EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ipf/ReadCpuid.s

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