Mercurial > hg > graal-compiler
comparison src/share/vm/runtime/icache.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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1 /* | |
2 * Copyright 1997-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_icache.cpp.incl" | |
27 | |
28 // The flush stub function address | |
29 AbstractICache::flush_icache_stub_t AbstractICache::_flush_icache_stub = NULL; | |
30 | |
31 void AbstractICache::initialize() { | |
32 // Making this stub must be FIRST use of assembler | |
33 ResourceMark rm; | |
34 | |
35 BufferBlob* b = BufferBlob::create("flush_icache_stub", ICache::stub_size); | |
36 CodeBuffer c(b->instructions_begin(), b->instructions_size()); | |
37 | |
38 ICacheStubGenerator g(&c); | |
39 g.generate_icache_flush(&_flush_icache_stub); | |
40 | |
41 // The first use of flush_icache_stub must apply it to itself. | |
42 // The StubCodeMark destructor in generate_icache_flush will | |
43 // call Assembler::flush, which in turn will call invalidate_range, | |
44 // which will in turn call the flush stub. Thus we don't need an | |
45 // explicit call to invalidate_range here. This assumption is | |
46 // checked in invalidate_range. | |
47 } | |
48 | |
49 void AbstractICache::call_flush_stub(address start, int lines) { | |
50 // The business with the magic number is just a little security. | |
51 // We cannot call the flush stub when generating the flush stub | |
52 // because it isn't there yet. So, the stub also returns its third | |
53 // parameter. This is a cheap check that the stub was really executed. | |
54 static int magic = 0xbaadbabe; | |
55 | |
56 int auto_magic = magic; // Make a local copy to avoid race condition | |
57 int r = (*_flush_icache_stub)(start, lines, auto_magic); | |
58 guarantee(r == auto_magic, "flush stub routine did not execute"); | |
59 ++magic; | |
60 } | |
61 | |
62 void AbstractICache::invalidate_word(address addr) { | |
63 // Because this is called for instruction patching on the fly, long after | |
64 // bootstrapping, we execute the stub directly. Account for a 4-byte word | |
65 // spanning two cache lines by computing a start line address by rounding | |
66 // addr down to a line_size boundary, and an end line address by adding | |
67 // the word size - 1 and rounding the result down to a line_size boundary. | |
68 // If we just added word size, we'd mistakenly flush the next cache line | |
69 // if the word to be flushed started in the last 4 bytes of the line. | |
70 // Doing that would segv if the next line weren't mapped. | |
71 | |
72 const int word_size_in_bytes = 4; // Always, regardless of platform | |
73 | |
74 intptr_t start_line = ((intptr_t)addr + 0) & ~(ICache::line_size - 1); | |
75 intptr_t end_line = ((intptr_t)addr + word_size_in_bytes - 1) | |
76 & ~(ICache::line_size - 1); | |
77 (*_flush_icache_stub)((address)start_line, start_line == end_line ? 1 : 2, 0); | |
78 } | |
79 | |
80 void AbstractICache::invalidate_range(address start, int nbytes) { | |
81 static bool firstTime = true; | |
82 if (firstTime) { | |
83 guarantee(start == CAST_FROM_FN_PTR(address, _flush_icache_stub), | |
84 "first flush should be for flush stub"); | |
85 firstTime = false; | |
86 return; | |
87 } | |
88 if (nbytes == 0) { | |
89 return; | |
90 } | |
91 // Align start address to an icache line boundary and transform | |
92 // nbytes to an icache line count. | |
93 const uint line_offset = mask_address_bits(start, ICache::line_size-1); | |
94 if (line_offset != 0) { | |
95 start -= line_offset; | |
96 nbytes += line_offset; | |
97 } | |
98 call_flush_stub(start, round_to(nbytes, ICache::line_size) >> | |
99 ICache::log2_line_size); | |
100 } | |
101 | |
102 // For init.cpp | |
103 void icache_init() { | |
104 ICache::initialize(); | |
105 } |