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1 /*
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2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_icache.cpp.incl"
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27
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28 // The flush stub function address
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29 AbstractICache::flush_icache_stub_t AbstractICache::_flush_icache_stub = NULL;
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30
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31 void AbstractICache::initialize() {
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32 // Making this stub must be FIRST use of assembler
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33 ResourceMark rm;
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34
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35 BufferBlob* b = BufferBlob::create("flush_icache_stub", ICache::stub_size);
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36 CodeBuffer c(b->instructions_begin(), b->instructions_size());
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37
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38 ICacheStubGenerator g(&c);
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39 g.generate_icache_flush(&_flush_icache_stub);
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40
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41 // The first use of flush_icache_stub must apply it to itself.
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42 // The StubCodeMark destructor in generate_icache_flush will
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43 // call Assembler::flush, which in turn will call invalidate_range,
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44 // which will in turn call the flush stub. Thus we don't need an
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45 // explicit call to invalidate_range here. This assumption is
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46 // checked in invalidate_range.
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47 }
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48
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49 void AbstractICache::call_flush_stub(address start, int lines) {
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50 // The business with the magic number is just a little security.
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51 // We cannot call the flush stub when generating the flush stub
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52 // because it isn't there yet. So, the stub also returns its third
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53 // parameter. This is a cheap check that the stub was really executed.
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54 static int magic = 0xbaadbabe;
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55
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56 int auto_magic = magic; // Make a local copy to avoid race condition
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57 int r = (*_flush_icache_stub)(start, lines, auto_magic);
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58 guarantee(r == auto_magic, "flush stub routine did not execute");
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59 ++magic;
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60 }
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61
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62 void AbstractICache::invalidate_word(address addr) {
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63 // Because this is called for instruction patching on the fly, long after
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64 // bootstrapping, we execute the stub directly. Account for a 4-byte word
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65 // spanning two cache lines by computing a start line address by rounding
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66 // addr down to a line_size boundary, and an end line address by adding
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67 // the word size - 1 and rounding the result down to a line_size boundary.
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68 // If we just added word size, we'd mistakenly flush the next cache line
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69 // if the word to be flushed started in the last 4 bytes of the line.
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70 // Doing that would segv if the next line weren't mapped.
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71
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72 const int word_size_in_bytes = 4; // Always, regardless of platform
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73
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74 intptr_t start_line = ((intptr_t)addr + 0) & ~(ICache::line_size - 1);
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75 intptr_t end_line = ((intptr_t)addr + word_size_in_bytes - 1)
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76 & ~(ICache::line_size - 1);
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77 (*_flush_icache_stub)((address)start_line, start_line == end_line ? 1 : 2, 0);
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78 }
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79
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80 void AbstractICache::invalidate_range(address start, int nbytes) {
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81 static bool firstTime = true;
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82 if (firstTime) {
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83 guarantee(start == CAST_FROM_FN_PTR(address, _flush_icache_stub),
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84 "first flush should be for flush stub");
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85 firstTime = false;
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86 return;
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87 }
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88 if (nbytes == 0) {
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89 return;
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90 }
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91 // Align start address to an icache line boundary and transform
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92 // nbytes to an icache line count.
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93 const uint line_offset = mask_address_bits(start, ICache::line_size-1);
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94 if (line_offset != 0) {
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95 start -= line_offset;
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96 nbytes += line_offset;
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97 }
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98 call_flush_stub(start, round_to(nbytes, ICache::line_size) >>
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99 ICache::log2_line_size);
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100 }
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101
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102 // For init.cpp
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103 void icache_init() {
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104 ICache::initialize();
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105 }
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