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some Pico adjustments
[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 {
1e6b5e39 34 case 0x01: d = PicoPicohw.r1; break;
406c96c5 35 case 0x03:
d49b10c2 36 d = PicoPad[0]&0x1f; // d-pad
37 d |= (PicoPad[0]&0x20) << 2; // red button -> C
406c96c5 38 d = ~d;
39 break;
40
213c16ad 41 case 0x05: d = (PicoPicohw.pen_pos[0] >> 8); break; // what is MS bit for? Games read it..
42 case 0x07: d = PicoPicohw.pen_pos[0] & 0xff; break;
43 case 0x09: d = (PicoPicohw.pen_pos[1] >> 8); break;
44 case 0x0b: d = PicoPicohw.pen_pos[1] & 0xff; break;
d49b10c2 45 case 0x0d: d = (1 << (PicoPicohw.page & 7)) - 1; break;
213c16ad 46 case 0x12: d = PicoPicohw.fifo_bytes == 0 ? 0x80 : 0; break; // guess
406c96c5 47 default:
48 elprintf(EL_UIO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
49 break;
50 }
51 }
52
fa22af4c 53 //elprintf(EL_UIO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
9037e45d 54
55end:
56 elprintf(EL_IO, "r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
57 return d;
58}
59
60static u32 PicoReadPico16(u32 a)
61{
62 u32 d=0;
63
64 if ((a&0xe00000)==0xe00000) { d=*(u16 *)(Pico.ram+(a&0xfffe)); goto end; } // Ram
65
66 a&=0xfffffe;
67
68 if (a<Pico.romsize) { d = *(u16 *)(Pico.rom+a); goto end; } // Rom
69
d49b10c2 70 if ((a&0xfffff0)==0xc00000) {
9037e45d 71 d = PicoVideoRead(a);
72 goto end;
73 }
74
213c16ad 75 if (a == 0x800010)
d49b10c2 76 d = (PicoPicohw.fifo_bytes > 0x3f) ? 0 : (0x3f - PicoPicohw.fifo_bytes);
213c16ad 77 else if (a == 0x800012)
78 d = PicoPicohw.fifo_bytes == 0 ? 0x8000 : 0; // guess
fa22af4c 79 else
80 elprintf(EL_UIO, "r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
406c96c5 81
fa22af4c 82 //elprintf(EL_UIO, "r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
9037e45d 83
84end:
406c96c5 85 elprintf(EL_IO, "r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
9037e45d 86 return d;
87}
88
89static u32 PicoReadPico32(u32 a)
90{
91 u32 d=0;
92
93 if ((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); d = (pm[0]<<16)|pm[1]; goto end; } // Ram
94
95 a&=0xfffffe;
96
97 if (a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+a); d = (pm[0]<<16)|pm[1]; goto end; } // Rom
98
d49b10c2 99 if ((a&0xfffff0)==0xc00000) {
9037e45d 100 d = (PicoVideoRead(a)<<16)|PicoVideoRead(a+2);
101 goto end;
102 }
103
104 elprintf(EL_UIO, "r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
105
106end:
107 elprintf(EL_IO, "r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
108 return d;
109}
110
111// -----------------------------------------------------------------
112// Write Ram
113
fa22af4c 114/*
406c96c5 115void dump(u16 w)
116{
fa22af4c 117 static FILE *f[0x10] = { NULL, };
118 char fname[32];
119 int num = PicoPicohw.r12 & 0xf;
120
121 sprintf(fname, "ldump%i.bin", num);
122 if (f[num] == NULL)
123 f[num] = fopen(fname, "wb");
124 fwrite(&w, 1, 2, f[num]);
125 //fclose(f);
406c96c5 126}
fa22af4c 127*/
406c96c5 128
9037e45d 129static void PicoWritePico8(u32 a,u8 d)
130{
131 elprintf(EL_IO, "w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
132
133 if ((a&0xe00000)==0xe00000) { *(u8 *)(Pico.ram+((a^1)&0xffff))=d; return; } // Ram
134
135 a&=0xffffff;
d49b10c2 136 if ((a&0xfffff9)==0xc00011) { if (PicoOpt&2) SN76496Write(d); return; } // PSG Sound
137
138 if ((a&0xfffff0)==0xc00000) { // VDP
9037e45d 139 d&=0xff;
140 PicoVideoWrite(a,(u16)(d|(d<<8))); // Byte access gets mirrored
141 return;
142 }
143
fa22af4c 144 switch (a & 0x1f) {
145 case 0x19: case 0x1b: case 0x1d: case 0x1f: break; // 'S' 'E' 'G' 'A'
146 default:
147 elprintf(EL_UIO, "w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
148 break;
149 }
150 //elprintf(EL_UIO, "w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
9037e45d 151}
152
153static void PicoWritePico16(u32 a,u16 d)
154{
155 elprintf(EL_IO, "w16: %06x, %04x", a&0xffffff, d);
156
157 if ((a&0xe00000)==0xe00000) { *(u16 *)(Pico.ram+(a&0xfffe))=d; return; } // Ram
158
159 a&=0xfffffe;
d49b10c2 160 if ((a&0xfffff0)==0xc00000) { PicoVideoWrite(a,(u16)d); return; } // VDP
9037e45d 161
406c96c5 162// if (a == 0x800010) dump(d);
ef4eb506 163 if (a == 0x800010)
164 {
165 PicoPicohw.fifo_bytes += 2;
166
167 if (PicoPicohw.xpcm_ptr < PicoPicohw.xpcm_buffer + XPCM_BUFFER_SIZE) {
168 *PicoPicohw.xpcm_ptr++ = d >> 8;
169 *PicoPicohw.xpcm_ptr++ = d;
170 }
171 else if (PicoPicohw.xpcm_ptr == PicoPicohw.xpcm_buffer + XPCM_BUFFER_SIZE) {
fa22af4c 172 elprintf(EL_ANOMALY|EL_PICOHW, "xpcm_buffer overflow!");
ef4eb506 173 PicoPicohw.xpcm_ptr++;
174 }
175 }
213c16ad 176 else if (a == 0x800012) {
177 int r12_old = PicoPicohw.r12;
178 PicoPicohw.r12 = d;
179 if (r12_old != d)
180 PicoReratePico();
181 }
fa22af4c 182 else
183 elprintf(EL_UIO, "w16: %06x, %04x", a&0xffffff, d);
406c96c5 184
fa22af4c 185 //elprintf(EL_UIO, "w16: %06x, %04x", a&0xffffff, d);
9037e45d 186}
187
188static void PicoWritePico32(u32 a,u32 d)
189{
190 elprintf(EL_IO, "w32: %06x, %08x", a&0xffffff, d);
191
192 if ((a&0xe00000)==0xe00000)
193 {
194 // Ram:
195 u16 *pm=(u16 *)(Pico.ram+(a&0xfffe));
196 pm[0]=(u16)(d>>16); pm[1]=(u16)d;
197 return;
198 }
199
200 a&=0xfffffe;
d49b10c2 201 if ((a&0xfffff0)==0xc00000)
9037e45d 202 {
203 // VDP:
204 PicoVideoWrite(a, (u16)(d>>16));
205 PicoVideoWrite(a+2,(u16)d);
206 return;
207 }
208
209 elprintf(EL_UIO, "w32: %06x, %08x", a&0xffffff, d);
210}
211
212#ifdef EMU_M68K
213extern unsigned int (*pm68k_read_memory_8) (unsigned int address);
214extern unsigned int (*pm68k_read_memory_16)(unsigned int address);
215extern unsigned int (*pm68k_read_memory_32)(unsigned int address);
216extern void (*pm68k_write_memory_8) (unsigned int address, unsigned char value);
217extern void (*pm68k_write_memory_16)(unsigned int address, unsigned short value);
218extern void (*pm68k_write_memory_32)(unsigned int address, unsigned int value);
219extern unsigned int (*pm68k_read_memory_pcr_8) (unsigned int address);
220extern unsigned int (*pm68k_read_memory_pcr_16)(unsigned int address);
221extern unsigned int (*pm68k_read_memory_pcr_32)(unsigned int address);
222
223static unsigned int m68k_read_memory_pcrp_8(unsigned int a)
224{
225 if((a&0xe00000)==0xe00000) return *(u8 *)(Pico.ram+((a^1)&0xffff)); // Ram
226 return 0;
227}
228
229static unsigned int m68k_read_memory_pcrp_16(unsigned int a)
230{
231 if((a&0xe00000)==0xe00000) return *(u16 *)(Pico.ram+(a&0xfffe)); // Ram
232 return 0;
233}
234
235static unsigned int m68k_read_memory_pcrp_32(unsigned int a)
236{
237 if((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); return (pm[0]<<16)|pm[1]; } // Ram
238 return 0;
239}
240#endif // EMU_M68K
241
242
243PICO_INTERNAL void PicoMemSetupPico(void)
244{
406c96c5 245#ifdef EMU_C68K
246 PicoCpuCM68k.checkpc=PicoCheckPc;
247 PicoCpuCM68k.fetch8 =PicoCpuCM68k.read8 =PicoReadPico8;
248 PicoCpuCM68k.fetch16=PicoCpuCM68k.read16=PicoReadPico16;
249 PicoCpuCM68k.fetch32=PicoCpuCM68k.read32=PicoReadPico32;
250 PicoCpuCM68k.write8 =PicoWritePico8;
251 PicoCpuCM68k.write16=PicoWritePico16;
252 PicoCpuCM68k.write32=PicoWritePico32;
253#endif
9037e45d 254#ifdef EMU_M68K
255 pm68k_read_memory_8 = PicoReadPico8;
256 pm68k_read_memory_16 = PicoReadPico16;
257 pm68k_read_memory_32 = PicoReadPico32;
258 pm68k_write_memory_8 = PicoWritePico8;
259 pm68k_write_memory_16 = PicoWritePico16;
260 pm68k_write_memory_32 = PicoWritePico32;
261 pm68k_read_memory_pcr_8 = m68k_read_memory_pcrp_8;
262 pm68k_read_memory_pcr_16 = m68k_read_memory_pcrp_16;
263 pm68k_read_memory_pcr_32 = m68k_read_memory_pcrp_32;
264#endif
265}
266
fast MegaDrive/MegaCD/32X emulator