Port MBR.

Patch by Antoine LECA.

sys/arch/i386/stand/mbr/Makefile.mbr

@@ -1,6 +1,9 @@
-#	$NetBSD: Makefile.mbr,v 1.18 2011/05/20 15:05:02 joerg Exp $
+#	$NetBSD: Makefile.mbr,v 1.17 2009/11/20 17:28:19 dsl Exp $
 
-S=		${.CURDIR}/../../../../..
+.if !defined(COMPILER_TYPE) || ${COMPILER_TYPE} != "gnu"
+CC:=clang
+COMPILER_TYPE:=gnu
+.endif
 
 NOMAN=		# defined
 
@@ -16,6 +19,8 @@ PIE_AFLAGS=
 .include <bsd.own.mk>
 
 STRIPFLAG=	# override
+TOOL_SED?=	sed
+NM?=		nm
 
 SRCS?=		mbr.S
 
@@ -24,30 +29,33 @@ BINMODE=	444
 
 .PATH:		${.CURDIR}/..
 
+LOADADDR=	0x8800
+
 LDFLAGS+=	-nostdlib -Wl,-e,start
-CPPFLAGS+=	-I. -I${.CURDIR}/../../lib -I${S}
+CPPFLAGS+=	-I. -I${.CURDIR}/../../lib -DLOADADDR=${LOADADDR}
 
 .if ${MACHINE_ARCH} == "x86_64"
 LDFLAGS+=	-Wl,-m,elf_i386
 AFLAGS+=	-m32
 .endif
 
-BUILDSYMLINKS+=	$S/arch/i386/include	machine \
-		$S/arch/x86/include	x86
+AFLAGS+= "-Wa,--divide"
 
-DPSRCS+=	machine x86
+# NetBSD can be compiled from a foreign host, MINIX do not. So commented out.
+# Make sys/ a local thing for benefit of cross-compilers
+#S=		${.CURDIR}/../../../../..
+#CPPFLAGS+=	-I${S}
+# And same for machine/; need a bit more work because of symlink
+#BUILDSYMLINKS+=	$S/arch/i386/include	machine \
+#		$S/arch/x86/include	x86
+#DPSRCS+=	machine x86
 
 CLEANFILES+=	${PROG}.tmp
 
-LOADADDR=	0x8800
-
-AFLAGS.mbr.S= ${${ACTIVE_CC} == "clang":?-no-integrated-as:}
-AFLAGS.gpt.S= ${${ACTIVE_CC} == "clang":?-no-integrated-as:}
-
 ${PROG}: ${OBJS}
 	${_MKTARGET_LINK}
 	${CC} -o ${PROG}.tmp ${LDFLAGS} -Wl,-Ttext,${LOADADDR} ${OBJS}
-	@ set -- $$( ${NM} -t d ${PROG}.tmp | grep '\<mbr_space\>' \
+	@ set -- $$( ${NM} -t d ${PROG}.tmp | grep 'mbr_space' \
 		    | ${TOOL_SED} 's/^0*//'  ); \
 		echo "#### There are $$1 free bytes in ${PROG}"
 	${OBJCOPY} -O binary ${PROG}.tmp ${PROG}

sys/arch/i386/stand/mbr/gptmbr/Makefile

@@ -4,6 +4,7 @@ PROG=		gptmbr.bin
 SRCS=		gptmbr.S
 
 AFLAGS.gptmbr.S= ${${ACTIVE_CC} == "clang":?-no-integrated-as:}
+AFLAGS+= "-Wa,--divide"
 
 .include <../Makefile.mbr>
 

sys/arch/i386/stand/mbr/mbr.S

@@ -515,7 +515,14 @@ do_read:
 */
 	movl	%ebp, %esi
 	pop	%dx			/* recover drive # */
+#ifdef __minix
+	/* There some bug in MINIX tools, which causes to
+	 * generate wrong code for "jmp BOOTADDR" (relocation issue).
+	 */
+	jmp	start - LOADADDR + BOOTADDR
+#else
 	jmp	BOOTADDR
+#endif
 
 
 #ifndef NO_CHS

sys/arch/i386/stand/mbr/mbr_com0_9600/Makefile

@@ -5,4 +5,6 @@ AFLAGS+= -DBOOTSEL -DBOOT_EXTENDED -DCOM_PORT=0 -DCOM_BAUD=9600
 AFLAGS+= -DTERSE_ERROR -DNO_CHS
 AFLAGS+= "-DBOOTSEL_FLAGS=MBR_BS_ACTIVE|MBR_BS_EXTLBA|MBR_BS_ASCII"
 
+AFLAGS+= "-Wa,--divide"
+
 .include <../Makefile.mbr>