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It's a kind of (D)MAgic (sets up basic VRAM)

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This commit is contained in:
Angelo Salese 2015-01-23 23:39:33 +01:00
parent 11534b7c9e
commit b05c21dd69
1 changed files with 70 additions and 6 deletions
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76
src/mess/drivers/c65.c
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@ -29,23 +29,25 @@ public:
m_palette(*this, "palette"),
m_palred(*this, "redpal"),
m_palgreen(*this, "greenpal"),
m_palblue(*this, "bluepal")
m_palblue(*this, "bluepal"),
m_dmalist(*this, "dmalist")
{ }
// devices
required_device<cpu_device> m_maincpu;
required_device<m4510_device> m_maincpu;
required_device<screen_device> m_screen;
required_device<palette_device> m_palette;
required_shared_ptr<UINT8> m_palred;
required_shared_ptr<UINT8> m_palgreen;
required_shared_ptr<UINT8> m_palblue;
required_shared_ptr<UINT8> m_dmalist;
DECLARE_READ8_MEMBER(vic4567_dummy_r);
DECLARE_WRITE8_MEMBER(vic4567_dummy_w);
DECLARE_WRITE8_MEMBER(PalRed_w);
DECLARE_WRITE8_MEMBER(PalGreen_w);
DECLARE_WRITE8_MEMBER(PalBlue_w);
DECLARE_WRITE8_MEMBER(DMAgic_w);
// screen updates
UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
@ -60,6 +62,7 @@ protected:
virtual void video_start();
private:
void PalEntryFlush(UINT8 offset);
void DMAgicExecute(address_space &space,UINT32 address);
};
void c65_state::video_start()
@ -86,7 +89,8 @@ READ8_MEMBER(c65_state::vic4567_dummy_r)
return res;
}
printf("%02x\n",offset); // TODO: PC
if(!space.debugger_access())
printf("%02x\n",offset); // TODO: PC
return res;
}
@ -99,7 +103,10 @@ WRITE8_MEMBER(c65_state::vic4567_dummy_w)
any other write vic-ii mode
*/
//case 0x2f: break;
default: printf("%02x %02x\n",offset,data); break;
default:
if(!space.debugger_access())
printf("%02x %02x\n",offset,data);
break;
}
}
@ -127,6 +134,60 @@ WRITE8_MEMBER(c65_state::PalBlue_w)
PalEntryFlush(offset);
}
void c65_state::DMAgicExecute(address_space &space,UINT32 address)
{
UINT8 cmd;// = space.read_byte(address++);
UINT16 length; //= space.read_byte(address++);
UINT32 src, dst;
static const char *const dma_cmd_string[] =
{
"COPY", // 0
"MIX",
"SWAP",
"FILL"
};
cmd = space.read_byte(address++);
length = space.read_byte(address++);
length|=(space.read_byte(address++)<<8);
src = space.read_byte(address++);
src|=(space.read_byte(address++)<<8);
src|=(space.read_byte(address++)<<16);
dst = space.read_byte(address++);
dst|=(space.read_byte(address++)<<8);
dst|=(space.read_byte(address++)<<16);
switch(cmd & 3)
{
case 3: // fill
{
/* TODO: upper bits of source */
printf("DMAgic %s %02x -> %08x %04x (CHAIN=%s)\n",dma_cmd_string[cmd & 3],src & 0xff,dst,length,cmd & 4 ? "yes" : "no");
UINT8 FillValue;
UINT32 DestIndex;
UINT16 SizeIndex;
FillValue = src & 0xff;
DestIndex = dst & 0xfffff;
SizeIndex = length;
do
{
space.write_byte(DestIndex++,FillValue);
SizeIndex--;
}while(SizeIndex != 0);
}
return;
}
printf("DMAgic %s %08x %08x %04x (CHAIN=%s)\n",dma_cmd_string[cmd & 3],src,dst,length,cmd & 4 ? "yes" : "no");
}
WRITE8_MEMBER(c65_state::DMAgic_w)
{
m_dmalist[offset] = data;
if(offset == 0)
DMAgicExecute(space,(m_dmalist[0])|(m_dmalist[1]<<8)|(m_dmalist[2]<<16));
}
static ADDRESS_MAP_START( c65_map, AS_PROGRAM, 8, c65_state )
AM_RANGE(0x00000, 0x01fff) AM_RAM // TODO: bank
@ -140,12 +201,15 @@ static ADDRESS_MAP_START( c65_map, AS_PROGRAM, 8, c65_state )
// 0x0d400, 0x0d4*f Right SID
// 0x0d440, 0x0d4*f Left SID
// 0x0d600, 0x0d6** UART
// 0x0d700, 0x0d7** DMAgic
AM_RANGE(0x0d700, 0x0d702) AM_WRITE(DMAgic_w) AM_SHARE("dmalist") // 0x0d700, 0x0d7** DMAgic
//AM_RANGE(0x0d703, 0x0d703) AM_READ(DMAgic_r)
// 0x0d800, 0x0d8** Color matrix
// 0x0dc00, 0x0dc** CIA-1
// 0x0dd00, 0x0dd** CIA-2
// 0x0de00, 0x0de** Ext I/O Select 1
AM_RANGE(0x0df00, 0x0dfff) AM_RAM // 0x0df00, 0x0df** Ext I/O Select 2 (RAM window?)
AM_RANGE(0x10000, 0x1f7ff) AM_RAM
AM_RANGE(0x1f800, 0x1ffff) AM_RAM // VRAM
AM_RANGE(0x20000, 0x3ffff) AM_ROM AM_REGION("maincpu",0)
ADDRESS_MAP_END