MdePkg/Library/BaseLib/Ipf/ReadCpuid.s

   1 /// @file
   2 ///  IPF specific AsmReadCpuid()function
   3 ///
   4 /// Copyright (c) 2006, Intel Corporation
   5 /// All rights reserved. This program and the accompanying materials
   6 /// are licensed and made available under the terms and conditions of the BSD License
   7 /// which accompanies this distribution.  The full text of the license may be found at
   8 /// http://opensource.org/licenses/bsd-license.php
   9 ///
  10 /// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 /// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 ///
  13 /// Module Name: ReadCpuid.s
  14 ///
  15 ///
  16
  17 //---------------------------------------------------------------------------------
  18 //++
  19 // AsmReadCpuid
  20 //
  21 // This routine is used to Reads the current value of Processor Identifier Register (CPUID).
  22 //
  23 // Arguments :
  24 //
  25 // On Entry : The 8-bit Processor Identifier Register index to read.
  26 //
  27 // Return Value: The current value of Processor Identifier Register specified by Index.
  28 //
  29 //--
  30 //----------------------------------------------------------------------------------
  31 .text
  32 .type   AsmReadCpuid, @function
  33 .proc   AsmReadCpuid
  34 .regstk 1, 0, 0, 0
  35
  36 AsmReadCpuid::
  37         mov             r8 = cpuid[in0];;
  38         br.ret.dpnt     b0;;
  39 .endp    AsmReadCpuid
  40