64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/* MSPDebug - debugging tool for MSP430 MCUs
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* Copyright (C) 2009, 2010 Daniel Beer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef SIMIO_CPU_H_
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#define SIMIO_CPU_H_
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/* This file describes the interface between the CPU simulator and the IO
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* simulator. It gives prototypes for functions which should be periodically
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* called by the CPU simulator.
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*/
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#include <stdint.h>
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#include "util.h"
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/* This function should be called when the CPU is reset, to also reset
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* the IO simulator.
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*/
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void simio_reset(void);
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/* These functions should be called to perform programmed IO requests. A
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* return value of 0 indicates success, 1 is an unhandled request, and -1
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* is an error which should cause execution to stop.
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*/
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int simio_write(address_t addr, uint16_t data);
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int simio_read(address_t addr, uint16_t *data);
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int simio_write_b(address_t addr, uint8_t data);
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int simio_read_b(address_t addr, uint8_t *data);
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/* Check for an interrupt before executing an instruction. It returns -1 if
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* no interrupt is pending, otherwise the number of the highest priority
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* pending interrupt.
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*/
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int simio_check_interrupt(void);
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/* When the CPU begins to handle an interrupt, it needs to notify the IO
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* simulation. Some interrupt flags are cleared automatically when handled.
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*/
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void simio_ack_interrupt(int irq);
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/* This should be called after executing an instruction to advance the system
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* clocks.
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*
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* The status_register value should be the value of SR _before_ the
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* instruction was executed.
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*/
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void simio_step(uint16_t status_register, int cycles);
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#endif
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