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 1.8 2005/10/26 14:37:04 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 = 0; |
69 |
|
70 |
if (writeflag == MEM_WRITE) |
71 |
b = idata = memory_readmax64(cpu, data, len); |
72 |
|
73 |
/* |
74 |
* Accesses to CMOS register 0 .. 0xd are rerouted to the |
75 |
* RTC; all other access are treated as CMOS RAM read/writes. |
76 |
*/ |
77 |
|
78 |
if ((relative_addr & 1) == 0) { |
79 |
if (writeflag == MEM_WRITE) { |
80 |
d->select = idata; |
81 |
if (idata <= 0x0d) { |
82 |
cpu->memory_rw(cpu, cpu->mem, |
83 |
PCCMOS_MC146818_FAKE_ADDR, &b, 1, |
84 |
MEM_WRITE, PHYSICAL); |
85 |
} |
86 |
} else |
87 |
odata = d->select; |
88 |
} else { |
89 |
if (d->select <= 0x0d) { |
90 |
if (writeflag == MEM_WRITE) { |
91 |
cpu->memory_rw(cpu, cpu->mem, |
92 |
PCCMOS_MC146818_FAKE_ADDR + 1, &b, 1, |
93 |
MEM_WRITE, PHYSICAL); |
94 |
} else { |
95 |
cpu->memory_rw(cpu, cpu->mem, |
96 |
PCCMOS_MC146818_FAKE_ADDR + 1, &b, 1, |
97 |
MEM_READ, PHYSICAL); |
98 |
odata = b; |
99 |
} |
100 |
} else { |
101 |
if (writeflag == MEM_WRITE) |
102 |
d->ram[d->select] = idata; |
103 |
else |
104 |
odata = d->ram[d->select]; |
105 |
} |
106 |
} |
107 |
|
108 |
if (writeflag == MEM_READ) |
109 |
memory_writemax64(cpu, data, len, odata); |
110 |
|
111 |
return 1; |
112 |
} |
113 |
|
114 |
|
115 |
/* |
116 |
* devinit_pccmos(): |
117 |
*/ |
118 |
int devinit_pccmos(struct devinit *devinit) |
119 |
{ |
120 |
struct pccmos_data *d = malloc(sizeof(struct pccmos_data)); |
121 |
int irq_nr, type = MC146818_PC_CMOS, len = DEV_PCCMOS_LENGTH; |
122 |
|
123 |
if (d == NULL) { |
124 |
fprintf(stderr, "out of memory\n"); |
125 |
exit(1); |
126 |
} |
127 |
memset(d, 0, sizeof(struct pccmos_data)); |
128 |
|
129 |
/* |
130 |
* Different machines use different IRQ schemes. |
131 |
*/ |
132 |
switch (devinit->machine->machine_type) { |
133 |
case MACHINE_CATS: |
134 |
irq_nr = 32 + 8; |
135 |
type = MC146818_CATS; |
136 |
d->ram[0x48] = 20; /* century */ |
137 |
len = DEV_PCCMOS_LENGTH * 2; |
138 |
break; |
139 |
case MACHINE_X86: |
140 |
irq_nr = 16; /* "No" irq */ |
141 |
break; |
142 |
default:fatal("devinit_pccmos(): unimplemented machine type" |
143 |
" %i\n", devinit->machine->machine_type); |
144 |
exit(1); |
145 |
} |
146 |
|
147 |
memory_device_register(devinit->machine->memory, devinit->name, |
148 |
devinit->addr, len, dev_pccmos_access, (void *)d, |
149 |
MEM_DEFAULT, NULL); |
150 |
|
151 |
dev_mc146818_init(devinit->machine, devinit->machine->memory, |
152 |
PCCMOS_MC146818_FAKE_ADDR, irq_nr, type, 1); |
153 |
|
154 |
return 1; |
155 |
} |
156 |
|