mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
974fdb5bfd
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@773 be3aeb3a-fb24-0410-a615-afba39da0efa
322 lines
7.1 KiB
C
322 lines
7.1 KiB
C
#include "../pico_int.h"
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#include "../memory.h"
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static const char str_mars[] = "MARS";
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struct Pico32xMem *Pico32xMem;
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// SH2 faking
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static const u16 comm_fakevals[] = {
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0x4d5f, 0x4f4b, // M_OK
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0x535f, 0x4f4b, // S_OK
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0x0002, // Mortal Kombat
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0, // pad
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};
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static u32 p32x_reg_read16(u32 a)
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{
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a &= 0x3e;
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// SH2 faker
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if ((a & 0x30) == 0x20)
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{
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static int f = 0, csum_faked = 0;
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if (a == 0x28 && !csum_faked) {
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csum_faked = 1;
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return *(unsigned short *)(Pico.rom + 0x18e);
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}
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if (f >= sizeof(comm_fakevals) / sizeof(comm_fakevals[0]))
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f = 0;
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return comm_fakevals[f++];
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}
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return Pico32x.regs[a / 2];
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}
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static void p32x_reg_write16(u32 a, u32 d)
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{
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a &= 0x3e;
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if (a == 0 && !(Pico32x.regs[0] & 1)) {
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Pico32x.regs[0] |= 1;
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Pico32xStartup();
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return;
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}
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}
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static void p32x_reg_write8(u32 a, u32 d)
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{
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a &= 0x3f;
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if (a == 1 && !(Pico32x.regs[0] & 1)) {
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Pico32x.regs[0] |= 1;
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Pico32xStartup();
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return;
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}
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}
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// VDP regs
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static u32 p32x_vdp_read16(u32 a)
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{
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a &= 0x0e;
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return Pico32x.vdp_regs[a / 2];
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}
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static void p32x_vdp_write8(u32 a, u32 d)
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{
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u16 *r = Pico32x.vdp_regs;
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a &= 0x0f;
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// TODO: verify what's writeable
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switch (a) {
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case 0x01:
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if (((r[0] & 3) == 0) != ((d & 3) == 0)) { // forced blanking changed
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if (Pico.video.status & 8)
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r[0x0a/2] |= P32XV_VBLK;
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else
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r[0x0a/2] &= ~P32XV_VBLK;
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}
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r[0] = (r[0] & P32XV_nPAL) | (d & 0xff);
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break;
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case 0x0b:
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d &= 1;
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Pico32x.pending_fb = d;
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// if we are blanking and FS bit is changing
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if ((r[0x0a/2] & P32XV_VBLK) && ((r[0x0a/2] ^ d) & P32XV_FS)) {
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r[0x0a/2] ^= 1;
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Pico32xSwapDRAM(d ^ 1);
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}
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break;
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}
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}
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static void p32x_vdp_write16(u32 a, u32 d)
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{
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p32x_vdp_write8(a | 1, d);
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}
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// default 32x handlers
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u32 PicoRead8_32x(u32 a)
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{
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u32 d = 0;
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if ((a & 0xffc0) == 0x5100) { // a15100
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d = p32x_reg_read16(a);
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goto out_16to8;
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}
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if (!(Pico32x.regs[0] & 1))
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goto no_vdp;
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if ((a & 0xfff0) == 0x5180) { // a15180
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d = p32x_vdp_read16(a);
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goto out_16to8;
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}
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if ((a & 0xfe00) == 0x5200) { // a15200
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d = Pico32xMem->pal[(a & 0x1ff) / 2];
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goto out_16to8;
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}
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no_vdp:
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if ((a & 0xfffc) == 0x30ec) { // a130ec
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d = str_mars[a & 3];
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goto out;
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}
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elprintf(EL_UIO, "m68k unmapped r8 [%06x] @%06x", a, SekPc);
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return d;
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out_16to8:
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if (a & 1)
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d &= 0xff;
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else
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d >>= 8;
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out:
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elprintf(EL_32X, "m68k 32x r8 [%06x] %02x @%06x", a, d, SekPc);
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return d;
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}
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u32 PicoRead16_32x(u32 a)
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{
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u32 d = 0;
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if ((a & 0xffc0) == 0x5100) { // a15100
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d = p32x_reg_read16(a);
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goto out;
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}
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if (!(Pico32x.regs[0] & 1))
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goto no_vdp;
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if ((a & 0xfff0) == 0x5180) { // a15180
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d = p32x_vdp_read16(a);
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goto out;
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}
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if ((a & 0xfe00) == 0x5200) { // a15200
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d = Pico32xMem->pal[(a & 0x1ff) / 2];
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goto out;
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}
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no_vdp:
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if ((a & 0xfffc) == 0x30ec) { // a130ec
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d = !(a & 2) ? ('M'<<8)|'A' : ('R'<<8)|'S';
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goto out;
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}
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elprintf(EL_UIO, "m68k unmapped r16 [%06x] @%06x", a, SekPc);
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return d;
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out:
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elprintf(EL_32X, "m68k 32x r16 [%06x] %04x @%06x", a, d, SekPc);
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return d;
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}
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void PicoWrite8_32x(u32 a, u32 d)
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{
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if ((a & 0xfc00) == 0x5000)
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elprintf(EL_32X, "m68k 32x w8 [%06x] %02x @%06x", a, d & 0xff, SekPc);
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if ((a & 0xffc0) == 0x5100) { // a15100
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p32x_reg_write8(a, d);
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return;
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}
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if (!(Pico32x.regs[0] & 1))
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goto no_vdp;
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if ((a & 0xfff0) == 0x5180) { // a15180
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p32x_vdp_write8(a, d);
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return;
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}
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// TODO: verify
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if ((a & 0xfe00) == 0x5200) { // a15200
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elprintf(EL_32X|EL_ANOMALY, "m68k 32x PAL w8 [%06x] %02x @%06x", a, d & 0xff, SekPc);
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((u8 *)Pico32xMem->pal)[(a & 0x1ff) ^ 1] = d;
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Pico32x.dirty_pal = 1;
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return;
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}
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no_vdp:
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elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc);
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}
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void PicoWrite16_32x(u32 a, u32 d)
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{
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if ((a & 0xfc00) == 0x5000)
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elprintf(EL_UIO, "m68k 32x w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
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if ((a & 0xffc0) == 0x5100) { // a15100
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p32x_reg_write16(a, d);
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return;
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}
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if (!(Pico32x.regs[0] & 1))
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goto no_vdp;
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if ((a & 0xfff0) == 0x5180) { // a15180
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p32x_vdp_write16(a, d);
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return;
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}
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if ((a & 0xfe00) == 0x5200) { // a15200
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Pico32xMem->pal[(a & 0x1ff) / 2] = d;
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Pico32x.dirty_pal = 1;
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return;
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}
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no_vdp:
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elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
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}
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// hint vector is writeable
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static void PicoWrite8_hint(u32 a, u32 d)
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{
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if ((a & 0xfffc) == 0x0070) {
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Pico32xMem->m68k_rom[a ^ 1] = d;
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return;
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}
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elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc);
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}
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static void PicoWrite16_hint(u32 a, u32 d)
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{
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if ((a & 0xfffc) == 0x0070) {
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((u16 *)Pico32xMem->m68k_rom)[a/2] = d;
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return;
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}
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elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
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}
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void Pico32xSwapDRAM(int b)
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{
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cpu68k_map_set(m68k_read8_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0);
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cpu68k_map_set(m68k_read16_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0);
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cpu68k_map_set(m68k_write8_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0);
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cpu68k_map_set(m68k_write16_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0);
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}
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#define HWSWAP(x) (((x) << 16) | ((x) >> 16))
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void PicoMemSetup32x(void)
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{
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unsigned short *ps;
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unsigned int *pl;
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unsigned int rs, rs1;
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int i;
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Pico32xMem = calloc(1, sizeof(*Pico32xMem));
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if (Pico32xMem == NULL) {
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elprintf(EL_STATUS, "OOM");
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return;
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}
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// generate 68k ROM
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ps = (unsigned short *)Pico32xMem->m68k_rom;
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pl = (unsigned int *)Pico32xMem->m68k_rom;
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for (i = 1; i < 0xc0/4; i++)
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pl[i] = HWSWAP(0x880200 + (i - 1) * 6);
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// fill with nops
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for (i = 0xc0/2; i < 0x100/2; i++)
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ps[i] = 0x4e71;
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ps[0xc0/2] = 0x46fc;
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ps[0xc2/2] = 0x2700; // move #0x2700,sr
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ps[0xfe/2] = 0x60fe; // jump to self
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// fill remaining mem with ROM
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memcpy(Pico32xMem->m68k_rom + 0x100, Pico.rom + 0x100, sizeof(Pico32xMem->m68k_rom) - 0x100);
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// cartridge area becomes unmapped
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// XXX: we take the easy way and don't unmap ROM,
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// so that we can avoid handling the RV bit.
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// m68k_map_unmap(0x000000, 0x3fffff);
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// MD ROM area
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rs = sizeof(Pico32xMem->m68k_rom);
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cpu68k_map_set(m68k_read8_map, 0x000000, rs - 1, Pico32xMem->m68k_rom, 0);
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cpu68k_map_set(m68k_read16_map, 0x000000, rs - 1, Pico32xMem->m68k_rom, 0);
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cpu68k_map_set(m68k_write8_map, 0x000000, rs - 1, PicoWrite8_hint, 1); // TODO verify
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cpu68k_map_set(m68k_write16_map, 0x000000, rs - 1, PicoWrite16_hint, 1);
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// DRAM area
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Pico32xSwapDRAM(1);
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// 32X ROM (unbanked, XXX: consider mirroring?)
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rs1 = rs = (Pico.romsize + M68K_BANK_MASK) & ~M68K_BANK_MASK;
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if (rs1 > 0x80000)
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rs1 = 0x80000;
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cpu68k_map_set(m68k_read8_map, 0x880000, 0x880000 + rs1 - 1, Pico.rom, 0);
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cpu68k_map_set(m68k_read16_map, 0x880000, 0x880000 + rs1 - 1, Pico.rom, 0);
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// 32X ROM (banked)
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if (rs > 0x100000)
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rs = 0x100000;
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cpu68k_map_set(m68k_read8_map, 0x900000, 0x900000 + rs - 1, Pico.rom, 0);
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cpu68k_map_set(m68k_read16_map, 0x900000, 0x900000 + rs - 1, Pico.rom, 0);
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}
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