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1 | /** @file\r |
| 2 | AsmCpuidEx function.\r |
| 3 | \r |
| 4 | Copyright (c) 2006 - 2007, Intel Corporation<BR>\r |
| 5 | All rights reserved. This program and the accompanying materials\r |
| 6 | are licensed and made available under the terms and conditions of the BSD License\r |
| 7 | which accompanies this distribution. The full text of the license may be found at\r |
| 8 | http://opensource.org/licenses/bsd-license.php\r |
| 9 | \r |
| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
| 12 | \r |
| 13 | **/\r |
| 14 | \r |
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15 | \r |
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16 | \r |
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17 | \r |
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18 | /**\r |
| 19 | Retrieves CPUID information using an extended leaf identifier.\r |
| 20 | \r |
| 21 | Executes the CPUID instruction with EAX set to the value specified by Index\r |
| 22 | and ECX set to the value specified by SubIndex. This function always returns\r |
| 23 | Index. This function is only available on IA-32 and x64.\r |
| 24 | \r |
| 25 | If Eax is not NULL, then the value of EAX after CPUID is returned in Eax.\r |
| 26 | If Ebx is not NULL, then the value of EBX after CPUID is returned in Ebx.\r |
| 27 | If Ecx is not NULL, then the value of ECX after CPUID is returned in Ecx.\r |
| 28 | If Edx is not NULL, then the value of EDX after CPUID is returned in Edx.\r |
| 29 | \r |
| 30 | @param Index The 32-bit value to load into EAX prior to invoking the\r |
| 31 | CPUID instruction.\r |
| 32 | @param SubIndex The 32-bit value to load into ECX prior to invoking the\r |
| 33 | CPUID instruction.\r |
| 34 | @param Eax Pointer to the 32-bit EAX value returned by the CPUID\r |
| 35 | instruction. This is an optional parameter that may be\r |
| 36 | NULL.\r |
| 37 | @param Ebx Pointer to the 32-bit EBX value returned by the CPUID\r |
| 38 | instruction. This is an optional parameter that may be\r |
| 39 | NULL.\r |
| 40 | @param Ecx Pointer to the 32-bit ECX value returned by the CPUID\r |
| 41 | instruction. This is an optional parameter that may be\r |
| 42 | NULL.\r |
| 43 | @param Edx Pointer to the 32-bit EDX value returned by the CPUID\r |
| 44 | instruction. This is an optional parameter that may be\r |
| 45 | NULL.\r |
| 46 | \r |
| 47 | @return Index\r |
| 48 | \r |
| 49 | **/\r |
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50 | UINT32\r |
| 51 | EFIAPI\r |
| 52 | AsmCpuidEx (\r |
| 53 | IN UINT32 Index,\r |
| 54 | IN UINT32 SubIndex,\r |
| 55 | OUT UINT32 *RegisterEax, OPTIONAL\r |
| 56 | OUT UINT32 *RegisterEbx, OPTIONAL\r |
| 57 | OUT UINT32 *RegisterEcx, OPTIONAL\r |
| 58 | OUT UINT32 *RegisterEdx OPTIONAL\r |
| 59 | )\r |
| 60 | {\r |
| 61 | _asm {\r |
| 62 | mov eax, Index\r |
| 63 | mov ecx, SubIndex\r |
| 64 | cpuid\r |
| 65 | push ecx\r |
| 66 | mov ecx, RegisterEax\r |
| 67 | jecxz SkipEax\r |
| 68 | mov [ecx], eax\r |
| 69 | SkipEax:\r |
| 70 | mov ecx, RegisterEbx\r |
| 71 | jecxz SkipEbx\r |
| 72 | mov [ecx], ebx\r |
| 73 | SkipEbx:\r |
| 74 | pop eax\r |
| 75 | mov ecx, RegisterEcx\r |
| 76 | jecxz SkipEcx\r |
| 77 | mov [ecx], eax\r |
| 78 | SkipEcx:\r |
| 79 | mov ecx, RegisterEdx\r |
| 80 | jecxz SkipEdx\r |
| 81 | mov [ecx], edx\r |
| 82 | SkipEdx:\r |
| 83 | mov eax, Index\r |
| 84 | }\r |
| 85 | }\r |
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