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• Ctr-reads-and-writes

!ctri-write

Signature

(!ctri-write ctr-index val x86) → x86

Arguments

ctr-index — Guard (natp ctr-index).

val — Guard (n64p val).

Returns

x86 — Type (x86p x86), given (x86p x86).

Definitions and Theorems

Function: !ctri-write

(defun !ctri-write (ctr-index val x86)
  (declare (xargs :stobjs (x86)))
  (declare (xargs :guard (and (natp ctr-index) (n64p val))))
  (declare (xargs :guard (< ctr-index 17)))
  (let ((__function__ '!ctri-write))
    (declare (ignorable __function__))
    (b* ((val-write (case ctr-index
                      (*cr0* (loghead 32 val))
                      (*cr4* (logapp 21 val (ctri *cr4* x86)))
                      (otherwise val)))
         (x86 (!ctri ctr-index val-write x86)))
      x86)))

Theorem: x86p-of-!ctri-write

(defthm x86p-of-!ctri-write
  (implies (x86p x86)
           (b* ((x86 (!ctri-write ctr-index val x86)))
             (x86p x86)))
  :rule-classes :rewrite)