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46f2ccaf6d
the private wordlist by default. This is required for executing Milax Fcode which defines package words which need to be externally visible. As a consequence, it is now possible to remove lots of "external" words used building the device tree since this is now the default. git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@655 f158a5a8-5612-0410-a976-696ce0be7e32
64 lines
2.1 KiB
Forth
64 lines
2.1 KiB
Forth
\ tag: deblocker support package
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\
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\ Copyright (C) 2003 Stefan Reinauer
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\
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\ See the file "COPYING" for further information about
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\ the copyright and warranty status of this work.
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\
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" /packages" find-device
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\ The deblocker package makes it easy to implement byte-oriented device
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\ methods, using the block-oriented or record-oriented methods defined by
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\ devices such as disks or tapes. It provides a layer of buffering between
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\ the high-level byte-oriented interface and the low-level block-oriented
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\ interface. deblocker uses the max-transfer, block-size, read-blocks and
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\ write-blocks methods of its parent.
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new-device
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" deblocker" device-name
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\ open ( -- flag )
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\ Prepares the package for subsequent use, allocating the buffers used
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\ by the deblocking process based upon the values returned by the parent
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\ instance's max-transfer and block-size methods. Returns -1 if the
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\ operation succeeds, 0 otherwise.
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: open ( -- flag )
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;
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\ close ( -- )
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\ Frees all resources that were allocated by open.
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: close ( -- )
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;
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\ read ( adr len -- actual )
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\ Reads at most len bytes from the device into the memory buffer
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\ beginning at adr. Returns actual, the number of bytes actually
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\ read, or 0 if the read operation failed. Uses the parent's read-
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\ blocks method as necessary to satisfy the request, buffering any
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\ unused bytes for the next request.
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: read ( adr len -- actual )
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;
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\ Writes at most len bytes from the device into the memory buffer
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\ beginning at adr. Returns actual, the number of bytes actually
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\ read, or 0 if the write operation failed. Uses the parent's write-
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\ blocks method as necessary to satisfy the request, buffering any
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\ unused bytes for the next request.
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: write ( adr len -- actual )
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;
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\ Sets the device position at which the next read or write will take
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\ place. The position is specified by the 64-bit number x.position.
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\ Returns 0 if the operation succeeds or -1 if it fails.
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: seek ( x.position -- flag )
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;
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finish-device
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\ clean up afterwards
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device-end
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