1.\" $OpenBSD: octboot.4,v 1.2 2020/10/10 10:11:54 visa Exp $ 2.\" 3.\" Copyright (c) 2020 Visa Hankala 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: October 10 2020 $ 18.Dt OCTBOOT 4 octeon 19.Os 20.Sh NAME 21.Nm octboot 22.Nd kernel boot interface 23.Sh SYNOPSIS 24.Cd "pseudo-device octboot" 25.Sh DESCRIPTION 26The 27.Nm 28driver provides an 29.Xr ioctl 2 30interface for booting into another kernel from the currently running kernel. 31.Sh IOCTL INTERFACE 32.Nm 33provides the following 34.Xr ioctl 2 35commands, available through 36.In machine/octboot.h : 37.Bl -tag -width xxxx 38.It Dv OBIOC_GETROOTDEV Fa "char rootdev[PATH_MAX]" 39Get the name of the current root device. 40.It Dv OBIOC_KEXEC "struct octboot_kexec_args *args" 41Boot into the given kernel image. 42.Bd -literal 43struct octboot_kexec_args { 44 char *kimg; 45 size_t klen; 46 char *argv[OCTBOOT_MAX_ARGS]; 47}; 48.Ed 49.El 50.Sh FILES 51.Bl -tag -width /dev/octboot -compact 52.It Pa /dev/octboot 53boot interface device. 54.El 55.Sh SEE ALSO 56.Xr ioctl 2 , 57.Xr intro 4 58.Sh HISTORY 59The 60.Nm 61driver first appeared in 62.Ox 6.6 . 63