Rework the OpenBIOS internals so that boot, load and init-program now all use the unified libopenbios loader code with improved

IEEE-1275 spec compliance.

This patch implements the following:

1) Fix bootpath/bootargs handling so that default values are read from NVRAM, and allow multiple space-separated values to be 
specified.
2) With correct bootargs handling in place, move the ELF loader over to the new libopenbios unified loaders.
3) Remove all the loader code from all architecture directories sine we don't need it anymore.
4) Simplify the boot word so it invokes platform-specific code where required, then calls load and go as per the specification.

Tested on all my available images for SPARC32, SPARC64 and PPC, and compile-tested on x86.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@siriusit.co.uk>


git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@828 f158a5a8-5612-0410-a976-696ce0be7e32

forth/debugging/client.fs

@@ -58,24 +58,55 @@ variable file-size
 : (encode-bootpath) ( "{params}<cr>" -- bootpath-str bootpath-len)
   \ Parse the current input buffer of a load/boot command and set both
   \ the bootargs and bootpath properties as appropriate.
-  bl parse dup if
-    2dup encode-string
-    " /chosen" (find-dev) if
-      " bootpath" rot (property)
-    then
-  then
-  linefeed parse dup if
-    encode-string
-    " /chosen" (find-dev) if
-      " bootargs" rot (property)
-    then
-  else
+  cr
+
+  \ bootpath
+  bl parse dup 0= if
+
+    \ None specified. As per IEEE-1275 specification, search through each value
+    \ in boot-device and use the first that returns a valid ihandle on open.
+    s" boot-device" $find drop execute 
+    bl left-split
+    begin 
+      dup 
+    while
+      2dup s" Trying " type type s" ..." type cr
+      2dup open-dev ?dup if
+        close-dev
+	2swap drop 0	\ Fake end of string so we exit loop
+      else
+        2drop
+        bl left-split
+      then
+    repeat
     2drop
+  else
+    0 0 2swap		\ Fake (empty) parse string
   then
+
+  \ Set the bootpath property
+  2dup encode-string
+  " /chosen" (find-dev) if
+    " bootpath" rot (property)
+  then
+
+  \ bootargs
+  linefeed parse dup 0= if
+    \ None specified, use default from nvram
+    2drop s" boot-file" $find drop execute
+  then
+
+  \ Set the bootargs property
+  encode-string
+  " /chosen" (find-dev) if
+    " bootargs" rot (property)
+  then
+
+  \ Remove the remaining string
+  2swap 2drop
 ;
 
-: load    ( "{params}<cr>" -- )
-  (encode-bootpath)
+: $load ( devstr len )
   open-dev ( ihandle )
   dup 0= if
     drop
@@ -89,6 +120,11 @@ variable file-size
   init-program
   ;
 
+: load    ( "{params}<cr>" -- )
+  (encode-bootpath)
+  $load
+;
+
 : dir ( "{paths}<cr>" -- )
   linefeed parse
   split-path-device