vmem.h

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/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_VMEM_H
#define _SYS_VMEM_H

/* #pragma ident        "@(#)vmem.h     1.13    05/06/08 SMI" */

#include <sys/types.h>

#ifdef  __cplusplus
extern "C" {
#endif


/*
 * Per-allocation flags
 */
#define VM_SLEEP        0x00000000      /* same as KM_SLEEP */
#define VM_NOSLEEP      0x00000001      /* same as KM_NOSLEEP */
#define VM_PANIC        0x00000002      /* same as KM_PANIC */
#define VM_PUSHPAGE     0x00000004      /* same as KM_PUSHPAGE */
#define VM_KMFLAGS      0x000000ff      /* flags that must match KM_* flags */

#define VM_BESTFIT      0x00000100
#define VM_FIRSTFIT     0x00000200
#define VM_NEXTFIT      0x00000400

/*
 * The following flags are restricted for use only within the kernel.
 * VM_MEMLOAD is for use by the HAT to avoid infinite recursion.
 * VM_NORELOC is used by the kernel when static VA->PA mappings are required.
 */
#define VM_MEMLOAD      0x00000800
#define VM_NORELOC      0x00001000
/*
 * VM_ABORT requests that vmem_alloc() *ignore* the VM_SLEEP/VM_NOSLEEP flags
 * and forgo reaping if the allocation or attempted import, fails.  This
 * flag is a segkmem-specific flag, and should not be used by anyone else.
 */
#define VM_ABORT        0x00002000

#define VM_FLAGS        0x0000FFFF

/*
 * Arena creation flags
 */
#define VMC_POPULATOR   0x00010000
#define VMC_NO_QCACHE   0x00020000      /* cannot use quantum caches */
#define VMC_IDENTIFIER  0x00040000      /* not backed by memory */
/*
 * internal use only;   the import function uses the vmem_ximport_t interface
 *                      and may increase the request size if it so desires
 */
#define VMC_XALLOC      0x00080000
#define VMC_FLAGS       0xFFFF0000

/*
 * Public segment types
 */
#define VMEM_ALLOC      0x01
#define VMEM_FREE       0x02

/*
 * Implementation-private segment types
 */
#define VMEM_SPAN       0x10
#define VMEM_ROTOR      0x20
#define VMEM_WALKER     0x40

/*
 * VMEM_REENTRANT indicates to vmem_walk() that the callback routine may
 * call back into the arena being walked, so vmem_walk() must drop the
 * arena lock before each callback.  The caveat is that since the arena
 * isn't locked, its state can change.  Therefore it is up to the callback
 * routine to handle cases where the segment isn't of the expected type.
 * For example, we use this to walk heap_arena when generating a crash dump;
 * see segkmem_dump() for sample usage.
 */
#define VMEM_REENTRANT  0x80000000

typedef struct vmem vmem_t;
typedef void *(vmem_alloc_t)(vmem_t *, size_t, int);
typedef void (vmem_free_t)(vmem_t *, void *, size_t);

/*
 * Alternate import style; the requested size is passed in a pointer,
 * which can be increased by the import function if desired.
 */
typedef void *(vmem_ximport_t)(vmem_t *, size_t *, int);

#ifdef _KERNEL
extern vmem_t *vmem_init(const char *, void *, size_t, size_t,
    vmem_alloc_t *, vmem_free_t *);
extern void vmem_update(void *);
extern int vmem_is_populator();
extern size_t vmem_seg_size;
#endif

extern vmem_t *vmem_create(const char *, void *, size_t, size_t,
    vmem_alloc_t *, vmem_free_t *, vmem_t *, size_t, int);
extern vmem_t *vmem_xcreate(const char *, void *, size_t, size_t,
    vmem_ximport_t *, vmem_free_t *, vmem_t *, size_t, int);
extern void vmem_destroy(vmem_t *);
extern void *vmem_alloc(vmem_t *, size_t, int);
extern void *vmem_xalloc(vmem_t *, size_t, size_t, size_t, size_t,
    void *, void *, int);
extern void vmem_free(vmem_t *, void *, size_t);
extern void vmem_xfree(vmem_t *, void *, size_t);
extern void *vmem_add(vmem_t *, void *, size_t, int);
extern int vmem_contains(vmem_t *, void *, size_t);
extern void vmem_walk(vmem_t *, int, void (*)(void *, void *, size_t), void *);
extern size_t vmem_size(vmem_t *, int);

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_VMEM_H */