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#!/usr/bin/ruby -w
OPCODE_BITS = 12
UROM_BITS = 15
UIP_BITS_PER_OPCODE = UROM_BITS - OPCODE_BITS
$stdout.write(<<END)
OPCODE_BITS = #{OPCODE_BITS}
UROM_BITS = #{UROM_BITS}
UIP_BITS_PER_OPCODE = #{UIP_BITS_PER_OPCODE} (max #{(1<<UIP_BITS_PER_OPCODE)-1} uops (+1 eom) per inst)
END
$uroms = {consts: [0] * (1 << UROM_BITS)}
$urom_sizes = {consts: 16}
$insts = {}
$this_inst = nil
$this_uop = nil
$next_opcode = 0
$next_vector = (1 << OPCODE_BITS) - 1
system("rm -rf out; mkdir -p out")
def urom(name, *bits)
throw "non-unique bit names" unless bits == bits.uniq
throw "µrom with this name already defined" if $uroms.member?(name)
$uroms[name] = [0] * (1 << UROM_BITS)
$urom_sizes[name] = bits.size
proxy = Object.new
$stdout.write("\n\t#{name}:\n")
bitmap = {}
bits.each_with_index do | bit, idx |
if bits.size > 8
$stdout.write("\t\t#{idx >> 3}.#{idx & 0x7}\t#{bit}\n")
else
$stdout.write("\t\t#{idx}\t#{bit}\n")
end
bitmap[bit] = 1 << idx
proxy.define_singleton_method(bit) do
if $this_uop
$this_uop[name] |= 1 << idx
else
uop do
$this_uop[name] |= 1 << idx
end
end
end
end
proxy.instance_variable_set(:@bitmap, bitmap)
instance_variable_set("@#{name}", proxy)
end
def urom_alias(urom, name, *bits)
merged = 0
proxy = instance_variable_get("@#{urom}")
bitmap = proxy.instance_variable_get(:@bitmap)
throw "Name already in use" if bitmap.member?(name)
bits.each do | bit |
merged |= bitmap[bit]
end
bitmap[name] = merged
proxy.define_singleton_method(name) do
if $this_uop
$this_uop[urom] |= merged
else
uop { $this_uop[urom] |= merged }
end
end
proxy.instance_variable_set(:@bitmap, bitmap)
end
def inst(pattern, vector=false, &code)
throw "nested instruction" if $this_inst
throw "instruction with this pattern already defined" if $insts.member?(pattern)
throw "too many opcodes" if $next_opcode > $next_vector
$this_opnum = vector ? $next_vector : $next_opcode
$stdout.write("\t#{$this_opnum.to_s(16)}\t#{($this_opnum << UIP_BITS_PER_OPCODE).to_s(16)}\t#{pattern}\n")
$this_inst = []
code.call
if not vector
$eom ||= uip()
uop { @decode.clear; @control.set_uip; constaddr($insts["!bom"] << UIP_BITS_PER_OPCODE) }
end
$this_inst.each_with_index do | uop, idx |
uip = ($this_opnum << UIP_BITS_PER_OPCODE) + idx
uop.each do | urom, entry |
$uroms[urom][uip] = entry
end
end
$insts[pattern] = $this_opnum
$this_opnum = nil
$this_inst = nil
if vector
$next_vector -= 1
else
$next_opcode += 1
end
end
def vector(name, &code)
inst("!#{name}", true, &code)
end
def uop(&code)
throw "not in instruction" unless $this_inst
throw "nested uop" if $this_uop
throw "too many uops" if $this_inst.size >= (1 << UIP_BITS_PER_OPCODE)
$this_uop = {}
$uroms.each_key do | urom |
$this_uop[urom] = 0
end
code.call
$this_inst << $this_uop
$this_uop = nil
end
def const(value)
throw "Value out of range" if value < 0 or value > 0xffff
if $this_uop
$this_uop[:consts] = value
else
uop do
$this_uop[:consts] = value
end
end
end
def constaddr(value)
const(value)
@control.outaddr
end
def constdata(value)
const(value)
@control.outdata
end
def uip()
throw "not in instruction" unless $this_inst
return ($this_opnum << UIP_BITS_PER_OPCODE) + $this_inst.size
end
$stdout.write("Control wires:\n")
load "modules.rb"
$stdout.write("\nOpcodes:\n")
load "vectors.rb"
load "insts.rb"
$stdout.write("\nWriting µrom contents:\n")
$uroms.each do | urom, data |
$stdout.write("\t#{urom}...")
$stdout.flush
if $urom_sizes[urom] > 8
0.upto(($urom_sizes[urom] / 8.0).ceil - 1) do | bank |
$stdout.write(" #{bank}")
$stdout.flush
File.open("out/#{urom}.#{bank}.bin", "wb") do | fh |
data.each do | word |
fh.write(((word >> (8 * bank)) & 0xff).chr)
end
end
end
else
File.open("out/#{urom}.bin", "wb") do | fh |
data.each do | byte |
fh.write(byte.chr)
end
end
end
$stdout.write("\n")
end
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