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: src/sys/sys/kernel.h,v 1.22.2.3 1999/09/05 08:22:30 peter Exp $
     */
    
    #ifndef _SYS_KERNEL_H_
    #define _SYS_KERNEL_H_
    
    /* Global variables for the kernel. */
    
    /* 1.1 */
    extern long hostid;
    extern char hostname[MAXHOSTNAMELEN];
    extern int hostnamelen;
    extern char domainname[MAXHOSTNAMELEN];
    extern int domainnamelen;
    extern char kernelname[MAXPATHLEN];
    
    /* 1.2 */
    extern volatile struct timeval mono_time;
    extern struct timeval boottime;
    extern struct timeval runtime;
    extern volatile struct timeval time;
    extern struct timezone tz;                      /* XXX */
    
    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 ticks;
    extern int lbolt;                       /* once a second sleep address */
    extern int tickdelta;
    extern long timedelta;
    
    /*
     * The following macros are used to declare global sets of objects, which
     * are collected by the linker into a `struct linker_set' as defined below.
     *
     * NB: the constants defined below must match those defined in
     * ld/ld.h.  Since their calculation requires arithmetic, we
     * can't name them symbolically (e.g., 23 is N_SETT | N_EXT).
     */
    #define MAKE_SET(set, sym, type) \
            static void const * const __set_##set##_sym_##sym = &sym; \
            __asm(".stabs \"_" #set "\", " #type ", 0, 0, _" #sym)
    #define TEXT_SET(set, sym) MAKE_SET(set, sym, 23)
    #define DATA_SET(set, sym) MAKE_SET(set, sym, 25)
    #define BSS_SET(set, sym)  MAKE_SET(set, sym, 27)
    #define ABS_SET(set, sym)  MAKE_SET(set, sym, 21)
    
    
    /*
     * 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            = 0x00000000,   /* not executed; for linker*/
           SI_SUB_CONSOLE          = 0x08000000,   /* console*/
           SI_SUB_COPYRIGHT        = 0x08000001,   /* first use of console*/
           SI_SUB_VM               = 0x10000000,   /* virtual memory system init*/
           SI_SUB_KMEM             = 0x18000000,   /* kernel memory*/
           SI_SUB_CPU              = 0x20000000,   /* CPU resource(s)*/
           SI_SUB_DEVFS            = 0x22000000,   /* get DEVFS ready */
           SI_SUB_DRIVERS          = 0x23000000,   /* Let Drivers initialize */
           SI_SUB_CONFIGURE        = 0x24000000,   /* Configure devices */
           SI_SUB_INTRINSIC        = 0x28000000,   /* proc 0*/
           SI_SUB_RUN_QUEUE        = 0x30000000,   /* the run queue*/
           SI_SUB_VM_CONF          = 0x38000000,   /* config VM, set limits*/
           SI_SUB_VFS              = 0x40000000,   /* virtual file system*/
           SI_SUB_CLOCKS           = 0x48000000,   /* real time and stat clocks*/
           SI_SUB_MBUF             = 0x50000000,   /* mbufs*/
           SI_SUB_CLIST            = 0x58000000,   /* clists*/
           SI_SUB_SYSV_SHM         = 0x64000000,   /* System V shared memory*/
           SI_SUB_SYSV_SEM         = 0x68000000,   /* System V semaphores*/
           SI_SUB_SYSV_MSG         = 0x6C000000,   /* System V message queues*/
           SI_SUB_PSEUDO           = 0x70000000,   /* pseudo devices*/
           SI_SUB_PROTO_BEGIN      = 0x80000000,   /* XXX: set splimp (kludge)*/
           SI_SUB_PROTO_IF         = 0x84000000,   /* interfaces*/
           SI_SUB_PROTO_DOMAIN     = 0x88000000,   /* domains (address families?)*/
           SI_SUB_PROTO_END        = 0x8fffffff,   /* XXX: set splx (kludge)*/
           SI_SUB_KPROF            = 0x90000000,   /* kernel profiling*/
           SI_SUB_KICK_SCHEDULER   = 0xa0000000,   /* start the timeout events*/
           SI_SUB_INT_CONFIG_HOOKS = 0xa8000000,   /* Interrupts enabled config */
           SI_SUB_ROOT_CONF        = 0xb0000000,   /* Find root devices */
           SI_SUB_DUMP_CONF        = 0xb2000000,   /* Find dump devices */
           SI_SUB_MOUNT_ROOT       = 0xb4000000,   /* root mount*/
           SI_SUB_ROOT_FDTAB       = 0xb8000000,   /* root vnode in fd table...*/
           SI_SUB_SWAP             = 0xc0000000,   /* swap*/
           SI_SUB_INTRINSIC_POST   = 0xd0000000,   /* proc 0 cleanup*/
           SI_SUB_KTHREAD_INIT     = 0xe0000000,   /* init process*/
           SI_SUB_KTHREAD_PAGE     = 0xe4000000,   /* pageout daemon*/
           SI_SUB_KTHREAD_VM       = 0xe8000000,   /* vm daemon*/
           SI_SUB_KTHREAD_UPDATE   = 0xec000000,   /* update daemon*/
           SI_SUB_RUN_SCHEDULER    = 0xffffffff    /* scheduler: no return*/
   };
   
   
   /*
    * Some enumerated orders; "ANY" sorts last.
    */
   enum sysinit_elem_order {
           SI_ORDER_FIRST          = 0x00000000,   /* first*/
           SI_ORDER_SECOND         = 0x00000001,   /* second*/
           SI_ORDER_THIRD          = 0x00000002,   /* third*/
           SI_ORDER_MIDDLE         = 0x10000000,   /* somewhere in the middle */
           SI_ORDER_ANY            = 0xffffffff    /* last*/
   };
   
   
   /*
    * System initialization call types; currently two are supported... one
    * to do a simple function call and one to cause a process to be started
    * by the kernel on the callers behalf.
    */
   typedef enum sysinit_elem_type {
           SI_TYPE_DEFAULT         = 0x00000000,   /* No special processing*/
           SI_TYPE_KTHREAD         = 0x00000001    /* start kernel thread*/
   } si_elem_t;
   
   
   /*
    * A system initialization call instance
    *
    * The subsystem
    */
   struct sysinit {
           unsigned int    subsystem;              /* subsystem identifier*/
           unsigned int    order;                  /* init order within subsystem*/
           void            (*func) __P((void *));  /* init function*/
           void            *udata;                 /* multiplexer/argument */
           si_elem_t       type;                   /* sysinit_elem_type*/
   };
   
   
   /*
    * Default: no special processing
    */
   #define SYSINIT(uniquifier, subsystem, order, func, ident)      \
           static struct sysinit uniquifier ## _sys_init = {       \
                   subsystem,                                      \
                   order,                                          \
                   func,                                           \
                   ident,                                          \
                   SI_TYPE_DEFAULT                                 \
           };                                                      \
           DATA_SET(sysinit_set,uniquifier ## _sys_init);
   
   /*
    * Call 'fork()' before calling '(*func)(ident)';
    * for making a kernel 'thread' (or builtin process.)
    */
   #define SYSINIT_KT(uniquifier, subsystem, order, func, ident)   \
           static struct sysinit uniquifier ## _sys_init = {       \
                   subsystem,                                      \
                   order,                                          \
                   func,                                           \
                   ident,                                          \
                   SI_TYPE_KTHREAD                                 \
           };                                                      \
           DATA_SET(sysinit_set,uniquifier ## _sys_init);
   
   
   /*
    * A kernel process descriptor; used to start "internal" daemons
    *
    * Note: global_procpp may be NULL for no global save area
    */
   struct kproc_desc {
           char            *arg0;                  /* arg 0 (for 'ps' listing)*/
           void            (*func) __P((void));    /* "main" for kernel process*/
           struct proc     **global_procpp;        /* ptr to proc ptr save area*/
   };
   
   void    kproc_start __P((void *udata));
   
   #ifdef PSEUDO_LKM
   #include <sys/conf.h>
   #include <sys/exec.h>
   #include <sys/sysent.h>
   #include <sys/lkm.h>
   
   #define PSEUDO_SET(init, name) \
           extern struct linker_set MODVNOPS; \
           MOD_MISC(name); \
           static int \
           name ## _load(struct lkm_table *lkmtp, int cmd) \
                   { init((void *)NULL /* XXX unused (?) */); return 0; } \
           static int \
           name ## _unload(struct lkm_table *lkmtp, int cmd) \
                   { return EINVAL; } \
           int \
           name ## _mod(struct lkm_table *lkmtp, int cmd, int ver) { \
                   DISPATCH(lkmtp, cmd, ver, name ## _load, name ## _unload, \
                            lkm_nullcmd); }
   #else /* PSEUDO_LKM */
   
   /*
    * Compatibility.  To be deprecated after LKM is updated.
    */
   #define PSEUDO_SET(sym, name)   SYSINIT(ps, SI_SUB_PSEUDO, SI_ORDER_ANY, sym, 0)
   
   #endif /* PSEUDO_LKM */
   
   struct linker_set {
           int             ls_length;
           const void      *ls_items[1];           /* really ls_length of them,
                                                    * trailing NULL */
   };
   
   extern struct linker_set execsw_set;
   
   #endif /* !_SYS_KERNEL_H_*/

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