32x: initial code (security code passes)

git-svn-id: file:///home/notaz/opt/svn/PicoDrive@772 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2009-09-11 11:29:19 +00:00
parent 000f53350c
commit be2c420828
8 changed files with 340 additions and 5 deletions

252
pico/32x/memory.c Normal file
View file

@ -0,0 +1,252 @@
#include "../pico_int.h"
#include "../memory.h"
static const char str_mars[] = "MARS";
struct Pico32xMem {
u8 sdram[0x40000];
u8 dram[0x40000]; // AKA fb
u8 m68k_rom[M68K_BANK_SIZE]; // 0x100
};
static struct Pico32xMem *Pico32xMem;
static u32 p32x_reg_read16(u32 a)
{
a &= 0x3e;
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;
if (a == 1 && !(Pico32x.regs[0] & 1)) {
Pico32x.regs[0] |= 1;
Pico32xStartup();
return;
}
}
// VDP regs
static u32 p32x_vdp_read16(u32 a)
{
a &= 0x0e;
return Pico32x.vdp_regs[a / 2];
}
static void p32x_vdp_write16(u32 a, u32 d)
{
a &= 0x0e;
switch (a) {
case 0x0a:
Pico32x.pending_fb = d & 1;
if (Pico.video.status & 8) {
Pico32x.vdp_regs[0x0a/2] &= ~1;
Pico32x.vdp_regs[0x0a/2] |= d & 1;
}
break;
}
}
static void p32x_vdp_write8(u32 a, u32 d)
{
a &= 0x0f;
switch (a) {
case 0x0b:
Pico32x.pending_fb = d & 1;
if (Pico.video.status & 8) {
Pico32x.vdp_regs[0x0a/2] &= ~1;
Pico32x.vdp_regs[0x0a/2] |= d & 1;
}
break;
}
}
// default 32x handlers
u32 PicoRead8_32x(u32 a)
{
u32 d = 0;
if ((a & 0xffc0) == 0x5100) { // a15100
d = p32x_reg_read16(a);
goto out_16to8;
}
if ((a & 0xfff0) == 0x5180 && (Pico32x.regs[0] & 1)) {
d = p32x_vdp_read16(a);
goto out_16to8;
}
if ((a & 0xfffc) == 0x30ec) { // a130ec
d = str_mars[a & 3];
goto out;
}
elprintf(EL_UIO, "m68k unmapped r8 [%06x] @%06x", a, SekPc);
return d;
out_16to8:
if (a & 1)
d &= 0xff;
else
d >>= 8;
out:
elprintf(EL_32X, "m68k 32x r8 [%06x] %02x @%06x", a, d, SekPc);
return d;
}
u32 PicoRead16_32x(u32 a)
{
u32 d = 0;
if ((a & 0xffc0) == 0x5100) { // a15100
d = p32x_reg_read16(a);
goto out;
}
if ((a & 0xfff0) == 0x5180 && (Pico32x.regs[0] & 1)) { // a15180
d = p32x_vdp_read16(a);
goto out;
}
if ((a & 0xfffc) == 0x30ec) { // a130ec
d = !(a & 2) ? ('M'<<8)|'A' : ('R'<<8)|'S';
goto out;
}
elprintf(EL_UIO, "m68k unmapped r16 [%06x] @%06x", a, SekPc);
return d;
out:
elprintf(EL_32X, "m68k 32x r16 [%06x] %04x @%06x", a, d, SekPc);
return d;
}
void PicoWrite8_32x(u32 a, u32 d)
{
if ((a & 0xfc00) == 0x5000)
elprintf(EL_32X, "m68k 32x w8 [%06x] %02x @%06x", a, d & 0xff, SekPc);
if ((a & 0xffc0) == 0x5100) { // a15100
p32x_reg_write8(a, d);
return;
}
if ((a & 0xfff0) == 0x5180 && (Pico32x.regs[0] & 1)) { // a15180
p32x_vdp_write8(a, d);
return;
}
elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc);
}
void PicoWrite16_32x(u32 a, u32 d)
{
if ((a & 0xfc00) == 0x5000)
elprintf(EL_UIO, "m68k 32x w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
if ((a & 0xffc0) == 0x5100) { // a15100
p32x_reg_write16(a, d);
return;
}
if ((a & 0xfff0) == 0x5180 && (Pico32x.regs[0] & 1)) { // a15180
p32x_vdp_write16(a, d);
return;
}
elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
}
// hint vector is writeable
static void PicoWrite8_hint(u32 a, u32 d)
{
if ((a & 0xfffc) == 0x0070) {
Pico32xMem->m68k_rom[a ^ 1] = d;
return;
}
elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc);
}
static void PicoWrite16_hint(u32 a, u32 d)
{
if ((a & 0xfffc) == 0x0070) {
((u16 *)Pico32xMem->m68k_rom)[a/2] = d;
return;
}
elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
}
#define HWSWAP(x) (((x) << 16) | ((x) >> 16))
void PicoMemSetup32x(void)
{
unsigned short *ps;
unsigned int *pl;
unsigned int rs, rs1;
int i;
Pico32xMem = calloc(1, sizeof(*Pico32xMem));
if (Pico32xMem == NULL) {
elprintf(EL_STATUS, "OOM");
return;
}
// generate 68k ROM
ps = (unsigned short *)Pico32xMem->m68k_rom;
pl = (unsigned int *)Pico32xMem->m68k_rom;
for (i = 1; i < 0xc0/4; i++)
pl[i] = HWSWAP(0x880200 + i * 6);
// fill with nops
for (i = 0xc0/2; i < 0x100/2; i++)
ps[i] = 0x4e71;
ps[0xc0/2] = 0x46fc;
ps[0xc2/2] = 0x2700; // move #0x2700,sr
ps[0xfe/2] = 0x60fe; // jump to self
// fill remaining mem with ROM
memcpy(Pico32xMem->m68k_rom + 0x100, Pico.rom + 0x100, M68K_BANK_SIZE - 0x100);
// cartridge area becomes unmapped
// XXX: we take the easy way and don't unmap ROM,
// so that we can avoid handling the RV bit.
// m68k_map_unmap(0x000000, 0x3fffff);
// MD ROM area
cpu68k_map_set(m68k_read8_map, 0x000000, M68K_BANK_SIZE - 1, Pico32xMem->m68k_rom, 0);
cpu68k_map_set(m68k_read16_map, 0x000000, M68K_BANK_SIZE - 1, Pico32xMem->m68k_rom, 0);
cpu68k_map_set(m68k_write8_map, 0x000000, M68K_BANK_SIZE - 1, PicoWrite8_hint, 1); // TODO verify
cpu68k_map_set(m68k_write16_map, 0x000000, M68K_BANK_SIZE - 1, PicoWrite16_hint, 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);
// 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);
}