1 files changed, 79 insertions, 0 deletions
diff --git a/src/roms/SLOF/board-js2x/slof/citrine-disk.fs b/src/roms/SLOF/board-js2x/slof/citrine-disk.fs
new file mode 100644
index 0000000..146e7ec
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@@ -0,0 +1,79 @@
+\ *****************************************************************************
+\ * Copyright (c) 2004, 2008 IBM Corporation
+\ * All rights reserved.
+\ * This program and the accompanying materials
+\ * are made available under the terms of the BSD License
+\ * which accompanies this distribution, and is available at
+\ * http://www.opensource.org/licenses/bsd-license.php
+\ *
+\ * Contributors:
+\ *     IBM Corporation - initial implementation
+\ ****************************************************************************/
+
+
+( max-#blocks rsrc id -- )
+
+new-device   
+
+lwsplit swap wbsplit rot set-unit
+
+s" disk" device-name  s" block" device-type
+
+CONSTANT resource-id
+CONSTANT max-#blocks
+get-parent CONSTANT ppack
+
+
+: our-disk-read ( lba count addr -- )
+  >r >r >r resource-id r> r> r> s" do-read" ppack $call-static ;
+
+0 pci-alias-disk
+
+\ Requiered interface for deblocker
+
+200   CONSTANT block-size
+40000 CONSTANT max-transfer 
+
+: read-blocks ( addr block# #blocks -- #read )
+\   my-unit s" dev-read-blocks" $call-parent
+   \ check if the read is within max-#blocks
+   2dup + max-#blocks 1 + > IF 
+     \ 2drop drop 0 \ return 0 
+     \ returning 0 would be correct (maybe?) but it confuses the deblocker...
+     \ so i erase whatever would have been read and return the "expected" #read
+     dup >r 
+     swap drop \ drop block# (not needed)
+     block-size * erase \ erase at addr #blocks * block-size
+     r>   \ return #read 
+   ELSE
+     dup >r rot our-disk-read r>
+   THEN
+;    
+
+INSTANCE VARIABLE deblocker
+
+: open ( -- okay? )
+   0 0 s" deblocker" $open-package dup deblocker ! dup IF 
+      s" disk-label" find-package IF
+	 my-args rot interpose
+      THEN
+   THEN 0<> ;
+
+: close ( -- )
+   deblocker @ close-package ;
+
+: seek ( pos.lo pos.hi -- status )
+   2dup lxjoin max-#blocks 1 + block-size *  > IF 
+     \ illegal seek, return -1
+     2drop -1
+   ELSE
+     s" seek" deblocker @ $call-method
+   THEN
+;
+
+: read ( addr len -- actual )
+   s" read" deblocker @ $call-method ;
+
+
+finish-device
+