kboot: Split out powerpc build

Split the powerpc specific parts into kboot/arch/powerpc64. More may be
needed here.

Sponsored by:		Netflix
Reviewed by:		jhibbits
Differential Revision:	https://reviews.freebsd.org/D33514

stand/Makefile

@@ -80,8 +80,10 @@ SUBDIR_DEPEND_forth+=	ficl
 SUBDIR_DEPEND_lua+=	liblua
 
 SUBDIR_DEPEND_efi+=	${INTERP_DEPENDS}
+SUBDIR_DEPEND_kboot+=	${INTERP_DEPENDS}
 .if ${MK_FDT} != "no"
 SUBDIR_DEPEND_efi+=	fdt
+SUBDIR_DEPEND_kboot+=	fdt
 .endif
 
 SUBDIR_DEPEND_uboot+=	${INTERP_DEPENDS}

stand/kboot/Makefile

@@ -17,30 +17,23 @@ NEWVERSWHAT=	"kboot loader" ${MACHINE_ARCH}
 INSTALLFLAGS=	-b
 
 # Architecture-specific loader code
-SRCS=		conf.c vers.c main.c ppc64_elf_freebsd.c
-SRCS+=		host_syscall.S hostcons.c hostdisk.c kerneltramp.S kbootfdt.c
-SRCS+=		ucmpdi2.c gfx_fb_stub.c
+SRCS=		vers.c main.c hostcons.c hostdisk.c kbootfdt.c gfx_fb_stub.c
 
 CFLAGS.gfx_fb_stub.c += -I${SRCTOP}/contrib/pnglite -I${SRCTOP}/sys/teken
 
 .include	"${BOOTSRC}/fdt.mk"
 
-CFLAGS+=	-mcpu=powerpc64
+.PATH:	${.CURDIR}/arch/${MACHINE_ARCH}
+.include "${.CURDIR}/arch/${MACHINE_ARCH}/Makefile.inc"
 
 # Always add MI sources
 .include	"${BOOTSRC}/loader.mk"
 .PATH:		${SYSDIR}/libkern
+CFLAGS+=	-I${.CURDIR} -I${.CURDIR}/arch/${MACHINE_ARCH}
 
-CFLAGS+=	-Wall -DAIM
-# load address. set in linker script
-RELOC?=		0x0
-CFLAGS+=	-DRELOC=${RELOC}
-
-LDFLAGS=	-nostdlib -static -T ${.CURDIR}/ldscript.powerpc
+CFLAGS+=	-Wall
 
 DPADD=		${LDR_INTERP} ${LIBOFW} ${LIBFDT} ${LIBSA}
 LDADD=		${LDR_INTERP} ${LIBOFW} ${LIBFDT} ${LIBSA}
 
-MK_PIE=		no
-
 .include <bsd.prog.mk>

stand/kboot/arch/powerpc64/Makefile.inc

@@ -0,0 +1,14 @@
+CFLAGS+=	-mcpu=powerpc64
+
+SRCS+=		conf.c ppc64_elf_freebsd.c host_syscall.S kerneltramp.S
+SRCS+=		ucmpdi2.c
+
+# load address. set in linker script
+RELOC?=		0x0
+CFLAGS+=	-DRELOC=${RELOC}
+
+LDFLAGS=	-nostdlib -static -T ${.CURDIR}/arch/${MACHINE_ARCH}/ldscript.powerpc
+
+MK_PIE=		no
+# Maybe bogus?
+CFLAGS+=	 -DAIM