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b6d11d7c LD |
1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
3 | ; Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>\r | |
4 | ; Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r | |
5 | ;\r | |
6 | ; This program and the accompanying materials are licensed and made available\r | |
7 | ; under the terms and conditions of the BSD License which accompanies this\r | |
8 | ; distribution. The full text of the license may be found at\r | |
9 | ; http://opensource.org/licenses/bsd-license.php.\r | |
10 | ;\r | |
11 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | ;\r | |
14 | ;------------------------------------------------------------------------------\r | |
15 | \r | |
16 | DEFAULT REL\r | |
17 | SECTION .text\r | |
18 | \r | |
19 | ;------------------------------------------------------------------------------\r | |
20 | ; Check whether we need to unroll the String I/O in SEV guest\r | |
21 | ;\r | |
22 | ; Return // eax (1 - unroll, 0 - no unroll)\r | |
23 | ;------------------------------------------------------------------------------\r | |
24 | global ASM_PFX(SevNoRepIo)\r | |
25 | ASM_PFX(SevNoRepIo):\r | |
26 | \r | |
27 | ; CPUID clobbers ebx, ecx and edx\r | |
28 | push rbx\r | |
29 | push rcx\r | |
30 | push rdx\r | |
31 | \r | |
32 | ; Check if we are runing under hypervisor\r | |
33 | ; CPUID(1).ECX Bit 31\r | |
34 | mov eax, 1\r | |
35 | cpuid\r | |
36 | bt ecx, 31\r | |
37 | jnc @UseRepIo\r | |
38 | \r | |
39 | ; Check if we have Memory encryption CPUID leaf\r | |
40 | mov eax, 0x80000000\r | |
41 | cpuid\r | |
42 | cmp eax, 0x8000001f\r | |
43 | jl @UseRepIo\r | |
44 | \r | |
45 | ; Check for memory encryption feature:\r | |
46 | ; CPUID Fn8000_001F[EAX] - Bit 1\r | |
47 | ;\r | |
48 | mov eax, 0x8000001f\r | |
49 | cpuid\r | |
50 | bt eax, 1\r | |
51 | jnc @UseRepIo\r | |
52 | \r | |
53 | ; Check if memory encryption is enabled\r | |
54 | ; MSR_0xC0010131 - Bit 0 (SEV enabled)\r | |
55 | ; MSR_0xC0010131 - Bit 1 (SEV-ES enabled)\r | |
56 | mov ecx, 0xc0010131\r | |
57 | rdmsr\r | |
58 | \r | |
59 | ; Check for (SevEsEnabled == 0 && SevEnabled == 1)\r | |
60 | and eax, 3\r | |
61 | cmp eax, 1\r | |
62 | je @SevNoRepIo_Done\r | |
63 | \r | |
64 | @UseRepIo:\r | |
65 | xor eax, eax\r | |
66 | \r | |
67 | @SevNoRepIo_Done:\r | |
68 | pop rdx\r | |
69 | pop rcx\r | |
70 | pop rbx\r | |
71 | ret\r | |
72 | \r | |
73 | ;------------------------------------------------------------------------------\r | |
74 | ; VOID\r | |
75 | ; EFIAPI\r | |
76 | ; IoReadFifo8 (\r | |
77 | ; IN UINTN Port, // rcx\r | |
78 | ; IN UINTN Size, // rdx\r | |
79 | ; OUT VOID *Buffer // r8\r | |
80 | ; );\r | |
81 | ;------------------------------------------------------------------------------\r | |
82 | global ASM_PFX(IoReadFifo8)\r | |
83 | ASM_PFX(IoReadFifo8):\r | |
84 | xchg rcx, rdx\r | |
85 | xchg rdi, r8 ; rdi: buffer address; r8: save rdi\r | |
86 | \r | |
87 | ; Check if we need to unroll String I/O\r | |
88 | call ASM_PFX(SevNoRepIo)\r | |
89 | test eax, eax\r | |
90 | jnz @IoReadFifo8_NoRep\r | |
91 | \r | |
92 | cld\r | |
93 | rep insb\r | |
94 | jmp @IoReadFifo8_Done\r | |
95 | \r | |
96 | @IoReadFifo8_NoRep:\r | |
97 | jrcxz @IoReadFifo8_Done\r | |
98 | \r | |
99 | @IoReadFifo8_Loop:\r | |
100 | in al, dx\r | |
101 | mov byte [rdi], al\r | |
102 | inc rdi\r | |
103 | loop @IoReadFifo8_Loop\r | |
104 | \r | |
105 | @IoReadFifo8_Done:\r | |
106 | mov rdi, r8 ; restore rdi\r | |
107 | ret\r | |
108 | \r | |
109 | ;------------------------------------------------------------------------------\r | |
110 | ; VOID\r | |
111 | ; EFIAPI\r | |
112 | ; IoReadFifo16 (\r | |
113 | ; IN UINTN Port, // rcx\r | |
114 | ; IN UINTN Size, // rdx\r | |
115 | ; OUT VOID *Buffer // r8\r | |
116 | ; );\r | |
117 | ;------------------------------------------------------------------------------\r | |
118 | global ASM_PFX(IoReadFifo16)\r | |
119 | ASM_PFX(IoReadFifo16):\r | |
120 | xchg rcx, rdx\r | |
121 | xchg rdi, r8 ; rdi: buffer address; r8: save rdi\r | |
122 | \r | |
123 | ; Check if we need to unroll String I/O\r | |
124 | call ASM_PFX(SevNoRepIo)\r | |
125 | test eax, eax\r | |
126 | jnz @IoReadFifo16_NoRep\r | |
127 | \r | |
128 | cld\r | |
129 | rep insw\r | |
130 | jmp @IoReadFifo16_Done\r | |
131 | \r | |
132 | @IoReadFifo16_NoRep:\r | |
133 | jrcxz @IoReadFifo16_Done\r | |
134 | \r | |
135 | @IoReadFifo16_Loop:\r | |
136 | in ax, dx\r | |
137 | mov word [rdi], ax\r | |
138 | add rdi, 2\r | |
139 | loop @IoReadFifo16_Loop\r | |
140 | \r | |
141 | @IoReadFifo16_Done:\r | |
142 | mov rdi, r8 ; restore rdi\r | |
143 | ret\r | |
144 | \r | |
145 | ;------------------------------------------------------------------------------\r | |
146 | ; VOID\r | |
147 | ; EFIAPI\r | |
148 | ; IoReadFifo32 (\r | |
149 | ; IN UINTN Port, // rcx\r | |
150 | ; IN UINTN Size, // rdx\r | |
151 | ; OUT VOID *Buffer // r8\r | |
152 | ; );\r | |
153 | ;------------------------------------------------------------------------------\r | |
154 | global ASM_PFX(IoReadFifo32)\r | |
155 | ASM_PFX(IoReadFifo32):\r | |
156 | xchg rcx, rdx\r | |
157 | xchg rdi, r8 ; rdi: buffer address; r8: save rdi\r | |
158 | \r | |
159 | ; Check if we need to unroll String I/O\r | |
160 | call ASM_PFX(SevNoRepIo)\r | |
161 | test eax, eax\r | |
162 | jnz @IoReadFifo32_NoRep\r | |
163 | \r | |
164 | cld\r | |
165 | rep insd\r | |
166 | jmp @IoReadFifo32_Done\r | |
167 | \r | |
168 | @IoReadFifo32_NoRep:\r | |
169 | jrcxz @IoReadFifo32_Done\r | |
170 | \r | |
171 | @IoReadFifo32_Loop:\r | |
172 | in eax, dx\r | |
173 | mov dword [rdi], eax\r | |
174 | add rdi, 4\r | |
175 | loop @IoReadFifo32_Loop\r | |
176 | \r | |
177 | @IoReadFifo32_Done:\r | |
178 | mov rdi, r8 ; restore rdi\r | |
179 | ret\r | |
180 | \r | |
181 | ;------------------------------------------------------------------------------\r | |
182 | ; VOID\r | |
183 | ; EFIAPI\r | |
184 | ; IoWriteFifo8 (\r | |
185 | ; IN UINTN Port, // rcx\r | |
186 | ; IN UINTN Size, // rdx\r | |
187 | ; IN VOID *Buffer // r8\r | |
188 | ; );\r | |
189 | ;------------------------------------------------------------------------------\r | |
190 | global ASM_PFX(IoWriteFifo8)\r | |
191 | ASM_PFX(IoWriteFifo8):\r | |
192 | xchg rcx, rdx\r | |
193 | xchg rsi, r8 ; rsi: buffer address; r8: save rsi\r | |
194 | \r | |
195 | ; Check if we need to unroll String I/O\r | |
196 | call ASM_PFX(SevNoRepIo)\r | |
197 | test eax, eax\r | |
198 | jnz @IoWriteFifo8_NoRep\r | |
199 | \r | |
200 | cld\r | |
201 | rep outsb\r | |
202 | jmp @IoWriteFifo8_Done\r | |
203 | \r | |
204 | @IoWriteFifo8_NoRep:\r | |
205 | jrcxz @IoWriteFifo8_Done\r | |
206 | \r | |
207 | @IoWriteFifo8_Loop:\r | |
208 | mov byte [rsi], al\r | |
209 | out dx, al\r | |
210 | inc rsi\r | |
211 | loop @IoWriteFifo8_Loop\r | |
212 | \r | |
213 | @IoWriteFifo8_Done:\r | |
214 | mov rsi, r8 ; restore rsi\r | |
215 | ret\r | |
216 | \r | |
217 | ;------------------------------------------------------------------------------\r | |
218 | ; VOID\r | |
219 | ; EFIAPI\r | |
220 | ; IoWriteFifo16 (\r | |
221 | ; IN UINTN Port, // rcx\r | |
222 | ; IN UINTN Size, // rdx\r | |
223 | ; IN VOID *Buffer // r8\r | |
224 | ; );\r | |
225 | ;------------------------------------------------------------------------------\r | |
226 | global ASM_PFX(IoWriteFifo16)\r | |
227 | ASM_PFX(IoWriteFifo16):\r | |
228 | xchg rcx, rdx\r | |
229 | xchg rsi, r8 ; rsi: buffer address; r8: save rsi\r | |
230 | \r | |
231 | ; Check if we need to unroll String I/O\r | |
232 | call ASM_PFX(SevNoRepIo)\r | |
233 | test eax, eax\r | |
234 | jnz @IoWriteFifo16_NoRep\r | |
235 | \r | |
236 | cld\r | |
237 | rep outsw\r | |
238 | jmp @IoWriteFifo16_Done\r | |
239 | \r | |
240 | @IoWriteFifo16_NoRep:\r | |
241 | jrcxz @IoWriteFifo16_Done\r | |
242 | \r | |
243 | @IoWriteFifo16_Loop:\r | |
244 | mov word [rsi], ax\r | |
245 | out dx, ax\r | |
246 | add rsi, 2\r | |
247 | loop @IoWriteFifo16_Loop\r | |
248 | \r | |
249 | @IoWriteFifo16_Done:\r | |
250 | mov rsi, r8 ; restore rsi\r | |
251 | ret\r | |
252 | \r | |
253 | ;------------------------------------------------------------------------------\r | |
254 | ; VOID\r | |
255 | ; EFIAPI\r | |
256 | ; IoWriteFifo32 (\r | |
257 | ; IN UINTN Port, // rcx\r | |
258 | ; IN UINTN Size, // rdx\r | |
259 | ; IN VOID *Buffer // r8\r | |
260 | ; );\r | |
261 | ;------------------------------------------------------------------------------\r | |
262 | global ASM_PFX(IoWriteFifo32)\r | |
263 | ASM_PFX(IoWriteFifo32):\r | |
264 | xchg rcx, rdx\r | |
265 | xchg rsi, r8 ; rsi: buffer address; r8: save rsi\r | |
266 | \r | |
267 | ; Check if we need to unroll String I/O\r | |
268 | call ASM_PFX(SevNoRepIo)\r | |
269 | test eax, eax\r | |
270 | jnz @IoWriteFifo32_NoRep\r | |
271 | \r | |
272 | cld\r | |
273 | rep outsd\r | |
274 | jmp @IoWriteFifo32_Done\r | |
275 | \r | |
276 | @IoWriteFifo32_NoRep:\r | |
277 | jrcxz @IoWriteFifo32_Done\r | |
278 | \r | |
279 | @IoWriteFifo32_Loop:\r | |
280 | mov dword [rsi], eax\r | |
281 | out dx, eax\r | |
282 | add rsi, 4\r | |
283 | loop @IoWriteFifo32_Loop\r | |
284 | \r | |
285 | @IoWriteFifo32_Done:\r | |
286 | mov rsi, r8 ; restore rsi\r | |
287 | ret\r | |
288 | \r |