Access the |X86ISA|::|OFFSET31-16| field of a interrupt/trap-gate-descriptorbits bit structure.
(interrupt/trap-gate-descriptorbits->offset31-16 x) → offset31-16
Function:
(defun interrupt/trap-gate-descriptorbits->offset31-16$inline (x) (declare (xargs :guard (interrupt/trap-gate-descriptorbits-p x))) (mbe :logic (let ((x (interrupt/trap-gate-descriptorbits-fix x))) (part-select x :low 48 :width 16)) :exec (the (unsigned-byte 16) (logand (the (unsigned-byte 16) 65535) (the (unsigned-byte 80) (ash (the (unsigned-byte 128) x) -48))))))
Theorem:
(defthm 16bits-p-of-interrupt/trap-gate-descriptorbits->offset31-16 (b* ((offset31-16 (interrupt/trap-gate-descriptorbits->offset31-16$inline x))) (16bits-p offset31-16)) :rule-classes :rewrite)
Theorem:
(defthm interrupt/trap-gate-descriptorbits->offset31-16$inline-of-interrupt/trap-gate-descriptorbits-fix-x (equal (interrupt/trap-gate-descriptorbits->offset31-16$inline (interrupt/trap-gate-descriptorbits-fix x)) (interrupt/trap-gate-descriptorbits->offset31-16$inline x)))
Theorem:
(defthm interrupt/trap-gate-descriptorbits->offset31-16$inline-interrupt/trap-gate-descriptorbits-equiv-congruence-on-x (implies (interrupt/trap-gate-descriptorbits-equiv x x-equiv) (equal (interrupt/trap-gate-descriptorbits->offset31-16$inline x) (interrupt/trap-gate-descriptorbits->offset31-16$inline x-equiv))) :rule-classes :congruence)
Theorem:
(defthm interrupt/trap-gate-descriptorbits->offset31-16-of-interrupt/trap-gate-descriptorbits (equal (interrupt/trap-gate-descriptorbits->offset31-16 (interrupt/trap-gate-descriptorbits offset15-0 selector ist res1 type s dpl p offset31-16 offset63-32 res2 all-zeros? res3)) (16bits-fix offset31-16)))
Theorem:
(defthm interrupt/trap-gate-descriptorbits->offset31-16-of-write-with-mask (implies (and (fty::bitstruct-read-over-write-hyps x interrupt/trap-gate-descriptorbits-equiv-under-mask) (interrupt/trap-gate-descriptorbits-equiv-under-mask x y fty::mask) (equal (logand (lognot fty::mask) 18446462598732840960) 0)) (equal (interrupt/trap-gate-descriptorbits->offset31-16 x) (interrupt/trap-gate-descriptorbits->offset31-16 y))))