- Timestamp:
- Sep 11, 2012, 12:43:28 PM (12 years ago)
- File:
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- 1 edited
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trunk/modules/vci_cc_vcache_wrapper_v4/caba/source/src/vci_cc_vcache_wrapper_v4.cpp
r254 r262 1978 1978 { 1979 1979 case DCACHE_IDLE: // There is 8 conditions to exit the IDLE state : 1980 // 1) Dirty bit update (processor) 1981 // 2) Coherence request (TGT FSM) 1982 // 3) ITLB miss request (ICACHE FSM) 1983 // 4) XTN request (processor) 1984 // 5) DTLB miss (processor) 1985 // 6) Cacheable read miss (processor) 1986 // 7) Uncacheable read (processor) 1987 // 8) SC access (processor) 1980 // 1) Dirty bit update (processor) => DCACHE_DIRTY_GET_PTE 1981 // 2) Coherence request (TGT FSM) => DCACHE_CC_CHECK 1982 // 3) ITLB miss request (ICACHE FSM) => DCACHE_TLB_MISS 1983 // 4) XTN request (processor) => DCACHE_XTN_* 1984 // 5) DTLB miss (processor) => DCACHE_TLB_MISS 1985 // 6) Cacheable read miss (processor) => DCACHE_MISS_VICTIM 1986 // 7) Uncacheable read (processor) => DCACHE_UNC_WAIT 1987 // 8) SC access (processor) => DCACHE_SC_WAIT 1988 1988 // 1989 1989 // The dtlb is unconditionally accessed to translate the … … 2962 2962 ////////////////////////// 2963 2963 case DCACHE_TLB_PTE1_UPDT: // write a new PTE1 in tlb after testing the L/R bit 2964 // if L/R bit already set, exit the sub-fsm 2965 // if not, the page table must be updated 2966 { 2967 paddr_t nline = r_dcache_tlb_paddr.read() >> (uint32_log2(m_dcache_words)+2); 2968 uint32_t pte = r_dcache_tlb_pte_flags.read(); 2969 bool updt = false; 2970 bool local = true; 2964 // - if L/R bit already set, exit the sub-fsm. 2965 // - if not, we update the page table but we dont write 2966 // neither in DCACHE, nor in TLB, as this will be done by 2967 // the coherence mechanism. 2968 { 2969 paddr_t nline = r_dcache_tlb_paddr.read() >> (uint32_log2(m_dcache_words)+2); 2970 uint32_t pte = r_dcache_tlb_pte_flags.read(); 2971 bool pt_updt = false; 2972 bool local = true; 2971 2973 2972 2974 // We should compute the access locality: … … 2981 2983 if ( not ((pte & PTE_L_MASK) == PTE_L_MASK) ) // we must set the L bit 2982 2984 { 2983 updt = true;2984 r_dcache_vci_sc_old = pte;2985 r_dcache_vci_sc_new = pte | PTE_L_MASK;2986 pte = pte | PTE_L_MASK;2987 2985 pt_updt = true; 2986 r_dcache_vci_sc_old = pte; 2987 r_dcache_vci_sc_new = pte | PTE_L_MASK; 2988 pte = pte | PTE_L_MASK; 2989 r_dcache_tlb_pte_flags = pte; 2988 2990 } 2989 2991 } … … 2992 2994 if ( not ((pte & PTE_R_MASK) == PTE_R_MASK) ) // we must set the R bit 2993 2995 { 2994 updt = true; 2995 r_dcache_vci_sc_old = pte; 2996 r_dcache_vci_sc_new = pte | PTE_R_MASK; 2997 pte = pte | PTE_R_MASK; 2998 r_dcache_tlb_pte_flags = pte; 2999 } 3000 } 3001 3002 // update TLB 3003 if ( r_dcache_tlb_ins.read() ) 3004 { 3005 r_itlb.write( true, // 2M page 3006 pte, 3007 0, // argument unused for a PTE1 3008 r_dcache_tlb_vaddr.read(), 3009 r_dcache_tlb_way.read(), 3010 r_dcache_tlb_set.read(), 3011 nline ); 2996 pt_updt = true; 2997 r_dcache_vci_sc_old = pte; 2998 r_dcache_vci_sc_new = pte | PTE_R_MASK; 2999 pte = pte | PTE_R_MASK; 3000 r_dcache_tlb_pte_flags = pte; 3001 } 3002 } 3003 3004 if ( not pt_updt ) // update TLB and return 3005 { 3006 if ( r_dcache_tlb_ins.read() ) 3007 { 3008 r_itlb.write( true, // 2M page 3009 pte, 3010 0, // argument unused for a PTE1 3011 r_dcache_tlb_vaddr.read(), 3012 r_dcache_tlb_way.read(), 3013 r_dcache_tlb_set.read(), 3014 nline ); 3012 3015 #ifdef INSTRUMENTATION 3013 3016 m_cpt_itlb_write++; 3014 3017 #endif 3015 }3016 else3017 {3018 r_dtlb.write( true, // 2M page3019 pte,3020 0, // argument unused for a PTE13021 r_dcache_tlb_vaddr.read(),3022 r_dcache_tlb_way.read(),3023 r_dcache_tlb_set.read(),3024 nline );3025 #ifdef INSTRUMENTATION3026 m_cpt_dtlb_write++;3027 #endif3028 }3029 // next state3030 if ( updt ) r_dcache_fsm = DCACHE_TLB_LR_UPDT; // dcache and page table update3031 else r_dcache_fsm = DCACHE_TLB_RETURN; // exit sub-fsm3032 3018 3033 3019 #if DEBUG_DCACHE 3034 3020 if ( m_debug_dcache_fsm ) 3035 3021 { 3036 if ( r_dcache_tlb_ins.read() ) 3037 { 3038 std::cout << " <PROC " << name() << ".DCACHE_TLB_PTE1_UPDT> write PTE1 in ITLB"; 3039 std::cout << " / set = " << std::dec << r_dcache_tlb_set.read() 3040 << " / way = " << r_dcache_tlb_way.read() << std::endl; 3041 r_itlb.printTrace(); 3042 } 3043 else 3044 { 3045 std::cout << " <PROC " << name() << ".DCACHE_TLB_PTE1_UPDT> write PTE1 in DTLB"; 3046 std::cout << " / set = " << std::dec << r_dcache_tlb_set.read() 3047 << " / way = " << r_dcache_tlb_way.read() << std::endl; 3048 r_dtlb.printTrace(); 3049 } 3050 3022 std::cout << " <PROC " << name() << ".DCACHE_TLB_PTE1_UPDT> write PTE1 in ITLB"; 3023 std::cout << " / set = " << std::dec << r_dcache_tlb_set.read() 3024 << " / way = " << r_dcache_tlb_way.read() << std::endl; 3025 r_itlb.printTrace(); 3051 3026 } 3052 3027 #endif 3028 } 3029 else 3030 { 3031 r_dtlb.write( true, // 2M page 3032 pte, 3033 0, // argument unused for a PTE1 3034 r_dcache_tlb_vaddr.read(), 3035 r_dcache_tlb_way.read(), 3036 r_dcache_tlb_set.read(), 3037 nline ); 3038 #ifdef INSTRUMENTATION 3039 m_cpt_dtlb_write++; 3040 #endif 3041 3042 #if DEBUG_DCACHE 3043 if ( m_debug_dcache_fsm ) 3044 { 3045 std::cout << " <PROC " << name() << ".DCACHE_TLB_PTE1_UPDT> write PTE1 in DTLB"; 3046 std::cout << " / set = " << std::dec << r_dcache_tlb_set.read() 3047 << " / way = " << r_dcache_tlb_way.read() << std::endl; 3048 r_dtlb.printTrace(); 3049 } 3050 #endif 3051 } 3052 r_dcache_fsm = DCACHE_TLB_RETURN; 3053 } 3054 else // update page table but not TLB 3055 { 3056 r_dcache_fsm = DCACHE_TLB_LR_UPDT; 3057 3058 #if DEBUG_DCACHE 3059 if ( m_debug_dcache_fsm ) 3060 { 3061 std::cout << " <PROC " << name() << ".DCACHE_TLB_PTE1_UPDT> L/R bit update required" 3062 << std::endl; 3063 } 3064 #endif 3065 } 3053 3066 break; 3054 3067 } … … 3182 3195 } 3183 3196 ////////////////////////// 3184 case DCACHE_TLB_PTE2_UPDT: // write a new PTE2 in tlb after testing the L/R bit 3185 // if L/R bit already set, exit the sub-fsm 3186 // if not, the page table must be updated by an atomic access 3197 case DCACHE_TLB_PTE2_UPDT: // write a new PTE2 in tlb after testing the L/R bit 3198 // - if L/R bit already set, exit the sub-fsm. 3199 // - if not, we update the page table but we dont write 3200 // neither in DCACHE, nor in TLB, as this will be done by 3201 // the coherence mechanism. 3187 3202 { 3188 3203 paddr_t nline = r_dcache_tlb_paddr.read() >> (uint32_log2(m_dcache_words)+2); 3189 3204 uint32_t pte_flags = r_dcache_tlb_pte_flags.read(); 3190 3205 uint32_t pte_ppn = r_dcache_tlb_pte_ppn.read(); 3191 bool updt= false;3206 bool pt_updt = false; 3192 3207 bool local = true; 3193 3208 … … 3203 3218 if ( not ((pte_flags & PTE_L_MASK) == PTE_L_MASK) ) // we must set the L bit 3204 3219 { 3205 updt = true;3206 r_dcache_vci_sc_old = pte_flags;3207 r_dcache_vci_sc_new = pte_flags | PTE_L_MASK;3208 pte_flags = pte_flags | PTE_L_MASK;3209 r_dcache_tlb_pte_flags = pte_flags;3220 pt_updt = true; 3221 r_dcache_vci_sc_old = pte_flags; 3222 r_dcache_vci_sc_new = pte_flags | PTE_L_MASK; 3223 pte_flags = pte_flags | PTE_L_MASK; 3224 r_dcache_tlb_pte_flags = pte_flags; 3210 3225 } 3211 3226 } … … 3214 3229 if ( not ((pte_flags & PTE_R_MASK) == PTE_R_MASK) ) // we must set the R bit 3215 3230 { 3216 updt= true;3217 r_dcache_vci_sc_old = pte_flags;3218 r_dcache_vci_sc_new = pte_flags | PTE_R_MASK;3219 pte_flags = pte_flags | PTE_R_MASK;3220 r_dcache_tlb_pte_flags = pte_flags;3231 pt_updt = true; 3232 r_dcache_vci_sc_old = pte_flags; 3233 r_dcache_vci_sc_new = pte_flags | PTE_R_MASK; 3234 pte_flags = pte_flags | PTE_R_MASK; 3235 r_dcache_tlb_pte_flags = pte_flags; 3221 3236 } 3222 3237 } 3223 3238 3224 // update TLB for a PTE2 3225 if ( r_dcache_tlb_ins.read() ) 3226 { 3227 r_itlb.write( false, // 4K page 3228 pte_flags, 3229 pte_ppn, 3230 r_dcache_tlb_vaddr.read(), 3231 r_dcache_tlb_way.read(), 3232 r_dcache_tlb_set.read(), 3233 nline ); 3239 if ( not pt_updt ) // update TLB 3240 { 3241 if ( r_dcache_tlb_ins.read() ) 3242 { 3243 r_itlb.write( false, // 4K page 3244 pte_flags, 3245 pte_ppn, 3246 r_dcache_tlb_vaddr.read(), 3247 r_dcache_tlb_way.read(), 3248 r_dcache_tlb_set.read(), 3249 nline ); 3234 3250 #ifdef INSTRUMENTATION 3235 3251 m_cpt_itlb_write++; 3236 3252 #endif 3237 }3238 else3239 {3240 r_dtlb.write( false, // 4K page3241 pte_flags,3242 pte_ppn,3243 r_dcache_tlb_vaddr.read(),3244 r_dcache_tlb_way.read(),3245 r_dcache_tlb_set.read(),3246 nline );3247 #ifdef INSTRUMENTATION3248 m_cpt_dtlb_write++;3249 #endif3250 }3251 3253 3252 3254 #if DEBUG_DCACHE 3253 3255 if ( m_debug_dcache_fsm ) 3254 3256 { 3255 if ( r_dcache_tlb_ins.read() ) 3256 { 3257 std::cout << " <PROC " << name() << ".DCACHE_TLB_PTE2_UPDT> write PTE2 in ITLB"; 3258 std::cout << " / set = " << std::dec << r_dcache_tlb_set.read() 3259 << " / way = " << r_dcache_tlb_way.read() << std::endl; 3260 r_itlb.printTrace(); 3261 } 3262 else 3263 { 3264 std::cout << " <PROC " << name() << ".DCACHE_TLB_PTE2_UPDT> write PTE2 in DTLB"; 3265 std::cout << " / set = " << std::dec << r_dcache_tlb_set.read() 3266 << " / way = " << r_dcache_tlb_way.read() << std::endl; 3267 r_dtlb.printTrace(); 3268 } 3257 std::cout << " <PROC " << name() << ".DCACHE_TLB_PTE2_UPDT> write PTE2 in ITLB"; 3258 std::cout << " / set = " << std::dec << r_dcache_tlb_set.read() 3259 << " / way = " << r_dcache_tlb_way.read() << std::endl; 3260 r_itlb.printTrace(); 3269 3261 } 3270 3262 #endif 3271 // next state 3272 if ( updt ) r_dcache_fsm = DCACHE_TLB_LR_UPDT; // dcache and page table update 3273 else r_dcache_fsm = DCACHE_TLB_RETURN; // exit sub-fsm 3263 } 3264 else 3265 { 3266 r_dtlb.write( false, // 4K page 3267 pte_flags, 3268 pte_ppn, 3269 r_dcache_tlb_vaddr.read(), 3270 r_dcache_tlb_way.read(), 3271 r_dcache_tlb_set.read(), 3272 nline ); 3273 #ifdef INSTRUMENTATION 3274 m_cpt_dtlb_write++; 3275 #endif 3276 3277 #if DEBUG_DCACHE 3278 if ( m_debug_dcache_fsm ) 3279 { 3280 std::cout << " <PROC " << name() << ".DCACHE_TLB_PTE2_UPDT> write PTE2 in DTLB"; 3281 std::cout << " / set = " << std::dec << r_dcache_tlb_set.read() 3282 << " / way = " << r_dcache_tlb_way.read() << std::endl; 3283 r_dtlb.printTrace(); 3284 } 3285 #endif 3286 3287 } 3288 r_dcache_fsm = DCACHE_TLB_RETURN; 3289 } 3290 else // update page table but not TLB 3291 { 3292 r_dcache_fsm = DCACHE_TLB_LR_UPDT; // dcache and page table update 3293 3294 #if DEBUG_DCACHE 3295 if ( m_debug_dcache_fsm ) 3296 { 3297 std::cout << " <PROC " << name() << ".DCACHE_TLB_PTE2_UPDT> L/R bit update required" 3298 << std::endl; 3299 } 3300 #endif 3301 } 3274 3302 break; 3275 3303 } 3276 3304 //////////////////////// 3277 case DCACHE_TLB_LR_UPDT: // update the dcache after a tlb miss (L/R bit), 3278 // request a SC transaction to CMD FSM 3305 case DCACHE_TLB_LR_UPDT: // request a SC transaction to update L/R bit 3279 3306 { 3280 3307 #if DEBUG_DCACHE … … 3284 3311 } 3285 3312 #endif 3286 r_dcache.write(r_dcache_tlb_cache_way.read(),3287 r_dcache_tlb_cache_set.read(),3288 r_dcache_tlb_cache_word.read(),3289 r_dcache_tlb_pte_flags.read());3290 #ifdef INSTRUMENTATION3291 m_cpt_dcache_data_write++;3292 #endif3293 3313 // r_dcache_vci_sc_old & r_dcache_vci_sc_new registers are already set 3294 3314 r_dcache_vci_paddr = r_dcache_tlb_paddr.read(); … … 3298 3318 } 3299 3319 //////////////////////// 3300 case DCACHE_TLB_LR_WAIT: // Waiting the response to SC transaction .3320 case DCACHE_TLB_LR_WAIT: // Waiting the response to SC transaction for DIRTY bit. 3301 3321 // We consume the response in rsp FIFO, 3302 3322 // and exit the sub-fsm, but we don't … … 3990 4010 } 3991 4011 ////////////////////////// 3992 case DCACHE_DIRTY_SC_WAIT: // wait completion of SC for PTE Dirty bit 3993 // If PTE update is a success, return to IDLE state. 3994 // If PTE update is a failure, invalidate cache line 3995 // in DCACHE and invalidate the matching TLB entries. 4012 case DCACHE_DIRTY_SC_WAIT: // wait completion of SC for PTE Dirty bit, 4013 // and return to IDLE state when response is received. 4014 // we don't care if the SC is a failure: 4015 // - if the SC is a success, the coherence mechanism 4016 // updates the local copy. 4017 // - if the SC is a failure, we just retry the write. 3996 4018 { 3997 4019 // external coherence request
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