdSupported)\r | |
117 | mov al, [eax]\r | |
118 | cmp al, 0\r | |
119 | jz .71\r | |
120 | pop edx ; get saved MSR_IA32_MISC_ENABLE[63-32]\r | |
121 | test edx, BIT2\r | |
122 | jz .71\r | |
123 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
124 | rdmsr\r | |
125 | or dx, BIT2 ; set XD Disable bit if it was set before entering into SMM\r | |
126 | wrmsr\r | |
127 | \r | |
128 | .71:\r | |
129 | StuffRsb32\r | |
130 | rsm\r | |
131 | \r | |
132 | global ASM_PFX(OnStmTeardown)\r | |
133 | ASM_PFX(OnStmTeardown):\r | |
134 | ;\r | |
135 | ; Check XD disable bit\r | |
136 | ;\r | |
137 | xor esi, esi\r | |
138 | mov eax, ASM_PFX(gStmXdSupported)\r | |
139 | mov al, [eax]\r | |
140 | cmp al, 0\r | |
141 | jz @StmXdDone2\r | |
142 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
143 | rdmsr\r | |
144 | mov esi, edx ; save MSR_IA32_MISC_ENABLE[63-32]\r | |
145 | test edx, BIT2 ; MSR_IA32_MISC_ENABLE[34]\r | |
146 | jz .52\r | |
147 | and dx, 0xFFFB ; clear XD Disable bit if it is set\r | |
148 | wrmsr\r | |
149 | .52:\r | |
150 | mov ecx, MSR_EFER\r | |
151 | rdmsr\r | |
152 | or ax, MSR_EFER_XD ; enable NXE\r | |
153 | wrmsr\r | |
154 | @StmXdDone2:\r | |
155 | push esi\r | |
156 | \r | |
157 | call ASM_PFX(SmmStmTeardown)\r | |
158 | \r | |
159 | mov eax, ASM_PFX(gStmXdSupported)\r | |
160 | mov al, [eax]\r | |
161 | cmp al, 0\r | |
162 | jz .72\r | |
163 | pop edx ; get saved MSR_IA32_MISC_ENABLE[63-32]\r | |
164 | test edx, BIT2\r | |
165 | jz .72\r | |
166 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
167 | rdmsr\r | |
168 | or dx, BIT2 ; set XD Disable bit if it was set before entering into SMM\r | |
169 | wrmsr\r | |
170 | \r | |
171 | .72:\r | |
172 | StuffRsb32\r | |
173 | rsm\r |