xref: /freebsd-11-stable/sys/sys/systm.h

/*-
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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	8.7 (Berkeley) 3/29/95
 * $FreeBSD: head/sys/sys/systm.h 97307 2002-05-26 16:03:13Z dfr $
 */

#ifndef _SYS_SYSTM_H_
#define	_SYS_SYSTM_H_

#include <machine/atomic.h>
#include <machine/cpufunc.h>
#include <sys/callout.h>
#include <sys/queue.h>

extern int securelevel;		/* system security level (see init(8)) */
extern int suser_enabled;	/* suser() is permitted to return 0 */

extern int cold;		/* nonzero if we are doing a cold boot */
extern const char *panicstr;	/* panic message */
extern char version[];		/* system version */
extern char copyright[];	/* system copyright */

extern int nswap;		/* size of swap space */

extern int nselcoll;		/* select collisions since boot */
extern struct mtx sellock;	/* select lock variable */
extern struct cv selwait;	/* select conditional variable */

extern int physmem;		/* physical memory */

extern dev_t rootdev;		/* root device */
extern dev_t rootdevs[2];	/* possible root devices */
extern char *rootdevnames[2];	/* names of possible root devices */
extern struct vnode *rootvp;	/* vnode equivalent to above */

extern int boothowto;		/* reboot flags, from console subsystem */
extern int bootverbose;		/* nonzero to print verbose messages */

extern int maxusers;		/* system tune hint */

#ifdef	INVARIANTS		/* The option is always available */
#define	KASSERT(exp,msg)	do { if (!(exp)) panic msg; } while (0)
#else
#define	KASSERT(exp,msg)
#endif

#define	CTASSERT(x)		_CTASSERT(x, __LINE__)
#define	_CTASSERT(x, y)		__CTASSERT(x, y)
#define	__CTASSERT(x, y)	typedef char __assert ## y[(x) ? 1 : -1]

/*
 * XXX the hints declarations are even more misplaced than most declarations
 * in this file, since they are needed in one file (per arch) and only used
 * in two files.
 * XXX most of these variables should be const.
 */
extern int envmode;
extern int hintmode;		/* 0 = off. 1 = config, 2 = fallback */
extern int dynamic_kenv;
extern struct sx kenv_lock;
extern char *kern_envp;
extern char static_env[];
extern char static_hints[];	/* by config for now */

extern char **kenvp;

/*
 * General function declarations.
 */

struct clockframe;
struct malloc_type;
struct mtx;
struct proc;
struct kse;
struct socket;
struct thread;
struct tty;
struct ucred;
struct uio;
struct _jmp_buf;

int	setjmp(struct _jmp_buf *);
void	longjmp(struct _jmp_buf *, int) __dead2;
void	Debugger(const char *msg);
int	dumpstatus(vm_offset_t addr, off_t count);
int	nullop(void);
int	eopnotsupp(void);
int	seltrue(dev_t dev, int which, struct thread *td);
int	ureadc(int, struct uio *);
void	*hashinit(int count, struct malloc_type *type, u_long *hashmask);
void	*phashinit(int count, struct malloc_type *type, u_long *nentries);

#ifdef RESTARTABLE_PANICS
void	panic(const char *, ...) __printflike(1, 2);
#else
void	panic(const char *, ...) __dead2 __printflike(1, 2);
#endif

void	cpu_boot(int);
void	cpu_rootconf(void);
void	critical_enter(void);
void	critical_exit(void);
void	init_param1(void);
void	init_param2(int physpages);
void	tablefull(const char *);
int	kvprintf(char const *, void (*)(int, void*), void *, int,
	    _BSD_VA_LIST_) __printflike(1, 0);
void	log(int, const char *, ...) __printflike(2, 3);
void	log_console(struct uio *);
int	printf(const char *, ...) __printflike(1, 2);
int	snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
int	sprintf(char *buf, const char *, ...) __printflike(2, 3);
int	uprintf(const char *, ...) __printflike(1, 2);
int	vprintf(const char *, _BSD_VA_LIST_) __printflike(1, 0);
int	vsnprintf(char *, size_t, const char *, _BSD_VA_LIST_) __printflike(3, 0);
int     vsprintf(char *buf, const char *, _BSD_VA_LIST_) __printflike(2, 0);
int	ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
int	sscanf(const char *, char const *, ...);
int	vsscanf(const char *, char const *, _BSD_VA_LIST_);
long	strtol(const char *, char **, int);
u_long	strtoul(const char *, char **, int);
quad_t	strtoq(const char *, char **, int);
u_quad_t strtouq(const char *, char **, int);
void	tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);

void	bcopy(const void *from, void *to, size_t len);
void	ovbcopy(const void *from, void *to, size_t len);

#ifdef __i386__
extern void	(*bzero)(void *buf, size_t len);
#else
void	bzero(void *buf, size_t len);
#endif

void	*memcpy(void *to, const void *from, size_t len);

int	copystr(const void *kfaddr, void *kdaddr, size_t len,
	    size_t *lencopied);
int	copyinstr(const void *udaddr, void *kaddr, size_t len,
	    size_t *lencopied);
int	copyin(const void *udaddr, void *kaddr, size_t len);
int	copyout(const void *kaddr, void *udaddr, size_t len);

int	fubyte(const void *base);
int	subyte(void *base, int byte);
int	suibyte(void *base, int byte);
int32_t	fuword32(const void *base);
int64_t	fuword64(const void *base);
long	fuword(const void *base);
int	suword(void *base, long word);
int	suword32(void *base, int32_t word);
int	suword64(void *base, int64_t word);
int	fusword(void *base);
int	susword(void *base, int word);

void	realitexpire(void *);

void	hardclock(struct clockframe *frame);
void	hardclock_process(struct thread *td, int user);
void	softclock(void *);
void	statclock(struct clockframe *frame);
void	statclock_process(struct kse *ke, register_t pc, int user);

void	startprofclock(struct proc *);
void	stopprofclock(struct proc *);
void	setstatclockrate(int hzrate);

/* flags for suser() and suser_cred() */
#define PRISON_ROOT	1

int	suser(struct thread *td);
int	suser_cred(struct ucred *cred, int flag);
int	cr_cansee(struct ucred *u1, struct ucred *u2);
int	cr_canseesocket(struct ucred *cred, struct socket *so);

char	*getenv(const char *name);
void	freeenv(char *env);
int	getenv_int(const char *name, int *data);
int	getenv_string(const char *name, char *data, int size);
int	getenv_quad(const char *name, quad_t *data);
int	setenv(const char *name, const char *value);
int	unsetenv(const char *name);
int	testenv(const char *name);

#ifdef APM_FIXUP_CALLTODO
struct timeval;
void	adjust_timeout_calltodo(struct timeval *time_change);
#endif /* APM_FIXUP_CALLTODO */

#include <sys/libkern.h>

/* Initialize the world */
void	consinit(void);
void	cpu_initclocks(void);
void	usrinfoinit(void);

/* Finalize the world. */
void	shutdown_nice(int);

/*
 * Kernel to clock driver interface.
 */
void	inittodr(time_t base);
void	resettodr(void);
void	startrtclock(void);

/* Timeouts */
typedef void timeout_t(void *);	/* timeout function type */
#define CALLOUT_HANDLE_INITIALIZER(handle)	\
	{ NULL }

void	callout_handle_init(struct callout_handle *);
struct	callout_handle timeout(timeout_t *, void *, int);
void	untimeout(timeout_t *, void *, struct callout_handle);
caddr_t	kern_timeout_callwheel_alloc(caddr_t v);
void	kern_timeout_callwheel_init(void);

/* Stubs for obsolete functions that used to be for interrupt  management */
static __inline void		spl0(void)		{ return; }
static __inline intrmask_t	splbio(void)		{ return 0; }
static __inline intrmask_t	splcam(void)		{ return 0; }
static __inline intrmask_t	splclock(void)		{ return 0; }
static __inline intrmask_t	splhigh(void)		{ return 0; }
static __inline intrmask_t	splimp(void)		{ return 0; }
static __inline intrmask_t	splnet(void)		{ return 0; }
static __inline intrmask_t	splsoftcam(void)	{ return 0; }
static __inline intrmask_t	splsoftclock(void)	{ return 0; }
static __inline intrmask_t	splsofttty(void)	{ return 0; }
static __inline intrmask_t	splsoftvm(void)		{ return 0; }
static __inline intrmask_t	splsofttq(void)		{ return 0; }
static __inline intrmask_t	splstatclock(void)	{ return 0; }
static __inline intrmask_t	spltty(void)		{ return 0; }
static __inline intrmask_t	splvm(void)		{ return 0; }
static __inline void		splx(intrmask_t ipl)	{ return; }

/*
 * Various callout lists.
 */

/* Exit callout list declarations. */
typedef void (*exitlist_fn)(struct proc *procp);

int	at_exit(exitlist_fn function);
int	rm_at_exit(exitlist_fn function);

/* Fork callout list declarations. */
typedef void (*forklist_fn)(struct proc *parent, struct proc *child, int flags);

int	at_fork(forklist_fn function);
int	rm_at_fork(forklist_fn function);

/* Exec callout list declarations. */
typedef void (*execlist_fn)(struct proc *procp);

int	at_exec(execlist_fn function);
int	rm_at_exec(execlist_fn function);

/*
 * Not exactly a callout LIST, but a callout entry.
 * Allow an external module to define a hardware watchdog tickler.
 * Normally a process would do this, but there are times when the
 * kernel needs to be able to hold off the watchdog, when the process
 * is not active, e.g., when dumping core.
 */
typedef void (*watchdog_tickle_fn)(void);

extern watchdog_tickle_fn	wdog_tickler;

/*
 * Common `proc' functions are declared here so that proc.h can be included
 * less often.
 */
int	msleep(void *chan, struct mtx *mtx, int pri, const char *wmesg,
	    int timo);
#define	tsleep(chan, pri, wmesg, timo)	msleep(chan, NULL, pri, wmesg, timo)
void	wakeup(void *chan);
void	wakeup_one(void *chan);

/*
 * Common `dev_t' stuff are declared here to avoid #include poisoning
 */

int major(dev_t x);
int minor(dev_t x);
dev_t makedev(int x, int y);
udev_t dev2udev(dev_t x);
dev_t udev2dev(udev_t x, int b);
int uminor(udev_t dev);
int umajor(udev_t dev);
udev_t makeudev(int x, int y);

/* XXX: Should be void nanodelay(u_int nsec); */
void	DELAY(int usec);

#endif /* !_SYS_SYSTM_H_ */