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1 | ;------------------------------------------------------------------------------ ;\r |
2 | ; Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>\r | |
3 | ; This program and the accompanying materials\r | |
4 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
5 | ; which accompanies this distribution. The full text of the license may be found at\r | |
6 | ; http://opensource.org/licenses/bsd-license.php.\r | |
7 | ;\r | |
8 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
9 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
10 | ;\r | |
11 | ; Module Name:\r | |
12 | ;\r | |
13 | ; SmiException.asm\r | |
14 | ;\r | |
15 | ; Abstract:\r | |
16 | ;\r | |
17 | ; Exception handlers used in SM mode\r | |
18 | ;\r | |
19 | ;-------------------------------------------------------------------------------\r | |
20 | \r | |
21 | EXTERNDEF gcStmPsd:BYTE\r | |
22 | \r | |
23 | EXTERNDEF SmmStmExceptionHandler:PROC\r | |
24 | EXTERNDEF SmmStmSetup:PROC\r | |
25 | EXTERNDEF SmmStmTeardown:PROC\r | |
26 | EXTERNDEF gStmXdSupported:BYTE\r | |
27 | \r | |
28 | CODE_SEL EQU 38h\r | |
29 | DATA_SEL EQU 20h\r | |
30 | TR_SEL EQU 40h\r | |
31 | \r | |
32 | MSR_IA32_MISC_ENABLE EQU 1A0h\r | |
33 | MSR_EFER EQU 0c0000080h\r | |
34 | MSR_EFER_XD EQU 0800h\r | |
35 | \r | |
36 | .data\r | |
37 | \r | |
38 | ;\r | |
39 | ; This structure serves as a template for all processors.\r | |
40 | ;\r | |
41 | gcStmPsd LABEL BYTE\r | |
42 | DB 'TXTPSSIG'\r | |
43 | DW PSD_SIZE\r | |
44 | DW 1 ; Version\r | |
45 | DD 0 ; LocalApicId\r | |
46 | DB 0Fh ; Cr4Pse;Cr4Pae;Intel64Mode;ExecutionDisableOutsideSmrr\r | |
47 | DB 0 ; BIOS to STM\r | |
48 | DB 0 ; STM to BIOS\r | |
49 | DB 0\r | |
50 | DW CODE_SEL\r | |
51 | DW DATA_SEL\r | |
52 | DW DATA_SEL\r | |
53 | DW DATA_SEL\r | |
54 | DW TR_SEL\r | |
55 | DW 0\r | |
56 | DQ 0 ; SmmCr3\r | |
57 | DQ _OnStmSetup\r | |
58 | DQ _OnStmTeardown\r | |
59 | DQ 0 ; SmmSmiHandlerRip - SMM guest entrypoint\r | |
60 | DQ 0 ; SmmSmiHandlerRsp\r | |
61 | DQ 0\r | |
62 | DD 0\r | |
63 | DD 80010100h ; RequiredStmSmmRevId\r | |
64 | DQ _OnException\r | |
65 | DQ 0 ; ExceptionStack\r | |
66 | DW DATA_SEL\r | |
67 | DW 01Fh ; ExceptionFilter\r | |
68 | DD 0\r | |
69 | DQ 0\r | |
70 | DQ 0 ; BiosHwResourceRequirementsPtr\r | |
71 | DQ 0 ; AcpiRsdp\r | |
72 | DB 0 ; PhysicalAddressBits\r | |
73 | PSD_SIZE = $ - offset gcStmPsd\r | |
74 | \r | |
75 | .code\r | |
76 | ;------------------------------------------------------------------------------\r | |
77 | ; SMM Exception handlers\r | |
78 | ;------------------------------------------------------------------------------\r | |
79 | _OnException PROC\r | |
80 | mov rcx, rsp\r | |
81 | add rsp, -28h\r | |
82 | call SmmStmExceptionHandler\r | |
83 | add rsp, 28h\r | |
84 | mov ebx, eax\r | |
85 | mov eax, 4\r | |
86 | DB 0fh, 01h, 0c1h ; VMCALL\r | |
87 | jmp $\r | |
88 | _OnException ENDP\r | |
89 | \r | |
90 | _OnStmSetup PROC\r | |
91 | ;\r | |
92 | ; Check XD disable bit\r | |
93 | ;\r | |
94 | xor r8, r8\r | |
95 | mov rax, offset ASM_PFX(gStmXdSupported)\r | |
96 | mov al, [rax]\r | |
97 | cmp al, 0\r | |
98 | jz @StmXdDone1\r | |
99 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
100 | rdmsr\r | |
101 | mov r8, rdx ; save MSR_IA32_MISC_ENABLE[63-32]\r | |
102 | test edx, BIT2 ; MSR_IA32_MISC_ENABLE[34]\r | |
103 | jz @f\r | |
104 | and dx, 0FFFBh ; clear XD Disable bit if it is set\r | |
105 | wrmsr\r | |
106 | @@:\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 r8\r | |
113 | \r | |
114 | add rsp, -20h\r | |
115 | call SmmStmSetup\r | |
116 | add rsp, 20h\r | |
117 | \r | |
118 | mov rax, offset ASM_PFX(gStmXdSupported)\r | |
119 | mov al, [rax]\r | |
120 | cmp al, 0\r | |
121 | jz @f\r | |
122 | pop rdx ; get saved MSR_IA32_MISC_ENABLE[63-32]\r | |
123 | test edx, BIT2\r | |
124 | jz @f\r | |
125 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
126 | rdmsr\r | |
127 | or dx, BIT2 ; set XD Disable bit if it was set before entering into SMM\r | |
128 | wrmsr\r | |
129 | @@:\r | |
130 | \r | |
131 | rsm\r | |
132 | _OnStmSetup ENDP\r | |
133 | \r | |
134 | _OnStmTeardown PROC\r | |
135 | ;\r | |
136 | ; Check XD disable bit\r | |
137 | ;\r | |
138 | xor r8, r8\r | |
139 | mov rax, offset ASM_PFX(gStmXdSupported)\r | |
140 | mov al, [rax]\r | |
141 | cmp al, 0\r | |
142 | jz @StmXdDone2\r | |
143 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
144 | rdmsr\r | |
145 | mov r8, rdx ; save MSR_IA32_MISC_ENABLE[63-32]\r | |
146 | test edx, BIT2 ; MSR_IA32_MISC_ENABLE[34]\r | |
147 | jz @f\r | |
148 | and dx, 0FFFBh ; clear XD Disable bit if it is set\r | |
149 | wrmsr\r | |
150 | @@:\r | |
151 | mov ecx, MSR_EFER\r | |
152 | rdmsr\r | |
153 | or ax, MSR_EFER_XD ; enable NXE\r | |
154 | wrmsr\r | |
155 | @StmXdDone2:\r | |
156 | push r8\r | |
157 | \r | |
158 | add rsp, -20h\r | |
159 | call SmmStmTeardown\r | |
160 | add rsp, 20h\r | |
161 | \r | |
162 | mov rax, offset ASM_PFX(gStmXdSupported)\r | |
163 | mov al, [rax]\r | |
164 | cmp al, 0\r | |
165 | jz @f\r | |
166 | pop rdx ; get saved MSR_IA32_MISC_ENABLE[63-32]\r | |
167 | test edx, BIT2\r | |
168 | jz @f\r | |
169 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
170 | rdmsr\r | |
171 | or dx, BIT2 ; set XD Disable bit if it was set before entering into SMM\r | |
172 | wrmsr\r | |
173 | @@:\r | |
174 | \r | |
175 | rsm\r | |
176 | _OnStmTeardown ENDP\r | |
177 | \r | |
178 | END\r |