/* Except for os_zero, these routines are only called by Lisp code.
* These routines may also be replaced by os-dependent versions
/* Except for os_zero, these routines are only called by Lisp code.
* These routines may also be replaced by os-dependent versions
os_invalidate(block_start, block_size);
addr = os_validate(block_start, block_size);
os_invalidate(block_start, block_size);
addr = os_validate(block_start, block_size);