1 /*
   2  * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "incls/_precompiled.incl"
  26 #include "incls/_icache_x86.cpp.incl"
  27 
  28 #define __ _masm->
  29 
  30 void ICacheStubGenerator::generate_icache_flush(ICache::flush_icache_stub_t* flush_icache_stub) {
  31   StubCodeMark mark(this, "ICache", "flush_icache_stub");
  32 
  33   address start = __ pc();
  34 #ifdef AMD64
  35 
  36   const Register addr  = c_rarg0;
  37   const Register lines = c_rarg1;
  38   const Register magic = c_rarg2;
  39 
  40   Label flush_line, done;
  41 
  42   __ testl(lines, lines);
  43   __ jcc(Assembler::zero, done);
  44 
  45   // Force ordering wrt cflush.
  46   // Other fence and sync instructions won't do the job.
  47   __ mfence();
  48 
  49   __ bind(flush_line);
  50   __ clflush(Address(addr, 0));
  51   __ addptr(addr, ICache::line_size);
  52   __ decrementl(lines);
  53   __ jcc(Assembler::notZero, flush_line);
  54 
  55   __ mfence();
  56 
  57   __ bind(done);
  58 
  59 #else
  60   const Address magic(rsp, 3*wordSize);
  61   __ lock(); __ addl(Address(rsp, 0), 0);
  62 #endif // AMD64
  63   __ movptr(rax, magic); // Handshake with caller to make sure it happened!
  64   __ ret(0);
  65 
  66   // Must be set here so StubCodeMark destructor can call the flush stub.
  67   *flush_icache_stub = (ICache::flush_icache_stub_t)start;
  68 }
  69 
  70 #undef __