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/*************************************************************************
RAM device
Provides a configurable amount of RAM to drivers
**************************************************************************/
#ifndef __RAM_H__
#define __RAM_H__
/***************************************************************************
CONSTANTS
***************************************************************************/
#define RAM_TAG "ram"
/***************************************************************************
DEVICE CONFIGURATION MACROS
***************************************************************************/
#define MCFG_RAM_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, RAM, 0)
#define MCFG_RAM_REMOVE(_tag) \
MCFG_DEVICE_REMOVE(_tag)
#define MCFG_RAM_MODIFY(_tag) \
MCFG_DEVICE_MODIFY(_tag) \
ram_device::static_set_extra_options(*device, NULL);
#define MCFG_RAM_DEFAULT_SIZE(_default_size) \
ram_device::static_set_default_size(*device, _default_size);
#define MCFG_RAM_EXTRA_OPTIONS(_extra_options) \
ram_device::static_set_extra_options(*device, _extra_options);
#define MCFG_RAM_DEFAULT_VALUE(_default_value) \
ram_device::static_set_default_value(*device, _default_value);
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
class ram_device : public device_t
{
public:
// construction/destruction
ram_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
// accessors
UINT32 size(void) const { return m_size; }
UINT32 mask(void) const { return m_size - 1; }
UINT8 *pointer(void) const { return m_pointer; }
static UINT32 parse_string(const char *s);
UINT32 default_size(void) const;
const char *extra_options(void) const { return m_extra_options; }
// inline configuration helpers
static void static_set_default_size(device_t &device, const char *default_size) { downcast<ram_device &>(device).m_default_size = default_size; }
static void static_set_extra_options(device_t &device, const char *extra_options) { downcast<ram_device &>(device).m_extra_options = extra_options; }
static void static_set_default_value(device_t &device, UINT8 default_value) { downcast<ram_device &>(device).m_default_value = default_value; }
protected:
virtual void device_start(void);
virtual void device_validity_check(validity_checker &valid) const;
private:
// device state
UINT32 m_size;
UINT8 *m_pointer;
// device config
const char *m_default_size;
const char *m_extra_options;
UINT8 m_default_value;
};
// device type definition
extern const device_type RAM;
// device iterator
typedef device_type_iterator<&device_creator<ram_device>, ram_device> ram_device_iterator;
#endif /* __RAM_H__ */
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