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/*
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* XMS driver
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*
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* This file is part of the Mateusz' DOS Routines (MDR): http://mdr.osdn.io
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* Published under the terms of the MIT License, as stated below.
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*
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* Copyright (C) 2014-2022 Mateusz Viste
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef MDR_XMS_H
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#define MDR_XMS_H
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struct xms_struct {
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unsigned int handle;
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long memsize; /* allocated memory size, in bytes */
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};
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/* checks if a XMS driver is installed, inits it and allocates a memory block of memsize K-bytes.
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* if memsize is 0, then the maximum possible block will be allocated.
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* returns the amount of allocated memory (in K-bytes) on success, 0 otherwise. */
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unsigned int xms_init(struct xms_struct *xms, unsigned int memsize);
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/* free XMS memory */
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void xms_close(struct xms_struct *xms);
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/* copies a chunk of memory from conventional memory into the XMS block.
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returns 0 on sucess, non-zero otherwise. */
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int xms_push(struct xms_struct *xms, void far *src, unsigned int len, long xmsoffset);
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/* copies a chunk of memory from the XMS block into conventional memory */
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int xms_pull(struct xms_struct *xms, long xmsoffset, void far *dst, unsigned int len);
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#endif
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