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Ia32e-paging

Page-size

Signature
(page-size entry) → bit
Returns: bit — Type (unsigned-byte-p 1 bit).

Definitions and Theorems

Function: page-size

(defun page-size (entry)
  (declare (type (unsigned-byte 64) entry))
  (let ((__function__ 'page-size))
    (declare (ignorable __function__))
    (ia32e-page-tablesbits->ps entry)))

Theorem: return-type-of-page-size

(defthm return-type-of-page-size
  (b* ((bit (page-size entry)))
    (unsigned-byte-p 1 bit))
  :rule-classes :rewrite)

Theorem: n01p-page-size

(defthm n01p-page-size
 (unsigned-byte-p 1 (page-size val))
 :rule-classes
 (:rewrite
  (:type-prescription
      :corollary (natp (page-size val))
      :hints
      (("Goal" :in-theory '(unsigned-byte-p integer-range-p natp))))
  (:linear
   :corollary (and (<= 0 (page-size val))
                   (< (page-size val) 2))
   :hints
   (("Goal"
        :in-theory '(unsigned-byte-p integer-range-p (:e expt)))))))