1;------------------------------------------------------------------------------
2;
3; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
4; SPDX-License-Identifier: BSD-2-Clause-Patent
5;
6; Module Name:
7;
8;   CpuId.Asm
9;
10; Abstract:
11;
12;   AsmCpuid function
13;
14; Notes:
15;
16;------------------------------------------------------------------------------
17
18    DEFAULT REL
19    SECTION .text
20
21;------------------------------------------------------------------------------
22;  VOID
23;  EFIAPI
24;  AsmCpuid (
25;    IN   UINT32  RegisterInEax,
26;    OUT  UINT32  *RegisterOutEax  OPTIONAL,
27;    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
28;    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
29;    OUT  UINT32  *RegisterOutEdx  OPTIONAL
30;    )
31;------------------------------------------------------------------------------
32global ASM_PFX(AsmCpuid)
33ASM_PFX(AsmCpuid):
34    push    rbx
35    mov     eax, ecx
36    push    rax                         ; save Index on stack
37    push    rdx
38    cpuid
39    test    r9, r9
40    jz      .0
41    mov     [r9], ecx
42.0:
43    pop     rcx
44    jrcxz   .1
45    mov     [rcx], eax
46.1:
47    mov     rcx, r8
48    jrcxz   .2
49    mov     [rcx], ebx
50.2:
51    mov     rcx, [rsp + 0x38]
52    jrcxz   .3
53    mov     [rcx], edx
54.3:
55    pop     rax                         ; restore Index to rax as return value
56    pop     rbx
57    ret
58
59