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// license:BSD-3-Clause
// copyright-holders:Nathan Woods, Dirk Best
/*************************************************************************
RAM device
Provides a configurable amount of RAM to drivers
**************************************************************************/
#ifndef MAME_MACHINE_RAM_H
#define MAME_MACHINE_RAM_H
#pragma once
#include <memory>
#include <utility>
#include <vector>
/***************************************************************************
CONSTANTS
***************************************************************************/
#define RAM_TAG "ram"
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
class ram_device : public device_t
{
public:
using extra_option = std::pair<std::string, u32>;
using extra_option_vector = std::vector<extra_option>;
// construction/destruction
ram_device(machine_config const &mconfig, char const *tag, device_t *owner, const XTAL &clock = XTAL());
// accessors
u32 size() const { return m_size; }
u32 mask() const { return m_size - 1; }
u8 *pointer() { return &m_pointer[0]; }
char const *default_size_string() const { return m_default_size; }
u32 default_size() const;
extra_option_vector const &extra_options() const;
// read/write
u8 read(offs_t offset) { return m_pointer[offset % m_size]; }
void write(offs_t offset, u8 data) { m_pointer[offset % m_size] = data; }
// inline configuration helpers
ram_device &set_default_size(char const *default_size) { m_default_size = default_size; return *this; }
ram_device &set_extra_options(char const *extra_options)
{
m_extra_options_string = extra_options && extra_options[0] ? extra_options : nullptr;
m_extra_options.clear();
return *this;
}
ram_device &set_default_value(u8 default_value) { m_default_value = default_value; return *this; }
protected:
virtual void device_start() override;
virtual void device_validity_check(validity_checker &valid) const override;
private:
bool is_valid_size(u32 size) const;
// device state
u32 m_size;
std::unique_ptr<u8 []> m_pointer;
// device config
char const * m_default_size;
u8 m_default_value;
mutable extra_option_vector m_extra_options;
char const * m_extra_options_string;
};
// device type definition
DECLARE_DEVICE_TYPE(RAM, ram_device)
// device iterator
typedef device_type_enumerator<ram_device> ram_device_enumerator;
#endif // MAME_MACHINE_RAM_H
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