Add a facility to register a range of physical addresses to be used

for allocation of fictitious pages, for which PHYS_TO_VM_PAGE()
returns proper fictitious vm_page_t. The range should be de-registered
after consumer stopped using it.

De-inline the PHYS_TO_VM_PAGE() since it now carries code to iterate
over registered ranges.

A hash container might be developed instead of range registration
interface, and fake pages could be put automatically into the hash,
were PHYS_TO_VM_PAGE() could look them up later. This should be
considered before the MFC of the commit is done.

Sponsored by:	The FreeBSD Foundation
Reviewed by:	alc
MFC after:	1 month

1 files changed, 1 insertions, 13 deletions

diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h
index cad8c03..479c5bf 100644
--- a/sys/vm/vm_page.h
+++ b/sys/vm/vm_page.h
@@ -321,19 +321,7 @@ extern long first_page;			/* first physical page number */
 
 vm_page_t vm_phys_paddr_to_vm_page(vm_paddr_t pa);
 
-static __inline vm_page_t PHYS_TO_VM_PAGE(vm_paddr_t pa);
-
-static __inline vm_page_t
-PHYS_TO_VM_PAGE(vm_paddr_t pa)
-{
-#ifdef VM_PHYSSEG_SPARSE
-	return (vm_phys_paddr_to_vm_page(pa));
-#elif defined(VM_PHYSSEG_DENSE)
-	return (&vm_page_array[atop(pa) - first_page]);
-#else
-#error "Either VM_PHYSSEG_DENSE or VM_PHYSSEG_SPARSE must be defined."
-#endif
-}
+vm_page_t PHYS_TO_VM_PAGE(vm_paddr_t pa);
 
 extern struct vpglocks vm_page_queue_lock;