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Make-system-segment-attr-field

Constructor for the System Segment attribute field

Signature

(make-system-segment-attr-field descriptor) → *

Definitions and Theorems

Function: make-system-segment-attr-field

(defun make-system-segment-attr-field (descriptor)
  (declare (type (unsigned-byte 128) descriptor))
  (let ((__function__ 'make-system-segment-attr-field))
    (declare (ignorable __function__))
    (b* ((type (system-segment-descriptorbits->type descriptor))
         (s (system-segment-descriptorbits->s descriptor))
         (dpl (system-segment-descriptorbits->dpl descriptor))
         (p (system-segment-descriptorbits->p descriptor))
         (avl (system-segment-descriptorbits->avl descriptor))
         (g (system-segment-descriptorbits->g descriptor)))
      (change-system-segment-descriptor-attributesbits 0
                                                       :type type
                                                       :s s
                                                       :dpl dpl
                                                       :p p
                                                       :avl avl
                                                       :g g))))

Theorem: n16p-make-system-segment-attr

(defthm n16p-make-system-segment-attr
 (implies
      (unsigned-byte-p 128 descriptor)
      (unsigned-byte-p 16
                       (make-system-segment-attr-field descriptor)))
 :rule-classes
 (:rewrite
  (:type-prescription
      :corollary
      (implies (unsigned-byte-p 128 descriptor)
               (natp (make-system-segment-attr-field descriptor)))
      :hints
      (("Goal" :in-theory '(unsigned-byte-p integer-range-p natp))))
  (:linear
   :corollary
   (implies (unsigned-byte-p 128 descriptor)
            (and (<= 0
                     (make-system-segment-attr-field descriptor))
                 (< (make-system-segment-attr-field descriptor)
                    65536)))
   :hints
   (("Goal"
        :in-theory '(unsigned-byte-p integer-range-p (:e expt)))))))