src/devices/dev_pccmos.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_pccmos.c,v 1.7 2005/10/09 22:21:31 debug Exp $
 *  
 *  PC CMOS/RTC device.
 *
 *  The main point of this device is to be a "PC style wrapper" for accessing
 *  the MC146818 (the RTC). In most other respects, this device is bogus, and
 *  just acts as a 256-byte RAM device.
 */

#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_PCCMOS_LENGTH               2
#define PCCMOS_MC146818_FAKE_ADDR       0x1d00000000ULL

struct pccmos_data {
        unsigned char   select;
        unsigned char   ram[256];
};


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

        b = idata = memory_readmax64(cpu, data, len);

        /*
         *  Accesses to CMOS register 0 .. 0xd are rerouted to the
         *  RTC; all other access are treated as CMOS RAM read/writes.
         */

        if ((relative_addr & 1) == 0) {
                if (writeflag == MEM_WRITE) {
                        d->select = idata;
                        if (idata <= 0x0d) {
                                cpu->memory_rw(cpu, cpu->mem,
                                    PCCMOS_MC146818_FAKE_ADDR, &b, 1,
                                    MEM_WRITE, PHYSICAL);
                        }
                } else
                        odata = d->select;
        } else {
                if (d->select <= 0x0d) {
                        if (writeflag == MEM_WRITE) {
                                cpu->memory_rw(cpu, cpu->mem,
                                    PCCMOS_MC146818_FAKE_ADDR + 1, &b, 1,
                                    MEM_WRITE, PHYSICAL);
                        } else {
                                cpu->memory_rw(cpu, cpu->mem,
                                    PCCMOS_MC146818_FAKE_ADDR + 1, &b, 1,
                                    MEM_READ, PHYSICAL);
                                odata = b;
                        }
                } else {
                        if (writeflag == MEM_WRITE)
                                d->ram[d->select] = idata;
                        else
                                odata = d->ram[d->select];
                }
        }

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

        return 1;
}


/*
 *  devinit_pccmos():
 */
int devinit_pccmos(struct devinit *devinit)
{
        struct pccmos_data *d = malloc(sizeof(struct pccmos_data));
        int irq_nr, type = MC146818_PC_CMOS, len = DEV_PCCMOS_LENGTH;

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

        /*
         *  Different machines use different IRQ schemes.
         */
        switch (devinit->machine->machine_type) {
        case MACHINE_CATS:
                irq_nr = 32 + 8;
                type = MC146818_CATS;
                d->ram[0x48] = 20;              /*  century  */
                len = DEV_PCCMOS_LENGTH * 2;
                break;
        case MACHINE_X86:
                irq_nr = 16;    /*  "No" irq  */
                break;
        default:fatal("devinit_pccmos(): unimplemented machine type"
                    " %i\n", devinit->machine->machine_type);
                exit(1);
        }

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

        dev_mc146818_init(devinit->machine, devinit->machine->memory,
            PCCMOS_MC146818_FAKE_ADDR, irq_nr, type, 1);

        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_pccmos.c,v 1.7 2005/10/09 22:21:31 debug Exp $
29	*
30	* PC CMOS/RTC device.
31	*
32	* The main point of this device is to be a "PC style wrapper" for accessing
33	* the MC146818 (the RTC). In most other respects, this device is bogus, and
34	* just acts as a 256-byte RAM device.
35	*/
36
37	#include <stdio.h>
38	#include <stdlib.h>
39	#include <string.h>
40
41	#include "cpu.h"
42	#include "device.h"
43	#include "devices.h"
44	#include "emul.h"
45	#include "machine.h"
46	#include "memory.h"
47	#include "misc.h"
48
49
50	#define DEV_PCCMOS_LENGTH 2
51	#define PCCMOS_MC146818_FAKE_ADDR 0x1d00000000ULL
52
53	struct pccmos_data {
54	unsigned char select;
55	unsigned char ram[256];
56	};
57
58
59	/*
60	* dev_pccmos_access():
61	*/
62	int dev_pccmos_access(struct cpu cpu, struct memory mem,
63	uint64_t relative_addr, unsigned char *data, size_t len,
64	int writeflag, void *extra)
65	{
66	struct pccmos_data d = (struct pccmos_data ) extra;
67	uint64_t idata = 0, odata = 0;
68	unsigned char b;
69
70	b = idata = memory_readmax64(cpu, data, len);
71
72	/*
73	* Accesses to CMOS register 0 .. 0xd are rerouted to the
74	* RTC; all other access are treated as CMOS RAM read/writes.
75	*/
76
77	if ((relative_addr & 1) == 0) {
78	if (writeflag == MEM_WRITE) {
79	d->select = idata;
80	if (idata <= 0x0d) {
81	cpu->memory_rw(cpu, cpu->mem,
82	PCCMOS_MC146818_FAKE_ADDR, &b, 1,
83	MEM_WRITE, PHYSICAL);
84	}
85	} else
86	odata = d->select;
87	} else {
88	if (d->select <= 0x0d) {
89	if (writeflag == MEM_WRITE) {
90	cpu->memory_rw(cpu, cpu->mem,
91	PCCMOS_MC146818_FAKE_ADDR + 1, &b, 1,
92	MEM_WRITE, PHYSICAL);
93	} else {
94	cpu->memory_rw(cpu, cpu->mem,
95	PCCMOS_MC146818_FAKE_ADDR + 1, &b, 1,
96	MEM_READ, PHYSICAL);
97	odata = b;
98	}
99	} else {
100	if (writeflag == MEM_WRITE)
101	d->ram[d->select] = idata;
102	else
103	odata = d->ram[d->select];
104	}
105	}
106
107	if (writeflag == MEM_READ)
108	memory_writemax64(cpu, data, len, odata);
109
110	return 1;
111	}
112
113
114	/*
115	* devinit_pccmos():
116	*/
117	int devinit_pccmos(struct devinit *devinit)
118	{
119	struct pccmos_data *d = malloc(sizeof(struct pccmos_data));
120	int irq_nr, type = MC146818_PC_CMOS, len = DEV_PCCMOS_LENGTH;
121
122	if (d == NULL) {
123	fprintf(stderr, "out of memory\n");
124	exit(1);
125	}
126	memset(d, 0, sizeof(struct pccmos_data));
127
128	/*
129	* Different machines use different IRQ schemes.
130	*/
131	switch (devinit->machine->machine_type) {
132	case MACHINE_CATS:
133	irq_nr = 32 + 8;
134	type = MC146818_CATS;
135	d->ram[0x48] = 20; /* century */
136	len = DEV_PCCMOS_LENGTH * 2;
137	break;
138	case MACHINE_X86:
139	irq_nr = 16; /* "No" irq */
140	break;
141	default:fatal("devinit_pccmos(): unimplemented machine type"
142	" %i\n", devinit->machine->machine_type);
143	exit(1);
144	}
145
146	memory_device_register(devinit->machine->memory, devinit->name,
147	devinit->addr, len, dev_pccmos_access, (void *)d,
148	MEM_DEFAULT, NULL);
149
150	dev_mc146818_init(devinit->machine, devinit->machine->memory,
151	PCCMOS_MC146818_FAKE_ADDR, irq_nr, type, 1);
152
153	return 1;
154	}
155