// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** nvram.h Generic non-volatile RAM. ***************************************************************************/ #ifndef MAME_MACHINE_NVRAM_H #define MAME_MACHINE_NVRAM_H #pragma once class nvram_device : public device_t, public device_nvram_interface { public: // custom initialization for default state typedef device_delegate init_delegate; // values enum default_value { DEFAULT_ALL_0, DEFAULT_ALL_1, DEFAULT_RANDOM, DEFAULT_CUSTOM, DEFAULT_NONE }; // construction/destruction nvram_device(const machine_config &mconfig, const char *tag, device_t *owner, default_value value) : nvram_device(mconfig, tag, owner, 0) { set_default_value(value); } nvram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0); // inline configuration helpers void set_default_value(default_value value) { m_default_value = value; } template void set_custom_handler(T &&... args) { m_default_value = DEFAULT_CUSTOM; m_custom_handler.set(std::forward(args)...); } // controls void set_base(void *base, size_t length) { m_base = base; m_length = length; } protected: // device-level overrides virtual void device_start() override; // device_nvram_interface overrides virtual void nvram_default() override; virtual bool nvram_read(util::read_stream &file) override; virtual bool nvram_write(util::write_stream &file) override; // internal helpers void determine_final_base(); // configuration state optional_memory_region m_region; default_value m_default_value; init_delegate m_custom_handler; // runtime state void * m_base; size_t m_length; }; DECLARE_DEVICE_TYPE(NVRAM, nvram_device) #endif // MAME_DEVICES_MACHINE_NVRAM_H