r1316 - ofw/core

Author: wmb
Date: 2009-08-21 11:28:53 +0200 (Fri, 21 Aug 2009)
New Revision: 1316

Modified:
   ofw/core/bootparm.fth
Log:
New "last" devalias reports the device name of the device that
was last used for load/boot.  It's useful in e.g. /boot/olpc.fth
for chaining to a file on the same device.

Modified: ofw/core/bootparm.fth
===================================================================
--- ofw/core/bootparm.fth	2009-08-21 09:27:16 UTC (rev 1315)
+++ ofw/core/bootparm.fth	2009-08-21 09:28:53 UTC (rev 1316)
@@ -95,6 +95,13 @@
    then
 ;

+: make-last-alias  ( adr len -- )
+   [char] \ left-parse-string 2nip          ( dev$ )
+   dup 0=  if   2drop exit  then            ( dev$ )
+   2dup + 1- c@  [char] : =  if  1-  then   ( dev$' )
+   " last" 2swap $devalias                  ( )
+;
+
 : (boot-read)  ( adr len -- )
    opened-ih  if                        ( adr len )
       2drop  opened-ih  0 to opened-ih  ( ihandle )
@@ -105,7 +112,9 @@
       ( print-probe-list )
       true abort" "r"nCan't open boot device"r"n"
    then                                         ( fileid )
-   dup ihandle>devname limit-1023 load-path place-cstr drop ( fileid )
+   dup ihandle>devname                          ( fileid path$ )
+   2dup make-last-alias                         ( fileid path$ )
+   limit-1023 load-path place-cstr drop         ( fileid )
    >r                                           ( )
    load-started
    0 !load-size  load-base                      ( load-adr )