#!/usr/bin/env python
"""
Generate core_selector.v and core_vfiles.mk for a set of cores.
"""
#=======================================================================
# Copyright (c) 2015-2017, NORDUnet A/S 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 of the NORDUnet 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
# HOLDER 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.
#=======================================================================
# The modexpa7 core drags in a one clock cycle delay to other cores,
# to compensate for the extra clock cycle consumed by the block
# memories used in the modexpa7 core. We probably want a general
# solution for this, because we're going to run into this problem for
# any core that handles arguments big enough to require block memory.
# To Do:
#
# - Consider automating the one-clock-cycle delay stuff by adding
# another boolean flag to the config file. Default would be no
# delay, if any included core sets the "I use block memories" flag,
# all other cores would get the delay. Slightly tedious but
# something we can calculate easily enough, and probably an
# improvement over wiring in the delay when nothing needs it.
def main():
"""
Parse arguments and config file, generate core list, generate output.
"""
from argparse import ArgumentParser, FileType, ArgumentDefaultsHelpFormatter
from sys import exit
parser = ArgumentParser(description = __doc__, formatter_class = ArgumentDefaultsHelpFormatter)
parser.add_argument("-d", "--debug", help = "enable debugging", action = "store_true")
parser.add_argument("-c", "--config", help = "configuration file", default = "core.cfg", type = FileType("r"))
parser.add_argument("-b", "--board", help = "config file 'board' section")
parser.add_argument("-p", "--project", help = "config file 'project' section")
parser.add_argument("-v", "--verilog", help = "verilog output file",default = "core_selector.v", type = FileType("w"))
parser.add_argument("-m", "--makefile",help = "output makefile", default = "core_vfiles.mk", type = FileType("w"))
parser.add_argument("core", help = "name(s) of core(s)", nargs = "*")
args = parser.parse_args()
try:
cfg = RawConfigParser()
cfg.readfp(args.config)
board = args.board or cfg.get("default", "board")
board_section = "board " + board
Core.bus_name = cfg.get(board_section, "bus name")
Core.bus_width = int(cfg.get(board_section, "bus width"))
Core.bus_max = Core.bus_width - 1
Core.addr_width = Core.bus_width - 8
Core.addr_max = Core.addr_width - 1
Core.extra_wires = cfg.get(board_section, "extra wires")
Core.modexp = cfg.get(board_section, "modexp")
if Core.extra_wires:
# restore formatting
Core.extra_wires = Core.extra_wires.replace("\n", "\n ") + "\n"
if args.core:
cores = args.core
else:
project = args.project or cfg.get("default", "project")
cores = cfg.get("project " + project, "cores").split()
for core in cfg.getvalues(board_section, "requires"):
try:
(c1, c2) = core.split("/")
if c1 not in cores and c2 not in cores:
cores.append(c2)
except ValueError:
if core not in cores:
cores.append(core)
cores.insert(0, "board_regs")
cores.insert(1, "comm_regs")
cores = tuple(Core(core) for core in cores)
for core in cores:
core.configure(cfg)
core_number = 0
for core in cores:
core_number = core.assign_core_number(core_number)
if False:
# For some reason, attempting to optimize out the delay
# code entirely results in a non-working bitstream. Don't
# know why, disabling the optimization works, so just do
# that for now.
Core.need_one_cycle_delay = any(core.block_memory for core in cores)
args.verilog.write(createModule_template.format(
core = cores[0],
addrs = "".join(core.createAddr() for core in cores),
insts = "".join(core.createInstance() for core in cores),
muxes = "".join(core.createMux() for core in cores) ))
args.makefile.write(listVfiles_template.format(
vfiles = "".join(core.listVfiles() for core in cores)))
except Exception, e:
if args.debug:
raise
exit(str(e))
try:
import ConfigParser as configparser
except ImportError:
import configparser
class RawConfigParser(configparser.RawConfigParser):
"""
RawConfigParser with a few extensions.
"""
def getboolean(self, section, option, default = False):
if self.has_option(section, option):
# RawConfigParser is an old-stle class, super() doesn't work, feh.
return configparser.RawConfigParser.getboolean(self, section, option)
else:
return default
def getvalues(self, section, option):
if self.has_option(section, option):
for value in self.get(section, option).split():
yield value
def get(self, section, option):
try:
return configparser.RawConfigParser.get(self, section, option)
except configparser.NoSectionError:
if section in ("core board_regs", "core comm_regs"):
return ""
else:
raise
except configparser.NoOptionError:
return ""
class Core(object):
"""
Data and methods for a generic core. We can use this directly for
most cores, a few are weird and require subclassing to override
particular methods.
"""
# Class variable tracking how many times a particular core has
# been instantiated. This controls instance numbering.
_instance_count = {}
# Class variable recording whether we need a one-cycle delay to
# compensate for block memories.
need_one_cycle_delay = True
def __init__(self, name):
if Core.modexp and name == "modexp":
name = Core.modexp
self.name = name
self.cfg_section = "core " + name
self.core_number = None
self.vfiles = []
self.error_wire = True
self.block_memory = False
self.instance_number = self._instance_count.get(name, 0)
self._instance_count[name] = self.instance_number + 1
self.subcores = []
self.blocks = 1
self.dummy = False
def assign_core_number(self, n):
self.core_number = n
for i, subcore in enumerate(self.subcores):
subcore.assign_core_number(n + i + 1)
return n + self.blocks
def configure(self, cfg):
if self.instance_number == 0:
self.vfiles.extend(cfg.getvalues(self.cfg_section, "vfiles"))
for required in cfg.getvalues(self.cfg_section, "requires"):
if required not in self._instance_count:
self.vfiles.extend(cfg.getvalues("core " + required, "vfiles"))
self.error_wire = cfg.getboolean(self.cfg_section, "error wire", self.error_wire)
self.block_memory = cfg.getboolean(self.cfg_section, "block memory", self.block_memory)
self.extra_ports = cfg.get(self.cfg_section, "extra ports")
if self.extra_ports:
self.extra_ports = self.extra_ports.replace("\n", "\n ") + "\n"
self.blocks = int(cfg.get(self.cfg_section, "core blocks") or 1)
self.block_max = self.blocks - 1
if self.blocks > 1:
try:
self.block_bits = {4:2, 8:3, 16:4}[self.blocks]
except KeyError:
raise ValueError, "In [{}]: unexpected value \"core blocks = {}\"".format(self.cfg_section, self.blocks)
self.block_bit_max = self.block_bits - 1
for subcore in cfg.getvalues(self.cfg_section, "subcores"):
self.subcores.append(SubCore(subcore, self))
if len(self.subcores) > self.blocks - 1:
raise ValueError, "In [{}]: number of subcores exceeds size of \"core blocks\"".format(self.cfg_section)
self.module_name = cfg.get(self.cfg_section, "module name") or self.name
self.dummy = cfg.get(self.cfg_section, "dummy")
if self.dummy:
self.dummy = self.dummy.replace("\n", "\n ") + "\n"
@property
def instance_name(self):
if self._instance_count[self.name] > 1:
return "{}_{}".format(self.name, self.instance_number)
else:
return self.name
@property
def upper_instance_name(self):
return self.instance_name.upper()
@property
def error_wire_decl(self):
return "\n wire error_{core.instance_name};".format(core = self) if self.error_wire else ""
@property
def error_port(self):
return ",\n .error(error_{core.instance_name})".format(core = self) if self.error_wire else ""
@property
def one_cycle_delay(self):
return one_cycle_delay_template.format(core = self) if self.need_one_cycle_delay and not self.block_memory else ""
@property
def mux_core_addr(self):
if self.blocks == 1 or self.subcores:
return "CORE_ADDR_{core.upper_instance_name}".format(core=self)
else:
return ",\n ".join("CORE_ADDR_{core.upper_instance_name} + {0}".format(i, core=self) for i in range(self.blocks))
@property
def mux_data_reg(self):
return "read_data_" + self.instance_name + ("_reg" if self.need_one_cycle_delay and not self.block_memory else "")
@property
def mux_error_reg(self):
return "error_" + self.instance_name if self.error_wire else "0"
def createInstance(self):
template = createInstance_template_dummy if self.dummy else createInstance_template_generic if self.blocks == 1 else createInstance_template_multi_block
return template.format(core = self)
def createAddr(self):
if self.dummy:
return ""
return createAddr_template.format(core = self) + "".join(subcore.createAddr() for subcore in self.subcores)
def createMux(self):
if self.dummy:
return ""
return createMux_template.format(core = self, core0 = self) + "".join(subcore.createMux() for subcore in self.subcores)
def listVfiles(self):
return "".join(" \\\n\t$(CORE_TREE)/" + vfile for vfile in self.vfiles)
class SubCore(Core):
""""
Override mux handling for TRNG's sub-cores.
"""
def __init__(self, name, parent):
super(SubCore, self).__init__(name)
self.parent = parent
def createMux(self):
return createMux_template.format(core = self, core0 = self.parent)
# Templates (format strings), here instead of inline in the functions
# that use them, both because some of these are shared between
# multiple functions and because it's easier to read these (and get
# the indentation right) when the're separate.
# Template used by .createAddr() methods.
createAddr_template = """\
localparam CORE_ADDR_{core.upper_instance_name:21s} = {core.addr_width}'h{core.core_number:02x};
"""
# Template used by Core.createInstance().
createInstance_template_generic = """\
//----------------------------------------------------------------
// {core.upper_instance_name}
//----------------------------------------------------------------
wire enable_{core.instance_name} = (addr_core_num == CORE_ADDR_{core.upper_instance_name});
wire [31: 0] read_data_{core.instance_name};{core.error_wire_decl}
{core.module_name} {core.instance_name}_inst
(
.clk(sys_clk),
.reset_n(sys_rst_n),
{core.extra_ports}
.cs(enable_{core.instance_name} & (sys_{core.bus_name}_rd | sys_{core.bus_name}_wr)),
.we(sys_{core.bus_name}_wr),
.address(addr_core_reg),
.write_data(sys_write_data),
.read_data(read_data_{core.instance_name}){core.error_port}
);
{core.one_cycle_delay}
"""
# Template used for multi-block cores (modexp and trng). This is different
# enough from the base template that it's easier to make this separate.
createInstance_template_multi_block = """\
//----------------------------------------------------------------
// {core.upper_instance_name}
//----------------------------------------------------------------
wire enable_{core.instance_name} = (addr_core_num >= CORE_ADDR_{core.upper_instance_name}) && (addr_core_num <= CORE_ADDR_{core.upper_instance_name} + {core.addr_width}'h{core.block_max:02x});
wire [31: 0] read_data_{core.instance_name};{core.error_wire_decl}
wire [{core.block_bit_max}:0] {core.instance_name}_prefix = addr_core_num[{core.block_bit_max}:0] - CORE_ADDR_{core.upper_instance_name};
{core.module_name} {core.instance_name}_inst
(
.clk(sys_clk),
.reset_n(sys_rst_n),
{core.extra_ports}
.cs(enable_{core.instance_name} & (sys_{core.bus_name}_rd | sys_{core.bus_name}_wr)),
.we(sys_{core.bus_name}_wr),
.address({{{core.instance_name}_prefix, addr_core_reg}}),
.write_data(sys_write_data),
.read_data(read_data_{core.instance_name}){core.error_port}
);
{core.one_cycle_delay}
"""
createInstance_template_dummy = """\
//----------------------------------------------------------------
// {core.upper_instance_name}
//----------------------------------------------------------------
{core.dummy}
"""
# Template for one-cycle delay code.
one_cycle_delay_template = """\
reg [31: 0] read_data_{core.instance_name}_reg;
always @(posedge sys_clk)
read_data_{core.instance_name}_reg <= read_data_{core.instance_name};
"""
# Template for .createMux() methods.
createMux_template = """\
{core.mux_core_addr}:
begin
sys_read_data_mux = {core0.mux_data_reg};
sys_error_mux = {core0.mux_error_reg};
end
"""
# Top-level (createModule) template.
createModule_template = """\
// NOTE: This file is generated; do not edit.
module core_selector
(
input wire sys_clk,
input wire sys_rst_n,
input wire [{core.bus_max}: 0] sys_{core.bus_name}_addr,
input wire sys_{core.bus_name}_wr,
input wire sys_{core.bus_name}_rd,
output wire [31: 0] sys_read_data,
input wire [31: 0] sys_write_data,
output wire sys_error,
{core.extra_wires}
input wire noise,
output wire [7 : 0] debug
);
//----------------------------------------------------------------
// Address Decoder
//----------------------------------------------------------------
// upper {core.addr_width} bits specify core being addressed
wire [{core.addr_max:>2}: 0] addr_core_num = sys_{core.bus_name}_addr[{core.bus_max}: 8];
// lower 8 bits specify register offset in core
wire [ 7: 0] addr_core_reg = sys_{core.bus_name}_addr[ 7: 0];
//----------------------------------------------------------------
// Core Address Table
//----------------------------------------------------------------
{addrs}
{insts}
//----------------------------------------------------------------
// Output (Read Data) Multiplexer
//----------------------------------------------------------------
reg [31: 0] sys_read_data_mux;
assign sys_read_data = sys_read_data_mux;
reg sys_error_mux;
assign sys_error = sys_error_mux;
always @*
case (addr_core_num)
{muxes}
default:
begin
sys_read_data_mux = {{32{{1'b0}}}};
sys_error_mux = 1;
end
endcase
endmodule
//======================================================================
// EOF core_selector.v
//======================================================================
"""
# Template for makefile snippet listing Verilog source files.
listVfiles_template = """\
# NOTE: This file is generated; do not edit by hand.
vfiles +={vfiles}
"""
# Run main program.
if __name__ == "__main__":
main()
