Date: Mon, 07 Dec 1998 23:23:56 +0100 From: Johan Karlsson <k@numeri.campus.luth.se> To: "Ron G. Minnich" <rminnich@Sarnoff.COM> Cc: hackers@FreeBSD.ORG Subject: Re: write combining memory on pci Message-ID: <199812072223.XAA03758@numeri.campus.luth.se> In-Reply-To: Your message of "Mon, 07 Dec 1998 15:48:33 EST." <Pine.SUN.3.91.981207154806.9378D-100000@terra>
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At Mon, 07 Dec 1998 15:48:33 EST, "Ron G. Minnich" wrote: >any good ideas on how to turn this on in 3.0 for a given memory address >range? > This can be done using the MTRRs (Memory Type Range Registers) on a Ppro or PII. There are some functions in i386/i386/pmap.c to read and write those registers. (I don't know if the registers are enabled by default) For more info about the registers see http://www.intel.com/design/pro/manuals chapter 9 in "Intel Architecture Software Developer's Manual, Volume 3: System Programming Guide" Usualy the BIOS sets these registers. You can screw up the memory management bad if you don't know what you are doing. Take small steps :-) /Johan K -- Johan Karlsson mailto:k@numeri.campus.luth.se SWEDEN To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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