summaryrefslogblamecommitdiffstatshomepage
path: root/src/devices/machine/nvram.h
blob: a25cc665988eda4fa69a329b7c3ee213a4e4e2e2 (plain) (tree)
1
2
3
4
5
6
7
8
9
10

                                





                                                                            

                                                                            

                            
 
            
 
                                        
                                                                             
 
       


                                                                                     





                               

                               

          
                                   





                                                                                                          

                                       
                                                                                
                                                                      

                                                 
                                                               
         
 




                                                                                      
                                             

                                           


                                                          
 

                                    
 
                              
                                             
                                                    
                                               

                        

                                             

  
                                        
 
                                      
// 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<void (nvram_device &, void *, size_t)> 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 <typename... T> void set_custom_handler(T &&... args)
	{
		m_default_value = DEFAULT_CUSTOM;
		m_custom_handler.set(std::forward<T>(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 void nvram_read(emu_file &file) override;
	virtual void nvram_write(emu_file &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