stand/efi: Add a 32-bit variant of libefi

In preparation for supporting 64-bit machines with 32-bit UEFI firmware,
add a 32-bit variant of libefi since we need to compile both the 64-bit
version and the 32-bit version at the same time.

Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1098

stand/Makefile

@@ -66,6 +66,7 @@ SUBDIR_DEPEND_${MACHINE}+=	libofw
 SUBDIR+=${_x}
 .if defined(LIB32LIST) && ${LIB32LIST:M${_x}}
 SUBDIR+=${_x}32
+INTERP_DEPENDS+=${_x}32
 .endif
 .if ${_x} != "libsa"
 SUBDIR_DEPEND_${_x}+=	libsa

stand/defs.mk

@@ -40,7 +40,14 @@ WARNS?=		1
 BOOTSRC=	${SRCTOP}/stand
 EFISRC=		${BOOTSRC}/efi
 EFIINC=		${EFISRC}/include
+# For amd64, there's a bit of mixed bag. Some of the tree (i386, lib*32) is
+# built 32-bit and some 64-bit (lib*, efi). Centralize all the 32-bit magic here
+# and activate it when DO32 is explicitly defined to be 1.
+.if ${MACHINE_ARCH} == "amd64" && ${DO32:U0} == 1
+EFIINCMD=	${EFIINC}/i386
+.else
 EFIINCMD=	${EFIINC}/${MACHINE}
+.endif
 FDTSRC=		${BOOTSRC}/fdt
 FICLSRC=	${BOOTSRC}/ficl
 LDRSRC=		${BOOTSRC}/common
@@ -130,9 +137,6 @@ CFLAGS+=	-m32 -mcpu=powerpc -mbig-endian
 CFLAGS+=	-m32 -mcpu=powerpc -mlittle-endian
 .endif
 
-# For amd64, there's a bit of mixed bag. Some of the tree (i386, lib*32) is
-# build 32-bit and some 64-bit (lib*, efi). Centralize all the 32-bit magic here
-# and activate it when DO32 is explicitly defined to be 1.
 .if ${MACHINE_ARCH} == "amd64" && ${DO32:U0} == 1
 CFLAGS+=	-m32
 # LD_FLAGS is passed directly to ${LD}, not via ${CC}:

stand/efi/Makefile

@@ -3,6 +3,7 @@ NO_OBJ=t
 .include <bsd.init.mk>
 
 SUBDIR.yes+=	libefi
+SUBDIR.${MK_LOADER_IA32}+=	libefi32
 SUBDIR.${MK_FDT}+=	fdt
 SUBDIR.yes+=	.WAIT
 

stand/efi/libefi32/Makefile

@@ -0,0 +1,4 @@
+DO32=1
+
+.PATH:	${.CURDIR}/../libefi
+.include "${.CURDIR}/../libefi/Makefile"