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[mirror_edk2.git] / MdePkg / Library / BaseLib / Ipf / InternalFlushCacheRange.s

//++\r
// Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r
// This program and the accompanying materials                          \r
// are licensed and made available under the terms and conditions of the BSD License         \r
// which accompanies this distribution.  The full text of the license may be found at        \r
// http://opensource.org/licenses/bsd-license.php.                                            \r
//                                                                                           \r
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     \r
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             \r
// \r
//  Module Name:\r
//    InternalFlushCacheRange.s \r
//\r
//  Abstract:\r
//    Assemble routine to flush cache lines \r
//\r
// Revision History:\r
//\r
//--\r
.file  "IpfCpuCache.s"\r
\r
#include <IpfMacro.i>\r
\r
//\r
//  Internal worker function to invalidate a range of instruction cache lines\r
//  in the cache coherency domain of the calling CPU.\r
//\r
//  Internal worker function to invalidate the instruction cache lines specified\r
//  by Address and Length. If Address is not aligned on a cache line boundary,\r
//  then entire instruction cache line containing Address is invalidated. If\r
//  Address + Length is not aligned on a cache line boundary, then the entire\r
//  instruction cache line containing Address + Length -1 is invalidated. This\r
//  function may choose to invalidate the entire instruction cache if that is more\r
//  efficient than invalidating the specified range. If Length is 0, the no instruction\r
//  cache lines are invalidated. Address is returned.\r
//  This function is only available on IPF.\r
//\r
//  @param  Address The base address of the instruction cache lines to\r
//                  invalidate. If the CPU is in a physical addressing mode, then\r
//                  Address is a physical address. If the CPU is in a virtual\r
//                  addressing mode, then Address is a virtual address.\r
//\r
//  @param  Length  The number of bytes to invalidate from the instruction cache.\r
//\r
//  @return Address\r
//  \r
//  VOID *\r
//  EFIAPI\r
//  InternalFlushCacheRange (\r
//    IN      VOID                      *Address,\r
//    IN      UINTN                     Length\r
//    );\r
//\r
PROCEDURE_ENTRY (InternalFlushCacheRange)\r
\r
      NESTED_SETUP (5,8,0,0)\r
            \r
      mov         loc2 = ar.lc\r
      \r
      mov         loc3 = in0                  // Start address.\r
      mov         loc4 = in1;;                // Length in bytes.\r
      \r
      cmp.eq  p6,p7 = loc4, r0;;               // If Length is zero then don't flush any cache\r
      (p6)  br.spnt.many DoneFlushingC;;         \r
      \r
      add         loc4 = loc4,loc3 \r
      mov         loc5 = 1;;\r
      sub         loc4 = loc4, loc5 ;; // the End address to flush\r
                                         \r
      dep         loc3 = r0,loc3,0,5          \r
      dep         loc4 = r0,loc4,0,5;;         \r
      shr         loc3 = loc3,5             \r
      shr         loc4 = loc4,5;;    // 32 byte cache line\r
      \r
      sub         loc4 = loc4,loc3;; // total flush count, It should be add 1 but \r
                                     // the br.cloop will first execute one time \r
      mov         loc3 = in0                  \r
      mov         loc5 = 32      \r
      mov         ar.lc = loc4;;\r
\r
StillFlushingC:\r
      fc          loc3;; \r
      sync.i;;\r
      srlz.i;;\r
      add         loc3 = loc5,loc3;;\r
      br.cloop.sptk.few StillFlushingC;;\r
\r
DoneFlushingC:      \r
      mov         ar.lc = loc2     \r
      mov          r8   = in0       // return *Address\r
      NESTED_RETURN\r
\r
PROCEDURE_EXIT (InternalFlushCacheRange)\r
\r