mspdebug/simio_cpu.h

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/* MSPDebug - debugging tool for MSP430 MCUs
* Copyright (C) 2009, 2010 Daniel Beer
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef SIMIO_CPU_H_
#define SIMIO_CPU_H_
/* This file describes the interface between the CPU simulator and the IO
* simulator. It gives prototypes for functions which should be periodically
* called by the CPU simulator.
*/
#include <stdint.h>
#include "util.h"
/* This function should be called when the CPU is reset, to also reset
* the IO simulator.
*/
void simio_reset(void);
/* These functions should be called to perform programmed IO requests. A
* return value of 0 indicates success, 1 is an unhandled request, and -1
* is an error which should cause execution to stop.
*/
int simio_write(address_t addr, uint16_t data);
int simio_read(address_t addr, uint16_t *data);
int simio_write_b(address_t addr, uint8_t data);
int simio_read_b(address_t addr, uint8_t *data);
/* Check for an interrupt before executing an instruction. It returns -1 if
* no interrupt is pending, otherwise the number of the highest priority
* pending interrupt.
*/
int simio_check_interrupt(void);
/* When the CPU begins to handle an interrupt, it needs to notify the IO
* simulation. Some interrupt flags are cleared automatically when handled.
*/
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void simio_ack_interrupt(int irq);
/* This should be called after executing an instruction to advance the system
* clocks.
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*
* The status_register value should be the value of SR _before_ the
* instruction was executed.
*/
void simio_step(uint16_t status_register, int cycles);
#endif