From:	"Heo, Sung-Gwan" <heo AT turbotek DOT co DOT kr>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Memory mapped I/O in protected mode
Date:	Wed, 19 Nov 1997 21:22:49 +0900
Organization:	S/W Team, Turbo Tek
Lines:	55
Message-ID:	<3472DA18.223AD317@turbotek.co.kr>
Reply-To:	heo AT turbotek DOT co DOT kr
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To:	djgpp AT delorie DOT com
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Hi, there.

How do I write a program that performs memory mapped I/O in protected
mode?
I have a I/O card which use D000:0000 ~ D000:0800 memory space for
memory mapped I/O, but I must program in 32bit protected mode.

The following program style is typically for 16bit environment and
threre is a critical problem in 32bit protected mode.

        unsigned int    far *crptr;
        crptr = (unsigned int far *) 0xd0000800L;
        *crptr = 10;

How can I write a 32bit protected mode program which does the same as
above code?
In addition, I use PMODE 3.0 as DOS extender and PMC library.

Please let me know.

Thanks in advance.

--
Heo, Sung-Gwan
heo AT turbotek DOT co DOT kr

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