Extend the device pager to support different memory attributes on different

pages in an object.
- Add a new variant of d_mmap() currently called d_mmap2() which accepts
  an additional in/out parameter that is the memory attribute to use for
  the requested page.
- A driver either uses d_mmap() or d_mmap2() for all requests but not both.
  The current implementation uses a flag in the cdevsw (D_MMAP2) to indicate
  that the driver provides a d_mmap2() handler instead of d_mmap().  This
  is done to make the change ABI compatible with existing drivers and
  MFC'able to 7 and 8.

Submitted by:	alc
MFC after:	1 month

1 files changed, 6 insertions, 6 deletions

diff --git a/sys/vm/vm.h b/sys/vm/vm.h
index b547514..941300a 100644
--- a/sys/vm/vm.h
+++ b/sys/vm/vm.h
@@ -63,12 +63,6 @@
 
 #include <machine/vm.h>
 
-/*
- * The exact set of memory attributes is machine dependent.  However, every
- * machine is required to define VM_MEMATTR_DEFAULT.
- */
-typedef	char vm_memattr_t;	/* memory attribute codes */
-
 typedef char vm_inherit_t;	/* inheritance codes */
 
 #define	VM_INHERIT_SHARE	((vm_inherit_t) 0)
@@ -115,6 +109,12 @@ typedef struct vm_object *vm_object_t;
 typedef int boolean_t;
 
 /*
+ * The exact set of memory attributes is machine dependent.  However, every
+ * machine is required to define VM_MEMATTR_DEFAULT.
+ */
+typedef	char vm_memattr_t;	/* memory attribute codes */
+
+/*
  * This is defined in <sys/types.h> for the kernel so that vnode_if.h
  * doesn't have to include <vm/vm.h>.
  */