/*
* Copyright (c) 1997, 1998 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. Absolutely no warranty of function or purpose is made by the author
* John S. Dyson.
*
* $FreeBSD$
*/
#ifndef _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/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;
void zerror __P((int)) __dead2;
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));
#define ZONE_ERROR_INVALID 0
#define ZONE_ERROR_NOTFREE 1
#define ZONE_ERROR_ALREADYFREE 2
#define ZONE_ROUNDING 32
#define ZENTRY_FREE 0x12342378
/*
* 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;
#ifdef INVARIANTS
if (z == 0)
zerror(ZONE_ERROR_INVALID);
#endif
if (z->zfreecnt <= z->zfreemin)
return _zget(z);
item = z->zitems;
z->zitems = ((void **) item)[0];
#ifdef INVARIANTS
if (((void **) item)[1] != (void *) ZENTRY_FREE)
zerror(ZONE_ERROR_NOTFREE);
((void **) item)[1] = 0;
#endif
z->zfreecnt--;
z->znalloc++;
return item;
}
static __inline__ void
_zfree(vm_zone_t z, void *item)
{
((void **) item)[0] = z->zitems;
#ifdef INVARIANTS
if (((void **) item)[1] == (void *) ZENTRY_FREE)
zerror(ZONE_ERROR_ALREADYFREE);
((void **) item)[1] = (void *) ZENTRY_FREE;
#endif
z->zitems = item;
z->zfreecnt++;
}
static __inline__ void *
zalloc(vm_zone_t z)
{
#if defined(SMP)
return zalloci(z);
#else
return _zalloc(z);
#endif
}
static __inline__ void
zfree(vm_zone_t z, void *item)
{
#ifdef SMP
zfreei(z, item);
#else
_zfree(z, item);
#endif
}
#endif
