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Basic implementation of the memory map master cycle steals in the SNES driver [Angelo Salese]

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Angelo Salese 2010-04-07 01:18:35 +00:00
parent 340ad68dfc
commit 4e18ddef23
1 changed files with 77 additions and 0 deletions
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77
src/mame/machine/snes.c
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@ -809,6 +809,62 @@ address | | | | | | |
*/
/*FIXME: missing work RAM access steal */
static int snes_bank_0x00_0x3f_cycles(running_machine *machine,UINT32 offset)
{
/*
$00-$3F | $0000-$1FFF | Slow | Address Bus A + /WRAM (mirror $7E:0000-$1FFF)
| $2000-$20FF | Fast | Address Bus A
| $2100-$21FF | Fast | Address Bus B
| $2200-$3FFF | Fast | Address Bus A
| $4000-$41FF | XSlow | Internal CPU registers (see Note 1 below)
| $4200-$43FF | Fast | Internal CPU registers (see Note 1 below)
| $4400-$5FFF | Fast | Address Bus A
| $6000-$7FFF | Slow | Address Bus A
| $8000-$FFFF | Slow | Address Bus A + /CART
*/
if(((offset & 0xff00) == 0x4000) || ((offset & 0xff00) == 0x4100))
return 12;
if(((offset & 0xff00) >= 0x0000) && ((offset & 0xff00) <= 0x1f00))
return 8;
if((offset & 0xff00) >= 0x6000)
return 8;
return 6;
}
static int snes_bank_0x80_0xbf_cycles(running_machine *machine,UINT32 offset)
{
/*
$80-$BF | $0000-$1FFF | Slow | Address Bus A + /WRAM (mirror $7E:0000-$1FFF)
| $2000-$20FF | Fast | Address Bus A
| $2100-$21FF | Fast | Address Bus B
| $2200-$3FFF | Fast | Address Bus A
| $4000-$41FF | XSlow | Internal CPU registers (see Note 1 below)
| $4200-$43FF | Fast | Internal CPU registers (see Note 1 below)
| $4400-$5FFF | Fast | Address Bus A
| $6000-$7FFF | Slow | Address Bus A
| $8000-$FFFF | Note2 | Address Bus A + /CART
*/
if(((offset & 0xff00) == 0x4000) || ((offset & 0xff00) == 0x4100))
return 12;
if(((offset & 0xff00) >= 0x0000) && ((offset & 0xff00) <= 0x1f00))
return 8;
if(((offset & 0xff00) >= 0x6000) && ((offset & 0xff00) <= 0x7f00))
return 8;
if(((offset & 0xff00) >= 0x8000) && ((offset & 0xff00) <= 0xff00))
return (snes_ram[MEMSEL] & 1) ? 6 : 8;
return 6;
}
/* 0x000000 - 0x2fffff */
READ8_HANDLER( snes_r_bank1 )
{
@ -855,6 +911,7 @@ READ8_HANDLER( snes_r_bank1 )
else
value = snes_ram[offset];
cpu_adjust_icount(space->cpu, -snes_bank_0x00_0x3f_cycles(space->machine, offset));
return value;
}
@ -911,6 +968,8 @@ READ8_HANDLER( snes_r_bank2 )
else
value = snes_ram[0x300000 + offset];
cpu_adjust_icount(space->cpu, -snes_bank_0x00_0x3f_cycles(space->machine, offset));
return value;
}
@ -949,6 +1008,7 @@ READ8_HANDLER( snes_r_bank3 )
else /* Mode 21 & 25 + SuperFX games */
value = snes_ram[0x400000 + offset];
cpu_adjust_icount(space->cpu, -8);
return value;
}
@ -984,6 +1044,7 @@ READ8_HANDLER( snes_r_bank4 )
else if (snes_cart.mode & 0x0a) /* Mode 21 & 25 */
value = snes_ram[0x600000 + offset];
cpu_adjust_icount(space->cpu, -8);
return value;
}
@ -1017,6 +1078,7 @@ READ8_HANDLER( snes_r_bank5 )
else
value = snes_ram[0x700000 + offset];
cpu_adjust_icount(space->cpu, -8);
return value;
}
@ -1062,6 +1124,7 @@ READ8_HANDLER( snes_r_bank6 )
else
value = snes_ram[0x800000 + offset];
cpu_adjust_icount(space->cpu, -snes_bank_0x80_0xbf_cycles(space->machine, offset));
return value;
}
@ -1112,6 +1175,8 @@ READ8_HANDLER( snes_r_bank7 )
else /* Mode 21 & 25 + SuperFX Games */
value = snes_ram[0xc00000 + offset];
cpu_adjust_icount(space->cpu, -(snes_ram[MEMSEL] & 1) ? 6 : 8);
return value;
}
@ -1156,6 +1221,8 @@ WRITE8_HANDLER( snes_w_bank1 )
dsp3_write(address, data);
else
logerror( "(PC=%06x) Attempt to write to ROM address: %X\n",cpu_get_pc(space->cpu),offset );
cpu_adjust_icount(space->cpu, -snes_bank_0x00_0x3f_cycles(space->machine, offset));
}
/* 0x300000 - 0x3fffff */
@ -1205,6 +1272,8 @@ WRITE8_HANDLER( snes_w_bank2 )
dsp4_write(data);
else
logerror("(PC=%06x) Attempt to write to ROM address: %X\n",cpu_get_pc(space->cpu),offset + 0x300000);
cpu_adjust_icount(space->cpu, -snes_bank_0x00_0x3f_cycles(space->machine, offset));
}
/* 0x600000 - 0x6fffff */
@ -1227,6 +1296,8 @@ WRITE8_HANDLER( snes_w_bank4 )
}
else if (snes_cart.mode & 0x0a)
logerror("(PC=%06x) Attempt to write to ROM address: %X\n",cpu_get_pc(space->cpu),offset + 0x600000);
cpu_adjust_icount(space->cpu, -8);
}
/* 0x700000 - 0x7dffff */
@ -1248,6 +1319,8 @@ WRITE8_HANDLER( snes_w_bank5 )
}
else if (snes_cart.mode & 0x0a)
logerror("(PC=%06x) Attempt to write to ROM address: %X\n",cpu_get_pc(space->cpu),offset + 0x700000);
cpu_adjust_icount(space->cpu, -8);
}
@ -1293,6 +1366,8 @@ WRITE8_HANDLER( snes_w_bank6 )
dsp4_write(data);
else
logerror("(PC=%06x) Attempt to write to ROM address: %X\n",cpu_get_pc(space->cpu),offset + 0x800000);
cpu_adjust_icount(space->cpu, -snes_bank_0x80_0xbf_cycles(space->machine, offset));
}
@ -1329,6 +1404,8 @@ WRITE8_HANDLER( snes_w_bank7 )
}
else if (snes_cart.mode & 0x0a)
logerror("(PC=%06x) Attempt to write to ROM address: %X\n",cpu_get_pc(space->cpu),offset + 0xc00000);
cpu_adjust_icount(space->cpu, -(snes_ram[MEMSEL] & 1) ? 6 : 8);
}