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[/] [or1k/] [tags/] [rel-0-3-0-rc3/] [or1ksim/] [pic/] [pic.c] - Rev 1350
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/* pic.c -- Simulation of OpenRISC 1000 programmable interrupt controller Copyright (C) 1999 Damjan Lampret, lampret@opencores.org This file is part of 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* This is functional simulation of OpenRISC 1000 architectural programmable interrupt controller. */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include "config.h" #ifdef HAVE_INTTYPES_H #include <inttypes.h> #endif #include "port.h" #include "arch.h" #include "abstract.h" #include "pic.h" #include "spr_defs.h" #include "except.h" #include "sprs.h" #include "debug.h" extern int cont_run; /* Reset. It initializes PIC registers. */ void pic_reset() { PRINTF("Resetting PIC.\n"); mtspr(SPR_PICMR, 0); mtspr(SPR_PICPR, 0); mtspr(SPR_PICSR, 0); } /* Simulation hook. Must be called every clock cycle to simulate PIC It does internal functional PIC simulation. */ inline void pic_clock() { /* Don't do anything if interrupts not currently enabled or higher priority exception was allready reported */ if(mfspr(SPR_PICSR) && testsprbits (SPR_SR, SPR_SR_IEE) && !pending.valid) except_handle(EXCEPT_INT, mfspr(SPR_EEAR_BASE)); } /* Asserts interrupt to the PIC. */ void report_interrupt(int line) { setsprbits(SPR_PMR, SPR_PMR_DME, 0); /* Disable doze mode */ setsprbits(SPR_PMR, SPR_PMR_SME, 0); /* Disable sleep mode */ debug(4, "Asserting interrupt %d (%s).\n", line, getsprbit(SPR_PICMR, line) ? "Unmasked" : "Masked"); if (getsprbit(SPR_PICMR, line) || line < 2) setsprbit(SPR_PICSR, line, 1); }
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