Build system: Fixes #2: Add multi-platform support

Move all explicit platform or architecture specific references
into a new platform.mk file that is defined for each platform.

Change-Id: I9d6320d1ba957e0cc8d9b316b3578132331fa428
Signed-off-by: Ryan Harkin <ryan.harkin@linaro.org>

8 files changed, 206 insertions, 84 deletions

diff --git a/Makefile b/Makefile
index 4e88308..ee778e9 100644
--- a/Makefile
+++ b/Makefile
@@ -51,37 +51,57 @@ else
 endif
 
 BL_COMMON_OBJS		:=	misc_helpers.o cache_helpers.o tlb_helpers.o		\
-				semihosting_call.o mmio.o pl011.o semihosting.o		\
-				std.o bl_common.o platform_helpers.o sysreg_helpers.o
-
-ARCH 			:=	aarch64
-PLAT			:=	fvp
-
-BUILD_BASE:=./build
-BUILD:=${BUILD_BASE}/${PLAT}/${BUILD_TYPE}
-BUILD_BL1:=${BUILD}/bl1
-BUILD_BL2:=${BUILD}/bl2
-BUILD_BL31:=${BUILD}/bl31
-BUILD_DIRS:=${BUILD_BL1} ${BUILD_BL2} ${BUILD_BL31}
-
-all: bl1 bl2 bl31
-
-$(info Including bl1.mk)
-include bl1/bl1.mk
+				std.o bl_common.o platform_helpers.o
+ARCH 			?=	aarch64
+
+# By default, build all platforms available
+PLAT			?=	all
+
+BUILD_BASE		:=	./build
+BUILD_PLAT		:=	${BUILD_BASE}/${PLAT}/${BUILD_TYPE}
+BUILD_BL1		:=	${BUILD_PLAT}/bl1
+BUILD_BL2		:=	${BUILD_PLAT}/bl2
+BUILD_BL31		:=	${BUILD_PLAT}/bl31
+BUILD_DIRS		:=	${BUILD_BL1} ${BUILD_BL2} ${BUILD_BL31}
+
+PLATFORMS		:=	$(shell ls -I common plat/)
+ifeq (${PLAT},)
+  $(error "Error: Unknown platform. Please use PLAT=<platform name> to specify the platform.")
+endif
+ifeq ($(findstring ${PLAT},${PLATFORMS} all),)
+  $(error "Error: Invalid platform. The following platforms are available: ${PLATFORMS}")
+endif
 
-$(info Including bl2.mk)
-include bl2/bl2.mk
+ifeq (${PLAT},all)
+all: ${PLATFORMS}
+else
+all: msg_start bl1 bl2 bl31
+endif
 
-$(info Including bl31.mk)
-include bl31/bl31.mk
+msg_start:
+	@echo "Building ${PLAT}"
+
+${PLATFORMS}:
+	${MAKE} PLAT=$@ all
+
+ifneq (${PLAT},all)
+  $(info Including ${PLAT}/platform.mk)
+  include plat/${PLAT}/platform.mk
+  $(info Including bl1.mk)
+  include bl1/bl1.mk
+  $(info Including bl2.mk)
+  include bl2/bl2.mk
+  $(info Including bl31.mk)
+  include bl31/bl31.mk
+endif
 
-.PHONY:			dump clean realclean distclean bl1 bl2 bl31
+.PHONY:			all msg_start ${PLATFORMS} dump clean realclean distclean bl1 bl2 bl31
 .SUFFIXES:
 
 
-BL1_OBJS		:= 	$(addprefix ${BUILD_BL1}/,${BL1_OBJS} ${BL_COMMON_OBJS})
-BL2_OBJS		:= 	$(addprefix ${BUILD_BL2}/,${BL2_OBJS} ${BL_COMMON_OBJS})
-BL31_OBJS		:= 	$(addprefix ${BUILD_BL31}/,${BL31_OBJS} ${BL_COMMON_OBJS})
+BL1_OBJS		:= 	$(addprefix ${BUILD_BL1}/,${BL1_OBJS} ${BL_COMMON_OBJS} ${PLAT_BL_COMMON_OBJS})
+BL2_OBJS		:= 	$(addprefix ${BUILD_BL2}/,${BL2_OBJS} ${BL_COMMON_OBJS} ${PLAT_BL_COMMON_OBJS})
+BL31_OBJS		:= 	$(addprefix ${BUILD_BL31}/,${BL31_OBJS} ${BL_COMMON_OBJS} ${PLAT_BL_COMMON_OBJS})
 BL1_MAPFILE		:= 	$(addprefix ${BUILD_BL1}/,${BL1_MAPFILE})
 BL2_MAPFILE		:= 	$(addprefix ${BUILD_BL2}/,${BL2_MAPFILE})
 BL31_MAPFILE		:= 	$(addprefix ${BUILD_BL31}/,${BL31_MAPFILE})
@@ -89,12 +109,10 @@ BL1_LINKERFILE		:= 	$(addprefix ${BUILD_BL1}/,${BL1_LINKERFILE})
 BL2_LINKERFILE		:= 	$(addprefix ${BUILD_BL2}/,${BL2_LINKERFILE})
 BL31_LINKERFILE		:= 	$(addprefix ${BUILD_BL31}/,${BL31_LINKERFILE})
 
-INCLUDES		+=	-Ilib/include/ -Iinclude/aarch64/ -Iinclude/	\
-				-Idrivers/arm/interconnect/cci-400/		\
-				-Idrivers/arm/peripherals/pl011/ 		\
-				-Iplat/fvp -Idrivers/power			\
+INCLUDES		+=	-Ilib/include/ -Iinclude/${ARCH}/ -Iinclude/	\
 				-Iarch/system/gic -Icommon/psci			\
-				-Iinclude/stdlib -Iinclude/stdlib/sys
+				-Iinclude/stdlib -Iinclude/stdlib/sys		\
+				-Iplat/${PLAT} ${PLAT_INCLUDES}
 
 ASFLAGS			+= 	-nostdinc -ffreestanding -Wa,--fatal-warnings	\
 				-mgeneral-regs-only -D__ASSEMBLY__ ${INCLUDES}
@@ -133,13 +151,18 @@ NM			:=	${CROSS_COMPILE}nm
 PP			:=	${CROSS_COMPILE}gcc -E ${CFLAGS}
 
 
-bl1:			${BUILD_BL1} ${BUILD}/bl1.bin
-bl2:			${BUILD_BL2} ${BUILD}/bl2.bin
-bl31:			${BUILD_BL31} ${BUILD}/bl31.bin
+bl1:			${BUILD_BL1} ${BUILD_PLAT}/bl1.bin
+bl2:			${BUILD_BL2} ${BUILD_PLAT}/bl2.bin
+bl31:			${BUILD_BL31} ${BUILD_PLAT}/bl31.bin
 
+ifeq (${PLAT},all)
+  ifeq (${MAKECMDGOALS},clean)
+    $(error "Please select a platform with PLAT=<platform>. You can use 'make distclean' to clean up all platform builds")
+  endif
+endif
 clean:
 			@echo "  CLEAN"
-			${Q}rm -rf ${BUILD}
+			${Q}rm -rf ${BUILD_PLAT}
 
 realclean distclean:
 			@echo "  REALCLEAN"
@@ -180,15 +203,15 @@ ${BUILD_BL31}/%.o:	%.c
 			${Q}${CC} ${CFLAGS} -c $< -o $@
 
 ${BUILD_BL1}/%.ld:	%.ld.S
-			@echo "  LDS      $<"
+			@echo "  PP      $<"
 			${Q}${AS} ${ASFLAGS} -P -E $< -o $@
 
 ${BUILD_BL2}/%.ld:	%.ld.S
-			@echo "  LDS      $<"
+			@echo "  PP      $<"
 			${Q}${AS} ${ASFLAGS} -P -E $< -o $@
 
 ${BUILD_BL31}/%.ld:	%.ld.S
-			@echo "  LDS      $<"
+			@echo "  PP      $<"
 			${Q}${AS} ${ASFLAGS} -P -E $< -o $@
 
 
@@ -204,19 +227,22 @@ ${BUILD_BL31}/bl31.elf:	${BL31_OBJS} ${BL31_LINKERFILE}
 			@echo "  LD      $@"
 			${Q}${LD} -o $@ ${LDFLAGS} ${BL31_LDFLAGS} ${BL31_OBJS}
 
-${BUILD}/bl1.bin:	${BUILD_BL1}/bl1.elf
+${BUILD_PLAT}/bl1.bin:	${BUILD_BL1}/bl1.elf
+			@echo "  BIN     $@"
 			${Q}${OC} -O binary $< $@
 			@echo
 			@echo "Built $@ successfully"
 			@echo
 
-${BUILD}/bl2.bin:	${BUILD_BL2}/bl2.elf
+${BUILD_PLAT}/bl2.bin:	${BUILD_BL2}/bl2.elf
+			@echo "  BIN     $@"
 			${Q}${OC} -O binary $< $@
 			@echo
 			@echo "Built $@ successfully"
 			@echo
 
-${BUILD}/bl31.bin:	${BUILD_BL31}/bl31.elf
+${BUILD_PLAT}/bl31.bin:	${BUILD_BL31}/bl31.elf
+			@echo "  BIN     $@"
 			${Q}${OC} -O binary $< $@
 			@echo
 			@echo "Built $@ successfully"
diff --git a/acknowledgements.md b/acknowledgements.md
index ef49ca3..a428f2f 100644
--- a/acknowledgements.md
+++ b/acknowledgements.md
@@ -3,7 +3,7 @@ Contributor Acknowledgements
 
 Companies
 ---------
-
+Linaro Limited
 
 Individuals
 -----------
diff --git a/bl1/bl1.mk b/bl1/bl1.mk
index 68a7ef7..012967a 100644
--- a/bl1/bl1.mk
+++ b/bl1/bl1.mk
@@ -28,19 +28,21 @@
 # POSSIBILITY OF SUCH DAMAGE.
 #
 
-vpath			%.c	drivers/arm/interconnect/cci-400/ plat/fvp			\
-				plat/fvp/${ARCH} drivers/arm/peripherals/pl011 common/ lib/	\
-				lib/semihosting arch/aarch64/ lib/stdlib
+vpath			%.c	plat/${PLAT} plat/${PLAT}/${ARCH}	\
+				common/ lib/ arch/${ARCH}		\
+				${PLAT_BL1_C_VPATH}
 
-vpath			%.S	arch/${ARCH}/cpu plat/common/aarch64				\
-				plat/fvp/${ARCH} lib/semihosting/aarch64			\
-				include/ lib/arch/aarch64
+vpath			%.S	arch/${ARCH}/cpu plat/common/${ARCH}	\
+				plat/${PLAT}/${ARCH} 			\
+				include/ lib/arch/${ARCH}		\
+				${PLAT_BL1_S_VPATH}
+
+BL1_OBJS		+=	bl1_arch_setup.o \
+				bl1_entrypoint.o \
+				early_exceptions.o \
+				bl1_main.o \
+				cpu_helpers.o
 
-BL1_ASM_OBJS		:=	bl1_entrypoint.o bl1_plat_helpers.o cpu_helpers.o
-BL1_C_OBJS		:=	bl1_main.o cci400.o bl1_plat_setup.o bl1_arch_setup.o	\
-				fvp_common.o fvp_helpers.o early_exceptions.o
 BL1_ENTRY_POINT		:=	reset_handler
 BL1_MAPFILE		:=	bl1.map
 BL1_LINKERFILE		:=	bl1.ld
-
-BL1_OBJS		:= 	$(BL1_C_OBJS) $(BL1_ASM_OBJS)
diff --git a/bl2/bl2.mk b/bl2/bl2.mk
index daa8930..9c43e88 100644
--- a/bl2/bl2.mk
+++ b/bl2/bl2.mk
@@ -28,21 +28,22 @@
 # POSSIBILITY OF SUCH DAMAGE.
 #
 
-vpath			%.c	common/ drivers/arm/interconnect/cci-400/		\
-				drivers/arm/peripherals/pl011 common/ lib/ 		\
-				plat/fvp plat/fvp/${ARCH} lib/semihosting arch/aarch64/	\
-				lib/stdlib
+vpath			%.c	common/ lib/ 		\
+				plat/${PLAT} plat/${PLAT}/${ARCH} arch/${ARCH}	\
+				${PLAT_BL2_C_VPATH}
 
-vpath			%.S	lib/arch/aarch64					\
-				lib/semihosting/aarch64					\
-				include lib/sync/locks/exclusive
+vpath			%.S	lib/arch/${ARCH}			\
+				include lib/sync/locks/exclusive	\
+				${PLAT_BL2_S_VPATH}
 
-BL2_ASM_OBJS		:=	bl2_entrypoint.o spinlock.o
-BL2_C_OBJS		:=	bl2_main.o bl2_plat_setup.o bl2_arch_setup.o fvp_common.o	\
+BL2_OBJS		+=	bl2_entrypoint.o \
+				bl2_arch_setup.o \
+				bl2_main.o \
+				spinlock.o \
 				early_exceptions.o
+
 BL2_ENTRY_POINT		:=	bl2_entrypoint
 BL2_MAPFILE		:=	bl2.map
 BL2_LINKERFILE		:=	bl2.ld
 
-BL2_OBJS		:= 	$(BL2_C_OBJS) $(BL2_ASM_OBJS)
 CFLAGS		        += 	$(DEFINES)
diff --git a/bl31/bl31.mk b/bl31/bl31.mk
index 228e530..e5bacd7 100644
--- a/bl31/bl31.mk
+++ b/bl31/bl31.mk
@@ -28,27 +28,34 @@
 # POSSIBILITY OF SUCH DAMAGE.
 #
 
-vpath			%.c	drivers/arm/interconnect/cci-400/ common/ lib/			\
-				drivers/arm/peripherals/pl011 plat/fvp common/psci		\
-				lib/semihosting arch/aarch64/ lib/stdlib lib/sync/locks/bakery/	\
-				drivers/power/ arch/system/gic/ plat/fvp/aarch64/
+vpath			%.c	common/ lib/ arch/system/gic			\
+				plat/${PLAT} arch/${ARCH} common/psci		\
+				lib/sync/locks/bakery/				\
+				plat/${PLAT}/${ARCH} ${PLAT_BL31_C_VPATH}
 
-vpath			%.S	lib/arch/aarch64 common/psci					\
-				lib/semihosting/aarch64 include/ plat/fvp/${ARCH}		\
-				lib/sync/locks/exclusive plat/common/aarch64/			\
-				arch/system/gic/${ARCH}
+vpath			%.S	lib/arch/${ARCH} common/psci			\
+				include/ plat/${PLAT}/${ARCH}			\
+				lib/sync/locks/exclusive plat/common/${ARCH}	\
+				arch/system/gic/${ARCH}				\
+				${PLAT_BL31_S_VPATH}
 
-BL31_ASM_OBJS		:=	bl31_entrypoint.o runtime_exceptions.o psci_entry.o		\
-				spinlock.o gic_v3_sysregs.o fvp_helpers.o
-BL31_C_OBJS		:=	bl31_main.o bl31_plat_setup.o bl31_arch_setup.o		\
-				exception_handlers.o bakery_lock.o cci400.o 		\
-				fvp_common.o fvp_pm.o fvp_pwrc.o fvp_topology.o		\
-				runtime_svc.o fvp_gic.o gic_v2.o gic_v3.o psci_setup.o	\
-				psci_common.o psci_afflvl_on.o psci_main.o		\
-				psci_afflvl_off.o psci_afflvl_suspend.o
+BL31_OBJS		+=	bl31_arch_setup.o \
+				bl31_entrypoint.o \
+				exception_handlers.o \
+				runtime_exceptions.o \
+				bl31_main.o \
+				psci_entry.o \
+				psci_setup.o \
+				psci_common.o \
+				psci_afflvl_on.o \
+				psci_main.o \
+				psci_afflvl_off.o \
+				psci_afflvl_suspend.o \
+				spinlock.o \
+				gic_v3_sysregs.o \
+				bakery_lock.o \
+				runtime_svc.o
 
 BL31_ENTRY_POINT	:=	bl31_entrypoint
 BL31_MAPFILE		:=	bl31.map
 BL31_LINKERFILE		:=	bl31.ld
-
-BL31_OBJS		:= 	$(BL31_C_OBJS) $(BL31_ASM_OBJS)
diff --git a/docs/change-log.md b/docs/change-log.md
index 7d6d8f6..50e1111 100644
--- a/docs/change-log.md
+++ b/docs/change-log.md
@@ -98,6 +98,11 @@ Detailed changes since last release
     system. The GICv3 re-distributors are probed to work out which
     re-distributor should be used with which CPU.
 
+*   Add multi-platform support to the build system. The user may now specify
+    which platform to build using PLAT=<platform> as part of the make command
+    line.  Default behaviour is to make all platforms.  New platforms are
+    automatically detected by the make file when they are added to the plat
+    directory.
 
 ARM Trusted Firmware - version 0.2
 ==================================
diff --git a/docs/user-guide.md b/docs/user-guide.md
index bc4597f..0358e07 100644
--- a/docs/user-guide.md
+++ b/docs/user-guide.md
@@ -82,7 +82,7 @@ To build the software for the FVPs, follow these steps:
 
 3.  Set the compiler path and build:
 
-        CROSS_COMPILE=<path-to-aarch64-gcc>/bin/aarch64-none-elf- make
+        CROSS_COMPILE=<path-to-aarch64-gcc>/bin/aarch64-none-elf- make PLAT=fvp
 
     By default this produces a release version of the build. To produce a debug
     version instead, refer to the "Debugging options" section below.
@@ -104,7 +104,7 @@ To build the software for the FVPs, follow these steps:
 
 5.  (Optional) Build products for a specific build variant can be removed using:
 
-        make DEBUG=<D> clean
+        make DEBUG=<D> PLAT=fvp clean
 
     ... where `<D>` is `0` or `1`, as specified when building.
 
@@ -117,7 +117,7 @@ To build the software for the FVPs, follow these steps:
 
 To compile a debug version and make the build more verbose use
 
-    CROSS_COMPILE=<path-to-aarch64-gcc>/bin/aarch64-none-elf- make DEBUG=1 V=1
+    CROSS_COMPILE=<path-to-aarch64-gcc>/bin/aarch64-none-elf- make PLAT=fvp DEBUG=1 V=1
 
 AArch64 GCC uses DWARF version 4 debugging symbols by default. Some tools (for
 example DS-5) might not support this and may need an older version of DWARF
@@ -135,7 +135,7 @@ Extra debug options can be passed to the build system by setting `CFLAGS`:
 
     CFLAGS='-O0 -gdwarf-2'                                    \
     CROSS_COMPILE=<path-to-aarch64-gcc>/bin/aarch64-none-elf- \
-    make DEBUG=1 V=1
+    make PLAT=fvp DEBUG=1 V=1
 
 
 NOTE: The Foundation FVP does not provide a debugger interface.
diff --git a/plat/fvp/platform.mk b/plat/fvp/platform.mk
new file mode 100644
index 0000000..94942f5
--- /dev/null
+++ b/plat/fvp/platform.mk
@@ -0,0 +1,81 @@
+#
+# Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# Redistributions of source code must retain the above copyright notice, this
+# list of conditions and the following disclaimer.
+#
+# Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# Neither the name of ARM nor the names of its contributors may be used
+# to endorse or promote products derived from this software without specific
+# prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+PLAT_INCLUDES :=	-Idrivers/arm/interconnect/cci-400/	\
+			-Idrivers/arm/peripherals/pl011/ 	\
+			-Idrivers/power
+
+PLAT_BL1_C_VPATH :=	drivers/arm/interconnect/cci-400/	\
+			drivers/arm/peripherals/pl011		\
+			lib/semihosting				\
+			lib/stdlib
+
+PLAT_BL1_S_VPATH :=	lib/semihosting/${ARCH}
+
+PLAT_BL2_C_VPATH :=	drivers/arm/interconnect/cci-400	\
+			drivers/arm/peripherals/pl011		\
+			lib/stdlib				\
+			lib/semihosting
+
+PLAT_BL2_S_VPATH :=	lib/semihosting/${ARCH}
+
+PLAT_BL31_C_VPATH :=	drivers/arm/interconnect/cci-400	\
+			drivers/arm/peripherals/pl011		\
+			lib/semihosting				\
+			lib/stdlib				\
+			drivers/power
+
+PLAT_BL31_S_VPATH :=	lib/semihosting/${ARCH}
+
+PLAT_BL_COMMON_OBJS :=	semihosting_call.o	\
+			mmio.o			\
+			pl011.o			\
+			semihosting.o		\
+			sysreg_helpers.o
+
+BL1_OBJS +=		bl1_plat_setup.o \
+			bl1_plat_helpers.o \
+			fvp_helpers.o \
+			fvp_common.o \
+			cci400.o
+
+BL2_OBJS +=		bl2_plat_setup.o \
+			fvp_common.o
+
+BL31_OBJS +=		bl31_plat_setup.o \
+			fvp_helpers.o \
+			fvp_common.o \
+			fvp_pm.o \
+			fvp_pwrc.o \
+			fvp_topology.o \
+			fvp_gic.o \
+			cci400.o \
+			gic_v2.o \
+			gic_v3.o