1 ;------------------------------------------------------------------------------ 2 ; 3 ; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 4 ; This program and the accompanying materials 5 ; are licensed and made available under the terms and conditions of the BSD License 6 ; which accompanies this distribution. The full text of the license may be found at 7 ; http://opensource.org/licenses/bsd-license.php. 8 ; 9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 ; 12 ; Module Name: 13 ; 14 ; CpuId.Asm 15 ; 16 ; Abstract: 17 ; 18 ; AsmCpuid function 19 ; 20 ; Notes: 21 ; 22 ;------------------------------------------------------------------------------ 23 24 DEFAULT REL 25 SECTION .text 26 27 ;------------------------------------------------------------------------------ 28 ; VOID 29 ; EFIAPI 30 ; AsmCpuid ( 31 ; IN UINT32 RegisterInEax, 32 ; OUT UINT32 *RegisterOutEax OPTIONAL, 33 ; OUT UINT32 *RegisterOutEbx OPTIONAL, 34 ; OUT UINT32 *RegisterOutEcx OPTIONAL, 35 ; OUT UINT32 *RegisterOutEdx OPTIONAL 36 ; ) 37 ;------------------------------------------------------------------------------ 38 global ASM_PFX(AsmCpuid) 39 ASM_PFX(AsmCpuid): 40 push rbx 41 mov eax, ecx 42 push rax ; save Index on stack 43 push rdx 44 cpuid 45 test r9, r9 46 jz .0 47 mov [r9], ecx 48 .0: 49 pop rcx 50 jrcxz .1 51 mov [rcx], eax 52 .1: 53 mov rcx, r8 54 jrcxz .2 55 mov [rcx], ebx 56 .2: 57 mov rcx, [rsp + 0x38] 58 jrcxz .3 59 mov [rcx], edx 60 .3: 61 pop rax ; restore Index to rax as return value 62 pop rbx 63 ret 64 65
