(in-package "SB!VM")

(def!constant +backend-fasl-file-implementation+ :ppc)
(setf *backend-register-save-penalty* 3)
(setf *backend-byte-order* :big-endian)

(eval-when (:compile-toplevel :load-toplevel :execute)
  ;; On Linux, the ABI specifies the page size to be 4k-64k, use the
  ;; maximum of that range. FIXME: it'd be great if somebody would
  ;; find out whether using exact multiples of the page size actually
  ;; matters in the few places where that's done, or whether we could
  ;; just use 4k everywhere.
  (setf *backend-page-bytes* #!+linux 65536 #!-linux 4096))

;;; The size in bytes of GENCGC cards, i.e. the granularity at which
;;; writes to old generations are logged.  With mprotect-based write
;;; barriers, this must be a multiple of the OS page size.
(def!constant gencgc-card-bytes *backend-page-bytes*)
;;; The minimum size of new allocation regions.  While it doesn't
;;; currently make a lot of sense to have a card size lower than
;;; the alloc granularity, it will, once we are smarter about finding
;;; the start of objects.
(def!constant gencgc-alloc-granularity 0)
;;; The minimum size at which we release address ranges to the OS.
;;; This must be a multiple of the OS page size.
(def!constant gencgc-release-granularity *backend-page-bytes*)