svn commit: r303903 - head/sys/arm64/arm64

[Andrew Turner]

Author: andrew
Date: Wed Aug 10 10:13:34 2016
New Revision: 303903
URL: https://svnweb.freebsd.org/changeset/base/303903

Log:
  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
  MFC after:	1 month
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/sys/arm64/arm64/pmap.c

Modified: head/sys/arm64/arm64/pmap.c
==============================================================================
--- head/sys/arm64/arm64/pmap.c	Wed Aug 10 08:05:48 2016	(r303902)
+++ head/sys/arm64/arm64/pmap.c	Wed Aug 10 10:13:34 2016	(r303903)
@@ -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;
 }
 
 /**