struct Pico32xMem *Pico32xMem;
+static void bank_switch(int b);
+
+#define MSB8(x) ((x) >> 8)
+
// SH2 faking
+#define FAKE_SH2
+int p32x_csum_faked;
+#ifdef FAKE_SH2
static const u16 comm_fakevals[] = {
0x4d5f, 0x4f4b, // M_OK
0x535f, 0x4f4b, // S_OK
+ 0x4D41, 0x5346, // MASF - Brutal Unleashed
+ 0x5331, 0x4d31, // Darxide
+ 0x5332, 0x4d32,
+ 0x5333, 0x4d33,
+ 0x0000, 0x0000, // eq for doom
0x0002, // Mortal Kombat
- 0, // pad
+// 0, // pad
};
+static u32 sh2_comm_faker(u32 a)
+{
+ static int f = 0;
+ if (a == 0x28 && !p32x_csum_faked) {
+ p32x_csum_faked = 1;
+ return *(unsigned short *)(Pico.rom + 0x18e);
+ }
+ if (f >= sizeof(comm_fakevals) / sizeof(comm_fakevals[0]))
+ f = 0;
+ return comm_fakevals[f++];
+}
+#endif
+
static u32 p32x_reg_read16(u32 a)
{
a &= 0x3e;
- // SH2 faker
+#ifdef FAKE_SH2
if ((a & 0x30) == 0x20)
- {
- static int f = 0, csum_faked = 0;
- if (a == 0x28 && !csum_faked) {
- csum_faked = 1;
- return *(unsigned short *)(Pico.rom + 0x18e);
- }
- if (f >= sizeof(comm_fakevals) / sizeof(comm_fakevals[0]))
- f = 0;
- return comm_fakevals[f++];
- }
+ return sh2_comm_faker(a);
+#endif
return Pico32x.regs[a / 2];
}
-static void p32x_reg_write16(u32 a, u32 d)
+static void p32x_reg_write8(u32 a, u32 d)
{
- a &= 0x3e;
+ u16 *r = Pico32x.regs;
+ a &= 0x3f;
- if (a == 0 && !(Pico32x.regs[0] & 1)) {
- Pico32x.regs[0] |= 1;
+ if (a == 1 && !(r[0] & 1)) {
+ r[0] |= 1;
Pico32xStartup();
return;
}
+
+ if (!(r[0] & 1))
+ return;
+
+ switch (a) {
+ case 0:
+ r[0] = (r[0] & 0x83) | ((d << 8) & P32XS_FM);
+ break;
+ case 5:
+ d &= 7;
+ if (r[4/2] != d) {
+ r[4/2] = d;
+ bank_switch(d);
+ }
+ break;
+ }
}
-static void p32x_reg_write8(u32 a, u32 d)
+static void p32x_reg_write16(u32 a, u32 d)
{
- a &= 0x3f;
+ u16 *r = Pico32x.regs;
+ a &= 0x3e;
- if (a == 1 && !(Pico32x.regs[0] & 1)) {
- Pico32x.regs[0] |= 1;
- Pico32xStartup();
+ switch (a) {
+ case 0:
+ r[0] = (r[0] & 0x83) | (d & P32XS_FM);
+ return;
+ }
+
+ if ((a & 0x30) == 0x20) {
+ r[a / 2] = d;
return;
}
+
+ p32x_reg_write8(a + 1, d);
}
// VDP regs
else
r[0x0a/2] &= ~P32XV_VBLK;
}
+ // priority inversion is handled in palette
+ if ((r[0] ^ d) & P32XV_PRI)
+ Pico32x.dirty_pal = 1;
r[0] = (r[0] & P32XV_nPAL) | (d & 0xff);
break;
case 0x0b:
p32x_vdp_write8(a | 1, d);
}
+// SH2 regs
+static u32 p32x_sh2reg_read16(u32 a)
+{
+ a &= 0xff; // ?
+ if (a == 0) {
+ return (Pico32x.regs[0] & P32XS_FM) | P32XS2_ADEN;
+ }
+
+ return 0;
+}
+
+static void p32x_sh2reg_write8(u32 a, u32 d)
+{
+}
+
+static void p32x_sh2reg_write16(u32 a, u32 d)
+{
+ a &= 0xff;
+
+ if ((a & 0x30) == 0x20) {
+ Pico32x.regs[a/2] = d;
+ return;
+ }
+
+ p32x_sh2reg_write8(a | 1, d);
+}
+
// default 32x handlers
u32 PicoRead8_32x(u32 a)
{
cpu68k_map_set(m68k_write16_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0);
}
+static void bank_switch(int b)
+{
+ unsigned int rs, bank;
+
+ bank = b << 20;
+ if (bank >= Pico.romsize) {
+ elprintf(EL_32X|EL_ANOMALY, "missing bank @ %06x", bank);
+ return;
+ }
+
+ // 32X ROM (unbanked, XXX: consider mirroring?)
+ rs = (Pico.romsize + M68K_BANK_MASK) & ~M68K_BANK_MASK;
+ rs -= bank;
+ if (rs > 0x100000)
+ rs = 0x100000;
+ cpu68k_map_set(m68k_read8_map, 0x900000, 0x900000 + rs - 1, Pico.rom + bank, 0);
+ cpu68k_map_set(m68k_read16_map, 0x900000, 0x900000 + rs - 1, Pico.rom + bank, 0);
+
+ elprintf(EL_32X, "bank %06x-%06x -> %06x", 0x900000, 0x900000 + rs - 1, bank);
+}
+
+// -----------------------------------------------------------------
+// SH2
+// -----------------------------------------------------------------
+
+u32 pico32x_read8(u32 a)
+{
+ u32 d = 0;
+ if (a < sizeof(Pico32xMem->sh2_rom_m))
+ return Pico32xMem->sh2_rom_m[a ^ 1];
+
+ if ((a & 0x0ffc0000) == 0x06000000)
+ return Pico32xMem->sdram[(a & 0x3ffff) ^ 1];
+
+ if ((a & 0x0fc00000) == 0x02000000)
+ if ((a & 0x003fffff) < Pico.romsize)
+ return Pico.rom[(a & 0x3fffff) ^ 1];
+
+ if ((a & 0x0fffff00) == 0x4000) {
+ d = p32x_sh2reg_read16(a);
+ goto out_16to8;
+ }
+
+ if ((a & 0x0fffff00) == 0x4100) {
+ d = p32x_vdp_read16(a);
+ goto out_16to8;
+ }
+
+ if ((a & 0x0fffff00) == 0x4200) {
+ d = Pico32xMem->pal[(a & 0x1ff) / 2];
+ goto out_16to8;
+ }
+
+ elprintf(EL_UIO, "sh2 unmapped r8 [%08x] %02x @%06x", a, d, ash2_pc());
+ return d;
+
+out_16to8:
+ if (a & 1)
+ d &= 0xff;
+ else
+ d >>= 8;
+
+ elprintf(EL_32X, "sh2 r8 [%08x] %02x @%06x", a, d, ash2_pc());
+ return d;
+}
+
+u32 pico32x_read16(u32 a)
+{
+ u32 d = 0;
+ if (a < sizeof(Pico32xMem->sh2_rom_m))
+ return *(u16 *)(Pico32xMem->sh2_rom_m + a);
+
+ if ((a & 0x0ffc0000) == 0x06000000)
+ return ((u16 *)Pico32xMem->sdram)[(a & 0x3ffff) / 2];
+
+ if ((a & 0x0fc00000) == 0x02000000)
+ if ((a & 0x003fffff) < Pico.romsize)
+ return ((u16 *)Pico.rom)[(a & 0x3fffff) / 2];
+
+ if ((a & 0x0fffff00) == 0x4000) {
+ d = p32x_sh2reg_read16(a);
+ goto out;
+ }
+
+ if ((a & 0x0fffff00) == 0x4100) {
+ d = p32x_vdp_read16(a);
+ goto out;
+ }
+
+ if ((a & 0x0fffff00) == 0x4200) {
+ d = Pico32xMem->pal[(a & 0x1ff) / 2];
+ goto out;
+ }
+
+ elprintf(EL_UIO, "sh2 unmapped r16 [%08x] %04x @%06x", a, d, ash2_pc());
+ return d;
+
+out:
+ elprintf(EL_32X, "sh2 r16 [%08x] %04x @%06x", a, d, ash2_pc());
+ return d;
+}
+
+u32 pico32x_read32(u32 a)
+{
+// elprintf(EL_UIO, "sh2 r32 [%08x] %08x @%06x", a, d, ash2_pc());
+ return (pico32x_read16(a) << 16) | pico32x_read16(a + 2);
+}
+
+void pico32x_write8(u32 a, u32 d)
+{
+ if ((a & 0x0ffffc00) == 0x4000)
+ elprintf(EL_32X, "sh2 w8 [%08x] %02x @%06x", a, d & 0xff, ash2_pc());
+
+ if ((a & 0x0ffc0000) == 0x06000000) {
+ Pico32xMem->sdram[(a & 0x3ffff) ^ 1] = d;
+ return;
+ }
+
+ if ((a & 0x0fffff00) == 0x4100) {
+ p32x_vdp_write8(a, d);
+ return;
+ }
+
+ if ((a & 0x0fffff00) == 0x4000) {
+ p32x_sh2reg_write8(a, d);
+ return;
+ }
+
+ elprintf(EL_UIO, "sh2 unmapped w8 [%08x] %02x @%06x", a, d & 0xff, ash2_pc());
+}
+
+void pico32x_write16(u32 a, u32 d)
+{
+ if ((a & 0x0ffffc00) == 0x4000)
+ elprintf(EL_32X, "sh2 w16 [%08x] %04x @%06x", a, d & 0xffff, ash2_pc());
+
+ if ((a & 0x0ffc0000) == 0x06000000) {
+ ((u16 *)Pico32xMem->sdram)[(a & 0x3ffff) / 2] = d;
+ return;
+ }
+
+ if ((a & 0x0fffff00) == 0x4100) {
+ p32x_vdp_write16(a, d);
+ return;
+ }
+
+ if ((a & 0x0ffffe00) == 0x4200) {
+ Pico32xMem->pal[(a & 0x1ff) / 2] = d;
+ Pico32x.dirty_pal = 1;
+ return;
+ }
+
+ if ((a & 0x0fffff00) == 0x4000) {
+ p32x_sh2reg_write16(a, d);
+ return;
+ }
+
+ elprintf(EL_UIO, "sh2 unmapped w16 [%08x] %04x @%06x", a, d & 0xffff, ash2_pc());
+}
+
+void pico32x_write32(u32 a, u32 d)
+{
+// elprintf(EL_UIO, "sh2 w32 [%08x] %08x @%06x", a, d, ash2_pc());
+ pico32x_write16(a, d >> 16);
+ pico32x_write16(a + 2, d);
+}
+
#define HWSWAP(x) (((x) << 16) | ((x) >> 16))
void PicoMemSetup32x(void)
{
unsigned short *ps;
unsigned int *pl;
- unsigned int rs, rs1;
+ unsigned int rs;
int i;
Pico32xMem = calloc(1, sizeof(*Pico32xMem));
for (i = 0xc0/2; i < 0x100/2; i++)
ps[i] = 0x4e71;
+#if 0
ps[0xc0/2] = 0x46fc;
ps[0xc2/2] = 0x2700; // move #0x2700,sr
ps[0xfe/2] = 0x60fe; // jump to self
+#else
+ ps[0xfe/2] = 0x4e75; // rts
+#endif
// fill remaining mem with ROM
memcpy(Pico32xMem->m68k_rom + 0x100, Pico.rom + 0x100, sizeof(Pico32xMem->m68k_rom) - 0x100);
+ // 32X ROM
+ // TODO: move
+ {
+ FILE *f = fopen("32X_M_BIOS.BIN", "rb");
+ int i;
+ if (f == NULL) {
+ printf("missing BIOS\n");
+ exit(1);
+ }
+ fread(Pico32xMem->sh2_rom_m, 1, sizeof(Pico32xMem->sh2_rom_m), f);
+ fclose(f);
+ for (i = 0; i < sizeof(Pico32xMem->sh2_rom_m); i += 2) {
+ int t = Pico32xMem->sh2_rom_m[i];
+ Pico32xMem->sh2_rom_m[i] = Pico32xMem->sh2_rom_m[i + 1];
+ Pico32xMem->sh2_rom_m[i + 1] = t;
+ }
+ }
+
// cartridge area becomes unmapped
// XXX: we take the easy way and don't unmap ROM,
// so that we can avoid handling the RV bit.
Pico32xSwapDRAM(1);
// 32X ROM (unbanked, XXX: consider mirroring?)
- rs1 = rs = (Pico.romsize + M68K_BANK_MASK) & ~M68K_BANK_MASK;
- if (rs1 > 0x80000)
- rs1 = 0x80000;
- cpu68k_map_set(m68k_read8_map, 0x880000, 0x880000 + rs1 - 1, Pico.rom, 0);
- cpu68k_map_set(m68k_read16_map, 0x880000, 0x880000 + rs1 - 1, Pico.rom, 0);
+ rs = (Pico.romsize + M68K_BANK_MASK) & ~M68K_BANK_MASK;
+ if (rs > 0x80000)
+ rs = 0x80000;
+ cpu68k_map_set(m68k_read8_map, 0x880000, 0x880000 + rs - 1, Pico.rom, 0);
+ cpu68k_map_set(m68k_read16_map, 0x880000, 0x880000 + rs - 1, Pico.rom, 0);
// 32X ROM (banked)
- if (rs > 0x100000)
- rs = 0x100000;
- cpu68k_map_set(m68k_read8_map, 0x900000, 0x900000 + rs - 1, Pico.rom, 0);
- cpu68k_map_set(m68k_read16_map, 0x900000, 0x900000 + rs - 1, Pico.rom, 0);
+ bank_switch(0);
}
notaz.gp2x.de / picodrive.git / blobdiff