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\ Hypervisor Software File: nvram.tok
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id: @(#)nvram.tok 1.2 07/06/22
purpose: 
copyright: Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved
copyright: Use is subject to license terms.

Fcode-Version3

" nvram" 		device-name 
" nvram" 		device-type

my-space encode-int	" reg"  property

headerless

0	constant  nvraw-base
h# 1fe0	constant  /nvraw-region

0	constant  nvfixed-base
h# 40	constant  /nvfixed-region

nvfixed-base /nvfixed-region +	constant  nvhash-base
h# 1ee0				constant  /nvhash-region

nvhash-base /nvhash-region +	constant  keystore-base 
h# 100				constant  /keystore-region


0 instance value  psize		\ Partition size
0 instance value  basepos	\ Absolute offset of this partition
0 instance value  filepos	\ Current position in partition

h# f2 constant nvram-read-fun
h# f3 constant nvram-write-fun

h# 80 constant fast-trap

-1 h# 1fff - constant page#mask

: >ra ( va -- ra )
   dup >physical drop   	( vaddr papage )
   swap page#mask invert and or	( ra )
;

: hget ( offset buf,len fun# trap# -- len status )
   >r >r swap >ra swap		( offset raddr len )
   \ 3 args in, 2 out
   3 2 r> r> htrap		( len status )( R:  )
;

alias hput hget

: nvram-read ( offset addr len -- #bytes errno )
   nvram-read-fun fast-trap hget
;

: nvram-write ( offset addr len -- #bytes errno )
   nvram-write-fun fast-trap hput
;

: $=  ( adr,len adr2,len -- same? )
   rot tuck <> if  3drop false exit  then  comp 0=
;

: clip-range ( len -- len' )  psize filepos - min  ;
: bump-pos   ( n -- )         filepos + psize min to filepos  ;

external

: open ( -- true )
   nvhash-base /nvhash-region
   my-args " fixed" $= if 2drop nvfixed-base /nvfixed-region then
   my-args " keys"  $= if 2drop keystore-base /keystore-region then
   my-args " raw"   $= if 2drop nvraw-base /nvraw-region then
   to psize  to basepos				( )
   0 to filepos					( )
   true						( true )
;

: close  ( -- ) ;

: sync   ( -- )  ;

: seek ( lo hi -- fail? )
   drop	 dup 0<	 if  psize +  then			( offset )
   dup 0 psize within if			( offset )
      to filepos  false				( false )
   else						( offset )
      drop true 				( true )
   then						( failed? )
;

: read ( adr len -- len' )
   clip-range  basepos filepos +  -rot  nvram-read  if
      drop 0
   then
   dup bump-pos
;

: write ( adr len -- len' )
   clip-range  basepos filepos + -rot  nvram-write  if
      drop 0
   then
   dup bump-pos
;

\ return the number of bytes available..
: size ( -- n )	 psize filepos - ;

end0