Class: Origen::Registers::Reg

Inherits:
Object
  • Object
show all
Includes:
SubBlocks::Domains, SubBlocks::Path
Defined in:
lib/origen/registers/reg.rb

Overview

The register class can be used to represent not only h/ware resgisters, but really any entity which has an address and data component, such as a specific RAM location.
Any registers instantiated through Origen::Registers#add_reg are instances of this class.

All methods in BitCollection can also be called on a Reg object.

Constant Summary collapse

REG_LEVEL_ATTRIBUTES =

These attributes can be defined on a register at definition time and will get applied to all of its contained bits unless a specific bit has its own definition of the same attribute

{
  feature:  {},
  reset:    { aliases: [:res] },
  memory:   {},
  path:     { aliases: [:hdl_path] },
  abs_path: { aliases: [:absolute_path] },
  access:   {}
}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from SubBlocks::Domains

#domain, #domain_specified?, #domains

Methods included from SubBlocks::Path

#abs_path, #abs_path=, #path, #path=, #path_var

Constructor Details

#initialize(owner, address, size, name, options = {}) ⇒ Reg

Normally shouldn’t be called directly, instantiate through add_reg Upon initialization bits are stored as follows: An array of bit objects in position order, @bits corresponds to the bit as position r A Hash lookup table for quickly accessing bit objects by name



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# File 'lib/origen/registers/reg.rb', line 60

def initialize(owner, address, size, name, options = {}) # :nodoc:
  @owner = owner
  @address = address
  @size = size
  @bits = []
  @lookup = {}
  @name = name
  @init_as_writable = options.delete(:init_as_writable)
  @define_file = options.delete(:define_file)
  REG_LEVEL_ATTRIBUTES.each do |attribute, _meta|
    instance_variable_set("@#{attribute}", options.delete(attribute))
  end
  @description_from_api = {}
  description = options.delete(:description)
  if description
    @description_from_api[:_reg] = description.split(/\r?\n/)
  end
  @meta = default_reg_metadata.merge(options.delete(:meta) || {})

  # Initialize with unwritable bits that read back as zero, can override this
  # to make all writable by default by setting the :init_writable option to true
  @size.times do |n|
    @bits << Bit.new(self, n, writable: @init_as_writable, undefined: true)
  end

  add_bits_from_options(options)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object

All other Reg methods are delegated to BitCollection



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# File 'lib/origen/registers/reg.rb', line 1107

def method_missing(method, *args, &block) # :nodoc:
  if method.to_sym == :to_ary || method.to_sym == :to_hash
    nil
  elsif meta_data_method?(method)
    extract_meta_data(method, *args)
  else
    if BitCollection.instance_methods.include?(method)
      BitCollection.new(self, name, @bits).send(method, *args, &block)
    elsif has_bits?(method)
      bits(method)
    else
      super
    end
  end
end

Instance Attribute Details

#address(options = {}) ⇒ Object Also known as: addr

Returns the register address added to its current base_address value (if any).

Parameters:

  • options (Hash) (defaults to: {})

Options Hash (options):

  • :relative (Boolean) — default: false —

    Return the address without adding the base address (if present)



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# File 'lib/origen/registers/reg.rb', line 702

def address(options = {})
  options = {
    relative: false
  }.merge(options)
  address = @address
  domain_option = options[:domains] || options[:domain]
  @domain_option ||= domain_option unless frozen?
  # Blow the cache when the domain option changes
  @base_address_applied = nil unless @domain_option == domain_option
  unless @base_address_applied
    # Give highest priority to the original API which allowed the object
    # doing register read/write to define a base_address method
    if (writer && writer.methods.include?(:base_address) && writer.method(:base_address).arity != 0) ||
       (reader && reader.methods.include?(:base_address) && reader.method(:base_address).arity != 0)
      # This currently assumes that the base address is always the same
      # for reading and writing
      if writer && writer.respond_to?(:base_address) && writer.method(:base_address).arity != 0
        self.base_address = writer.base_address(self)
      elsif reader && reader.respond_to?(:base_address) && reader.method(:base_address).arity != 0
        self.base_address = reader.base_address(self)
      end
    else
      o = owner.is_a?(Container) ? owner.owner : owner
      d = domain_option || domains
      if o && o.reg_base_address(domain: d)
        self.base_address = o.reg_base_address(domain: d)
      end
    end
    @base_address_applied = true
  end
  unless options[:relative]
    address += base_address if base_address
  end
  if options[:address_type]
    Origen.deprecate 'Specifying the address_type of a register address will be removed from Origen 3'
    case options[:address_type]
      when :byte
        address = address * 2
      when :word
        address = address
      when :longword
        address = address / 2
      else
        fail 'Unknown address type requested!'
    end
  end
  address
end

#base_address ⇒ Object

The base address of the register, this will be set dynamically by Origen based on the parent’s base address



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# File 'lib/origen/registers/reg.rb', line 31

def base_address
  @base_address
end

#define_file ⇒ Object (readonly)

Returns a full path to the file in which the register was defined



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# File 'lib/origen/registers/reg.rb', line 43

def define_file
  @define_file
end

#feature ⇒ Object

Any feature associated with the register



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# File 'lib/origen/registers/reg.rb', line 38

def feature
  @feature
end

#grows_backwards ⇒ Object

:nodoc:



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# File 'lib/origen/registers/reg.rb', line 40

def grows_backwards
  @grows_backwards
end

#lookup ⇒ Object

:nodoc:



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# File 'lib/origen/registers/reg.rb', line 41

def lookup
  @lookup
end

#memory ⇒ Object

If the given register’s reset data is backed by memory, the memory address can be recorded in this attribute



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# File 'lib/origen/registers/reg.rb', line 50

def memory
  @memory
end

#meta ⇒ Object Also known as: meta_data, metadata

Returns any application-specific meta-data attatched to the given register



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# File 'lib/origen/registers/reg.rb', line 45

def meta
  @meta
end

#name ⇒ Object

The register name



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# File 'lib/origen/registers/reg.rb', line 36

def name
  @name
end

#owner ⇒ Object (readonly) Also known as: parent

Returns the object that own the register.

Example

$soc.reg(:blah).owner   # Returns the $soc object



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# File 'lib/origen/registers/reg.rb', line 27

def owner
  @owner
end

#size ⇒ Object (readonly)

Returns an integer representing the number of bits in the register



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# File 'lib/origen/registers/reg.rb', line 34

def size
  @size
end

Class Method Details

.clean_value(value) ⇒ Object

Cleans an input value, in some cases it could be a register object, or an explicit value. This will return an explicit value in either case.



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# File 'lib/origen/registers/reg.rb', line 1217

def self.clean_value(value) # :nodoc:
  value = value.val if value.respond_to?('val')  # Pull out the data value if a reg object has been passed in
  value
end

.dummy(size = 16) ⇒ Object

Returns a dummy register object that can be used on the fly, this can sometimes be useful to configure an intricate read operation.

Example

# Read bit 5 of RAM address 0xFFFF1280
dummy = Reg.dummy           # Create a dummy reg to configure the read operation
dummy.address = 0xFFFF1280  # Set the address
dummy.bit(5).read!(1)       # Read bit 5 expecting a 1



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# File 'lib/origen/registers/reg.rb', line 469

def self.dummy(size = 16)
  Reg.new(self, 0, size, :dummy, init_as_writable: true)
end

Instance Method Details

#&(val) ⇒ Object

Returns the BITWISE AND of reg with another reg or a number, the state of both registers remains unchanged

Example

reg(:data).write(0x5555)
reg(:data2).write(0xFFFF)
reg(:data) & 0xFF00         # => 0x5500
reg(:data) & reg(:data2)    # => 0x5555



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# File 'lib/origen/registers/reg.rb', line 1181

def &(val)
  data & Reg.clean_value(val)
end

#*(val) ⇒ Object

Returns the PRODUCT of reg with another reg or a number, the state of both registers remains unchanged



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# File 'lib/origen/registers/reg.rb', line 1211

def *(val)
  data * Reg.clean_value(val)
end

#+(val) ⇒ Object

Returns the SUM of reg with another reg or a number, the state of both registers remains unchanged



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# File 'lib/origen/registers/reg.rb', line 1193

def +(val)
  data + Reg.clean_value(val)
end

#-(val) ⇒ Object

Returns the SUBTRACTION of reg with another reg or a number, the state of both registers remains unchanged



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# File 'lib/origen/registers/reg.rb', line 1199

def -(val)
  data - Reg.clean_value(val)
end

#/(val) ⇒ Object

Returns the DIVISION of reg with another reg or a number, the state of both registers remains unchanged



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# File 'lib/origen/registers/reg.rb', line 1205

def /(val)
  data / Reg.clean_value(val)
end

#add_bit(id, position, options = {}) ⇒ Object

Add a bit to the register, should only be called internally



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# File 'lib/origen/registers/reg.rb', line 825

def add_bit(id, position, options = {}) # :nodoc:
  options = { data: @bits[position].data,  # If undefined preserve any data/reset value that has
              res:  @bits[position].data,   # already been applied at reg level
            }.merge(options)

  @lookup[id] = { pos: position, bits: 1, feature: options[:feature] }
  @bits.delete_at(position)    # Remove the initial bit from this position

  @bits.insert(position, Bit.new(self, position, options))
  self
end

#add_bits_from_options(options = {}) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/origen/registers/reg.rb', line 409

def add_bits_from_options(options = {}) # :nodoc:
  # edit Traynor
  # options is now an array for split bit groups or a hash if single bit/range bits
  # Now add the requested bits to the register, removing the unwritable bits as required
  options.each do |bit_id, bit_params|
    if bit_params.is_a? Hash
      description = bit_params.delete(:description)
      if description
        @description_from_api[bit_id] = description.split(/\r?\n/)
      end
      bind(bit_id, bit_params.delete(:bind)) if bit_params[:bind]
      position = bit_params[:pos] || 0
      num_bits = bit_params[:bits] || 1
      if @reset
        if @reset.is_a?(Symbol)
          bit_params[:res] = @reset
        else
          bit_params[:res] = @reset[(num_bits + position - 1), position]
        end
      end
      bit_params[:access] = @access if bit_params[:access].nil?
      bit_params[:res] = bit_params[:data] if bit_params[:data]
      bit_params[:res] = bit_params[:reset] if bit_params[:reset]
      if num_bits == 1
        add_bit(bit_id, position, bit_params)   # and add the new one
      else
        add_bus(bit_id, position, num_bits, bit_params)
      end
    elsif bit_params.is_a? Array

      description = bit_params.map { |h| h.delete(:description) }.compact.join("\n")
      unless description.empty?
        @description_from_api[bit_id] = description.split(/\r?\n/)
      end
      add_bus_scramble(bit_id, bit_params)
    end
  end
  self
end

#add_bus(id, position, size, options = {}) ⇒ Object

Add a bus to the register, should only be called internally



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# File 'lib/origen/registers/reg.rb', line 838

def add_bus(id, position, size, options = {}) # :nodoc:
  default_data = 0
  size.times do |n|
    default_data |= @bits[position + n].data << n
  end
  options = { data: default_data,  # If undefined preserve any data/reset value that has
              res:  default_data,   # already been applied at reg level
            }.merge(options)

  @lookup[id] = { pos: position, bits: size }
  size.times do |n|
    bit_options = options.dup
    bit_options[:data] = options[:data][n]
    if options[:res].is_a?(Symbol)
      bit_options[:res]  = options[:res]
    else
      bit_options[:res]  = options[:res][n]
    end
    @bits.delete_at(position + n)
    @bits.insert(position + n, Bit.new(self, position + n, bit_options))
  end
  self
end

#add_bus_scramble(id, array_of_hashes = []) ⇒ Object 



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# File 'lib/origen/registers/reg.rb', line 862

def add_bus_scramble(id, array_of_hashes = [])
  array_of_hashes.each do |options|
    bind(id, options.delete(:bind)) if options[:bind]
    position = options[:pos] || 0
    num_bits = options[:bits] || 1
    size = options[:bits]
    options[:data] = options[:data] if options[:data]
    options[:res] = options[:reset] if options[:reset]
    default_data = 0
    size.times do |n|
      default_data |= @bits[position + n].data << n
    end
    options = { data: default_data,  # If undefined preserve any data/reset value that has
                res:  default_data,   # already been applied at reg level
              }.merge(options)

    @lookup[id] = [] if @lookup[id].nil?
    @lookup[id] = @lookup[id].push(pos: position, bits: size)
    size.times do |n|
      bit_options = options.dup
      bit_options[:data] = options[:data][n]
      bit_options[:res]  = options[:res][n]
      @bits.delete_at(position + n)
      @bits.insert(position + n, Bit.new(self, position + n, bit_options))
    end
    self
  end
end

#bind(bitname, live_parameter) ⇒ Object 



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# File 'lib/origen/registers/reg.rb', line 96

def bind(bitname, live_parameter)
  unless live_parameter.respond_to?(:is_a_live_parameter?) && live_parameter.is_a_live_parameter?
    fail 'Only live updating parameters should be bound, make sure you have not missed .live in the path to the parameter!'
  end
  @parameter_bound_bits ||= {}
  @parameter_bound_bits[bitname] = live_parameter
end

#bit(*args) ⇒ Object Also known as: bits, []

Returns the bit object(s) responding to the given name, wrapped in a BitCollection. This method also accepts multiple name possibilities, if neither bit exists in the register it will raise an error, otherwise it will return the first match. If no args passed in, it will return a BitCollection containing all bits. If a number is passed in then the bits from those positions are returned.

Example

add_reg :control, 0x55, :status => {:pos => 1, :bits => 2},
                        :fail   => {:pos => 0}

reg(:control).bit(:fail)              # => Returns a BitCollection containing the fail bit
reg(:control).bits(:status)           # => Returns a BifCollection containing the status bits
reg(:control).bit(:bist_fail, :fail)  # => Returns a BitCollection containing the fail bit
reg(:control).bit(0)                  # => Returns a BitCollection containing the fail bit
reg(:control).bit(1)                  # => Returns a BitCollection containing status bit
reg(:control).bit(1,2)                # => Returns a BitCollection containing both status bits



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# File 'lib/origen/registers/reg.rb', line 929

def bit(*args)
  # return get_bits_with_constraint(nil,:default) if args.size == 0
  constraint = extract_feature_params(args)
  if constraint.nil?
    constraint = :default
  end
  collection = BitCollection.new(self, :unknown)
  if args.size == 0
    collection.add_name(name)
    @bits.each do |bit|
      collection << get_bits_with_constraint(bit.position, constraint)
    end
  else
    args.flatten!
    args.sort!
    args.each do |arg_item|
      if arg_item.is_a?(Fixnum)
        b = get_bits_with_constraint(arg_item, constraint)
        collection << b if b
      elsif arg_item.is_a?(Range)
        expand_range(arg_item) do |bit_number|
          collection << get_bits_with_constraint(bit_number, constraint)
        end
      else
        # Reaches here if bit name is specified

        if @lookup.include?(arg_item)
          split_bits = false
          @lookup.each { |_k, v| split_bits = true if v.is_a? Array }
          coll = get_lookup_feature_bits(arg_item, constraint, split_bits)
          if coll
            coll.each do |b|
              collection.add_name(arg_item)
              collection << b
            end
          end
        end
      end
    end
  end
  if collection.size == 0
    # Originally Origen returned nil when asking for a bit via an index which does not
    # exist, e.g. reg[1000] => nil
    # The args numeric clause here is to maintain that behavior
    if Origen.config.strict_errors && !args.all? { |arg| arg.is_a?(Numeric) }
      puts "Register #{@name} does not have a bits(s) named :#{args.join(', :')} or it might not be enabled."
      puts 'This could also be a typo, these are the valid bit names:'
      puts @lookup.keys
      fail 'Missing bits error!'
    end
    nil
  else
    collection
  end
end

#bit_value_descriptions(bitname, options = {}) ⇒ Object 



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# File 'lib/origen/registers/reg.rb', line 293

def bit_value_descriptions(bitname, options = {})
  options = {
    format: :binary
  }.merge(options)
  base = case options[:format]
         when :bin, :binary
           2
         when :hex, :hexadecimal
           16
         when :dec, :decimal
           10
         else
           fail "Unknown integer format: #{options[:format]}"
         end
  desc = {}
  description(bitname).each do |line|
    if line =~ /^\s*(\d+)\s+\|\s+(.+)/
      desc[Regexp.last_match[1].to_i(base)] = Regexp.last_match[2]
    end
  end
  desc
end

#contains_bits? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 404

def contains_bits?
  true
end

#copy(reg) ⇒ Object

Copies data and overlays from one reg object to another, it does not copy read or store flags



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# File 'lib/origen/registers/reg.rb', line 1165

def copy(reg)
  size.times do |i|
    source_bit = reg.bit[i]
    @bits[i].overlay(source_bit.overlay_str) if source_bit.has_overlay?
    @bits[i].write(source_bit.data)
  end
  self
end

#copy_data_from(reg) ⇒ Object

Copies data from one reg object to another

Example

reg(:data_copy).data                # => 0
reg(:data).write(0x1234)
reg(:data_copy).copy_data_from(reg(:data))
reg(:data_copy).data                # => 0x1234



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# File 'lib/origen/registers/reg.rb', line 1156

def copy_data_from(reg)
  size.times do |i|
    @bits[i].write(reg.bit[i].data)
  end
  self
end

#copy_overlays_from(reg, options = {}) ⇒ Object

Copy overlays from one reg object to another

Example

reg(:data_copy).has_overlay?        # => false
reg(:data).overlay("data_val")
reg(:data_copy).copy_overlays_from(reg(:data))
reg(:data_copy).has_overlay?        # => true



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# File 'lib/origen/registers/reg.rb', line 1136

def copy_overlays_from(reg, options = {})
  size.times do |i|
    source_bit = reg.bit[i]
    if source_bit.has_overlay?
      ov = source_bit.overlay_str
      # If an id has been supplied make sure any trailing ID in the source is
      # changed to supplied identifier
      ov.gsub!(/_\d$/, "_#{options[:update_id]}") if options[:update_id]
      @bits[i].overlay(ov)
    end
  end
  self
end

#default_reg_metadata ⇒ Object

Returns any application specific metadata that has been inherited by the given register. This does not account for any overridding that may have been applied to this register specifically however, use the meta method to get that.



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# File 'lib/origen/registers/reg.rb', line 288

def default_reg_metadata
  Origen::Registers.default_reg_metadata.merge(
    Origen::Registers.reg_metadata[owner.class] || {})
end

#delete_bit(collection) ⇒ Object Also known as: delete_bits

Delete the bits in the collection from the register



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# File 'lib/origen/registers/reg.rb', line 892

def delete_bit(collection)
  [collection.name].flatten.each do |name|
    @lookup.delete(name)
  end
  collection.each do |bit|
    @bits.delete_at(bit.position)    # Remove the bit
    @bits.insert(bit.position, Bit.new(self, bit.position, writable: @init_as_writable))
  end
  self
end

#description(bitname = :_reg, options = {}) ⇒ Object Also known as: descriptions

Returns the description of this register if any, if none then an empty array will be returned

Note Adding a description field will override any comment-driven documentation of a register (ie markdown style comments)



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# File 'lib/origen/registers/reg.rb', line 346

def description(bitname = :_reg, options = {})
  bitname, options = :_reg, bitname if bitname.is_a?(Hash)
  options = {
    include_name:       true,
    include_bit_values: true
  }.merge(options)
  if @description_from_api[bitname]
    desc = @description_from_api[bitname]
  else
    parse_descriptions unless description_lookup[define_file]
    begin
      desc = description_lookup[define_file][name][bitname] || []
    rescue
      desc = []
    end
  end
  desc = desc.reject do |line|
    if bitname != :_reg
      unless options[:include_bit_values]
        !!(line =~ /^\s*(\d+)\s+\|\s+(.+)/)
      end
    else
      false
    end
  end
  if desc.first
    unless options[:include_name]
      desc[0] = desc.first.sub(/\s*\*\*\s*#{escape_special_char(full_name(bitname))}\s*\*\*\s*-?\s*/, '')
    end
  end
  desc.shift if desc.first && desc.first.strip.empty?
  desc.pop if desc.last && desc.last.strip.empty?
  desc
end

#description_lookup ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a hash containing all register descriptions that have been parsed so far.



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# File 'lib/origen/registers/reg.rb', line 280

def description_lookup
  @@description_lookup ||= {}
end

#empty_bits(_options = {}) ⇒ Object

Returns an array of unoccupied bit positions

Example

reg :fstat, @base + 0x0000, :size => 8 do
  bit 7,  :ccif
  bit 6,  :rdcolerr
  bit 5,  :accerr
  bit 4,  :pviol
  bit 0,  :mgstat0
end
regs(:fstat).empty_bits
=> [1, 2, 3]

Example

reg :aguahb2, @base + 0x2A, :size => 8 do
  bit 5..2, :m0b_hbstrb, :reset => 0x0
  bit 1..0, :m0b_htrans, :reset => 0x2
end
regs(:aguahb2).empty_bits
=> [6, 7]



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# File 'lib/origen/registers/reg.rb', line 644

def empty_bits(_options = {})
  array_span = (0..(size - 1)).to_a
  empty_bits = array_span - used_bits
  empty_bits
end

#empty_bits?(_options = {}) ⇒ Boolean

Returns true if any named_bits exist, false if used_bits is an empty array

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 651

def empty_bits?(_options = {})
  empty_bits.size > 0
end

#enabled? ⇒ Boolean

Query the owner heirarchy to see if this register is enabled

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 1265

def enabled?
  if feature
    value = false
    current_owner = self
    if feature.class == Array
      feature.each do |f|
        current_owner = self
        loop do
          if current_owner.respond_to?(:owner)
            current_owner = current_owner.owner
            if current_owner.respond_to?(:has_feature?)
              if current_owner.has_feature?(f)
                value = true
                break
              end
            end
          else # if current owner does not have a owner
            value = false
            break
          end
        end # loop end
        unless value
          if Origen.top_level && \
             Origen.top_level.respond_to?(:has_feature?) && \
             Origen.top_level.has_feature?(f)
            value = true
            unless value
              break
            end
          end
        end
        unless value
          break # break if feature not found and return false
        end
      end # iterated through all features in array
      return value
    else # if feature.class != Array
      loop do
        if current_owner.respond_to?(:owner)
          current_owner = current_owner.owner
          if current_owner.respond_to?(:has_feature?)
            if current_owner.has_feature?(feature)
              value = true
              break
            end
          end
        else # if current owner does not have a owner
          value = false
          break
        end
      end # loop end
      unless value
        if Origen.top_level && \
           Origen.top_level.respond_to?(:has_feature?) && \
           Origen.top_level.has_feature?(feature)
          value = true
        end
      end
      return value
    end
  else
    return true
  end
end

#enabled_by_feature?(name = nil) ⇒ Boolean Also known as: has_feature_constraint?

Returns true if the register is constrained by the given/any feature

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 1246

def enabled_by_feature?(name = nil)
  if !name
    !!feature
  else
    if feature.class == Array
      feature.each do |f|
        if f == name
          return true
        end
      end
      return false
    else
      return feature == name
    end
  end
end

#escape_special_char(str) ⇒ Object

Escapes brackets and parenthesis. Helper for description method.



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# File 'lib/origen/registers/reg.rb', line 337

def escape_special_char(str)
  str.gsub('[', '\[').gsub(']', '\]').gsub('(', '\(').gsub(')', '\)') if str
end

#expand_range(range) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/origen/registers/reg.rb', line 905

def expand_range(range)
  if range.first > range.last
    range = Range.new(range.last, range.first)
  end
  range.each do |i|
    yield i
  end
end

#extract_feature_params(args) ⇒ Object 



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# File 'lib/origen/registers/reg.rb', line 1091

def extract_feature_params(args)
  index = args.find_index { |arg| arg.class == Hash }
  if index
    params = args.delete_at(index)
  else
    params = nil
  end

  if params
    return params[:enabled_features] || params[:enabled_feature]
  else
    return nil
  end
end

#extract_meta_data(method, *args) ⇒ Object 



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# File 'lib/origen/registers/reg.rb', line 1236

def extract_meta_data(method, *args)
  method = method.to_s.sub('?', '')
  if method =~ /=/
    instance_variable_set("@#{method.sub('=', '')}", args.first)
  else
    instance_variable_get("@#{method}") || meta[method.to_sym]
  end
end

#freeze ⇒ Object 



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# File 'lib/origen/registers/reg.rb', line 88

def freeze
  bits.each(&:freeze)
  # Call any methods which cache results to generate the instance variables
  # before they are frozen
  address
  super
end

#full_name(bitname = :_reg, _options = {}) ⇒ Object

Returns the full name of the register when this has been specified in the register description like this:

# ** This is the Register Full Name **
# This register blah blah

This method will also be called by bit collections to look up the name when defined in a similar manner in the bit description.

If no name has been specified this will return nil.



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# File 'lib/origen/registers/reg.rb', line 326

def full_name(bitname = :_reg, _options = {})
  bitname, options = :_reg, bitname if bitname.is_a?(Hash)
  desc = description(bitname).first
  # Capture something like this:
  # ** This is the full name ** - This bit blah blah
  if desc && desc =~ /\s*\*\*\s*([^\*.]*)\s*\*\*/
    Regexp.last_match[1].strip
  end
end

#get_bits_with_constraint(number, params) ⇒ Object 



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# File 'lib/origen/registers/reg.rb', line 987

def get_bits_with_constraint(number, params)
  return nil unless @bits[number]
  if (params == :default || !params) && @bits[number].enabled?
    @bits[number]
  elsif params == :none && !@bits[number].has_feature_constraint?
    @bits[number]
  elsif params == :all
    @bits[number]
  elsif params.class == Array
    params.each do |param|
      unless @bits[number].enabled_by_feature?(param)
        return nil
      end
      @bits[number]
    end
  elsif @bits[number].enabled_by_feature?(params)
    @bits[number]
  else
    return Bit.new(self, number, writable: false)
  end
end

#get_lookup_feature_bits(bit_name, params, split_group_reg) ⇒ Object 



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# File 'lib/origen/registers/reg.rb', line 1009

def get_lookup_feature_bits(bit_name, params, split_group_reg)
  ##
  if split_group_reg == false # if this register has single bits and continuous ranges

    if @lookup.include?(bit_name)
      collection = BitCollection.new(self, bit_name)
      (@lookup[bit_name][:bits]).times do |i|
        collection << @bits[@lookup[bit_name][:pos] + i]
      end
      if !params || params == :default
        if collection.enabled?
          return collection
        end
      elsif params == :none
        unless collection.has_feature_constraint?
          return collection
        end
      elsif params == :all
        return collection
      elsif params.class == Array
        if params.all? { |param| collection.enabled_by_feature?(param) }
          return collection
        end
      else
        if collection.enabled_by_feature?(params)
          return collection
        end
      end
      return BitCollection.dummy(self, bit_name, size: collection.size, pos: @lookup[bit_name][:pos])
    else
      return []
    end

  elsif split_group_reg == true # if this registers has split bits in its range
    if @lookup.is_a?(Hash) # && @lookup.include?(bit_name)
      collection = false
      @lookup.each do |k, v|  # k is the bitname, v is the hash of bit data
        if k == bit_name
          collection ||= BitCollection.new(self, k)
          if v.is_a?(Array)
            v.reverse_each do |pb|  # loop each piece of bit group data
              (pb[:bits]).times do |i|
                collection << @bits[pb[:pos] + i]
              end
            end
          else
            (v[:bits]).times do |i|
              collection << @bits[v[:pos] + i]
            end
          end
        end
      end
      if !params || params == :default
        if collection.enabled?
          return collection
        end
      elsif params == :none
        unless collection.has_feature_constraint?
          return collection
        end
      elsif params == :all
        return collection
      elsif params.class == Array
        if params.all? { |param| collection.enabled_by_feature?(param) }
          return collection
        end
      else
        if collection.enabled_by_feature?(params)
          return collection
        end
      end
      if @lookup.is_a?(Hash) && @lookup[bit_name].is_a?(Array)
        return BitCollection.dummy(self, bit_name, size: collection.size, pos: @lookup[bit_name][0][:pos])
      else
        return BitCollection.dummy(self, bit_name, size: collection.size, pos: @lookup[bit_name[:pos]])
      end
    else
      return []
    end
  end
end

#has_bit?(name) ⇒ Boolean Also known as: has_bits?, has_bit, has_bits

Returns true if the register contains a bit(s) matching the given name

Example

add_reg :control, 0x55, :status => {:pos => 1}

reg(:control).has_bit?(:result)     # => false
reg(:control).has_bit?(:status)     # => true

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 817

def has_bit?(name)
  @lookup.include?(name)
end

#has_bits_enabled_by_feature?(name = nil) ⇒ Boolean

Returns true if any of the bits within this register has feature associated with it.

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 1332

def has_bits_enabled_by_feature?(name = nil)
  if !name
    bits.any?(&:has_feature_constraint?)
  else
    bits.any? { |bit| bit.enabled_by_feature?(name) }
  end
end

#has_parameter_bound_bits? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 104

def has_parameter_bound_bits?
  @parameter_bound_bits && !@parameter_bound_bits.empty?
end

#initialize_copy(orig) ⇒ Object

This method is called whenever reg.clone is called to make a copy of a given register. Ruby will correctly copy all instance variables but it will not drill down to copy nested attributes, like the bits contained in @bits. This function will therefore correctly clone all bits contained in the register also.



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# File 'lib/origen/registers/reg.rb', line 453

def initialize_copy(orig) # :nodoc:
  @bits = []
  orig.bits.each do |bit|
    @bits << bit.clone
  end
  @lookup = orig.lookup.clone
  self
end

#inspect ⇒ Object 



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# File 'lib/origen/registers/reg.rb', line 120

def inspect
  bit_width = 13
  desc = ["\n0x%X - :#{name}" % address]
  desc << '  ' + ('=' * (bit_width + 1) * 8)

  # "<#{self.class}: #{self.name}>"
  (size / 8).times do |byte_index|
    # Need to add support for little endian regs here?
    byte_number = (size / 8) - byte_index
    max_bit = size - (byte_index * 8) - 1
    min_bit = max_bit - 8 + 1

    line = '  '
    # BIT INDEX ROW
    8.times do |i|
      line << '|' + "#{size - i - 1 - (byte_index * 8)}".center(bit_width)
    end
    line += '|'
    desc << line

    # BIT NAME ROW
    line = '  '
    named_bits include_spacers: true do |name, bit, bitcounter|
      if _bit_in_range?(bit, max_bit, min_bit)
        if bit.size > 1

          if name
            if bitcounter.nil?
              bit_name = "#{name}[#{_max_bit_in_range(bit, max_bit, min_bit)}:#{_min_bit_in_range(bit, max_bit, min_bit)}]"
              bit_span = _num_bits_in_range(bit, max_bit, min_bit)

            else
              upper = _max_bit_in_range(bit, max_bit, min_bit) + bitcounter - bit.size
              lower = _min_bit_in_range(bit, max_bit, min_bit) + bitcounter - bit.size
              bit_name = "#{name}[#{upper}:#{lower}]"
              bit_span = upper - lower + 1
            end
            width = bit_width * bit_span
            line << '|' + ":#{bit_name[0..width - 2]}".center(width + bit_span - 1)

          else
            bit.shift_out_left do |bit|
              if _index_in_range?(bit.position, max_bit, min_bit)
                line << '|' + ''.center(bit_width)
              end
            end
          end

        else
          bit_name = "#{name}"
          line << '|' + ":#{bit_name[0..bit_width - 2]}".center(bit_width)
        end
      end
    end
    line += '|'
    desc << line

    ## BIT ACCESS ROW
    # line = "Access "
    # self.named_bits :include_spacers => true do |name, bit|
    #  if _bit_in_range?(bit, max_bit, min_bit)
    #    if bit.size > 1
    #      if name
    #        access = _bit_rw(bit)
    #        bit_span = _num_bits_in_range(bit, max_bit, min_bit)
    #        width = bit_width * bit_span
    #        line << "|" + access.center(width + bit_span - 1)
    #      else
    #        bit.shift_out_left do |bit|
    #          if _index_in_range?(bit.position, max_bit, min_bit)
    #            line << "|" +  "".center(bit_width)
    #          end
    #        end
    #      end
    #    else
    #      access = _bit_rw(bit)
    #      line << "|" + access.center(bit_width)
    #    end
    #  end
    # end
    # line += "|"
    # desc << line

    ## BIT RESET ROW
    # line = "Reset  "
    # self.named_bits :include_spacers => true do |name, bit|
    #  if _bit_in_range?(bit, max_bit, min_bit)
    #    if bit.size > 1
    #      if name
    #        value = "0x%X" % bit.reset_val[_max_bit_in_range(bit, max_bit, min_bit).._min_bit_in_range(bit, max_bit, min_bit)]
    #        bit_span = _num_bits_in_range(bit, max_bit, min_bit)
    #        width = bit_width * bit_span
    #        line << "|" + value.center(width + bit_span - 1)
    #      else
    #        bit.shift_out_left do |bit|
    #          if _index_in_range?(bit.position, max_bit, min_bit)
    #             line << "|" +  "".center(bit_width)
    #          end
    #        end
    #      end
    #    else
    #      line << "|" + "#{bit.reset_val}".center(bit_width)
    #    end
    #  end
    # end
    # line += "|"
    # desc << line

    # BIT STATE ROW
    line = '  '
    named_bits include_spacers: true do |name, bit, _bitcounter|
      if _bit_in_range?(bit, max_bit, min_bit)
        if bit.size > 1
          if name
            if bit.has_known_value?
              value = '0x%X' % bit.val[_max_bit_in_range(bit, max_bit, min_bit).._min_bit_in_range(bit, max_bit, min_bit)]
            else
              if bit.reset_val == :undefined
                value = 'X'
              else
                value = 'M'
              end
            end
            value += _state_desc(bit)
            bit_span = _num_bits_in_range(bit, max_bit, min_bit)
            width = bit_width * bit_span
            line << '|' + value.center(width + bit_span - 1)
          else
            bit.shift_out_left do |bit|
              if _index_in_range?(bit.position, max_bit, min_bit)
                line << '|' + ''.center(bit_width)
              end
            end
          end
        else
          if bit.has_known_value?
            val = bit.val
          else
            if bit.reset_val == :undefined
              val = 'X'
            else
              val = 'M'
            end
          end
          value = "#{val}" + _state_desc(bit)
          line << '|' + value.center(bit_width)
        end
      end
    end
    line += '|'
    desc << line

    desc << '  ' + ('-' * (bit_width + 1) * 8)
  end
  desc.join("\n")
end

#lookup_operation_handler(operation) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/origen/registers/reg.rb', line 679

def lookup_operation_handler(operation)
  # Could have made the controller be the owner when assigned above, but may have run
  # into problems with the reg meta data stuff
  reg_owner = owner.respond_to?(:controller) && owner.controller ? owner.controller : owner
  if reg_owner.respond_to?(operation)
    reg_owner
  elsif reg_owner.respond_to?(:owner) && reg_owner.owner.respond_to?(operation)
    reg_owner.owner
  elsif Origen.top_level && Origen.top_level.respond_to?(operation)
    Origen.top_level
  end
end

#meta_data_method?(method) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 1223

def meta_data_method?(method)
  attr_name = method.to_s.gsub(/\??=?/, '').to_sym
  if default_reg_metadata.key?(attr_name)
    if method.to_s =~ /\?/
      [true, false].include?(default_reg_metadata[attr_name])
    else
      true
    end
  else
    false
  end
end

#named_bits(options = {}) ⇒ Object

Returns each named bit collection contained in the register,



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# File 'lib/origen/registers/reg.rb', line 474

def named_bits(options = {})
  options = {
    include_spacers: false
  }.merge(options)

  # test if @lookup has any values stored as an array
  # if so it means there is a split group of bits
  # process that differently to a single bit or continuous range of bits
  # which are typically stored in a hash

  split_bits = false
  @lookup.each { |_k, v| split_bits = true if v.is_a? Array }

  if split_bits == false
    current_pos = size
    # Sort by position descending
    @lookup.sort_by { |_name, details| -details[:pos] }.each do |name, details|
      pos = details[:bits] + details[:pos]
      if options[:include_spacers] && (pos != current_pos)
        collection = BitCollection.dummy(self, nil, size: current_pos - pos, pos: pos)
        yield nil, collection
      end
      collection = BitCollection.new(self, name)
      details[:bits].times do |i|
        collection << @bits[details[:pos] + i]
      end
      yield name, collection
      current_pos = details[:pos]
    end
    if options[:include_spacers] && current_pos != 0
      collection = BitCollection.dummy(self, nil, size: current_pos, pos: 0)
      yield nil, collection
    end
  elsif split_bits == true # if there are split bits, need to convert all regsiter bit values to array elements to allow sorting

    # if the register has bits split up across it, then store the bits in order of decreasing reg position
    # but first, stuff all the bits in a simple array, as single bits, or ranges of bits

    @lookup_splits = []
    @lookup.each do |k, v|
      tempbit = {}
      bitcounter = {}
      if v.is_a? Hash
        # then this is already a single bit or a continuous range so just stuff it into the array
        tempbit[k] = v
        @lookup_splits << tempbit.clone
      elsif v.is_a? Array
        # if the bitgroup is split, then decompose into single bits and continuous ranges
        v.each_with_index do |bitdetail, _i|
          if bitcounter.key?(k)
            bitcounter[k] = bitcounter[k] + bitdetail[:bits]
          else
            bitcounter[k] = bitdetail[:bits]
          end
          tempbit[k] = bitdetail
          @lookup_splits << tempbit.clone
        end
      end
      if v.is_a? Array
        @lookup_splits.each_with_index do |_e, q|
          groupname = @lookup_splits[q].to_a[0][0]
          if groupname == k
            @lookup_splits[q][groupname][:bitgrouppos] = bitcounter[groupname] if groupname == k
            bitcounter[groupname] = bitcounter[groupname] - @lookup_splits[q][groupname][:bits]
          end
        end
      end
    end
    # Now sort the array in descending order
    # Does adding the bitgrouppos need to happen after the sort ?
    @lookup_splits = @lookup_splits.sort do |a, b|
      b.to_a[0][1][:pos] <=> a.to_a[0][1][:pos]
    end

    current_pos = size
    countbits = {} # if countbits.method == nil

    @master = {}
    bitgroup = {}
    bitinfo = {}
    info = {}

    @lookup_splits.each_with_index do |hash, _i|
      name = hash.to_a[0][0]
      details = hash.to_a[0][1]
      bitcounter = hash.to_a[0][1][:bitgrouppos]
      pos = details[:bits] + details[:pos]
      if options[:include_spacers] && (pos != current_pos)
        collection = BitCollection.dummy(self, nil, size: current_pos - pos, pos: pos)
        yield nil, collection, bitcounter
      end
      collection = BitCollection.new(self, name)
      details[:bits].times do |i|
        collection << @bits[details[:pos] + i]
      end
      yield name, collection,  bitcounter
      current_pos = details[:pos]
    end
    if options[:include_spacers] && current_pos != 0
      collection = BitCollection.dummy(self, nil, size: current_pos, pos: 0)
      yield nil, collection,  bitcounter
    end
  end
end

#offset ⇒ Object

Returns the relative address of the given register, equivalent to calling reg.address(:relative => true)



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# File 'lib/origen/registers/reg.rb', line 694

def offset
  address(relative: true)
end

#owned_by?(name) ⇒ Boolean

Returns true if the register owner matches the given name. A match will be detected if the class names of the register’s owner contains the given name.

Alternatively if the register owner implements a method called reg_owner_alias then the value that this returns instead will also be considered when checking if the given name matches. This method can return an array of names if multiple aliases are required.

Aliases can be useful for de-coupling the commonly used name, e.g. “NVM” from the actual class name.

Examples:

class C90NVM
  include Origen::Registers

  def initialize
    add_reg :clkdiv, 0x3, 16, :div => {:bits => 8}
  end

end

reg = C90NVM.new.reg(:clkdiv)
reg.owned_by?(:ram)      # => false
reg.owned_by?(:nvm)      # => true
reg.owned_by?(:c90nvm)   # => true
reg.owned_by?(:c40nvm)   # => false
reg.owned_by?(:flash)    # => false

Using an alias

class C90NVM
  include Origen::Registers

  def initialize
    add_reg :clkdiv, 0x3, 16, :div => {:bits => 8}
  end

  def reg_owner_alias
    "flash"
  end

end

reg = C90NVM.new.reg(:clkdiv)
reg.owned_by?(:ram)      # => false
reg.owned_by?(:nvm)      # => true
reg.owned_by?(:c90nvm)   # => true
reg.owned_by?(:c40nvm)   # => false
reg.owned_by?(:flash)    # => true

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 799

def owned_by?(name)
  !!(owner.class.to_s =~ /#{name}/i) || begin
    if owner.respond_to?(:reg_owner_alias)
      [owner.reg_owner_alias].flatten.any? do |al|
        al.to_s =~ /#{name}/i
      end
    else
      false
    end
  end
end

#parse_descriptions ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/origen/registers/reg.rb', line 383

def parse_descriptions
  desc = []
  File.readlines(define_file).each do |line|
    if line =~ /^\s*#(.*)/
      desc << Regexp.last_match[1].strip
    elsif line =~ /^\s*(add_reg|reg)\(?\s*:(\w+)\s*,.*do/
      @current_reg_name = Regexp.last_match[2].to_sym
      description_lookup[define_file] ||= {}
      description_lookup[define_file][@current_reg_name] ||= {}
      description_lookup[define_file][@current_reg_name][:_reg] = desc.dup
      desc = []
    # http://www.rubular.com/r/7FidbC1JRA
    elsif @current_reg_name && line =~ /^\s*(add_bit|bit|reg\.bit)s?\(?\s*\d+\.?\.?\d*\s*,\s*:(\w+)/
      description_lookup[define_file][@current_reg_name][Regexp.last_match[2].to_sym] = desc.dup
      desc = []
    else
      desc = []
    end
  end
end

#reader ⇒ Object

Returns the object that will be responsible for reading the given register



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# File 'lib/origen/registers/reg.rb', line 674

def reader
  @reader ||= lookup_operation_handler(:read_register)
end

#request(operation, options = {}) ⇒ Object

Proxies requests from bit collections to the register owner



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# File 'lib/origen/registers/reg.rb', line 656

def request(operation, options = {}) # :nodoc:
  if operation == :read_register
    object = reader
    owner.read_register_missing!(self) unless object
  else
    object = writer
    owner.write_register_missing!(self) unless object
  end
  object.send(operation, self, options)
  self
end

#respond_to?(sym) ⇒ Boolean

Recognize that Reg responds to all BitCollection methods methods based on application-specific meta data properties

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 1125

def respond_to?(sym) # :nodoc:
  sym = sym.to_sym
  meta_data_method?(sym) || has_bits?(sym) || super(sym) || BitCollection.instance_methods.include?(sym)
end

#reverse_named_bits(_options = {}) ⇒ Object

Returns each named bit collection contained in self



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# File 'lib/origen/registers/reg.rb', line 580

def reverse_named_bits(_options = {})
  bits = []
  named_bits { |name, bit| bits << [name, bit] }
  bits.each do |bit|
    yield bit[0], bit[1]
  end
end

#update_bound_bits ⇒ Object 



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# File 'lib/origen/registers/reg.rb', line 108

def update_bound_bits
  @updating_bound_bits = true
  @parameter_bound_bits.each do |name, val|
    bits(name).write(val)
  end
  @updating_bound_bits = false
end

#updating_bound_bits? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 116

def updating_bound_bits?
  @updating_bound_bits
end

#used_bits(_options = {}) ⇒ Object

Returns an array of occupied bit positions

Example

reg :fstat, @base + 0x0000, :size => 8 do
  bit 7,  :ccif
  bit 6,  :rdcolerr
  bit 5,  :accerr
  bit 4,  :pviol
  bit 0,  :mgstat0
end
regs(:fstat).used_bits
=> [0, 4, 5, 6, 7]

Example

reg :aguahb2, @base + 0x2A, :size => 8 do
  bit 5..2, :m0b_hbstrb, :reset => 0x0
  bit 1..0, :m0b_htrans, :reset => 0x2
end
regs(:aguahb2).used_bits
=> [0, 1, 2, 3, 4, 5]



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# File 'lib/origen/registers/reg.rb', line 607

def used_bits(_options = {})
  used_bits = []
  named_bits do |_name, bit|
    used_bits << bit.position if bit.size == 1
    if bit.size > 1
      used_bits << ((bit.position)..(bit.position + bit.size - 1)).to_a
    end
  end
  used_bits.flatten!
  used_bits.sort!
  used_bits
end

#used_bits?(_options = {}) ⇒ Boolean

Returns true if any named_bits exist, false if used_bits is an empty array

Returns:

  • (Boolean) 


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# File 'lib/origen/registers/reg.rb', line 621

def used_bits?(_options = {})
  used_bits.size > 0
end

#writer ⇒ Object

Returns the object that will be responsible for writing the given register



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# File 'lib/origen/registers/reg.rb', line 669

def writer
  @writer ||= lookup_operation_handler(:write_register)
end

#|(val) ⇒ Object

Returns the BITWISE OR of reg with another reg or a number, the state of both registers remains unchanged



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# File 'lib/origen/registers/reg.rb', line 1187

def |(val)
  data | Reg.clean_value(val)
end