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mcd, improve cpu scheduling

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This commit is contained in:
kub 2023-05-09 10:04:40 +00:00
parent 3a77090514
commit 02db230830
2 changed files with 10 additions and 9 deletions
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17
pico/cd/memory.c
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@ -71,9 +71,9 @@ void m68k_comm_check(u32 a)
u32 cycles = SekCyclesDone();
u32 clkdiff = cycles - Pico_mcd->m.m68k_poll_clk;
pcd_sync_s68k(cycles, 0);
if (a >= 0x0e && !Pico_mcd->m.need_sync) {
if (a == 0x0e && !Pico_mcd->m.need_sync && (Pico_mcd->s68k_regs[3]&0x4)) {
// there are cases when slave updates comm and only switches RAM
// over after that (mcd1b), so there must be a resync..
// over after that (mcd1 bios), so there must be a resync..
SekEndRun(64);
Pico_mcd->m.need_sync = 1;
}
@ -86,7 +86,7 @@ void m68k_comm_check(u32 a)
}
Pico_mcd->m.m68k_poll_cnt++;
if(Pico_mcd->m.m68k_poll_cnt >= POLL_LIMIT)
SekEndRun(0);
SekEndRun(8);
}
#ifndef _ASM_CD_MEMORY_C
@ -241,7 +241,7 @@ write_comm:
// slave. This can produce race conditions where slave switches RAM back to
// master while master is delayed by interrupt before the check executes.
// Delay slave a bit to make sure master can check before slave changes.
SekCycleCntS68k += 24;
SekCycleCntS68k += 24; // Silpheed
}
if (Pico_mcd->m.s68k_poll_a == (a & ~1))
{
@ -249,7 +249,7 @@ write_comm:
elprintf(EL_CDPOLL, "s68k poll release, a=%02x", a);
SekSetStopS68k(0);
}
Pico_mcd->m.s68k_poll_a = 0;
Pico_mcd->m.s68k_poll_cnt = 0;
}
}
@ -259,6 +259,7 @@ u32 s68k_poll_detect(u32 a, u32 d)
u32 cycles, cnt = 0;
if (SekIsStoppedS68k())
return d;
SekEndRunS68k(8);
cycles = SekCyclesDoneS68k();
if (!SekNotPollingS68k && a == Pico_mcd->m.s68k_poll_a) {
@ -266,7 +267,7 @@ u32 s68k_poll_detect(u32 a, u32 d)
if (clkdiff <= POLL_CYCLES) {
cnt = Pico_mcd->m.s68k_poll_cnt + 1;
//printf("-- diff: %u, cnt = %i\n", clkdiff, cnt);
if (Pico_mcd->m.s68k_poll_cnt > POLL_LIMIT) {
if (cnt > POLL_LIMIT) {
SekSetStopS68k(1);
elprintf(EL_CDPOLL, "s68k poll detected @%06x, a=%02x",
SekPcS68k, a);
@ -495,7 +496,7 @@ write_comm:
Pico_mcd->s68k_regs[a] = (u8) d;
if (Pico_mcd->m.m68k_poll_cnt)
SekEndRunS68k(0);
SekEndRunS68k(8);
Pico_mcd->m.m68k_poll_cnt = 0;
}
@ -559,7 +560,7 @@ write_comm:
r[a] = d >> 8;
r[a + 1] = d;
if (Pico_mcd->m.m68k_poll_cnt)
SekEndRunS68k(0);
SekEndRunS68k(8);
Pico_mcd->m.m68k_poll_cnt = 0;
}