Mercurial > hg > truffle
view src/cpu/x86/vm/icache_x86.hpp @ 1865:1c352af0135d
6763959: java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever
Summary: Absolute time 0 needs to return immediately.
Reviewed-by: phh, dcubed, dholmes
author | acorn |
---|---|
date | Mon, 04 Oct 2010 13:11:10 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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/* * Copyright (c) 1997, 2004, 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. * */ // Interface for updating the instruction cache. Whenever the VM modifies // code, part of the processor instruction cache potentially has to be flushed. // On the x86, this is a no-op -- the I-cache is guaranteed to be consistent // after the next jump, and the VM never modifies instructions directly ahead // of the instruction fetch path. // [phh] It's not clear that the above comment is correct, because on an MP // system where the dcaches are not snooped, only the thread doing the invalidate // will see the update. Even in the snooped case, a memory fence would be // necessary if stores weren't ordered. Fortunately, they are on all known // x86 implementations. class ICache : public AbstractICache { public: #ifdef AMD64 enum { stub_size = 64, // Size of the icache flush stub in bytes line_size = 32, // Icache line size in bytes log2_line_size = 5 // log2(line_size) }; // Use default implementation #else enum { stub_size = 16, // Size of the icache flush stub in bytes line_size = BytesPerWord, // conservative log2_line_size = LogBytesPerWord // log2(line_size) }; #endif // AMD64 };