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From: Alan Cox <alc@FreeBSD.org>
Date: Wed, 14 Dec 2011 23:57:47 +0000 (UTC)
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Subject: svn commit: r228513 - head/sys/i386/i386
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Author: alc
Date: Wed Dec 14 23:57:47 2011
New Revision: 228513
URL: http://svn.freebsd.org/changeset/base/228513

Log:
  Create large page mappings in pmap_map().
  
  MFC after:	6 weeks

Modified:
  head/sys/i386/i386/pmap.c

Modified: head/sys/i386/i386/pmap.c
==============================================================================
--- head/sys/i386/i386/pmap.c	Wed Dec 14 23:26:48 2011	(r228512)
+++ head/sys/i386/i386/pmap.c	Wed Dec 14 23:57:47 2011	(r228513)
@@ -1450,12 +1450,40 @@ vm_offset_t
 pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot)
 {
 	vm_offset_t va, sva;
+	vm_paddr_t superpage_offset;
+	pd_entry_t newpde;
 
-	va = sva = *virt;
+	va = *virt;
+	/*
+	 * Does the physical address range's size and alignment permit at
+	 * least one superpage mapping to be created?
+	 */ 
+	superpage_offset = start & PDRMASK;
+	if ((end - start) - ((NBPDR - superpage_offset) & PDRMASK) >= NBPDR) {
+		/*
+		 * Increase the starting virtual address so that its alignment
+		 * does not preclude the use of superpage mappings.
+		 */
+		if ((va & PDRMASK) < superpage_offset)
+			va = (va & ~PDRMASK) + superpage_offset;
+		else if ((va & PDRMASK) > superpage_offset)
+			va = ((va + PDRMASK) & ~PDRMASK) + superpage_offset;
+	}
+	sva = va;
 	while (start < end) {
-		pmap_kenter(va, start);
-		va += PAGE_SIZE;
-		start += PAGE_SIZE;
+		if ((start & PDRMASK) == 0 && end - start >= NBPDR &&
+		    pseflag) {
+			KASSERT((va & PDRMASK) == 0,
+			    ("pmap_map: misaligned va %#x", va));
+			newpde = start | PG_PS | pgeflag | PG_RW | PG_V;
+			pmap_kenter_pde(va, newpde);
+			va += NBPDR;
+			start += NBPDR;
+		} else {
+			pmap_kenter(va, start);
+			va += PAGE_SIZE;
+			start += PAGE_SIZE;
+		}
 	}
 	pmap_invalidate_range(kernel_pmap, sva, va);
 	*virt = va;