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triforce.c: Make it actually run code (nw)

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This commit is contained in:
Ville Linde 2012-08-12 21:55:30 +00:00
parent cb808c974a
commit df3a1cc9f7
1 changed files with 97 additions and 3 deletions
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100
src/mame/drivers/triforce.c
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@ -414,10 +414,38 @@ public:
triforce_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
{ }
DECLARE_READ64_MEMBER(gc_pi_r);
DECLARE_WRITE64_MEMBER(gc_pi_w);
DECLARE_READ64_MEMBER(gc_exi_r);
DECLARE_WRITE64_MEMBER(gc_exi_w);
};
static ADDRESS_MAP_START( gc_map, AS_PROGRAM, 32, triforce_state )
AM_RANGE(0xffe00000, 0xffffffff) AM_ROM AM_REGION("maincpu", 0) AM_SHARE("share2") /* Program ROM */
READ64_MEMBER(triforce_state::gc_pi_r)
{
return 0;
}
WRITE64_MEMBER(triforce_state::gc_pi_w)
{
}
READ64_MEMBER(triforce_state::gc_exi_r)
{
return 0;
}
WRITE64_MEMBER(triforce_state::gc_exi_w)
{
}
static ADDRESS_MAP_START( gc_map, AS_PROGRAM, 64, triforce_state )
AM_RANGE(0x00000000, 0x017fffff) AM_RAM
AM_RANGE(0x0c003000, 0x0c003fff) AM_READWRITE(gc_pi_r, gc_pi_w)
AM_RANGE(0x0c006800, 0x0c0068ff) AM_READWRITE(gc_exi_r, gc_exi_w)
AM_RANGE(0xfff00000, 0xffffffff) AM_ROM AM_REGION("maincpu", 0) AM_SHARE("share2") /* Program ROM */
ADDRESS_MAP_END
@ -434,14 +462,79 @@ static SCREEN_UPDATE_RGB32(triforce)
static INPUT_PORTS_START( triforce )
INPUT_PORTS_END
// bootrom descrambler reversed by segher
// Copyright 2008 Segher Boessenkool <segher@kernel.crashing.org>
static void descrambler(UINT8* data, UINT32 size)
{
UINT8 acc = 0;
UINT8 nacc = 0;
UINT16 t = 0x2953;
UINT16 u = 0xd9c2;
UINT16 v = 0x3ff1;
UINT8 x = 1;
for (UINT32 it = 0; it < size;)
{
int t0 = t & 1;
int t1 = (t >> 1) & 1;
int u0 = u & 1;
int u1 = (u >> 1) & 1;
int v0 = v & 1;
x ^= t1 ^ v0;
x ^= (u0 | u1);
x ^= (t0 ^ u1 ^ v0) & (t0 ^ u0);
if (t0 == u0)
{
v >>= 1;
if (v0)
v ^= 0xb3d0;
}
if (t0 == 0)
{
u >>= 1;
if (u0)
u ^= 0xfb10;
}
t >>= 1;
if (t0)
t ^= 0xa740;
nacc++;
acc = 2*acc + x;
if (nacc == 8)
{
data[BYTE8_XOR_BE(it)] ^= acc;
it++;
nacc = 0;
}
}
}
static MACHINE_START( triforce )
{
/* set conservative DRC options */
ppcdrc_set_options(machine.device("maincpu"), PPCDRC_COMPATIBLE_OPTIONS);
UINT8 *rom = (UINT8*)machine.root_device().memregion("maincpu")->base();
descrambler(&rom[0x100], 0x1afe00);
}
static MACHINE_CONFIG_START( triforce_base, triforce_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", PPC403GA, 64000000) /* Correct CPU is a PowerPC 750 (what Apple called "G3") with paired-single vector instructions added */
MCFG_CPU_ADD("maincpu", PPC603, 64000000) /* Correct CPU is a PowerPC 750 (what Apple called "G3") with paired-single vector instructions added */
MCFG_CPU_PROGRAM_MAP(gc_map)
MCFG_QUANTUM_TIME(attotime::from_hz(6000))
MCFG_MACHINE_START(triforce)
/* video hardware */
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_REFRESH_RATE(60)
@ -458,6 +551,7 @@ static MACHINE_CONFIG_DERIVED( triforcegd, triforce_base )
MCFG_NAOMI_GDROM_BOARD_ADD("rom_board", ":gdrom", "picreturn", NULL, "maincpu", NULL)
MACHINE_CONFIG_END
#define ROM_LOAD16_WORD_SWAP_BIOS(bios,name,offset,length,hash) \
ROMX_LOAD(name, offset, length, hash, ROM_GROUPWORD | ROM_BIOS(bios+1)) /* Note '+1' */