obp/obp/pkg/dhcp/ethernet.fth

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\ Hypervisor Software File: ethernet.fth
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id: @(#)ethernet.fth 2.10 02/08/22
purpose: Definitions related to Ethernet headers and addresses
copyright: Copyright 1990-2002 Sun Microsystems, Inc.  All Rights Reserved
copyright: Use is subject to license terms.

hex

headerless
6 instance buffer: my-en-addr
6 instance buffer: his-en-addr
create broadcast-en-addr  ff c, ff c, ff c, ff c, ff c, ff c,

decimal

instance variable active-struct

: active-struct@ ( -- adr )  active-struct @ ;

\ Access to composite data in Internet byte order (big-endian)

: be-l!  ( l adr -- )  >r lbsplit r@ c! r@ ca1+ c! r@ 2 ca+ c! r> 3 ca+ c!  ;
: be-l@  ( adr -- l )  dup 3 ca+ c@  swap dup 2 ca+ c@  swap dup ca1+ c@  swap c@ bljoin  ;
: be-w@  ( adr -- w )  dup 1+ c@ swap c@ bwjoin  ;
: be-w!  ( w adr -- )  >r wbsplit  r@ c!  r> 1+ c!  ;

struct ( ether-header )
   6 field >en-dest-addr
   6 field >en-source-addr
   2 field >en-type
constant /ether-header

: en-dest-addr   ( -- adr )  active-struct@ >en-dest-addr ;
: en-source-addr ( -- adr )  active-struct@ >en-source-addr ;
: en-type        ( -- adr )  active-struct@ >en-type ;

: broadcast-en-addr?  ( adr-buf -- flag )
   broadcast-en-addr 6  comp  0=
;

headers

\ Display Ethernet address
: u..  ( n -- )  (u.) type  ;
: .enaddr  ( addr-buff -- )
   base @ >r  hex
   5 0 do  dup c@ u.. 1+  ." :"  loop  c@ u..
   r> base !
;