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-rw-r--r--lib/nes/ref/cpu.hh298
1 files changed, 0 insertions, 298 deletions
diff --git a/lib/nes/ref/cpu.hh b/lib/nes/ref/cpu.hh
deleted file mode 100644
index 05efe56..0000000
--- a/lib/nes/ref/cpu.hh
+++ /dev/null
@@ -1,298 +0,0 @@
-#pragma once
-
-#include "nes/util/cycle-count.hh"
-#include "nes/util/address.hh"
-
-namespace nes
-{
- struct snapshot;
-} // namespace nes
-
-namespace nes::ref
-{
- class ppu;
- class controller;
- class mapper;
-
- class cpu
- {
- static constexpr auto ram_size = std::size_t{ 0x800 };
- static constexpr auto stack_offset = address{ 0x100 };
-
- cycle_count current_cycles_;
- ppu& ppu_;
- mapper& mapper_;
- controller& controller_1_;
- controller& controller_2_;
- std::uint8_t ram_[ram_size]{};
- bool nmi_pending_{ false };
-
- // Registers
- struct
- {
- std::uint16_t pc{ 0 };
- std::uint8_t sp{ 0xFD };
- std::uint8_t a{ 0 };
- std::uint8_t x{ 0 };
- std::uint8_t y{ 0 };
- union
- {
- struct
- {
- bool c : 1; // carry
- bool z : 1; // zero
- bool i : 1; // interrupt inhibit
- bool d : 1; // decimal
- bool b : 1; // break
- bool : 1; // (unused, always true)
- bool v : 1; // overflow
- bool n : 1; // negative
- };
- std::uint8_t p{ 0b00100100 }; // initially, set i = true
- };
- } registers_{};
-
- enum class addressing_mode
- {
- accumulator, // A
- immediate, // #v
- zero_page, // d
- absolute, // a
- relative, // *+d
- indirect, // (a)
- zero_page_indexed_x, // d,x
- zero_page_indexed_y, // d,y
- absolute_indexed_x, // a,x
- absolute_indexed_y, // a,y
- indexed_indirect, // (d,x)
- indirect_indexed, // (d),y
- };
-
- enum class force_page_crossing
- {
- no,
- yes,
- };
-
- template<addressing_mode>
- class operand
- {
- cpu& cpu_;
- address address_;
- cycle_count cycles_;
-
- public:
- explicit operand(cpu& cpu, address const address, cycle_count const cycles)
- : cpu_{ cpu }
- , address_{ address }
- , cycles_{ cycles }
- {
- }
-
- auto read() -> std::uint8_t { return cpu_.read8(address_); }
- auto write(std::uint8_t const value) -> void { cpu_.write8(address_, value); }
- auto get_address() -> address { return address_; }
- auto get_cycles() -> cycle_count { return cycles_; }
- };
-
- template<>
- class operand<addressing_mode::accumulator>
- {
- cpu& cpu_;
-
- public:
- explicit operand(cpu& cpu)
- : cpu_{ cpu }
- {
- }
-
- auto read() -> std::uint8_t { return cpu_.registers_.a; }
- auto write(std::uint8_t const value) -> void { cpu_.registers_.a = value; }
- auto get_cycles() -> cycle_count { return cycle_count::from_cpu(2); }
- };
-
- template<>
- class operand<addressing_mode::immediate>
- {
- std::uint8_t value_{ 0 };
-
- public:
- explicit operand(std::uint8_t const value)
- : value_{ value }
- {
- }
-
- auto read() -> std::uint8_t { return value_; }
- auto get_cycles() -> cycle_count { return cycle_count::from_cpu(2); }
- };
-
- public:
- explicit cpu(ppu&, mapper&, controller& controller_1, controller& controller_2);
-
- cpu(cpu const&) = delete;
- cpu(cpu&&) = delete;
- auto operator=(cpu const&) -> cpu& = delete;
- auto operator=(cpu&&) -> cpu& = delete;
-
- auto get_cycles() const -> cycle_count { return current_cycles_; }
- auto build_snapshot(snapshot&) -> void;
- auto stall_cycles(cycle_count) -> void;
- auto trigger_nmi() -> void;
- auto step() -> void;
- auto is_nmi_pending() const -> bool { return nmi_pending_; } // XXX: Debugging
-
- // Memory access
-
- auto read8(address) -> std::uint8_t;
- auto read16(address) -> std::uint16_t;
- auto write8(address, std::uint8_t) -> void;
- auto write16(address, std::uint16_t) -> void;
-
- private:
- // Instructions
-
-#define DEFINE_SIMPLE_INSTRUCTION(name) \
- auto run_##name() -> void;
-#define DEFINE_OPERAND_INSTRUCTION(name) \
- template<addressing_mode Mode> auto run_##name() -> void;
-
- DEFINE_OPERAND_INSTRUCTION(brk)
- DEFINE_OPERAND_INSTRUCTION(ora)
- DEFINE_SIMPLE_INSTRUCTION(stp)
- DEFINE_OPERAND_INSTRUCTION(slo)
- DEFINE_OPERAND_INSTRUCTION(nop)
- DEFINE_SIMPLE_INSTRUCTION(nop)
- DEFINE_SIMPLE_INSTRUCTION(php)
- DEFINE_OPERAND_INSTRUCTION(asl)
- DEFINE_OPERAND_INSTRUCTION(anc)
- DEFINE_OPERAND_INSTRUCTION(bpl)
- DEFINE_SIMPLE_INSTRUCTION(clc)
- DEFINE_OPERAND_INSTRUCTION(jsr)
- DEFINE_OPERAND_INSTRUCTION(and)
- DEFINE_OPERAND_INSTRUCTION(rla)
- DEFINE_OPERAND_INSTRUCTION(bit)
- DEFINE_OPERAND_INSTRUCTION(rol)
- DEFINE_SIMPLE_INSTRUCTION(plp)
- DEFINE_OPERAND_INSTRUCTION(bmi)
- DEFINE_SIMPLE_INSTRUCTION(sec)
- DEFINE_SIMPLE_INSTRUCTION(rti)
- DEFINE_OPERAND_INSTRUCTION(eor)
- DEFINE_OPERAND_INSTRUCTION(sre)
- DEFINE_OPERAND_INSTRUCTION(lsr)
- DEFINE_OPERAND_INSTRUCTION(alr)
- DEFINE_SIMPLE_INSTRUCTION(pha)
- DEFINE_OPERAND_INSTRUCTION(jmp)
- DEFINE_OPERAND_INSTRUCTION(bvc)
- DEFINE_SIMPLE_INSTRUCTION(cli)
- DEFINE_SIMPLE_INSTRUCTION(rts)
- DEFINE_OPERAND_INSTRUCTION(adc)
- DEFINE_OPERAND_INSTRUCTION(rra)
- DEFINE_OPERAND_INSTRUCTION(ror)
- DEFINE_OPERAND_INSTRUCTION(arr)
- DEFINE_SIMPLE_INSTRUCTION(pla)
- DEFINE_OPERAND_INSTRUCTION(bvs)
- DEFINE_SIMPLE_INSTRUCTION(sei)
- DEFINE_OPERAND_INSTRUCTION(sta)
- DEFINE_OPERAND_INSTRUCTION(ahx)
- DEFINE_OPERAND_INSTRUCTION(sax)
- DEFINE_OPERAND_INSTRUCTION(sty)
- DEFINE_OPERAND_INSTRUCTION(stx)
- DEFINE_SIMPLE_INSTRUCTION(dey)
- DEFINE_SIMPLE_INSTRUCTION(txa)
- DEFINE_OPERAND_INSTRUCTION(xaa)
- DEFINE_OPERAND_INSTRUCTION(bcc)
- DEFINE_SIMPLE_INSTRUCTION(tya)
- DEFINE_SIMPLE_INSTRUCTION(txs)
- DEFINE_OPERAND_INSTRUCTION(tas)
- DEFINE_OPERAND_INSTRUCTION(shy)
- DEFINE_OPERAND_INSTRUCTION(shx)
- DEFINE_OPERAND_INSTRUCTION(ldy)
- DEFINE_OPERAND_INSTRUCTION(lda)
- DEFINE_OPERAND_INSTRUCTION(ldx)
- DEFINE_OPERAND_INSTRUCTION(lax)
- DEFINE_SIMPLE_INSTRUCTION(tay)
- DEFINE_SIMPLE_INSTRUCTION(tax)
- DEFINE_OPERAND_INSTRUCTION(bcs)
- DEFINE_SIMPLE_INSTRUCTION(clv)
- DEFINE_SIMPLE_INSTRUCTION(tsx)
- DEFINE_OPERAND_INSTRUCTION(las)
- DEFINE_OPERAND_INSTRUCTION(cpy)
- DEFINE_OPERAND_INSTRUCTION(axs)
- DEFINE_OPERAND_INSTRUCTION(cmp)
- DEFINE_OPERAND_INSTRUCTION(dcp)
- DEFINE_OPERAND_INSTRUCTION(dec)
- DEFINE_SIMPLE_INSTRUCTION(iny)
- DEFINE_SIMPLE_INSTRUCTION(dex)
- DEFINE_OPERAND_INSTRUCTION(bne)
- DEFINE_SIMPLE_INSTRUCTION(cld)
- DEFINE_OPERAND_INSTRUCTION(cpx)
- DEFINE_OPERAND_INSTRUCTION(sbc)
- DEFINE_OPERAND_INSTRUCTION(isc)
- DEFINE_OPERAND_INSTRUCTION(inc)
- DEFINE_SIMPLE_INSTRUCTION(inx)
- DEFINE_OPERAND_INSTRUCTION(beq)
- DEFINE_SIMPLE_INSTRUCTION(sed)
-
-#undef DEFINE_SIMPLE_INSTRUCTION
-#undef DEFINE_OPERAND_INSTRUCTION
-
- // Helpers
-
- auto advance_pc8() -> std::uint8_t;
- auto advance_pc16() -> std::uint16_t;
- auto push_stack8(std::uint8_t) -> void;
- auto push_stack16(std::uint16_t) -> void;
- auto pop_stack8() -> std::uint8_t;
- auto pop_stack16() -> std::uint16_t;
- auto update_zn(std::uint8_t value) -> void;
- template<addressing_mode Mode>
- auto branch(bool condition) -> void;
- auto execute_interrupt(address) -> void;
-
- auto eval_ror(std::uint8_t arg) -> std::uint8_t;
- auto eval_rol(std::uint8_t arg) -> std::uint8_t;
- auto eval_asl(std::uint8_t arg) -> std::uint8_t;
- auto eval_lsr(std::uint8_t arg) -> std::uint8_t;
- auto eval_adc(std::uint8_t arg) -> void;
- auto eval_and(std::uint8_t arg) -> void;
- auto eval_ora(std::uint8_t arg) -> void;
- auto eval_eor(std::uint8_t arg) -> void;
- auto eval_cmp(std::uint8_t a, std::uint8_t b) -> void;
- auto eval_plp() -> void;
- auto eval_php() -> void;
-
- // Operands
-
-#define DEFINE_CYCLE_COUNT(name) \
- template<addressing_mode Mode> static auto name##_cycle_count() -> cycle_count;
-#define DEFINE_CYCLE_COUNT_INSTANCE(name, mode, value) \
- template<> auto name##_cycle_count<addressing_mode::mode>() -> cycle_count { return cycle_count::from_cpu(value); }
-
- DEFINE_CYCLE_COUNT(jump)
- DEFINE_CYCLE_COUNT_INSTANCE(jump, absolute, 3)
- DEFINE_CYCLE_COUNT_INSTANCE(jump, indirect, 5)
-
- DEFINE_CYCLE_COUNT(shift)
- DEFINE_CYCLE_COUNT_INSTANCE(shift, accumulator, 2)
- DEFINE_CYCLE_COUNT_INSTANCE(shift, zero_page, 5)
- DEFINE_CYCLE_COUNT_INSTANCE(shift, zero_page_indexed_x, 6)
- DEFINE_CYCLE_COUNT_INSTANCE(shift, absolute, 6)
- DEFINE_CYCLE_COUNT_INSTANCE(shift, absolute_indexed_x, 7)
-
- DEFINE_CYCLE_COUNT(inc_dec)
- DEFINE_CYCLE_COUNT_INSTANCE(inc_dec, zero_page, 5)
- DEFINE_CYCLE_COUNT_INSTANCE(inc_dec, zero_page_indexed_x, 6)
- DEFINE_CYCLE_COUNT_INSTANCE(inc_dec, absolute, 6)
- DEFINE_CYCLE_COUNT_INSTANCE(inc_dec, absolute_indexed_x, 7)
-
-#undef DEFINE_CYCLE_COUNT
-#undef DEFINE_CYCLE_COUNT_INSTANCE
-
- template<addressing_mode Mode>
- auto fetch_operand(force_page_crossing = force_page_crossing::no) -> operand<Mode>;
- template<>
- auto fetch_operand<addressing_mode::accumulator>(force_page_crossing) -> operand<addressing_mode::accumulator>;
- template<>
- auto fetch_operand<addressing_mode::immediate>(force_page_crossing) -> operand<addressing_mode::immediate>;
- };
-} // namespace nes::ref \ No newline at end of file
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