1 /*

     2  * Copyright (c) 1997, 2010, 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 "precompiled.hpp"

    26 #include "asm/macroAssembler.hpp"

    27 #include "runtime/icache.hpp"

    28 

    29 #define __ _masm->

    30 

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

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

    33 

    34   address start = __ pc();

    35 #ifdef AMD64

    36 

    37   const Register addr  = c_rarg0;

    38   const Register lines = c_rarg1;

    39   const Register magic = c_rarg2;

    40 

    41   Label flush_line, done;

    42 

    43   __ testl(lines, lines);

    44   __ jcc(Assembler::zero, done);

    45 

    46   // Force ordering wrt cflush.

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

    48   __ mfence();

    49 

    50   __ bind(flush_line);

    51   __ clflush(Address(addr, 0));

    52   __ addptr(addr, ICache::line_size);

    53   __ decrementl(lines);

    54   __ jcc(Assembler::notZero, flush_line);

    55 

    56   __ mfence();

    57 

    58   __ bind(done);

    59 

    60 #else

    61   const Address magic(rsp, 3*wordSize);

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

    63 #endif // AMD64

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

    65   __ ret(0);

    66 

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

    68   *flush_icache_stub = (ICache::flush_icache_stub_t)start;

    69 }

    70 

    71 #undef __