ref: a654b94db8a3574b7a774edfd77b8612c0b642cd
dir: /sys/src/9/xen/xen-public/kexec.h/
/******************************************************************************
* kexec.h - Public portion
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Xen port written by:
* - Simon 'Horms' Horman <[email protected]>
* - Magnus Damm <[email protected]>
*/
#ifndef _XEN_PUBLIC_KEXEC_H
#define _XEN_PUBLIC_KEXEC_H
/* This file describes the Kexec / Kdump hypercall interface for Xen.
*
* Kexec under vanilla Linux allows a user to reboot the physical machine
* into a new user-specified kernel. The Xen port extends this idea
* to allow rebooting of the machine from dom0. When kexec for dom0
* is used to reboot, both the hypervisor and the domains get replaced
* with some other kernel. It is possible to kexec between vanilla
* Linux and Xen and back again. Xen to Xen works well too.
*
* The hypercall interface for kexec can be divided into three main
* types of hypercall operations:
*
* 1) Range information:
* This is used by the dom0 kernel to ask the hypervisor about various
* address information. This information is needed to allow kexec-tools
* to fill in the ELF headers for /proc/vmcore properly.
*
* 2) Load and unload of images:
* There are no big surprises here, the kexec binary from kexec-tools
* runs in userspace in dom0. The tool loads/unloads data into the
* dom0 kernel such as new kernel, initramfs and hypervisor. When
* loaded the dom0 kernel performs a load hypercall operation, and
* before releasing all page references the dom0 kernel calls unload.
*
* 3) Kexec operation:
* This is used to start a previously loaded kernel.
*/
#include "xen.h"
#if defined(__i386__) || defined(__x86_64__)
#define KEXEC_XEN_NO_PAGES 17
#endif
/*
* Prototype for this hypercall is:
* int kexec_op(int cmd, void *args)
* @cmd == KEXEC_CMD_...
* KEXEC operation to perform
* @args == Operation-specific extra arguments (NULL if none).
*/
/*
* Kexec supports two types of operation:
* - kexec into a regular kernel, very similar to a standard reboot
* - KEXEC_TYPE_DEFAULT is used to specify this type
* - kexec into a special "crash kernel", aka kexec-on-panic
* - KEXEC_TYPE_CRASH is used to specify this type
* - parts of our system may be broken at kexec-on-panic time
* - the code should be kept as simple and self-contained as possible
*/
#define KEXEC_TYPE_DEFAULT 0
#define KEXEC_TYPE_CRASH 1
/* The kexec implementation for Xen allows the user to load two
* types of kernels, KEXEC_TYPE_DEFAULT and KEXEC_TYPE_CRASH.
* All data needed for a kexec reboot is kept in one xen_kexec_image_t
* per "instance". The data mainly consists of machine address lists to pages
* together with destination addresses. The data in xen_kexec_image_t
* is passed to the "code page" which is one page of code that performs
* the final relocations before jumping to the new kernel.
*/
typedef struct xen_kexec_image {
#if defined(__i386__) || defined(__x86_64__)
unsigned long page_list[KEXEC_XEN_NO_PAGES];
#endif
unsigned long indirection_page;
unsigned long start_address;
} xen_kexec_image_t;
/*
* Perform kexec having previously loaded a kexec or kdump kernel
* as appropriate.
* type == KEXEC_TYPE_DEFAULT or KEXEC_TYPE_CRASH [in]
*/
#define KEXEC_CMD_kexec 0
typedef struct xen_kexec_exec {
int type;
} xen_kexec_exec_t;
/*
* Load/Unload kernel image for kexec or kdump.
* type == KEXEC_TYPE_DEFAULT or KEXEC_TYPE_CRASH [in]
* image == relocation information for kexec (ignored for unload) [in]
*/
#define KEXEC_CMD_kexec_load 1
#define KEXEC_CMD_kexec_unload 2
typedef struct xen_kexec_load {
int type;
xen_kexec_image_t image;
} xen_kexec_load_t;
#define KEXEC_RANGE_MA_CRASH 0 /* machine address and size of crash area */
#define KEXEC_RANGE_MA_XEN 1 /* machine address and size of Xen itself */
#define KEXEC_RANGE_MA_CPU 2 /* machine address and size of a CPU note */
#define KEXEC_RANGE_MA_XENHEAP 3 /* machine address and size of xenheap
* Note that although this is adjacent
* to Xen it exists in a separate EFI
* region on ia64, and thus needs to be
* inserted into iomem_machine separately */
#define KEXEC_RANGE_MA_BOOT_PARAM 4 /* Obsolete: machine address and size of
* the ia64_boot_param */
#define KEXEC_RANGE_MA_EFI_MEMMAP 5 /* machine address and size of
* of the EFI Memory Map */
#define KEXEC_RANGE_MA_VMCOREINFO 6 /* machine address and size of vmcoreinfo */
/*
* Find the address and size of certain memory areas
* range == KEXEC_RANGE_... [in]
* nr == physical CPU number (starting from 0) if KEXEC_RANGE_MA_CPU [in]
* size == number of bytes reserved in window [out]
* start == address of the first byte in the window [out]
*/
#define KEXEC_CMD_kexec_get_range 3
typedef struct xen_kexec_range {
int range;
int nr;
unsigned long size;
unsigned long start;
} xen_kexec_range_t;
#endif /* _XEN_PUBLIC_KEXEC_H */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/