+/* most timing is in 68k clock */
+void sync_sh2s_normal(unsigned int m68k_target)
+{
+ unsigned int now, target, timer_cycles;
+ int cycles, done;
+
+ elprintf(EL_32X, "sh2 sync to %u", m68k_target);
+
+ if (!(Pico32x.regs[0] & P32XS_nRES))
+ return; // rare
+
+ now = msh2.m68krcycles_done;
+ if (CYCLES_GT(now, ssh2.m68krcycles_done))
+ now = ssh2.m68krcycles_done;
+ timer_cycles = now;
+
+ while (CYCLES_GT(m68k_target, now))
+ {
+ if (event_time_next && CYCLES_GE(now, event_time_next))
+ run_events(now);
+
+ target = m68k_target;
+ if (event_time_next && CYCLES_GT(target, event_time_next))
+ target = event_time_next;
+
+ while (CYCLES_GT(target, now))
+ {
+ elprintf(EL_32X, "sh2 exec to %u %d,%d/%d, flags %x", target,
+ target - msh2.m68krcycles_done, target - ssh2.m68krcycles_done,
+ m68k_target - now, Pico32x.emu_flags);
+
+ if (Pico32x.emu_flags & (P32XF_SSH2POLL|P32XF_SSH2VPOLL)) {
+ ssh2.m68krcycles_done = target;
+ }
+ else {
+ cycles = target - ssh2.m68krcycles_done;
+ if (cycles > 0) {
+ done = sh2_execute(&ssh2, C_M68K_TO_SH2(ssh2, cycles));
+ ssh2.m68krcycles_done += C_SH2_TO_M68K(ssh2, done);
+
+ if (event_time_next && CYCLES_GT(target, event_time_next))
+ target = event_time_next;
+ }
+ }
+
+ if (Pico32x.emu_flags & (P32XF_MSH2POLL|P32XF_MSH2VPOLL)) {
+ msh2.m68krcycles_done = target;
+ }
+ else {
+ cycles = target - msh2.m68krcycles_done;
+ if (cycles > 0) {
+ done = sh2_execute(&msh2, C_M68K_TO_SH2(msh2, cycles));
+ msh2.m68krcycles_done += C_SH2_TO_M68K(msh2, done);
+
+ if (event_time_next && CYCLES_GT(target, event_time_next))
+ target = event_time_next;
+ }
+ }
+
+ now = msh2.m68krcycles_done;
+ if (CYCLES_GT(now, ssh2.m68krcycles_done))
+ now = ssh2.m68krcycles_done;
+ }
+
+ p32x_timers_do(now - timer_cycles);
+ timer_cycles = now;
+ }
+}
+
+#define STEP_68K 24
+
+void sync_sh2s_lockstep(unsigned int m68k_target)
+{
+ unsigned int mcycles;
+
+ mcycles = msh2.m68krcycles_done;
+ if (ssh2.m68krcycles_done < mcycles)
+ mcycles = ssh2.m68krcycles_done;
+
+ while (mcycles < m68k_target) {
+ mcycles += STEP_68K;
+ sync_sh2s_normal(mcycles);
+ }