svn commit: r305880 - stable/11/sys/arm64/arm64

[Andrew Turner]

Author: andrew
Date: Fri Sep 16 12:18:22 2016
New Revision: 305880
URL: https://svnweb.freebsd.org/changeset/base/305880

Log:
  MFC 303903:
  Implement pmap_align_superpage on arm64 based on the amd64 implementation.
  This will be needed when superpage support is added.
  
  Obtained from:	ABT Systems Ltd
  Sponsored by:	The FreeBSD Foundation

Modified:
  stable/11/sys/arm64/arm64/pmap.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/arm64/arm64/pmap.c
==============================================================================
--- stable/11/sys/arm64/arm64/pmap.c	Fri Sep 16 12:17:01 2016	(r305879)
+++ stable/11/sys/arm64/arm64/pmap.c	Fri Sep 16 12:18:22 2016	(r305880)
@@ -3490,6 +3490,20 @@ void
 pmap_align_superpage(vm_object_t object, vm_ooffset_t offset,
     vm_offset_t *addr, vm_size_t size)
 {
+	vm_offset_t superpage_offset;
+
+	if (size < L2_SIZE)
+		return;
+	if (object != NULL && (object->flags & OBJ_COLORED) != 0)
+		offset += ptoa(object->pg_color);
+	superpage_offset = offset & L2_OFFSET;
+	if (size - ((L2_SIZE - superpage_offset) & L2_OFFSET) < L2_SIZE ||
+	    (*addr & L2_OFFSET) == superpage_offset)
+		return;
+	if ((*addr & L2_OFFSET) < superpage_offset)
+		*addr = (*addr & ~L2_OFFSET) + superpage_offset;
+	else
+		*addr = ((*addr + L2_OFFSET) & ~L2_OFFSET) + superpage_offset;
 }
 
 /**