From owner-freebsd-questions  Mon May 21 14: 3: 3 2001
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To: "'questions@FreeBSD.org'" <questions@FreeBSD.org>
Subject: about kld
Date: Mon, 21 May 2001 18:03:11 +0800
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hi:
i copy a module file as fallow:
#include <sys/types.h>
    #include <sys/module.h>
    #include <sys/systm.h>  /* uprintf */ 
    #include <sys/errno.h>
    #include <sys/param.h>  /* defines used in kernel.h */
    #include <sys/kernel.h> /* types used in module initialization */
    
    /* 
     * Load handler that deals with the loading and unloading of a KLD.
     */
    
    static int
    skel_loader(struct module *m, int what, void *arg)
    {
      int err = 0;
      
      switch (what) {
      case MOD_LOAD:                /* kldload */
        uprintf("Skeleton KLD loaded.\n");
        break;
      case MOD_UNLOAD:
        uprintf("Skeleton KLD unloaded.\n");
        break;
      default:
        err = EINVAL;
        break;
      }
      return(err);
    }
    
    /* Declare this module to the rest of the kernel */
    
    DECLARE_MODULE(skeleton, skel_loader, SI_SUB_KLD, SI_ORDER_ANY);
	Makefile as fallow:
	SRCS=skeleton.c
    	KMOD=skeleton
        .include <bsd.kmod.mk>

 but when i exeute : kldload -v ./skeleton.ko
	it is error,the error message as fallow:
Fatal trap 12:page fault while in kernel mode
fault virtual address =0x83e58955
fault code = suppervisor read,page not present
instruction pointer = 0x8:0xc02b8af8
stack pointer = 0x10:0xc95b6e98
frame pointer = 0x1:0xc95b6e98
code segment = base 0x0 limit 0xfffff ,type 0x1b
		= DPL 0 ,pres 1,def32 1,gran 1
process eflags = interrupt enabled ,resume,IOPL = 0
current process = 8346(kldload)
interrupt mask = none
trap number = 12
panic :page default 

please tell why ,and how resolve it
by the way the version of the freebsd is 4.3
the best regard










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