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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #ifndef _SYS_VMEM_H
     27 #define	_SYS_VMEM_H
     28 
     29 #include <sys/types.h>
     30 
     31 #ifdef	__cplusplus
     32 extern "C" {
     33 #endif
     34 
     35 
     36 /*
     37  * Per-allocation flags
     38  */
     39 #define	VM_SLEEP	0x00000000	/* same as KM_SLEEP */
     40 #define	VM_NOSLEEP	0x00000001	/* same as KM_NOSLEEP */
     41 #define	VM_PANIC	0x00000002	/* same as KM_PANIC */
     42 #define	VM_PUSHPAGE	0x00000004	/* same as KM_PUSHPAGE */
     43 #define	VM_KMFLAGS	0x000000ff	/* flags that must match KM_* flags */
     44 
     45 #define	VM_BESTFIT	0x00000100
     46 #define	VM_FIRSTFIT	0x00000200
     47 #define	VM_NEXTFIT	0x00000400
     48 
     49 /*
     50  * The following flags are restricted for use only within the kernel.
     51  * VM_MEMLOAD is for use by the HAT to avoid infinite recursion.
     52  * VM_NORELOC is used by the kernel when static VA->PA mappings are required.
     53  */
     54 #define	VM_MEMLOAD	0x00000800
     55 #define	VM_NORELOC	0x00001000
     56 /*
     57  * VM_ABORT requests that vmem_alloc() *ignore* the VM_SLEEP/VM_NOSLEEP flags
     58  * and forgo reaping if the allocation or attempted import, fails.  This
     59  * flag is a segkmem-specific flag, and should not be used by anyone else.
     60  */
     61 #define	VM_ABORT	0x00002000
     62 
     63 /*
     64  * VM_ENDALLOC requests that large addresses be preferred in allocations.
     65  * Has no effect if VM_NEXTFIT is active.
     66  */
     67 #define	VM_ENDALLOC	0x00004000
     68 
     69 #define	VM_FLAGS	0x0000FFFF
     70 
     71 /*
     72  * Arena creation flags
     73  */
     74 #define	VMC_POPULATOR	0x00010000
     75 #define	VMC_NO_QCACHE	0x00020000	/* cannot use quantum caches */
     76 #define	VMC_IDENTIFIER	0x00040000	/* not backed by memory */
     77 /*
     78  * internal use only;	the import function uses the vmem_ximport_t interface
     79  *			and may increase the request size if it so desires.
     80  *			VMC_XALIGN, for use with vmem_xcreate, specifies that
     81  *			the address returned by the import function will be
     82  *			aligned according to the alignment argument.
     83  */
     84 #define	VMC_XALLOC	0x00080000
     85 #define	VMC_XALIGN	0x00100000
     86 #define	VMC_FLAGS	0xFFFF0000
     87 
     88 /*
     89  * Public segment types
     90  */
     91 #define	VMEM_ALLOC	0x01
     92 #define	VMEM_FREE	0x02
     93 
     94 /*
     95  * Implementation-private segment types
     96  */
     97 #define	VMEM_SPAN	0x10
     98 #define	VMEM_ROTOR	0x20
     99 #define	VMEM_WALKER	0x40
    100 
    101 /*
    102  * VMEM_REENTRANT indicates to vmem_walk() that the callback routine may
    103  * call back into the arena being walked, so vmem_walk() must drop the
    104  * arena lock before each callback.  The caveat is that since the arena
    105  * isn't locked, its state can change.  Therefore it is up to the callback
    106  * routine to handle cases where the segment isn't of the expected type.
    107  * For example, we use this to walk heap_arena when generating a crash dump;
    108  * see segkmem_dump() for sample usage.
    109  */
    110 #define	VMEM_REENTRANT	0x80000000
    111 
    112 typedef struct vmem vmem_t;
    113 typedef void *(vmem_alloc_t)(vmem_t *, size_t, int);
    114 typedef void (vmem_free_t)(vmem_t *, void *, size_t);
    115 
    116 /*
    117  * Alternate import style; the requested size is passed in a pointer,
    118  * which can be increased by the import function if desired.
    119  */
    120 typedef void *(vmem_ximport_t)(vmem_t *, size_t *, size_t, int);
    121 
    122 #ifdef _KERNEL
    123 extern vmem_t *vmem_init(const char *, void *, size_t, size_t,
    124     vmem_alloc_t *, vmem_free_t *);
    125 extern void vmem_update(void *);
    126 extern int vmem_is_populator();
    127 extern size_t vmem_seg_size;
    128 #endif
    129 
    130 extern vmem_t *vmem_create(const char *, void *, size_t, size_t,
    131     vmem_alloc_t *, vmem_free_t *, vmem_t *, size_t, int);
    132 extern vmem_t *vmem_xcreate(const char *, void *, size_t, size_t,
    133     vmem_ximport_t *, vmem_free_t *, vmem_t *, size_t, int);
    134 extern void vmem_destroy(vmem_t *);
    135 extern void *vmem_alloc(vmem_t *, size_t, int);
    136 extern void *vmem_xalloc(vmem_t *, size_t, size_t, size_t, size_t,
    137     void *, void *, int);
    138 extern void vmem_free(vmem_t *, void *, size_t);
    139 extern void vmem_xfree(vmem_t *, void *, size_t);
    140 extern void *vmem_add(vmem_t *, void *, size_t, int);
    141 extern int vmem_contains(vmem_t *, void *, size_t);
    142 extern void vmem_walk(vmem_t *, int, void (*)(void *, void *, size_t), void *);
    143 extern size_t vmem_size(vmem_t *, int);
    144 
    145 #ifdef	__cplusplus
    146 }
    147 #endif
    148 
    149 #endif	/* _SYS_VMEM_H */
    150