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