EdkModulePkg/Library/EdkDxeSalLib/Ipf/AsmIpfCpuCache.s

   1 //++
   2 // Copyright (c) 2006, Intel Corporation
   3 // All rights reserved. This program and the accompanying materials
   4 // are licensed and made available under the terms and conditions of the BSD License
   5 // which accompanies this distribution.  The full text of the license may be found at
   6 // http://opensource.org/licenses/bsd-license.php
   7 //
   8 // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   9 // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  10 //
  11 //  Module Name:
  12 //
  13 //    IpfCpuCache.s
  14 //
  15 //  Abstract:
  16 //
  17 //    Contains Misc assembly procedures to support IPF CPU AP.
  18 //
  19 // Revision History:
  20 //
  21 //--
  22
  23 .file  "IpfCpuCache.s"
  24
  25 #include  "IpfMacro.i"
  26 #include  "IpfDefines.h"
  27
  28 //-----------------------------------------------------------------------------
  29 //++
  30 // Flush Cache
  31 //
  32 // Arguments :
  33
  34 // Input = in0 = Starting Address to Flush.
  35 // Input = in1 = Length in bytes.
  36 // Input = b0 = return branch register.
  37 // On Entry :
  38 //
  39 // Return Value:
  40 //
  41 //  VOID
  42 //  SalFlushCache (
  43 //    IN UINT64   BaseToFlush,
  44 //    IN UINT64   LengthToFlush
  45 //    );
  46 //
  47 //--
  48 //---------------------------------------------------------------------------
  49 PROCEDURE_ENTRY (SalFlushCache)
  50
  51       NESTED_SETUP (5,8,0,0)
  52
  53       mov         loc2 = ar.lc
  54
  55       mov         loc3 = in0                  // Start address.
  56       mov         loc4 = in1;;                // Length in bytes.
  57
  58       cmp.eq  p6,p7 = loc4, r0;;               // If Length is zero then don't flush any cache
  59       (p6)  br.spnt.many DoneFlushingC;;
  60
  61       add         loc4 = loc4,loc3
  62       mov         loc5 = 1;;
  63       sub         loc4 = loc4, loc5 ;; // the End address to flush
  64
  65       dep         loc3 = r0,loc3,0,5
  66       dep         loc4 = r0,loc4,0,5;;
  67       shr         loc3 = loc3,5
  68       shr         loc4 = loc4,5;;    // 32 byte cache line
  69
  70       sub         loc4 = loc4,loc3;; // total flush count, It should be add 1 but
  71                                      // the br.cloop will first execute one time
  72       mov         loc3 = in0
  73       mov         loc5 = 32
  74       mov         ar.lc = loc4;;
  75
  76 StillFlushingC:
  77       fc          loc3;;
  78       sync.i;;
  79       srlz.i;;
  80       add         loc3 = loc5,loc3;;
  81       br.cloop.sptk.few StillFlushingC;;
  82
  83 DoneFlushingC:
  84       mov         ar.lc = loc2
  85       NESTED_RETURN
  86
  87 PROCEDURE_EXIT (SalFlushCache)
  88