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Path: utzoo!linus!philabs!cmcl2!seismo!brl-tgr!internet!Ron Natalie <ron@BRL-TGR.ARPA>
From: Ron Natalie <ron@BRL-TGR.ARPA>
Newsgroups: net.unix-wizards
Subject: Re:  Mapping Kernel memory to user space
Message-ID: <5964@brl-tgr.ARPA>
Date: Tue, 20-Nov-84 15:45:06 EST
Article-I.D.: brl-tgr.5964
Posted: Tue Nov 20 15:45:06 1984
Date-Received: Thu, 22-Nov-84 06:34:53 EST
Sender: news@brl-tgr.ARPA
Organization: Ballistic Research Lab
Lines: 17

Add these to the end of uba.c

maptouser(vaddress)
	caddr_t vaddress;
{

	Sysmap[(((unsigned)(vaddress))-0x80000000) >> 9].pg_prot = (PG_UW>>27);
}

unmaptouser(vaddress)
	caddr_t vaddress;
{

	Sysmap[(((unsigned)(vaddress))-0x80000000) >> 9].pg_prot = (PG_KW>>27);
}

and then call them from an IOCTL in the device driver.