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From: Alan Cox <alc@FreeBSD.org>
Date: Fri, 15 Oct 2010 15:23:34 +0000 (UTC)
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Subject: svn commit: r213897 - head/sys/amd64/amd64
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Author: alc
Date: Fri Oct 15 15:23:34 2010
New Revision: 213897
URL: http://svn.freebsd.org/changeset/base/213897

Log:
  Update pmap_extract() to handle 1GB page mappings.  Some device drivers
  use pmap_extract() rather than pmap_kextract() on direct map addresses.
  Thus, pmap_extract() needs to be able to deal with 1GB page mappings if
  we are to use 1GB page mappings for the direct map.  (See r197580.)

Modified:
  head/sys/amd64/amd64/pmap.c

Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c	Fri Oct 15 15:16:36 2010	(r213896)
+++ head/sys/amd64/amd64/pmap.c	Fri Oct 15 15:23:34 2010	(r213897)
@@ -1163,26 +1163,33 @@ pmap_is_current(pmap_t pmap)
 vm_paddr_t 
 pmap_extract(pmap_t pmap, vm_offset_t va)
 {
-	vm_paddr_t rtval;
+	pdp_entry_t *pdpe;
+	pd_entry_t *pde;
 	pt_entry_t *pte;
-	pd_entry_t pde, *pdep;
+	vm_paddr_t pa;
 
-	rtval = 0;
+	pa = 0;
 	PMAP_LOCK(pmap);
-	pdep = pmap_pde(pmap, va);
-	if (pdep != NULL) {
-		pde = *pdep;
-		if (pde) {
-			if ((pde & PG_PS) != 0)
-				rtval = (pde & PG_PS_FRAME) | (va & PDRMASK);
-			else {
-				pte = pmap_pde_to_pte(pdep, va);
-				rtval = (*pte & PG_FRAME) | (va & PAGE_MASK);
+	pdpe = pmap_pdpe(pmap, va);
+	if (pdpe != NULL && (*pdpe & PG_V) != 0) {
+		if ((*pdpe & PG_PS) != 0)
+			pa = (*pdpe & PG_PS_FRAME) | (va & PDPMASK);
+		else {
+			pde = pmap_pdpe_to_pde(pdpe, va);
+			if ((*pde & PG_V) != 0) {
+				if ((*pde & PG_PS) != 0) {
+					pa = (*pde & PG_PS_FRAME) |
+					    (va & PDRMASK);
+				} else {
+					pte = pmap_pde_to_pte(pde, va);
+					pa = (*pte & PG_FRAME) |
+					    (va & PAGE_MASK);
+				}
 			}
 		}
 	}
 	PMAP_UNLOCK(pmap);
-	return (rtval);
+	return (pa);
 }
 
 /*