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+/***************************************************************************
+
+ nvram.h
+
+ Generic non-volatile RAM.
+
+****************************************************************************
+
+ Copyright Aaron Giles
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are
+ met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name 'MAME' nor the names of its contributors may be
+ used to endorse or promote products derived from this software
+ without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR
+ IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
+ INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+
+***************************************************************************/
+
+#pragma once
+
+#ifndef __NVRAM_H__
+#define __NVRAM_H__
+
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_NVRAM_ADD_0FILL(_tag) \
+ MCFG_DEVICE_ADD(_tag, NVRAM, 0) \
+ nvram_device::static_set_default_value(*device, nvram_device::DEFAULT_ALL_0); \
+
+#define MCFG_NVRAM_ADD_1FILL(_tag) \
+ MCFG_DEVICE_ADD(_tag, NVRAM, 0) \
+ nvram_device::static_set_default_value(*device, nvram_device::DEFAULT_ALL_1); \
+
+#define MCFG_NVRAM_ADD_RANDOM_FILL(_tag) \
+ MCFG_DEVICE_ADD(_tag, NVRAM, 0) \
+ nvram_device::static_set_default_value(*device, nvram_device::DEFAULT_RANDOM); \
+
+#define MCFG_NVRAM_ADD_NO_FILL(_tag) \
+ MCFG_DEVICE_ADD(_tag, NVRAM, 0) \
+ nvram_device::static_set_default_value(*device, nvram_device::DEFAULT_NONE); \
+
+#define MCFG_NVRAM_ADD_CUSTOM_DRIVER(_tag, _class, _method) \
+ MCFG_DEVICE_ADD(_tag, NVRAM, 0) \
+ nvram_device::static_set_custom_handler(*device, nvram_init_delegate(&_class::_method, #_class "::" #_method, NULL, (_class *)0)); \
+
+
+#define MCFG_NVRAM_REPLACE_0FILL(_tag) \
+ MCFG_DEVICE_REPLACE(_tag, NVRAM, 0) \
+ nvram_device::static_set_default_value(*device, nvram_device::DEFAULT_ALL_0); \
+
+#define MCFG_NVRAM_REPLACE_1FILL(_tag) \
+ MCFG_DEVICE_REPLACE(_tag, NVRAM, 0) \
+ nvram_device::static_set_default_value(*device, nvram_device::DEFAULT_ALL_1); \
+
+#define MCFG_NVRAM_REPLACE_RANDOM_FILL(_tag) \
+ MCFG_DEVICE_REPLACE(_tag, NVRAM, 0) \
+ nvram_device::static_set_default_value(*device, nvram_device::DEFAULT_RANDOM); \
+
+#define MCFG_NVRAM_REPLACE_CUSTOM_DRIVER(_tag, _class, _method) \
+ MCFG_DEVICE_REPLACE(_tag, NVRAM, 0) \
+ nvram_device::static_set_custom_handler(*device, nvram_init_delegate(&_class::_method, #_class "::" #_method, NULL, (_class *)0)); \
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class nvram_device;
+
+
+// custom initialization for default state
+typedef device_delegate<void (nvram_device &, void *, size_t)> nvram_init_delegate;
+
+
+// ======================> nvram_device
+
+class nvram_device : public device_t,
+ public device_nvram_interface
+{
+public:
+ // 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, UINT32 clock);
+
+ // inline configuration helpers
+ static void static_set_default_value(device_t &device, default_value value);
+ static void static_set_custom_handler(device_t &device, nvram_init_delegate callback);
+
+ // controls
+ void set_base(void *base, size_t length) { m_base = base; m_length = length; }
+
+protected:
+ // device-level overrides
+ virtual void device_start();
+
+ // device_nvram_interface overrides
+ virtual void nvram_default();
+ virtual void nvram_read(emu_file &file);
+ virtual void nvram_write(emu_file &file);
+
+ // internal helpers
+ void determine_final_base();
+
+ // configuration state
+ default_value m_default_value;
+ nvram_init_delegate m_custom_handler;
+
+ // runtime state
+ void * m_base;
+ size_t m_length;
+};
+
+
+// device type definition
+extern const device_type NVRAM;
+
+
+#endif