/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __ASM_GENERIC_SHMBUF_H
#define __ASM_GENERIC_SHMBUF_H

#include <asm/bitsperlong.h>
#include <asm/ipcbuf.h>
#include <asm/posix_types.h>

/*
 * The shmid64_ds structure for x86 architecture.
 * Note extra padding because this structure is passed back and forth
 * between kernel and user space.
 *
 * shmid64_ds was originally meant to be architecture specific, but
 * everyone just ended up making identical copies without specific
 * optimizations, so we may just as well all use the same one.
 *
 * 64 bit architectures use a 64-bit long time field here, while
 * 32 bit architectures have a pair of unsigned long values.
 * On big-endian systems, the lower half is in the wrong place.
 *
 *
 * Pad space is left for:
 * - 2 miscellaneous 32-bit values
 */

struct shmid64_ds {
        struct ipc64_perm       shm_perm;       /* operation perms */
        __kernel_size_t         shm_segsz;      /* size of segment (bytes) */
#if __BITS_PER_LONG == 64
        long                    shm_atime;      /* last attach time */
        long                    shm_dtime;      /* last detach time */
        long                    shm_ctime;      /* last change time */
#else
        unsigned long           shm_atime;      /* last attach time */
        unsigned long           shm_atime_high;
        unsigned long           shm_dtime;      /* last detach time */
        unsigned long           shm_dtime_high;
        unsigned long           shm_ctime;      /* last change time */
        unsigned long           shm_ctime_high;
#endif
        __kernel_pid_t          shm_cpid;       /* pid of creator */
        __kernel_pid_t          shm_lpid;       /* pid of last operator */
        unsigned long           shm_nattch;     /* no. of current attaches */
        unsigned long           __unused4;
        unsigned long           __unused5;
};

struct shminfo64 {
        unsigned long           shmmax;
        unsigned long           shmmin;
        unsigned long           shmmni;
        unsigned long           shmseg;
        unsigned long           shmall;
        unsigned long           __unused1;
        unsigned long           __unused2;
        unsigned long           __unused3;
        unsigned long           __unused4;
};

#endif /* __ASM_GENERIC_SHMBUF_H */