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Diffstat (limited to 'src/devices/bus/lpci/northbridge.c')
-rw-r--r-- | src/devices/bus/lpci/northbridge.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/devices/bus/lpci/northbridge.c b/src/devices/bus/lpci/northbridge.c new file mode 100644 index 00000000000..ec5a0a8582a --- /dev/null +++ b/src/devices/bus/lpci/northbridge.c @@ -0,0 +1,48 @@ +// license:BSD-3-Clause +// copyright-holders:Miodrag Milanovic +/*************************************************************************** + + Northbridge implementation + +***************************************************************************/ + +#include "emu.h" +#include "northbridge.h" + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +northbridge_device::northbridge_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) + : device_t(mconfig, type, name, tag, owner, clock, shortname, source), + m_maincpu(*this, ":maincpu"), + m_ram(*this, ":" RAM_TAG) +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void northbridge_device::device_start() +{ + address_space& space = machine().device(":maincpu")->memory().space(AS_PROGRAM); + + machine().root_device().membank("bank10")->set_base(m_ram->pointer()); + + if (m_ram->size() > 0x0a0000) + { + offs_t ram_limit = 0x100000 + m_ram->size() - 0x0a0000; + space.install_read_bank(0x100000, ram_limit - 1, "bank1"); + space.install_write_bank(0x100000, ram_limit - 1, "bank1"); + machine().root_device().membank("bank1")->set_base(m_ram->pointer() + 0xa0000); + } +} + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void northbridge_device::device_reset() +{ +} |