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1 /*
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2 * Copyright 1997-2004 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 // Interface for updating the instruction cache. Whenever the VM modifies
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26 // code, part of the processor instruction cache potentially has to be flushed.
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27
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28 // Default implementation is in icache.cpp, and can be hidden per-platform.
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29 // Most platforms must provide only ICacheStubGenerator::generate_icache_flush().
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30 // Platforms that don't require icache flushing can just nullify the public
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31 // members of AbstractICache in their ICache class. AbstractICache should never
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32 // be referenced other than by deriving the ICache class from it.
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33 //
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34 // The code for the ICache class and for generate_icache_flush() must be in
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35 // architecture-specific files, i.e., icache_<arch>.hpp/.cpp
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36
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37 class AbstractICache : AllStatic {
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38 public:
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39 // The flush stub signature
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40 typedef int (*flush_icache_stub_t)(address addr, int lines, int magic);
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41
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42 protected:
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43 // The flush stub function address
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44 static flush_icache_stub_t _flush_icache_stub;
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45
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46 // Call the flush stub
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47 static void call_flush_stub(address start, int lines);
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48
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49 public:
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50 enum {
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51 stub_size = 0, // Size of the icache flush stub in bytes
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52 line_size = 0, // Icache line size in bytes
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53 log2_line_size = 0 // log2(line_size)
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54 };
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55
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56 static void initialize();
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57 static void invalidate_word(address addr);
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58 static void invalidate_range(address start, int nbytes);
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59 };
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60
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61
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62 // Must be included before the definition of ICacheStubGenerator
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63 // because ICacheStubGenerator uses ICache definitions.
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64
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65 #include "incls/_icache_pd.hpp.incl"
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66
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67
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68 class ICacheStubGenerator : public StubCodeGenerator {
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69 public:
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70 ICacheStubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {}
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71
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72 // Generate the icache flush stub.
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73 //
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74 // Since we cannot flush the cache when this stub is generated,
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75 // it must be generated first, and just to be sure, we do extra
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76 // work to allow a check that these instructions got executed.
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77 //
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78 // The flush stub has three parameters (see flush_icache_stub_t).
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79 //
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80 // addr - Start address, must be aligned at log2_line_size
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81 // lines - Number of line_size icache lines to flush
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82 // magic - Magic number copied to result register to make sure
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83 // the stub executed properly
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84 //
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85 // A template for generate_icache_flush is
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86 //
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87 // #define __ _masm->
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88 //
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89 // void ICacheStubGenerator::generate_icache_flush(
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90 // ICache::flush_icache_stub_t* flush_icache_stub
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91 // ) {
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92 // StubCodeMark mark(this, "ICache", "flush_icache_stub");
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93 //
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94 // address start = __ pc();
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95 //
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96 // // emit flush stub asm code
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97 //
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98 // // Must be set here so StubCodeMark destructor can call the flush stub.
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99 // *flush_icache_stub = (ICache::flush_icache_stub_t)start;
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100 // };
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101 //
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102 // #undef __
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103 //
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104 // The first use of flush_icache_stub must apply it to itself. The
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105 // StubCodeMark destructor in generate_icache_flush will call Assembler::flush,
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106 // which in turn will call invalidate_range (see asm/assembler.cpp), which
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107 // in turn will call the flush stub *before* generate_icache_flush returns.
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108 // The usual method of having generate_icache_flush return the address of the
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109 // stub to its caller, which would then, e.g., store that address in
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110 // flush_icache_stub, won't work. generate_icache_flush must itself set
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111 // flush_icache_stub to the address of the stub it generates before
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112 // the StubCodeMark destructor is invoked.
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113
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114 void generate_icache_flush(ICache::flush_icache_stub_t* flush_icache_stub);
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115 };
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