436 lines
15 KiB
C
436 lines
15 KiB
C
/* $OpenBSD: systm.h,v 1.170 2023/10/30 07:04:36 claudio Exp $ */
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/* $NetBSD: systm.h,v 1.50 1996/06/09 04:55:09 briggs Exp $ */
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/*-
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* Copyright (c) 1982, 1988, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)systm.h 8.4 (Berkeley) 2/23/94
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*/
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#ifndef __SYSTM_H__
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#define __SYSTM_H__
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#include <sys/queue.h>
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#include <sys/stdarg.h>
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/*
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* The `securelevel' variable controls the security level of the system.
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* It can only be decreased by process 1 (/sbin/init).
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*
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* Security levels are as follows:
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* -1 permanently insecure mode - always run system in level 0 mode.
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* 0 insecure mode - immutable and append-only flags may be turned off.
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* All devices may be read or written subject to permission modes.
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* 1 secure mode - immutable and append-only flags may not be changed;
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* raw disks of mounted filesystems, /dev/mem, and /dev/kmem are
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* read-only.
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* 2 highly secure mode - same as (1) plus raw disks are always
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* read-only whether mounted or not. This level precludes tampering
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* with filesystems by unmounting them, but also inhibits running
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* newfs while the system is secured.
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*
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* In normal operation, the system runs in level 0 mode while single user
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* and in level 1 mode while multiuser. If level 2 mode is desired while
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* running multiuser, it can be set in the multiuser startup script
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* (/etc/rc.local) using sysctl(1). If it is desired to run the system
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* in level 0 mode while multiuser, initialize the variable securelevel
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* in /sys/kern/kern_sysctl.c to -1. Note that it is NOT initialized to
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* zero as that would allow the vmunix binary to be patched to -1.
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* Without initialization, securelevel loads in the BSS area which only
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* comes into existence when the kernel is loaded and hence cannot be
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* patched by a stalking hacker.
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*/
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extern int securelevel; /* system security level */
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extern const char *panicstr; /* panic message */
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extern const char version[]; /* system version */
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extern const char copyright[]; /* system copyright */
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extern const char ostype[];
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extern const char osversion[];
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extern const char osrelease[];
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extern int cold; /* cold start flag initialized in locore */
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extern int db_active; /* running currently inside ddb(4) */
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extern char *hw_vendor; /* sysctl hw.vendor */
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extern char *hw_prod; /* sysctl hw.product */
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extern char *hw_uuid; /* sysctl hw.uuid */
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extern char *hw_serial; /* sysctl hw.serialno */
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extern char *hw_ver; /* sysctl hw.version */
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extern int ncpus; /* number of CPUs used */
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extern int ncpusfound; /* number of CPUs found */
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extern int nblkdev; /* number of entries in bdevsw */
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extern int nchrdev; /* number of entries in cdevsw */
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extern int maxmem; /* max memory per process */
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extern int physmem; /* physical memory */
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extern dev_t dumpdev; /* dump device */
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extern long dumplo; /* offset into dumpdev */
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extern dev_t rootdev; /* root device */
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extern u_char bootduid[8]; /* boot device disklabel uid */
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extern u_char rootduid[8]; /* root device disklabel uid */
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extern struct vnode *rootvp; /* vnode equivalent to above */
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extern struct device *rootdv; /* device equivalent to above */
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extern dev_t swapdev; /* swapping device */
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extern struct vnode *swapdev_vp;/* vnode equivalent to above */
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extern int nowake; /* dead wakeup(9) channel */
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struct proc;
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struct process;
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#define curproc curcpu()->ci_curproc
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typedef int sy_call_t(struct proc *, void *, register_t *);
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extern const struct sysent { /* system call table */
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short sy_narg; /* number of args */
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short sy_argsize; /* total size of arguments */
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int sy_flags;
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sy_call_t *sy_call; /* implementing function */
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} sysent[];
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#define SY_NOLOCK 0x01
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#if _BYTE_ORDER == _BIG_ENDIAN
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#define SCARG(p, k) ((p)->k.be.datum) /* get arg from args pointer */
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#elif _BYTE_ORDER == _LITTLE_ENDIAN
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#define SCARG(p, k) ((p)->k.le.datum) /* get arg from args pointer */
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#else
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#error "what byte order is this machine?"
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#endif
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#if defined(_KERNEL) && defined(SYSCALL_DEBUG)
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void scdebug_call(struct proc *p, register_t code, const register_t retval[]);
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void scdebug_ret(struct proc *p, register_t code, int error,
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const register_t retval[]);
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#endif /* _KERNEL && SYSCALL_DEBUG */
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extern int boothowto; /* reboot flags, from console subsystem */
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extern void (*v_putc)(int); /* Virtual console putc routine */
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/*
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* General function declarations.
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*/
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int nullop(void *);
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int enodev(void);
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int enosys(void);
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int enoioctl(void);
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int enxio(void);
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int eopnotsupp(void *);
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void *hashinit(int, int, int, u_long *);
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void hashfree(void *, int, int);
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int sys_nosys(struct proc *, void *, register_t *);
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void panic(const char *, ...)
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__attribute__((__noreturn__,__format__(__kprintf__,1,2)));
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void __assert(const char *, const char *, int, const char *)
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__attribute__((__noreturn__));
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int printf(const char *, ...)
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__attribute__((__format__(__kprintf__,1,2)));
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void uprintf(const char *, ...)
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__attribute__((__format__(__kprintf__,1,2)));
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int vprintf(const char *, va_list)
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__attribute__((__format__(__kprintf__,1,0)));
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int vsnprintf(char *, size_t, const char *, va_list)
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__attribute__((__format__(__kprintf__,3,0)));
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int snprintf(char *buf, size_t, const char *, ...)
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__attribute__((__format__(__kprintf__,3,4)));
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struct tty;
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void ttyprintf(struct tty *, const char *, ...)
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__attribute__((__format__(__kprintf__,2,3)));
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void splassert_fail(int, int, const char *);
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extern int splassert_ctl;
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void assertwaitok(void);
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void tablefull(const char *);
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int kcopy(const void *, void *, size_t)
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__attribute__ ((__bounded__(__buffer__,1,3)))
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__attribute__ ((__bounded__(__buffer__,2,3)));
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void bcopy(const void *, void *, size_t)
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__attribute__ ((__bounded__(__buffer__,1,3)))
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__attribute__ ((__bounded__(__buffer__,2,3)));
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void bzero(void *, size_t)
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__attribute__ ((__bounded__(__buffer__,1,2)));
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void explicit_bzero(void *, size_t)
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__attribute__ ((__bounded__(__buffer__,1,2)));
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int bcmp(const void *, const void *, size_t);
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void *memcpy(void *, const void *, size_t)
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__attribute__ ((__bounded__(__buffer__,1,3)))
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__attribute__ ((__bounded__(__buffer__,2,3)));
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void *memmove(void *, const void *, size_t)
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__attribute__ ((__bounded__(__buffer__,1,3)))
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__attribute__ ((__bounded__(__buffer__,2,3)));
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void *memset(void *, int, size_t)
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__attribute__ ((__bounded__(__buffer__,1,3)));
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int copyinstr(const void *, void *, size_t, size_t *)
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__attribute__ ((__bounded__(__string__,2,3)));
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int _copyinstr(const void *, void *, size_t, size_t *)
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__attribute__ ((__bounded__(__string__,2,3)));
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int copyoutstr(const void *, void *, size_t, size_t *);
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int copyin(const void *, void *, size_t)
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__attribute__ ((__bounded__(__buffer__,2,3)));
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int _copyin(const void *, void *, size_t)
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__attribute__ ((__bounded__(__buffer__,2,3)));
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int copyout(const void *, void *, size_t);
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int copyin32(const uint32_t *, uint32_t *);
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void random_start(int);
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void enqueue_randomness(unsigned int);
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void suspend_randomness(void);
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void resume_randomness(char *, size_t);
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struct arc4random_ctx;
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void arc4random_buf(void *, size_t)
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__attribute__ ((__bounded__(__buffer__,1,2)));
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struct arc4random_ctx *arc4random_ctx_new(void);
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void arc4random_ctx_free(struct arc4random_ctx *);
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void arc4random_ctx_buf(struct arc4random_ctx *, void *, size_t);
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u_int32_t arc4random(void);
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u_int32_t arc4random_uniform(u_int32_t);
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struct timeval;
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struct timespec;
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int tvtohz(const struct timeval *);
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int tstohz(const struct timespec *);
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void realitexpire(void *);
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extern uint64_t hardclock_period;
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extern uint64_t statclock_avg;
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extern int statclock_is_randomized;
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struct clockframe;
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void hardclock(struct clockframe *);
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struct clockrequest;
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void statclock(struct clockrequest *, void *, void *);
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void initclocks(void);
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void inittodr(time_t);
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void resettodr(void);
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void cpu_initclocks(void);
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void cpu_startclock(void);
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void startprofclock(struct process *);
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void stopprofclock(struct process *);
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void setstatclockrate(int);
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void start_periodic_resettodr(void);
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void stop_periodic_resettodr(void);
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void sleep_setup(const volatile void *, int, const char *);
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int sleep_finish(int, int);
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void sleep_queue_init(void);
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struct cond;
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void cond_init(struct cond *);
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void cond_wait(struct cond *, const char *);
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void cond_signal(struct cond *);
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#define INFSLP UINT64_MAX
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#define MAXTSLP (UINT64_MAX - 1)
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struct mutex;
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struct rwlock;
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void wakeup_n(const volatile void *, int);
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void wakeup(const volatile void *);
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#define wakeup_one(c) wakeup_n((c), 1)
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int tsleep(const volatile void *, int, const char *, int);
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int tsleep_nsec(const volatile void *, int, const char *, uint64_t);
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int msleep(const volatile void *, struct mutex *, int, const char*, int);
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int msleep_nsec(const volatile void *, struct mutex *, int, const char*,
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uint64_t);
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int rwsleep(const volatile void *, struct rwlock *, int, const char *, int);
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int rwsleep_nsec(const volatile void *, struct rwlock *, int, const char *,
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uint64_t);
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void yield(void);
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void wdog_register(int (*)(void *, int), void *);
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void wdog_shutdown(void *);
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/*
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* Startup hooks are functions running after the scheduler has started
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* but before any threads have been created or root has been mounted.
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*/
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struct hook_desc {
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TAILQ_ENTRY(hook_desc) hd_list;
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void (*hd_fn)(void *);
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void *hd_arg;
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};
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TAILQ_HEAD(hook_desc_head, hook_desc);
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extern struct hook_desc_head startuphook_list;
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void *hook_establish(struct hook_desc_head *, int, void (*)(void *), void *);
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void hook_disestablish(struct hook_desc_head *, void *);
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void dohooks(struct hook_desc_head *, int);
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#define HOOK_REMOVE 0x01
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#define HOOK_FREE 0x02
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#define startuphook_establish(fn, arg) \
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hook_establish(&startuphook_list, 1, (fn), (arg))
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#define startuphook_disestablish(vhook) \
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hook_disestablish(&startuphook_list, (vhook))
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#define dostartuphooks() dohooks(&startuphook_list, HOOK_REMOVE|HOOK_FREE)
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struct uio;
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int uiomove(void *, size_t, struct uio *);
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#if defined(_KERNEL)
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#include <sys/rwlock.h>
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extern struct rwlock netlock;
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/*
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* Network stack data structures are, unless stated otherwise, protected
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* by the NET_LOCK(). It's a single non-recursive lock for the whole
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* subsystem.
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*/
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#define NET_LOCK() do { rw_enter_write(&netlock); } while (0)
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#define NET_UNLOCK() do { rw_exit_write(&netlock); } while (0)
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/*
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* Reader version of NET_LOCK().
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* The "softnet" thread should be the only thread processing packets
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* without holding an exclusive lock. This is done to allow read-only
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* ioctl(2) to not block.
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* Shared lock can be grabbed instead of the exclusive version if no field
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* protected by the NET_LOCK() is modified by the ioctl/sysctl.
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* Socket system call can use shared netlock if it has additional locks
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* to protect socket and pcb data structures.
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*/
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#define NET_LOCK_SHARED() do { rw_enter_read(&netlock); } while (0)
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#define NET_UNLOCK_SHARED() do { rw_exit_read(&netlock); } while (0)
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#ifdef DIAGNOSTIC
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#define NET_ASSERT_UNLOCKED() \
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do { \
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int _s = rw_status(&netlock); \
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if ((splassert_ctl > 0) && (_s == RW_WRITE)) \
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splassert_fail(0, RW_WRITE, __func__); \
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} while (0)
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#define NET_ASSERT_LOCKED() \
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do { \
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int _s = rw_status(&netlock); \
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if ((splassert_ctl > 0) && (_s != RW_WRITE && _s != RW_READ)) \
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splassert_fail(RW_READ, _s, __func__); \
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} while (0)
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#define NET_ASSERT_LOCKED_EXCLUSIVE() \
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do { \
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int _s = rw_status(&netlock); \
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if ((splassert_ctl > 0) && (_s != RW_WRITE)) \
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splassert_fail(RW_WRITE, _s, __func__); \
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} while (0)
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#else /* DIAGNOSTIC */
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#define NET_ASSERT_UNLOCKED() do {} while (0)
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#define NET_ASSERT_LOCKED() do {} while (0)
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#define NET_ASSERT_LOCKED_EXCLUSIVE() do {} while (0)
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#endif /* !DIAGNOSTIC */
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__returns_twice int setjmp(label_t *);
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__dead void longjmp(label_t *);
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#endif
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void consinit(void);
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void cpu_startup(void);
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void cpu_configure(void);
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void diskconf(void);
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int nfs_mountroot(void);
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int dk_mountroot(void);
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extern int (*mountroot)(void);
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#include <lib/libkern/libkern.h>
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#define bzero(b, n) __builtin_bzero((b), (n))
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#define memcmp(b1, b2, n) __builtin_memcmp((b1), (b2), (n))
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#define memcpy(d, s, n) __builtin_memcpy((d), (s), (n))
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#define memset(b, c, n) __builtin_memset((b), (c), (n))
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#if (defined(__GNUC__) && __GNUC__ >= 4)
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#define memmove(d, s, n) __builtin_memmove((d), (s), (n))
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#endif
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#if !defined(__clang__) && (defined(__GNUC__) && __GNUC__ >= 4)
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#define bcmp(b1, b2, n) __builtin_bcmp((b1), (b2), (n))
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#define bcopy(s, d, n) __builtin_bcopy((s), (d), (n))
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#endif
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#if defined(DDB)
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/* debugger entry points */
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void db_enter(void); /* in DDB only */
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int db_rint(int);
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#endif
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#ifdef BOOT_CONFIG
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void user_config(void);
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#endif
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#if defined(MULTIPROCESSOR)
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void _kernel_lock_init(void);
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void _kernel_lock(void);
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void _kernel_unlock(void);
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int _kernel_lock_held(void);
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#define KERNEL_LOCK_INIT() _kernel_lock_init()
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#define KERNEL_LOCK() _kernel_lock()
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#define KERNEL_UNLOCK() _kernel_unlock()
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#define KERNEL_ASSERT_LOCKED() KASSERT(_kernel_lock_held())
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#define KERNEL_ASSERT_UNLOCKED() KASSERT(panicstr || db_active || !_kernel_lock_held())
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#else /* ! MULTIPROCESSOR */
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#define KERNEL_LOCK_INIT() /* nothing */
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#define KERNEL_LOCK() /* nothing */
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#define KERNEL_UNLOCK() /* nothing */
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#define KERNEL_ASSERT_LOCKED() /* nothing */
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#define KERNEL_ASSERT_UNLOCKED() /* nothing */
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#endif /* MULTIPROCESSOR */
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#endif /* __SYSTM_H__ */
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