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/xen/interface/kexec.h

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    1 /******************************************************************************
    2  * kexec.h - Public portion
    3  * 
    4  * Permission is hereby granted, free of charge, to any person obtaining a copy
    5  * of this software and associated documentation files (the "Software"), to
    6  * deal in the Software without restriction, including without limitation the
    7  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
    8  * sell copies of the Software, and to permit persons to whom the Software is
    9  * furnished to do so, subject to the following conditions:
   10  *
   11  * The above copyright notice and this permission notice shall be included in
   12  * all copies or substantial portions of the Software.
   13  *
   14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   20  * DEALINGS IN THE SOFTWARE.
   21  * 
   22  * Xen port written by:
   23  * - Simon 'Horms' Horman <horms@verge.net.au>
   24  * - Magnus Damm <magnus@valinux.co.jp>
   25  */
   26 
   27 #ifndef _XEN_PUBLIC_KEXEC_H
   28 #define _XEN_PUBLIC_KEXEC_H
   29 
   30 
   31 /* This file describes the Kexec / Kdump hypercall interface for Xen.
   32  *
   33  * Kexec under vanilla Linux allows a user to reboot the physical machine 
   34  * into a new user-specified kernel. The Xen port extends this idea
   35  * to allow rebooting of the machine from dom0. When kexec for dom0
   36  * is used to reboot,  both the hypervisor and the domains get replaced
   37  * with some other kernel. It is possible to kexec between vanilla
   38  * Linux and Xen and back again. Xen to Xen works well too.
   39  *
   40  * The hypercall interface for kexec can be divided into three main
   41  * types of hypercall operations:
   42  *
   43  * 1) Range information:
   44  *    This is used by the dom0 kernel to ask the hypervisor about various 
   45  *    address information. This information is needed to allow kexec-tools 
   46  *    to fill in the ELF headers for /proc/vmcore properly.
   47  *
   48  * 2) Load and unload of images:
   49  *    There are no big surprises here, the kexec binary from kexec-tools
   50  *    runs in userspace in dom0. The tool loads/unloads data into the
   51  *    dom0 kernel such as new kernel, initramfs and hypervisor. When
   52  *    loaded the dom0 kernel performs a load hypercall operation, and
   53  *    before releasing all page references the dom0 kernel calls unload.
   54  *
   55  * 3) Kexec operation:
   56  *    This is used to start a previously loaded kernel.
   57  */
   58 
   59 #include "xen.h"
   60 
   61 #if defined(__i386__) || defined(__x86_64__)
   62 #define KEXEC_XEN_NO_PAGES 17
   63 #endif
   64 
   65 /*
   66  * Prototype for this hypercall is:
   67  *  int kexec_op(int cmd, void *args)
   68  * @cmd  == KEXEC_CMD_... 
   69  *          KEXEC operation to perform
   70  * @args == Operation-specific extra arguments (NULL if none).
   71  */
   72 
   73 /*
   74  * Kexec supports two types of operation:
   75  * - kexec into a regular kernel, very similar to a standard reboot
   76  *   - KEXEC_TYPE_DEFAULT is used to specify this type
   77  * - kexec into a special "crash kernel", aka kexec-on-panic
   78  *   - KEXEC_TYPE_CRASH is used to specify this type
   79  *   - parts of our system may be broken at kexec-on-panic time
   80  *     - the code should be kept as simple and self-contained as possible
   81  */
   82 
   83 #define KEXEC_TYPE_DEFAULT 0
   84 #define KEXEC_TYPE_CRASH   1
   85 
   86 
   87 /* The kexec implementation for Xen allows the user to load two
   88  * types of kernels, KEXEC_TYPE_DEFAULT and KEXEC_TYPE_CRASH.
   89  * All data needed for a kexec reboot is kept in one xen_kexec_image_t
   90  * per "instance". The data mainly consists of machine address lists to pages
   91  * together with destination addresses. The data in xen_kexec_image_t
   92  * is passed to the "code page" which is one page of code that performs
   93  * the final relocations before jumping to the new kernel.
   94  */
   95  
   96 typedef struct xen_kexec_image {
   97 #if defined(__i386__) || defined(__x86_64__)
   98     unsigned long page_list[KEXEC_XEN_NO_PAGES];
   99 #endif
  100 #if defined(__ia64__)
  101     unsigned long reboot_code_buffer;
  102 #endif
  103     unsigned long indirection_page;
  104     unsigned long start_address;
  105 } xen_kexec_image_t;
  106 
  107 /*
  108  * Perform kexec having previously loaded a kexec or kdump kernel
  109  * as appropriate.
  110  * type == KEXEC_TYPE_DEFAULT or KEXEC_TYPE_CRASH [in]
  111  */
  112 #define KEXEC_CMD_kexec                 0
  113 typedef struct xen_kexec_exec {
  114     int type;
  115 } xen_kexec_exec_t;
  116 
  117 /*
  118  * Load/Unload kernel image for kexec or kdump.
  119  * type  == KEXEC_TYPE_DEFAULT or KEXEC_TYPE_CRASH [in]
  120  * image == relocation information for kexec (ignored for unload) [in]
  121  */
  122 #define KEXEC_CMD_kexec_load            1
  123 #define KEXEC_CMD_kexec_unload          2
  124 typedef struct xen_kexec_load {
  125     int type;
  126     xen_kexec_image_t image;
  127 } xen_kexec_load_t;
  128 
  129 #define KEXEC_RANGE_MA_CRASH      0 /* machine address and size of crash area */
  130 #define KEXEC_RANGE_MA_XEN        1 /* machine address and size of Xen itself */
  131 #define KEXEC_RANGE_MA_CPU        2 /* machine address and size of a CPU note */
  132 #define KEXEC_RANGE_MA_XENHEAP    3 /* machine address and size of xenheap
  133                                      * Note that although this is adjacent
  134                                      * to Xen it exists in a separate EFI
  135                                      * region on ia64, and thus needs to be
  136                                      * inserted into iomem_machine separately */
  137 #define KEXEC_RANGE_MA_BOOT_PARAM 4 /* machine address and size of
  138                                      * the ia64_boot_param */
  139 #define KEXEC_RANGE_MA_EFI_MEMMAP 5 /* machine address and size of
  140                                      * of the EFI Memory Map */
  141 #define KEXEC_RANGE_MA_VMCOREINFO 6 /* machine address and size of vmcoreinfo */
  142 
  143 /*
  144  * Find the address and size of certain memory areas
  145  * range == KEXEC_RANGE_... [in]
  146  * nr    == physical CPU number (starting from 0) if KEXEC_RANGE_MA_CPU [in]
  147  * size  == number of bytes reserved in window [out]
  148  * start == address of the first byte in the window [out]
  149  */
  150 #define KEXEC_CMD_kexec_get_range       3
  151 typedef struct xen_kexec_range {
  152     int range;
  153     int nr;
  154     unsigned long size;
  155     unsigned long start;
  156 } xen_kexec_range_t;
  157 
  158 #endif /* _XEN_PUBLIC_KEXEC_H */
  159 
  160 /*
  161  * Local variables:
  162  * mode: C
  163  * c-set-style: "BSD"
  164  * c-basic-offset: 4
  165  * tab-width: 4
  166  * indent-tabs-mode: nil
  167  * End:
  168  */

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