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- /*
- * PicoDrive
- * (C) notaz, 2009,2010
- *
- * This work is licensed under the terms of MAME license.
- * See COPYING file in the top-level directory.
- */
- #include "../pico_int.h"
- #include "../sound/ym2612.h"
- struct Pico32x Pico32x;
- SH2 sh2s[2];
- static int REGPARM(2) sh2_irq_cb(SH2 *sh2, int level)
- {
- if (sh2->pending_irl > sh2->pending_int_irq) {
- elprintf(EL_32X, "%csh2 ack/irl %d @ %08x",
- sh2->is_slave ? 's' : 'm', level, sh2->pc);
- return 64 + sh2->pending_irl / 2;
- } else {
- elprintf(EL_32X, "%csh2 ack/int %d/%d @ %08x",
- sh2->is_slave ? 's' : 'm', level, sh2->pending_int_vector, sh2->pc);
- sh2->pending_int_irq = 0; // auto-clear
- sh2->pending_level = sh2->pending_irl;
- return sh2->pending_int_vector;
- }
- }
- void p32x_update_irls(int nested_call)
- {
- int irqs, mlvl = 0, slvl = 0;
- // msh2
- irqs = (Pico32x.sh2irqs | Pico32x.sh2irqi[0]) & ((Pico32x.sh2irq_mask[0] << 3) | P32XI_VRES);
- while ((irqs >>= 1))
- mlvl++;
- mlvl *= 2;
- // ssh2
- irqs = (Pico32x.sh2irqs | Pico32x.sh2irqi[1]) & ((Pico32x.sh2irq_mask[1] << 3) | P32XI_VRES);
- while ((irqs >>= 1))
- slvl++;
- slvl *= 2;
- elprintf(EL_32X, "update_irls: m %d, s %d", mlvl, slvl);
- sh2_irl_irq(&msh2, mlvl, nested_call);
- sh2_irl_irq(&ssh2, slvl, nested_call);
- mlvl = mlvl ? 1 : 0;
- slvl = slvl ? 1 : 0;
- p32x_poll_event(mlvl | (slvl << 1), 0);
- }
- void Pico32xStartup(void)
- {
- elprintf(EL_STATUS|EL_32X, "32X startup");
- // TODO: OOM handling
- PicoAHW |= PAHW_32X;
- sh2_init(&msh2, 0);
- msh2.irq_callback = sh2_irq_cb;
- sh2_init(&ssh2, 1);
- ssh2.irq_callback = sh2_irq_cb;
- PicoMemSetup32x();
- if (!Pico.m.pal)
- Pico32x.vdp_regs[0] |= P32XV_nPAL;
- PREG8(Pico32xMem->sh2_peri_regs[0], 4) =
- PREG8(Pico32xMem->sh2_peri_regs[1], 4) = 0x84; // SCI SSR
- emu_32x_startup();
- }
- #define HWSWAP(x) (((x) << 16) | ((x) >> 16))
- void p32x_reset_sh2s(void)
- {
- elprintf(EL_32X, "sh2 reset");
- sh2_reset(&msh2);
- sh2_reset(&ssh2);
- // if we don't have BIOS set, perform it's work here.
- // MSH2
- if (p32x_bios_m == NULL) {
- unsigned int idl_src, idl_dst, idl_size; // initial data load
- unsigned int vbr;
- // initial data
- idl_src = HWSWAP(*(unsigned int *)(Pico.rom + 0x3d4)) & ~0xf0000000;
- idl_dst = HWSWAP(*(unsigned int *)(Pico.rom + 0x3d8)) & ~0xf0000000;
- idl_size= HWSWAP(*(unsigned int *)(Pico.rom + 0x3dc));
- if (idl_size > Pico.romsize || idl_src + idl_size > Pico.romsize ||
- idl_size > 0x40000 || idl_dst + idl_size > 0x40000 || (idl_src & 3) || (idl_dst & 3)) {
- elprintf(EL_STATUS|EL_ANOMALY, "32x: invalid initial data ptrs: %06x -> %06x, %06x",
- idl_src, idl_dst, idl_size);
- }
- else
- memcpy(Pico32xMem->sdram + idl_dst, Pico.rom + idl_src, idl_size);
- // GBR/VBR
- vbr = HWSWAP(*(unsigned int *)(Pico.rom + 0x3e8));
- sh2_set_gbr(0, 0x20004000);
- sh2_set_vbr(0, vbr);
- // checksum and M_OK
- Pico32x.regs[0x28 / 2] = *(unsigned short *)(Pico.rom + 0x18e);
- // program will set M_OK
- }
- // SSH2
- if (p32x_bios_s == NULL) {
- unsigned int vbr;
- // GBR/VBR
- vbr = HWSWAP(*(unsigned int *)(Pico.rom + 0x3ec));
- sh2_set_gbr(1, 0x20004000);
- sh2_set_vbr(1, vbr);
- // program will set S_OK
- }
- }
- void Pico32xInit(void)
- {
- }
- void PicoPower32x(void)
- {
- memset(&Pico32x, 0, sizeof(Pico32x));
- Pico32x.regs[0] = P32XS_REN|P32XS_nRES; // verified
- Pico32x.vdp_regs[0x0a/2] = P32XV_VBLK|P32XV_HBLK|P32XV_PEN;
- Pico32x.sh2_regs[0] = P32XS2_ADEN;
- }
- void PicoUnload32x(void)
- {
- if (Pico32xMem != NULL)
- plat_munmap(Pico32xMem, sizeof(*Pico32xMem));
- Pico32xMem = NULL;
- sh2_finish(&msh2);
- sh2_finish(&ssh2);
- PicoAHW &= ~PAHW_32X;
- }
- void PicoReset32x(void)
- {
- if (PicoAHW & PAHW_32X) {
- Pico32x.sh2irqs |= P32XI_VRES;
- p32x_update_irls(0);
- p32x_poll_event(3, 0);
- }
- }
- static void p32x_start_blank(void)
- {
- if (Pico32xDrawMode != PDM32X_OFF && !PicoSkipFrame) {
- int offs, lines;
- pprof_start(draw);
- offs = 8; lines = 224;
- if ((Pico.video.reg[1] & 8) && !(PicoOpt & POPT_ALT_RENDERER)) {
- offs = 0;
- lines = 240;
- }
- // XXX: no proper handling of 32col mode..
- if ((Pico32x.vdp_regs[0] & P32XV_Mx) != 0 && // 32x not blanking
- (Pico.video.reg[12] & 1) && // 40col mode
- (PicoDrawMask & PDRAW_32X_ON))
- {
- int md_bg = Pico.video.reg[7] & 0x3f;
- // we draw full layer (not line-by-line)
- PicoDraw32xLayer(offs, lines, md_bg);
- }
- else if (Pico32xDrawMode != PDM32X_32X_ONLY)
- PicoDraw32xLayerMdOnly(offs, lines);
- pprof_end(draw);
- }
- // enter vblank
- Pico32x.vdp_regs[0x0a/2] |= P32XV_VBLK|P32XV_PEN;
- // FB swap waits until vblank
- if ((Pico32x.vdp_regs[0x0a/2] ^ Pico32x.pending_fb) & P32XV_FS) {
- Pico32x.vdp_regs[0x0a/2] &= ~P32XV_FS;
- Pico32x.vdp_regs[0x0a/2] |= Pico32x.pending_fb;
- Pico32xSwapDRAM(Pico32x.pending_fb ^ 1);
- }
- Pico32x.sh2irqs |= P32XI_VINT;
- p32x_update_irls(0);
- p32x_poll_event(3, 1);
- }
- static __inline void run_m68k(int cyc)
- {
- pprof_start(m68k);
- p32x_poll_event(3, 0);
- #if defined(EMU_C68K)
- PicoCpuCM68k.cycles = cyc;
- CycloneRun(&PicoCpuCM68k);
- SekCycleCnt += cyc - PicoCpuCM68k.cycles;
- #elif defined(EMU_M68K)
- SekCycleCnt += m68k_execute(cyc);
- #elif defined(EMU_F68K)
- SekCycleCnt += fm68k_emulate(cyc+1, 0, 0);
- #endif
- pprof_end(m68k);
- }
- // ~1463.8, but due to cache misses and slow mem
- // it's much lower than that
- //#define SH2_LINE_CYCLES 735
- #define CYCLES_M68K2MSH2(x) (((x) * p32x_msh2_multiplier) >> 10)
- #define CYCLES_M68K2SSH2(x) (((x) * p32x_ssh2_multiplier) >> 10)
- #define PICO_32X
- #define CPUS_RUN_SIMPLE(m68k_cycles,s68k_cycles) \
- { \
- int slice; \
- SekCycleAim += m68k_cycles; \
- while (SekCycleCnt < SekCycleAim) { \
- slice = SekCycleCnt; \
- run_m68k(SekCycleAim - SekCycleCnt); \
- if (!(Pico32x.regs[0] & P32XS_nRES)) \
- continue; /* SH2s reseting */ \
- slice = SekCycleCnt - slice; /* real count from 68k */ \
- if (SekCycleCnt < SekCycleAim) \
- elprintf(EL_32X, "slice %d", slice); \
- if (!(Pico32x.emu_flags & (P32XF_SSH2POLL|P32XF_SSH2VPOLL))) { \
- pprof_start(ssh2); \
- sh2_execute(&ssh2, CYCLES_M68K2SSH2(slice)); \
- pprof_end(ssh2); \
- } \
- if (!(Pico32x.emu_flags & (P32XF_MSH2POLL|P32XF_MSH2VPOLL))) { \
- pprof_start(msh2); \
- sh2_execute(&msh2, CYCLES_M68K2MSH2(slice)); \
- pprof_end(msh2); \
- } \
- pprof_start(dummy); \
- pprof_end(dummy); \
- } \
- }
- #define STEP_68K 24
- #define CPUS_RUN_LOCKSTEP(m68k_cycles,s68k_cycles) \
- { \
- int i; \
- for (i = 0; i <= (m68k_cycles) - STEP_68K; i += STEP_68K) { \
- run_m68k(STEP_68K); \
- if (!(Pico32x.emu_flags & (P32XF_MSH2POLL|P32XF_MSH2VPOLL))) \
- sh2_execute(&msh2, CYCLES_M68K2SH2(STEP_68K)); \
- if (!(Pico32x.emu_flags & (P32XF_SSH2POLL|P32XF_SSH2VPOLL))) \
- sh2_execute(&ssh2, CYCLES_M68K2SH2(STEP_68K)); \
- } \
- /* last step */ \
- i = (m68k_cycles) - i; \
- run_m68k(i); \
- if (!(Pico32x.emu_flags & (P32XF_MSH2POLL|P32XF_MSH2VPOLL))) \
- sh2_execute(&msh2, CYCLES_M68K2SH2(i)); \
- if (!(Pico32x.emu_flags & (P32XF_SSH2POLL|P32XF_SSH2VPOLL))) \
- sh2_execute(&ssh2, CYCLES_M68K2SH2(i)); \
- }
- #define CPUS_RUN CPUS_RUN_SIMPLE
- //#define CPUS_RUN CPUS_RUN_LOCKSTEP
- #include "../pico_cmn.c"
- void PicoFrame32x(void)
- {
- pwm_frame_smp_cnt = 0;
- Pico32x.vdp_regs[0x0a/2] &= ~P32XV_VBLK; // get out of vblank
- if ((Pico32x.vdp_regs[0] & P32XV_Mx) != 0) // no forced blanking
- Pico32x.vdp_regs[0x0a/2] &= ~P32XV_PEN; // no palette access
- p32x_poll_event(3, 1);
- PicoFrameStart();
- PicoFrameHints();
- elprintf(EL_32X, "poll: %02x", Pico32x.emu_flags);
- }
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