projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |