fd7bcb7ecd
We currently use the traditional SI-like prefixes to represent binary multipliers in some contexts. This is ambiguous in many cases since they overload the meaning of the SI prefix. Here are some examples of commonly used in the industry: * Storage vendors define 1 MB as 10**6 bytes * Memory vendors define 1 MB as 2**20 bytes * Network equipment treats 1Mbit/s as 10**6 bits/s * Memory vendors define 1Mbit as 2**20 bits In practice, this means that a FLASH chip on a storage bus uses decimal prefixes, but that same flash chip on a memory bus uses binary prefixes. It would also be reasonable to assume that the contents of a 1Mbit FLASH chip would take 0.1s to transfer over a 10Mbit Ethernet link. That's however not the case due to different meanings of the prefix. The quantity 2MX is treated differently by gem5 depending on the unit X: * Physical quantities (s, Hz, V, A, J, K, C, F) use decimal prefixes. * Interconnect and NoC bandwidths (B/s) use binary prefixes. * Network bandwidths (bps) use decimal prefixes. * Memory sizes and storage sizes (B) use binary prefixes. Mitigate this ambiguity by consistently using the ISO/IEC/SI prefixes for binary multipliers for parameters and comments where appropriate. Change-Id: I797163c8690ae0092e00e371d75f5e7cebbcd1f5 Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39579 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
74 lines
3.4 KiB
Python
74 lines
3.4 KiB
Python
# Copyright (c) 2005-2008 The Regents of The University of Michigan
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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from m5.SimObject import *
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from m5.params import *
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from m5.proxy import *
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from os import getcwd
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class Process(SimObject):
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type = 'Process'
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cxx_header = "sim/process.hh"
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@cxxMethod
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def map(self, vaddr, paddr, size, cacheable=False):
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pass
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input = Param.String('cin', "filename for stdin")
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output = Param.String('cout', 'filename for stdout')
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errout = Param.String('cerr', 'filename for stderr')
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system = Param.System(Parent.any, "system process will run on")
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useArchPT = Param.Bool('false', 'maintain an in-memory version of the page\
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table in an architecture-specific format')
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kvmInSE = Param.Bool('false', 'initialize the process for KvmCPU in SE')
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maxStackSize = Param.MemorySize('64MiB', 'maximum size of the stack')
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uid = Param.Int(100, 'user id')
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euid = Param.Int(100, 'effective user id')
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gid = Param.Int(100, 'group id')
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egid = Param.Int(100, 'effective group id')
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pid = Param.Int(100, 'process id')
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ppid = Param.Int(0, 'parent process id')
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pgid = Param.Int(100, 'process group id')
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executable = Param.String('', "executable (overrides cmd[0] if set)")
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cmd = VectorParam.String("command line (executable plus arguments)")
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env = VectorParam.String([], "environment settings")
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cwd = Param.String(getcwd(), "current working directory")
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simpoint = Param.UInt64(0, 'simulation point at which to start simulation')
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drivers = VectorParam.EmulatedDriver([], 'Available emulated drivers')
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release = Param.String('5.1.0', "Linux kernel uname release")
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@classmethod
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def export_methods(cls, code):
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code('bool map(Addr vaddr, Addr paddr, int sz, bool cacheable=true);')
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class EmulatedDriver(SimObject):
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type = 'EmulatedDriver'
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cxx_header = "sim/emul_driver.hh"
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abstract = True
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filename = Param.String("device file name (under /dev)")
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