FreeBSD/Linux Kernel Cross Reference
sys/dev/kloader.h

     /*      $NetBSD: kloader.h,v 1.4 2006/01/20 02:47:30 uwe Exp $  */
     
     /*-
      * Copyright (c) 2001, 2002, 2004 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * 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 NetBSD
     *        Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    #ifndef _DEV_KLOADER_H_
    #define _DEV_KLOADER_H_
    
    #ifdef KLOADER_NO_BOOTINFO
    struct bootinfo {
            int dummy;
    };
    #else
    #include <machine/bootinfo.h>
    #endif
    
    struct kloader_ops;
    struct kloader_page_tag;
    struct kloader_bootinfo;
    
    /*
     * kloader_bootfunc_t load new kernel into existing kernel area from
     * lined list of new kernel pieces.  and then, jump to kernel
     * entry. This function must be PIC.
     */
    typedef void kloader_bootfunc_t(struct kloader_bootinfo *,
        struct kloader_page_tag *);
    /*
     * koader_jumpfunc_t jump to boot loader described abobe.
     */
    typedef void kloader_jumpfunc_t(kloader_bootfunc_t *, vaddr_t,
        struct kloader_bootinfo *, struct kloader_page_tag *);
    /*
     * reset func is optional. may be called when kloader reboot is failed.
     */
    struct kloader_ops {
            kloader_jumpfunc_t *jump;
            kloader_bootfunc_t *boot;
            void (*reset)(void);
    };
    
    /*
     * new kernel is primary loaded into discrete pages.
     */
    struct kloader_page_tag {
            uint32_t next;
            uint32_t src;
            uint32_t dst;
            uint32_t sz;
    } __attribute__((__packed__, __aligned__(4)));
    
    #define KLOADER_KERNELARGS_MAX          256
    
    struct kloader_bootinfo {
            /* kernel entry point */
            vaddr_t entry;
    
            /* argc, argv type boot argument */
            int argc;
            char **argv;
    
            /* struct type boot argument */
            struct bootinfo bootinfo;
    
            /* argv buffer */
            char _argbuf[KLOADER_KERNELARGS_MAX];
    } __attribute__((__packed__, __aligned__(4)));
    
    /*
    * kloader_reboot_setup sets machine dependent kloader_ops to
    * kloader. (call __kloader_reboot_setup here.) and load new kernel.
    */
   void kloader_reboot_setup(const char *);
   void __kloader_reboot_setup(struct kloader_ops *, const char *);
   
   /*
    * kloader_reboot jumps to 2nd boot loader.
    * call after all shutdown hooks done.
    */
   void kloader_reboot(void) __attribute__((__noreturn__));
   
   /*
    * kloader_bootinfo_set sets arguments of new kernel to boot. this is optional.
    * theses parameter is passed to kloader_bootfunc_t.
    */
   void kloader_bootinfo_set(struct kloader_bootinfo *, int, char *[],
       struct bootinfo *, int);
   
   #endif /* _DEV_KLOADER_H_ */

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