		Search-engine friendly clone of the ACL2 documentation.

Ia32e-paging

Page-present

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

Definitions and Theorems

Function: page-present

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

Theorem: return-type-of-page-present

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

Theorem: n01p-page-present

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