166 lines
3.5 KiB
C
166 lines
3.5 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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#include <stdlib.h>
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#include <string.h>
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#include "simio_device.h"
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#include "simio_hwmult.h"
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#include "output.h"
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#include "expr.h"
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/* Multiplier register addresses - taken from mspgcc */
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#define MPY 0x0130 /* Multiply Unsigned/Operand 1 */
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#define MPYS 0x0132 /* Multiply Signed/Operand 1 */
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#define MAC 0x0134 /* Multiply Unsigned and Accumulate/Operand 1 */
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#define MACS 0x0136 /* Multiply Signed and Accumulate/Operand 1 */
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#define OP2 0x0138 /* Operand 2 */
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#define RESLO 0x013A /* Result Low Word */
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#define RESHI 0x013C /* Result High Word */
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#define SUMEXT 0x013E /* Sum Extend */
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struct hwmult {
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struct simio_device base;
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int mode;
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uint16_t op1;
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uint16_t op2;
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uint32_t result;
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uint16_t sumext;
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};
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struct simio_device *hwmult_create(char **arg_text)
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{
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struct hwmult *h = malloc(sizeof(*h));
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(void)arg_text;
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if (!h) {
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pr_error("hwmult: can't allocate memory");
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return NULL;
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}
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memset(h, 0, sizeof(*h));
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h->base.type = &simio_hwmult;
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return (struct simio_device *)h;
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}
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static void hwmult_destroy(struct simio_device *dev)
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{
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free(dev);
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}
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static void do_multiply(struct hwmult *h)
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{
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uint32_t im;
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/* Multiply */
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if (h->mode & 2)
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im = (int16_t)h->op1 * (int16_t)h->op2;
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else
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im = h->op1 * h->op2;
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/* Accumulate or store */
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if (h->mode & 4)
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h->result += im;
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else
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h->result = im;
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/* Set SUMEXT */
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if (h->mode & 2)
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h->sumext = (h->result & 0x80000000) ? 0xffff : 0;
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else if (h->mode == MPY)
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h->sumext = (h->result < im) ? 1 : 0;
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else
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h->sumext = 0;
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}
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static int hwmult_write(struct simio_device *dev, address_t addr, uint16_t data)
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{
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struct hwmult *h = (struct hwmult *)dev;
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switch (addr) {
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case RESHI:
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h->result = (h->result & 0xffff) | ((uint32_t)data << 16);
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return 0;
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case RESLO:
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h->result = (h->result & 0xffff0000) | data;
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return 0;
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case OP2:
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h->op2 = data;
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do_multiply(h);
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return 0;
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case MPY:
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case MPYS:
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case MAC:
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case MACS:
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h->op1 = data;
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h->mode = addr;
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return 0;
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}
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return 1;
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}
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static int hwmult_read(struct simio_device *dev, address_t addr, uint16_t *data)
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{
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struct hwmult *h = (struct hwmult *)dev;
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switch (addr) {
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case MPY:
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case MPYS:
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case MAC:
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case MACS:
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*data = h->op1;
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return 0;
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case OP2:
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*data = h->op2;
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return 0;
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case RESLO:
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*data = h->result & 0xffff;
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return 0;
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case RESHI:
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*data = h->result >> 16;
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return 0;
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case SUMEXT:
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*data = h->sumext;
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return 0;
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}
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return 1;
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}
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const struct simio_class simio_hwmult = {
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.name = "hwmult",
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.help =
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"This module simulates the hardware multiplier.\n",
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.create = hwmult_create,
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.destroy = hwmult_destroy,
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.write = hwmult_write,
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.read = hwmult_read
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};
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