// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** devcpu.cpp CPU device definitions. ***************************************************************************/ #include "emu.h" #include "emuopts.h" #include //************************************************************************** // CPU RUNNING DEVICE //************************************************************************** //------------------------------------------------- // cpu_device - constructor //------------------------------------------------- cpu_device::cpu_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock) : device_t(mconfig, type, tag, owner, clock), device_execute_interface(mconfig, *this), device_memory_interface(mconfig, *this), device_state_interface(mconfig, *this), device_disasm_interface(mconfig, *this), m_force_no_drc(false), m_access_to_be_redone(false), m_access_before_delay_tag(nullptr) { } //------------------------------------------------- // cpu_device - destructor //------------------------------------------------- cpu_device::~cpu_device() { } //------------------------------------------------- // allow_drc - return true if DRC is allowed //------------------------------------------------- bool cpu_device::allow_drc() const { return mconfig().options().drc() && !m_force_no_drc; } bool cpu_device::cpu_is_interruptible() const { return false; } bool cpu_device::access_before_time(u64 access_time, u64 current_time) noexcept { s32 delta = access_time - current_time; if(*m_icountptr <= delta) { defer_access(); return true; } *m_icountptr -= delta; return false; } bool cpu_device::access_before_delay(u32 cycles, const void *tag) noexcept { if(tag == m_access_before_delay_tag) { m_access_before_delay_tag = nullptr; return false; } *m_icountptr -= cycles; if(*m_icountptr <= 0) { m_access_before_delay_tag = tag; m_access_to_be_redone = true; return true; } m_access_before_delay_tag = nullptr; return false; } void cpu_device::access_after_delay(u32 cycles) noexcept { *m_icountptr -= cycles; } void cpu_device::defer_access() noexcept { if(*m_icountptr > 0) *m_icountptr = 0; m_access_to_be_redone = true; } void cpu_device::retry_access() noexcept { abort_timeslice(); m_access_to_be_redone = true; }