The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $NetBSD: kloader.h,v 1.7 2008/09/08 23:36:54 gmcgarry Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 2001, 2002, 2004 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   26  * POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #ifndef _DEV_KLOADER_H_
   30 #define _DEV_KLOADER_H_
   31 
   32 #ifdef KLOADER_NO_BOOTINFO
   33 struct bootinfo {
   34         int dummy;
   35 };
   36 #else
   37 #include <machine/bootinfo.h>
   38 #endif
   39 
   40 struct kloader_ops;
   41 struct kloader_page_tag;
   42 struct kloader_bootinfo;
   43 
   44 /*
   45  * kloader_bootfunc_t load new kernel into existing kernel area from
   46  * lined list of new kernel pieces.  and then, jump to kernel
   47  * entry. This function must be PIC.
   48  */
   49 typedef void kloader_bootfunc_t(struct kloader_bootinfo *,
   50     struct kloader_page_tag *);
   51 /*
   52  * koader_jumpfunc_t jump to boot loader described abobe.
   53  */
   54 typedef void kloader_jumpfunc_t(kloader_bootfunc_t *, vaddr_t,
   55     struct kloader_bootinfo *, struct kloader_page_tag *);
   56 /*
   57  * reset func is optional. may be called when kloader reboot is failed.
   58  */
   59 struct kloader_ops {
   60         kloader_jumpfunc_t *jump;
   61         kloader_bootfunc_t *boot;
   62         void (*reset)(void);
   63 };
   64 
   65 /*
   66  * new kernel is primary loaded into discrete pages.
   67  */
   68 struct kloader_page_tag {
   69         uint32_t next;
   70         uint32_t src;
   71         uint32_t dst;
   72         uint32_t sz;
   73 } __packed __aligned(4);
   74 
   75 #define KLOADER_KERNELARGS_MAX          256
   76 
   77 struct kloader_bootinfo {
   78         /* kernel entry point */
   79         vaddr_t entry;
   80 
   81         /* argc, argv type boot argument */
   82         int argc;
   83         char **argv;
   84 
   85         /* struct type boot argument */
   86         struct bootinfo bootinfo;
   87 
   88         /* argv buffer */
   89         char _argbuf[KLOADER_KERNELARGS_MAX];
   90 } __packed __aligned(4);
   91 
   92 /*
   93  * kloader_reboot_setup sets machine dependent kloader_ops to
   94  * kloader. (call __kloader_reboot_setup here.) and load new kernel.
   95  */
   96 void kloader_reboot_setup(const char *);
   97 void __kloader_reboot_setup(struct kloader_ops *, const char *);
   98 
   99 /*
  100  * kloader_reboot jumps to 2nd boot loader.
  101  * call after all shutdown hooks done.
  102  */
  103 void kloader_reboot(void) __dead;
  104 
  105 /*
  106  * kloader_bootinfo_set sets arguments of new kernel to boot. this is optional.
  107  * theses parameter is passed to kloader_bootfunc_t.
  108  */
  109 void kloader_bootinfo_set(struct kloader_bootinfo *, int, char *[],
  110     struct bootinfo *, int);
  111 
  112 #endif /* _DEV_KLOADER_H_ */

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