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(MESS) vboy uses no bankswitch, so we can gain back most

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speed with the same direct rom mapping used for gba. nw.
This commit is contained in:
Fabio Priuli 2014-10-04 03:48:09 +00:00
parent 0210f1ea04
commit fa3c75a7b3
2 changed files with 24 additions and 4 deletions
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10
src/emu/bus/vboy/slot.c
View File

@ -171,8 +171,10 @@ bool vboy_cart_slot_device::call_load()
seterror(IMAGE_ERROR_UNSPECIFIED, "Unsupported cartridge size"); seterror(IMAGE_ERROR_UNSPECIFIED, "Unsupported cartridge size");
return IMAGE_INIT_FAIL; return IMAGE_INIT_FAIL;
} }
m_cart->rom_alloc(len, tag()); // always alloc 0x200000 so to be able to directly map the region
// to the address map (speeding up emulation a bit)
m_cart->rom_alloc(0x200000, tag());
if (has_eeprom) if (has_eeprom)
m_cart->eeprom_alloc(get_software_region_length("eeprom")); m_cart->eeprom_alloc(get_software_region_length("eeprom"));
@ -183,6 +185,10 @@ bool vboy_cart_slot_device::call_load()
else else
memcpy(ROM, get_software_region("rom"), len); memcpy(ROM, get_software_region("rom"), len);
if (len < 0x080000) { memcpy(ROM + 0x040000, ROM, 0x040000); }
if (len < 0x100000) { memcpy(ROM + 0x080000, ROM, 0x080000); }
if (len < 0x200000) { memcpy(ROM + 0x100000, ROM, 0x100000); }
if (software_entry() == NULL) if (software_entry() == NULL)
m_type = vboy_get_pcb_id("vb_rom"); m_type = vboy_get_pcb_id("vb_rom");
else else

18
src/mess/drivers/vboy.c
View File

@ -157,6 +157,7 @@ public:
required_device<vboy_cart_slot_device> m_cart; required_device<vboy_cart_slot_device> m_cart;
required_device<timer_device> m_maintimer; required_device<timer_device> m_maintimer;
required_device<palette_device> m_palette; required_device<palette_device> m_palette;
memory_region *m_cart_rom;
DECLARE_READ32_MEMBER(io_r); DECLARE_READ32_MEMBER(io_r);
DECLARE_WRITE32_MEMBER(io_w); DECLARE_WRITE32_MEMBER(io_w);
@ -1111,7 +1112,7 @@ static ADDRESS_MAP_START( vboy_mem, AS_PROGRAM, 32, vboy_state )
//AM_RANGE( 0x04000000, 0x04ffffff ) // Expansion area //AM_RANGE( 0x04000000, 0x04ffffff ) // Expansion area
AM_RANGE( 0x05000000, 0x0500ffff ) AM_MIRROR(0x0ff0000) AM_RAM AM_SHARE("wram")// Main RAM - 64K mask 0xffff AM_RANGE( 0x05000000, 0x0500ffff ) AM_MIRROR(0x0ff0000) AM_RAM AM_SHARE("wram")// Main RAM - 64K mask 0xffff
AM_RANGE( 0x06000000, 0x06003fff ) AM_DEVREADWRITE("cartslot", vboy_cart_slot_device, read_eeprom, write_eeprom) // Cart RAM - 8K NVRAM AM_RANGE( 0x06000000, 0x06003fff ) AM_DEVREADWRITE("cartslot", vboy_cart_slot_device, read_eeprom, write_eeprom) // Cart RAM - 8K NVRAM
AM_RANGE( 0x07000000, 0x071fffff ) AM_MIRROR(0x0e00000) AM_DEVREAD("cartslot", vboy_cart_slot_device, read_cart) /* ROM */ // AM_RANGE( 0x07000000, 0x071fffff ) AM_MIRROR(0x0e00000) AM_DEVREAD("cartslot", vboy_cart_slot_device, read_cart) /* ROM */
ADDRESS_MAP_END ADDRESS_MAP_END
static ADDRESS_MAP_START( vboy_io, AS_IO, 32, vboy_state ) static ADDRESS_MAP_START( vboy_io, AS_IO, 32, vboy_state )
@ -1140,7 +1141,7 @@ static ADDRESS_MAP_START( vboy_io, AS_IO, 32, vboy_state )
// AM_RANGE( 0x04000000, 0x04ffffff ) // Expansion area // AM_RANGE( 0x04000000, 0x04ffffff ) // Expansion area
AM_RANGE( 0x05000000, 0x0500ffff ) AM_MIRROR(0x0ff0000) AM_RAM AM_SHARE("wram") // Main RAM - 64K mask 0xffff AM_RANGE( 0x05000000, 0x0500ffff ) AM_MIRROR(0x0ff0000) AM_RAM AM_SHARE("wram") // Main RAM - 64K mask 0xffff
AM_RANGE( 0x06000000, 0x06003fff ) AM_NOP // Cart RAM - 8K NVRAM ? AM_RANGE( 0x06000000, 0x06003fff ) AM_NOP // Cart RAM - 8K NVRAM ?
AM_RANGE( 0x07000000, 0x071fffff ) AM_MIRROR(0x0e00000) AM_DEVREAD("cartslot", vboy_cart_slot_device, read_cart) /* ROM */ // AM_RANGE( 0x07000000, 0x071fffff ) AM_MIRROR(0x0e00000) AM_DEVREAD("cartslot", vboy_cart_slot_device, read_cart) /* ROM */
ADDRESS_MAP_END ADDRESS_MAP_END
/* Input ports */ /* Input ports */
@ -1167,8 +1168,21 @@ INPUT_PORTS_END
void vboy_state::machine_start() void vboy_state::machine_start()
{ {
// install the cart ROM as a bank into the address map.
// this speeds up the rom access, by skipping the m_cart->read_rom
// trampoline (but forces us to alloc always a 0x200000-wide region)
if (m_cart->exists()) if (m_cart->exists())
{
astring region_tag;
m_cart_rom = memregion(region_tag.cpy(m_cart->tag()).cat(VBOYSLOT_ROM_REGION_TAG));
m_maincpu->space(AS_PROGRAM).install_read_bank(0x07000000, 0x071fffff, 0, 0x0e00000, "prog_cart_bank");
m_maincpu->space(AS_IO).install_read_bank(0x07000000, 0x071fffff, 0, 0x0e00000, "io_cart_bank");
membank("prog_cart_bank")->set_base(m_cart_rom->base());
membank("io_cart_bank")->set_base(m_cart_rom->base());
m_cart->save_eeprom(); m_cart->save_eeprom();
}
} }
void vboy_state::machine_reset() void vboy_state::machine_reset()