Date: Thu, 16 Apr 1998 11:38:46 -0700 From: Mike Smith <mike@smith.net.au> To: Karl Pielorz <kpielorz@tdx.co.uk> Cc: hackers@FreeBSD.ORG Subject: Re: Memory mapping via Syscons? Message-ID: <199804161838.LAA00640@dingo.cdrom.com> In-Reply-To: Your message of "Thu, 16 Apr 1998 19:33:07 BST." <35364EE3.2043BF4A@tdx.co.uk>
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> I've read somewhere that you can use syscons to map IO memory into > 'userland'? Is this possible? Yes. > I have a simple ISA card that maps in at 0x240 - 0x24F - which I'd like to > read and write to without going through creating a kernel device driver > etc... That's not memory, that's I/O space. Open /dev/io and then use the functions in <machine/cpufunc.h> to perform I/O. > A device driver will probably follow - but if I can just get to the card I > can use a heap of existing code I've allready got to drive it - and worry > about the driver when I have more time... We built a commercial product using user-mode I/O that managed well over 1M/sec using that interface. For many applications, there's no need to do anything more complex. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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