A very simple zone allocator.

1 files changed, 82 insertions, 0 deletions

diff --git a/sys/vm/vm_zone.h b/sys/vm/vm_zone.h
new file mode 100644
index 0000000..7f6630d
--- /dev/null
+++ b/sys/vm/vm_zone.h
@@ -0,0 +1,82 @@
+
+#if !defined(_SYS_ZONE_H)
+
+#define _SYS_ZONE_H
+
+#define ZONE_COLOR 1
+#define ZONE_INTERRUPT 2
+#define ZONE_WAIT 4
+#define ZONE_PREALLOCATE 8
+#define ZONE_BOOT 16
+
+#include	<machine/param.h>
+#include	<sys/lock.h>
+
+
+#define CACHE_LINE_SIZE 32
+
+typedef struct vm_zone {
+	struct	simplelock		zlock;			/* lock for data structure */
+	void					*zitems;		/* linked list of items */
+	int						zfreemin;		/* minimum number of free entries */
+	int						zfreecnt;		/* free entries */
+	vm_offset_t				zkva;			/* Base kva of zone */
+	int						zpagecount;		/* Total # of allocated pages */
+	int						zpagemax;		/* Max address space */
+	int						zsize;			/* size of each entry */
+	int						zalloc;			/* hint for # of pages to alloc */
+	int						zflags;			/* flags for zone */
+	int						zallocflag;		/* flag for allocation */
+	struct	vm_object		*zobj;			/* object to hold zone */
+	char					*zname;			/* name for diags */
+} *vm_zone_t;
+
+
+vm_zone_t zinit(char *name, int size, int nentries, int flags, int zalloc);
+int _zinit(vm_zone_t z, struct vm_object *obj, char *name, int size,
+		int nentries, int flags, int zalloc);
+static void * zalloc(vm_zone_t z);
+static void zfree(vm_zone_t z, void *item);
+void * zalloci(vm_zone_t z) __attribute__((regparm(1)));
+void zfreei(vm_zone_t z, void *item) __attribute__((regparm(2)));
+void _zbootinit(vm_zone_t z, char *name, int size, void *item, int nitems) ;
+void * zget(vm_zone_t z, int s) __attribute__((regparm(2)));
+
+#if SMP > 1
+
+static __inline__ void *
+zalloc(vm_zone_t z) {
+	return zalloci(z);
+}
+
+static __inline__ void
+zfree(vm_zone_t z, void *item) {
+	zfreei(z, item);
+}
+
+#else
+
+static __inline__ void *
+zalloc(vm_zone_t z) {
+	int s;
+	void *item;
+
+	if (z->zfreecnt <= z->zfreemin) {
+		return zget(z, s);
+	}
+	
+	item = z->zitems;
+	z->zitems = *(void **) item;
+	--z->zfreecnt;
+	return item;
+}
+
+static __inline__ void
+zfree(vm_zone_t z, void *item) {
+	* (void **) item = z->zitems;
+	z->zitems = item;
+	++z->zfreecnt;
+}
+#endif
+
+#endif