aboutsummaryrefslogtreecommitdiffstats
path: root/MdePkg/Library/BaseLib/Ia32/CpuId.nasm
blob: ee80f3a7d2df3858c061721b0437baa41220a68d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
;
;   CpuId.Asm
;
; Abstract:
;
;   AsmCpuid function
;
; Notes:
;
;------------------------------------------------------------------------------

    SECTION .text

;------------------------------------------------------------------------------
;  VOID
;  EFIAPI
;  AsmCpuid (
;    IN   UINT32  RegisterInEax,
;    OUT  UINT32  *RegisterOutEax  OPTIONAL,
;    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
;    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
;    OUT  UINT32  *RegisterOutEdx  OPTIONAL
;    );
;------------------------------------------------------------------------------
global ASM_PFX(AsmCpuid)
ASM_PFX(AsmCpuid):
    push    ebx
    push    ebp
    mov     ebp, esp
    mov     eax, [ebp + 12]
    cpuid
    push    ecx
    mov     ecx, [ebp + 16]
    jecxz   .0
    mov     [ecx], eax
.0:
    mov     ecx, [ebp + 20]
    jecxz   .1
    mov     [ecx], ebx
.1:
    mov     ecx, [ebp + 24]
    jecxz   .2
    pop     DWORD [ecx]
.2:
    mov     ecx, [ebp + 28]
    jecxz   .3
    mov     [ecx], edx
.3:
    mov     eax, [ebp + 12]
    leave
    pop     ebx
    ret