src/devices/dev_8253.c

/*
 *  Copyright (C) 2005  Anders Gavare.  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright  
 *     notice, this list of conditions and the following disclaimer in the 
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE   
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 *  SUCH DAMAGE.
 *   
 *
 *  $Id: dev_8253.c,v 1.4 2005/05/21 07:41:11 debug Exp $
 *  
 *  8253/8254 Programmable Interval Timer.
 *
 *  This is mostly bogus.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "cpu.h"
#include "device.h"
#include "devices.h"
#include "emul.h"
#include "machine.h"
#include "memory.h"
#include "misc.h"


#define DEV_8253_LENGTH         4
#define TICK_SHIFT              14


struct pit8253_data {
        int             irq_nr;
        int             counter_select;
};


/*
 *  dev_8253_tick():
 */     
void dev_8253_tick(struct cpu *cpu, void *extra)
{
        struct pit8253_data *d = (struct pit8253_data *) extra;
        cpu_interrupt(cpu, d->irq_nr);
}


/*
 *  dev_8253_access():
 */
int dev_8253_access(struct cpu *cpu, struct memory *mem,
        uint64_t relative_addr, unsigned char *data, size_t len,
        int writeflag, void *extra)
{
        struct pit8253_data *d = (struct pit8253_data *) extra;
        uint64_t idata = 0, odata = 0;

        idata = memory_readmax64(cpu, data, len);

        /*  TODO: ack somewhere else  */
        cpu_interrupt_ack(cpu, d->irq_nr);

        switch (relative_addr) {
        case 0x00:
                if (writeflag == MEM_WRITE) {
                        /*  TODO  */
                } else {
                        /*  TODO  */
                        odata = 1;
odata = random();
                }
                break;
        case 0x03:
                if (writeflag == MEM_WRITE) {
                        d->counter_select = idata >> 6;
                        /*  TODO: other bits  */
                } else {
                        odata = d->counter_select << 6;
                }
                break;
        default:
                if (writeflag == MEM_WRITE) {
                        fatal("[ 8253: unimplemented write to address 0x%x"
                            " data=0x%02x ]\n", (int)relative_addr, (int)idata);
                } else {
                        fatal("[ 8253: unimplemented read from address 0x%x "
                            "]\n", (int)relative_addr);
                }
        }

        if (writeflag == MEM_READ)
                memory_writemax64(cpu, data, len, odata);

        return 1;
}


/*
 *  devinit_8253():
 */
int devinit_8253(struct devinit *devinit)
{
        struct pit8253_data *d = malloc(sizeof(struct pit8253_data));

        if (d == NULL) {
                fprintf(stderr, "out of memory\n");
                exit(1);
        }
        memset(d, 0, sizeof(struct pit8253_data));
        d->irq_nr = devinit->irq_nr;

        memory_device_register(devinit->machine->memory, devinit->name,
            devinit->addr, DEV_8253_LENGTH, dev_8253_access, (void *)d,
            MEM_DEFAULT, NULL);

        machine_add_tickfunction(devinit->machine, dev_8253_tick,
            d, TICK_SHIFT);

        return 1;
}

1	/*
2	* Copyright (C) 2005 Anders Gavare. All rights reserved.
3	*
4	* Redistribution and use in source and binary forms, with or without
5	* modification, are permitted provided that the following conditions are met:
6	*
7	* 1. Redistributions of source code must retain the above copyright
8	* notice, this list of conditions and the following disclaimer.
9	* 2. Redistributions in binary form must reproduce the above copyright
10	* notice, this list of conditions and the following disclaimer in the
11	* documentation and/or other materials provided with the distribution.
12	* 3. The name of the author may not be used to endorse or promote products
13	* derived from this software without specific prior written permission.
14	*
15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25	* SUCH DAMAGE.
26	*
27	*
28	* $Id: dev_8253.c,v 1.4 2005/05/21 07:41:11 debug Exp $
29	*
30	* 8253/8254 Programmable Interval Timer.
31	*
32	* This is mostly bogus.
33	*/
34
35	#include <stdio.h>
36	#include <stdlib.h>
37	#include <string.h>
38
39	#include "cpu.h"
40	#include "device.h"
41	#include "devices.h"
42	#include "emul.h"
43	#include "machine.h"
44	#include "memory.h"
45	#include "misc.h"
46
47
48	#define DEV_8253_LENGTH 4
49	#define TICK_SHIFT 14
50
51
52	struct pit8253_data {
53	int irq_nr;
54	int counter_select;
55	};
56
57
58	/*
59	* dev_8253_tick():
60	*/
61	void dev_8253_tick(struct cpu cpu, void extra)
62	{
63	struct pit8253_data d = (struct pit8253_data ) extra;
64	cpu_interrupt(cpu, d->irq_nr);
65	}
66
67
68	/*
69	* dev_8253_access():
70	*/
71	int dev_8253_access(struct cpu cpu, struct memory mem,
72	uint64_t relative_addr, unsigned char *data, size_t len,
73	int writeflag, void *extra)
74	{
75	struct pit8253_data d = (struct pit8253_data ) extra;
76	uint64_t idata = 0, odata = 0;
77
78	idata = memory_readmax64(cpu, data, len);
79
80	/* TODO: ack somewhere else */
81	cpu_interrupt_ack(cpu, d->irq_nr);
82
83	switch (relative_addr) {
84	case 0x00:
85	if (writeflag == MEM_WRITE) {
86	/* TODO */
87	} else {
88	/* TODO */
89	odata = 1;
90	odata = random();
91	}
92	break;
93	case 0x03:
94	if (writeflag == MEM_WRITE) {
95	d->counter_select = idata >> 6;
96	/* TODO: other bits */
97	} else {
98	odata = d->counter_select << 6;
99	}
100	break;
101	default:
102	if (writeflag == MEM_WRITE) {
103	fatal("[ 8253: unimplemented write to address 0x%x"
104	" data=0x%02x ]\n", (int)relative_addr, (int)idata);
105	} else {
106	fatal("[ 8253: unimplemented read from address 0x%x "
107	"]\n", (int)relative_addr);
108	}
109	}
110
111	if (writeflag == MEM_READ)
112	memory_writemax64(cpu, data, len, odata);
113
114	return 1;
115	}
116
117
118	/*
119	* devinit_8253():
120	*/
121	int devinit_8253(struct devinit *devinit)
122	{
123	struct pit8253_data *d = malloc(sizeof(struct pit8253_data));
124
125	if (d == NULL) {
126	fprintf(stderr, "out of memory\n");
127	exit(1);
128	}
129	memset(d, 0, sizeof(struct pit8253_data));
130	d->irq_nr = devinit->irq_nr;
131
132	memory_device_register(devinit->machine->memory, devinit->name,
133	devinit->addr, DEV_8253_LENGTH, dev_8253_access, (void *)d,
134	MEM_DEFAULT, NULL);
135
136	machine_add_tickfunction(devinit->machine, dev_8253_tick,
137	d, TICK_SHIFT);
138
139	return 1;
140	}
141