From 5ea3094e6a755b931d144f30a824e2fed10a8a33 Mon Sep 17 00:00:00 2001
From: Brooks Davis <brooks@FreeBSD.org>
Date: Mon, 13 Jun 2022 18:35:40 +0100
Subject: [PATCH] amd64: -m32 support for machine/md_var.h

Install the i386 md_var.h under /usr/include/i386 on amd64 and include
when targeting i386.

This is a mostly kernel-only header required by procstat's ZFS support.
It is pulled in by the i386 machine/counter.h.

Reviewed by:	jhb, imp
---
 include/i386/Makefile      | 1 +
 sys/amd64/include/md_var.h | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/include/i386/Makefile b/include/i386/Makefile
index 58c619f4dbd..b5f5a23eb90 100644
--- a/include/i386/Makefile
+++ b/include/i386/Makefile
@@ -15,6 +15,7 @@ INCS=	\
 # This should be fixed.
 INCS+=	\
 	counter.h \
+	md_var.h \
 	pcpu.h \
 	pcpu_aux.h
 INCSDIR=	${INCLUDEDIR}/i386
diff --git a/sys/amd64/include/md_var.h b/sys/amd64/include/md_var.h
index 53358600dc7..196836b5bae 100644
--- a/sys/amd64/include/md_var.h
+++ b/sys/amd64/include/md_var.h
@@ -31,6 +31,10 @@
  * $FreeBSD$
  */
 
+#ifdef __i386__
+#include <i386/md_var.h>
+#else /* !__i386__ */
+
 #ifndef _MACHINE_MD_VAR_H_
 #define	_MACHINE_MD_VAR_H_
 
@@ -95,3 +99,5 @@ int	set_fpcontext(struct thread *td, struct __mcontext *mcp,
 	    char *xfpustate, size_t xfpustate_len);
 
 #endif /* !_MACHINE_MD_VAR_H_ */
+
+#endif /* __i386__ */