D25183.diff
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	Index: head/sys/riscv/riscv/sbi.c
	===================================================================
	--- head/sys/riscv/riscv/sbi.c
	+++ head/sys/riscv/riscv/sbi.c
	@@ -29,8 +29,11 @@
	__FBSDID("$FreeBSD$");

	#include <sys/param.h>
	+#include <sys/kernel.h>
	#include <sys/systm.h>
	#include <sys/types.h>
	+#include <sys/eventhandler.h>
	+#include <sys/reboot.h>

	#include <machine/md_var.h>
	#include <machine/sbi.h>
	@@ -80,6 +83,13 @@
	return (SBI_CALL0(SBI_EXT_ID_BASE, SBI_BASE_GET_MIMPID));
	}

	+static void
	+sbi_shutdown_final(void *dummy __unused, int howto)
	+{
	+ if ((howto & RB_POWEROFF) != 0)
	+ sbi_shutdown();
	+}
	+
	void
	sbi_print_version(void)
	{
	@@ -187,3 +197,12 @@
	KASSERT(sbi_probe_extension(SBI_SHUTDOWN) != 0,
	("SBI doesn't implement sbi_shutdown()"));
	}
	+
	+static void
	+sbi_late_init(void *dummy __unused)
	+{
	+ EVENTHANDLER_REGISTER(shutdown_final, sbi_shutdown_final, NULL,
	+ SHUTDOWN_PRI_LAST);
	+}
	+
	+SYSINIT(sbi, SI_SUB_KLD, SI_ORDER_ANY, sbi_late_init, NULL);