BOOT(3)BOOT(3)NAMEboot - reboot under program control
SYNOPSIS
bind -a #B /dev
/dev/boot
/dev/kexec
/dev/mem
DESCRIPTION
Boot serves a directory containing three files that control a reboot of
the system. The files can only be opened by the host owner (see
eve(10.2)).
Boot is a write-only file that accepts 4 bytes representing a kernel
address, high-order byte first. The system will transfer control to
that address, which is assumed to be the start of low-level reboot
code. There is no return from the write on success or failure.
Kexec is a write-only file to which an uncompressed kernel image can be
written, a chunk at a time. When the file is closed, the system will
transfer control to the start of the image, which again is assumed to
be low-level reboot code.
Mem copies data to and from kernel memory, taking the current file off‐
set as an address therein.
Boot flushes caches as necessary to ensure that writes to kernel memory
through any of these files will be visible when subsequently executed
as instructions.
SOURCE
/os/port/devboot.c
SEE ALSOtftp(2), cons(3)DIAGNOSTICS
Invalid addresses are diagnosed, but otherwise there is no error
return.
BOOT(3)
