Date: Thu, 07 Mar 2002 13:09:40 +0100 (MET) From: Andy Sporner <sporner@nentec.de> To: "Valery N. Khromov" <valery.khromov@icluk.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: RE: Converting physical into virtual address Message-ID: <XFMail.020307130940.sporner@nentec.de> In-Reply-To: <009c01c1c356$93e13be0$c80ca8c0@khromovv>
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On 04-Mar-02 Valery N. Khromov wrote: > I'd like to develop a kernel module for FreeBSD, able to read & write > directly to VGA text-mode screen buffer. I know that this buffer is located > at 0xB8000 in physical address space. But in kernel I must address it using > kernel virtual address space. > > Thus, the question is: how can I _correctly_ convert physical address into > kernel virtual address? > > Now I use the following trick: 0xC0000000 + 0xB8000, but I want to use more > correct method. :) > > thanks. > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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