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ShengYi Hung 2b74ff5fce ichwd: introduce i6300esbwd watch dog driver

The intel 6300ESB watchdog is a special ICH-based watchdog device with a
different interface.
QEMU implements this watchdog for x86 systems.

This change enables watchdog mode (rather than free-running mode) and
introduces 1 sysctl:
- hw.i6300esbwd.0.locked: locks the watchdog register after the event is
triggered, preventing it from being disabled until a hard reset.

This feature has been tested on a Vultr AMD guest machine and local qemu
machine.

PR:    259673
Approved by:    markj (mentor), lwhsu (mentor)
MFC after:      2 weeks
Sponsored by:   The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D52049

2025-08-25 11:45:24 -04:00

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 .PATH: ${SRCTOP}/sys/dev/ichwd
 KMOD=	ichwd
 SRCS=	i6300esbwd.c ichwd.c device_if.h bus_if.h pci_if.h isa_if.h
 .include <bsd.kmod.mk>