Move uvm_pmr_zero_everything() to subr_hibernate.

This function will probably die before ever being called
from the in-tree code, since hibernate will move to RLE encoding.

No functional change, function had no callers.

1 files changed, 41 insertions, 1 deletions

diff --git a/sys/kern/subr_hibernate.c b/sys/kern/subr_hibernate.c
index 51d376b126e..f9159b5853e 100644
--- a/sys/kern/subr_hibernate.c
+++ b/sys/kern/subr_hibernate.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: subr_hibernate.c,v 1.1 2011/07/08 17:58:16 ariane Exp $	*/
+/*	$OpenBSD: subr_hibernate.c,v 1.2 2011/07/08 18:20:10 ariane Exp $	*/
 
 /*
  * Copyright (c) 2011 Ariane van der Steldt <ariane@stack.nl>
@@ -21,6 +21,7 @@
 #include <sys/tree.h>
 #include <sys/types.h>
 #include <sys/systm.h>
+#include <uvm/uvm.h>
 
 
 /*
@@ -222,3 +223,42 @@ hiballoc_init(struct hiballoc_arena *arena, void *p_ptr, size_t p_len)
 
 	return 0;
 }
+
+
+/*
+ * Zero all free memory.
+ */
+void
+uvm_pmr_zero_everything(void)
+{
+	struct uvm_pmemrange	*pmr;
+	struct vm_page		*pg;
+	int			 i;
+
+	uvm_lock_fpageq();
+	TAILQ_FOREACH(pmr, &uvm.pmr_control.use, pmr_use) {
+		/* Zero single pages. */
+		while ((pg = TAILQ_FIRST(&pmr->single[UVM_PMR_MEMTYPE_DIRTY]))
+		    != NULL) {
+			uvm_pmr_remove(pmr, pg);
+			uvm_pagezero(pg);
+			atomic_setbits_int(&pg->pg_flags, PG_ZERO);
+			uvmexp.zeropages++;
+			uvm_pmr_insert(pmr, pg, 0);
+		}
+
+		/* Zero multi page ranges. */
+		while ((pg = RB_ROOT(&pmr->size[UVM_PMR_MEMTYPE_DIRTY]))
+		    != NULL) {
+			pg--; /* Size tree always has second page. */
+			uvm_pmr_remove(pmr, pg);
+			for (i = 0; i < pg->fpgsz; i++) {
+				uvm_pagezero(&pg[i]);
+				atomic_setbits_int(&pg[i].pg_flags, PG_ZERO);
+				uvmexp.zeropages++;
+			}
+			uvm_pmr_insert(pmr, pg, 0);
+		}
+	}
+	uvm_unlock_fpageq();
+}