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32x: more wip

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@774 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2009-09-14 10:41:30 +00:00
parent 974fdb5bfd
commit 5e49c3a88d
9 changed files with 100 additions and 34 deletions
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87
pico/32x/memory.c
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@ -5,13 +5,21 @@ static const char str_mars[] = "MARS";
struct Pico32xMem *Pico32xMem;
static void bank_switch(int b);
// SH2 faking
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
};
int p32x_csum_faked;
static u32 p32x_reg_read16(u32 a)
{
@ -20,9 +28,9 @@ static u32 p32x_reg_read16(u32 a)
// SH2 faker
if ((a & 0x30) == 0x20)
{
static int f = 0, csum_faked = 0;
if (a == 0x28 && !csum_faked) {
csum_faked = 1;
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]))
@ -33,17 +41,6 @@ static u32 p32x_reg_read16(u32 a)
return Pico32x.regs[a / 2];
}
static void p32x_reg_write16(u32 a, u32 d)
{
a &= 0x3e;
if (a == 0 && !(Pico32x.regs[0] & 1)) {
Pico32x.regs[0] |= 1;
Pico32xStartup();
return;
}
}
static void p32x_reg_write8(u32 a, u32 d)
{
a &= 0x3f;
@ -53,6 +50,23 @@ static void p32x_reg_write8(u32 a, u32 d)
Pico32xStartup();
return;
}
if (!(Pico32x.regs[0] & 1))
return;
if (a == 5) {
d &= 7;
if (Pico32x.regs[4/2] != d) {
Pico32x.regs[4/2] = d;
bank_switch(d);
return;
}
}
}
static void p32x_reg_write16(u32 a, u32 d)
{
p32x_reg_write8(a + 1, d);
}
// VDP regs
@ -77,6 +91,9 @@ static void p32x_vdp_write8(u32 a, u32 d)
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:
@ -260,12 +277,33 @@ void Pico32xSwapDRAM(int b)
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);
}
#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));
@ -284,9 +322,13 @@ void PicoMemSetup32x(void)
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);
@ -307,16 +349,13 @@ void PicoMemSetup32x(void)
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);
}