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[/] [openrisc/] [trunk/] [or1ksim/] [pcu/] [pcu.c] - Rev 590
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/* pcu.c -- Simulation of OR1k performance counters Copyright (C) 2011 Julius Baxter, julius@opencores.org This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* This program is commented throughout in a fashion suitable for processing with Doxygen. */ #include "config.h" #include "sim-config.h" #include "execute.h" #include "pcu.h" /*---------------------------------------------------------------------------*/ /*!Increment a PCCR depending on the event Check the event, see if any PCMRs are set to increment, and permissions and increment the corresponding PCCR. The performance counters unit relies on a call to pcu_count_event() being placed a the appropriate place elsewhere in the simulator code. At present only instruction fetch, LSU accesses, MMU and cache misses are logged. Counts for other things such as stalls for LSU or fetch can probably be done but haven't been, yet. The function expects to receive the bit of the PCMR to check against for incrementing. See the existing use of the function in the cpu/common/abstract.c file which is where LSU accesses and instruction fetches are logged. @param[in] event The event that has occurred (PCMR bit) */ /*---------------------------------------------------------------------------*/ void pcu_count_event(unsigned event) { int i; // Look through each PCMR, check if this event should be logged for(i=0;i<8;i++) if ((event & cpu_state.sprs[SPR_PCMR(i)]) && // Count in SM, and SR[SM] set (((cpu_state.sprs[SPR_PCMR(i)] & SPR_PCMR_CISM) && (cpu_state.sprs[SPR_SR] & SPR_SR_SM)) || // Count in UM and SR[SM] cleared ((cpu_state.sprs[SPR_PCMR(i)] & SPR_PCMR_CIUM) && !(cpu_state.sprs[SPR_SR] & SPR_SR_SM)))) { cpu_state.sprs[SPR_PCCR(i)]++; } } /*---------------------------------------------------------------------------*/ /*!Enable or disable the performance counters unit Set the corresponding field in the UPR, set present bit in all PCMRs @param[in] val The value to use @param[in] dat The config data structure (not used here) */ /*---------------------------------------------------------------------------*/ static void pcu_enabled (union param_val val, void *dat) { if (val.int_val) { cpu_state.sprs[SPR_UPR] |= SPR_UPR_PCUP; cpu_state.sprs[SPR_PCMR(0)] = SPR_PCMR_CP; cpu_state.sprs[SPR_PCMR(1)] = SPR_PCMR_CP; cpu_state.sprs[SPR_PCMR(2)] = SPR_PCMR_CP; cpu_state.sprs[SPR_PCMR(3)] = SPR_PCMR_CP; cpu_state.sprs[SPR_PCMR(4)] = SPR_PCMR_CP; cpu_state.sprs[SPR_PCMR(5)] = SPR_PCMR_CP; cpu_state.sprs[SPR_PCMR(6)] = SPR_PCMR_CP; cpu_state.sprs[SPR_PCMR(7)] = SPR_PCMR_CP; } else { cpu_state.sprs[SPR_UPR] &= ~SPR_UPR_PCUP; } config.pcu.enabled = val.int_val; } /* pcu_enabled() */ /*---------------------------------------------------------------------------*/ /*!Register the configuration functions for the performance counters unit */ /*---------------------------------------------------------------------------*/ void reg_pcu_sec () { struct config_section *sec = reg_config_sec ("pcu", NULL, NULL); reg_config_param (sec, "enabled", PARAMT_INT, pcu_enabled); } /* reg_pcu_sec () */
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