[297] | 1 | /* -*- c++ -*- |
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| 2 | * |
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| 3 | * SOCLIB_LGPL_HEADER_BEGIN |
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| 4 | * |
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| 5 | * This file is part of SoCLib, GNU LGPLv2.1. |
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| 6 | * |
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| 7 | * SoCLib is free software; you can redistribute it and/or modify it |
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| 8 | * under the terms of the GNU Lesser General Public License as published |
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| 9 | * by the Free Software Foundation; version 2.1 of the License. |
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| 10 | * |
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| 11 | * SoCLib is distributed in the hope that it will be useful, but |
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| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with SoCLib; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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| 19 | * 02110-1301 USA |
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| 20 | * |
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| 21 | * SOCLIB_LGPL_HEADER_END |
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| 22 | * |
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| 23 | * Copyright (c) UPMC, Lip6 |
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| 24 | * Alain Greiner <alain.greiner@lip6.fr> July 2008 |
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| 25 | * |
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| 26 | * Maintainers: alain |
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| 27 | */ |
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| 28 | |
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| 29 | //////////////////////////////////////////////////////////////////////////////// |
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| 30 | // File : generic_cache.h |
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| 31 | // Date : 07/01/2012 |
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| 32 | // Authors : Alain Greiner |
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| 33 | ///////////////////////////////////////////////////////////////////////////////// |
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| 34 | // This object is a generic, set associative, cache. |
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| 35 | // Each slot can be in three states: VALID, EMPTY or ZOMBI. |
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[393] | 36 | // The ZOMBI state is used by cache coherence protocols to indicate |
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[297] | 37 | // a pending cleanup request. |
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| 38 | // Hit if ( (matching tag) and (state == VALID). |
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| 39 | // The replacement policy is pseudo-LRU. The victim selection process cannot |
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| 40 | // fail if the ZOMBI state is not used. |
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| 41 | // But it can fail if all ways are in ZOMBI state. |
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| 42 | ///////////////////////////////////////////////////////////////////////////////// |
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| 43 | // Implementation note |
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| 44 | // The DATA part is implemented as an uint32_t array[nways*nsets*nwords]. |
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| 45 | // The DIRECTORY part is implemented as an uint32_t array[nways*nsets]. |
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| 46 | // All methods requiring a dual port RAM or cache modification using |
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| 47 | // an associative search have been deprecated. |
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| 48 | ///////////////////////////////////////////////////////////////////////////////// |
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| 49 | // Constructor parameters are : |
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| 50 | // - std::string &name |
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| 51 | // - size_t nways : number of associativity levels |
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| 52 | // - size_t nsets : number of sets |
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| 53 | // - size_t nwords : number of words in a cache line |
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| 54 | // The nways, nsets, nwords parameters must be power of 2 |
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| 55 | // The nsets parameter cannot be larger than 1024 |
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| 56 | // The nways parameter cannot be larger than 16 |
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| 57 | // The nwords parameter cannot be larger than 64 |
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| 58 | ///////////////////////////////////////////////////////////////////////////////// |
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| 59 | // Template parameter is : |
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| 60 | // - addr_t : address format to access the cache |
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| 61 | ///////////////////////////////////////////////////////////////////////////////// |
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| 62 | |
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| 63 | #ifndef SOCLIB_GENERIC_CACHE_H |
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| 64 | #define SOCLIB_GENERIC_CACHE_H |
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| 65 | |
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| 66 | #include <systemc> |
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| 67 | #include <cassert> |
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| 68 | #include "arithmetics.h" |
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| 69 | #include "static_assert.h" |
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| 70 | #include "mapping_table.h" |
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| 71 | #include <cstring> |
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| 72 | |
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| 73 | namespace soclib { |
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| 74 | |
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| 75 | enum cache_slot_state_e |
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| 76 | { |
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| 77 | CACHE_SLOT_STATE_EMPTY, |
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[477] | 78 | CACHE_SLOT_STATE_VALID_CC, |
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[297] | 79 | CACHE_SLOT_STATE_ZOMBI, |
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[477] | 80 | CACHE_SLOT_STATE_VALID_NCC, |
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[297] | 81 | }; |
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| 82 | |
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| 83 | ////////////////////////// |
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| 84 | template<typename addr_t> |
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| 85 | class GenericCache |
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| 86 | ////////////////////////// |
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| 87 | { |
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| 88 | typedef uint32_t data_t; |
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| 89 | typedef uint32_t be_t; |
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| 90 | |
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| 91 | data_t *r_data ; |
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[393] | 92 | addr_t *r_tag ; |
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[297] | 93 | int *r_state; |
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| 94 | bool *r_lru ; |
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| 95 | |
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| 96 | size_t m_ways; |
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| 97 | size_t m_sets; |
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| 98 | size_t m_words; |
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| 99 | |
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| 100 | const soclib::common::AddressMaskingTable<addr_t> m_x ; |
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| 101 | const soclib::common::AddressMaskingTable<addr_t> m_y ; |
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| 102 | const soclib::common::AddressMaskingTable<addr_t> m_z ; |
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| 103 | |
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| 104 | ////////////////////////////////////////////////////////////// |
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| 105 | inline data_t &cache_data(size_t way, size_t set, size_t word) |
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| 106 | { |
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| 107 | return r_data[(way*m_sets*m_words)+(set*m_words)+word]; |
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| 108 | } |
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| 109 | |
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| 110 | ////////////////////////////////////////////// |
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[393] | 111 | inline addr_t &cache_tag(size_t way, size_t set) |
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[297] | 112 | { |
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| 113 | return r_tag[(way*m_sets)+set]; |
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| 114 | } |
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| 115 | |
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| 116 | ////////////////////////////////////////////// |
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| 117 | inline bool &cache_lru(size_t way, size_t set) |
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| 118 | { |
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| 119 | return r_lru[(way*m_sets)+set]; |
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| 120 | } |
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[477] | 121 | |
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[297] | 122 | ////////////////////////////////////////////// |
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| 123 | inline int &cache_state(size_t way, size_t set) |
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| 124 | { |
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| 125 | return r_state[(way*m_sets)+set]; |
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| 126 | } |
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| 127 | |
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[477] | 128 | |
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[297] | 129 | ///////////////////////////////////////////////// |
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| 130 | inline void cache_set_lru(size_t way, size_t set) |
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| 131 | { |
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| 132 | size_t way2; |
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| 133 | |
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| 134 | cache_lru(way, set) = true; |
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| 135 | |
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| 136 | for (way2 = 0; way2 < m_ways; way2++ ) |
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| 137 | { |
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| 138 | if (cache_lru(way2, set) == false) return; |
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| 139 | } |
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| 140 | // all lines are new -> they all become old |
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| 141 | for (way2 = 0; way2 < m_ways; way2++ ) |
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| 142 | { |
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| 143 | cache_lru(way2, set) = false; |
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| 144 | } |
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| 145 | } |
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| 146 | |
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[393] | 147 | //////////////////////////////// |
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[297] | 148 | inline data_t be2mask( be_t be ) |
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| 149 | { |
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| 150 | data_t mask = 0; |
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| 151 | if ( (be & 0x1) == 0x1 ) mask = mask | 0x000000FF; |
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| 152 | if ( (be & 0x2) == 0x2 ) mask = mask | 0x0000FF00; |
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| 153 | if ( (be & 0x4) == 0x4 ) mask = mask | 0x00FF0000; |
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| 154 | if ( (be & 0x8) == 0x8 ) mask = mask | 0xFF000000; |
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| 155 | return mask; |
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| 156 | } |
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| 157 | |
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| 158 | public: |
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| 159 | |
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[393] | 160 | ////////////////////////////////////////// |
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[297] | 161 | GenericCache( const std::string &name, |
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| 162 | size_t nways, |
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| 163 | size_t nsets, |
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| 164 | size_t nwords) |
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| 165 | : m_ways(nways), |
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| 166 | m_sets(nsets), |
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| 167 | m_words(nwords), |
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| 168 | |
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| 169 | #define l2 soclib::common::uint32_log2 |
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| 170 | |
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| 171 | m_x( l2(nwords), l2(sizeof(data_t))), |
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| 172 | m_y( l2(nsets), l2(nwords) + l2(sizeof(data_t))), |
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| 173 | m_z( 8*sizeof(addr_t) - l2(nsets) - l2(nwords) - l2(sizeof(data_t)), |
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| 174 | l2(nsets) + l2(nwords) + l2(sizeof(data_t))) |
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| 175 | #undef l2 |
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| 176 | { |
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| 177 | assert(IS_POW_OF_2(nways)); |
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| 178 | assert(IS_POW_OF_2(nsets)); |
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| 179 | assert(IS_POW_OF_2(nwords)); |
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| 180 | assert(nwords); |
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| 181 | assert(nsets); |
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| 182 | assert(nways); |
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| 183 | assert(nwords <= 64); |
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| 184 | assert(nsets <= 1024); |
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| 185 | assert(nways <= 16); |
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| 186 | |
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| 187 | #ifdef GENERIC_CACHE_DEBUG |
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[393] | 188 | std::cout << "constructing " << name << std::endl |
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| 189 | << "- nways = " << nways << std::endl |
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| 190 | << "- nsets = " << nsets << std::endl |
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| 191 | << "- nwords = " << nwords << std::endl |
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| 192 | << " m_x: " << m_x |
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| 193 | << " m_y: " << m_y |
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| 194 | << " m_z: " << m_z |
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| 195 | << std::endl; |
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[297] | 196 | #endif |
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| 197 | |
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| 198 | r_data = new data_t[nways*nsets*nwords]; |
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[393] | 199 | r_tag = new addr_t[nways*nsets]; |
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[297] | 200 | r_state = new int[nways*nsets]; |
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| 201 | r_lru = new bool[nways*nsets]; |
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| 202 | } |
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| 203 | |
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| 204 | //////////////// |
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| 205 | ~GenericCache() |
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| 206 | { |
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| 207 | delete [] r_data; |
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| 208 | delete [] r_tag; |
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| 209 | delete [] r_state; |
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| 210 | delete [] r_lru; |
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| 211 | } |
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| 212 | |
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| 213 | //////////////////// |
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| 214 | inline void reset( ) |
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| 215 | { |
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| 216 | std::memset(r_data, 0, sizeof(*r_data)*m_ways*m_sets*m_words); |
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| 217 | std::memset(r_tag, 0, sizeof(*r_tag)*m_ways*m_sets); |
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| 218 | std::memset(r_state, CACHE_SLOT_STATE_EMPTY, sizeof(*r_state)*m_ways*m_sets); |
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| 219 | std::memset(r_lru, 0, sizeof(*r_lru)*m_ways*m_sets); |
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| 220 | } |
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| 221 | |
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[477] | 222 | inline int get_cache_state(int way, int set) |
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| 223 | { |
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| 224 | return cache_state(way,set); |
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| 225 | } |
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| 226 | |
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[297] | 227 | ///////////////////////////////////////////////////////////////////// |
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| 228 | // Read a single 32 bits word. |
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| 229 | // returns true if (matching tag) and (state == VALID) |
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| 230 | // Both data & directory are accessed. |
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| 231 | ///////////////////////////////////////////////////////////////////// |
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| 232 | inline bool read( addr_t ad, |
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| 233 | data_t* dt) |
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| 234 | { |
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[393] | 235 | const addr_t tag = m_z[ad]; |
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[297] | 236 | const size_t set = m_y[ad]; |
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| 237 | const size_t word = m_x[ad]; |
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| 238 | |
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| 239 | for ( size_t way = 0; way < m_ways; way++ ) |
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| 240 | { |
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| 241 | if ( (tag == cache_tag(way, set)) |
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[477] | 242 | && ( (cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC) or (cache_state(way, set) == CACHE_SLOT_STATE_VALID_NCC)) ) |
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[297] | 243 | { |
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| 244 | *dt = cache_data(way, set, word); |
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| 245 | cache_set_lru(way, set); |
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| 246 | return true; |
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| 247 | } |
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| 248 | } |
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| 249 | return false; |
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| 250 | } |
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| 251 | |
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| 252 | //////////////////////////////////////////////////////////////////// |
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| 253 | // Read a single 32 bits word. |
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| 254 | // returns true if (matching tag) and (state == VALID) |
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| 255 | // Both data & directory are accessed. |
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| 256 | // The selected way, set and word index are returned in case of hit. |
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| 257 | ///////////////////////////////////////////////////////////////////// |
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| 258 | inline bool read( addr_t ad, |
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| 259 | data_t* dt, |
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| 260 | size_t* selway, |
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| 261 | size_t* selset, |
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| 262 | size_t* selword) |
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| 263 | { |
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[393] | 264 | const addr_t tag = m_z[ad]; |
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[297] | 265 | const size_t set = m_y[ad]; |
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| 266 | const size_t word = m_x[ad]; |
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| 267 | |
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| 268 | for ( size_t way = 0; way < m_ways; way++ ) |
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| 269 | { |
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| 270 | if ( (tag == cache_tag(way, set)) and |
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[477] | 271 | ( (cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC)or (cache_state(way, set) == CACHE_SLOT_STATE_VALID_NCC))) |
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[297] | 272 | { |
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| 273 | *selway = way; |
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| 274 | *selset = set; |
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| 275 | *selword = word; |
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| 276 | *dt = cache_data(way, set, word); |
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| 277 | cache_set_lru(way, set); |
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| 278 | return true; |
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| 279 | } |
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| 280 | } |
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| 281 | return false; |
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| 282 | } |
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| 283 | |
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| 284 | //////////////////////////////////////////////////////////////////// |
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| 285 | // Read a single 32 bits word when the ZOMBI state is used. |
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| 286 | // Both data and directory are accessed. |
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| 287 | // returns the access status in the state argument: |
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| 288 | // - VALID : (matching tag) and (state == VALID) |
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| 289 | // - ZOMBI : (matching tag) and (state == ZOMBI) |
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| 290 | // - MISS : no matching tag or EMPTY state |
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| 291 | // If VALID or ZOMBI, the data, the way, set and word index are |
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| 292 | // returned in the other arguments. |
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| 293 | //////////////////////////////////////////////////////////////////// |
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| 294 | inline void read( addr_t ad, |
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| 295 | data_t* dt, |
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| 296 | size_t* selway, |
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| 297 | size_t* selset, |
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| 298 | size_t* selword, |
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| 299 | int* state ) |
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| 300 | { |
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[393] | 301 | const addr_t tag = m_z[ad]; |
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[297] | 302 | const size_t set = m_y[ad]; |
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| 303 | const size_t word = m_x[ad]; |
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| 304 | |
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| 305 | // default return values |
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| 306 | *state = CACHE_SLOT_STATE_EMPTY; |
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| 307 | *selway = 0; |
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| 308 | *selset = 0; |
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| 309 | *selword = 0; |
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| 310 | *dt = 0; |
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| 311 | |
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| 312 | for ( size_t way = 0; way < m_ways; way++ ) |
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| 313 | { |
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| 314 | if ( tag == cache_tag(way, set) ) // matching tag |
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| 315 | { |
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| 316 | |
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[477] | 317 | if ( cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC ) |
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[297] | 318 | { |
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[477] | 319 | *state = CACHE_SLOT_STATE_VALID_CC; |
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[297] | 320 | *selway = way; |
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| 321 | *selset = set; |
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| 322 | *selword = word; |
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| 323 | *dt = cache_data(way, set, word); |
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| 324 | cache_set_lru(way, set); |
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| 325 | } |
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[477] | 326 | else if ( cache_state(way, set) == CACHE_SLOT_STATE_VALID_NCC ) |
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| 327 | { |
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| 328 | *state = CACHE_SLOT_STATE_VALID_NCC; |
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| 329 | *selway = way; |
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| 330 | *selset = set; |
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| 331 | *selword = word; |
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| 332 | *dt = cache_data(way, set, word); |
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| 333 | cache_set_lru(way, set); |
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| 334 | } |
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[297] | 335 | else if ( cache_state(way, set) == CACHE_SLOT_STATE_ZOMBI ) |
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| 336 | { |
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| 337 | *state = CACHE_SLOT_STATE_ZOMBI; |
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| 338 | *selway = way; |
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| 339 | *selset = set; |
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| 340 | *selword = word; |
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| 341 | } |
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| 342 | } |
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| 343 | } |
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| 344 | } |
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| 345 | |
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| 346 | //////////////////////////////////////////////////////////////////// |
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| 347 | // Read a single 32 bits word, without LRU update. |
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| 348 | // returns true if (matching tag) and (state == VALID) |
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| 349 | // Both data & directory are accessed. |
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| 350 | // The selected way, set and word index are returned in case of hit. |
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| 351 | ///////////////////////////////////////////////////////////////////// |
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| 352 | inline bool read_neutral( addr_t ad, |
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| 353 | data_t* dt, |
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| 354 | size_t* selway, |
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| 355 | size_t* selset, |
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| 356 | size_t* selword) |
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| 357 | { |
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[393] | 358 | const addr_t tag = m_z[ad]; |
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[297] | 359 | const size_t set = m_y[ad]; |
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| 360 | const size_t word = m_x[ad]; |
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| 361 | |
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| 362 | for ( size_t way = 0; way < m_ways; way++ ) |
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| 363 | { |
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| 364 | if ( (tag == cache_tag(way, set)) |
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[477] | 365 | && ( (cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC) or (cache_state(way, set) == CACHE_SLOT_STATE_VALID_NCC) ) ) |
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[297] | 366 | { |
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| 367 | *selway = way; |
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| 368 | *selset = set; |
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| 369 | *selword = word; |
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| 370 | *dt = cache_data(way, set, word); |
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| 371 | return true; |
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| 372 | } |
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| 373 | } |
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| 374 | return false; |
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| 375 | } |
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| 376 | |
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| 377 | ///////////////////////////////////////////////////////////////////////////// |
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| 378 | // Read one or two 32 bits word. |
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| 379 | // Both data & directory are accessed. |
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| 380 | // Hit if (matching tag) and (valid == true) and (zombi == false) |
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| 381 | // If the addressed word is not the last in the cache line, |
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| 382 | // two successive words are returned. |
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| 383 | // The selected way, set and first word index are returned in case of hit. |
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| 384 | // This function is used by the cc_vcache to get a 64 bits page table entry. |
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| 385 | ///////////////////////////////////////////////////////////////////////////// |
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| 386 | inline bool read( addr_t ad, |
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| 387 | data_t* dt, |
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| 388 | data_t* dt_next, |
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| 389 | size_t* selway, |
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| 390 | size_t* selset, |
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| 391 | size_t* selword) |
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| 392 | { |
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[393] | 393 | const addr_t tag = m_z[ad]; |
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[297] | 394 | const size_t set = m_y[ad]; |
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| 395 | const size_t word = m_x[ad]; |
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| 396 | |
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| 397 | for ( size_t way = 0; way < m_ways; way++ ) |
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| 398 | { |
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| 399 | if ( (tag == cache_tag(way, set)) |
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[477] | 400 | &&( (cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC) ) ) |
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[297] | 401 | { |
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| 402 | *dt = cache_data(way, set, word); |
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| 403 | if ( word+1 < m_words) |
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| 404 | { |
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| 405 | *dt_next = cache_data(way, set, word+1); |
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| 406 | } |
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| 407 | *selway = way; |
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| 408 | *selset = set; |
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| 409 | *selword = word; |
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| 410 | cache_set_lru(way, set); |
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| 411 | return true; |
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| 412 | } |
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| 413 | } |
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| 414 | return false; |
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| 415 | } |
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| 416 | |
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[337] | 417 | //////////////////////////////////////////////////////////////////// |
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| 418 | // Read one or two 32 bits word. |
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| 419 | // Both data and directory are accessed. |
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| 420 | // returns the access status in the state argument: |
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| 421 | // - VALID : (matching tag) and (state == VALID) |
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| 422 | // - ZOMBI : (matching tag) and (state == ZOMBI) |
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| 423 | // - MISS : no matching tag or EMPTY state |
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| 424 | // If VALID or ZOMBI, the data, the way, set and word index are |
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| 425 | // returned in the other arguments. |
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| 426 | //////////////////////////////////////////////////////////////////// |
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| 427 | inline void read( addr_t ad, |
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| 428 | data_t* dt, |
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| 429 | data_t* dt_next, |
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| 430 | size_t* selway, |
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| 431 | size_t* selset, |
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| 432 | size_t* selword, |
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| 433 | int* state ) |
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| 434 | { |
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[393] | 435 | const addr_t tag = m_z[ad]; |
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[337] | 436 | const size_t set = m_y[ad]; |
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| 437 | const size_t word = m_x[ad]; |
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| 438 | |
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| 439 | // default return values |
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| 440 | *state = CACHE_SLOT_STATE_EMPTY; |
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| 441 | *selway = 0; |
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| 442 | *selset = 0; |
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| 443 | *selword = 0; |
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| 444 | *dt = 0; |
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| 445 | |
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| 446 | for ( size_t way = 0; way < m_ways; way++ ) |
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| 447 | { |
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| 448 | if ( tag == cache_tag(way, set) ) // matching tag |
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| 449 | { |
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| 450 | |
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[477] | 451 | if ( cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC ) |
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[337] | 452 | { |
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[477] | 453 | *state = CACHE_SLOT_STATE_VALID_CC; |
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[337] | 454 | *selway = way; |
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| 455 | *selset = set; |
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| 456 | *selword = word; |
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| 457 | *dt = cache_data(way, set, word); |
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| 458 | if ( word+1 < m_words) |
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| 459 | { |
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| 460 | *dt_next = cache_data(way, set, word+1); |
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| 461 | } |
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| 462 | cache_set_lru(way, set); |
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| 463 | } |
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[477] | 464 | |
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| 465 | else if ( cache_state(way, set) == CACHE_SLOT_STATE_VALID_NCC ) |
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| 466 | { |
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| 467 | *state = CACHE_SLOT_STATE_VALID_NCC; |
---|
| 468 | *selway = way; |
---|
| 469 | *selset = set; |
---|
| 470 | *selword = word; |
---|
| 471 | *dt = cache_data(way, set, word); |
---|
| 472 | if ( word+1 < m_words) |
---|
| 473 | { |
---|
| 474 | *dt_next = cache_data(way, set, word+1); |
---|
| 475 | } |
---|
| 476 | cache_set_lru(way, set); |
---|
| 477 | } |
---|
| 478 | |
---|
[337] | 479 | else if ( cache_state(way, set) == CACHE_SLOT_STATE_ZOMBI ) |
---|
| 480 | { |
---|
| 481 | *state = CACHE_SLOT_STATE_ZOMBI; |
---|
| 482 | *selway = way; |
---|
| 483 | *selset = set; |
---|
| 484 | *selword = word; |
---|
| 485 | } |
---|
| 486 | } |
---|
| 487 | } |
---|
| 488 | } |
---|
| 489 | |
---|
[297] | 490 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 491 | // Checks the cache state for a given address. |
---|
| 492 | // Only the directory is accessed. |
---|
| 493 | // returns true if (matching tag) and (state == VALID) |
---|
| 494 | // The selected way, set and first word index are returned in case of hit. |
---|
| 495 | // This function can be used when we need to access the directory |
---|
| 496 | // while we write in the data part with a different address in the same cycle. |
---|
| 497 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 498 | inline bool hit( addr_t ad, |
---|
| 499 | size_t* selway, |
---|
| 500 | size_t* selset, |
---|
| 501 | size_t* selword) |
---|
| 502 | { |
---|
[393] | 503 | const addr_t tag = m_z[ad]; |
---|
[297] | 504 | const size_t set = m_y[ad]; |
---|
| 505 | const size_t word = m_x[ad]; |
---|
| 506 | |
---|
| 507 | for ( size_t way = 0; way < m_ways; way++ ) |
---|
| 508 | { |
---|
| 509 | if ( (tag == cache_tag(way, set)) |
---|
[477] | 510 | && ( (cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC)or(cache_state(way, set) == CACHE_SLOT_STATE_VALID_NCC) ) ) |
---|
[297] | 511 | { |
---|
| 512 | *selway = way; |
---|
| 513 | *selset = set; |
---|
| 514 | *selword = word; |
---|
| 515 | cache_set_lru(way, set); |
---|
| 516 | return true; |
---|
| 517 | } |
---|
| 518 | } |
---|
| 519 | return false; |
---|
| 520 | } |
---|
| 521 | |
---|
| 522 | /////////////////////////////////////////////////////////////////////////////// |
---|
[393] | 523 | // Checks the cache state for a given address, when the ZOMBI state is used. |
---|
[297] | 524 | // Only the directory is accessed. |
---|
| 525 | // Returns the access status in the state argument: |
---|
| 526 | // - VALID if (matching tag) and (state == VALID) |
---|
| 527 | // - ZOMBI if (matching tag) and (state == ZOMBI) |
---|
| 528 | // - EMPTY if no match or (state == EMPTY) |
---|
| 529 | // The selected way, set and first word index are returned if not empty. |
---|
| 530 | // This function can be used when we need to access the directory |
---|
| 531 | // while we write in the data part with a different address in the same cycle. |
---|
| 532 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 533 | inline void read_dir( addr_t ad, |
---|
| 534 | int* state, |
---|
| 535 | size_t* way, |
---|
| 536 | size_t* set, |
---|
| 537 | size_t* word) |
---|
| 538 | { |
---|
[393] | 539 | const addr_t ad_tag = m_z[ad]; |
---|
[297] | 540 | const size_t ad_set = m_y[ad]; |
---|
| 541 | const size_t ad_word = m_x[ad]; |
---|
| 542 | for ( size_t _way = 0; _way < m_ways; _way++ ) |
---|
| 543 | { |
---|
| 544 | if ( (ad_tag == cache_tag(_way, ad_set) ) and |
---|
| 545 | (cache_state(_way, ad_set) != CACHE_SLOT_STATE_EMPTY) ) |
---|
| 546 | { |
---|
| 547 | *state = cache_state(_way, ad_set); |
---|
| 548 | *way = _way; |
---|
| 549 | *set = ad_set; |
---|
| 550 | *word = ad_word; |
---|
| 551 | return; |
---|
| 552 | } |
---|
| 553 | } |
---|
| 554 | |
---|
| 555 | // return value if not (VALID or ZOMBI) |
---|
| 556 | *state = CACHE_SLOT_STATE_EMPTY; |
---|
| 557 | } |
---|
| 558 | |
---|
| 559 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 560 | // Checks the cache state for a slot (set,way), when the ZOMBI state is used. |
---|
| 561 | // Only the directory is accessed. |
---|
| 562 | // Returns the access status and the tag value in the state and tag argument. |
---|
| 563 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 564 | inline void read_dir( size_t way, |
---|
| 565 | size_t set, |
---|
[393] | 566 | addr_t* tag, |
---|
[297] | 567 | int* state ) |
---|
| 568 | { |
---|
| 569 | *state = cache_state(way, set); |
---|
| 570 | *tag = cache_tag(way, set); |
---|
| 571 | } |
---|
| 572 | |
---|
| 573 | //////////////////////////////////////////// |
---|
[393] | 574 | inline addr_t get_tag(size_t way, size_t set) |
---|
[297] | 575 | { |
---|
| 576 | return cache_tag(way, set); |
---|
| 577 | } |
---|
| 578 | |
---|
| 579 | /////////////////////////////////////////////////////////////////// |
---|
| 580 | // This function writes a complete 32 bits word |
---|
| 581 | // It does not use the directory and cannot miss. |
---|
| 582 | ////////////////////////////////////////////////////////////////// |
---|
| 583 | inline void write(size_t way, |
---|
| 584 | size_t set, |
---|
| 585 | size_t word, |
---|
| 586 | data_t data) |
---|
| 587 | { |
---|
| 588 | cache_data(way, set, word) = data; |
---|
| 589 | cache_set_lru(way, set); |
---|
| 590 | } |
---|
| 591 | |
---|
| 592 | //////////////////////////////////////////////////////////////////////////// |
---|
| 593 | // this function writes up to 4 bytes, taking into account the byte enable. |
---|
| 594 | // It does not use the directory and cannot miss. |
---|
| 595 | //////////////////////////////////////////////////////////////////////////// |
---|
| 596 | inline void write(size_t way, |
---|
| 597 | size_t set, |
---|
| 598 | size_t word, |
---|
| 599 | data_t data, |
---|
| 600 | be_t be) |
---|
| 601 | { |
---|
| 602 | data_t mask = be2mask(be); |
---|
| 603 | data_t prev = cache_data(way, set, word); |
---|
| 604 | cache_data(way, set, word) = (mask & data) | (~mask & prev); |
---|
| 605 | cache_set_lru(way, set); |
---|
| 606 | } |
---|
| 607 | |
---|
| 608 | ////////////////////////////////////////////////////////////////////////// |
---|
| 609 | // This function invalidates a cache line identified by the set and way. |
---|
| 610 | // It returns true if the line was valid, and returns the line index. |
---|
| 611 | ////////////////////////////////////////////////////////////////////////// |
---|
| 612 | inline bool inval(size_t way, |
---|
| 613 | size_t set, |
---|
| 614 | addr_t* nline) |
---|
| 615 | { |
---|
[477] | 616 | if( (cache_state(way,set) == CACHE_SLOT_STATE_VALID_CC) or (cache_state(way,set) == CACHE_SLOT_STATE_VALID_NCC)) |
---|
[297] | 617 | { |
---|
| 618 | cache_state(way,set) = CACHE_SLOT_STATE_EMPTY; |
---|
| 619 | *nline = (data_t)cache_tag(way,set)* m_sets + set; |
---|
| 620 | return true; |
---|
| 621 | } |
---|
| 622 | return false; |
---|
| 623 | } |
---|
| 624 | |
---|
| 625 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 626 | // This function selects a victim slot in an associative set. |
---|
| 627 | // It cannot fail, as a slot in ZOMBI state is considered EMPTY. |
---|
| 628 | // - we search first an EMPTY slot |
---|
| 629 | // - if no EMPTY slot, we search an OLD slot, using lru |
---|
| 630 | // It returns the line index (Z + Y fields), the selected slot way and set, |
---|
| 631 | // and a Boolean indicating that a cleanup is requested. |
---|
| 632 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 633 | inline bool victim_select(addr_t ad, |
---|
| 634 | addr_t* victim, |
---|
| 635 | size_t* way, |
---|
| 636 | size_t* set) |
---|
| 637 | { |
---|
| 638 | bool found = false; |
---|
| 639 | bool cleanup = false; |
---|
| 640 | |
---|
| 641 | *set = m_y[ad]; |
---|
| 642 | *way = 0; |
---|
| 643 | |
---|
| 644 | // Search first empty slot |
---|
| 645 | for ( size_t _way = 0 ; _way < m_ways && !found ; _way++ ) |
---|
| 646 | { |
---|
[477] | 647 | if( ( cache_state(_way, *set) != CACHE_SLOT_STATE_VALID_CC ) and ( cache_state(_way, *set) != CACHE_SLOT_STATE_VALID_NCC )) // empty |
---|
[297] | 648 | { |
---|
| 649 | found = true; |
---|
| 650 | cleanup = false; |
---|
| 651 | *way = _way; |
---|
| 652 | } |
---|
| 653 | } |
---|
| 654 | |
---|
| 655 | // If no empty slot, search first old slot (lru == false) |
---|
| 656 | if ( !found ) |
---|
| 657 | { |
---|
| 658 | for ( size_t _way = 0 ; _way < m_ways && !found ; _way++ ) |
---|
| 659 | { |
---|
| 660 | if ( not cache_lru(_way, *set) ) |
---|
| 661 | { |
---|
| 662 | found = true; |
---|
| 663 | cleanup = true; |
---|
| 664 | *way = _way; |
---|
| 665 | } |
---|
| 666 | } |
---|
| 667 | } |
---|
| 668 | |
---|
| 669 | assert(found && "all ways can't be new at the same time"); |
---|
| 670 | *victim = (addr_t)((cache_tag(*way,*set) * m_sets) + *set); |
---|
| 671 | return cleanup; |
---|
| 672 | } |
---|
| 673 | |
---|
| 674 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 675 | // This function selects a victim slot in an associative set. |
---|
| 676 | // It can fail if all ways are in ZOMBI state. |
---|
| 677 | // - we search first an EMPTY slot |
---|
| 678 | // - if no empty slot, we search an OLD slot not in ZOMBI state, |
---|
| 679 | // - if not found, we take the first not ZOMBI slot. |
---|
| 680 | // It returns the line index (Z + Y fields), the selected slot way and set, |
---|
| 681 | // and two Boolean indicating success and a required cleanup. |
---|
| 682 | ////////////////////////////////////////////////////////////////////////////////// |
---|
| 683 | inline void read_select(addr_t ad, |
---|
| 684 | addr_t* victim, |
---|
| 685 | size_t* way, |
---|
| 686 | size_t* set, |
---|
| 687 | bool* found, |
---|
| 688 | bool* cleanup ) |
---|
| 689 | { |
---|
[303] | 690 | size_t _set = m_y[ad]; |
---|
| 691 | |
---|
| 692 | *found = false; |
---|
| 693 | |
---|
[297] | 694 | // Search first empty slot |
---|
[303] | 695 | for ( size_t _way = 0 ; _way < m_ways && !(*found) ; _way++ ) |
---|
[297] | 696 | { |
---|
[303] | 697 | if ( cache_state(_way, _set) == CACHE_SLOT_STATE_EMPTY ) |
---|
[297] | 698 | { |
---|
| 699 | *found = true; |
---|
| 700 | *cleanup = false; |
---|
| 701 | *way = _way; |
---|
| 702 | *set = m_y[ad]; |
---|
| 703 | return; |
---|
| 704 | } |
---|
| 705 | } |
---|
[477] | 706 | ////////////////////////////////////////////////////////////// |
---|
| 707 | /*for ( size_t _way = 0 ; _way < m_ways && !(*found) ; _way++ ) |
---|
| 708 | { |
---|
| 709 | if ( not cache_lru(_way, _set) and |
---|
| 710 | (cache_state(_way, _set) != CACHE_SLOT_STATE_ZOMBI) and |
---|
| 711 | (cache_state(_way, _set) == CACHE_SLOT_STATE_VALID_NCC) ) |
---|
| 712 | { |
---|
| 713 | *found = true; |
---|
| 714 | *cleanup = true; |
---|
| 715 | *way = _way; |
---|
| 716 | *set = m_y[ad]; |
---|
| 717 | *victim = (addr_t)((cache_tag(*way,_set) * m_sets) + _set); |
---|
| 718 | return; |
---|
| 719 | } |
---|
| 720 | }*/ |
---|
[297] | 721 | // Search first not zombi old slot |
---|
[303] | 722 | for ( size_t _way = 0 ; _way < m_ways && !(*found) ; _way++ ) |
---|
| 723 | { |
---|
| 724 | if ( not cache_lru(_way, _set) and |
---|
| 725 | (cache_state(_way, _set) != CACHE_SLOT_STATE_ZOMBI) ) |
---|
[297] | 726 | { |
---|
[303] | 727 | *found = true; |
---|
| 728 | *cleanup = true; |
---|
| 729 | *way = _way; |
---|
| 730 | *set = m_y[ad]; |
---|
[393] | 731 | *victim = cache_tag(*way,_set) * m_sets + _set; |
---|
[303] | 732 | return; |
---|
[297] | 733 | } |
---|
| 734 | } |
---|
| 735 | // Search first not zombi slot |
---|
[303] | 736 | for ( size_t _way = 0 ; _way < m_ways && !(*found) ; _way++ ) |
---|
| 737 | { |
---|
| 738 | if ( cache_state(_way, _set) != CACHE_SLOT_STATE_ZOMBI) |
---|
[297] | 739 | { |
---|
[303] | 740 | *found = true; |
---|
| 741 | *cleanup = true; |
---|
| 742 | *way = _way; |
---|
| 743 | *set = m_y[ad]; |
---|
[393] | 744 | *victim = cache_tag(*way,_set) * m_sets + _set; |
---|
[303] | 745 | return; |
---|
[297] | 746 | } |
---|
| 747 | } |
---|
| 748 | |
---|
| 749 | // no slot found... |
---|
| 750 | *found = false; |
---|
| 751 | *cleanup = false; |
---|
| 752 | } |
---|
| 753 | |
---|
| 754 | ////////////////////////////////////////////////////////////////// |
---|
| 755 | // This function update the directory part of a slot |
---|
| 756 | // identified by the way & set. |
---|
| 757 | ////////////////////////////////////////////////////////////////// |
---|
| 758 | inline void victim_update_tag( addr_t ad, |
---|
| 759 | size_t way, |
---|
| 760 | size_t set ) |
---|
| 761 | { |
---|
[393] | 762 | addr_t tag = m_z[ad]; |
---|
[297] | 763 | |
---|
| 764 | cache_tag(way, set) = tag; |
---|
[477] | 765 | cache_state(way, set) = CACHE_SLOT_STATE_VALID_CC; |
---|
[297] | 766 | cache_set_lru(way, set); |
---|
| 767 | } |
---|
| 768 | |
---|
| 769 | ////////////////////////////////////////////////////////////////// |
---|
| 770 | // This function write the directory part of a slot |
---|
| 771 | // identified by the way & set, when using the ZOMBI state. |
---|
| 772 | ////////////////////////////////////////////////////////////////// |
---|
| 773 | inline void write_dir( addr_t ad, |
---|
| 774 | size_t way, |
---|
| 775 | size_t set, |
---|
| 776 | int state) |
---|
| 777 | { |
---|
[393] | 778 | addr_t tag = m_z[ad]; |
---|
[297] | 779 | |
---|
[477] | 780 | assert( ( (state == CACHE_SLOT_STATE_VALID_CC) or |
---|
| 781 | (state == CACHE_SLOT_STATE_VALID_NCC) or |
---|
[297] | 782 | (state == CACHE_SLOT_STATE_ZOMBI) or |
---|
| 783 | (state == CACHE_SLOT_STATE_EMPTY) ) and |
---|
| 784 | "illegal slot state argument in Generic Cache write_dir()"); |
---|
| 785 | |
---|
| 786 | assert( (way < m_ways) and |
---|
| 787 | "too large way index argument in Generic Cache write_dir()"); |
---|
| 788 | |
---|
| 789 | assert( (set < m_sets) and |
---|
| 790 | "too large set index argument in Generic Cache write_dir()"); |
---|
| 791 | |
---|
| 792 | cache_tag(way, set) = tag; |
---|
| 793 | cache_state(way, set) = state; |
---|
| 794 | |
---|
[477] | 795 | if ( (state == CACHE_SLOT_STATE_VALID_CC) or (state == CACHE_SLOT_STATE_VALID_NCC) ) cache_set_lru(way, set); |
---|
[297] | 796 | } |
---|
| 797 | |
---|
[365] | 798 | ////////////////////////////////////////////////////////////////// |
---|
[393] | 799 | // This function change the state of a slot |
---|
[365] | 800 | // identified by the way & set, when using the ZOMBI state. |
---|
[393] | 801 | // It does not affect the tag |
---|
[365] | 802 | ////////////////////////////////////////////////////////////////// |
---|
| 803 | inline void write_dir( size_t way, |
---|
| 804 | size_t set, |
---|
| 805 | int state) |
---|
| 806 | { |
---|
[477] | 807 | assert( ( (state == CACHE_SLOT_STATE_VALID_CC) or |
---|
| 808 | (state == CACHE_SLOT_STATE_VALID_NCC) or |
---|
[365] | 809 | (state == CACHE_SLOT_STATE_ZOMBI) or |
---|
| 810 | (state == CACHE_SLOT_STATE_EMPTY) ) and |
---|
| 811 | "illegal slot state argument in Generic Cache write_dir()"); |
---|
| 812 | |
---|
| 813 | assert( (way < m_ways) and |
---|
| 814 | "too large way index argument in Generic Cache write_dir()"); |
---|
| 815 | |
---|
| 816 | assert( (set < m_sets) and |
---|
| 817 | "too large set index argument in Generic Cache write_dir()"); |
---|
| 818 | |
---|
| 819 | cache_state(way, set) = state; |
---|
| 820 | |
---|
[477] | 821 | if ( (state == CACHE_SLOT_STATE_VALID_CC) or (state == CACHE_SLOT_STATE_VALID_NCC) ) cache_set_lru(way, set); |
---|
[365] | 822 | } |
---|
| 823 | |
---|
[297] | 824 | /////////////////////////////////////////////////////////////////// |
---|
| 825 | // This function writes a full cache line in one single cycle. |
---|
| 826 | // The target slot is identified by the way & set arguments. |
---|
| 827 | // Both DATA and DIRECTORY are written |
---|
| 828 | /////////////////////////////////////////////////////////////////// |
---|
| 829 | inline void update(addr_t ad, |
---|
| 830 | size_t way, |
---|
| 831 | size_t set, |
---|
| 832 | data_t* buf) |
---|
| 833 | { |
---|
[393] | 834 | addr_t tag = m_z[ad]; |
---|
[297] | 835 | |
---|
| 836 | cache_tag(way, set) = tag; |
---|
[477] | 837 | cache_state(way, set) = CACHE_SLOT_STATE_VALID_CC; |
---|
[297] | 838 | cache_set_lru(way, set); |
---|
| 839 | for ( size_t word = 0 ; word < m_words ; word++ ) |
---|
| 840 | { |
---|
| 841 | cache_data(way, set, word) = buf[word] ; |
---|
| 842 | } |
---|
| 843 | } |
---|
| 844 | |
---|
| 845 | /////////////////////////// |
---|
| 846 | void fileTrace(FILE* file) |
---|
| 847 | { |
---|
| 848 | for( size_t nway = 0 ; nway < m_ways ; nway++) |
---|
| 849 | { |
---|
| 850 | for( size_t nset = 0 ; nset < m_sets ; nset++) |
---|
| 851 | { |
---|
| 852 | fprintf(file, "%d / ", (int)cache_state(nway, nset)); |
---|
| 853 | fprintf(file, "way %d / ", (int)nway); |
---|
| 854 | fprintf(file, "set %d / ", (int)nset); |
---|
| 855 | fprintf(file, "@ = %08zX / ", |
---|
| 856 | ((cache_tag(nway, nset)*m_sets+nset)*m_words*4)); |
---|
| 857 | for( size_t nword = m_words ; nword > 0 ; nword--) |
---|
| 858 | { |
---|
| 859 | unsigned int data = cache_data(nway, nset, nword-1); |
---|
| 860 | fprintf(file, "%08X ", data ); |
---|
| 861 | } |
---|
| 862 | fprintf(file, "\n"); |
---|
| 863 | } |
---|
| 864 | } |
---|
| 865 | } |
---|
| 866 | |
---|
| 867 | //////////////////////// |
---|
| 868 | inline void printTrace() |
---|
| 869 | { |
---|
| 870 | for ( size_t way = 0; way < m_ways ; way++ ) |
---|
| 871 | { |
---|
| 872 | for ( size_t set = 0 ; set < m_sets ; set++ ) |
---|
| 873 | { |
---|
[393] | 874 | addr_t addr = (((addr_t)cache_tag(way,set))*m_words*m_sets+m_words*set)*4; |
---|
| 875 | std::cout << std::dec << cache_state(way, set) |
---|
| 876 | << " | way " << way |
---|
| 877 | << " | set " << set |
---|
| 878 | << std::hex << " | @ " << addr; |
---|
| 879 | |
---|
[297] | 880 | for ( size_t word = 0 ; word < m_words ; word++ ) |
---|
| 881 | { |
---|
| 882 | std::cout << " | " << cache_data(way,set,word) ; |
---|
| 883 | } |
---|
[477] | 884 | std::cout << std::dec << std::endl ; |
---|
[297] | 885 | } |
---|
| 886 | } |
---|
| 887 | } |
---|
| 888 | |
---|
| 889 | /////////////////////////////////////////////////////////////////////////// |
---|
| 890 | // This function is deprecated as it is difficult to implement in 1 cycle. |
---|
| 891 | /////////////////////////////////////////////////////////////////////////// |
---|
| 892 | __attribute__((deprecated)) |
---|
| 893 | inline bool inval(addr_t ad) |
---|
| 894 | { |
---|
| 895 | bool hit = false; |
---|
[393] | 896 | const addr_t tag = m_z[ad]; |
---|
[297] | 897 | const size_t set = m_y[ad]; |
---|
| 898 | |
---|
| 899 | for ( size_t way = 0 ; way < m_ways && !hit ; way++ ) |
---|
| 900 | { |
---|
| 901 | if ( (tag == cache_tag(way, set)) and |
---|
[477] | 902 | (cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC) ) |
---|
[297] | 903 | { |
---|
| 904 | hit = true; |
---|
| 905 | cache_state(way, set) = CACHE_SLOT_STATE_EMPTY; |
---|
| 906 | cache_lru(way, set) = false; |
---|
| 907 | } |
---|
| 908 | } |
---|
| 909 | return hit; |
---|
| 910 | } |
---|
| 911 | |
---|
| 912 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 913 | // This function is deprecated as it is difficult to implement in 1 cycle. |
---|
| 914 | //////////////////////////////////////////////////////////////////////////////// |
---|
| 915 | __attribute__((deprecated)) |
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| 916 | inline bool inval( addr_t ad, |
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| 917 | size_t* selway, |
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| 918 | size_t* selset ) |
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| 919 | { |
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[393] | 920 | bool hit = false; |
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| 921 | const addr_t tag = m_z[ad]; |
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[297] | 922 | const size_t set = m_y[ad]; |
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| 923 | |
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| 924 | for ( size_t way = 0 ; way < m_ways && !hit ; way++ ) |
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| 925 | { |
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| 926 | if ( (tag == cache_tag(way, set)) and |
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[477] | 927 | (cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC) ) |
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[297] | 928 | { |
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| 929 | hit = true; |
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| 930 | cache_state(way, set) = CACHE_SLOT_STATE_EMPTY; |
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| 931 | cache_lru(way, set) = false; |
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| 932 | *selway = way; |
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| 933 | *selset = set; |
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| 934 | } |
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| 935 | } |
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| 936 | return hit; |
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| 937 | } |
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| 938 | |
---|
| 939 | //////////////////////////////////////////////////////////////////////////////// |
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| 940 | // This function is deprecated as the directory must be a dual port RAM... |
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| 941 | //////////////////////////////////////////////////////////////////////////////// |
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| 942 | __attribute__((deprecated)) |
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| 943 | inline bool update( addr_t ad, |
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| 944 | data_t* buf, |
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| 945 | addr_t* victim ) |
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| 946 | { |
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| 947 | size_t set, way; |
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| 948 | bool cleanup = victim_select(ad, victim, &way, &set); |
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| 949 | victim_update_tag (ad, way, set); |
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| 950 | |
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| 951 | for ( size_t word = 0 ; word < m_words ; word++ ) { |
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| 952 | cache_data(way, set, word) = buf[word] ; |
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| 953 | } |
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| 954 | |
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| 955 | return cleanup; |
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| 956 | } |
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| 957 | |
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| 958 | //////////////////////////////////////////////////////////////////////////// |
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| 959 | // this function is deprecated, as it is difficult to implement in 1 cycle. |
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| 960 | //////////////////////////////////////////////////////////////////////////// |
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| 961 | __attribute__((deprecated)) |
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| 962 | inline bool write(addr_t ad, |
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| 963 | data_t dt) |
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| 964 | { |
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[393] | 965 | const addr_t tag = m_z[ad]; |
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[297] | 966 | const size_t set = m_y[ad]; |
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| 967 | const size_t word = m_x[ad]; |
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| 968 | |
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| 969 | for ( size_t way = 0; way < m_ways; way++ ) |
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| 970 | { |
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| 971 | if ( (tag == cache_tag(way, set)) and |
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[477] | 972 | (cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC) ) |
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[297] | 973 | { |
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| 974 | cache_data(way, set, word) = dt; |
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| 975 | cache_set_lru(way, set); |
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| 976 | return true; |
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| 977 | } |
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| 978 | } |
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| 979 | return false; |
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| 980 | } |
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| 981 | |
---|
| 982 | //////////////////////////////////////////////////////////////////////////// |
---|
| 983 | // this function is deprecated, as it is difficult to implement in 1 cycle. |
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| 984 | //////////////////////////////////////////////////////////////////////////// |
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| 985 | __attribute__((deprecated)) |
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| 986 | inline bool write(addr_t ad, |
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| 987 | data_t dt, |
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| 988 | be_t be) |
---|
| 989 | { |
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[393] | 990 | const addr_t tag = m_z[ad]; |
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[297] | 991 | const size_t set = m_y[ad]; |
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| 992 | const size_t word = m_x[ad]; |
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| 993 | |
---|
| 994 | for ( size_t way = 0; way < m_ways; way++ ) |
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| 995 | { |
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| 996 | if ( (tag == cache_tag(way, set)) and |
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[477] | 997 | (cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC) ) |
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[297] | 998 | { |
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| 999 | data_t mask = be2mask(be); |
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| 1000 | data_t prev = cache_data(way, set, word); |
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| 1001 | cache_data(way, set, word) = (mask & dt) | (~mask & prev); |
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| 1002 | cache_set_lru(way, set); |
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| 1003 | return true; |
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| 1004 | } |
---|
| 1005 | } |
---|
| 1006 | return false; |
---|
| 1007 | } |
---|
| 1008 | |
---|
| 1009 | ///////////////////////////////////////////////////////////////////////////// |
---|
| 1010 | // this function is deprecated, as it is difficult to implement in 1 cycle. |
---|
| 1011 | ///////////////////////////////////////////////////////////////////////////// |
---|
| 1012 | __attribute__((deprecated)) |
---|
| 1013 | inline bool write(addr_t ad, |
---|
| 1014 | data_t dt, |
---|
| 1015 | size_t* nway) |
---|
| 1016 | { |
---|
[393] | 1017 | const addr_t tag = m_z[ad]; |
---|
[297] | 1018 | const size_t set = m_y[ad]; |
---|
| 1019 | const size_t word = m_x[ad]; |
---|
| 1020 | |
---|
| 1021 | for ( size_t way = 0; way < m_ways; way++ ) |
---|
| 1022 | { |
---|
| 1023 | if ( (tag == cache_tag(way, set)) and |
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[477] | 1024 | (cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC) ) |
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[297] | 1025 | { |
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| 1026 | cache_data(way, set, word) = dt; |
---|
| 1027 | cache_set_lru(way, set); |
---|
| 1028 | *nway = way; |
---|
| 1029 | return true; |
---|
| 1030 | } |
---|
| 1031 | } |
---|
| 1032 | return false; |
---|
| 1033 | } |
---|
| 1034 | |
---|
| 1035 | ///////////////////////////////////////////////////////////////////////////// |
---|
| 1036 | // this function is deprecated, as it is difficult to implement in 1 cycle. |
---|
| 1037 | ///////////////////////////////////////////////////////////////////////////// |
---|
| 1038 | __attribute__((deprecated)) |
---|
| 1039 | inline bool write(addr_t ad, |
---|
| 1040 | data_t dt, |
---|
| 1041 | size_t* nway, |
---|
| 1042 | be_t be) |
---|
| 1043 | { |
---|
[393] | 1044 | const addr_t tag = m_z[ad]; |
---|
[297] | 1045 | const size_t set = m_y[ad]; |
---|
| 1046 | const size_t word = m_x[ad]; |
---|
| 1047 | |
---|
| 1048 | for ( size_t way = 0; way < m_ways; way++ ) |
---|
| 1049 | { |
---|
| 1050 | if ( (tag == cache_tag(way, set)) and |
---|
[477] | 1051 | (cache_state(way, set) == CACHE_SLOT_STATE_VALID_CC) ) |
---|
[297] | 1052 | { |
---|
| 1053 | data_t mask = be2mask(be); |
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| 1054 | data_t prev = cache_data(way, set, word); |
---|
| 1055 | cache_data(way, set, word) = (mask & dt) | (~mask & prev); |
---|
| 1056 | cache_set_lru(way, set); |
---|
| 1057 | *nway = way; |
---|
| 1058 | return true; |
---|
| 1059 | } |
---|
| 1060 | } |
---|
| 1061 | return false; |
---|
| 1062 | } |
---|
| 1063 | |
---|
| 1064 | }; |
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| 1065 | |
---|
| 1066 | } // namespace soclib |
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| 1067 | |
---|
| 1068 | #endif |
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| 1069 | |
---|
| 1070 | // Local Variables: |
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| 1071 | // tab-width: 4 |
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| 1072 | // c-basic-offset: 4 |
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| 1073 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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| 1074 | // indent-tabs-mode: nil |
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| 1075 | // End: |
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| 1076 | |
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| 1077 | // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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| 1078 | |
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