Drop in the old olds protection simulation.

This commit is contained in:
iq_132 2015-04-30 01:28:20 +00:00
parent c567597580
commit 01c8f314c8
1 changed files with 365 additions and 5 deletions

View File

@ -455,6 +455,7 @@ static void IGS022_handle_command()
}
}
#if 0
static UINT32 olds_prot_addr(UINT16 addr)
{
switch (addr & 0xff)
@ -598,6 +599,7 @@ static void IGS028_handle()
break;
}
}
#endif
static void killbld_protection_calculate_hold(INT32 y, INT32 z)
{
@ -688,6 +690,7 @@ static void __fastcall killbld_igs025_prot_write(UINT32 address, UINT16 data)
}
}
#if 0
static void __fastcall olds_igs025_prot_write(UINT32 address, UINT16 data)
{
bprintf (0, _T("PRTW: %5.5x %4.4x\n"), address, data);
@ -731,6 +734,7 @@ static void __fastcall olds_igs025_prot_write(UINT32 address, UINT16 data)
break;
}
}
#endif
static void __fastcall drgw2_igs025_prot_write(UINT32 address, UINT16 data)
{
@ -823,6 +827,11 @@ static void common_reset()
static void drgw2_reset()
{
if (strcmp(BurnDrvGetTextA(DRV_NAME), "drgw2") == 0) kb_region = 6;
if (strcmp(BurnDrvGetTextA(DRV_NAME), "dw2v100x") == 0) kb_region = 6;
if (strcmp(BurnDrvGetTextA(DRV_NAME), "drgw2c") == 0) kb_region = 5;
if (strcmp(BurnDrvGetTextA(DRV_NAME), "drgw2j") == 0) kb_region = 1;
common_reset();
}
@ -879,15 +888,11 @@ static INT32 CommonScan(INT32 nAction, INT32 *)
return 0;
}
#if 0
static void olds_reset()
{
common_reset();
if (strcmp(BurnDrvGetTextA(DRV_NAME), "drgw2") == 0) kb_region = 6;
if (strcmp(BurnDrvGetTextA(DRV_NAME), "dw2v100x") == 0) kb_region = 6;
if (strcmp(BurnDrvGetTextA(DRV_NAME), "drgw2c") == 0) kb_region = 5;
if (strcmp(BurnDrvGetTextA(DRV_NAME), "drgw2j") == 0) kb_region = 1;
kb_game_id = 0x00900000 | kb_region;
sharedprotram[0x1000/2] = 0x4749; // 'IGS.28'
@ -896,6 +901,7 @@ static void olds_reset()
sharedprotram[0x3064/2] = 0xB315; // crc?
}
#endif
void install_protection_asic25_asic22_killbld()
{
@ -943,6 +949,7 @@ void install_protection_asic25_asic12_dw2()
SekClose();
}
#if 0
void install_protection_asic25_asic28_olds()
{
pPgmScanCallback = CommonScan;
@ -957,3 +964,356 @@ void install_protection_asic25_asic28_olds()
SekSetWriteWordHandler(4, olds_igs025_prot_write);
SekClose();
}
#endif
static INT32 m_olds_cmd;
static INT32 m_olds_reg;
static INT32 m_olds_ptr;
static UINT16 m_olds_bs;
static UINT16 m_olds_cmd3;
static UINT16 m_olds_prot_hold;
static UINT16 m_olds_prot_hilo;
static UINT16 m_olds_prot_hilo_select;
static UINT32 olds_prot_addr(UINT16 addr)
{
switch (addr & 0xff)
{
case 0x0:
case 0x5:
case 0xa: return 0x402a00 + ((addr >> 8) << 2);
case 0x2:
case 0x8: return 0x402e00 + ((addr >> 8) << 2);
case 0x1: return 0x40307e;
case 0x3: return 0x403090;
case 0x4: return 0x40309a;
case 0x6: return 0x4030a4;
case 0x7: return 0x403000;
case 0x9: return 0x40306e;
}
return 0;
}
static UINT32 olds_read_reg(UINT16 addr)
{
UINT32 protaddr = (olds_prot_addr(addr) - 0x400000) / 2;
return sharedprotram[protaddr] << 16 | sharedprotram[protaddr + 1];
}
static void olds_write_reg( UINT16 addr, UINT32 val )
{
sharedprotram[(olds_prot_addr(addr) - 0x400000) / 2] = val >> 16;
sharedprotram[(olds_prot_addr(addr) - 0x400000) / 2 + 1] = val & 0xffff;
}
static void IGS028_do_dma(UINT16 src, UINT16 dst, UINT16 size, UINT16 mode)
{
UINT16 param = mode >> 8;
UINT16 *PROTROM = (UINT16*)(PGMUSER0 + 0x10000);
mode &= 0x0f;
switch (mode)
{
case 0x00: // This mode copies code later on in the game! Encrypted somehow?
// src:2fc8, dst: 045a, size: 025e, mode: 0000
// jumps from 12beb4 in unprotected set
// jumps from 1313e0 in protected set
case 0x01: // swap bytes and nibbles
case 0x02: // ^= encryption
case 0x05: // copy
case 0x06: // += encryption (correct?)
{
UINT8 extraoffset = param & 0xff;
UINT8 *dectable = (UINT8 *)(PROTROM + (0x100 / 2));
for (INT32 x = 0; x < size; x++)
{
UINT16 dat2 = PROTROM[src + x];
int taboff = ((x*2)+extraoffset) & 0xff; // must allow for overflow in instances of odd offsets
unsigned short extraxor = ((dectable[taboff + 0]) << 0) | (dectable[taboff + 1] << 8);
if (mode==0) dat2 = 0x4e75; // hack
if (mode==1) dat2 = ((dat2 & 0xf000) >> 12) | ((dat2 & 0x0f00) >> 4) | ((dat2 & 0x00f0) << 4) | ((dat2 & 0x000f) << 12);
if (mode==2) dat2 ^= extraxor;
//if (mode==5) dat2 = dat2;
if (mode==6) dat2 += extraxor;
if (mode==2 || mode==6) dat2 = (dat2<<8)|(dat2>>8);
sharedprotram[dst + x] = (dat2 << 8) | (dat2 >> 8);
}
}
}
}
static void olds_protection_calculate_hold(int y, int z) // calculated in routine $12dbc2 in olds
{
unsigned short old = m_olds_prot_hold;
m_olds_prot_hold = ((old << 1) | (old >> 15));
m_olds_prot_hold ^= 0x2bad;
m_olds_prot_hold ^= BIT(z, y);
m_olds_prot_hold ^= BIT( old, 7) << 0;
m_olds_prot_hold ^= BIT(~old, 13) << 4;
m_olds_prot_hold ^= BIT( old, 3) << 11;
m_olds_prot_hold ^= (m_olds_prot_hilo & ~0x0408) << 1; // $81790c
}
static void olds_protection_calculate_hilo() // calculated in routine $12dbc2 in olds
{
UINT8 source;
m_olds_prot_hilo_select++;
if (m_olds_prot_hilo_select > 0xeb) {
m_olds_prot_hilo_select = 0;
}
source = source_data[PgmInput[7] - 1][m_olds_prot_hilo_select];
if (m_olds_prot_hilo_select & 1) // $8178fa
{
m_olds_prot_hilo = (m_olds_prot_hilo & 0x00ff) | (source << 8); // $8178d8
}
else
{
m_olds_prot_hilo = (m_olds_prot_hilo & 0xff00) | (source << 0); // $8178d8
}
}
static void __fastcall olds_protection_w(UINT32 offset, UINT16 data)
{
offset &= 2;
if (offset == 0)
{
m_olds_cmd = data;
}
else
{
switch (m_olds_cmd)
{
case 0x00:
m_olds_reg = data;
break;
case 0x02:
m_olds_bs = ((data & 0x03) << 6) | ((data & 0x04) << 3) | ((data & 0x08) << 1);
break;
case 0x03:
{
UINT16 cmd = sharedprotram[0x3026 / 2];
switch (cmd)
{
case 0x12:
{
UINT16 mode = sharedprotram[0x303e / 2]; // ?
UINT16 src = sharedprotram[0x306a / 2] >> 1; // ?
UINT16 dst = sharedprotram[0x3084 / 2] & 0x1fff;
UINT16 size = sharedprotram[0x30a2 / 2] & 0x1fff;
IGS028_do_dma(src, dst, size, mode);
}
break;
case 0x64: // incomplete...
{
UINT16 p1 = sharedprotram[0x3050 / 2];
UINT16 p2 = sharedprotram[0x3082 / 2];
UINT16 p3 = sharedprotram[0x3054 / 2];
UINT16 p4 = sharedprotram[0x3088 / 2];
if (p2 == 0x02)
olds_write_reg(p1, olds_read_reg(p1) + 0x10000);
switch (p4)
{
case 0xd:
olds_write_reg(p1,olds_read_reg(p3));
break;
case 0x0:
olds_write_reg(p3,(olds_read_reg(p2))^(olds_read_reg(p1)));
break;
case 0xe:
olds_write_reg(p3,olds_read_reg(p3)+0x10000);
break;
case 0x2:
olds_write_reg(p1,(olds_read_reg(p2))+(olds_read_reg(p3)));
break;
case 0x6:
olds_write_reg(p3,(olds_read_reg(p2))&(olds_read_reg(p1)));
break;
case 0x1:
olds_write_reg(p2,olds_read_reg(p1)+0x10000);
break;
case 0x7:
olds_write_reg(p3,olds_read_reg(p1));
break;
default:
break;
}
}
}
m_olds_cmd3 = ((data >> 4) + 1) & 0x3;
}
break;
case 0x04:
m_olds_ptr = data;
break;
case 0x20:
case 0x21:
case 0x22:
case 0x23:
case 0x24:
case 0x25:
case 0x26:
case 0x27:
m_olds_ptr++;
olds_protection_calculate_hold(m_olds_cmd & 0x0f, data & 0xff);
break;
}
}
}
static UINT16 __fastcall olds_protection_r(UINT32 offset)
{
offset &= 2;
if (offset)
{
switch (m_olds_cmd)
{
case 0x01:
return m_olds_reg & 0x7f;
case 0x02:
return m_olds_bs | 0x80;
case 0x03:
return m_olds_cmd3;
case 0x05:
{
switch (m_olds_ptr)
{
case 1: return 0x3f00 | PgmInput[7];
case 2:
return 0x3f00 | 0x00;
case 3:
return 0x3f00 | 0x90;
case 4:
return 0x3f00 | 0x00;
case 5:
default: // >= 5
return 0x3f00 | BITSWAP08(m_olds_prot_hold, 5,2,9,7,10,13,12,15); // $817906
}
}
case 0x40:
olds_protection_calculate_hilo();
return 0; // unused?
}
}
return 0;
}
static void reset_olds()
{
// written by protection device
// there seems to be an auto-dma that writes from $401000-402573?
sharedprotram[0x1000/2] = 0x4749; // 'IGS.28'
sharedprotram[0x1002/2] = 0x2E53;
sharedprotram[0x1004/2] = 0x3832;
sharedprotram[0x3064/2] = 0xB315; // crc or status check?
// Should these be written by command 64??
// sharedprotram[0x2a00/2] = 0x0000; // ?
// sharedprotram[0x2a02/2] = 0x0000; // ?
sharedprotram[0x2a04/2] = 0x0002; // ?
// sharedprotram[0x2a06/2] = 0x0000; // ?
// sharedprotram[0x2ac0/2] = 0x0000; // ?
sharedprotram[0x2ac2/2] = 0x0001; // ?
// sharedprotram[0x2e00/2] = 0x0000; // ?
// sharedprotram[0x2e02/2] = 0x0000; // ?
// sharedprotram[0x2e04/2] = 0x0000; // ?
sharedprotram[0x2e06/2] = 0x0009; // seconds on char. select timer
// sharedprotram[0x2e08/2] = 0x0000; // ?
sharedprotram[0x2e0a/2] = 0x0006; // ?
m_olds_prot_hold = 0;
m_olds_prot_hilo = 0;
m_olds_prot_hilo_select = 0;
m_olds_cmd = 0;
m_olds_reg = 0;
m_olds_ptr = 0;
m_olds_bs = 0;
m_olds_cmd3 = 0;
}
static INT32 oldsScan(INT32 nAction, INT32 *)
{
struct BurnArea ba;
if (nAction & ACB_MEMORY_RAM) {
ba.Data = PGMUSER0 + 0x000000;
ba.nLen = 0x0004000;
ba.nAddress = 0x400000;
ba.szName = "ProtRAM";
BurnAcb(&ba);
}
if (nAction & ACB_DRIVER_DATA) {
SCAN_VAR(m_olds_prot_hold);
SCAN_VAR(m_olds_prot_hilo);
SCAN_VAR(m_olds_prot_hilo_select);
SCAN_VAR(m_olds_cmd);
SCAN_VAR(m_olds_reg);
SCAN_VAR(m_olds_ptr);
SCAN_VAR(m_olds_bs);
SCAN_VAR(m_olds_cmd3);
}
return 0;
}
void install_protection_asic25_asic28_olds()
{
pPgmScanCallback = oldsScan;
pPgmResetCallback = reset_olds;
sharedprotram = (UINT16*)PGMUSER0;
// no protection rom and different offset for olds100a
if (strcmp(BurnDrvGetTextA(DRV_NAME), "olds100a") == 0) {
BurnLoadRom(PGMUSER0 + 0x10000, 15, 1);
} else {
BurnLoadRom(PGMUSER0 + 0x10000, 19, 1);
}
SekOpen(0);
SekMapMemory(PGMUSER0, 0x400000, 0x403fff, MAP_RAM);
SekMapHandler(4, 0xdcb400, 0xdcb403, MAP_READ | MAP_WRITE);
SekSetReadWordHandler(4, olds_protection_r);
SekSetWriteWordHandler(4, olds_protection_w);
SekClose();
}