source: rtems-libbsd/freebsd/sys/sys/systm.h @ bae343a

/*-
 * 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.
 * 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
 * $FreeBSD$
 */

#ifndef _SYS_SYSTM_H_
#define _SYS_SYSTM_H_

#include <machine/atomic.h>
#include <machine/cpufunc.h>
#include <sys/callout.h>
#include <sys/cdefs.h>
#include <sys/queue.h>
#include <sys/stdint.h>         /* for people using printf mainly */

#ifndef __rtems__
extern int cold;                /* nonzero if we are doing a cold boot */
#else /* __rtems__ */
/* In RTEMS there is no cold boot */
#define cold 0
#endif /* __rtems__ */
extern int rebooting;           /* boot() has been called. */
extern const char *panicstr;    /* panic message */
extern char version[];          /* system version */
extern char copyright[];        /* system copyright */
extern int kstack_pages;        /* number of kernel stack pages */

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

extern u_long pagesizes[];      /* supported page sizes */
extern long physmem;            /* physical memory */
extern long realmem;            /* 'real' memory */

extern char *rootdevnames[2];   /* names of possible root devices */

extern int boothowto;           /* reboot flags, from console subsystem */
#ifndef __rtems__
extern int bootverbose;         /* nonzero to print verbose messages */
#else /* __rtems__ */
#define bootverbose    0        /* XXX RTEMS doesn't support verbose */
#endif /* __rtems__ */


extern int maxusers;            /* system tune hint */
extern int ngroups_max;         /* max # of supplemental groups */
#ifndef __rtems__
extern int vm_guest;            /* Running as virtual machine guest? */
#else /* __rtems__ */
#define vm_guest VM_GUEST_NO
#endif /* __rtems__ */

/*
 * Detected virtual machine guest types. The intention is to expand
 * and/or add to the VM_GUEST_VM type if specific VM functionality is
 * ever implemented (e.g. vendor-specific paravirtualization features).
 */
enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN };

#ifdef  INVARIANTS              /* The option is always available */
#define KASSERT(exp,msg) do {                                           \
        if (__predict_false(!(exp)))                                    \
                panic msg;                                              \
} while (0)
#define VNASSERT(exp, vp, msg) do {                                     \
        if (__predict_false(!(exp))) {                                  \
                vn_printf(vp, "VNASSERT failed\n");                     \
                panic msg;                                              \
        }                                                               \
} while (0)
#else
#define KASSERT(exp,msg) do { \
} while (0)

#define VNASSERT(exp, vp, msg) do { \
} while (0)
#endif

#ifndef CTASSERT                /* Allow lint to override */
#define CTASSERT(x)             _CTASSERT(x, __LINE__)
#define _CTASSERT(x, y)         __CTASSERT(x, y)
#define __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1 : -1]
#endif

/*
 * Assert that a pointer can be loaded from memory atomically.
 *
 * This assertion enforces stronger alignment than necessary.  For example,
 * on some architectures, atomicity for unaligned loads will depend on
 * whether or not the load spans multiple cache lines.
 */
#define ASSERT_ATOMIC_LOAD_PTR(var, msg)                                \
        KASSERT(sizeof(var) == sizeof(void *) &&                        \
            ((uintptr_t)&(var) & (sizeof(void *) - 1)) == 0, msg)

/*
 * 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 osreldate;
extern int envmode;
extern int hintmode;            /* 0 = off. 1 = config, 2 = fallback */
extern int dynamic_kenv;
extern struct mtx 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 inpcb;
struct lock_object;
struct malloc_type;
struct mtx;
struct proc;
struct socket;
struct thread;
struct tty;
struct ucred;
struct uio;
struct _jmp_buf;

#ifndef __rtems__
int     setjmp(struct _jmp_buf *);
void    longjmp(struct _jmp_buf *, int) __dead2;
#endif /* __rtems__ */
int     dumpstatus(vm_offset_t addr, off_t count);
int     nullop(void);
int     eopnotsupp(void);
int     ureadc(int, struct uio *);
void    hashdestroy(void *, struct malloc_type *, u_long);
void    *hashinit(int count, struct malloc_type *type, u_long *hashmark);
void    *hashinit_flags(int count, struct malloc_type *type,
    u_long *hashmask, int flags);
#define HASH_NOWAIT     0x00000001
#define HASH_WAITOK     0x00000002

void    *phashinit(int count, struct malloc_type *type, u_long *nentries);
void    g_waitidle(void);

#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_flush_dcache(void *, size_t);
void    cpu_rootconf(void);
void    critical_enter(void);
void    critical_exit(void);
void    init_param1(void);
void    init_param2(long physpages);
void    init_param3(long kmempages);
void    tablefull(const char *);
int     kvprintf(char const *, void (*)(int, void*), void *, int,
            __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 *, __va_list) __printflike(1, 0);
int     vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
int     vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
int     vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
int     ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
int     sscanf(const char *, char const *, ...) __nonnull(1) __nonnull(2);
int     vsscanf(const char *, char const *, __va_list) __nonnull(1) __nonnull(2);
long    strtol(const char *, char **, int) __nonnull(1);
u_long  strtoul(const char *, char **, int) __nonnull(1);
quad_t  strtoq(const char *, char **, int) __nonnull(1);
u_quad_t strtouq(const char *, char **, int) __nonnull(1);
void    tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
void    hexdump(const void *ptr, int length, const char *hdr, int flags);
#define HD_COLUMN_MASK  0xff
#define HD_DELIM_MASK   0xff00
#define HD_OMIT_COUNT   (1 << 16)
#define HD_OMIT_HEX     (1 << 17)
#define HD_OMIT_CHARS   (1 << 18)

#define ovbcopy(f, t, l) bcopy((f), (t), (l))
void    bcopy(const void *from, void *to, size_t len) __nonnull(1) __nonnull(2);
void    bzero(void *buf, size_t len) __nonnull(1);

void    *memcpy(void *to, const void *from, size_t len) __nonnull(1) __nonnull(2);
void    *memmove(void *dest, const void *src, size_t n) __nonnull(1) __nonnull(2);

int     copystr(const void * __restrict kfaddr, void * __restrict kdaddr,
            size_t len, size_t * __restrict lencopied)
            __nonnull(1) __nonnull(2);
int     copyinstr(const void * __restrict udaddr, void * __restrict kaddr,
            size_t len, size_t * __restrict lencopied)
            __nonnull(1) __nonnull(2);
int     copyin(const void * __restrict udaddr, void * __restrict kaddr,
            size_t len) __nonnull(1) __nonnull(2);
int     copyout(const void * __restrict kaddr, void * __restrict udaddr,
            size_t len) __nonnull(1) __nonnull(2);

int     fubyte(const void *base);
long    fuword(const void *base);
int     fuword16(void *base);
int32_t fuword32(const void *base);
int64_t fuword64(const void *base);
int     subyte(void *base, int byte);
int     suword(void *base, long word);
int     suword16(void *base, int word);
int     suword32(void *base, int32_t word);
int     suword64(void *base, int64_t word);
uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
u_long   casuword(volatile u_long *p, u_long oldval, u_long newval);

void    realitexpire(void *);

int     sysbeep(int hertz, int period);

void    hardclock(int usermode, uintfptr_t pc);
void    hardclock_cpu(int usermode);
void    softclock(void *);
void    statclock(int usermode);
void    profclock(int usermode, uintfptr_t pc);

void    startprofclock(struct proc *);
void    stopprofclock(struct proc *);
void    cpu_startprofclock(void);
void    cpu_stopprofclock(void);

#ifndef __rtems__
int     cr_cansee(struct ucred *u1, struct ucred *u2);
int     cr_canseesocket(struct ucred *cred, struct socket *so);
int     cr_canseeinpcb(struct ucred *cred, struct inpcb *inp);
#else /* __rtems__ */
#define cr_cansee(u1, u2) 1
#define cr_canseesocket(cred, so) 1
#define cr_canseeinpcb(cred, inp) 1
#endif /* __rtems__ */

char    *getenv(const char *name);
void    freeenv(char *env);
int     getenv_int(const char *name, int *data);
int     getenv_uint(const char *name, unsigned int *data);
int     getenv_long(const char *name, long *data);
int     getenv_ulong(const char *name, unsigned long *data);
int     getenv_string(const char *name, char *data, int size);
int     getenv_quad(const char *name, quad_t *data);
#ifndef __rtems__
int     setenv(const char *name, const char *value);
#endif /* __rtems__ */
int     unsetenv(const char *name);
int     testenv(const char *name);

typedef uint64_t (cpu_tick_f)(void);
void set_cputicker(cpu_tick_f *func, uint64_t freq, unsigned var);
extern cpu_tick_f *cpu_ticks;
uint64_t cpu_tickrate(void);
uint64_t cputick2usec(uint64_t tick);

#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);

/* 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 __unused)   { return; }

/*
 * Common `proc' functions are declared here so that proc.h can be included
 * less often.
 */
int     _sleep(void *chan, struct lock_object *lock, int pri, const char *wmesg,
            int timo) __nonnull(1);
#define msleep(chan, mtx, pri, wmesg, timo)                             \
        _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (timo))
#ifndef __rtems__
int     msleep_spin(void *chan, struct mtx *mtx, const char *wmesg, int timo)
            __nonnull(1);
#else /* __rtems__ */
#define msleep_spin(chan, mtx, wmesg, timo)                             \
        msleep((chan), (mtx), 0, (wmesg), (timo))
#endif /* __rtems__ */
#ifdef __rtems__
#include <unistd.h>
#define pause _bsd_pause
#endif /* __rtems__ */
int     pause(const char *wmesg, int timo);
#define tsleep(chan, pri, wmesg, timo)                                  \
        _sleep((chan), NULL, (pri), (wmesg), (timo))
void    wakeup(void *chan) __nonnull(1);
void    wakeup_one(void *chan) __nonnull(1);

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

struct cdev;
dev_t dev2udev(struct cdev *x);
const char *devtoname(struct cdev *cdev);

int poll_no_poll(int events);

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

/* Root mount holdback API */
struct root_hold_token;

struct root_hold_token *root_mount_hold(const char *identifier);
void root_mount_rel(struct root_hold_token *h);
void root_mount_wait(void);
int root_mounted(void);


/*
 * Unit number allocation API. (kern/subr_unit.c)
 */
struct unrhdr;
struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
void delete_unrhdr(struct unrhdr *uh);
void clean_unrhdr(struct unrhdr *uh);
void clean_unrhdrl(struct unrhdr *uh);
int alloc_unr(struct unrhdr *uh);
int alloc_unrl(struct unrhdr *uh);
void free_unr(struct unrhdr *uh, u_int item);

/*
 * This is about as magic as it gets.  fortune(1) has got similar code
 * for reversing bits in a word.  Who thinks up this stuff??
 *
 * Yes, it does appear to be consistently faster than:
 * while (i = ffs(m)) {
 *      m >>= i;
 *      bits++;
 * }
 * and
 * while (lsb = (m & -m)) {     // This is magic too
 *      m &= ~lsb;              // or: m ^= lsb
 *      bits++;
 * }
 * Both of these latter forms do some very strange things on gcc-3.1 with
 * -mcpu=pentiumpro and/or -march=pentiumpro and/or -O or -O2.
 * There is probably an SSE or MMX popcnt instruction.
 *
 * I wonder if this should be in libkern?
 *
 * XXX Stop the presses!  Another one:
 * static __inline u_int32_t
 * popcnt1(u_int32_t v)
 * {
 *      v -= ((v >> 1) & 0x55555555);
 *      v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
 *      v = (v + (v >> 4)) & 0x0F0F0F0F;
 *      return (v * 0x01010101) >> 24;
 * }
 * The downside is that it has a multiply.  With a pentium3 with
 * -mcpu=pentiumpro and -march=pentiumpro then gcc-3.1 will use
 * an imull, and in that case it is faster.  In most other cases
 * it appears slightly slower.
 *
 * Another variant (also from fortune):
 * #define BITCOUNT(x) (((BX_(x)+(BX_(x)>>4)) & 0x0F0F0F0F) % 255)
 * #define  BX_(x)     ((x) - (((x)>>1)&0x77777777)            \
 *                          - (((x)>>2)&0x33333333)            \
 *                          - (((x)>>3)&0x11111111))
 */
static __inline uint32_t
bitcount32(uint32_t x)
{

        x = (x & 0x55555555) + ((x & 0xaaaaaaaa) >> 1);
        x = (x & 0x33333333) + ((x & 0xcccccccc) >> 2);
        x = (x + (x >> 4)) & 0x0f0f0f0f;
        x = (x + (x >> 8));
        x = (x + (x >> 16)) & 0x000000ff;
        return (x);
}

#endif /* !_SYS_SYSTM_H_ */