unkts: Hook up new skeleton CPU device

scripts/src/cpu.lua

@@ -3671,10 +3671,17 @@ if opt_tool(CPUS, "MN1610") then
 end
 
 --------------------------------------------------
--- Altera Nios II (disassembler only)
+-- Altera Nios II
 --@src/devices/cpu/nios2/nios2.h,CPUS["NIOS2"] = true
 --------------------------------------------------
 
+if CPUS["NIOS2"] then
+	files {
+		MAME_DIR .. "src/devices/cpu/nios2/nios2.cpp",
+		MAME_DIR .. "src/devices/cpu/nios2/nios2.h",
+	}
+end
+
 if opt_tool(CPUS, "NIOS2") then
 	table.insert(disasm_files , MAME_DIR .. "src/devices/cpu/nios2/nios2dasm.cpp")
 	table.insert(disasm_files , MAME_DIR .. "src/devices/cpu/nios2/nios2dasm.h")

src/devices/cpu/nios2/nios2.cpp

@@ -0,0 +1,62 @@
+// license:BSD-3-Clause
+// copyright-holders:AJR
+/***************************************************************************
+
+    Altera Nios II soft processor
+
+    Currently this device is just a stub with no actual execution core.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "nios2.h"
+#include "nios2dasm.h"
+
+// device type definition
+DEFINE_DEVICE_TYPE(NIOS2, nios2_device, "nios2", "Altera Nios II Processor")
+
+nios2_device::nios2_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+	: cpu_device(mconfig, NIOS2, tag, owner, clock)
+	, m_program_config("program", ENDIANNESS_LITTLE, 32, 32, 0)
+{
+	std::fill(std::begin(m_gpr), std::end(m_gpr), 0);
+}
+
+std::unique_ptr<util::disasm_interface> nios2_device::create_disassembler()
+{
+	return std::make_unique<nios2_disassembler>();
+}
+
+device_memory_interface::space_config_vector nios2_device::memory_space_config() const
+{
+	return space_config_vector {
+		std::make_pair(AS_PROGRAM, &m_program_config)
+	};
+}
+
+void nios2_device::device_start()
+{
+	space(AS_PROGRAM).cache(m_cache);
+
+	set_icountptr(m_icount);
+
+	state_add(NIOS2_PC, "PC", m_pc);
+	state_add(STATE_GENPC, "GENPC", m_pc).noshow();
+	state_add(STATE_GENPCBASE, "CURPC", m_pc).noshow();
+	for (int i = 1; i < 32; i++)
+		state_add(NIOS2_R1 + i - 1, util::string_format("r%d", i).c_str(), m_gpr[i]);
+
+	save_item(NAME(m_gpr));
+	save_item(NAME(m_pc));
+}
+
+void nios2_device::device_reset()
+{
+	m_pc = 0;
+}
+
+void nios2_device::execute_run()
+{
+	debugger_instruction_hook(m_pc);
+	m_icount = 0;
+}

src/devices/cpu/nios2/nios2.h

@@ -0,0 +1,51 @@
+// license:BSD-3-Clause
+// copyright-holders:AJR
+
+#ifndef MAME_CPU_NIOS2_NIOS2_H
+#define MAME_CPU_NIOS2_NIOS2_H
+
+#pragma once
+
+class nios2_device : public cpu_device
+{
+public:
+	enum {
+		NIOS2_R1 = 1, NIOS2_R2, NIOS2_R3, NIOS2_R4, NIOS2_R5, NIOS2_R6, NIOS2_R7,
+		NIOS2_R8, NIOS2_R9, NIOS2_R10, NIOS2_R11, NIOS2_R12, NIOS2_R13, NIOS2_R14, NIOS2_R15,
+		NIOS2_R16, NIOS2_R17, NIOS2_R18, NIOS2_R19, NIOS2_R20, NIOS2_R21, NIOS2_R22, NIOS2_R23,
+		NIOS2_R24, NIOS2_R25, NIOS2_R26, NIOS2_R27, NIOS2_R28, NIOS2_R29, NIOS2_R30, NIOS2_R31,
+		NIOS2_PC,
+	};
+
+	// construction/destruction
+	nios2_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+protected:
+	// device-level overrides
+	virtual void device_start() override;
+	virtual void device_reset() override;
+
+	// device_execute_interface overrides
+	virtual void execute_run() override;
+
+	// device_disasm_interface overrides
+	virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
+
+	// device_memory_interface overrides
+	virtual space_config_vector memory_space_config() const override;
+
+private:
+	// address space
+	address_space_config m_program_config;
+	memory_access<32, 2, 0, ENDIANNESS_LITTLE>::cache m_cache;
+
+	// internal registers
+	u32 m_gpr[32];
+	u32 m_pc;
+	s32 m_icount;
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(NIOS2, nios2_device)
+
+#endif // MAME_CPU_NIOS2_NIOS2_H

src/mame/misc/truesys.cpp

@@ -15,14 +15,14 @@ M4T28 TimeKeeper
 IS42S16 SDRAM
 2x RAMs (type not readable)
 
-It seems the game is run by a soft CPU core programmed in the FPGA.
+It seems the game is run by a Nios II soft CPU core programmed in the FPGA.
 The main CPU ROMs contains strings in English (system stuff) and Spanish (game strings).
 Manufacturer is unknown. There is an Azkoyen string in ROM, but it's probably the bill validator manufacturer.
 */
 
 #include "emu.h"
 
-#include "cpu/h8/h8s2320.h"
+#include "cpu/nios2/nios2.h"
 
 #include "screen.h"
 #include "speaker.h"
@@ -55,6 +55,7 @@ uint32_t truesys_state::screen_update(screen_device &screen, bitmap_rgb32 &bitma
 
 void truesys_state::main_map(address_map &map)
 {
+	map(0x00000000, 0x0007ffff).rom().region("maincpu", 0); // also mirrored at 0x00800000, 0x01000000, 0x01800000, etc.?
 }
 
 
@@ -74,7 +75,7 @@ INPUT_PORTS_END
 void truesys_state::unkts(machine_config &config)
 {
 	// basic machine hardware
-	H8S2328(config, m_maincpu, 32_MHz_XTAL); // TODO: there's no actual CPU, it appears to be run from the FPGA
+	NIOS2(config, m_maincpu, 32'000'000); // there's no actual CPU, it appears to be run from the FPGA
 	m_maincpu->set_addrmap(AS_PROGRAM, &truesys_state::main_map);
 
 	// PIC16F874. TODO: not emulated