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picodrive/pico/cd/memory.c

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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"
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];
#ifndef _ASM_CD_MEMORY_C
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)
#endif
// -----------------------------------------------------------------
// provided by ASM code:
#ifdef _ASM_CD_MEMORY_C
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(u32 r1, u32 r3);
static void remap_word_ram(u32 r3);
// poller detection
#define POLL_LIMIT 16
#define POLL_CYCLES 64
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) {
// there are cases when slave updates comm and only switches RAM
// over after that (mcd1b), so there must be a resync..
SekEndRun(64);
Pico_mcd->m.need_sync = 1;
}
Pico_mcd->m.m68k_poll_clk = cycles;
if (SekNotPolling || a != Pico_mcd->m.m68k_poll_a || clkdiff > POLL_CYCLES || clkdiff <= 16) {
Pico_mcd->m.m68k_poll_a = a;
Pico_mcd->m.m68k_poll_cnt = 0;
SekNotPolling = 0;
return;
}
Pico_mcd->m.m68k_poll_cnt++;
if(Pico_mcd->m.m68k_poll_cnt == POLL_LIMIT)
SekEndRun(0);
}
#ifndef _ASM_CD_MEMORY_C
static u32 m68k_reg_read16(u32 a)
{
u32 d = 0;
a &= 0x3e;
switch (a) {
case 0:
// here IFL2 is always 0, just like in Gens
d = ((Pico_mcd->s68k_regs[0x33] << 13) & 0x8000)
| Pico_mcd->m.busreq;
goto end;
case 2:
m68k_comm_check(a);
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 = cdc_host_r();
goto end;
case 0xA:
elprintf(EL_UIO, "m68k FIXME: reserved read");
goto end;
case 0xC: // 384 cycle stopwatch timer
// ugh..
d = pcd_cycles_m68k_to_s68k(SekCyclesDone());
d = (d - Pico_mcd->m.stopwatch_base_c) / 384;
d &= 0x0fff;
elprintf(EL_CDREGS, "m68k stopwatch timer read (%04x)", d);
goto end;
}
if (a < 0x30) {
// comm flag/cmd/status (0xE-0x2F)
m68k_comm_check(a);
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;
Pico_mcd->m.m68k_poll_cnt = 0;
switch (a) {
case 0:
d &= 1;
if (d && (Pico_mcd->s68k_regs[0x33] & PCDS_IEN2)) {
elprintf(EL_INTS, "m68k: s68k irq 2");
pcd_sync_s68k(SekCyclesDone(), 0);
pcd_irq_s68k(2, 1);
}
return;
case 1:
d &= 3;
dold = Pico_mcd->m.busreq;
if (!(d & 1))
d |= 2; // verified: can't release bus on reset
if (dold == d)
return;
pcd_sync_s68k(SekCyclesDone(), 0);
if ((dold ^ d) & 1)
elprintf(EL_INTSW, "m68k: s68k reset %i", !(d&1));
if (!(d & 1))
Pico_mcd->m.state_flags |= PCD_ST_S68K_RST;
else if (d == 1 && (Pico_mcd->m.state_flags & PCD_ST_S68K_RST)) {
Pico_mcd->m.state_flags &= ~PCD_ST_S68K_RST;
elprintf(EL_CDREGS, "m68k: resetting s68k");
SekResetS68k();
}
if ((dold ^ d) & 2) {
elprintf(EL_INTSW, "m68k: s68k brq %i", d >> 1);
remap_prg_window(d, Pico_mcd->s68k_regs[3]);
}
Pico_mcd->m.busreq = d;
return;
case 2:
elprintf(EL_CDREGS, "m68k: prg wp=%02x", d);
goto write_comm;
case 3:
dold = Pico_mcd->s68k_regs[3];
elprintf(EL_CDREG3, "m68k_regs w3: %02x @%06x", (u8)d, SekPc);
if ((d ^ dold) & 0xc0) {
elprintf(EL_CDREGS, "m68k: prg bank: %i -> %i",
(Pico_mcd->s68k_regs[a]>>6), ((d>>6)&3));
remap_prg_window(Pico_mcd->m.busreq, d);
}
// 2M mode state is tracked regardless of current mode
if (d & 2) {
Pico_mcd->m.dmna_ret_2m |= 2;
Pico_mcd->m.dmna_ret_2m &= ~1;
}
if (dold & 4) { // 1M mode
d ^= 2; // 0 sets DMNA, 1 does nothing
d = (d & 0xc2) | (dold & 0x1f);
}
else
d = (d & 0xc0) | (dold & 0x1c) | Pico_mcd->m.dmna_ret_2m;
goto write_comm;
case 6:
Pico_mcd->bios[MEM_BE2(0x72)] = d; // simple hint vector changer
return;
case 7:
Pico_mcd->bios[MEM_BE2(0x73)] = d;
elprintf(EL_CDREGS, "hint vector set to %04x%04x",
((u16 *)Pico_mcd->bios)[0x70/2], ((u16 *)Pico_mcd->bios)[0x72/2]);
return;
case 0x0f:
a = 0x0e;
case 0x0e:
goto write_comm;
}
if ((a&0xf0) == 0x10)
goto write_comm;
elprintf(EL_UIO, "m68k FIXME: invalid write? [%02x] %02x", a, d);
return;
write_comm:
if (d == Pico_mcd->s68k_regs[a])
return;
pcd_sync_s68k(SekCyclesDone(), 0);
Pico_mcd->s68k_regs[a] = d;
if (a == 0x03) {
// There are cases when master checks for successful switching of RAM to
// 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;
}
if (Pico_mcd->m.s68k_poll_a == (a & ~1))
{
if (Pico_mcd->m.s68k_poll_cnt > POLL_LIMIT) {
elprintf(EL_CDPOLL, "s68k poll release, a=%02x", a);
SekSetStopS68k(0);
}
Pico_mcd->m.s68k_poll_a = 0;
}
}
u32 s68k_poll_detect(u32 a, u32 d)
{
#ifdef USE_POLL_DETECT
u32 cycles, cnt = 0;
if (SekIsStoppedS68k())
return d;
cycles = SekCyclesDoneS68k();
if (!SekNotPollingS68k && a == Pico_mcd->m.s68k_poll_a) {
u32 clkdiff = cycles - Pico_mcd->m.s68k_poll_clk;
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) {
SekSetStopS68k(1);
elprintf(EL_CDPOLL, "s68k poll detected @%06x, a=%02x",
SekPcS68k, a);
}
}
}
Pico_mcd->m.s68k_poll_a = a;
Pico_mcd->m.s68k_poll_clk = cycles;
Pico_mcd->m.s68k_poll_cnt = cnt;
SekNotPollingS68k = 0;
#endif
return d;
}
#define READ_FONT_DATA(basemask) \
{ \
unsigned int fnt = CPU_LE4(*(u32 *)(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_reg_r();
case 8:
return cdc_host_r();
case 0xC:
d = SekCyclesDoneS68k() - Pico_mcd->m.stopwatch_base_c;
d /= 384;
d &= 0x0fff;
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 1:
if (!(d & 1))
pcd_soft_reset();
return;
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;
// 2M mode state
if (d & 1) {
Pico_mcd->m.dmna_ret_2m |= 1;
Pico_mcd->m.dmna_ret_2m &= ~2; // DMNA clears
}
if (d & 4)
{
if (!(dold & 4)) {
elprintf(EL_CDREG3, "wram mode 2M->1M");
wram_2M_to_1M(Pico_mcd->word_ram2M);
}
if ((d ^ dold) & 0x1d)
remap_word_ram(d);
if ((d ^ dold) & 0x05)
d &= ~2; // clear DMNA - swap complete
}
else
{
if (dold & 4) {
elprintf(EL_CDREG3, "wram mode 1M->2M");
wram_1M_to_2M(Pico_mcd->word_ram2M);
remap_word_ram(d);
}
d = (d & ~3) | Pico_mcd->m.dmna_ret_2m;
}
goto write_comm;
}
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_reg_w(d & 0xff);
return;
case 0xa:
elprintf(EL_CDREGS, "s68k set CDC dma addr");
break;
case 0xc:
case 0xd: // 384 cycle stopwatch timer
elprintf(EL_CDREGS|EL_CD, "s68k clear stopwatch (%x)", d);
// does this also reset internal 384 cycle counter?
Pico_mcd->m.stopwatch_base_c = SekCyclesDoneS68k();
return;
case 0x0e:
a = 0x0f;
case 0x0f:
goto write_comm;
case 0x31: // 384 cycle int3 timer
d &= 0xff;
elprintf(EL_CDREGS|EL_CD, "s68k set int3 timer: %02x", d);
Pico_mcd->s68k_regs[a] = (u8) d;
if (d) // d or d+1??
pcd_event_schedule_s68k(PCD_EVENT_TIMER3, d * 384);
else
pcd_event_schedule(0, PCD_EVENT_TIMER3, 0);
break;
case 0x33: // IRQ mask
elprintf(EL_CDREGS|EL_CD, "s68k irq mask: %02x", d);
d &= 0x7e;
if ((d ^ Pico_mcd->s68k_regs[0x33]) & d & PCDS_IEN4) {
// XXX: emulate pending irq instead?
if (Pico_mcd->s68k_regs[0x37] & 4) {
elprintf(EL_INTS, "cdd export irq 4 (unmask)");
pcd_irq_s68k(4, 1);
}
}
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)) {
// ??
pcd_event_schedule_s68k(PCD_EVENT_CDC, 12500000/75);
if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN4) {
elprintf(EL_INTS, "cdd export irq 4");
pcd_irq_s68k(4, 1);
}
}
return;
}
case 0x4b:
Pico_mcd->s68k_regs[a] = 0; // (u8) d; ?
cdd_process();
{
static const char *nm[] =
{ "stat", "stop", "read_toc", "play",
"seek", "???", "pause", "resume",
"ff", "fr", "tjump", "???",
"close","open", "???", "???" };
u8 *c = &Pico_mcd->s68k_regs[0x42];
u8 *s = &Pico_mcd->s68k_regs[0x38];
elprintf(EL_CD,
"CDD command: %02x %02x %02x %02x %02x %02x %02x %02x %12s",
c[0], c[1], c[2], c[3], c[4], c[5], c[6], c[7], nm[c[0] & 0x0f]);
elprintf(EL_CD,
"CDD status: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
s[0], s[1], s[2], s[3], s[4], s[5], s[6], s[7], s[8], s[9]);
}
return;
case 0x58:
return;
}
if ((a&0x1f0) == 0x20)
goto write_comm;
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;
return;
write_comm:
Pico_mcd->s68k_regs[a] = (u8) d;
if (Pico_mcd->m.m68k_poll_cnt)
SekEndRunS68k(0);
Pico_mcd->m.m68k_poll_cnt = 0;
}
void s68k_reg_write16(u32 a, u32 d)
{
u8 *r = Pico_mcd->s68k_regs;
Pico_mcd->m.s68k_poll_cnt = 0;
if ((a & 0x1f0) == 0x20)
goto write_comm;
switch (a) {
case 0x0e:
// special case, 2 byte writes would be handled differently
// TODO: verify
d = (u8)d | (r[0xe] << 8);
goto write_comm;
case 0x58: // stamp data size
r[0x59] = d & 7;
return;
case 0x5a: // stamp map base address
r[0x5a] = d >> 8;
r[0x5b] = d & 0xe0;
return;
case 0x5c: // V cell size
r[0x5d] = d & 0x1f;
return;
case 0x5e: // image buffer start address
r[0x5e] = d >> 8;
r[0x5f] = d & 0xf8;
return;
case 0x60: // image buffer offset
r[0x61] = d & 0x3f;
return;
case 0x62: // h dot size
r[0x62] = (d >> 8) & 1;
r[0x63] = d;
return;
case 0x64: // v dot size
r[0x65] = d;
return;
case 0x66: // trace vector base address
d &= 0xfffe;
r[0x66] = d >> 8;
r[0x67] = d;
gfx_start(d);
return;
default:
break;
}
s68k_reg_write8(a, d >> 8);
s68k_reg_write8(a + 1, d & 0xff);
return;
write_comm:
r[a] = d >> 8;
r[a + 1] = d;
if (Pico_mcd->m.m68k_poll_cnt)
SekEndRunS68k(0);
Pico_mcd->m.m68k_poll_cnt = 0;
}
// -----------------------------------------------------------------
// 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][MEM_BE2(a)];
}
static u32 PicoReadM68k8_cell1(u32 a)
{
a = (a&3) | (cell_map(a >> 2) << 2);
return Pico_mcd->word_ram1M[1][MEM_BE2(a)];
}
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][MEM_BE2(a)] = d;
}
static void PicoWriteM68k8_cell1(u32 a, u32 d)
{
a = (a&3) | (cell_map(a >> 2) << 2);
Pico_mcd->word_ram1M[1][MEM_BE2(a)] = 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 (Pico.sv.data != NULL)
d = 3; // 64k cart
return d;
}
if ((a & 0xfe0000) == 0x600000) {
if (Pico.sv.data != NULL)
d = Pico.sv.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 (Pico.sv.data != NULL && (Pico_mcd->m.bcram_reg & 1)) {
Pico.sv.data[((a>>1) & 0xffff) + 0x2000] = d;
Pico.sv.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
u32 PicoRead8_mcd_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);
}
u32 PicoRead16_mcd_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);
}
void PicoWrite8_mcd_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;
}
PicoWrite8_io(a, d);
}
void PicoWrite16_mcd_io(u32 a, u32 d)
{
if ((a & 0xff00) == 0x2000) { // a12000 - a120ff
elprintf(EL_CDREGS, "m68k_regs w16: [%02x] %04x @%06x",
a & 0x3f, d, SekPc);
m68k_reg_write8(a, d >> 8);
if ((a & 0x3e) != 0x0e) // special case
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 - 01fdff)?
// XXX verify: ff00 or 1fe00 max?
static void PicoWriteS68k8_prgwp(u32 a, u32 d)
{
if (a >= (Pico_mcd->s68k_regs[2] << 9))
Pico_mcd->prg_ram[MEM_BE2(a)] = d;
}
static void PicoWriteS68k16_prgwp(u32 a, u32 d)
{
if (a >= (Pico_mcd->s68k_regs[2] << 9))
*(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][MEM_BE2(a >> 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][MEM_BE2(a >> 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][MEM_BE2(a >> 1) & 0x1ffff];
d |= d << 4;
d &= ~0xf0;
return d;
}
static u32 PicoReadS68k16_dec1(u32 a)
{
u32 d = Pico_mcd->word_ram1M[1][MEM_BE2(a >> 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][MEM_BE2(a >> 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][MEM_BE2(a >> 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][MEM_BE2(a >> 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][MEM_BE2(a >> 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][MEM_BE2(a >> 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;
Pico.sv.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..
Pico.sv.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;
if (a >= 0x0e && a < 0x30) {
d = Pico_mcd->s68k_regs[a];
s68k_poll_detect(a & ~1, d);
goto regs_done;
}
d = s68k_reg_read16(a & ~1);
if (!(a & 1))
d >>= 8;
regs_done:
d &= 0xff;
elprintf(EL_CDREGS, "s68k_regs r8: [%02x] %02x @%06x",
a, d, SekPcS68k);
return d;
}
// 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)
d = pcd_pcm_read(a >> 1);
return d;
}
return s68k_unmapped_read8(a);
}
static u32 PicoReadS68k16_pr(u32 a)
{
u32 d = 0;
// regs
if ((a & 0xfe00) == 0x8000) {
a &= 0x1fe;
d = s68k_reg_read16(a);
elprintf(EL_CDREGS, "s68k_regs r16: [%02x] %04x @%06x",
a, d, SekPcS68k);
return d;
}
// PCM
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)
d = pcd_pcm_read(a >> 1);
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 (0x59 <= a && a < 0x68) // word regs
s68k_reg_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)
pcd_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);
s68k_reg_write16(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)
pcd_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(u32 r1, u32 r3)
{
// PRG RAM
if (r1 & 2) {
void *bank = Pico_mcd->prg_ram_b[(r3 >> 6) & 3];
cpu68k_map_all_ram(0x020000, 0x03ffff, bank, 0);
}
else {
m68k_map_unmap(0x020000, 0x03ffff);
}
}
static void remap_word_ram(u32 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);
}
}
void pcd_state_loaded_mem(void)
{
u32 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(Pico_mcd->m.busreq, r3);
Pico_mcd->m.dmna_ret_2m &= 3;
// restore hint vector
*(u16 *)(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 (PicoIn.opt & 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, PicoRead8_mcd_io, 1);
cpu68k_map_set(m68k_read16_map, 0xa10000, 0xa1ffff, PicoRead16_mcd_io, 1);
cpu68k_map_set(m68k_write8_map, 0xa10000, 0xa1ffff, PicoWrite8_mcd_io, 1);
cpu68k_map_set(m68k_write16_map, 0xa10000, 0xa1ffff, PicoWrite16_mcd_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, 0x01ffff, PicoWriteS68k8_prgwp, 1);
cpu68k_map_set(s68k_write16_map, 0x000000, 0x01ffff, 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 = (void *)s68k_read8;
PicoCpuFS68k.read_word = (void *)s68k_read16;
PicoCpuFS68k.read_long = (void *)s68k_read32;
PicoCpuFS68k.write_byte = (void *)s68k_write8;
PicoCpuFS68k.write_word = (void *)s68k_write16;
PicoCpuFS68k.write_long = (void *)s68k_write32;
// setup FAME fetchmap
{
#ifdef __clang__
volatile // prevent strange relocs from clang
#endif
unsigned long ptr_ram = (uptr)PicoMem.ram;
int i;
// M68k
// by default, point everything to fitst 64k of ROM (BIOS)
for (i = 0; i < M68K_FETCHBANK1; i++)
PicoCpuFM68k.Fetch[i] = (uptr)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] = (uptr)Pico.rom;
// .. and RAM
for (i = M68K_FETCHBANK1*14/16; i < M68K_FETCHBANK1; i++)
PicoCpuFM68k.Fetch[i] = ptr_ram - (i<<(24-FAMEC_FETCHBITS));
// S68k
// PRG RAM is default
for (i = 0; i < M68K_FETCHBANK1; i++)
PicoCpuFS68k.Fetch[i] = (uptr)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] = (uptr)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] = (uptr)Pico_mcd->word_ram2M - 0x80000;
// remap_word_ram() will setup word ram for both
}
#endif
#ifdef EMU_M68K
m68k_mem_setup_cd();
#endif
}
#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
// vim:shiftwidth=2:ts=2:expandtab
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