/*

 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "runtime/icache.hpp"

#define __ _masm->

void ICacheStubGenerator::generate_icache_flush(ICache::flush_icache_stub_t* flush_icache_stub) {

  StubCodeMark mark(this, "ICache", "flush_icache_stub");

  address start = __ pc();

#ifdef AMD64

  const Register addr  = c_rarg0;

  const Register lines = c_rarg1;

  const Register magic = c_rarg2;

  Label flush_line, done;

  __ testl(lines, lines);

  __ jcc(Assembler::zero, done);

  // Force ordering wrt cflush.

  // Other fence and sync instructions won't do the job.

  __ mfence();

  __ bind(flush_line);

  __ clflush(Address(addr, 0));

  __ addptr(addr, ICache::line_size);

  __ decrementl(lines);

  __ jcc(Assembler::notZero, flush_line);

  __ mfence();

  __ bind(done);

#else

  const Address magic(rsp, 3*wordSize);

  __ lock(); __ addl(Address(rsp, 0), 0);

#endif // AMD64

  __ movptr(rax, magic); // Handshake with caller to make sure it happened!

  __ ret(0);

  // Must be set here so StubCodeMark destructor can call the flush stub.

  *flush_icache_stub = (ICache::flush_icache_stub_t)start;

}

#undef __