summaryrefslogtreecommitdiff
path: root/UnixPkg/Library/UnixBaseLib/X64/CpuId.asm
blob: c6182c161139614c5eaebb053b283b7473fc471a (plain)
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
60
61
62
;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution.  The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php.
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
; Module Name:
;
;   CpuId.Asm
;
; Abstract:
;
;   AsmCpuid function
;
; Notes:
;
;------------------------------------------------------------------------------

    .code

;------------------------------------------------------------------------------
;  VOID
;  EFIAPI
;  AsmCpuid (
;    IN   UINT32  RegisterInEax,
;    OUT  UINT32  *RegisterOutEax  OPTIONAL,
;    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
;    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
;    OUT  UINT32  *RegisterOutEdx  OPTIONAL
;    )
;------------------------------------------------------------------------------
AsmCpuid    PROC    USES    rbx
    mov     eax, ecx
    push    rax                         ; save Index on stack
    push    rdx
    cpuid
    test    r9, r9
    jz      @F
    mov     [r9], ecx
@@:
    pop     rcx
    jrcxz   @F
    mov     [rcx], eax
@@:
    mov     rcx, r8
    jrcxz   @F
    mov     [rcx], ebx
@@:
    mov     rcx, [rsp + 38h]
    jrcxz   @F
    mov     [rcx], edx
@@:
    pop     rax                         ; restore Index to rax as return value
    ret
AsmCpuid    ENDP

    END