Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/runtime/icache.cpp
src/share/vm/runtime/icache.cpp
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| 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 "memory/resourceArea.hpp" | |
| 27 #include "runtime/icache.hpp" | |
| 28 | |
| 29 // The flush stub function address | |
| 30 AbstractICache::flush_icache_stub_t AbstractICache::_flush_icache_stub = NULL; | |
| 31 | |
| 32 void AbstractICache::initialize() { | |
| 33 // Making this stub must be FIRST use of assembler | |
| 34 ResourceMark rm; | |
| 35 | |
| 36 BufferBlob* b = BufferBlob::create("flush_icache_stub", ICache::stub_size); | |
| 37 CodeBuffer c(b); | |
| 38 | |
| 39 ICacheStubGenerator g(&c); | |
| 40 g.generate_icache_flush(&_flush_icache_stub); | |
| 41 | |
| 42 // The first use of flush_icache_stub must apply it to itself. | |
| 43 // The StubCodeMark destructor in generate_icache_flush will | |
| 44 // call Assembler::flush, which in turn will call invalidate_range, | |
| 45 // which will in turn call the flush stub. Thus we don't need an | |
| 46 // explicit call to invalidate_range here. This assumption is | |
| 47 // checked in invalidate_range. | |
| 48 } | |
| 49 | |
| 50 void AbstractICache::call_flush_stub(address start, int lines) { | |
| 51 // The business with the magic number is just a little security. | |
| 52 // We cannot call the flush stub when generating the flush stub | |
| 53 // because it isn't there yet. So, the stub also returns its third | |
| 54 // parameter. This is a cheap check that the stub was really executed. | |
| 55 static int magic = 0xbaadbabe; | |
| 56 | |
| 57 int auto_magic = magic; // Make a local copy to avoid race condition | |
| 58 int r = (*_flush_icache_stub)(start, lines, auto_magic); | |
| 59 guarantee(r == auto_magic, "flush stub routine did not execute"); | |
| 60 ++magic; | |
| 61 } | |
| 62 | |
| 63 void AbstractICache::invalidate_word(address addr) { | |
| 64 // Because this is called for instruction patching on the fly, long after | |
| 65 // bootstrapping, we execute the stub directly. Account for a 4-byte word | |
| 66 // spanning two cache lines by computing a start line address by rounding | |
| 67 // addr down to a line_size boundary, and an end line address by adding | |
| 68 // the word size - 1 and rounding the result down to a line_size boundary. | |
| 69 // If we just added word size, we'd mistakenly flush the next cache line | |
| 70 // if the word to be flushed started in the last 4 bytes of the line. | |
| 71 // Doing that would segv if the next line weren't mapped. | |
| 72 | |
| 73 const int word_size_in_bytes = 4; // Always, regardless of platform | |
| 74 | |
| 75 intptr_t start_line = ((intptr_t)addr + 0) & ~(ICache::line_size - 1); | |
| 76 intptr_t end_line = ((intptr_t)addr + word_size_in_bytes - 1) | |
| 77 & ~(ICache::line_size - 1); | |
| 78 (*_flush_icache_stub)((address)start_line, start_line == end_line ? 1 : 2, 0); | |
| 79 } | |
| 80 | |
| 81 void AbstractICache::invalidate_range(address start, int nbytes) { | |
| 82 static bool firstTime = true; | |
| 83 if (firstTime) { | |
| 84 guarantee(start == CAST_FROM_FN_PTR(address, _flush_icache_stub), | |
| 85 "first flush should be for flush stub"); | |
| 86 firstTime = false; | |
| 87 return; | |
| 88 } | |
| 89 if (nbytes == 0) { | |
| 90 return; | |
| 91 } | |
| 92 // Align start address to an icache line boundary and transform | |
| 93 // nbytes to an icache line count. | |
| 94 const uint line_offset = mask_address_bits(start, ICache::line_size-1); | |
| 95 if (line_offset != 0) { | |
| 96 start -= line_offset; | |
| 97 nbytes += line_offset; | |
| 98 } | |
| 99 call_flush_stub(start, round_to(nbytes, ICache::line_size) >> | |
| 100 ICache::log2_line_size); | |
| 101 } | |
| 102 | |
| 103 // For init.cpp | |
| 104 void icache_init() { | |
| 105 ICache::initialize(); | |
| 106 } |
