69 lines
1.9 KiB
Forth
69 lines
1.9 KiB
Forth
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\ *****************************************************************************
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\ * Copyright (c) 2004, 2008 IBM Corporation
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\ * All rights reserved.
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\ * This program and the accompanying materials
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\ * are made available under the terms of the BSD License
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\ * which accompanies this distribution, and is available at
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\ * http://www.opensource.org/licenses/bsd-license.php
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\ *
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\ * Contributors:
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\ * IBM Corporation - initial implementation
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\ ****************************************************************************/
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\ Generic disk support
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\ Input:
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\ name of device ( e.g. "disk", "cdrom", ... )
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\ dev#
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\ Needs from parent in device tree:
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\ dev-read-blocks ( addr block# #blocks phys.lo ... phys.hi -- #read )
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\ block-size
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\ max-transfer
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\ Provides:
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\ open ( -- okay? )
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\ close ( -- )
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\ read ( addr len -- actual )
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\ seek ( pos.lo pos.hi -- status )
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\ read-blocks ( addr block# #blocks -- #read )
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\ Uses:
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\ disk-label package interpose for partition and file systems support
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\ deblocker package for byte read support
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( str len phys.lo ... phys.hi -- )
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new-device set-unit ( str len )
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2dup device-name
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s" 0 pci-alias-" 2swap $cat evaluate
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s" block" device-type
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\ Requiered interface for deblocker
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s" block-size" $call-parent CONSTANT block-size
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s" max-transfer" $call-parent CONSTANT max-transfer
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: read-blocks ( addr block# #blocks -- #read )
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my-unit s" dev-read-blocks" $call-parent
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;
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INSTANCE VARIABLE deblocker
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: open ( -- okay? )
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0 0 s" deblocker" $open-package dup deblocker ! dup IF
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s" disk-label" find-package IF
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my-args rot interpose
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THEN
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THEN 0<> ;
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: close ( -- )
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deblocker @ close-package ;
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: seek ( pos.lo pos.hi -- status )
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s" seek" deblocker @ $call-method ;
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: read ( addr len -- actual )
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s" read" deblocker @ $call-method ;
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finish-device
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