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Diffstat (limited to 'src/devices/cpu/m68000/scc68070.cpp')
-rw-r--r--src/devices/cpu/m68000/scc68070.cpp54
1 files changed, 54 insertions, 0 deletions
diff --git a/src/devices/cpu/m68000/scc68070.cpp b/src/devices/cpu/m68000/scc68070.cpp
new file mode 100644
index 00000000000..cca40fe092f
--- /dev/null
+++ b/src/devices/cpu/m68000/scc68070.cpp
@@ -0,0 +1,54 @@
+// license:BSD-3-Clause
+// copyright-holders:Karl Stenerud
+
+#include "emu.h"
+#include "scc68070.h"
+#include "m68kdasm.h"
+
+std::unique_ptr<util::disasm_interface> scc68070_base_device::create_disassembler()
+{
+ return std::make_unique<m68k_disassembler>(m68k_disassembler::TYPE_68000);
+}
+
+
+scc68070_base_device::scc68070_base_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock,
+ const device_type type, address_map_constructor internal_map)
+ : m68000_musashi_device(mconfig, tag, owner, clock, type, 16,32, internal_map)
+{
+}
+
+void scc68070_base_device::device_start()
+{
+ m68000_musashi_device::device_start();
+ init_cpu_scc68070();
+
+ m_readimm16 = [this](offs_t address) -> u16 { return m_oprogram16.read_word(translate_addr(address)); };
+ m_read8 = [this](offs_t address) -> u8 { return m_program16.read_byte(translate_addr(address)); };
+ m_read16 = [this](offs_t address) -> u16 { return m_program16.read_word(translate_addr(address)); };
+ m_read32 = [this](offs_t address) -> u32 { return m_program16.read_dword(translate_addr(address)); };
+ m_write8 = [this](offs_t address, u8 data)
+ {
+ address = translate_addr(address);
+ m_program16.write_word(address & ~1, data | (data << 8), address & 1 ? 0x00ff : 0xff00);
+ };
+ m_write16 = [this](offs_t address, u16 data) { m_program16.write_word(translate_addr(address), data); };
+ m_write32 = [this](offs_t address, u32 data) { m_program16.write_dword(translate_addr(address), data); };
+}
+
+offs_t scc68070_base_device::translate_addr(offs_t address) const
+{
+ // internal addresses (0x80000000-bfffffff) are only accessible in supervisor mode;
+ // all other accesses use the external 24-bit address bus.
+ if (!(supervisor_mode() && (address >> 30) == 0x2))
+ address &= 0xffffff;
+
+ return address;
+}
+
+bool scc68070_base_device::memory_translate(int spacenum, int intention, offs_t &address, address_space *&target_space)
+{
+ target_space = &space(spacenum);
+ if (spacenum == AS_PROGRAM)
+ address = translate_addr(address);
+ return true;
+}