From c36dbc1dcdc33c6252930c6d9ffc90a0ffa6f3c0 Mon Sep 17 00:00:00 2001 From: kub Date: Thu, 11 May 2023 22:39:28 +0000 Subject: [PATCH] mcd, fix Word-RAM in 2M mode --- pico/cd/mcd.c | 6 +++--- pico/cd/memory.c | 54 ++++++++++++++++++++++-------------------------- pico/pico_int.h | 1 - 3 files changed, 28 insertions(+), 33 deletions(-) diff --git a/pico/cd/mcd.c b/pico/cd/mcd.c index 13ada8b7..840f916c 100644 --- a/pico/cd/mcd.c +++ b/pico/cd/mcd.c @@ -257,7 +257,7 @@ void pcd_irq_s68k(int irq, int state) { if (state) { SekInterruptS68k(irq); - Pico_mcd->m.state_flags &= ~(PCD_ST_S68K_POLL|PCD_ST_S68K_SLEEP); + Pico_mcd->m.state_flags &= ~PCD_ST_S68K_POLL; Pico_mcd->m.s68k_poll_cnt = 0; } else SekInterruptClearS68k(irq); @@ -319,7 +319,7 @@ void pcd_run_cpus_normal(int m68k_cycles) } #ifdef USE_POLL_DETECT - if (Pico_mcd->m.state_flags & (PCD_ST_M68K_POLL|PCD_ST_M68K_SLEEP)) { + if (Pico_mcd->m.state_flags & PCD_ST_M68K_POLL) { int s68k_left; // main CPU is polling, (wake and) run sub only if (Pico_mcd->m.state_flags & (PCD_ST_S68K_POLL|PCD_ST_S68K_SLEEP)) { @@ -333,7 +333,7 @@ void pcd_run_cpus_normal(int m68k_cycles) Pico.t.m68c_cnt -= ((long long)s68k_left * mcd_s68k_cycle_mult >> 16); if (Pico_mcd->m.state_flags & (PCD_ST_S68K_POLL|PCD_ST_S68K_SLEEP)) { // slave has stopped, wake master to avoid lockups - Pico_mcd->m.state_flags &= ~(PCD_ST_M68K_POLL|PCD_ST_M68K_SLEEP); + Pico_mcd->m.state_flags &= ~PCD_ST_M68K_POLL; Pico_mcd->m.m68k_poll_cnt = 0; } diff --git a/pico/cd/memory.c b/pico/cd/memory.c index 2fbf8816..e51ea240 100644 --- a/pico/cd/memory.c +++ b/pico/cd/memory.c @@ -263,7 +263,6 @@ u32 s68k_poll_detect(u32 a, u32 d) u32 cycles, cnt = 0; if (Pico_mcd->m.state_flags & (PCD_ST_S68K_POLL|PCD_ST_S68K_SLEEP)) return d; - SekEndRunS68k(8); cycles = SekCyclesDoneS68k(); if (!SekNotPollingS68k && a == Pico_mcd->m.s68k_poll_a) { @@ -274,9 +273,11 @@ u32 s68k_poll_detect(u32 a, u32 d) Pico_mcd->m.state_flags &= ~PCD_ST_S68K_POLL; if (cnt > POLL_LIMIT) { Pico_mcd->m.state_flags |= PCD_ST_S68K_POLL; + SekEndRunS68k(8); elprintf(EL_CDPOLL, "s68k poll detected @%06x, a=%02x", SekPcS68k, a); - } + } else if (cnt > 2) + SekEndRunS68k(80); } } Pico_mcd->m.s68k_poll_a = a; @@ -1073,59 +1074,55 @@ static void remap_prg_window(u32 r1, u32 r3) } } -// if main or sub CPU accesses Word-RAM while it is assigned to the other CPU +// if sub CPU accesses Word-RAM while it is assigned to the main CPU, // GA doesn't assert DTACK, which means the CPU is blocked until the Word_RAM // is reassigned to it (e.g. Mega Race). -static u32 m68k_wordram_read8(u32 a) +// since DTACK isn't on the expansion port, main cpu accesses are not blocked. +// XXX is data read/written if main is accessing Word_RAM while not owning it? +static u32 m68k_wordram_sub_read8(u32 a) { - Pico_mcd->m.state_flags |= PCD_ST_M68K_SLEEP; - SekEndRun(0); - return Pico_mcd->word_ram2M[MEM_BE2(a) & 0x3ffff]; + return 0xff; +// return Pico_mcd->word_ram2M[MEM_BE2(a) & 0x3ffff]; } -static u32 m68k_wordram_read16(u32 a) +static u32 m68k_wordram_sub_read16(u32 a) { - Pico_mcd->m.state_flags |= PCD_ST_M68K_SLEEP; - SekEndRun(0); - return ((u16 *)Pico_mcd->word_ram2M)[(a >> 1) & 0x1ffff]; + return 0xffff; +// return ((u16 *)Pico_mcd->word_ram2M)[(a >> 1) & 0x1ffff]; } -static void m68k_wordram_write8(u32 a, u32 d) +static void m68k_wordram_sub_write8(u32 a, u32 d) { - Pico_mcd->m.state_flags |= PCD_ST_M68K_SLEEP; - SekEndRun(0); - Pico_mcd->word_ram2M[MEM_BE2(a) & 0x3ffff] = d; +// Pico_mcd->word_ram2M[MEM_BE2(a) & 0x3ffff] = d; } -static void m68k_wordram_write16(u32 a, u32 d) +static void m68k_wordram_sub_write16(u32 a, u32 d) { - Pico_mcd->m.state_flags |= PCD_ST_M68K_SLEEP; - SekEndRun(0); - ((u16 *)Pico_mcd->word_ram2M)[(a >> 1) & 0x1ffff] = d; +// ((u16 *)Pico_mcd->word_ram2M)[(a >> 1) & 0x1ffff] = d; } -static u32 s68k_wordram_read8(u32 a) +static u32 s68k_wordram_main_read8(u32 a) { Pico_mcd->m.state_flags |= PCD_ST_S68K_SLEEP; SekEndRunS68k(0); return Pico_mcd->word_ram2M[MEM_BE2(a) & 0x3ffff]; } -static u32 s68k_wordram_read16(u32 a) +static u32 s68k_wordram_main_read16(u32 a) { Pico_mcd->m.state_flags |= PCD_ST_S68K_SLEEP; SekEndRunS68k(0); return ((u16 *)Pico_mcd->word_ram2M)[(a >> 1) & 0x1ffff]; } -static void s68k_wordram_write8(u32 a, u32 d) +static void s68k_wordram_main_write8(u32 a, u32 d) { Pico_mcd->m.state_flags |= PCD_ST_S68K_SLEEP; SekEndRunS68k(0); Pico_mcd->word_ram2M[MEM_BE2(a) & 0x3ffff] = d; } -static void s68k_wordram_write16(u32 a, u32 d) +static void s68k_wordram_main_write16(u32 a, u32 d) { Pico_mcd->m.state_flags |= PCD_ST_S68K_SLEEP; SekEndRunS68k(0); @@ -1141,24 +1138,23 @@ static void remap_word_ram(u32 r3) // 2M mode. bank = Pico_mcd->word_ram2M; if (r3 & 1) { - Pico_mcd->m.state_flags &= ~PCD_ST_M68K_SLEEP; cpu68k_map_all_ram(0x200000, 0x23ffff, bank, 0); cpu68k_map_all_funcs(0x80000, 0xbffff, - s68k_wordram_read8, s68k_wordram_read16, - s68k_wordram_write8, s68k_wordram_write16, 1); + s68k_wordram_main_read8, s68k_wordram_main_read16, + s68k_wordram_main_write8, s68k_wordram_main_write16, 1); } else { Pico_mcd->m.state_flags &= ~PCD_ST_S68K_SLEEP; cpu68k_map_all_ram(0x080000, 0x0bffff, bank, 1); cpu68k_map_all_funcs(0x200000, 0x23ffff, - m68k_wordram_read8, m68k_wordram_read16, - m68k_wordram_write8, m68k_wordram_write16, 0); + m68k_wordram_sub_read8, m68k_wordram_sub_read16, + m68k_wordram_sub_write8, m68k_wordram_sub_write16, 0); } // TODO: handle 0x0c0000 } else { int b0 = r3 & 1; int m = (r3 & 0x18) >> 3; - Pico_mcd->m.state_flags &= ~(PCD_ST_M68K_SLEEP|PCD_ST_S68K_SLEEP); + Pico_mcd->m.state_flags &= ~PCD_ST_S68K_SLEEP; bank = Pico_mcd->word_ram1M[b0]; cpu68k_map_all_ram(0x200000, 0x21ffff, bank, 0); bank = Pico_mcd->word_ram1M[b0 ^ 1]; diff --git a/pico/pico_int.h b/pico/pico_int.h index 970ee608..ac8a7ecf 100644 --- a/pico/pico_int.h +++ b/pico/pico_int.h @@ -509,7 +509,6 @@ struct mcd_pcm #define PCD_ST_S68K_RST 1 #define PCD_ST_S68K_SYNC 2 #define PCD_ST_S68K_SLEEP 4 -#define PCD_ST_M68K_SLEEP 8 #define PCD_ST_S68K_POLL 16 #define PCD_ST_M68K_POLL 32 -- 2.39.2