Move uvm_pmr_alloc_pig to kern/subr_hibernate.c

No callers, no functional change.

1 files changed, 45 insertions, 1 deletions

diff --git a/sys/kern/subr_hibernate.c b/sys/kern/subr_hibernate.c
index f9159b5853e..b071538a289 100644
--- a/sys/kern/subr_hibernate.c
+++ b/sys/kern/subr_hibernate.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: subr_hibernate.c,v 1.2 2011/07/08 18:20:10 ariane Exp $	*/
+/*	$OpenBSD: subr_hibernate.c,v 1.3 2011/07/08 18:25:56 ariane Exp $	*/
 
 /*
  * Copyright (c) 2011 Ariane van der Steldt <ariane@stack.nl>
@@ -262,3 +262,47 @@ uvm_pmr_zero_everything(void)
 	}
 	uvm_unlock_fpageq();
 }
+
+/*
+ * Allocate the biggest contig chunk of memory.
+ */
+int
+uvm_pmr_alloc_pig(paddr_t *addr, psize_t *sz)
+{
+	struct uvm_pmemrange	*pig_pmr, *pmr;
+	struct vm_page		*pig_pg, *pg;
+	int			 memtype;
+
+	uvm_lock_fpageq();
+	pig_pg = NULL;
+	TAILQ_FOREACH(pmr, &uvm.pmr_control.use, pmr_use) {
+		for (memtype = 0; memtype < UVM_PMR_MEMTYPE_MAX; memtype++) {
+			/* Find biggest page in this memtype pmr. */
+			pg = RB_MAX(uvm_pmr_size, &pmr->size[memtype]);
+			if (pg == NULL)
+				pg = TAILQ_FIRST(&pmr->single[memtype]);
+			else
+				pg--;
+
+			if (pig_pg == NULL || (pg != NULL && pig_pg != NULL &&
+			    pig_pg->fpgsz < pg->fpgsz)) {
+				pig_pmr = pmr;
+				pig_pg = pg;
+			}
+		}
+	}
+
+	/* Remove page from freelist. */
+	if (pig_pg != NULL) {
+		uvm_pmr_remove(pig_pmr, pig_pg);
+		uvmexp.free -= pig_pg->fpgsz;
+		if (pig_pg->pg_flags & PG_ZERO)
+			uvmexp.zeropages -= pig_pg->fpgsz;
+		*addr = VM_PAGE_TO_PHYS(pig_pg);
+		*sz = pig_pg->fpgsz;
+	}
+	uvm_unlock_fpageq();
+
+	/* Return. */
+	return (pig_pg != NULL ? 0 : ENOMEM);
+}