Date: Fri, 04 Dec 1998 15:18:22 +0100 From: Johan Karlsson <k@numeri.campus.luth.se> To: freebsd-hackers@FreeBSD.ORG Subject: Cache disabling Message-ID: <199812041418.PAA26753@numeri.campus.luth.se>
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Hi
I'm using 2.2-Stable and want to disable caching for some memory.
Will the page with the physical address phys have caching disabled if the
function (see patch below) pmap_page_noncacheable is used?
Is there another (better) way to do it?
If not, could this patch make it into the src tree (when I submit a PR)?
==== patch =====
*** i386/i386/pmap.c.orig Fri Dec 4 11:32:21 1998
--- i386/i386/pmap.c Fri Dec 4 11:44:59 1998
***************
*** 2771,2776 ****
--- 2771,2789 ----
}
/*
+ * pmap_page_noncacheable:
+ *
+ * Set/Clear Non-cacheable option (i.e. PG_N) for page
+ */
+ void
+ pmap_page_noncacheable(phys, noncacheable)
+ vm_offset_t phys;
+ boolean_t noncacheable;
+ {
+ pmap_changebit(phys, PG_N, noncacheable);
+ }
+
+ /*
* pmap_page_protect:
*
* Lower the permission for all mappings to a given page.
===============
/K
--
Johan Karlsson mailto:k@numeri.campus.luth.se
SWEDEN
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