source_bytcnt

    Source byte count.

 dest_pagcnt

    Destination of page count.

 rightshift

    Location of application-provided value to shift (in place of
    multiply). This value is a function of the page size, as shown in
    the table on shift values.

 roundup=YES

    If YES, page-size-1 is added to byte count before shifting;
    if NO, page count is truncated. Any other value is treated as
    the user-specified address of the page-size-1 value. Note that
    roundup=YES is incompatible with the presence of the rightshift
    argument; invoking the macro with both these arguments generates
    a compile-time warning.

 quad=YES

    If YES, the conversion supports 64-bit addressing. If NO, the
    conversion does not support 64-bit addressing.