rubyx/lib/risc/padding.rb

# Helper functions to pad memory.
#
# Meory is always in lines, chunks of 8 words / 32 bytes
module Padding

  # objects only come in lengths of multiple of 8 words / 32 bytes
  # and there is a "hidden" 1 word that is used for debug/check memory corruption
  def self.padded( len )
    a = 32 * (1 + ((len + 3)/32).floor )
    #puts "#{a} for #{len}"
    a
  end

  def self.padded_words( words )
    padded(words*4) # 4 == word length, a constant waiting for a home
  end

  def self.padding_for( length )
    pad = padded(length) - length  # for header, type
    pad
  end
end