# Copyright (c) 2013, The Linux Foundation. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 and
# only version 2 as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.


def bm(msb, lsb):
    'Creates a bitmask from msb to lsb'
    return int(('1' * (msb - lsb + 1)) + ('0' * lsb), 2)


def bvalsel(msb, lsb, val):
    'Masks and returns the bits from msb to lsb in val'
    return ((val & bm(msb, lsb)) >> lsb)