From:	shc103 AT york DOT ac DOT uk (Steve Carter)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Page Boundaries
Date:	14 Aug 1998 12:23:53 GMT
Organization:	The University of York, UK
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Sender:	shc103 AT york DOT ac DOT uk
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Eli Zaretskii (eliz AT is DOT elta DOT co DOT il) wrote:

: On Thu, 13 Aug 1998, Endlisnis wrote:

: > I need to know that too.  I want to use __djgpp_map_physical_memory, but it
: > says I need a page-aligned data-block.  What is page-aligned and how to I
: > create/calculate a page-aligned address.

: That's something entirely different.  Page-aligned in this context
: means aligned on the 4KB pages used by the PC paging and virtual
                       ^
                       64k, I think!
: memory mechanisms.

: You get such pages either by calling `sbrk' or by allocating a larger
: block with `malloc' and using a part thereof whose starting address
: has its lower 12 bits zeroed.

Thanks.  I was wondering, but I don't think it's possible:  How about
mallocing a 128K block, to guarantee getting a whole page in there
somewhere, then free()ing parts of that block that aren't used?  I presume
this is not possible...

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