MdePkg: Apply uncrustify changes

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / CpuId.c

/** @file\r
  AsmCpuid function.\r
\r
  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
/**\r
  Retrieves CPUID information.\r
\r
  Executes the CPUID instruction with EAX set to the value specified by Index.\r
  This function always returns Index.\r
  If Eax is not NULL, then the value of EAX after CPUID is returned in Eax.\r
  If Ebx is not NULL, then the value of EBX after CPUID is returned in Ebx.\r
  If Ecx is not NULL, then the value of ECX after CPUID is returned in Ecx.\r
  If Edx is not NULL, then the value of EDX after CPUID is returned in Edx.\r
  This function is only available on IA-32 and x64.\r
\r
  @param  Index         The 32-bit value to load into EAX prior to invoking the CPUID\r
                        instruction.\r
  @param  RegisterEax   A pointer to the 32-bit EAX value returned by the CPUID\r
                        instruction. This is an optional parameter that may be NULL.\r
  @param  RegisterEbx   A pointer to the 32-bit EBX value returned by the CPUID\r
                        instruction. This is an optional parameter that may be NULL.\r
  @param  RegisterEcx   A pointer to the 32-bit ECX value returned by the CPUID\r
                        instruction. This is an optional parameter that may be NULL.\r
  @param  RegisterEdx   A pointer to the 32-bit EDX value returned by the CPUID\r
                        instruction. This is an optional parameter that may be NULL.\r
\r
  @return Index.\r
\r
**/\r
UINT32\r
EFIAPI\r
AsmCpuid (\r
  IN      UINT32  Index,\r
  OUT     UINT32  *RegisterEax   OPTIONAL,\r
  OUT     UINT32  *RegisterEbx   OPTIONAL,\r
  OUT     UINT32  *RegisterEcx   OPTIONAL,\r
  OUT     UINT32  *RegisterEdx   OPTIONAL\r
  )\r
{\r
  _asm {\r
    mov     eax, Index\r
    cpuid\r
    push    ecx\r
    mov     ecx, RegisterEax\r
    jecxz   SkipEax\r
    mov     [ecx], eax\r
SkipEax:\r
    mov     ecx, RegisterEbx\r
    jecxz   SkipEbx\r
    mov     [ecx], ebx\r
SkipEbx:\r
    pop     eax\r
    mov     ecx, RegisterEcx\r
    jecxz   SkipEcx\r
    mov     [ecx], eax\r
SkipEcx:\r
    mov     ecx, RegisterEdx\r
    jecxz   SkipEdx\r
    mov     [ecx], edx\r
SkipEdx:\r
    mov     eax, Index\r
  }\r
}\r