1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/*
sat_hw.c - Saturn sound hardware glue/emulation/whatever
supported: main RAM (512 KB)
SCSP + timers
MC68000 CPU
Copyright (c) 2007, R. Belmont and Richard Bannister.
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* 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.
* Neither the names of R. Belmont and Richard Bannister nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#include <stdio.h>
#include "ao.h"
#include "scsp.h"
#include "sat_hw.h"
#include "m68k.h"
#include "m68kcpu.h"
static void scsp_irq(m68ki_cpu_core *cpu, int irq)
{
if (irq > 0)
{
m68k_set_irq(cpu, irq);
}
}
#define MIXER_PAN_LEFT 1
#define MIXER_PAN_RIGHT 2
#define MIXER(level,pan) ((level & 0xff) | ((pan & 0x03) << 8))
#define YM3012_VOL(LVol,LPan,RVol,RPan) (MIXER(LVol,LPan)|(MIXER(RVol,RPan) << 16))
#if 0
static struct SCSPinterface scsp_interface =
{
1,
{ sat_ram, },
{ YM3012_VOL(100, MIXER_PAN_LEFT, 100, MIXER_PAN_RIGHT) },
{ scsp_irq, },
};
#endif
void sat_hw_init(m68ki_cpu_core *cpu)
{
// m68k_init();
m68k_set_cpu_type(cpu, M68K_CPU_TYPE_68000);
m68k_pulse_reset(cpu);
struct SCSPinterface scsp_interface;
scsp_interface.num = 1;
scsp_interface.region[0] = cpu->sat_ram;
scsp_interface.mixing_level[0] = YM3012_VOL(100, MIXER_PAN_LEFT, 100, MIXER_PAN_RIGHT);
scsp_interface.irq_callback[0] = scsp_irq;
scsp_interface.cpu = cpu;
cpu->SCSP = SCSP_Start(&scsp_interface);
}
void sat_hw_free(struct m68ki_cpu_core_s *cpu) {
SCSP_Exit (cpu->SCSP);
}
/* M68k memory handlers */
unsigned int m68k_read_memory_8(m68ki_cpu_core *cpu, unsigned int address)
{
if (address < (512*1024))
return cpu->sat_ram[address^1];
if (address >= 0x100000 && address < 0x100c00)
{
int foo = SCSP_0_r(cpu->SCSP, (address - 0x100000)/2, 0);
if (address & 1)
return foo & 0xff;
else
return foo>>8;
}
printf("R8 @ %x\n", address);
return 0;
}
unsigned int m68k_read_memory_16(m68ki_cpu_core *cpu, unsigned int address)
{
if (address < (512*1024))
{
return mem_readword_swap((unsigned short *)(cpu->sat_ram+address));
}
if (address >= 0x100000 && address < 0x100c00)
return SCSP_0_r(cpu->SCSP, (address-0x100000)/2, 0);
printf("R16 @ %x\n", address);
return 0;
}
unsigned int m68k_read_memory_32(m68ki_cpu_core *cpu, unsigned int address)
{
if (address < 0x80000)
{
return cpu->sat_ram[address+2] | cpu->sat_ram[address+3]<<8 | cpu->sat_ram[address]<<16 | cpu->sat_ram[address+1]<<24;
}
printf("R32 @ %x\n", address);
return 0;
}
void m68k_write_memory_8(m68ki_cpu_core *cpu, unsigned int address, unsigned int data)
{
if (address < 0x80000)
{
cpu->sat_ram[address^1] = data;
return;
}
if (address >= 0x100000 && address < 0x100c00)
{
address -= 0x100000;
if (address & 1)
SCSP_0_w(cpu->SCSP, address>>1, data, 0xff00);
else
SCSP_0_w(cpu->SCSP, address>>1, data<<8, 0x00ff);
return;
}
}
void m68k_write_memory_16(m68ki_cpu_core *cpu, unsigned int address, unsigned int data)
{
if (address < 0x80000)
{
cpu->sat_ram[address+1] = (data>>8)&0xff;
cpu->sat_ram[address] = data&0xff;
return;
}
if (address >= 0x100000 && address < 0x100c00)
{
SCSP_0_w(cpu->SCSP, (address-0x100000)>>1, data, 0x0000);
return;
}
}
void m68k_write_memory_32(m68ki_cpu_core *cpu, unsigned int address, unsigned int data)
{
if (address < 0x80000)
{
cpu->sat_ram[address+1] = (data>>24)&0xff;
cpu->sat_ram[address] = (data>>16)&0xff;
cpu->sat_ram[address+3] = (data>>8)&0xff;
cpu->sat_ram[address+2] = data&0xff;
return;
}
if (address >= 0x100000 && address < 0x100c00)
{
address -= 0x100000;
SCSP_0_w(cpu->SCSP, address>>1, data>>16, 0x0000);
SCSP_0_w(cpu->SCSP, (address>>1)+1, data&0xffff, 0x0000);
return;
}
}
|
