cff531af |
1 | /* |
2 | * PicoDrive |
6a98f03e |
3 | * (C) notaz, 2009,2010,2013 |
cff531af |
4 | * |
5 | * This work is licensed under the terms of MAME license. |
6 | * See COPYING file in the top-level directory. |
7 | */ |
be2c4208 |
8 | #include "../pico_int.h" |
974fdb5b |
9 | #include "../sound/ym2612.h" |
be2c4208 |
10 | |
11 | struct Pico32x Pico32x; |
83ff19ec |
12 | SH2 sh2s[2]; |
be2c4208 |
13 | |
e05b81fc |
14 | static int REGPARM(2) sh2_irq_cb(SH2 *sh2, int level) |
4ea707e1 |
15 | { |
e05b81fc |
16 | if (sh2->pending_irl > sh2->pending_int_irq) { |
17 | elprintf(EL_32X, "%csh2 ack/irl %d @ %08x", |
18 | sh2->is_slave ? 's' : 'm', level, sh2->pc); |
19 | return 64 + sh2->pending_irl / 2; |
20 | } else { |
21 | elprintf(EL_32X, "%csh2 ack/int %d/%d @ %08x", |
22 | sh2->is_slave ? 's' : 'm', level, sh2->pending_int_vector, sh2->pc); |
23 | sh2->pending_int_irq = 0; // auto-clear |
24 | sh2->pending_level = sh2->pending_irl; |
25 | return sh2->pending_int_vector; |
26 | } |
4ea707e1 |
27 | } |
28 | |
a8fd6e37 |
29 | // if !nested_call, must sync CPUs before calling this |
1f1ff763 |
30 | void p32x_update_irls(int nested_call) |
4ea707e1 |
31 | { |
32 | int irqs, mlvl = 0, slvl = 0; |
a8fd6e37 |
33 | int mrun, srun; |
4ea707e1 |
34 | |
35 | // msh2 |
36 | irqs = (Pico32x.sh2irqs | Pico32x.sh2irqi[0]) & ((Pico32x.sh2irq_mask[0] << 3) | P32XI_VRES); |
37 | while ((irqs >>= 1)) |
38 | mlvl++; |
39 | mlvl *= 2; |
40 | |
41 | // ssh2 |
42 | irqs = (Pico32x.sh2irqs | Pico32x.sh2irqi[1]) & ((Pico32x.sh2irq_mask[1] << 3) | P32XI_VRES); |
43 | while ((irqs >>= 1)) |
44 | slvl++; |
45 | slvl *= 2; |
46 | |
a8fd6e37 |
47 | mrun = sh2_irl_irq(&msh2, mlvl, nested_call); |
48 | srun = sh2_irl_irq(&ssh2, slvl, nested_call); |
49 | p32x_poll_event(mrun | (srun << 1), 0); |
50 | elprintf(EL_32X, "update_irls: m %d/%d, s %d/%d", mlvl, mrun, slvl, srun); |
4ea707e1 |
51 | } |
52 | |
be2c4208 |
53 | void Pico32xStartup(void) |
54 | { |
55 | elprintf(EL_STATUS|EL_32X, "32X startup"); |
56 | |
679af8a3 |
57 | // TODO: OOM handling |
be2c4208 |
58 | PicoAHW |= PAHW_32X; |
b78efee2 |
59 | sh2_init(&msh2, 0); |
4ea707e1 |
60 | msh2.irq_callback = sh2_irq_cb; |
b78efee2 |
61 | sh2_init(&ssh2, 1); |
4ea707e1 |
62 | ssh2.irq_callback = sh2_irq_cb; |
83ff19ec |
63 | |
64 | PicoMemSetup32x(); |
a8fd6e37 |
65 | p32x_timers_recalc(); |
acd35d4c |
66 | |
be2c4208 |
67 | if (!Pico.m.pal) |
974fdb5b |
68 | Pico32x.vdp_regs[0] |= P32XV_nPAL; |
be2c4208 |
69 | |
1d7a28a7 |
70 | PREG8(Pico32xMem->sh2_peri_regs[0], 4) = |
71 | PREG8(Pico32xMem->sh2_peri_regs[1], 4) = 0x84; // SCI SSR |
72 | |
2446536b |
73 | rendstatus_old = -1; |
74 | |
974fdb5b |
75 | emu_32x_startup(); |
be2c4208 |
76 | } |
77 | |
83ff19ec |
78 | #define HWSWAP(x) (((x) << 16) | ((x) >> 16)) |
79 | void p32x_reset_sh2s(void) |
80 | { |
81 | elprintf(EL_32X, "sh2 reset"); |
82 | |
83 | sh2_reset(&msh2); |
84 | sh2_reset(&ssh2); |
85 | |
86 | // if we don't have BIOS set, perform it's work here. |
87 | // MSH2 |
88 | if (p32x_bios_m == NULL) { |
89 | unsigned int idl_src, idl_dst, idl_size; // initial data load |
90 | unsigned int vbr; |
91 | |
92 | // initial data |
93 | idl_src = HWSWAP(*(unsigned int *)(Pico.rom + 0x3d4)) & ~0xf0000000; |
94 | idl_dst = HWSWAP(*(unsigned int *)(Pico.rom + 0x3d8)) & ~0xf0000000; |
95 | idl_size= HWSWAP(*(unsigned int *)(Pico.rom + 0x3dc)); |
96 | if (idl_size > Pico.romsize || idl_src + idl_size > Pico.romsize || |
97 | idl_size > 0x40000 || idl_dst + idl_size > 0x40000 || (idl_src & 3) || (idl_dst & 3)) { |
98 | elprintf(EL_STATUS|EL_ANOMALY, "32x: invalid initial data ptrs: %06x -> %06x, %06x", |
99 | idl_src, idl_dst, idl_size); |
100 | } |
101 | else |
102 | memcpy(Pico32xMem->sdram + idl_dst, Pico.rom + idl_src, idl_size); |
103 | |
104 | // GBR/VBR |
105 | vbr = HWSWAP(*(unsigned int *)(Pico.rom + 0x3e8)); |
106 | sh2_set_gbr(0, 0x20004000); |
107 | sh2_set_vbr(0, vbr); |
108 | |
109 | // checksum and M_OK |
110 | Pico32x.regs[0x28 / 2] = *(unsigned short *)(Pico.rom + 0x18e); |
111 | // program will set M_OK |
112 | } |
113 | |
114 | // SSH2 |
115 | if (p32x_bios_s == NULL) { |
116 | unsigned int vbr; |
117 | |
118 | // GBR/VBR |
119 | vbr = HWSWAP(*(unsigned int *)(Pico.rom + 0x3ec)); |
120 | sh2_set_gbr(1, 0x20004000); |
121 | sh2_set_vbr(1, vbr); |
122 | // program will set S_OK |
123 | } |
ed4402a7 |
124 | |
125 | msh2.m68krcycles_done = ssh2.m68krcycles_done = SekCyclesDoneT(); |
83ff19ec |
126 | } |
127 | |
be2c4208 |
128 | void Pico32xInit(void) |
129 | { |
ed4402a7 |
130 | if (msh2.mult_m68k_to_sh2 == 0 || msh2.mult_sh2_to_m68k == 0) |
131 | Pico32xSetClocks(PICO_MSH2_HZ, 0); |
132 | if (ssh2.mult_m68k_to_sh2 == 0 || ssh2.mult_sh2_to_m68k == 0) |
133 | Pico32xSetClocks(0, PICO_MSH2_HZ); |
974fdb5b |
134 | } |
135 | |
136 | void PicoPower32x(void) |
137 | { |
138 | memset(&Pico32x, 0, sizeof(Pico32x)); |
5e49c3a8 |
139 | |
83ff19ec |
140 | Pico32x.regs[0] = P32XS_REN|P32XS_nRES; // verified |
974fdb5b |
141 | Pico32x.vdp_regs[0x0a/2] = P32XV_VBLK|P32XV_HBLK|P32XV_PEN; |
87accdf7 |
142 | Pico32x.sh2_regs[0] = P32XS2_ADEN; |
be2c4208 |
143 | } |
144 | |
5e49c3a8 |
145 | void PicoUnload32x(void) |
146 | { |
147 | if (Pico32xMem != NULL) |
b081408f |
148 | plat_munmap(Pico32xMem, sizeof(*Pico32xMem)); |
5e49c3a8 |
149 | Pico32xMem = NULL; |
e898de13 |
150 | sh2_finish(&msh2); |
151 | sh2_finish(&ssh2); |
5e49c3a8 |
152 | |
153 | PicoAHW &= ~PAHW_32X; |
154 | } |
155 | |
be2c4208 |
156 | void PicoReset32x(void) |
157 | { |
83ff19ec |
158 | if (PicoAHW & PAHW_32X) { |
159 | Pico32x.sh2irqs |= P32XI_VRES; |
1f1ff763 |
160 | p32x_update_irls(0); |
83ff19ec |
161 | p32x_poll_event(3, 0); |
a8fd6e37 |
162 | p32x_timers_recalc(); |
83ff19ec |
163 | } |
be2c4208 |
164 | } |
165 | |
974fdb5b |
166 | static void p32x_start_blank(void) |
167 | { |
7a961c19 |
168 | if (Pico32xDrawMode != PDM32X_OFF && !PicoSkipFrame) { |
5aec752d |
169 | int offs, lines; |
170 | |
171 | pprof_start(draw); |
172 | |
173 | offs = 8; lines = 224; |
7a961c19 |
174 | if ((Pico.video.reg[1] & 8) && !(PicoOpt & POPT_ALT_RENDERER)) { |
175 | offs = 0; |
176 | lines = 240; |
177 | } |
178 | |
179 | // XXX: no proper handling of 32col mode.. |
5a681086 |
180 | if ((Pico32x.vdp_regs[0] & P32XV_Mx) != 0 && // 32x not blanking |
181 | (Pico.video.reg[12] & 1) && // 40col mode |
182 | (PicoDrawMask & PDRAW_32X_ON)) |
183 | { |
184 | int md_bg = Pico.video.reg[7] & 0x3f; |
5a681086 |
185 | |
186 | // we draw full layer (not line-by-line) |
187 | PicoDraw32xLayer(offs, lines, md_bg); |
188 | } |
7a961c19 |
189 | else if (Pico32xDrawMode != PDM32X_32X_ONLY) |
190 | PicoDraw32xLayerMdOnly(offs, lines); |
5aec752d |
191 | |
192 | pprof_end(draw); |
5a681086 |
193 | } |
194 | |
974fdb5b |
195 | // enter vblank |
196 | Pico32x.vdp_regs[0x0a/2] |= P32XV_VBLK|P32XV_PEN; |
197 | |
4ea707e1 |
198 | // FB swap waits until vblank |
974fdb5b |
199 | if ((Pico32x.vdp_regs[0x0a/2] ^ Pico32x.pending_fb) & P32XV_FS) { |
200 | Pico32x.vdp_regs[0x0a/2] &= ~P32XV_FS; |
201 | Pico32x.vdp_regs[0x0a/2] |= Pico32x.pending_fb; |
202 | Pico32xSwapDRAM(Pico32x.pending_fb ^ 1); |
203 | } |
4ea707e1 |
204 | |
97d3f47f |
205 | Pico32x.sh2irqs |= P32XI_VINT; |
1f1ff763 |
206 | p32x_update_irls(0); |
87accdf7 |
207 | p32x_poll_event(3, 1); |
974fdb5b |
208 | } |
209 | |
a8fd6e37 |
210 | /* events */ |
211 | static void pwm_irq_event(unsigned int now) |
212 | { |
213 | Pico32x.emu_flags &= ~P32XF_PWM_PEND; |
214 | p32x_pwm_schedule(now); |
215 | |
216 | Pico32x.sh2irqs |= P32XI_PWM; |
217 | p32x_update_irls(0); |
218 | } |
219 | |
220 | static void fillend_event(unsigned int now) |
221 | { |
222 | Pico32x.vdp_regs[0x0a/2] &= ~P32XV_nFEN; |
223 | p32x_poll_event(3, 1); |
224 | } |
225 | |
226 | typedef void (event_cb)(unsigned int now); |
227 | |
6a98f03e |
228 | unsigned int event_times[P32X_EVENT_COUNT]; |
a8fd6e37 |
229 | static unsigned int event_time_next; |
230 | static event_cb *event_cbs[] = { |
231 | [P32X_EVENT_PWM] = pwm_irq_event, |
232 | [P32X_EVENT_FILLEND] = fillend_event, |
233 | }; |
234 | |
235 | // schedule event at some time (in m68k clocks) |
236 | void p32x_event_schedule(enum p32x_event event, unsigned int now, int after) |
237 | { |
238 | unsigned int when = (now + after) | 1; |
239 | |
240 | elprintf(EL_32X, "new event #%u %u->%u", event, now, when); |
241 | event_times[event] = when; |
242 | |
243 | if (event_time_next == 0 || (int)(event_time_next - now) > after) |
244 | event_time_next = when; |
245 | } |
246 | |
247 | static void run_events(unsigned int until) |
248 | { |
249 | int oldest, oldest_diff, time; |
250 | int i, diff; |
251 | |
252 | while (1) { |
253 | oldest = -1, oldest_diff = 0x7fffffff; |
254 | |
255 | for (i = 0; i < P32X_EVENT_COUNT; i++) { |
256 | if (event_times[i]) { |
257 | diff = event_times[i] - until; |
258 | if (diff < oldest_diff) { |
259 | oldest_diff = diff; |
260 | oldest = i; |
261 | } |
262 | } |
263 | } |
264 | |
265 | if (oldest_diff <= 0) { |
266 | time = event_times[oldest]; |
267 | event_times[oldest] = 0; |
268 | elprintf(EL_32X, "run event #%d %u", oldest, time); |
269 | event_cbs[oldest](time); |
270 | } |
271 | else if (oldest_diff < 0x7fffffff) { |
272 | event_time_next = event_times[oldest]; |
273 | break; |
274 | } |
275 | else { |
276 | event_time_next = 0; |
277 | break; |
278 | } |
279 | } |
280 | |
281 | if (oldest != -1) |
282 | elprintf(EL_32X, "next event #%d at %u", oldest, event_time_next); |
283 | } |
284 | |
285 | // compare cycles, handling overflows |
286 | // check if a > b |
287 | #define CYCLES_GT(a, b) \ |
288 | ((int)((a) - (b)) > 0) |
289 | // check if a >= b |
290 | #define CYCLES_GE(a, b) \ |
291 | ((int)((a) - (b)) >= 0) |
292 | |
ed4402a7 |
293 | #define sync_sh2s_normal p32x_sync_sh2s |
294 | //#define sync_sh2s_lockstep p32x_sync_sh2s |
974fdb5b |
295 | |
a8fd6e37 |
296 | /* most timing is in 68k clock */ |
ed4402a7 |
297 | void sync_sh2s_normal(unsigned int m68k_target) |
298 | { |
a8fd6e37 |
299 | unsigned int now, target, timer_cycles; |
300 | int cycles, done; |
ed4402a7 |
301 | |
a8fd6e37 |
302 | elprintf(EL_32X, "sh2 sync to %u", m68k_target); |
ed4402a7 |
303 | |
304 | if (!(Pico32x.regs[0] & P32XS_nRES)) |
305 | return; // rare |
306 | |
a8fd6e37 |
307 | now = msh2.m68krcycles_done; |
308 | if (CYCLES_GT(now, ssh2.m68krcycles_done)) |
309 | now = ssh2.m68krcycles_done; |
310 | timer_cycles = now; |
311 | |
312 | while (CYCLES_GT(m68k_target, now)) |
ed4402a7 |
313 | { |
a8fd6e37 |
314 | if (event_time_next && CYCLES_GE(now, event_time_next)) |
315 | run_events(now); |
ed4402a7 |
316 | |
a8fd6e37 |
317 | target = m68k_target; |
318 | if (event_time_next && CYCLES_GT(target, event_time_next)) |
319 | target = event_time_next; |
320 | |
321 | while (CYCLES_GT(target, now)) |
322 | { |
323 | elprintf(EL_32X, "sh2 exec to %u %d,%d/%d, flags %x", target, |
324 | target - msh2.m68krcycles_done, target - ssh2.m68krcycles_done, |
325 | m68k_target - now, Pico32x.emu_flags); |
ed4402a7 |
326 | |
327 | if (Pico32x.emu_flags & (P32XF_SSH2POLL|P32XF_SSH2VPOLL)) { |
328 | ssh2.m68krcycles_done = target; |
ed4402a7 |
329 | } |
a8fd6e37 |
330 | else { |
331 | cycles = target - ssh2.m68krcycles_done; |
332 | if (cycles > 0) { |
333 | done = sh2_execute(&ssh2, C_M68K_TO_SH2(ssh2, cycles)); |
334 | ssh2.m68krcycles_done += C_SH2_TO_M68K(ssh2, done); |
335 | |
336 | if (event_time_next && CYCLES_GT(target, event_time_next)) |
337 | target = event_time_next; |
338 | } |
ed4402a7 |
339 | } |
340 | |
341 | if (Pico32x.emu_flags & (P32XF_MSH2POLL|P32XF_MSH2VPOLL)) { |
342 | msh2.m68krcycles_done = target; |
ed4402a7 |
343 | } |
a8fd6e37 |
344 | else { |
345 | cycles = target - msh2.m68krcycles_done; |
346 | if (cycles > 0) { |
347 | done = sh2_execute(&msh2, C_M68K_TO_SH2(msh2, cycles)); |
348 | msh2.m68krcycles_done += C_SH2_TO_M68K(msh2, done); |
349 | |
350 | if (event_time_next && CYCLES_GT(target, event_time_next)) |
351 | target = event_time_next; |
352 | } |
ed4402a7 |
353 | } |
a8fd6e37 |
354 | |
355 | now = msh2.m68krcycles_done; |
356 | if (CYCLES_GT(now, ssh2.m68krcycles_done)) |
357 | now = ssh2.m68krcycles_done; |
ed4402a7 |
358 | } |
a8fd6e37 |
359 | |
360 | p32x_timers_do(now - timer_cycles); |
361 | timer_cycles = now; |
ed4402a7 |
362 | } |
236990cf |
363 | } |
acd35d4c |
364 | |
c987bb5c |
365 | #define STEP_68K 24 |
ed4402a7 |
366 | |
367 | void sync_sh2s_lockstep(unsigned int m68k_target) |
368 | { |
369 | unsigned int mcycles; |
370 | |
371 | mcycles = msh2.m68krcycles_done; |
372 | if (ssh2.m68krcycles_done < mcycles) |
373 | mcycles = ssh2.m68krcycles_done; |
374 | |
375 | while (mcycles < m68k_target) { |
376 | mcycles += STEP_68K; |
377 | sync_sh2s_normal(mcycles); |
378 | } |
87accdf7 |
379 | } |
380 | |
ed4402a7 |
381 | #define CPUS_RUN(m68k_cycles,s68k_cycles) do { \ |
382 | SekRunM68k(m68k_cycles); \ |
a8fd6e37 |
383 | if (Pico32x.emu_flags & P32XF_68KPOLL) \ |
ed4402a7 |
384 | p32x_sync_sh2s(SekCycleCntT + SekCycleCnt); \ |
385 | } while (0) |
87accdf7 |
386 | |
ed4402a7 |
387 | #define PICO_32X |
974fdb5b |
388 | #include "../pico_cmn.c" |
389 | |
390 | void PicoFrame32x(void) |
391 | { |
4ea707e1 |
392 | Pico32x.vdp_regs[0x0a/2] &= ~P32XV_VBLK; // get out of vblank |
db1d3564 |
393 | if ((Pico32x.vdp_regs[0] & P32XV_Mx) != 0) // no forced blanking |
394 | Pico32x.vdp_regs[0x0a/2] &= ~P32XV_PEN; // no palette access |
4ea707e1 |
395 | |
87accdf7 |
396 | p32x_poll_event(3, 1); |
974fdb5b |
397 | |
398 | PicoFrameStart(); |
399 | PicoFrameHints(); |
be20816c |
400 | elprintf(EL_32X, "poll: %02x", Pico32x.emu_flags); |
974fdb5b |
401 | } |
db1d3564 |
402 | |
ed4402a7 |
403 | // calculate multipliers against 68k clock (7670442) |
404 | // normally * 3, but effectively slower due to high latencies everywhere |
405 | // however using something lower breaks MK2 animations |
406 | void Pico32xSetClocks(int msh2_hz, int ssh2_hz) |
407 | { |
408 | float m68k_clk = (float)(OSC_NTSC / 7); |
409 | if (msh2_hz > 0) { |
410 | msh2.mult_m68k_to_sh2 = (int)((float)msh2_hz * (1 << CYCLE_MULT_SHIFT) / m68k_clk); |
411 | msh2.mult_sh2_to_m68k = (int)(m68k_clk * (1 << CYCLE_MULT_SHIFT) / (float)msh2_hz); |
412 | } |
413 | if (ssh2_hz > 0) { |
414 | ssh2.mult_m68k_to_sh2 = (int)((float)ssh2_hz * (1 << CYCLE_MULT_SHIFT) / m68k_clk); |
415 | ssh2.mult_sh2_to_m68k = (int)(m68k_clk * (1 << CYCLE_MULT_SHIFT) / (float)ssh2_hz); |
416 | } |
417 | } |
418 | |
419 | // vim:shiftwidth=2:ts=2:expandtab |