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# Copyright (c) 2013-2015 ARM Limited
# All rights reserved.
#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder. You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
#
# 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 of the copyright holders 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "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 THE COPYRIGHT
# OWNER OR CONTRIBUTORS 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.
#
# Authors: Rene de Jong
#
from m5.params import *
from m5.proxy import *
from AbstractNVM import *
#Distribution of the data.
#sequential: sequential (address n+1 is likely to be on the same plane as n)
#Random: @TODO Not yet implemented
#stripe: striping over all the planes
class DataDistribution(Enum): vals = ['sequential', 'stripe']
class FlashDevice(AbstractNVM):
type = 'FlashDevice'
cxx_header = "dev/arm/flash_device.hh"
# default blocksize is 128 kB.This seems to be the most common size in
# mobile devices (not the image blocksize)
blk_size = Param.MemorySize("128kB", "Size of one disk block")
# disk page size is 2 kB. This is the most commonly used page size in
# flash devices
page_size = Param.MemorySize("2kB", "Size of one disk page")
# There are many GC flavours. It is impossible to cover them all; this
# parameter enables the approximation of different GC algorithms
GC_active = Param.Percent(50, "Percentage of the time (in whole numbers) \
that the GC is activated if a block is full")
# Access latencies. Different devices will have different latencies, but
# the latencies will be around the default values.
read_lat = Param.Latency("25us", "Read Latency")
write_lat = Param.Latency("200us", "Write Latency")
erase_lat = Param.Latency("1500us", "Erase Delay")
# Number of planes ought to be a power of two according to ONFI standard
num_planes = Param.UInt32(1, "Number of planes per die")
# Data distribution. Default is none. It is adviced to switch to stripe
# when more than one plane is used.
data_distribution = Param.DataDistribution('sequential', "Distribution \
of the data in the adress table; Stripe needed for multiple\
planes; otherwise use: sequential")
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