mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 07:17:45 -04:00
4ea707e1e3
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@786 be3aeb3a-fb24-0410-a615-afba39da0efa
152 lines
3.2 KiB
C
152 lines
3.2 KiB
C
#include "../pico_int.h"
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#include "../sound/ym2612.h"
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struct Pico32x Pico32x;
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static void sh2_irq_cb(int level)
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{
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// diagnostic for now
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elprintf(EL_32X, "sh2 ack %d @ %08x", level, ash2_pc());
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}
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void p32x_update_irls(void)
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{
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int irqs, mlvl = 0, slvl = 0;
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// msh2
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irqs = (Pico32x.sh2irqs | Pico32x.sh2irqi[0]) & ((Pico32x.sh2irq_mask[0] << 3) | P32XI_VRES);
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while ((irqs >>= 1))
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mlvl++;
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mlvl *= 2;
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// ssh2
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irqs = (Pico32x.sh2irqs | Pico32x.sh2irqi[1]) & ((Pico32x.sh2irq_mask[1] << 3) | P32XI_VRES);
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while ((irqs >>= 1))
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slvl++;
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slvl *= 2;
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elprintf(EL_32X, "update_irls: m %d, s %d", mlvl, slvl);
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sh2_irl_irq(&msh2, mlvl);
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if (mlvl)
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p32x_poll_event(0);
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sh2_irl_irq(&ssh2, slvl);
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}
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void Pico32xStartup(void)
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{
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elprintf(EL_STATUS|EL_32X, "32X startup");
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PicoAHW |= PAHW_32X;
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PicoMemSetup32x();
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sh2_init(&msh2);
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msh2.irq_callback = sh2_irq_cb;
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sh2_reset(&msh2);
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sh2_init(&ssh2);
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ssh2.irq_callback = sh2_irq_cb;
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sh2_reset(&ssh2);
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if (!Pico.m.pal)
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Pico32x.vdp_regs[0] |= P32XV_nPAL;
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emu_32x_startup();
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}
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void Pico32xInit(void)
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{
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}
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void PicoPower32x(void)
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{
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memset(&Pico32x, 0, sizeof(Pico32x));
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Pico32x.regs[0] = 0x0082; // SH2 reset?
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Pico32x.vdp_regs[0x0a/2] = P32XV_VBLK|P32XV_HBLK|P32XV_PEN;
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}
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void PicoUnload32x(void)
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{
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if (Pico32xMem != NULL)
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free(Pico32xMem);
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Pico32xMem = NULL;
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PicoAHW &= ~PAHW_32X;
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}
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void PicoReset32x(void)
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{
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extern int p32x_csum_faked;
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p32x_csum_faked = 0; // tmp
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}
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static void p32x_start_blank(void)
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{
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// enter vblank
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Pico32x.vdp_regs[0x0a/2] |= P32XV_VBLK|P32XV_PEN;
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// FB swap waits until vblank
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if ((Pico32x.vdp_regs[0x0a/2] ^ Pico32x.pending_fb) & P32XV_FS) {
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Pico32x.vdp_regs[0x0a/2] &= ~P32XV_FS;
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Pico32x.vdp_regs[0x0a/2] |= Pico32x.pending_fb;
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Pico32xSwapDRAM(Pico32x.pending_fb ^ 1);
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}
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p32x_poll_event(1);
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}
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// FIXME..
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static __inline void SekRunM68k(int cyc)
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{
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int cyc_do;
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SekCycleAim += cyc;
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if (Pico32x.emu_flags & P32XF_68KPOLL) {
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SekCycleCnt = SekCycleAim;
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return;
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}
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if ((cyc_do = SekCycleAim - SekCycleCnt) <= 0)
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return;
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#if defined(EMU_CORE_DEBUG)
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// this means we do run-compare
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SekCycleCnt+=CM_compareRun(cyc_do, 0);
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#elif defined(EMU_C68K)
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PicoCpuCM68k.cycles=cyc_do;
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CycloneRun(&PicoCpuCM68k);
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SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles;
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#elif defined(EMU_M68K)
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SekCycleCnt+=m68k_execute(cyc_do);
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#elif defined(EMU_F68K)
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SekCycleCnt+=fm68k_emulate(cyc_do+1, 0, 0);
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#endif
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}
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// ~1463.8, but due to cache misses and slow mem
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// it's much lower than that
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#define SH2_LINE_CYCLES 700
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#define PICO_32X
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#define RUN_SH2S \
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if (!(Pico32x.emu_flags & (P32XF_MSH2POLL|P32XF_MSH2VPOLL))) \
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sh2_execute(&msh2, SH2_LINE_CYCLES);
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#include "../pico_cmn.c"
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void PicoFrame32x(void)
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{
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Pico32x.vdp_regs[0x0a/2] &= ~P32XV_VBLK; // get out of vblank
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if ((Pico32x.vdp_regs[0] & 3 ) != 0) // no forced blanking
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Pico32x.vdp_regs[0x0a/2] &= ~P32XV_PEN; // no pal access
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p32x_poll_event(1);
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PicoFrameStart();
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PicoFrameHints();
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// hack
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if (Pico.m.frame_count == 83) {
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Pico32xMem->sdram[0x3610 ^ 1] = 'R';
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Pico32xMem->sdram[0x3611 ^ 1] = 'E';
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Pico32xMem->sdram[0x3612 ^ 1] = 'D';
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Pico32xMem->sdram[0x3613 ^ 1] = 'Y';
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}
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}
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