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/* |
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* Copyright (C) 2005 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: dev_8253.c,v 1.5 2005/10/26 14:37:03 debug Exp $ |
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* |
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* 8253/8254 Programmable Interval Timer. |
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* |
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* This is mostly bogus. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#include "cpu.h" |
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#include "device.h" |
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#include "devices.h" |
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#include "emul.h" |
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#include "machine.h" |
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#include "memory.h" |
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#include "misc.h" |
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|
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|
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#define DEV_8253_LENGTH 4 |
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#define TICK_SHIFT 14 |
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|
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|
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struct pit8253_data { |
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int irq_nr; |
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int counter_select; |
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}; |
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|
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|
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/* |
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* dev_8253_tick(): |
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*/ |
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void dev_8253_tick(struct cpu *cpu, void *extra) |
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{ |
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struct pit8253_data *d = (struct pit8253_data *) extra; |
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cpu_interrupt(cpu, d->irq_nr); |
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} |
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|
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|
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/* |
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* dev_8253_access(): |
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*/ |
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int dev_8253_access(struct cpu *cpu, struct memory *mem, |
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uint64_t relative_addr, unsigned char *data, size_t len, |
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int writeflag, void *extra) |
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{ |
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struct pit8253_data *d = (struct pit8253_data *) extra; |
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uint64_t idata = 0, odata = 0; |
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|
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if (writeflag == MEM_WRITE) |
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idata = memory_readmax64(cpu, data, len); |
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|
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/* TODO: ack somewhere else */ |
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cpu_interrupt_ack(cpu, d->irq_nr); |
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|
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switch (relative_addr) { |
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case 0x00: |
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if (writeflag == MEM_WRITE) { |
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/* TODO */ |
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} else { |
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/* TODO */ |
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odata = 1; |
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odata = random(); |
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} |
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break; |
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case 0x03: |
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if (writeflag == MEM_WRITE) { |
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d->counter_select = idata >> 6; |
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/* TODO: other bits */ |
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} else { |
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odata = d->counter_select << 6; |
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} |
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break; |
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default: |
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if (writeflag == MEM_WRITE) { |
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fatal("[ 8253: unimplemented write to address 0x%x" |
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" data=0x%02x ]\n", (int)relative_addr, (int)idata); |
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} else { |
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fatal("[ 8253: unimplemented read from address 0x%x " |
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"]\n", (int)relative_addr); |
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} |
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} |
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|
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if (writeflag == MEM_READ) |
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memory_writemax64(cpu, data, len, odata); |
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|
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return 1; |
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} |
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|
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|
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/* |
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* devinit_8253(): |
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*/ |
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int devinit_8253(struct devinit *devinit) |
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{ |
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struct pit8253_data *d = malloc(sizeof(struct pit8253_data)); |
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|
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if (d == NULL) { |
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fprintf(stderr, "out of memory\n"); |
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exit(1); |
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} |
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memset(d, 0, sizeof(struct pit8253_data)); |
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d->irq_nr = devinit->irq_nr; |
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|
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memory_device_register(devinit->machine->memory, devinit->name, |
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devinit->addr, DEV_8253_LENGTH, dev_8253_access, (void *)d, |
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MEM_DEFAULT, NULL); |
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|
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machine_add_tickfunction(devinit->machine, dev_8253_tick, |
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d, TICK_SHIFT); |
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|
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return 1; |
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} |
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|