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- /*
- * Memory I/O handlers for Sega/Mega CD.
- * (C) notaz, 2007-2009
- *
- * This work is licensed under the terms of MAME license.
- * See COPYING file in the top-level directory.
- */
- #include "../pico_int.h"
- #include "../memory.h"
- #include "gfx_cd.h"
- #include "pcm.h"
- uptr s68k_read8_map [0x1000000 >> M68K_MEM_SHIFT];
- uptr s68k_read16_map [0x1000000 >> M68K_MEM_SHIFT];
- uptr s68k_write8_map [0x1000000 >> M68K_MEM_SHIFT];
- uptr s68k_write16_map[0x1000000 >> M68K_MEM_SHIFT];
- MAKE_68K_READ8(s68k_read8, s68k_read8_map)
- MAKE_68K_READ16(s68k_read16, s68k_read16_map)
- MAKE_68K_READ32(s68k_read32, s68k_read16_map)
- MAKE_68K_WRITE8(s68k_write8, s68k_write8_map)
- MAKE_68K_WRITE16(s68k_write16, s68k_write16_map)
- MAKE_68K_WRITE32(s68k_write32, s68k_write16_map)
- // -----------------------------------------------------------------
- // provided by ASM code:
- #ifdef _ASM_CD_MEMORY_C
- u32 PicoReadM68k8_io(u32 a);
- u32 PicoReadM68k16_io(u32 a);
- void PicoWriteM68k8_io(u32 a, u32 d);
- void PicoWriteM68k16_io(u32 a, u32 d);
- u32 PicoReadS68k8_pr(u32 a);
- u32 PicoReadS68k16_pr(u32 a);
- void PicoWriteS68k8_pr(u32 a, u32 d);
- void PicoWriteS68k16_pr(u32 a, u32 d);
- u32 PicoReadM68k8_cell0(u32 a);
- u32 PicoReadM68k8_cell1(u32 a);
- u32 PicoReadM68k16_cell0(u32 a);
- u32 PicoReadM68k16_cell1(u32 a);
- void PicoWriteM68k8_cell0(u32 a, u32 d);
- void PicoWriteM68k8_cell1(u32 a, u32 d);
- void PicoWriteM68k16_cell0(u32 a, u32 d);
- void PicoWriteM68k16_cell1(u32 a, u32 d);
- u32 PicoReadS68k8_dec0(u32 a);
- u32 PicoReadS68k8_dec1(u32 a);
- u32 PicoReadS68k16_dec0(u32 a);
- u32 PicoReadS68k16_dec1(u32 a);
- void PicoWriteS68k8_dec_m0b0(u32 a, u32 d);
- void PicoWriteS68k8_dec_m1b0(u32 a, u32 d);
- void PicoWriteS68k8_dec_m2b0(u32 a, u32 d);
- void PicoWriteS68k8_dec_m0b1(u32 a, u32 d);
- void PicoWriteS68k8_dec_m1b1(u32 a, u32 d);
- void PicoWriteS68k8_dec_m2b1(u32 a, u32 d);
- void PicoWriteS68k16_dec_m0b0(u32 a, u32 d);
- void PicoWriteS68k16_dec_m1b0(u32 a, u32 d);
- void PicoWriteS68k16_dec_m2b0(u32 a, u32 d);
- void PicoWriteS68k16_dec_m0b1(u32 a, u32 d);
- void PicoWriteS68k16_dec_m1b1(u32 a, u32 d);
- void PicoWriteS68k16_dec_m2b1(u32 a, u32 d);
- #endif
- static void remap_prg_window(void);
- static void remap_word_ram(int r3);
- // poller detection
- #define POLL_LIMIT 16
- #define POLL_CYCLES 124
- unsigned int s68k_poll_adclk, s68k_poll_cnt;
- #ifndef _ASM_CD_MEMORY_C
- static u32 m68k_reg_read16(u32 a)
- {
- u32 d=0;
- a &= 0x3e;
- switch (a) {
- case 0:
- d = ((Pico_mcd->s68k_regs[0x33]<<13)&0x8000) | Pico_mcd->m.busreq; // here IFL2 is always 0, just like in Gens
- goto end;
- case 2:
- d = (Pico_mcd->s68k_regs[a]<<8) | (Pico_mcd->s68k_regs[a+1]&0xc7);
- elprintf(EL_CDREG3, "m68k_regs r3: %02x @%06x", (u8)d, SekPc);
- goto end;
- case 4:
- d = Pico_mcd->s68k_regs[4]<<8;
- goto end;
- case 6:
- d = *(u16 *)(Pico_mcd->bios + 0x72);
- goto end;
- case 8:
- d = Read_CDC_Host(0);
- goto end;
- case 0xA:
- elprintf(EL_UIO, "m68k FIXME: reserved read");
- goto end;
- case 0xC:
- d = Pico_mcd->m.timer_stopwatch >> 16;
- elprintf(EL_CDREGS, "m68k stopwatch timer read (%04x)", d);
- goto end;
- }
- if (a < 0x30) {
- // comm flag/cmd/status (0xE-0x2F)
- d = (Pico_mcd->s68k_regs[a]<<8) | Pico_mcd->s68k_regs[a+1];
- goto end;
- }
- elprintf(EL_UIO, "m68k_regs FIXME invalid read @ %02x", a);
- end:
- return d;
- }
- #endif
- #ifndef _ASM_CD_MEMORY_C
- static
- #endif
- void m68k_reg_write8(u32 a, u32 d)
- {
- u32 dold;
- a &= 0x3f;
- switch (a) {
- case 0:
- d &= 1;
- if ((d&1) && (Pico_mcd->s68k_regs[0x33]&(1<<2))) { elprintf(EL_INTS, "m68k: s68k irq 2"); SekInterruptS68k(2); }
- return;
- case 1:
- d &= 3;
- if (!(d&1)) Pico_mcd->m.state_flags |= 1; // reset pending, needed to be sure we fetch the right vectors on reset
- if ( (Pico_mcd->m.busreq&1) != (d&1)) elprintf(EL_INTSW, "m68k: s68k reset %i", !(d&1));
- if ( (Pico_mcd->m.busreq&2) != (d&2)) elprintf(EL_INTSW, "m68k: s68k brq %i", (d&2)>>1);
- if ((Pico_mcd->m.state_flags&1) && (d&3)==1) {
- SekResetS68k(); // S68k comes out of RESET or BRQ state
- Pico_mcd->m.state_flags&=~1;
- elprintf(EL_CDREGS, "m68k: resetting s68k, cycles=%i", SekCyclesLeft);
- }
- if (!(d & 1))
- d |= 2; // verified: reset also gives bus
- if ((d ^ Pico_mcd->m.busreq) & 2)
- remap_prg_window();
- Pico_mcd->m.busreq = d;
- return;
- case 2:
- elprintf(EL_CDREGS, "m68k: prg wp=%02x", d);
- Pico_mcd->s68k_regs[2] = d; // really use s68k side register
- return;
- case 3:
- dold = Pico_mcd->s68k_regs[3];
- elprintf(EL_CDREG3, "m68k_regs w3: %02x @%06x", (u8)d, SekPc);
- //if ((Pico_mcd->s68k_regs[3]&4) != (d&4)) dprintf("m68k: ram mode %i mbit", (d&4) ? 1 : 2);
- //if ((Pico_mcd->s68k_regs[3]&2) != (d&2)) dprintf("m68k: %s", (d&4) ? ((d&2) ? "word swap req" : "noop?") :
- // ((d&2) ? "word ram to s68k" : "word ram to m68k"));
- if (dold & 4) { // 1M mode
- d ^= 2; // writing 0 to DMNA actually sets it, 1 does nothing
- } else {
- if ((d ^ dold) & d & 2) { // DMNA is being set
- dold &= ~1; // return word RAM to s68k
- /* Silpheed hack: bset(w3), r3, btst, bne, r3 */
- SekEndRun(20+16+10+12+16);
- }
- }
- Pico_mcd->s68k_regs[3] = (d & 0xc2) | (dold & 0x1f);
- if ((d ^ dold) & 0xc0) {
- elprintf(EL_CDREGS, "m68k: prg bank: %i -> %i", (Pico_mcd->s68k_regs[a]>>6), ((d>>6)&3));
- remap_prg_window();
- }
- #ifdef USE_POLL_DETECT
- if ((s68k_poll_adclk&0xfe) == 2 && s68k_poll_cnt > POLL_LIMIT) {
- SekSetStopS68k(0); s68k_poll_adclk = 0;
- elprintf(EL_CDPOLL, "s68k poll release, a=%02x", a);
- }
- #endif
- return;
- case 6:
- Pico_mcd->bios[0x72 + 1] = d; // simple hint vector changer
- return;
- case 7:
- Pico_mcd->bios[0x72] = d;
- elprintf(EL_CDREGS, "hint vector set to %04x%04x",
- ((u16 *)Pico_mcd->bios)[0x70/2], ((u16 *)Pico_mcd->bios)[0x72/2]);
- return;
- case 0xf:
- d = (d << 1) | ((d >> 7) & 1); // rol8 1 (special case)
- case 0xe:
- //dprintf("m68k: comm flag: %02x", d);
- Pico_mcd->s68k_regs[0xe] = d;
- #ifdef USE_POLL_DETECT
- if ((s68k_poll_adclk&0xfe) == 0xe && s68k_poll_cnt > POLL_LIMIT) {
- SekSetStopS68k(0); s68k_poll_adclk = 0;
- elprintf(EL_CDPOLL, "s68k poll release, a=%02x", a);
- }
- #endif
- return;
- }
- if ((a&0xf0) == 0x10) {
- Pico_mcd->s68k_regs[a] = d;
- #ifdef USE_POLL_DETECT
- if ((a&0xfe) == (s68k_poll_adclk&0xfe) && s68k_poll_cnt > POLL_LIMIT) {
- SekSetStopS68k(0); s68k_poll_adclk = 0;
- elprintf(EL_CDPOLL, "s68k poll release, a=%02x", a);
- }
- #endif
- return;
- }
- elprintf(EL_UIO, "m68k FIXME: invalid write? [%02x] %02x", a, d);
- }
- #ifndef _ASM_CD_MEMORY_C
- static
- #endif
- u32 s68k_poll_detect(u32 a, u32 d)
- {
- #ifdef USE_POLL_DETECT
- // needed mostly for Cyclone, which doesn't always check it's cycle counter
- if (SekIsStoppedS68k()) return d;
- // polling detection
- if (a == (s68k_poll_adclk&0xff)) {
- unsigned int clkdiff = SekCyclesDoneS68k() - (s68k_poll_adclk>>8);
- if (clkdiff <= POLL_CYCLES) {
- s68k_poll_cnt++;
- //printf("-- diff: %u, cnt = %i\n", clkdiff, s68k_poll_cnt);
- if (s68k_poll_cnt > POLL_LIMIT) {
- SekSetStopS68k(1);
- elprintf(EL_CDPOLL, "s68k poll detected @ %06x, a=%02x", SekPcS68k, a);
- }
- s68k_poll_adclk = (SekCyclesDoneS68k() << 8) | a;
- return d;
- }
- }
- s68k_poll_adclk = (SekCyclesDoneS68k() << 8) | a;
- s68k_poll_cnt = 0;
- #endif
- return d;
- }
- #define READ_FONT_DATA(basemask) \
- { \
- unsigned int fnt = *(unsigned int *)(Pico_mcd->s68k_regs + 0x4c); \
- unsigned int col0 = (fnt >> 8) & 0x0f, col1 = (fnt >> 12) & 0x0f; \
- if (fnt & (basemask << 0)) d = col1 ; else d = col0; \
- if (fnt & (basemask << 1)) d |= col1 << 4; else d |= col0 << 4; \
- if (fnt & (basemask << 2)) d |= col1 << 8; else d |= col0 << 8; \
- if (fnt & (basemask << 3)) d |= col1 << 12; else d |= col0 << 12; \
- }
- #ifndef _ASM_CD_MEMORY_C
- static
- #endif
- u32 s68k_reg_read16(u32 a)
- {
- u32 d=0;
- switch (a) {
- case 0:
- return ((Pico_mcd->s68k_regs[0]&3)<<8) | 1; // ver = 0, not in reset state
- case 2:
- d = (Pico_mcd->s68k_regs[2]<<8) | (Pico_mcd->s68k_regs[3]&0x1f);
- elprintf(EL_CDREG3, "s68k_regs r3: %02x @%06x", (u8)d, SekPcS68k);
- return s68k_poll_detect(a, d);
- case 6:
- return CDC_Read_Reg();
- case 8:
- return Read_CDC_Host(1); // Gens returns 0 here on byte reads
- case 0xC:
- d = Pico_mcd->m.timer_stopwatch >> 16;
- elprintf(EL_CDREGS, "s68k stopwatch timer read (%04x)", d);
- return d;
- case 0x30:
- elprintf(EL_CDREGS, "s68k int3 timer read (%02x)", Pico_mcd->s68k_regs[31]);
- return Pico_mcd->s68k_regs[31];
- case 0x34: // fader
- return 0; // no busy bit
- case 0x50: // font data (check: Lunar 2, Silpheed)
- READ_FONT_DATA(0x00100000);
- return d;
- case 0x52:
- READ_FONT_DATA(0x00010000);
- return d;
- case 0x54:
- READ_FONT_DATA(0x10000000);
- return d;
- case 0x56:
- READ_FONT_DATA(0x01000000);
- return d;
- }
- d = (Pico_mcd->s68k_regs[a]<<8) | Pico_mcd->s68k_regs[a+1];
- if (a >= 0x0e && a < 0x30)
- return s68k_poll_detect(a, d);
- return d;
- }
- #ifndef _ASM_CD_MEMORY_C
- static
- #endif
- void s68k_reg_write8(u32 a, u32 d)
- {
- // Warning: d might have upper bits set
- switch (a) {
- case 2:
- return; // only m68k can change WP
- case 3: {
- int dold = Pico_mcd->s68k_regs[3];
- elprintf(EL_CDREG3, "s68k_regs w3: %02x @%06x", (u8)d, SekPcS68k);
- d &= 0x1d;
- d |= dold & 0xc2;
- if (d & 4)
- {
- if ((d ^ dold) & 0x1d) {
- d &= ~2; // in case of mode or bank change we clear DMNA (m68k req) bit
- remap_word_ram(d);
- }
- if (!(dold & 4)) {
- elprintf(EL_CDREG3, "wram mode 2M->1M");
- wram_2M_to_1M(Pico_mcd->word_ram2M);
- }
- }
- else
- {
- if (dold & 4) {
- elprintf(EL_CDREG3, "wram mode 1M->2M");
- if (!(d&1)) { // it didn't set the ret bit, which means it doesn't want to give WRAM to m68k
- d &= ~3;
- d |= (dold&1) ? 2 : 1; // then give it to the one which had bank0 in 1M mode
- }
- wram_1M_to_2M(Pico_mcd->word_ram2M);
- remap_word_ram(d);
- }
- // s68k can only set RET, writing 0 has no effect
- else if ((dold ^ d) & d & 1) { // RET being set
- SekEndRunS68k(20+16+10+12+16); // see DMNA case
- } else
- d |= dold & 1;
- if (d & 1)
- d &= ~2; // DMNA clears
- }
- break;
- }
- case 4:
- elprintf(EL_CDREGS, "s68k CDC dest: %x", d&7);
- Pico_mcd->s68k_regs[4] = (Pico_mcd->s68k_regs[4]&0xC0) | (d&7); // CDC mode
- return;
- case 5:
- //dprintf("s68k CDC reg addr: %x", d&0xf);
- break;
- case 7:
- CDC_Write_Reg(d);
- return;
- case 0xa:
- elprintf(EL_CDREGS, "s68k set CDC dma addr");
- break;
- case 0xc:
- case 0xd:
- elprintf(EL_CDREGS, "s68k set stopwatch timer");
- Pico_mcd->m.timer_stopwatch = 0;
- return;
- case 0xe:
- Pico_mcd->s68k_regs[0xf] = (d>>1) | (d<<7); // ror8 1, Gens note: Dragons lair
- return;
- case 0x31:
- elprintf(EL_CDREGS, "s68k set int3 timer: %02x", d);
- Pico_mcd->m.timer_int3 = (d & 0xff) << 16;
- break;
- case 0x33: // IRQ mask
- elprintf(EL_CDREGS, "s68k irq mask: %02x", d);
- if ((d&(1<<4)) && (Pico_mcd->s68k_regs[0x37]&4) && !(Pico_mcd->s68k_regs[0x33]&(1<<4))) {
- CDD_Export_Status();
- }
- break;
- case 0x34: // fader
- Pico_mcd->s68k_regs[a] = (u8) d & 0x7f;
- return;
- case 0x36:
- return; // d/m bit is unsetable
- case 0x37: {
- u32 d_old = Pico_mcd->s68k_regs[0x37];
- Pico_mcd->s68k_regs[0x37] = d&7;
- if ((d&4) && !(d_old&4)) {
- CDD_Export_Status();
- }
- return;
- }
- case 0x4b:
- Pico_mcd->s68k_regs[a] = (u8) d;
- CDD_Import_Command();
- return;
- }
- if ((a&0x1f0) == 0x10 || (a >= 0x38 && a < 0x42))
- {
- elprintf(EL_UIO, "s68k FIXME: invalid write @ %02x?", a);
- return;
- }
- Pico_mcd->s68k_regs[a] = (u8) d;
- }
- // -----------------------------------------------------------------
- // Main 68k
- // -----------------------------------------------------------------
- #ifndef _ASM_CD_MEMORY_C
- #include "cell_map.c"
- // WORD RAM, cell aranged area (220000 - 23ffff)
- static u32 PicoReadM68k8_cell0(u32 a)
- {
- a = (a&3) | (cell_map(a >> 2) << 2); // cell arranged
- return Pico_mcd->word_ram1M[0][a ^ 1];
- }
- static u32 PicoReadM68k8_cell1(u32 a)
- {
- a = (a&3) | (cell_map(a >> 2) << 2);
- return Pico_mcd->word_ram1M[1][a ^ 1];
- }
- static u32 PicoReadM68k16_cell0(u32 a)
- {
- a = (a&2) | (cell_map(a >> 2) << 2);
- return *(u16 *)(Pico_mcd->word_ram1M[0] + a);
- }
- static u32 PicoReadM68k16_cell1(u32 a)
- {
- a = (a&2) | (cell_map(a >> 2) << 2);
- return *(u16 *)(Pico_mcd->word_ram1M[1] + a);
- }
- static void PicoWriteM68k8_cell0(u32 a, u32 d)
- {
- a = (a&3) | (cell_map(a >> 2) << 2);
- Pico_mcd->word_ram1M[0][a ^ 1] = d;
- }
- static void PicoWriteM68k8_cell1(u32 a, u32 d)
- {
- a = (a&3) | (cell_map(a >> 2) << 2);
- Pico_mcd->word_ram1M[1][a ^ 1] = d;
- }
- static void PicoWriteM68k16_cell0(u32 a, u32 d)
- {
- a = (a&3) | (cell_map(a >> 2) << 2);
- *(u16 *)(Pico_mcd->word_ram1M[0] + a) = d;
- }
- static void PicoWriteM68k16_cell1(u32 a, u32 d)
- {
- a = (a&3) | (cell_map(a >> 2) << 2);
- *(u16 *)(Pico_mcd->word_ram1M[1] + a) = d;
- }
- #endif
- // RAM cart (40000 - 7fffff, optional)
- static u32 PicoReadM68k8_ramc(u32 a)
- {
- u32 d = 0;
- if (a == 0x400001) {
- if (SRam.data != NULL)
- d = 3; // 64k cart
- return d;
- }
- if ((a & 0xfe0000) == 0x600000) {
- if (SRam.data != NULL)
- d = SRam.data[((a >> 1) & 0xffff) + 0x2000];
- return d;
- }
- if (a == 0x7fffff)
- return Pico_mcd->m.bcram_reg;
- elprintf(EL_UIO, "m68k unmapped r8 [%06x] @%06x", a, SekPc);
- return d;
- }
- static u32 PicoReadM68k16_ramc(u32 a)
- {
- elprintf(EL_ANOMALY, "ramcart r16: [%06x] @%06x", a, SekPcS68k);
- return PicoReadM68k8_ramc(a + 1);
- }
- static void PicoWriteM68k8_ramc(u32 a, u32 d)
- {
- if ((a & 0xfe0000) == 0x600000) {
- if (SRam.data != NULL && (Pico_mcd->m.bcram_reg & 1)) {
- SRam.data[((a>>1) & 0xffff) + 0x2000] = d;
- SRam.changed = 1;
- }
- return;
- }
- if (a == 0x7fffff) {
- Pico_mcd->m.bcram_reg = d;
- return;
- }
- elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc);
- }
- static void PicoWriteM68k16_ramc(u32 a, u32 d)
- {
- elprintf(EL_ANOMALY, "ramcart w16: [%06x] %04x @%06x", a, d, SekPcS68k);
- PicoWriteM68k8_ramc(a + 1, d);
- }
- // IO/control/cd registers (a10000 - ...)
- #ifndef _ASM_CD_MEMORY_C
- static u32 PicoReadM68k8_io(u32 a)
- {
- u32 d;
- if ((a & 0xff00) == 0x2000) { // a12000 - a120ff
- d = m68k_reg_read16(a); // TODO: m68k_reg_read8
- if (!(a & 1))
- d >>= 8;
- d &= 0xff;
- elprintf(EL_CDREGS, "m68k_regs r8: [%02x] %02x @%06x", a & 0x3f, d, SekPc);
- return d;
- }
- // fallback to default MD handler
- return PicoRead8_io(a);
- }
- static u32 PicoReadM68k16_io(u32 a)
- {
- u32 d;
- if ((a & 0xff00) == 0x2000) {
- d = m68k_reg_read16(a);
- elprintf(EL_CDREGS, "m68k_regs r16: [%02x] %04x @%06x", a & 0x3f, d, SekPc);
- return d;
- }
- return PicoRead16_io(a);
- }
- static void PicoWriteM68k8_io(u32 a, u32 d)
- {
- if ((a & 0xff00) == 0x2000) { // a12000 - a120ff
- elprintf(EL_CDREGS, "m68k_regs w8: [%02x] %02x @%06x", a&0x3f, d, SekPc);
- m68k_reg_write8(a, d);
- return;
- }
- PicoWrite16_io(a, d);
- }
- static void PicoWriteM68k16_io(u32 a, u32 d)
- {
- if ((a & 0xff00) == 0x2000) { // a12000 - a120ff
- elprintf(EL_CDREGS, "m68k_regs w16: [%02x] %04x @%06x", a&0x3f, d, SekPc);
- /* TODO FIXME?
- if (a == 0xe) { // special case, 2 byte writes would be handled differently
- Pico_mcd->s68k_regs[0xe] = d >> 8;
- #ifdef USE_POLL_DETECT
- if ((s68k_poll_adclk&0xfe) == 0xe && s68k_poll_cnt > POLL_LIMIT) {
- SekSetStopS68k(0); s68k_poll_adclk = 0;
- elprintf(EL_CDPOLL, "s68k poll release, a=%02x", a);
- }
- #endif
- return;
- }
- */
- m68k_reg_write8(a, d >> 8);
- m68k_reg_write8(a + 1, d & 0xff);
- return;
- }
- PicoWrite16_io(a, d);
- }
- #endif
- // -----------------------------------------------------------------
- // Sub 68k
- // -----------------------------------------------------------------
- static u32 s68k_unmapped_read8(u32 a)
- {
- elprintf(EL_UIO, "s68k unmapped r8 [%06x] @%06x", a, SekPc);
- return 0;
- }
- static u32 s68k_unmapped_read16(u32 a)
- {
- elprintf(EL_UIO, "s68k unmapped r16 [%06x] @%06x", a, SekPc);
- return 0;
- }
- static void s68k_unmapped_write8(u32 a, u32 d)
- {
- elprintf(EL_UIO, "s68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc);
- }
- static void s68k_unmapped_write16(u32 a, u32 d)
- {
- elprintf(EL_UIO, "s68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
- }
- // PRG RAM protected range (000000 - 00ff00)?
- // XXX verify: ff00 or 1fe00 max?
- static void PicoWriteS68k8_prgwp(u32 a, u32 d)
- {
- if (a >= (Pico_mcd->s68k_regs[2] << 8))
- Pico_mcd->prg_ram[a ^ 1] = d;
- }
- static void PicoWriteS68k16_prgwp(u32 a, u32 d)
- {
- if (a >= (Pico_mcd->s68k_regs[2] << 8))
- *(u16 *)(Pico_mcd->prg_ram + a) = d;
- }
- #ifndef _ASM_CD_MEMORY_C
- // decode (080000 - 0bffff, in 1M mode)
- static u32 PicoReadS68k8_dec0(u32 a)
- {
- u32 d = Pico_mcd->word_ram1M[0][((a >> 1) ^ 1) & 0x1ffff];
- if (a & 1)
- d &= 0x0f;
- else
- d >>= 4;
- return d;
- }
- static u32 PicoReadS68k8_dec1(u32 a)
- {
- u32 d = Pico_mcd->word_ram1M[1][((a >> 1) ^ 1) & 0x1ffff];
- if (a & 1)
- d &= 0x0f;
- else
- d >>= 4;
- return d;
- }
- static u32 PicoReadS68k16_dec0(u32 a)
- {
- u32 d = Pico_mcd->word_ram1M[0][((a >> 1) ^ 1) & 0x1ffff];
- d |= d << 4;
- d &= ~0xf0;
- return d;
- }
- static u32 PicoReadS68k16_dec1(u32 a)
- {
- u32 d = Pico_mcd->word_ram1M[1][((a >> 1) ^ 1) & 0x1ffff];
- d |= d << 4;
- d &= ~0xf0;
- return d;
- }
- /* check: jaguar xj 220 (draws entire world using decode) */
- #define mk_decode_w8(bank) \
- static void PicoWriteS68k8_dec_m0b##bank(u32 a, u32 d) \
- { \
- u8 *pd = &Pico_mcd->word_ram1M[bank][((a >> 1) ^ 1) & 0x1ffff]; \
- \
- if (!(a & 1)) \
- *pd = (*pd & 0x0f) | (d << 4); \
- else \
- *pd = (*pd & 0xf0) | (d & 0x0f); \
- } \
- \
- static void PicoWriteS68k8_dec_m1b##bank(u32 a, u32 d) \
- { \
- u8 *pd = &Pico_mcd->word_ram1M[bank][((a >> 1) ^ 1) & 0x1ffff]; \
- u8 mask = (a & 1) ? 0x0f : 0xf0; \
- \
- if (!(*pd & mask) && (d & 0x0f)) /* underwrite */ \
- PicoWriteS68k8_dec_m0b##bank(a, d); \
- } \
- \
- static void PicoWriteS68k8_dec_m2b##bank(u32 a, u32 d) /* ...and m3? */ \
- { \
- if (d & 0x0f) /* overwrite */ \
- PicoWriteS68k8_dec_m0b##bank(a, d); \
- }
- mk_decode_w8(0)
- mk_decode_w8(1)
- #define mk_decode_w16(bank) \
- static void PicoWriteS68k16_dec_m0b##bank(u32 a, u32 d) \
- { \
- u8 *pd = &Pico_mcd->word_ram1M[bank][((a >> 1) ^ 1) & 0x1ffff]; \
- \
- d &= 0x0f0f; \
- *pd = d | (d >> 4); \
- } \
- \
- static void PicoWriteS68k16_dec_m1b##bank(u32 a, u32 d) \
- { \
- u8 *pd = &Pico_mcd->word_ram1M[bank][((a >> 1) ^ 1) & 0x1ffff]; \
- \
- d &= 0x0f0f; /* underwrite */ \
- if (!(*pd & 0xf0)) *pd |= d >> 4; \
- if (!(*pd & 0x0f)) *pd |= d; \
- } \
- \
- static void PicoWriteS68k16_dec_m2b##bank(u32 a, u32 d) \
- { \
- u8 *pd = &Pico_mcd->word_ram1M[bank][((a >> 1) ^ 1) & 0x1ffff]; \
- \
- d &= 0x0f0f; /* overwrite */ \
- d |= d >> 4; \
- \
- if (!(d & 0xf0)) d |= *pd & 0xf0; \
- if (!(d & 0x0f)) d |= *pd & 0x0f; \
- *pd = d; \
- }
- mk_decode_w16(0)
- mk_decode_w16(1)
- #endif
- // backup RAM (fe0000 - feffff)
- static u32 PicoReadS68k8_bram(u32 a)
- {
- return Pico_mcd->bram[(a>>1)&0x1fff];
- }
- static u32 PicoReadS68k16_bram(u32 a)
- {
- u32 d;
- elprintf(EL_ANOMALY, "FIXME: s68k_bram r16: [%06x] @%06x", a, SekPcS68k);
- a = (a >> 1) & 0x1fff;
- d = Pico_mcd->bram[a++];
- d|= Pico_mcd->bram[a++] << 8; // probably wrong, TODO: verify
- return d;
- }
- static void PicoWriteS68k8_bram(u32 a, u32 d)
- {
- Pico_mcd->bram[(a >> 1) & 0x1fff] = d;
- SRam.changed = 1;
- }
- static void PicoWriteS68k16_bram(u32 a, u32 d)
- {
- elprintf(EL_ANOMALY, "s68k_bram w16: [%06x] %04x @%06x", a, d, SekPcS68k);
- a = (a >> 1) & 0x1fff;
- Pico_mcd->bram[a++] = d;
- Pico_mcd->bram[a++] = d >> 8; // TODO: verify..
- SRam.changed = 1;
- }
- #ifndef _ASM_CD_MEMORY_C
- // PCM and registers (ff0000 - ffffff)
- static u32 PicoReadS68k8_pr(u32 a)
- {
- u32 d = 0;
- // regs
- if ((a & 0xfe00) == 0x8000) {
- a &= 0x1ff;
- elprintf(EL_CDREGS, "s68k_regs r8: [%02x] @ %06x", a, SekPcS68k);
- if (a >= 0x0e && a < 0x30) {
- d = Pico_mcd->s68k_regs[a];
- s68k_poll_detect(a, d);
- elprintf(EL_CDREGS, "ret = %02x", (u8)d);
- return d;
- }
- else if (a >= 0x58 && a < 0x68)
- d = gfx_cd_read(a & ~1);
- else d = s68k_reg_read16(a & ~1);
- if (!(a & 1))
- d >>= 8;
- elprintf(EL_CDREGS, "ret = %02x", (u8)d);
- return d & 0xff;
- }
- // PCM
- // XXX: verify: probably odd addrs only?
- if ((a & 0x8000) == 0x0000) {
- a &= 0x7fff;
- if (a >= 0x2000)
- d = Pico_mcd->pcm_ram_b[Pico_mcd->pcm.bank][(a >> 1) & 0xfff];
- else if (a >= 0x20) {
- a &= 0x1e;
- d = Pico_mcd->pcm.ch[a>>2].addr >> PCM_STEP_SHIFT;
- if (a & 2)
- d >>= 8;
- }
- return d & 0xff;
- }
- return s68k_unmapped_read8(a);
- }
- static u32 PicoReadS68k16_pr(u32 a)
- {
- u32 d = 0;
- // regs
- if ((a & 0xfe00) == 0x8000) {
- a &= 0x1fe;
- elprintf(EL_CDREGS, "s68k_regs r16: [%02x] @ %06x", a, SekPcS68k);
- if (0x58 <= a && a < 0x68)
- d = gfx_cd_read(a);
- else d = s68k_reg_read16(a);
- elprintf(EL_CDREGS, "ret = %04x", d);
- return d;
- }
- // PCM
- if ((a & 0x8000) == 0x0000) {
- //elprintf(EL_ANOMALY, "FIXME: s68k_pcm r16: [%06x] @%06x", a, SekPcS68k);
- a &= 0x7fff;
- if (a >= 0x2000)
- d = Pico_mcd->pcm_ram_b[Pico_mcd->pcm.bank][(a>>1)&0xfff];
- else if (a >= 0x20) {
- a &= 0x1e;
- d = Pico_mcd->pcm.ch[a>>2].addr >> PCM_STEP_SHIFT;
- if (a & 2) d >>= 8;
- }
- elprintf(EL_CDREGS, "ret = %04x", d);
- return d;
- }
- return s68k_unmapped_read16(a);
- }
- static void PicoWriteS68k8_pr(u32 a, u32 d)
- {
- // regs
- if ((a & 0xfe00) == 0x8000) {
- a &= 0x1ff;
- elprintf(EL_CDREGS, "s68k_regs w8: [%02x] %02x @ %06x", a, d, SekPcS68k);
- if (0x58 <= a && a < 0x68)
- gfx_cd_write16(a&~1, (d<<8)|d);
- else s68k_reg_write8(a,d);
- return;
- }
- // PCM
- if ((a & 0x8000) == 0x0000) {
- a &= 0x7fff;
- if (a >= 0x2000)
- Pico_mcd->pcm_ram_b[Pico_mcd->pcm.bank][(a>>1)&0xfff] = d;
- else if (a < 0x12)
- pcm_write(a>>1, d);
- return;
- }
- s68k_unmapped_write8(a, d);
- }
- static void PicoWriteS68k16_pr(u32 a, u32 d)
- {
- // regs
- if ((a & 0xfe00) == 0x8000) {
- a &= 0x1fe;
- elprintf(EL_CDREGS, "s68k_regs w16: [%02x] %04x @ %06x", a, d, SekPcS68k);
- if (a >= 0x58 && a < 0x68)
- gfx_cd_write16(a, d);
- else {
- if (a == 0xe) {
- // special case, 2 byte writes would be handled differently
- // TODO: verify
- Pico_mcd->s68k_regs[0xf] = d;
- return;
- }
- s68k_reg_write8(a, d >> 8);
- s68k_reg_write8(a + 1, d & 0xff);
- }
- return;
- }
- // PCM
- if ((a & 0x8000) == 0x0000) {
- a &= 0x7fff;
- if (a >= 0x2000)
- Pico_mcd->pcm_ram_b[Pico_mcd->pcm.bank][(a>>1)&0xfff] = d;
- else if (a < 0x12)
- pcm_write(a>>1, d & 0xff);
- return;
- }
- s68k_unmapped_write16(a, d);
- }
- #endif
- static const void *m68k_cell_read8[] = { PicoReadM68k8_cell0, PicoReadM68k8_cell1 };
- static const void *m68k_cell_read16[] = { PicoReadM68k16_cell0, PicoReadM68k16_cell1 };
- static const void *m68k_cell_write8[] = { PicoWriteM68k8_cell0, PicoWriteM68k8_cell1 };
- static const void *m68k_cell_write16[] = { PicoWriteM68k16_cell0, PicoWriteM68k16_cell1 };
- static const void *s68k_dec_read8[] = { PicoReadS68k8_dec0, PicoReadS68k8_dec1 };
- static const void *s68k_dec_read16[] = { PicoReadS68k16_dec0, PicoReadS68k16_dec1 };
- static const void *s68k_dec_write8[2][4] = {
- { PicoWriteS68k8_dec_m0b0, PicoWriteS68k8_dec_m1b0, PicoWriteS68k8_dec_m2b0, PicoWriteS68k8_dec_m2b0 },
- { PicoWriteS68k8_dec_m0b1, PicoWriteS68k8_dec_m1b1, PicoWriteS68k8_dec_m2b1, PicoWriteS68k8_dec_m2b1 },
- };
- static const void *s68k_dec_write16[2][4] = {
- { PicoWriteS68k16_dec_m0b0, PicoWriteS68k16_dec_m1b0, PicoWriteS68k16_dec_m2b0, PicoWriteS68k16_dec_m2b0 },
- { PicoWriteS68k16_dec_m0b1, PicoWriteS68k16_dec_m1b1, PicoWriteS68k16_dec_m2b1, PicoWriteS68k16_dec_m2b1 },
- };
- // -----------------------------------------------------------------
- static void remap_prg_window(void)
- {
- // PRG RAM
- if (Pico_mcd->m.busreq & 2) {
- void *bank = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3] >> 6];
- cpu68k_map_all_ram(0x020000, 0x03ffff, bank, 0);
- }
- else {
- m68k_map_unmap(0x020000, 0x03ffff);
- }
- }
- static void remap_word_ram(int r3)
- {
- void *bank;
- // WORD RAM
- if (!(r3 & 4)) {
- // 2M mode. XXX: allowing access in all cases for simplicity
- bank = Pico_mcd->word_ram2M;
- cpu68k_map_all_ram(0x200000, 0x23ffff, bank, 0);
- cpu68k_map_all_ram(0x080000, 0x0bffff, bank, 1);
- // TODO: handle 0x0c0000
- }
- else {
- int b0 = r3 & 1;
- int m = (r3 & 0x18) >> 3;
- bank = Pico_mcd->word_ram1M[b0];
- cpu68k_map_all_ram(0x200000, 0x21ffff, bank, 0);
- bank = Pico_mcd->word_ram1M[b0 ^ 1];
- cpu68k_map_all_ram(0x0c0000, 0x0effff, bank, 1);
- // "cell arrange" on m68k
- cpu68k_map_set(m68k_read8_map, 0x220000, 0x23ffff, m68k_cell_read8[b0], 1);
- cpu68k_map_set(m68k_read16_map, 0x220000, 0x23ffff, m68k_cell_read16[b0], 1);
- cpu68k_map_set(m68k_write8_map, 0x220000, 0x23ffff, m68k_cell_write8[b0], 1);
- cpu68k_map_set(m68k_write16_map, 0x220000, 0x23ffff, m68k_cell_write16[b0], 1);
- // "decode format" on s68k
- cpu68k_map_set(s68k_read8_map, 0x080000, 0x0bffff, s68k_dec_read8[b0 ^ 1], 1);
- cpu68k_map_set(s68k_read16_map, 0x080000, 0x0bffff, s68k_dec_read16[b0 ^ 1], 1);
- cpu68k_map_set(s68k_write8_map, 0x080000, 0x0bffff, s68k_dec_write8[b0 ^ 1][m], 1);
- cpu68k_map_set(s68k_write16_map, 0x080000, 0x0bffff, s68k_dec_write16[b0 ^ 1][m], 1);
- }
- #ifdef EMU_F68K
- // update fetchmap..
- int i;
- if (!(r3 & 4))
- {
- for (i = M68K_FETCHBANK1*2/16; (i<<(24-FAMEC_FETCHBITS)) < 0x240000; i++)
- PicoCpuFM68k.Fetch[i] = (unsigned int)Pico_mcd->word_ram2M - 0x200000;
- }
- else
- {
- for (i = M68K_FETCHBANK1*2/16; (i<<(24-FAMEC_FETCHBITS)) < 0x220000; i++)
- PicoCpuFM68k.Fetch[i] = (unsigned int)Pico_mcd->word_ram1M[r3 & 1] - 0x200000;
- for (i = M68K_FETCHBANK1*0x0c/0x100; (i<<(24-FAMEC_FETCHBITS)) < 0x0e0000; i++)
- PicoCpuFS68k.Fetch[i] = (unsigned int)Pico_mcd->word_ram1M[(r3&1)^1] - 0x0c0000;
- }
- #endif
- }
- void PicoMemStateLoaded(void)
- {
- int r3 = Pico_mcd->s68k_regs[3];
- /* after load events */
- if (r3 & 4) // 1M mode?
- wram_2M_to_1M(Pico_mcd->word_ram2M);
- remap_word_ram(r3);
- remap_prg_window();
- // restore hint vector
- *(unsigned short *)(Pico_mcd->bios + 0x72) = Pico_mcd->m.hint_vector;
- }
- #ifdef EMU_M68K
- static void m68k_mem_setup_cd(void);
- #endif
- PICO_INTERNAL void PicoMemSetupCD(void)
- {
- // setup default main68k map
- PicoMemSetup();
- // main68k map (BIOS mapped by PicoMemSetup()):
- // RAM cart
- if (PicoOpt & POPT_EN_MCD_RAMCART) {
- cpu68k_map_set(m68k_read8_map, 0x400000, 0x7fffff, PicoReadM68k8_ramc, 1);
- cpu68k_map_set(m68k_read16_map, 0x400000, 0x7fffff, PicoReadM68k16_ramc, 1);
- cpu68k_map_set(m68k_write8_map, 0x400000, 0x7fffff, PicoWriteM68k8_ramc, 1);
- cpu68k_map_set(m68k_write16_map, 0x400000, 0x7fffff, PicoWriteM68k16_ramc, 1);
- }
- // registers/IO:
- cpu68k_map_set(m68k_read8_map, 0xa10000, 0xa1ffff, PicoReadM68k8_io, 1);
- cpu68k_map_set(m68k_read16_map, 0xa10000, 0xa1ffff, PicoReadM68k16_io, 1);
- cpu68k_map_set(m68k_write8_map, 0xa10000, 0xa1ffff, PicoWriteM68k8_io, 1);
- cpu68k_map_set(m68k_write16_map, 0xa10000, 0xa1ffff, PicoWriteM68k16_io, 1);
- // sub68k map
- cpu68k_map_set(s68k_read8_map, 0x000000, 0xffffff, s68k_unmapped_read8, 1);
- cpu68k_map_set(s68k_read16_map, 0x000000, 0xffffff, s68k_unmapped_read16, 1);
- cpu68k_map_set(s68k_write8_map, 0x000000, 0xffffff, s68k_unmapped_write8, 1);
- cpu68k_map_set(s68k_write16_map, 0x000000, 0xffffff, s68k_unmapped_write16, 1);
- // PRG RAM
- cpu68k_map_set(s68k_read8_map, 0x000000, 0x07ffff, Pico_mcd->prg_ram, 0);
- cpu68k_map_set(s68k_read16_map, 0x000000, 0x07ffff, Pico_mcd->prg_ram, 0);
- cpu68k_map_set(s68k_write8_map, 0x000000, 0x07ffff, Pico_mcd->prg_ram, 0);
- cpu68k_map_set(s68k_write16_map, 0x000000, 0x07ffff, Pico_mcd->prg_ram, 0);
- cpu68k_map_set(s68k_write8_map, 0x000000, 0x00ffff, PicoWriteS68k8_prgwp, 1);
- cpu68k_map_set(s68k_write16_map, 0x000000, 0x00ffff, PicoWriteS68k16_prgwp, 1);
- // BRAM
- cpu68k_map_set(s68k_read8_map, 0xfe0000, 0xfeffff, PicoReadS68k8_bram, 1);
- cpu68k_map_set(s68k_read16_map, 0xfe0000, 0xfeffff, PicoReadS68k16_bram, 1);
- cpu68k_map_set(s68k_write8_map, 0xfe0000, 0xfeffff, PicoWriteS68k8_bram, 1);
- cpu68k_map_set(s68k_write16_map, 0xfe0000, 0xfeffff, PicoWriteS68k16_bram, 1);
- // PCM, regs
- cpu68k_map_set(s68k_read8_map, 0xff0000, 0xffffff, PicoReadS68k8_pr, 1);
- cpu68k_map_set(s68k_read16_map, 0xff0000, 0xffffff, PicoReadS68k16_pr, 1);
- cpu68k_map_set(s68k_write8_map, 0xff0000, 0xffffff, PicoWriteS68k8_pr, 1);
- cpu68k_map_set(s68k_write16_map, 0xff0000, 0xffffff, PicoWriteS68k16_pr, 1);
- // RAMs
- remap_word_ram(1);
- #ifdef EMU_C68K
- // s68k
- PicoCpuCS68k.read8 = (void *)s68k_read8_map;
- PicoCpuCS68k.read16 = (void *)s68k_read16_map;
- PicoCpuCS68k.read32 = (void *)s68k_read16_map;
- PicoCpuCS68k.write8 = (void *)s68k_write8_map;
- PicoCpuCS68k.write16 = (void *)s68k_write16_map;
- PicoCpuCS68k.write32 = (void *)s68k_write16_map;
- PicoCpuCS68k.checkpc = NULL; /* unused */
- PicoCpuCS68k.fetch8 = NULL;
- PicoCpuCS68k.fetch16 = NULL;
- PicoCpuCS68k.fetch32 = NULL;
- #endif
- #ifdef EMU_F68K
- // s68k
- PicoCpuFS68k.read_byte = s68k_read8;
- PicoCpuFS68k.read_word = s68k_read16;
- PicoCpuFS68k.read_long = s68k_read32;
- PicoCpuFS68k.write_byte = s68k_write8;
- PicoCpuFS68k.write_word = s68k_write16;
- PicoCpuFS68k.write_long = s68k_write32;
- // setup FAME fetchmap
- {
- int i;
- // M68k
- // by default, point everything to fitst 64k of ROM (BIOS)
- for (i = 0; i < M68K_FETCHBANK1; i++)
- PicoCpuFM68k.Fetch[i] = (unsigned int)Pico.rom - (i<<(24-FAMEC_FETCHBITS));
- // now real ROM (BIOS)
- for (i = 0; i < M68K_FETCHBANK1 && (i<<(24-FAMEC_FETCHBITS)) < Pico.romsize; i++)
- PicoCpuFM68k.Fetch[i] = (unsigned int)Pico.rom;
- // .. and RAM
- for (i = M68K_FETCHBANK1*14/16; i < M68K_FETCHBANK1; i++)
- PicoCpuFM68k.Fetch[i] = (unsigned int)Pico.ram - (i<<(24-FAMEC_FETCHBITS));
- // S68k
- // PRG RAM is default
- for (i = 0; i < M68K_FETCHBANK1; i++)
- PicoCpuFS68k.Fetch[i] = (unsigned int)Pico_mcd->prg_ram - (i<<(24-FAMEC_FETCHBITS));
- // real PRG RAM
- for (i = 0; i < M68K_FETCHBANK1 && (i<<(24-FAMEC_FETCHBITS)) < 0x80000; i++)
- PicoCpuFS68k.Fetch[i] = (unsigned int)Pico_mcd->prg_ram;
- // WORD RAM 2M area
- for (i = M68K_FETCHBANK1*0x08/0x100; i < M68K_FETCHBANK1 && (i<<(24-FAMEC_FETCHBITS)) < 0xc0000; i++)
- PicoCpuFS68k.Fetch[i] = (unsigned int)Pico_mcd->word_ram2M - 0x80000;
- // remap_word_ram() will setup word ram for both
- }
- #endif
- #ifdef EMU_M68K
- m68k_mem_setup_cd();
- #endif
- // m68k_poll_addr = m68k_poll_cnt = 0;
- s68k_poll_adclk = s68k_poll_cnt = 0;
- }
- #ifdef EMU_M68K
- u32 m68k_read8(u32 a);
- u32 m68k_read16(u32 a);
- u32 m68k_read32(u32 a);
- void m68k_write8(u32 a, u8 d);
- void m68k_write16(u32 a, u16 d);
- void m68k_write32(u32 a, u32 d);
- static unsigned int PicoReadCD8w (unsigned int a) {
- return m68ki_cpu_p == &PicoCpuMS68k ? s68k_read8(a) : m68k_read8(a);
- }
- static unsigned int PicoReadCD16w(unsigned int a) {
- return m68ki_cpu_p == &PicoCpuMS68k ? s68k_read16(a) : m68k_read16(a);
- }
- static unsigned int PicoReadCD32w(unsigned int a) {
- return m68ki_cpu_p == &PicoCpuMS68k ? s68k_read32(a) : m68k_read32(a);
- }
- static void PicoWriteCD8w (unsigned int a, unsigned char d) {
- if (m68ki_cpu_p == &PicoCpuMS68k) s68k_write8(a, d); else m68k_write8(a, d);
- }
- static void PicoWriteCD16w(unsigned int a, unsigned short d) {
- if (m68ki_cpu_p == &PicoCpuMS68k) s68k_write16(a, d); else m68k_write16(a, d);
- }
- static void PicoWriteCD32w(unsigned int a, unsigned int d) {
- if (m68ki_cpu_p == &PicoCpuMS68k) s68k_write32(a, d); else m68k_write32(a, d);
- }
- extern unsigned int (*pm68k_read_memory_8) (unsigned int address);
- extern unsigned int (*pm68k_read_memory_16)(unsigned int address);
- extern unsigned int (*pm68k_read_memory_32)(unsigned int address);
- extern void (*pm68k_write_memory_8) (unsigned int address, unsigned char value);
- extern void (*pm68k_write_memory_16)(unsigned int address, unsigned short value);
- extern void (*pm68k_write_memory_32)(unsigned int address, unsigned int value);
- static void m68k_mem_setup_cd(void)
- {
- pm68k_read_memory_8 = PicoReadCD8w;
- pm68k_read_memory_16 = PicoReadCD16w;
- pm68k_read_memory_32 = PicoReadCD32w;
- pm68k_write_memory_8 = PicoWriteCD8w;
- pm68k_write_memory_16 = PicoWriteCD16w;
- pm68k_write_memory_32 = PicoWriteCD32w;
- }
- #endif // EMU_M68K
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