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.S
15#
16# Abstract:
17#
18#   AsmCpuid function
19#
20# Notes:
21#
22#------------------------------------------------------------------------------
23
24#------------------------------------------------------------------------------
25#  VOID
26#  EFIAPI
27#  AsmCpuid (
28#    IN   UINT32  RegisterInEax,
29#    OUT  UINT32  *RegisterOutEax  OPTIONAL,
30#    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
31#    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
32#    OUT  UINT32  *RegisterOutEdx  OPTIONAL
33#    )
34#------------------------------------------------------------------------------
35ASM_GLOBAL ASM_PFX(AsmCpuid)
36ASM_PFX(AsmCpuid):
37    push    %rbx
38    mov     %ecx, %eax
39    push    %rax                         # save Index on stack
40    push    %rdx
41    cpuid
42    test    %r9, %r9
43    jz      L1
44    mov     %ecx, (%r9)
45L1:
46    pop     %rcx
47    jrcxz   L2
48    mov     %eax, (%rcx)
49L2:
50    mov     %r8, %rcx
51    jrcxz   L3
52    mov     %ebx, (%rcx)
53L3:
54    mov     0x38(%rsp), %rcx
55    jrcxz   L4
56    mov     %edx, (%rcx)
57L4:
58    pop     %rax                         # restore Index to rax as return value
59    pop     %rbx
60    ret
61