notaz.gp2x.de / picodrive.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
some Pico work
[picodrive.git] / Pico / Pico / Memory.c
CommitLineData
9037e45d 1#include "../PicoInt.h"
d49b10c2 2#include "../sound/sn76496.h"
9037e45d 3
4#ifndef UTYPES_DEFINED
5typedef unsigned char u8;
6typedef unsigned short u16;
7typedef unsigned int u32;
8#define UTYPES_DEFINED
9#endif
10
d49b10c2 11
9037e45d 12// -----------------------------------------------------------------
13// Read Rom and read Ram
14
15static u32 PicoReadPico8(u32 a)
16{
17 u32 d=0;
18
19 if ((a&0xe00000)==0xe00000) { d = *(u8 *)(Pico.ram+((a^1)&0xffff)); goto end; } // Ram
20 if (a<Pico.romsize) { d = *(u8 *)(Pico.rom+(a^1)); goto end; } // Rom
21
22 a&=0xffffff;
23
d49b10c2 24 if ((a&0xfffff0)==0xc00000) { // VDP
9037e45d 25 d=PicoVideoRead(a);
26 if ((a&1)==0) d>>=8;
27 goto end;
28 }
29
406c96c5 30 if ((a&0xffffe0)==0x800000) // Pico I/O
31 {
32 switch (a & 0x1f)
33 {
34 case 0x03:
d49b10c2 35 d = PicoPad[0]&0x1f; // d-pad
36 d |= (PicoPad[0]&0x20) << 2; // red button -> C
406c96c5 37 d = ~d;
38 break;
39
d49b10c2 40 case 0x05: d = (PicoPicohw.pen_pos[0] >> 8) & 3; break; // what is MS bit for? Games read it..
41 case 0x07: d = PicoPicohw.pen_pos[0] & 0xff; break;
42 case 0x09: d = (PicoPicohw.pen_pos[1] >> 8) & 3; break;
43 case 0x0b: d = PicoPicohw.pen_pos[1] & 0xff; break;
44 case 0x0d: d = (1 << (PicoPicohw.page & 7)) - 1; break;
406c96c5 45 case 0x12: d = 0x80; break;
46 default:
47 elprintf(EL_UIO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
48 break;
49 }
50 }
51
52// elprintf(EL_UIO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
9037e45d 53
54end:
55 elprintf(EL_IO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
56 return d;
57}
58
59static u32 PicoReadPico16(u32 a)
60{
61 u32 d=0;
62
63 if ((a&0xe00000)==0xe00000) { d=*(u16 *)(Pico.ram+(a&0xfffe)); goto end; } // Ram
64
65 a&=0xfffffe;
66
67 if (a<Pico.romsize) { d = *(u16 *)(Pico.rom+a); goto end; } // Rom
68
d49b10c2 69 if ((a&0xfffff0)==0xc00000) {
9037e45d 70 d = PicoVideoRead(a);
71 goto end;
72 }
73
d49b10c2 74 if (a == 0x800010)
75 d = (PicoPicohw.fifo_bytes > 0x3f) ? 0 : (0x3f - PicoPicohw.fifo_bytes);
406c96c5 76
77 elprintf(EL_UIO, "r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
9037e45d 78
79end:
406c96c5 80 elprintf(EL_IO, "r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
9037e45d 81 return d;
82}
83
84static u32 PicoReadPico32(u32 a)
85{
86 u32 d=0;
87
88 if ((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); d = (pm[0]<<16)|pm[1]; goto end; } // Ram
89
90 a&=0xfffffe;
91
92 if (a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+a); d = (pm[0]<<16)|pm[1]; goto end; } // Rom
93
d49b10c2 94 if ((a&0xfffff0)==0xc00000) {
9037e45d 95 d = (PicoVideoRead(a)<<16)|PicoVideoRead(a+2);
96 goto end;
97 }
98
99 elprintf(EL_UIO, "r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
100
101end:
102 elprintf(EL_IO, "r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
103 return d;
104}
105
106// -----------------------------------------------------------------
107// Write Ram
108
406c96c5 109void dump(u16 w)
110{
111 FILE *f = fopen("dump.bin", "a");
112 fwrite(&w, 1, 2, f);
113 fclose(f);
114}
115
116
9037e45d 117static void PicoWritePico8(u32 a,u8 d)
118{
119 elprintf(EL_IO, "w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
120
121 if ((a&0xe00000)==0xe00000) { *(u8 *)(Pico.ram+((a^1)&0xffff))=d; return; } // Ram
122
123 a&=0xffffff;
d49b10c2 124 if ((a&0xfffff9)==0xc00011) { if (PicoOpt&2) SN76496Write(d); return; } // PSG Sound
125
126 if ((a&0xfffff0)==0xc00000) { // VDP
9037e45d 127 d&=0xff;
128 PicoVideoWrite(a,(u16)(d|(d<<8))); // Byte access gets mirrored
129 return;
130 }
131
132 elprintf(EL_UIO, "w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
133}
134
135static void PicoWritePico16(u32 a,u16 d)
136{
137 elprintf(EL_IO, "w16: %06x, %04x", a&0xffffff, d);
138
139 if ((a&0xe00000)==0xe00000) { *(u16 *)(Pico.ram+(a&0xfffe))=d; return; } // Ram
140
141 a&=0xfffffe;
d49b10c2 142 if ((a&0xfffff0)==0xc00000) { PicoVideoWrite(a,(u16)d); return; } // VDP
9037e45d 143
406c96c5 144// if (a == 0x800010) dump(d);
d49b10c2 145 if (a == 0x800010) PicoPicohw.fifo_bytes += 2;
406c96c5 146
9037e45d 147 elprintf(EL_UIO, "w16: %06x, %04x", a&0xffffff, d);
148}
149
150static void PicoWritePico32(u32 a,u32 d)
151{
152 elprintf(EL_IO, "w32: %06x, %08x", a&0xffffff, d);
153
154 if ((a&0xe00000)==0xe00000)
155 {
156 // Ram:
157 u16 *pm=(u16 *)(Pico.ram+(a&0xfffe));
158 pm[0]=(u16)(d>>16); pm[1]=(u16)d;
159 return;
160 }
161
162 a&=0xfffffe;
d49b10c2 163 if ((a&0xfffff0)==0xc00000)
9037e45d 164 {
165 // VDP:
166 PicoVideoWrite(a, (u16)(d>>16));
167 PicoVideoWrite(a+2,(u16)d);
168 return;
169 }
170
171 elprintf(EL_UIO, "w32: %06x, %08x", a&0xffffff, d);
172}
173
174#ifdef EMU_M68K
175extern unsigned int (*pm68k_read_memory_8) (unsigned int address);
176extern unsigned int (*pm68k_read_memory_16)(unsigned int address);
177extern unsigned int (*pm68k_read_memory_32)(unsigned int address);
178extern void (*pm68k_write_memory_8) (unsigned int address, unsigned char value);
179extern void (*pm68k_write_memory_16)(unsigned int address, unsigned short value);
180extern void (*pm68k_write_memory_32)(unsigned int address, unsigned int value);
181extern unsigned int (*pm68k_read_memory_pcr_8) (unsigned int address);
182extern unsigned int (*pm68k_read_memory_pcr_16)(unsigned int address);
183extern unsigned int (*pm68k_read_memory_pcr_32)(unsigned int address);
184
185static unsigned int m68k_read_memory_pcrp_8(unsigned int a)
186{
187 if((a&0xe00000)==0xe00000) return *(u8 *)(Pico.ram+((a^1)&0xffff)); // Ram
188 return 0;
189}
190
191static unsigned int m68k_read_memory_pcrp_16(unsigned int a)
192{
193 if((a&0xe00000)==0xe00000) return *(u16 *)(Pico.ram+(a&0xfffe)); // Ram
194 return 0;
195}
196
197static unsigned int m68k_read_memory_pcrp_32(unsigned int a)
198{
199 if((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); return (pm[0]<<16)|pm[1]; } // Ram
200 return 0;
201}
202#endif // EMU_M68K
203
204
205PICO_INTERNAL void PicoMemSetupPico(void)
206{
406c96c5 207#ifdef EMU_C68K
208 PicoCpuCM68k.checkpc=PicoCheckPc;
209 PicoCpuCM68k.fetch8 =PicoCpuCM68k.read8 =PicoReadPico8;
210 PicoCpuCM68k.fetch16=PicoCpuCM68k.read16=PicoReadPico16;
211 PicoCpuCM68k.fetch32=PicoCpuCM68k.read32=PicoReadPico32;
212 PicoCpuCM68k.write8 =PicoWritePico8;
213 PicoCpuCM68k.write16=PicoWritePico16;
214 PicoCpuCM68k.write32=PicoWritePico32;
215#endif
9037e45d 216#ifdef EMU_M68K
217 pm68k_read_memory_8 = PicoReadPico8;
218 pm68k_read_memory_16 = PicoReadPico16;
219 pm68k_read_memory_32 = PicoReadPico32;
220 pm68k_write_memory_8 = PicoWritePico8;
221 pm68k_write_memory_16 = PicoWritePico16;
222 pm68k_write_memory_32 = PicoWritePico32;
223 pm68k_read_memory_pcr_8 = m68k_read_memory_pcrp_8;
224 pm68k_read_memory_pcr_16 = m68k_read_memory_pcrp_16;
225 pm68k_read_memory_pcr_32 = m68k_read_memory_pcrp_32;
226#endif
227}
228
fast MegaDrive/MegaCD/32X emulator