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/*
* Copyright (c) 1997 John S. Dyson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice immediately at the beginning of the file, without modification,
* this list of conditions, and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Absolutely no warranty of function or purpose is made by the author
* John S. Dyson.
* 4. This work was done expressly for inclusion into FreeBSD. Other use
* is allowed if this notation is included.
* 5. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: vm_zone.h,v 1.4 1997/08/07 03:52:55 dyson Exp $
*/
#if !defined(_SYS_ZONE_H)
#define _SYS_ZONE_H
#define ZONE_INTERRUPT 1 /* Use this if you need to allocate at int time */
#define ZONE_BOOT 16 /* This is an internal flag used by zbootinit */
#include <machine/param.h>
#include <sys/lock.h>
typedef struct vm_zone {
struct simplelock zlock; /* lock for data structure */
void *zitems; /* linked list of items */
int zfreecnt; /* free entries */
int zfreemin; /* minimum number of free entries */
int znalloc; /* number of allocations */
vm_offset_t zkva; /* Base kva of zone */
int zpagecount; /* Total # of allocated pages */
int zpagemax; /* Max address space */
int zmax; /* Max number of entries allocated */
int ztotal; /* Total entries allocated now */
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 */
struct vm_zone *znext; /* list of zones for sysctl */
} *vm_zone_t;
vm_zone_t zinit __P((char *name, int size, int nentries, int flags, int zalloc));
int zinitna __P((vm_zone_t z, struct vm_object *obj, char *name, int size,
int nentries, int flags, int zalloc));
static void * zalloc __P((vm_zone_t z));
static void zfree __P((vm_zone_t z, void *item));
void * zalloci __P((vm_zone_t z));
void zfreei __P((vm_zone_t z, void *item));
void zbootinit __P((vm_zone_t z, char *name, int size, void *item, int nitems));
void * _zget __P((vm_zone_t z));
/*
* void *zalloc(vm_zone_t zone) --
* Returns an item from a specified zone.
*
* void zfree(vm_zone_t zone, void *item) --
* Frees an item back to a specified zone.
*/
static __inline__ void *
_zalloc(vm_zone_t z) {
void *item;
if (z->zfreecnt <= z->zfreemin) {
return _zget(z);
}
item = z->zitems;
z->zitems = *(void **) item;
z->zfreecnt--;
z->znalloc++;
return item;
}
static __inline__ void
_zfree(vm_zone_t z, void *item) {
* (void **) item = z->zitems;
z->zitems = item;
z->zfreecnt++;
}
static __inline__ void *
zalloc(vm_zone_t z) {
#if NCPU > 1
return zalloci(z);
#else
return _zalloc(z);
#endif
}
static __inline__ void
zfree(vm_zone_t z, void *item) {
#if NCPU > 1
zfreei(z, item);
#else
_zfree(z, item);
#endif
}
#endif
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