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Diffstat (limited to 'src/devices/cpu/romp/romp.h')
-rw-r--r-- | src/devices/cpu/romp/romp.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/devices/cpu/romp/romp.h b/src/devices/cpu/romp/romp.h new file mode 100644 index 00000000000..bcbc163214d --- /dev/null +++ b/src/devices/cpu/romp/romp.h @@ -0,0 +1,96 @@ +// license:BSD-3-Clause +// copyright-holders:Patrick Mackinlay + +#ifndef MAME_CPU_ROMP_ROMP_H +#define MAME_CPU_ROMP_ROMP_H + +#pragma once + +class romp_device : public cpu_device +{ +public: + romp_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock); + +protected: + enum registers : unsigned + { + ROMP_SCR = 0, + ROMP_GPR = 16, + }; + + enum scr : unsigned + { + COS = 6, // counter source + COU = 7, // counter + TS = 8, // timer status + MQ = 10, // multiplier quotient + MCS = 11, // machine check status + PCS = 11, // program check status + IRB = 12, // interrupt request buffer + IAR = 13, // instruction address register + ICS = 14, // interrupt control status + CS = 15, // condition status + }; + + enum cs : unsigned + { + TB = 0, // test bit + OV = 1, // overflow + // reserved + C0 = 3, // carry zero + GT = 4, // greater than + EQ = 5, // equal + LT = 6, // less than + PZ = 7, // permanent zero + }; + + // device_t overrides + virtual void device_start() override; + virtual void device_reset() override; + + // device_execute_interface overrides + virtual u32 execute_min_cycles() const noexcept override { return 1; } + virtual u32 execute_max_cycles() const noexcept override { return 40; } + virtual u32 execute_input_lines() const noexcept override { return 6; } + virtual void execute_run() override; + virtual void execute_set_input(int inputnum, int state) override; + + // device_memory_interface overrides + virtual space_config_vector memory_space_config() const override; + virtual bool memory_translate(int spacenum, int intention, offs_t &address) override; + + // device_disasm_interface overrides + virtual std::unique_ptr<util::disasm_interface> create_disassembler() override; + +private: + // insruction decode helpers + u32 r3_0(unsigned reg) const { return reg ? m_gpr[reg] : 0; } + s32 ji(u16 op) const { return s32(s8(op)) << 1; } + u32 ba(u16 hi, u16 lo) const { return ((u32(hi) << 16) | lo) & 0x00ff'fffeU; } + s32 bi(u16 hi, u16 lo) const { return s32((u32(hi) << 16 | lo) << 12) >> 11; } + + // address spaces + address_space_config const m_mem_config; + address_space_config const m_io_config; + + // mame state + int m_icount; + + // core registers + u32 m_scr[16]; + u32 m_gpr[16]; + + // internal state + enum branch_state : unsigned + { + NONE = 0, + SUBJECT = 1, // branch subject instruction active + BRANCH = 2, // branch instruction active + } + m_branch_state; + u32 m_branch_target; +}; + +DECLARE_DEVICE_TYPE(ROMP, romp_device) + +#endif // MAME_CPU_ROMP_ROMP_H |