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/***************************************************************************
nvram.c
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.
***************************************************************************/
#include "emu.h"
#include "machine/nvram.h"
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
// device type definition
const device_type NVRAM = &device_creator<nvram_device>;
//-------------------------------------------------
// nvram_device - constructor
//-------------------------------------------------
nvram_device::nvram_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, NVRAM, "NVRAM", tag, owner, clock),
device_nvram_interface(mconfig, *this),
m_default_value(DEFAULT_ALL_1),
m_base(NULL),
m_length(0)
{
}
//-------------------------------------------------
// static_set_interface - configuration helper
// to set the interface
//-------------------------------------------------
void nvram_device::static_set_default_value(device_t &device, default_value value)
{
nvram_device &nvram = downcast<nvram_device &>(device);
nvram.m_default_value = value;
}
//-------------------------------------------------
// static_set_custom_handler - configuration
// helper to set a custom callback
//-------------------------------------------------
void nvram_device::static_set_custom_handler(device_t &device, nvram_init_delegate handler)
{
nvram_device &nvram = downcast<nvram_device &>(device);
nvram.m_default_value = DEFAULT_CUSTOM;
nvram.m_custom_handler = handler;
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void nvram_device::device_start()
{
// bind our handler
if (!m_custom_handler.isnull())
m_custom_handler = nvram_init_delegate(m_custom_handler, m_owner);
}
//-------------------------------------------------
// nvram_default - called to initialize NVRAM to
// its default state
//-------------------------------------------------
void nvram_device::nvram_default()
{
// make sure we have a valid base pointer
determine_final_base();
// region always wins
if (m_region != NULL)
{
memcpy(m_base, *m_region, m_length);
return;
}
// default values for other cases
switch (m_default_value)
{
// all-0's
case DEFAULT_ALL_0:
memset(m_base, 0, m_length);
break;
// all 1's
default:
case DEFAULT_ALL_1:
memset(m_base, 0xff, m_length);
break;
// random values
case DEFAULT_RANDOM:
{
UINT8 *nvram = reinterpret_cast<UINT8 *>(m_base);
for (int index = 0; index < m_length; index++)
nvram[index] = machine().rand();
break;
}
// custom handler
case DEFAULT_CUSTOM:
m_custom_handler(*this, m_base, m_length);
break;
// none - do nothing
case DEFAULT_NONE:
break;
}
}
//-------------------------------------------------
// nvram_read - called to read NVRAM from the
// .nv file
//-------------------------------------------------
void nvram_device::nvram_read(emu_file &file)
{
// make sure we have a valid base pointer
determine_final_base();
file.read(m_base, m_length);
}
//-------------------------------------------------
// nvram_write - called to write NVRAM to the
// .nv file
//-------------------------------------------------
void nvram_device::nvram_write(emu_file &file)
{
file.write(m_base, m_length);
}
//-------------------------------------------------
// determine_final_base - get the final base
// pointer by looking up the memory share, unless
// a pointer was provided to us
//-------------------------------------------------
void nvram_device::determine_final_base()
{
// find our shared pointer with the target RAM
if (m_base == NULL)
{
m_base = memory_get_shared(machine(), tag(), m_length);
if (m_base == NULL)
throw emu_fatalerror("NVRAM device '%s' has no corresponding AM_SHARE region", tag());
}
// if we are region-backed for the default, find it now and make sure it's the right size
if (m_region != NULL && m_region->bytes() != m_length)
throw emu_fatalerror("NVRAM device '%s' has a default region, but it should be 0x%X bytes", tag(), m_length);
}
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