/[gxemul]/trunk/src/devices/dev_pccmos.c
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Annotation of /trunk/src/devices/dev_pccmos.c

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Revision 16 - (hide annotations)
Mon Oct 8 16:19:01 2007 UTC (12 years, 9 months ago) by dpavlin
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++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.988 2005/10/11 03:53:57 debug Exp $

==============  RELEASE 0.3.6  ==============

20051008	The bug was not because of faulty ARM documentation after all,
		but it was related to those parts of the code.
		Fixing the RTC (dev_mc146818) to work with CATS.
20051009	Rewriting the R() function; now there are 8192 automatically
		generated smaller functions doing the same thing, but hopefully
		faster. This also fixes some bugs which were triggered when
		trying to compile GXemul inside itself. :-)
		Adding a dummy dev_lpt.
20051010	Small hack to not update virtual translation tables if memory
		accesses are done with the NO_EXCEPTION flag; a time reduction
		of almost a factor 2 for a full NetBSD/cats install. :-)
20051011	Passing -A as the default boot arg for CATS (works fine with
		OpenBSD/cats).

==============  RELEASE 0.3.6.1  ==============


1 dpavlin 6 /*
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 dpavlin 16 * $Id: dev_pccmos.c,v 1.7 2005/10/09 22:21:31 debug Exp $
29 dpavlin 6 *
30     * PC CMOS/RTC device.
31     *
32 dpavlin 14 * 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 dpavlin 6 */
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 dpavlin 14 unsigned char b;
69 dpavlin 6
70 dpavlin 14 b = idata = memory_readmax64(cpu, data, len);
71 dpavlin 6
72 dpavlin 14 /*
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 dpavlin 16 if ((relative_addr & 1) == 0) {
78     if (writeflag == MEM_WRITE) {
79 dpavlin 6 d->select = idata;
80 dpavlin 14 if (idata <= 0x0d) {
81 dpavlin 6 cpu->memory_rw(cpu, cpu->mem,
82 dpavlin 14 PCCMOS_MC146818_FAKE_ADDR, &b, 1,
83 dpavlin 6 MEM_WRITE, PHYSICAL);
84 dpavlin 14 }
85 dpavlin 6 } else
86     odata = d->select;
87 dpavlin 16 } else {
88     if (d->select <= 0x0d) {
89 dpavlin 14 if (writeflag == MEM_WRITE) {
90 dpavlin 6 cpu->memory_rw(cpu, cpu->mem,
91 dpavlin 14 PCCMOS_MC146818_FAKE_ADDR + 1, &b, 1,
92 dpavlin 6 MEM_WRITE, PHYSICAL);
93 dpavlin 14 } else {
94 dpavlin 6 cpu->memory_rw(cpu, cpu->mem,
95 dpavlin 14 PCCMOS_MC146818_FAKE_ADDR + 1, &b, 1,
96 dpavlin 6 MEM_READ, PHYSICAL);
97 dpavlin 14 odata = b;
98     }
99 dpavlin 6 } 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 dpavlin 16 int irq_nr, type = MC146818_PC_CMOS, len = DEV_PCCMOS_LENGTH;
121 dpavlin 6
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 dpavlin 14 /*
129     * Different machines use different IRQ schemes.
130     */
131     switch (devinit->machine->machine_type) {
132     case MACHINE_CATS:
133     irq_nr = 32 + 8;
134 dpavlin 16 type = MC146818_CATS;
135     d->ram[0x48] = 20; /* century */
136     len = DEV_PCCMOS_LENGTH * 2;
137 dpavlin 14 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 dpavlin 16 memory_device_register(devinit->machine->memory, devinit->name,
147     devinit->addr, len, dev_pccmos_access, (void *)d,
148     MEM_DEFAULT, NULL);
149    
150 dpavlin 6 dev_mc146818_init(devinit->machine, devinit->machine->memory,
151 dpavlin 16 PCCMOS_MC146818_FAKE_ADDR, irq_nr, type, 1);
152 dpavlin 6
153     return 1;
154     }
155    

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