FreeBSD/Linux Kernel Cross Reference
sys/sys/kernel.h

     /*-
      * Copyright (c) 1995 Terrence R. Lambert
      * All rights reserved.
      *
      * Copyright (c) 1990, 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.
     *
     *      @(#)kernel.h    8.3 (Berkeley) 1/21/94
     * $FreeBSD: releng/5.3/sys/sys/kernel.h 136588 2004-10-16 08:43:07Z cvs2svn $
     */
    
    #ifndef _SYS_KERNEL_H_
    #define _SYS_KERNEL_H_
    
    #include <sys/linker_set.h>
    
    #ifdef _KERNEL
    
    /* for intrhook below */
    #include <sys/queue.h>
    
    /* Global variables for the kernel. */
    
    /* 1.1 */
    extern unsigned long hostid;
    extern char hostname[MAXHOSTNAMELEN];
    extern int hostnamelen;
    extern char domainname[MAXHOSTNAMELEN];
    extern int domainnamelen;
    extern char kernelname[MAXPATHLEN];
    
    extern int tick;                        /* usec per tick (1000000 / hz) */
    extern int hz;                          /* system clock's frequency */
    extern int psratio;                     /* ratio: prof / stat */
    extern int stathz;                      /* statistics clock's frequency */
    extern int profhz;                      /* profiling clock's frequency */
    extern int profprocs;                   /* number of process's profiling */
    extern int ticks;
    extern int lbolt;                       /* once a second sleep address */
    
    extern int tz_minuteswest;
    extern int tz_dsttime;
    
    #endif /* _KERNEL */
    
    /*
     * Enumerated types for known system startup interfaces.
     *
     * Startup occurs in ascending numeric order; the list entries are
     * sorted prior to attempting startup to guarantee order.  Items
     * of the same level are arbitrated for order based on the 'order'
     * element.
     *
     * These numbers are arbitrary and are chosen ONLY for ordering; the
     * enumeration values are explicit rather than implicit to provide
     * for binary compatibility with inserted elements.
     *
     * The SI_SUB_RUN_SCHEDULER value must have the highest lexical value.
     *
     * The SI_SUB_CONSOLE and SI_SUB_SWAP values represent values used by
     * the BSD 4.4Lite but not by FreeBSD; they are maintained in dependent
     * order to support porting.
     *
     * The SI_SUB_PROTO_BEGIN and SI_SUB_PROTO_END bracket a range of
     * initializations to take place at splimp().  This is a historical
     * wart that should be removed -- probably running everything at
    * splimp() until the first init that doesn't want it is the correct
    * fix.  They are currently present to ensure historical behavior.
    */
   enum sysinit_sub_id {
           SI_SUB_DUMMY            = 0x0000000,    /* not executed; for linker*/
           SI_SUB_DONE             = 0x0000001,    /* processed*/
           SI_SUB_TUNABLES         = 0x0700000,    /* establish tunable values */
           SI_SUB_CONSOLE          = 0x0800000,    /* console*/
           SI_SUB_COPYRIGHT        = 0x0800001,    /* first use of console*/
           SI_SUB_SETTINGS         = 0x0880000,    /* check and recheck settings */
           SI_SUB_MTX_POOL_STATIC  = 0x0900000,    /* static mutex pool */
           SI_SUB_LOCKMGR          = 0x0980000,    /* lockmgr locks */
           SI_SUB_VM               = 0x1000000,    /* virtual memory system init*/
           SI_SUB_KMEM             = 0x1800000,    /* kernel memory*/
           SI_SUB_KVM_RSRC         = 0x1A00000,    /* kvm operational limits*/
           SI_SUB_WITNESS          = 0x1A80000,    /* witness initialization */
           SI_SUB_MTX_POOL_DYNAMIC = 0x1AC0000,    /* dynamic mutex pool */
           SI_SUB_LOCK             = 0x1B00000,    /* various locks */
           SI_SUB_EVENTHANDLER     = 0x1C00000,    /* eventhandler init */
           SI_SUB_KLD              = 0x2000000,    /* KLD and module setup */
           SI_SUB_CPU              = 0x2100000,    /* CPU resource(s)*/
           SI_SUB_MAC              = 0x2180000,    /* TrustedBSD MAC subsystem */
           SI_SUB_MAC_POLICY       = 0x21C0000,    /* TrustedBSD MAC policies */
           SI_SUB_MAC_LATE         = 0x21D0000,    /* TrustedBSD MAC subsystem */
           SI_SUB_INTRINSIC        = 0x2200000,    /* proc 0*/
           SI_SUB_VM_CONF          = 0x2300000,    /* config VM, set limits*/
           SI_SUB_RUN_QUEUE        = 0x2400000,    /* set up run queue*/
           SI_SUB_KTRACE           = 0x2480000,    /* ktrace */
           SI_SUB_CREATE_INIT      = 0x2500000,    /* create init process*/
           SI_SUB_SCHED_IDLE       = 0x2600000,    /* required idle procs */
           SI_SUB_MBUF             = 0x2700000,    /* mbuf subsystem */
           SI_SUB_INTR             = 0x2800000,    /* interrupt threads */
           SI_SUB_SOFTINTR         = 0x2800001,    /* start soft interrupt thread */
           SI_SUB_DEVFS            = 0x2F00000,    /* devfs ready for devices */
           SI_SUB_INIT_IF          = 0x3000000,    /* prep for net interfaces */
           SI_SUB_DRIVERS          = 0x3100000,    /* Let Drivers initialize */
           SI_SUB_CONFIGURE        = 0x3800000,    /* Configure devices */
           SI_SUB_VFS              = 0x4000000,    /* virtual filesystem*/
           SI_SUB_CLOCKS           = 0x4800000,    /* real time and stat clocks*/
           SI_SUB_CLIST            = 0x5800000,    /* clists*/
           SI_SUB_SYSV_SHM         = 0x6400000,    /* System V shared memory*/
           SI_SUB_SYSV_SEM         = 0x6800000,    /* System V semaphores*/
           SI_SUB_SYSV_MSG         = 0x6C00000,    /* System V message queues*/
           SI_SUB_P1003_1B         = 0x6E00000,    /* P1003.1B realtime */
           SI_SUB_PSEUDO           = 0x7000000,    /* pseudo devices*/
           SI_SUB_EXEC             = 0x7400000,    /* execve() handlers */
           SI_SUB_PROTO_BEGIN      = 0x8000000,    /* XXX: set splimp (kludge)*/
           SI_SUB_PROTO_IF         = 0x8400000,    /* interfaces*/
           SI_SUB_PROTO_DOMAIN     = 0x8800000,    /* domains (address families?)*/
           SI_SUB_PROTO_IFATTACHDOMAIN     = 0x8800001,    /* domain dependent data init*/
           SI_SUB_PROTO_END        = 0x8ffffff,    /* XXX: set splx (kludge)*/
           SI_SUB_KPROF            = 0x9000000,    /* kernel profiling*/
           SI_SUB_KICK_SCHEDULER   = 0xa000000,    /* start the timeout events*/
           SI_SUB_INT_CONFIG_HOOKS = 0xa800000,    /* Interrupts enabled config */
           SI_SUB_ROOT_CONF        = 0xb000000,    /* Find root devices */
           SI_SUB_DUMP_CONF        = 0xb200000,    /* Find dump devices */
           SI_SUB_RAID             = 0xb380000,    /* Configure RAIDframe or Vinum */
           SI_SUB_MOUNT_ROOT       = 0xb400000,    /* root mount*/
           SI_SUB_SWAP             = 0xc000000,    /* swap */
           SI_SUB_INTRINSIC_POST   = 0xd000000,    /* proc 0 cleanup*/
           SI_SUB_KTHREAD_INIT     = 0xe000000,    /* init process*/
           SI_SUB_KTHREAD_PAGE     = 0xe400000,    /* pageout daemon*/
           SI_SUB_KTHREAD_VM       = 0xe800000,    /* vm daemon*/
           SI_SUB_KTHREAD_BUF      = 0xea00000,    /* buffer daemon*/
           SI_SUB_KTHREAD_UPDATE   = 0xec00000,    /* update daemon*/
           SI_SUB_KTHREAD_IDLE     = 0xee00000,    /* idle procs*/
           SI_SUB_SMP              = 0xf000000,    /* start the APs*/
           SI_SUB_RUN_SCHEDULER    = 0xfffffff     /* scheduler*/
   };
   
   
   /*
    * Some enumerated orders; "ANY" sorts last.
    */
   enum sysinit_elem_order {
           SI_ORDER_FIRST          = 0x0000000,    /* first*/
           SI_ORDER_SECOND         = 0x0000001,    /* second*/
           SI_ORDER_THIRD          = 0x0000002,    /* third*/
           SI_ORDER_MIDDLE         = 0x1000000,    /* somewhere in the middle */
           SI_ORDER_ANY            = 0xfffffff     /* last*/
   };
   
   
   /*
    * A system initialization call instance
    *
    * At the moment there is one instance of sysinit.  We probably do not
    * want two which is why this code is if'd out, but we definitely want
    * to discern SYSINIT's which take non-constant data pointers and
    * SYSINIT's which take constant data pointers,
    *
    * The C_* macros take functions expecting const void * arguments 
    * while the non-C_* macros take functions expecting just void * arguments.
    *
    * With -Wcast-qual on, the compiler issues warnings:
    *      - if we pass non-const data or functions taking non-const data
    *        to a C_* macro.
    *
    *      - if we pass const data to the normal macros
    *
    * However, no warning is issued if we pass a function taking const data
    * through a normal non-const macro.  This is ok because the function is
    * saying it won't modify the data so we don't care whether the data is
    * modifiable or not.
    */
   
   typedef void (*sysinit_nfunc_t)(void *);
   typedef void (*sysinit_cfunc_t)(const void *);
   
   struct sysinit {
           enum sysinit_sub_id     subsystem;      /* subsystem identifier*/
           enum sysinit_elem_order order;          /* init order within subsystem*/
           sysinit_cfunc_t func;                   /* function             */
           const void      *udata;                 /* multiplexer/argument */
   };
   
   /*
    * Default: no special processing
    *
    * The C_ version of SYSINIT is for data pointers to const
    * data ( and functions taking data pointers to const data ).
    * At the moment it is no different from SYSINIT and thus
    * still results in warnings.
    *
    * The casts are necessary to have the compiler produce the
    * correct warnings when -Wcast-qual is used.
    *
    */
   #define C_SYSINIT(uniquifier, subsystem, order, func, ident)    \
           static struct sysinit uniquifier ## _sys_init = {       \
                   subsystem,                                      \
                   order,                                          \
                   func,                                           \
                   (ident)                                         \
           };                                                      \
           DATA_SET(sysinit_set,uniquifier ## _sys_init);
   
   #define SYSINIT(uniquifier, subsystem, order, func, ident)      \
           C_SYSINIT(uniquifier, subsystem, order,                 \
           (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
   
   /*
    * Called on module unload: no special processing
    */
   #define C_SYSUNINIT(uniquifier, subsystem, order, func, ident)  \
           static struct sysinit uniquifier ## _sys_uninit = {     \
                   subsystem,                                      \
                   order,                                          \
                   func,                                           \
                   (ident)                                         \
           };                                                      \
           DATA_SET(sysuninit_set,uniquifier ## _sys_uninit)
   
   #define SYSUNINIT(uniquifier, subsystem, order, func, ident)    \
           C_SYSUNINIT(uniquifier, subsystem, order,               \
           (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
   
   void    sysinit_add(struct sysinit **set, struct sysinit **set_end);
   
   /*
    * Infrastructure for tunable 'constants'.  Value may be specified at compile
    * time or kernel load time.  Rules relating tunables together can be placed
    * in a SYSINIT function at SI_SUB_TUNABLES with SI_ORDER_LAST.
    *
    * WARNING: developers should never use the reserved suffixes specified in
    * loader.conf(5) for any tunables or conflicts will result.
    */
   
   extern void tunable_int_init(void *);
   struct tunable_int {
           const char *path;
           int *var;
   };
   #define TUNABLE_INT(path, var)                                  \
           _TUNABLE_INT((path), (var), __LINE__)
   #define _TUNABLE_INT(path, var, line)                           \
           __TUNABLE_INT((path), (var), line)
   
   #define __TUNABLE_INT(path, var, line)                          \
           static struct tunable_int __tunable_int_ ## line = {    \
                   path,                                           \
                   var,                                            \
           };                                                      \
           SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \
                tunable_int_init, &__tunable_int_ ## line)
   
   #define TUNABLE_INT_FETCH(path, var)    getenv_int((path), (var))
   
   extern void tunable_quad_init(void *);
   struct tunable_quad {
           const char *path;
           quad_t *var;
   };
   #define TUNABLE_QUAD(path, var)                                 \
           _TUNABLE_QUAD((path), (var), __LINE__)
   #define _TUNABLE_QUAD(path, var, line)                          \
           __TUNABLE_QUAD((path), (var), line)
   
   #define __TUNABLE_QUAD(path, var, line)                 \
           static struct tunable_quad __tunable_quad_ ## line = {  \
                   path,                                           \
                   var,                                            \
           };                                                      \
           SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \
               tunable_quad_init, &__tunable_quad_ ## line)
   
   #define TUNABLE_QUAD_FETCH(path, var)   getenv_quad((path), (var))
   
   extern void tunable_str_init(void *);
   struct tunable_str {
           const char *path;
           char *var;
           int size;
   };
   #define TUNABLE_STR(path, var, size)                            \
           _TUNABLE_STR((path), (var), (size), __LINE__)
   #define _TUNABLE_STR(path, var, size, line)                     \
           __TUNABLE_STR((path), (var), (size), line)
   
   #define __TUNABLE_STR(path, var, size, line)                    \
           static struct tunable_str __tunable_str_ ## line = {    \
                   path,                                           \
                   var,                                            \
                   size,                                           \
           };                                                      \
           SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \
                tunable_str_init, &__tunable_str_ ## line)
   
   #define TUNABLE_STR_FETCH(path, var, size)                      \
           getenv_string((path), (var), (size))
   
   void    net_warn_not_mpsafe(const char *component);
   #define NET_NEEDS_GIANT(component)                                      \
           SYSINIT(__net_warn_not_mpsafe_ ## __FILE__,                     \
               SI_SUB_SETTINGS, SI_ORDER_SECOND, net_warn_not_mpsafe, component);
   
   struct intr_config_hook {
           TAILQ_ENTRY(intr_config_hook) ich_links;
           void    (*ich_func)(void *arg);
           void    *ich_arg;
   };
   
   int     config_intrhook_establish(struct intr_config_hook *hook);
   void    config_intrhook_disestablish(struct intr_config_hook *hook);
   
   #endif /* !_SYS_KERNEL_H_*/

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