/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_SHM_IMPL_H
#define _SYS_SHM_IMPL_H

#include <sys/ipc_impl.h>
#if defined(_KERNEL) || defined(_KMEMUSER)
#include <sys/shm.h>
#include <sys/avl.h>
#include <sys/t_lock.h>
#endif

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * shmsys system call subcodes
 */
#define SHMAT   0
#define SHMCTL  1
#define SHMDT   2
#define SHMGET  3
#define SHMIDS  4

/*
 *      There is a shared mem id data structure (shmid_ds) for each
 *      segment in the system.
 */
#if defined(_KERNEL) || defined(_KMEMUSER)
typedef struct kshmid {
        kipc_perm_t     shm_perm;       /* operation permission struct */
        size_t          shm_segsz;      /* size of segment in bytes */
        struct anon_map *shm_amp;       /* segment anon_map pointer */
        ushort_t        shm_lkcnt;      /* number of times it is being locked */
        pgcnt_t         shm_lkpages;    /* number of pages locked by shmctl */
        kmutex_t        shm_mlock;      /* held when locking physical pages */
                                        /* Therefore, protects p_lckcnt for */
                                        /* pages that back shm */
        pid_t           shm_lpid;       /* pid of last shmop */
        pid_t           shm_cpid;       /* pid of creator */
        ulong_t         shm_ismattch;   /* number of ISM attaches */
        time_t          shm_atime;      /* last shmat time */
        time_t          shm_dtime;      /* last shmdt time */
        time_t          shm_ctime;      /* last change time */
        struct sptinfo  *shm_sptinfo;   /* info about ISM segment */
        struct seg      *shm_sptseg;    /* pointer to ISM segment */
        long            shm_sptprot;    /* was reserved (still a "long") */
} kshmid_t;

/*
 *      Segacct Flags.
 */
#define SHMSA_ISM       1       /* uses shared page table */

typedef struct sptinfo {
        struct as       *sptas;         /* dummy as ptr. for spt segment */
} sptinfo_t;

/*
 * Protected by p->p_lock
 */
typedef struct segacct {
        avl_node_t      sa_tree;
        caddr_t         sa_addr;
        size_t          sa_len;
        ulong_t         sa_flags;
        kshmid_t        *sa_id;
} segacct_t;

/*
 * Error codes for shmgetid().
 */
#define SHMID_NONE      (-1)
#define SHMID_FREE      (-2)

extern void shminit(void);
extern void shmfork(struct proc *, struct proc *);
extern void shmexit(struct proc *);
extern int shmgetid(struct proc *, caddr_t);

#endif  /* _KERNEL */

#if defined(_SYSCALL32)
/*
 * LP64 view of the ILP32 shmid_ds structure
 */
struct shmid_ds32 {
        struct ipc_perm32 shm_perm;     /* operation permission struct */
        size32_t        shm_segsz;      /* size of segment in bytes */
        caddr32_t       shm_amp;        /* segment anon_map pointer */
        uint16_t        shm_lkcnt;      /* number of times it is being locked */
        pid32_t         shm_lpid;       /* pid of last shmop */
        pid32_t         shm_cpid;       /* pid of creator */
        uint32_t        shm_nattch;     /* number of attaches */
        uint32_t        shm_cnattch;    /* number of ISM attaches */
        time32_t        shm_atime;      /* last shmat time */
        int32_t         shm_pad1;       /* reserved for time_t expansion */
        time32_t        shm_dtime;      /* last shmdt time */
        int32_t         shm_pad2;       /* reserved for time_t expansion */
        time32_t        shm_ctime;      /* last change time */
        int32_t         shm_pad3;       /* reserved for time_t expansion */
        int32_t         shm_pad4[4];    /* reserve area  */
};
#endif

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_SHM_IMPL_H */