134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/*
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* Copyright (c) 1997, 1998 John S. Dyson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Absolutely no warranty of function or purpose is made by the author
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* John S. Dyson.
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*
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* $Id: vm_zone.c,v 1.20 1998/04/15 17:47:40 bde Exp $
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*/
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#if !defined(_SYS_ZONE_H)
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#define _SYS_ZONE_H
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#define ZONE_INTERRUPT 1 /* Use this if you need to allocate at int time */
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#define ZONE_BOOT 16 /* This is an internal flag used by zbootinit */
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#include <machine/lock.h>
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typedef struct vm_zone {
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struct simplelock zlock; /* lock for data structure */
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void *zitems; /* linked list of items */
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int zfreecnt; /* free entries */
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int zfreemin; /* minimum number of free entries */
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int znalloc; /* number of allocations */
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vm_offset_t zkva; /* Base kva of zone */
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int zpagecount; /* Total # of allocated pages */
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int zpagemax; /* Max address space */
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int zmax; /* Max number of entries allocated */
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int ztotal; /* Total entries allocated now */
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int zsize; /* size of each entry */
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int zalloc; /* hint for # of pages to alloc */
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int zflags; /* flags for zone */
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int zallocflag; /* flag for allocation */
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struct vm_object *zobj; /* object to hold zone */
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char *zname; /* name for diags */
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struct vm_zone *znext; /* list of zones for sysctl */
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} *vm_zone_t;
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void zerror __P((int)) __dead2;
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vm_zone_t zinit __P((char *name, int size, int nentries, int flags,
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int zalloc));
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int zinitna __P((vm_zone_t z, struct vm_object *obj, char *name,
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int size, int nentries, int flags, int zalloc));
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static void * zalloc __P((vm_zone_t z));
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static void zfree __P((vm_zone_t z, void *item));
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void * zalloci __P((vm_zone_t z));
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void zfreei __P((vm_zone_t z, void *item));
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void zbootinit __P((vm_zone_t z, char *name, int size, void *item,
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int nitems));
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void * _zget __P((vm_zone_t z));
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#define ZONE_ERROR_INVALID 0
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#define ZONE_ERROR_NOTFREE 1
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#define ZONE_ERROR_ALREADYFREE 2
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#define ZONE_ROUNDING 32
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#define ZENTRY_FREE 0x12342378
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/*
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* void *zalloc(vm_zone_t zone) --
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* Returns an item from a specified zone.
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*
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* void zfree(vm_zone_t zone, void *item) --
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* Frees an item back to a specified zone.
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*/
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static __inline__ void *
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_zalloc(vm_zone_t z)
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{
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void *item;
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#if defined(DIAGNOSTIC)
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if (z == 0)
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zerror(ZONE_ERROR_INVALID);
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#endif
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if (z->zfreecnt <= z->zfreemin)
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return _zget(z);
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item = z->zitems;
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z->zitems = ((void **) item)[0];
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#if defined(DIAGNOSTIC)
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if (((void **) item)[1] != (void *) ZENTRY_FREE)
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zerror(ZONE_ERROR_NOTFREE);
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((void **) item)[1] = 0;
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#endif
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z->zfreecnt--;
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z->znalloc++;
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return item;
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}
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static __inline__ void
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_zfree(vm_zone_t z, void *item)
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{
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((void **) item)[0] = z->zitems;
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#if defined(DIAGNOSTIC)
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if (((void **) item)[1] == (void *) ZENTRY_FREE)
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zerror(ZONE_ERROR_ALREADYFREE);
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((void **) item)[1] = (void *) ZENTRY_FREE;
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#endif
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z->zitems = item;
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z->zfreecnt++;
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}
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static __inline__ void *
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zalloc(vm_zone_t z)
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{
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#if defined(SMP)
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return zalloci(z);
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#else
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return _zalloc(z);
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#endif
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}
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static __inline__ void
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zfree(vm_zone_t z, void *item)
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{
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#if defined(SMP)
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zfreei(z, item);
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#else
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_zfree(z, item);
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#endif
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}
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#endif
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