[259] | 1 | /***************************************************************** |
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| 2 | * File : generic_tlb_40bits.h |
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| 3 | * Date : 02/06/2009 |
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| 4 | * Authors : Alain Greiner, Yang GAO |
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| 5 | * Copyright : UPMC/LIP6 |
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| 6 | * |
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| 7 | * This file is distributed under the LGPL licence agreement. |
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| 8 | ****************************************************************** |
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| 9 | * This object is a generic TLB (Translation Lookaside Buffer) to |
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| 10 | * translate a 40 bits physical address for Hypertransport. |
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| 11 | * It is implemented as a set-associative cache. |
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| 12 | * The replacement algorithm is pseudo-LRU. |
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| 13 | * Each TLB entry has the following format: |
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| 14 | * - bool valid (0: unmapped; 1: mapped) |
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| 15 | * - bool locally accessed |
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| 16 | * - bool remotely accessed |
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| 17 | * - bool cacheable (cached) |
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| 18 | * - bool writable (writable access bit) |
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| 19 | * - bool executable (executable access bit) |
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| 20 | * - bool user (access in user mode allowed) |
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| 21 | * - bool global (PTE not invalidated by a TLB flush) |
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| 22 | * - bool dirty (page has been modified) |
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| 23 | * Additional flag bits for every tlb entry: |
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| 24 | * - bool pagesize (0: 4K page size; 1: 2M page size) |
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| 25 | * - bool lru (recently used for replace in TLB) |
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| 26 | * - uint32_t vpn (virtual page number) |
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| 27 | * - uint32_t ppn (physical page number) |
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| 28 | * |
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| 29 | * valid, lru and global are stored in registers, others are in ram. |
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| 30 | * |
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| 31 | ***************************************************************** |
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| 32 | * This file has three constructor parameters: |
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| 33 | * - nways : number of ways per associative set. |
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| 34 | * - nsets : number of associative sets. |
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| 35 | * Both nways & nsets must be power of 2 no larger than 64. |
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| 36 | *****************************************************************/ |
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| 37 | |
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| 38 | #ifndef SOCLIB_CABA_GENERIC_TLB_H |
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| 39 | #define SOCLIB_CABA_GENERIC_TLB_H |
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| 40 | |
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| 41 | #include <inttypes.h> |
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| 42 | #include <systemc> |
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| 43 | #include <assert.h> |
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| 44 | #include "static_assert.h" |
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| 45 | #include "arithmetics.h" |
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| 46 | |
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| 47 | namespace soclib { |
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| 48 | namespace caba { |
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| 49 | |
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| 50 | using namespace sc_core; |
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| 51 | |
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| 52 | // PTE information struct |
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| 53 | typedef struct pte_info_s { |
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| 54 | bool v; // valid |
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| 55 | bool t; // type |
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| 56 | bool l; // locally accessed |
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| 57 | bool r; // remotely accessed |
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| 58 | bool c; // cacheable |
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| 59 | bool w; // writable |
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| 60 | bool x; // executable |
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| 61 | bool u; // user |
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| 62 | bool g; // global |
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| 63 | bool d; // dirty |
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| 64 | }pte_info_t; |
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| 65 | |
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| 66 | enum { |
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| 67 | PTD_ID2_MASK = 0x001FF000, |
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| 68 | PAGE_K_MASK = 0x00000FFF, |
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| 69 | PAGE_M_MASK = 0x001FFFFF, |
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| 70 | }; |
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| 71 | |
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| 72 | enum { |
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| 73 | PTE_V_MASK = 0x80000000, |
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| 74 | PTE_T_MASK = 0x40000000, |
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| 75 | PTE_L_MASK = 0x20000000, |
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| 76 | PTE_R_MASK = 0x10000000, |
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| 77 | PTE_C_MASK = 0x08000000, |
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| 78 | PTE_W_MASK = 0x04000000, |
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| 79 | PTE_X_MASK = 0x02000000, |
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| 80 | PTE_U_MASK = 0x01000000, |
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| 81 | PTE_G_MASK = 0x00800000, |
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| 82 | PTE_D_MASK = 0x00400000, |
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| 83 | }; |
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| 84 | |
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| 85 | enum { |
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| 86 | PTE_V_SHIFT = 31, |
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| 87 | PTE_T_SHIFT = 30, |
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| 88 | PTE_L_SHIFT = 29, |
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| 89 | PTE_R_SHIFT = 28, |
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| 90 | PTE_C_SHIFT = 27, |
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| 91 | PTE_W_SHIFT = 26, |
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| 92 | PTE_X_SHIFT = 25, |
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| 93 | PTE_U_SHIFT = 24, |
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| 94 | PTE_G_SHIFT = 23, |
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| 95 | PTE_D_SHIFT = 22, |
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| 96 | }; |
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| 97 | |
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| 98 | enum { |
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| 99 | PAGE_M_NBITS = 21, |
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| 100 | PAGE_K_NBITS = 12, |
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| 101 | INDEX1_NBITS = 11, |
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| 102 | }; |
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| 103 | |
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| 104 | using soclib::common::uint32_log2; |
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| 105 | |
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| 106 | // registers describing a TLB entry state |
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| 107 | typedef struct tlb_entry_state { |
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| 108 | sc_signal<bool> v; //valid |
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| 109 | sc_signal<bool> g; //global |
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| 110 | sc_signal<bool> l; //LRU |
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| 111 | } tlb_entry_state_t; |
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| 112 | |
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| 113 | // registers describing a tlb set state |
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| 114 | typedef class tlb_set_state { |
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| 115 | private: |
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| 116 | tlb_entry_state_t *entries; |
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| 117 | size_t nways; |
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| 118 | public: |
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| 119 | tlb_set_state() |
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| 120 | { |
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| 121 | } |
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| 122 | |
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| 123 | ~tlb_set_state() |
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| 124 | { |
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| 125 | delete [] entries; |
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| 126 | } |
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| 127 | |
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| 128 | void |
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| 129 | init(size_t m_nways) |
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| 130 | { |
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| 131 | nways = m_nways; |
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| 132 | entries = new tlb_entry_state_t[nways]; |
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| 133 | } |
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| 134 | |
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| 135 | bool get_valid(size_t way) |
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| 136 | { |
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| 137 | return entries[way].v; |
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| 138 | } |
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| 139 | void set_valid(size_t way) |
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| 140 | { |
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| 141 | assert(entries[way].l == false && |
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| 142 | "invalid entry should not have LRU"); |
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| 143 | entries[way].v = true; |
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| 144 | } |
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| 145 | void clear_valid(size_t way) |
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| 146 | { |
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| 147 | entries[way].v = false; |
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| 148 | entries[way].l = false; |
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| 149 | } |
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| 150 | |
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| 151 | bool get_global(size_t way) |
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| 152 | { |
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| 153 | return entries[way].g; |
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| 154 | } |
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| 155 | void set_global(size_t way) |
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| 156 | { |
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| 157 | entries[way].g = true; |
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| 158 | } |
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| 159 | void clear_global(size_t way) |
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| 160 | { |
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| 161 | entries[way].g = false; |
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| 162 | } |
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| 163 | |
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| 164 | bool get_lru(size_t way) |
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| 165 | { |
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| 166 | return entries[way].l; |
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| 167 | } |
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| 168 | void set_lru(size_t way) |
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| 169 | { |
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| 170 | entries[way].l = true; |
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| 171 | /* |
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| 172 | * if all LRU bits for the set are true, clear them |
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| 173 | */ |
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| 174 | for (size_t i = 0; i < nways; i++) |
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| 175 | { |
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| 176 | if (i == way) |
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| 177 | continue; |
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| 178 | if (entries[i].l == false) |
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| 179 | return; |
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| 180 | } |
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| 181 | // all LRU bits are set |
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| 182 | for (size_t i = 0; i < nways; i++) |
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| 183 | { |
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| 184 | entries[i].l = false; |
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| 185 | } |
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| 186 | } |
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| 187 | void clear_lru(size_t way) |
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| 188 | { |
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| 189 | entries[way].l = false; |
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| 190 | } |
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| 191 | |
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| 192 | void reset() |
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| 193 | { |
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| 194 | for (size_t i = 0; i < nways; i++) |
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| 195 | { |
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| 196 | entries[i].l = false; |
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| 197 | entries[i].g = false; |
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| 198 | entries[i].v = false; |
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| 199 | } |
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| 200 | } |
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| 201 | } tlb_set_state_t; |
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| 202 | |
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| 203 | template<typename paddr_t> |
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| 204 | class GenericTlb |
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| 205 | { |
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| 206 | protected: |
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| 207 | typedef uint32_t vaddr_t; |
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| 208 | typedef uint32_t data_t; |
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| 209 | |
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| 210 | const size_t m_nways; |
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| 211 | const size_t m_nsets; |
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| 212 | const size_t m_paddr_nbits; |
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| 213 | const size_t m_sets_shift; |
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| 214 | const size_t m_sets_mask; |
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| 215 | |
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| 216 | data_t *m_ppn; |
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| 217 | data_t *m_vpn; |
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| 218 | bool *m_pagesize; |
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| 219 | bool *m_locacc; |
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| 220 | bool *m_remacc; |
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| 221 | bool *m_cacheable; |
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| 222 | bool *m_writable; |
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| 223 | bool *m_executable; |
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| 224 | bool *m_user; |
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| 225 | bool *m_dirty; |
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| 226 | |
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| 227 | tlb_set_state_t *m_setsstate; |
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| 228 | |
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| 229 | public: |
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| 230 | // access methods |
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| 231 | void setlru(size_t way, size_t set) |
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| 232 | { |
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| 233 | m_setsstate[set].set_lru(way); |
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| 234 | } |
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| 235 | |
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| 236 | void clearlru(size_t way, size_t set) |
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| 237 | { |
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| 238 | m_setsstate[set].clear_lru(way); |
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| 239 | } |
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| 240 | |
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| 241 | bool lru(size_t way, size_t set) |
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| 242 | { |
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| 243 | return m_setsstate[set].get_lru(way); |
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| 244 | } |
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| 245 | |
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| 246 | void setvalid(size_t way, size_t set) |
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| 247 | { |
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| 248 | m_setsstate[set].set_valid(way); |
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| 249 | } |
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| 250 | |
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| 251 | void clearvalid(size_t way, size_t set) |
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| 252 | { |
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| 253 | m_setsstate[set].clear_valid(way); |
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| 254 | } |
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| 255 | |
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| 256 | bool valid(size_t way, size_t set) |
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| 257 | { |
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| 258 | return m_setsstate[set].get_valid(way); |
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| 259 | } |
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| 260 | |
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| 261 | void setglobal(size_t way, size_t set) |
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| 262 | { |
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| 263 | m_setsstate[set].set_global(way); |
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| 264 | } |
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| 265 | |
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| 266 | void clearglobal(size_t way, size_t set) |
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| 267 | { |
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| 268 | m_setsstate[set].clear_global(way); |
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| 269 | } |
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| 270 | |
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| 271 | bool global(size_t way, size_t set) |
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| 272 | { |
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| 273 | return m_setsstate[set].get_global(way); |
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| 274 | } |
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| 275 | |
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| 276 | data_t &ppn(size_t way, size_t set) |
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| 277 | { |
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| 278 | return m_ppn[(way*m_nsets)+set]; |
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| 279 | } |
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| 280 | |
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| 281 | data_t &vpn(size_t way, size_t set) |
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| 282 | { |
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| 283 | return m_vpn[(way*m_nsets)+set]; |
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| 284 | } |
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| 285 | |
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| 286 | bool &pagesize(size_t way, size_t set) |
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| 287 | { |
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| 288 | return m_pagesize[(way*m_nsets)+set]; |
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| 289 | } |
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| 290 | |
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| 291 | bool &locacc(size_t way, size_t set) |
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| 292 | { |
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| 293 | return m_locacc[(way*m_nsets)+set]; |
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| 294 | } |
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| 295 | |
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| 296 | bool &remacc(size_t way, size_t set) |
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| 297 | { |
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| 298 | return m_remacc[(way*m_nsets)+set]; |
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| 299 | } |
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| 300 | |
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| 301 | bool &cacheable(size_t way, size_t set) |
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| 302 | { |
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| 303 | return m_cacheable[(way*m_nsets)+set]; |
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| 304 | } |
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| 305 | |
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| 306 | bool &writable(size_t way, size_t set) |
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| 307 | { |
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| 308 | return m_writable[(way*m_nsets)+set]; |
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| 309 | } |
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| 310 | |
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| 311 | bool &executable(size_t way, size_t set) |
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| 312 | { |
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| 313 | return m_executable[(way*m_nsets)+set]; |
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| 314 | } |
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| 315 | |
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| 316 | bool &user(size_t way, size_t set) |
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| 317 | { |
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| 318 | return m_user[(way*m_nsets)+set]; |
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| 319 | } |
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| 320 | |
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| 321 | bool &dirty(size_t way, size_t set) |
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| 322 | { |
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| 323 | return m_dirty[(way*m_nsets)+set]; |
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| 324 | } |
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| 325 | |
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| 326 | ////////////////////////////////////////////////////////////// |
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| 327 | // constructor checks parameters, allocates the memory |
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| 328 | // and computes m_page_mask, m_sets_mask and m_sets_shift |
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| 329 | ////////////////////////////////////////////////////////////// |
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| 330 | GenericTlb(size_t nways, size_t nsets, size_t paddr_nbits): |
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| 331 | m_nways(nways), |
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| 332 | m_nsets(nsets), |
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| 333 | m_paddr_nbits(paddr_nbits), |
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| 334 | m_sets_shift(uint32_log2(nsets)), |
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| 335 | m_sets_mask((1<<(int)uint32_log2(nsets))-1) |
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| 336 | { |
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| 337 | assert(IS_POW_OF_2(nsets)); |
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| 338 | assert(IS_POW_OF_2(nways)); |
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| 339 | assert(nsets <= 64); |
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| 340 | assert(nways <= 64); |
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| 341 | |
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| 342 | if((m_paddr_nbits < 32) || (m_paddr_nbits > 42)) |
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| 343 | { |
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| 344 | printf("Error in the genericTlb component\n"); |
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| 345 | printf("The physical address parameter must be in the range [32,42]\n"); |
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| 346 | exit(1); |
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| 347 | } |
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| 348 | |
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| 349 | m_ppn = new data_t[nways * nsets]; |
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| 350 | m_vpn = new data_t[nways * nsets]; |
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| 351 | m_pagesize = new bool[nways * nsets]; |
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| 352 | m_locacc = new bool[nways * nsets]; |
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| 353 | m_remacc = new bool[nways * nsets]; |
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| 354 | m_cacheable = new bool[nways * nsets]; |
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| 355 | m_writable = new bool[nways * nsets]; |
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| 356 | m_executable = new bool[nways * nsets]; |
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| 357 | m_user = new bool[nways * nsets]; |
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| 358 | m_dirty = new bool[nways * nsets]; |
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| 359 | m_setsstate = new tlb_set_state_t[nsets]; |
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| 360 | for (size_t i = 0; i < nsets; i++) |
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| 361 | m_setsstate[i].init(nways); |
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| 362 | |
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| 363 | } // end constructor |
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| 364 | |
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| 365 | ~GenericTlb() |
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| 366 | { |
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| 367 | delete [] m_ppn; |
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| 368 | delete [] m_vpn; |
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| 369 | delete [] m_pagesize; |
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| 370 | delete [] m_locacc; |
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| 371 | delete [] m_remacc; |
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| 372 | delete [] m_cacheable; |
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| 373 | delete [] m_writable; |
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| 374 | delete [] m_executable; |
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| 375 | delete [] m_user; |
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| 376 | delete [] m_dirty; |
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| 377 | delete [] m_setsstate; |
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| 378 | } |
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| 379 | |
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| 380 | ///////////////////////////////////////////////////////////// |
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| 381 | // This method resets all the TLB entry. |
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| 382 | ///////////////////////////////////////////////////////////// |
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| 383 | void reset() |
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| 384 | { |
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| 385 | for (size_t i = 0; i < m_nsets; i++) |
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| 386 | m_setsstate[i].reset(); |
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| 387 | } |
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| 388 | |
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| 389 | ///////////////////////////////////////////////////////// |
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| 390 | // This method returns "false" in case of MISS |
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| 391 | // In case of HIT, the physical address, |
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| 392 | // the pte informations, way and set are returned. |
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| 393 | ///////////////////////////////////////////////////////// |
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| 394 | bool translate( vaddr_t vaddress, // virtual address |
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| 395 | paddr_t *paddress, // return physique address |
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| 396 | pte_info_t *pte_info, // return pte information |
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| 397 | size_t *tw, // return way |
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| 398 | size_t *ts ) // return set |
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| 399 | { |
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| 400 | size_t m_set = (vaddress >> PAGE_M_NBITS) & m_sets_mask; |
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| 401 | size_t k_set = (vaddress >> PAGE_K_NBITS) & m_sets_mask; |
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| 402 | |
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| 403 | for( size_t way = 0; way < m_nways; way++ ) |
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| 404 | { |
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| 405 | // TLB hit test for 2M page size |
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| 406 | if( valid(way,m_set) && pagesize(way,m_set) && |
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| 407 | (vpn(way,m_set) == (vaddress >> (PAGE_M_NBITS + m_sets_shift))) ) |
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| 408 | { |
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| 409 | pte_info->l = locacc(way,m_set); |
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| 410 | pte_info->r = remacc(way,m_set); |
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| 411 | pte_info->c = cacheable(way,m_set); |
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| 412 | pte_info->w = writable(way,m_set); |
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| 413 | pte_info->x = executable(way,m_set); |
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| 414 | pte_info->u = user(way,m_set); |
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| 415 | pte_info->g = global(way,m_set); |
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| 416 | pte_info->d = dirty(way,m_set); |
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| 417 | *tw = way; |
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| 418 | *ts = m_set; |
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| 419 | *paddress = (paddr_t)((paddr_t)ppn(way,m_set) << PAGE_M_NBITS) | (paddr_t)(vaddress & PAGE_M_MASK); |
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| 420 | setlru(way, m_set); |
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| 421 | return true; |
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| 422 | } |
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| 423 | |
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| 424 | // TLB hit test for 4K page size |
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| 425 | if( valid(way,k_set) && !pagesize(way,k_set) && |
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| 426 | (vpn(way,k_set) == (vaddress >> (PAGE_K_NBITS + m_sets_shift))) ) |
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| 427 | { |
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| 428 | pte_info->l = locacc(way,k_set); |
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| 429 | pte_info->r = remacc(way,k_set); |
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| 430 | pte_info->c = cacheable(way,k_set); |
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| 431 | pte_info->w = writable(way,k_set); |
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| 432 | pte_info->x = executable(way,k_set); |
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| 433 | pte_info->u = user(way,k_set); |
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| 434 | pte_info->g = global(way,k_set); |
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| 435 | pte_info->d = dirty(way,k_set); |
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| 436 | *tw = way; |
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| 437 | *ts = k_set; |
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| 438 | *paddress = (paddr_t)((paddr_t)ppn(way,k_set) << PAGE_K_NBITS) | (paddr_t)(vaddress & PAGE_K_MASK); |
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| 439 | setlru(way, k_set); |
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| 440 | return true; |
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| 441 | } |
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| 442 | } |
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| 443 | return false; |
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| 444 | } // end translate() |
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| 445 | |
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| 446 | ///////////////////////////////////////////////////////// |
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| 447 | // This method returns "false" in case of MISS |
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| 448 | // In case of HIT, the physical page number is returned. |
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| 449 | ///////////////////////////////////////////////////////// |
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| 450 | bool translate(vaddr_t vaddress, paddr_t *paddress) |
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| 451 | { |
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| 452 | size_t m_set = (vaddress >> PAGE_M_NBITS) & m_sets_mask; |
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| 453 | size_t k_set = (vaddress >> PAGE_K_NBITS) & m_sets_mask; |
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| 454 | for( size_t way = 0; way < m_nways; way++ ) |
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| 455 | { |
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| 456 | // TLB hit test for 2M page size |
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| 457 | if( valid(way,m_set) && pagesize(way,m_set) && |
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| 458 | (vpn(way,m_set) == (vaddress >> (PAGE_M_NBITS + m_sets_shift))) ) |
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| 459 | { |
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| 460 | *paddress = (paddr_t)((paddr_t)ppn(way,m_set) << PAGE_M_NBITS) | (paddr_t)(vaddress & PAGE_M_MASK); |
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| 461 | setlru(way, m_set); |
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| 462 | return true; |
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| 463 | } |
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| 464 | |
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| 465 | // TLB hit test for 4K page size |
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| 466 | if( valid(way,k_set) && !pagesize(way,k_set) && |
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| 467 | (vpn(way,k_set) == (vaddress >> (PAGE_K_NBITS + m_sets_shift))) ) |
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| 468 | { |
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| 469 | *paddress = (paddr_t)((paddr_t)ppn(way,k_set) << PAGE_K_NBITS) | (paddr_t)(vaddress & PAGE_K_MASK); |
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| 470 | setlru(way, k_set); |
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| 471 | return true; |
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| 472 | } |
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| 473 | } |
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| 474 | return false; |
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| 475 | } // end translate() |
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| 476 | ///////////////////////////////////////////////////////////// |
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| 477 | // This method resets all VALID bits in one cycle, |
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| 478 | // when the the argument is true. |
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| 479 | // Locked descriptors are preserved when it is false. |
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| 480 | ///////////////////////////////////////////////////////////// |
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| 481 | void flush(bool all) |
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| 482 | { |
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| 483 | for( size_t way = 0; way < m_nways; way++ ) |
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| 484 | { |
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| 485 | for(size_t set = 0; set < m_nsets; set++) |
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| 486 | { |
---|
| 487 | if (!valid (way,set)) |
---|
| 488 | continue; |
---|
| 489 | if(global(way,set)) |
---|
| 490 | { |
---|
| 491 | if(all) |
---|
| 492 | { |
---|
| 493 | clearvalid(way,set); // forced reset, the locked page invalid too |
---|
| 494 | } |
---|
| 495 | } |
---|
| 496 | else |
---|
| 497 | { |
---|
| 498 | clearvalid(way,set); // not forced reset, the locked page conserve |
---|
| 499 | } |
---|
| 500 | } |
---|
| 501 | } |
---|
| 502 | } // end flush |
---|
| 503 | |
---|
| 504 | uint32_t getpte(size_t way,size_t set) |
---|
| 505 | { |
---|
| 506 | data_t pte = 0; |
---|
| 507 | if ( pagesize(way,set) ) // 2M page size |
---|
| 508 | { |
---|
| 509 | pte = (data_t)ppn(way,set) | (PTE_V_MASK & (valid(way,set) << PTE_V_SHIFT)); |
---|
| 510 | |
---|
| 511 | if ( locacc(way,set) ) |
---|
| 512 | pte = pte | PTE_L_MASK; |
---|
| 513 | if ( remacc(way,set) ) |
---|
| 514 | pte = pte | PTE_R_MASK; |
---|
| 515 | if ( cacheable(way,set) ) |
---|
| 516 | pte = pte | PTE_C_MASK; |
---|
| 517 | if ( writable(way,set) ) |
---|
| 518 | pte = pte | PTE_W_MASK; |
---|
| 519 | if ( executable(way,set) ) |
---|
| 520 | pte = pte | PTE_X_MASK; |
---|
| 521 | if ( user(way,set) ) |
---|
| 522 | pte = pte | PTE_U_MASK; |
---|
| 523 | if ( global(way,set) ) |
---|
| 524 | pte = pte | PTE_G_MASK; |
---|
| 525 | if ( dirty(way,set) ) |
---|
| 526 | pte = pte | PTE_D_MASK; |
---|
| 527 | } |
---|
| 528 | else // 4K page size |
---|
| 529 | { |
---|
| 530 | pte = (data_t)(PTE_V_MASK & (valid(way,set) << PTE_V_SHIFT)); |
---|
| 531 | |
---|
| 532 | if ( locacc(way,set) ) |
---|
| 533 | pte = pte | PTE_L_MASK; |
---|
| 534 | if ( remacc(way,set) ) |
---|
| 535 | pte = pte | PTE_R_MASK; |
---|
| 536 | if ( cacheable(way,set) ) |
---|
| 537 | pte = pte | PTE_C_MASK; |
---|
| 538 | if ( writable(way,set) ) |
---|
| 539 | pte = pte | PTE_W_MASK; |
---|
| 540 | if ( executable(way,set) ) |
---|
| 541 | pte = pte | PTE_X_MASK; |
---|
| 542 | if ( user(way,set) ) |
---|
| 543 | pte = pte | PTE_U_MASK; |
---|
| 544 | if ( global(way,set) ) |
---|
| 545 | pte = pte | PTE_G_MASK; |
---|
| 546 | if ( dirty(way,set) ) |
---|
| 547 | pte = pte | PTE_D_MASK; |
---|
| 548 | } |
---|
| 549 | return pte; |
---|
| 550 | } // end getpte() |
---|
| 551 | |
---|
| 552 | ///////////////////////////////////////////////////////////// |
---|
| 553 | // This method return the index of the least recently |
---|
| 554 | // used descriptor in the associative set. |
---|
| 555 | ///////////////////////////////////////////////////////////// |
---|
| 556 | size_t getlru(size_t set) |
---|
| 557 | { |
---|
| 558 | // check val bit firstly, replace the invalid PTE |
---|
| 559 | for(size_t way = 0; way < m_nways; way++) |
---|
| 560 | { |
---|
| 561 | if( !valid(way,set) ) |
---|
| 562 | { |
---|
| 563 | return way; |
---|
| 564 | } |
---|
| 565 | } |
---|
| 566 | |
---|
| 567 | // then we check bit lock, remplace and old way which is not global |
---|
| 568 | for( size_t way = 0; way < m_nways; way++ ) |
---|
| 569 | { |
---|
| 570 | if( !global(way,set) && !lru(way,set) ) |
---|
| 571 | { |
---|
| 572 | return way; |
---|
| 573 | } |
---|
| 574 | } |
---|
| 575 | |
---|
| 576 | // finally remplace the first old way |
---|
| 577 | for( size_t way = 0; way < m_nways; way++ ) |
---|
| 578 | { |
---|
| 579 | if( !lru(way,set) ) |
---|
| 580 | { |
---|
| 581 | return way; |
---|
| 582 | } |
---|
| 583 | } |
---|
| 584 | |
---|
| 585 | assert(0 && "all TLB ways can't be new at the same time"); |
---|
| 586 | return 0; /* avoid gcc warning */ |
---|
| 587 | } // end getlru() |
---|
| 588 | |
---|
| 589 | ///////////////////////////////////////////////////////////// |
---|
| 590 | // This method writes a new 2M page size entry in the TLB. |
---|
| 591 | ///////////////////////////////////////////////////////////// |
---|
| 592 | void update(data_t pte, vaddr_t vaddress) |
---|
| 593 | { |
---|
| 594 | size_t set = (vaddress >> PAGE_M_NBITS) & m_sets_mask; |
---|
| 595 | size_t way = getlru(set); |
---|
| 596 | |
---|
| 597 | vpn(way,set) = vaddress >> (PAGE_M_NBITS + m_sets_shift); |
---|
| 598 | ppn(way,set) = pte & ((1<<(m_paddr_nbits - PAGE_M_NBITS))-1); |
---|
| 599 | |
---|
| 600 | setvalid(way,set); |
---|
| 601 | pagesize(way,set) = true; |
---|
| 602 | setlru(way,set); |
---|
| 603 | locacc(way,set) = (((pte & PTE_L_MASK) >> PTE_L_SHIFT) == 1) ? true : false; |
---|
| 604 | remacc(way,set) = (((pte & PTE_R_MASK) >> PTE_R_SHIFT) == 1) ? true : false; |
---|
| 605 | cacheable(way,set) = (((pte & PTE_C_MASK) >> PTE_C_SHIFT) == 1) ? true : false; |
---|
| 606 | writable(way,set) = (((pte & PTE_W_MASK) >> PTE_W_SHIFT) == 1) ? true : false; |
---|
| 607 | executable(way,set) = (((pte & PTE_X_MASK) >> PTE_X_SHIFT) == 1) ? true : false; |
---|
| 608 | user(way,set) = (((pte & PTE_U_MASK) >> PTE_U_SHIFT) == 1) ? true : false; |
---|
| 609 | if (((pte & PTE_G_MASK) >> PTE_G_SHIFT) == 1) |
---|
| 610 | setglobal(way,set); |
---|
| 611 | else |
---|
| 612 | clearglobal(way,set); |
---|
| 613 | |
---|
| 614 | dirty(way,set) = (((pte & PTE_D_MASK) >> PTE_D_SHIFT) == 1) ? true : false; |
---|
| 615 | } // end update() |
---|
| 616 | |
---|
| 617 | ///////////////////////////////////////////////////////////// |
---|
| 618 | // This method writes a new 4K page size entry in the TLB. |
---|
| 619 | ///////////////////////////////////////////////////////////// |
---|
| 620 | void update(data_t pte, data_t ppn2 , vaddr_t vaddress) |
---|
| 621 | { |
---|
| 622 | size_t set = (vaddress >> PAGE_K_NBITS) & m_sets_mask; |
---|
| 623 | size_t way = getlru(set); |
---|
| 624 | |
---|
| 625 | vpn(way,set) = vaddress >> (PAGE_K_NBITS + m_sets_shift); |
---|
| 626 | ppn(way,set) = ppn2 & ((1<<(m_paddr_nbits - PAGE_K_NBITS))-1); |
---|
| 627 | |
---|
| 628 | setvalid(way,set); |
---|
| 629 | pagesize(way,set) = false; |
---|
| 630 | setlru(way,set); |
---|
| 631 | locacc(way,set) = (((pte & PTE_L_MASK) >> PTE_L_SHIFT) == 1) ? true : false; |
---|
| 632 | remacc(way,set) = (((pte & PTE_R_MASK) >> PTE_R_SHIFT) == 1) ? true : false; |
---|
| 633 | cacheable(way,set) = (((pte & PTE_C_MASK) >> PTE_C_SHIFT) == 1) ? true : false; |
---|
| 634 | writable(way,set) = (((pte & PTE_W_MASK) >> PTE_W_SHIFT) == 1) ? true : false; |
---|
| 635 | executable(way,set) = (((pte & PTE_X_MASK) >> PTE_X_SHIFT) == 1) ? true : false; |
---|
| 636 | user(way,set) = (((pte & PTE_U_MASK) >> PTE_U_SHIFT) == 1) ? true : false; |
---|
| 637 | if (((pte & PTE_G_MASK) >> PTE_G_SHIFT) == 1) |
---|
| 638 | setglobal(way,set); |
---|
| 639 | else |
---|
| 640 | clearglobal(way,set); |
---|
| 641 | dirty(way,set) = (((pte & PTE_D_MASK) >> PTE_D_SHIFT) == 1) ? true : false; |
---|
| 642 | } // end update() |
---|
| 643 | |
---|
| 644 | ////////////////////////////////////////////////////////////// |
---|
| 645 | // This method invalidates a TLB entry |
---|
| 646 | // identified by the virtual page number. |
---|
| 647 | ////////////////////////////////////////////////////////////// |
---|
| 648 | bool inval(vaddr_t vaddress) |
---|
| 649 | { |
---|
| 650 | size_t m_set = (vaddress >> PAGE_M_NBITS) & m_sets_mask; |
---|
| 651 | size_t k_set = (vaddress >> PAGE_K_NBITS) & m_sets_mask; |
---|
| 652 | for( size_t way = 0; way < m_nways; way++ ) |
---|
| 653 | { |
---|
| 654 | // TLB hit test for 2M page size |
---|
| 655 | if( valid(way,m_set) && pagesize(way,m_set) && |
---|
| 656 | (vpn(way,m_set) == (vaddress >> (PAGE_M_NBITS + m_sets_shift))) ) |
---|
| 657 | { |
---|
| 658 | clearvalid(way,m_set); |
---|
| 659 | return true; |
---|
| 660 | } |
---|
| 661 | |
---|
| 662 | // TLB hit test for 4K page size |
---|
| 663 | if( valid(way,k_set) && !pagesize(way,k_set) && |
---|
| 664 | (vpn(way,k_set) == (vaddress >> (PAGE_K_NBITS + m_sets_shift))) ) |
---|
| 665 | { |
---|
| 666 | clearvalid(way,k_set); |
---|
| 667 | return true; |
---|
| 668 | } |
---|
| 669 | } |
---|
| 670 | return false; |
---|
| 671 | } // end translate() |
---|
| 672 | |
---|
| 673 | ///////////////////////////////////////////////////////////// |
---|
| 674 | // This method writes a new entry in the TLB. |
---|
| 675 | ///////////////////////////////////////////////////////////// |
---|
| 676 | void setdirty(size_t way, size_t set) |
---|
| 677 | { |
---|
| 678 | dirty(way,set) = true; |
---|
| 679 | } // end setdirty() |
---|
| 680 | |
---|
| 681 | ///////////////////////////////////////////////////////////// |
---|
| 682 | // This method return the page size. |
---|
| 683 | ///////////////////////////////////////////////////////////// |
---|
| 684 | bool getpagesize(size_t way, size_t set) |
---|
| 685 | { |
---|
| 686 | return pagesize(way,set); |
---|
| 687 | } |
---|
| 688 | |
---|
| 689 | }; // GenericTlb |
---|
| 690 | |
---|
| 691 | template<typename paddr_t> |
---|
| 692 | class GenericCcTlb : public GenericTlb<paddr_t> |
---|
| 693 | { |
---|
| 694 | public: |
---|
| 695 | typedef uint32_t vaddr_t; |
---|
| 696 | typedef uint32_t data_t; |
---|
| 697 | |
---|
| 698 | paddr_t *m_nline; |
---|
| 699 | |
---|
| 700 | // access methods |
---|
| 701 | paddr_t &nline(size_t way, size_t set) |
---|
| 702 | { |
---|
| 703 | return m_nline[(way*this->m_nsets)+set]; |
---|
| 704 | } |
---|
| 705 | |
---|
| 706 | public: |
---|
| 707 | ////////////////////////////////////////////////////////////// |
---|
| 708 | // constructor checks parameters, allocates the memory |
---|
| 709 | // and computes m_page_mask, m_sets_mask and m_sets_shift |
---|
| 710 | ////////////////////////////////////////////////////////////// |
---|
| 711 | GenericCcTlb(size_t nways, size_t nsets, size_t paddr_nbits):GenericTlb<paddr_t>::GenericTlb(nways, nsets, paddr_nbits) |
---|
| 712 | { |
---|
| 713 | m_nline = new paddr_t[this->m_nways * this->m_nsets]; |
---|
| 714 | } // end constructor |
---|
| 715 | |
---|
| 716 | ~GenericCcTlb() |
---|
| 717 | { |
---|
| 718 | delete [] m_nline; |
---|
| 719 | } |
---|
| 720 | |
---|
| 721 | ///////////////////////////////////////////////////////// |
---|
| 722 | // This method returns "false" in case of MISS |
---|
| 723 | // In case of HIT, the physical address, |
---|
| 724 | // the pte informations, way and set are returned. |
---|
| 725 | ///////////////////////////////////////////////////////// |
---|
| 726 | bool cctranslate( vaddr_t vaddress, // virtual address |
---|
| 727 | paddr_t *paddress, // return physique address |
---|
| 728 | pte_info_t *pte_info, // return pte information |
---|
| 729 | paddr_t *victim_index, // return nline |
---|
| 730 | size_t *tw, // return way |
---|
| 731 | size_t *ts ) // return set |
---|
| 732 | { |
---|
| 733 | size_t m_set = (vaddress >> PAGE_M_NBITS) & this->m_sets_mask; |
---|
| 734 | size_t k_set = (vaddress >> PAGE_K_NBITS) & this->m_sets_mask; |
---|
| 735 | |
---|
| 736 | for( size_t way = 0; way < this->m_nways; way++ ) |
---|
| 737 | { |
---|
| 738 | // TLB hit test for 2M page size |
---|
| 739 | if( this->valid(way,m_set) && this->pagesize(way,m_set) && |
---|
| 740 | (this->vpn(way,m_set) == (vaddress >> (PAGE_M_NBITS + this->m_sets_shift))) ) |
---|
| 741 | { |
---|
| 742 | pte_info->l = this->locacc(way,m_set); |
---|
| 743 | pte_info->r = this->remacc(way,m_set); |
---|
| 744 | pte_info->c = this->cacheable(way,m_set); |
---|
| 745 | pte_info->w = this->writable(way,m_set); |
---|
| 746 | pte_info->x = this->executable(way,m_set); |
---|
| 747 | pte_info->u = this->user(way,m_set); |
---|
| 748 | pte_info->g = this->global(way,m_set); |
---|
| 749 | pte_info->d = this->dirty(way,m_set); |
---|
| 750 | *victim_index = nline(way,m_set); |
---|
| 751 | *tw = way; |
---|
| 752 | *ts = m_set; |
---|
| 753 | *paddress = (paddr_t)((paddr_t)this->ppn(way,m_set) << PAGE_M_NBITS) | (paddr_t)(vaddress & PAGE_M_MASK); |
---|
| 754 | //this->setlru(way, m_set); |
---|
| 755 | return true; |
---|
| 756 | } |
---|
| 757 | |
---|
| 758 | // TLB hit test for 4K page size |
---|
| 759 | if( this->valid(way,k_set) && !(this->pagesize(way,k_set)) && |
---|
| 760 | (this->vpn(way,k_set) == (vaddress >> (PAGE_K_NBITS + this->m_sets_shift))) ) |
---|
| 761 | { |
---|
| 762 | pte_info->l = this->locacc(way,k_set); |
---|
| 763 | pte_info->r = this->remacc(way,k_set); |
---|
| 764 | pte_info->c = this->cacheable(way,k_set); |
---|
| 765 | pte_info->w = this->writable(way,k_set); |
---|
| 766 | pte_info->x = this->executable(way,k_set); |
---|
| 767 | pte_info->u = this->user(way,k_set); |
---|
| 768 | pte_info->g = this->global(way,k_set); |
---|
| 769 | pte_info->d = this->dirty(way,k_set); |
---|
| 770 | *victim_index = nline(way,k_set); |
---|
| 771 | *tw = way; |
---|
| 772 | *ts = k_set; |
---|
| 773 | *paddress = (paddr_t)((paddr_t)this->ppn(way,k_set) << PAGE_K_NBITS) | (paddr_t)(vaddress & PAGE_K_MASK); |
---|
| 774 | //this->setlru(way, k_set); |
---|
| 775 | return true; |
---|
| 776 | } |
---|
| 777 | } |
---|
| 778 | return false; |
---|
| 779 | } // end translate() |
---|
| 780 | |
---|
| 781 | ////////////////////////////////////////////////////////////// |
---|
| 782 | // This method invalidates a TLB entry for cc_vcache2 |
---|
| 783 | // identified by the virtual page number. |
---|
| 784 | ////////////////////////////////////////////////////////////// |
---|
| 785 | bool inval(vaddr_t vaddress, paddr_t* victim) |
---|
| 786 | { |
---|
| 787 | paddr_t vic_nline = 0; |
---|
| 788 | size_t m_set = (vaddress >> PAGE_M_NBITS) & this->m_sets_mask; |
---|
| 789 | size_t k_set = (vaddress >> PAGE_K_NBITS) & this->m_sets_mask; |
---|
| 790 | |
---|
| 791 | for( size_t way = 0; way < this->m_nways; way++ ) |
---|
| 792 | { |
---|
| 793 | if( this->valid(way,m_set) && this->pagesize(way,m_set) && |
---|
| 794 | (this->vpn(way,m_set) == (vaddress >> (PAGE_M_NBITS + this->m_sets_shift))) ) |
---|
| 795 | { |
---|
| 796 | vic_nline = nline(way,m_set); |
---|
| 797 | this->clearvalid(way,m_set); |
---|
| 798 | break; |
---|
| 799 | } |
---|
| 800 | |
---|
| 801 | if( this->valid(way,k_set) && !(this->pagesize(way,k_set)) && |
---|
| 802 | (this->vpn(way,k_set) == (vaddress >> (PAGE_K_NBITS + this->m_sets_shift))) ) |
---|
| 803 | { |
---|
| 804 | vic_nline = nline(way,k_set); |
---|
| 805 | this->clearvalid(way,k_set); |
---|
| 806 | break; |
---|
| 807 | } |
---|
| 808 | if ( way == (this->m_nways-1)) return false; |
---|
| 809 | } |
---|
| 810 | |
---|
| 811 | *victim = vic_nline; |
---|
| 812 | // verify whether need a cleanup |
---|
| 813 | for( size_t way = 0; way < this->m_nways; way++ ) |
---|
| 814 | { |
---|
| 815 | for( size_t set = 0; set < this->m_nsets; set++ ) |
---|
| 816 | { |
---|
| 817 | if( (nline(way,set) == vic_nline) && (this->valid(way,set)) ) |
---|
| 818 | { |
---|
| 819 | return false; |
---|
| 820 | } |
---|
| 821 | } |
---|
| 822 | } |
---|
| 823 | return true; |
---|
| 824 | } // end inval() |
---|
| 825 | |
---|
| 826 | ////////////////////////////////////////////////////////////// |
---|
| 827 | // This method invalidates a TLB entry for cc_vcache |
---|
| 828 | // identified by the virtual page number. |
---|
| 829 | ////////////////////////////////////////////////////////////// |
---|
| 830 | bool inval1(vaddr_t vaddress, paddr_t* victim) |
---|
| 831 | { |
---|
| 832 | paddr_t vic_nline = 0; |
---|
| 833 | size_t m_set = (vaddress >> PAGE_M_NBITS) & this->m_sets_mask; |
---|
| 834 | size_t k_set = (vaddress >> PAGE_K_NBITS) & this->m_sets_mask; |
---|
| 835 | |
---|
| 836 | for( size_t way = 0; way < this->m_nways; way++ ) |
---|
| 837 | { |
---|
| 838 | if( this->valid(way,m_set) && this->pagesize(way,m_set) && |
---|
| 839 | (this->vpn(way,m_set) == (vaddress >> (PAGE_M_NBITS + this->m_sets_shift))) ) |
---|
| 840 | { |
---|
| 841 | vic_nline = nline(way,m_set); |
---|
| 842 | this->clearvalid(way,m_set); |
---|
| 843 | break; |
---|
| 844 | } |
---|
| 845 | |
---|
| 846 | if( this->valid(way,k_set) && !(this->pagesize(way,k_set)) && |
---|
| 847 | (this->vpn(way,k_set) == (vaddress >> (PAGE_K_NBITS + this->m_sets_shift))) ) |
---|
| 848 | { |
---|
| 849 | vic_nline = nline(way,k_set); |
---|
| 850 | this->clearvalid(way,k_set); |
---|
| 851 | break; |
---|
| 852 | } |
---|
| 853 | if ( way == (this->m_nways-1)) return false; |
---|
| 854 | } |
---|
| 855 | |
---|
| 856 | *victim = vic_nline; |
---|
| 857 | return true; |
---|
| 858 | } // end inval1() |
---|
| 859 | |
---|
| 860 | ////////////////////////////////////////////////////////////// |
---|
| 861 | // This method coherence invalidates a TLB entry |
---|
| 862 | // identified by the virtual page number. |
---|
| 863 | ////////////////////////////////////////////////////////////// |
---|
| 864 | void ccinval(size_t invway, size_t invset) |
---|
| 865 | { |
---|
| 866 | this->clearvalid(invway,invset); |
---|
| 867 | } // end ccinval() |
---|
| 868 | |
---|
| 869 | ////////////////////////////////////////////////////////////// |
---|
| 870 | // This method coherence invalidates a TLB entry |
---|
| 871 | // identified by the virtual page number. |
---|
| 872 | ////////////////////////////////////////////////////////////// |
---|
| 873 | size_t getnline(size_t way, size_t set) |
---|
| 874 | { |
---|
| 875 | return nline(way,set); |
---|
| 876 | } // end getnline() |
---|
| 877 | |
---|
| 878 | ///////////////////////////////////////////////////////////// |
---|
| 879 | // This method for cc_vcache2 is used for context switch. |
---|
| 880 | // In this case, allTLB entries should be invalidated except |
---|
| 881 | // global entries.All the entries that are in the same data |
---|
| 882 | // cache line have the same NLINE. Therefore only all the |
---|
| 883 | // entries of one datacache line are not global, it send a |
---|
| 884 | // cleanup request todata cache. The return value indicates |
---|
| 885 | // whether need a cleanupand cleanup_nline contains the NLINE |
---|
| 886 | // that is for cleanup. |
---|
| 887 | ///////////////////////////////////////////////////////////// |
---|
| 888 | bool checkcleanup(size_t nway, size_t nset, paddr_t* cleanup_nline) |
---|
| 889 | { |
---|
| 890 | bool cleanup = false; |
---|
| 891 | bool isglobal = false; |
---|
| 892 | if ( this->valid(nway,nset) ) |
---|
| 893 | { |
---|
| 894 | size_t inval_line = nline(nway,nset); |
---|
| 895 | for (size_t start = (nway*this->m_nsets+nset); start < this->m_nways*this->m_nsets; start++) |
---|
| 896 | { |
---|
| 897 | if ( this->valid(start/this->m_nsets,start%this->m_nsets) && (inval_line == nline(start/this->m_nsets,start%this->m_nsets)) ) |
---|
| 898 | { |
---|
| 899 | if (!this->global(start/this->m_nsets,start%this->m_nsets)) |
---|
| 900 | { |
---|
| 901 | this->clearvalid(start/this->m_nsets,start%this->m_nsets); |
---|
| 902 | } |
---|
| 903 | else |
---|
| 904 | { |
---|
| 905 | isglobal = true; |
---|
| 906 | } |
---|
| 907 | } |
---|
| 908 | } |
---|
| 909 | |
---|
| 910 | cleanup = !isglobal; |
---|
| 911 | if(cleanup) |
---|
| 912 | *cleanup_nline = inval_line; |
---|
| 913 | } |
---|
| 914 | return cleanup; |
---|
| 915 | } // end checkcleanup |
---|
| 916 | |
---|
| 917 | ///////////////////////////////////////////////////////////// |
---|
| 918 | // This method for cc_vcache is used for context switch. |
---|
| 919 | // In this case, allTLB entries should be invalidated except |
---|
| 920 | // global entries.All the entries that are in the same data |
---|
| 921 | // cache line have the same NLINE. Therefore only all the |
---|
| 922 | // entries of one datacache line are not global, it send a |
---|
| 923 | // cleanup request todata cache. The return value indicates |
---|
| 924 | // whether need a cleanupand cleanup_nline contains the NLINE |
---|
| 925 | // that is for cleanup. |
---|
| 926 | ///////////////////////////////////////////////////////////// |
---|
| 927 | bool checkcleanup1(size_t nway, size_t nset, paddr_t* cleanup_nline) |
---|
| 928 | { |
---|
| 929 | bool cleanup = false; |
---|
| 930 | bool isglobal = false; |
---|
| 931 | if ( this->valid(nway,nset) ) |
---|
| 932 | { |
---|
| 933 | size_t inval_line = nline(nway,nset); |
---|
| 934 | if (!this->global(nway,nset)) |
---|
| 935 | { |
---|
| 936 | this->clearvalid(nway,nset); |
---|
| 937 | } |
---|
| 938 | else |
---|
| 939 | { |
---|
| 940 | isglobal = true; |
---|
| 941 | } |
---|
| 942 | |
---|
| 943 | cleanup = !isglobal; |
---|
| 944 | if(cleanup) |
---|
| 945 | *cleanup_nline = inval_line; |
---|
| 946 | } |
---|
| 947 | return cleanup; |
---|
| 948 | } // end checkcleanup1 |
---|
| 949 | |
---|
| 950 | ////////////////////////////////////////////////////////////////////////// |
---|
| 951 | // This method searchs a place for the missed TLB entry, if there is victim, |
---|
| 952 | // a cleanup must be sent. |
---|
| 953 | ////////////////////////////////////////////////////////////////////////// |
---|
| 954 | bool select(vaddr_t vaddress, paddr_t* victim, size_t *newway, size_t *newset) |
---|
| 955 | { |
---|
| 956 | size_t selset = vaddress & this->m_sets_mask; |
---|
| 957 | size_t selway = this->getlru(selset); |
---|
| 958 | bool cleanup = this->valid(selway,selset); |
---|
| 959 | |
---|
| 960 | if (cleanup) { |
---|
| 961 | for( size_t way = 0; way < this->m_nways; way++ ) |
---|
| 962 | { |
---|
| 963 | for( size_t set = 0; set < this->m_nsets; set++ ) |
---|
| 964 | { |
---|
| 965 | if ((way == selway) && (set == selset)) |
---|
| 966 | continue; |
---|
| 967 | if ((nline(way,set) == nline(selway,selset)) && this->valid(way,set)) |
---|
| 968 | { |
---|
| 969 | cleanup = false; |
---|
| 970 | break; |
---|
| 971 | } |
---|
| 972 | } |
---|
| 973 | } |
---|
| 974 | } |
---|
| 975 | |
---|
| 976 | if (cleanup) *victim = nline(selway,selset); |
---|
| 977 | *newway = selway; |
---|
| 978 | *newset = selset; |
---|
| 979 | return cleanup; |
---|
| 980 | } |
---|
| 981 | |
---|
| 982 | ////////////////////////////////////////////////////////////////////////// |
---|
| 983 | // This method searchs a place for the missed TLB entry, if there is victim, |
---|
| 984 | // a cleanup must be sent. |
---|
| 985 | ////////////////////////////////////////////////////////////////////////// |
---|
| 986 | bool select1(vaddr_t vaddress, paddr_t* victim, size_t *newway, size_t *newset) |
---|
| 987 | { |
---|
| 988 | size_t selset = vaddress & this->m_sets_mask; |
---|
| 989 | size_t selway = this->getlru(selset); |
---|
| 990 | bool cleanup = this->valid(selway,selset); |
---|
| 991 | |
---|
| 992 | if (cleanup) *victim = nline(selway,selset); |
---|
| 993 | *newway = selway; |
---|
| 994 | *newset = selset; |
---|
| 995 | return cleanup; |
---|
| 996 | } |
---|
| 997 | |
---|
| 998 | ////////////////////////////////////////////////////////////////////////// |
---|
| 999 | // This method writes a new 2M page size entry in the TLB for cc_vcache2. |
---|
| 1000 | ////////////////////////////////////////////////////////////////////////// |
---|
| 1001 | void update(data_t pte, vaddr_t vaddress, size_t selway, size_t selset, paddr_t line) |
---|
| 1002 | { |
---|
| 1003 | this->vpn(selway,selset) = vaddress >> (PAGE_M_NBITS + this->m_sets_shift); |
---|
| 1004 | this->ppn(selway,selset) = pte & ((1<<(this->m_paddr_nbits - PAGE_M_NBITS))-1); |
---|
| 1005 | |
---|
| 1006 | this->setvalid(selway,selset); |
---|
| 1007 | this->pagesize(selway,selset) = true; |
---|
| 1008 | this->setlru(selway,selset); |
---|
| 1009 | |
---|
| 1010 | this->locacc(selway,selset) = (((pte & PTE_L_MASK) >> PTE_L_SHIFT) == 1) ? true : false; |
---|
| 1011 | this->remacc(selway,selset) = (((pte & PTE_R_MASK) >> PTE_R_SHIFT) == 1) ? true : false; |
---|
| 1012 | this->cacheable(selway,selset) = (((pte & PTE_C_MASK) >> PTE_C_SHIFT) == 1) ? true : false; |
---|
| 1013 | this->writable(selway,selset) = (((pte & PTE_W_MASK) >> PTE_W_SHIFT) == 1) ? true : false; |
---|
| 1014 | this->executable(selway,selset) = (((pte & PTE_X_MASK) >> PTE_X_SHIFT) == 1) ? true : false; |
---|
| 1015 | this->user(selway,selset) = (((pte & PTE_U_MASK) >> PTE_U_SHIFT) == 1) ? true : false; |
---|
| 1016 | if (((pte & PTE_G_MASK) >> PTE_G_SHIFT) == 1) |
---|
| 1017 | this->setglobal(selway,selset); |
---|
| 1018 | else |
---|
| 1019 | this->clearglobal(selway,selset); |
---|
| 1020 | this->dirty(selway,selset) = (((pte & PTE_D_MASK) >> PTE_D_SHIFT) == 1) ? true : false; |
---|
| 1021 | nline(selway,selset) = line; |
---|
| 1022 | } // end update() |
---|
| 1023 | |
---|
| 1024 | ////////////////////////////////////////////////////////////////////////// |
---|
| 1025 | // This method writes a new 4K page size entry in the TLB for cc_vcache2. |
---|
| 1026 | ////////////////////////////////////////////////////////////////////////// |
---|
| 1027 | void update(data_t pte, data_t ppn2, vaddr_t vaddress, size_t selway, size_t selset, paddr_t line) |
---|
| 1028 | { |
---|
| 1029 | this->vpn(selway,selset) = vaddress >> (PAGE_K_NBITS + this->m_sets_shift); |
---|
| 1030 | this->ppn(selway,selset) = ppn2 & ((1<<(this->m_paddr_nbits - PAGE_K_NBITS))-1); |
---|
| 1031 | this->setvalid(selway,selset); |
---|
| 1032 | this->pagesize(selway,selset) = false; |
---|
| 1033 | this->setlru(selway,selset); |
---|
| 1034 | |
---|
| 1035 | this->locacc(selway,selset) = (((pte & PTE_L_MASK) >> PTE_L_SHIFT) == 1) ? true : false; |
---|
| 1036 | this->remacc(selway,selset) = (((pte & PTE_R_MASK) >> PTE_R_SHIFT) == 1) ? true : false; |
---|
| 1037 | this->cacheable(selway,selset) = (((pte & PTE_C_MASK) >> PTE_C_SHIFT) == 1) ? true : false; |
---|
| 1038 | this->writable(selway,selset) = (((pte & PTE_W_MASK) >> PTE_W_SHIFT) == 1) ? true : false; |
---|
| 1039 | this->executable(selway,selset) = (((pte & PTE_X_MASK) >> PTE_X_SHIFT) == 1) ? true : false; |
---|
| 1040 | this->user(selway,selset) = (((pte & PTE_U_MASK) >> PTE_U_SHIFT) == 1) ? true : false; |
---|
| 1041 | if (((pte & PTE_G_MASK) >> PTE_G_SHIFT) == 1) |
---|
| 1042 | this->setglobal(selway,selset); |
---|
| 1043 | else |
---|
| 1044 | this->clearglobal(selway,selset); |
---|
| 1045 | |
---|
| 1046 | this->dirty(selway,selset) = (((pte & PTE_D_MASK) >> PTE_D_SHIFT) == 1) ? true : false; |
---|
| 1047 | |
---|
| 1048 | nline(selway,selset) = line; |
---|
| 1049 | } // end update() |
---|
| 1050 | #if 0 |
---|
| 1051 | ////////////////////////////////////////////////////////////////////////// |
---|
| 1052 | // This method writes a new 4K page size entry in the TLB for cc_vcache. |
---|
| 1053 | ////////////////////////////////////////////////////////////////////////// |
---|
| 1054 | bool update1(data_t pte, data_t ppn2, vaddr_t vaddress, paddr_t line, paddr_t* victim ) |
---|
| 1055 | { |
---|
| 1056 | size_t set = (vaddress >> PAGE_K_NBITS) & this->m_sets_mask; |
---|
| 1057 | size_t selway = this->getlru(set); |
---|
| 1058 | bool cleanup = this->valid(selway,set); |
---|
| 1059 | |
---|
| 1060 | this->vpn(selway,set) = vaddress >> (PAGE_K_NBITS + this->m_sets_shift); |
---|
| 1061 | this->ppn(selway,set) = ppn2 & ((1<<(this->m_paddr_nbits - PAGE_K_NBITS))-1); |
---|
| 1062 | this->setvalid(selway,set); |
---|
| 1063 | this->pagesize(selway,set) = false; |
---|
| 1064 | this->setlru(selway,set); |
---|
| 1065 | |
---|
| 1066 | this->locacc(selway,set) = (((pte & PTE_L_MASK) >> PTE_L_SHIFT) == 1) ? true : false; |
---|
| 1067 | this->remacc(selway,set) = (((pte & PTE_R_MASK) >> PTE_R_SHIFT) == 1) ? true : false; |
---|
| 1068 | this->cacheable(selway,set) = (((pte & PTE_C_MASK) >> PTE_C_SHIFT) == 1) ? true : false; |
---|
| 1069 | this->writable(selway,set) = (((pte & PTE_W_MASK) >> PTE_W_SHIFT) == 1) ? true : false; |
---|
| 1070 | this->executable(selway,set) = (((pte & PTE_X_MASK) >> PTE_X_SHIFT) == 1) ? true : false; |
---|
| 1071 | this->user(selway,set) = (((pte & PTE_U_MASK) >> PTE_U_SHIFT) == 1) ? true : false; |
---|
| 1072 | if (((pte & PTE_G_MASK) >> PTE_G_SHIFT) == 1) |
---|
| 1073 | this->setglobal(selway,set); |
---|
| 1074 | else |
---|
| 1075 | this->clearglobal(selway,set); |
---|
| 1076 | this->dirty(selway,set) = (((pte & PTE_D_MASK) >> PTE_D_SHIFT) == 1) ? true : false; |
---|
| 1077 | |
---|
| 1078 | *victim = nline(selway,set); |
---|
| 1079 | nline(selway,set) = line; |
---|
| 1080 | |
---|
| 1081 | return cleanup; |
---|
| 1082 | } // end update1() |
---|
| 1083 | #endif |
---|
| 1084 | ////////////////////////////////////////////////////////////// |
---|
| 1085 | // This method verify whether all 16 words of a data cache line |
---|
| 1086 | // that are as PTE don't exist in TLB. If is true, a cleanup |
---|
| 1087 | // request is actived. |
---|
| 1088 | ////////////////////////////////////////////////////////////// |
---|
| 1089 | bool cleanupcheck( paddr_t n_line ) |
---|
| 1090 | { |
---|
| 1091 | for( size_t way = 0; way < this->m_nways; way++ ) |
---|
| 1092 | { |
---|
| 1093 | for( size_t set = 0; set < this->m_nsets; set++ ) |
---|
| 1094 | { |
---|
| 1095 | if ( (nline(way,set) == n_line) && this->valid(way,set) ) |
---|
| 1096 | { |
---|
| 1097 | return true; |
---|
| 1098 | } |
---|
| 1099 | } |
---|
| 1100 | } |
---|
| 1101 | return false; |
---|
| 1102 | } // end cccheck() |
---|
| 1103 | |
---|
| 1104 | ////////////////////////////////////////////////////////////// |
---|
| 1105 | // This method invalidates a TLB entry |
---|
| 1106 | // identified by the virtual page number. |
---|
| 1107 | ////////////////////////////////////////////////////////////// |
---|
| 1108 | bool cccheck( paddr_t n_line, |
---|
| 1109 | size_t start_way, size_t start_set, |
---|
| 1110 | size_t* n_way, size_t* n_set, |
---|
| 1111 | bool* end ) |
---|
| 1112 | { |
---|
| 1113 | for ( size_t start = start_way*(this->m_nsets)+start_set; start < this->m_nways*this->m_nsets; start++ ) |
---|
| 1114 | { |
---|
| 1115 | if (( nline((start/this->m_nsets),(start%this->m_nsets)) == n_line ) && this->valid((start/this->m_nsets),(start%this->m_nsets))) |
---|
| 1116 | { |
---|
| 1117 | *n_way = start/this->m_nsets; |
---|
| 1118 | *n_set = start%this->m_nsets; |
---|
| 1119 | if ( ((start/this->m_nsets) == (this->m_nways-1)) && ((start%this->m_nsets) == (this->m_nsets-1)) ) |
---|
| 1120 | { |
---|
| 1121 | *end = true; |
---|
| 1122 | } |
---|
| 1123 | else |
---|
| 1124 | { |
---|
| 1125 | *end = false; |
---|
| 1126 | } |
---|
| 1127 | return true; |
---|
| 1128 | } |
---|
| 1129 | } |
---|
| 1130 | *end = true; |
---|
| 1131 | return false; |
---|
| 1132 | } // end cccheck() |
---|
| 1133 | }; // GenericCcTlb |
---|
| 1134 | |
---|
| 1135 | }} |
---|
| 1136 | |
---|
| 1137 | #endif /* SOCLIB_CABA_GENERIC_TLB_H */ |
---|
| 1138 | |
---|
| 1139 | // Local Variables: |
---|
| 1140 | // tab-width: 4 |
---|
| 1141 | // c-basic-offset: 4 |
---|
| 1142 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
---|
| 1143 | // indent-tabs-mode: nil |
---|
| 1144 | // End: |
---|
| 1145 | |
---|
| 1146 | // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
---|
| 1147 | |
---|
| 1148 | |
---|
| 1149 | |
---|