qemu: introducing sub-platforms to qemu platform

This commit change the plat/qemu directory structure into:

`-- plat
    `-- qemu
        |-- common    (files shared with all qemu subplatforms)
        |-- qemu      (original qemu platform)
        |-- qemu_sbsa (new sqemu_sbsa platform)
        |-- subplat1
        `-- subplat2

This opens the possibility of adding new qemu sub-platforms which reuse
existing common platform code. The first platform which will leverage new
structure will be SBSA platform.

Signed-off-by: Radoslaw Biernacki <radoslaw.biernacki@linaro.org>
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Change-Id: Id0d8133e1fffc1b574b69aa2770ebc02bb837a9b

plat/qemu/qemu/platform.mk

@@ -32,16 +32,20 @@ ifeq ($(NEED_BL32),yes)
 $(eval $(call add_define,QEMU_LOAD_BL32))
 endif
 
-PLAT_PATH               :=      plat/qemu/
-PLAT_INCLUDES		:=	-Iplat/qemu/include
+PLAT_QEMU_PATH               :=      plat/qemu/qemu
+PLAT_QEMU_COMMON_PATH        :=      plat/qemu/common
+PLAT_INCLUDES		:=	-Iinclude/plat/arm/common/		\
+				-I${PLAT_QEMU_COMMON_PATH}/include			\
+				-I${PLAT_QEMU_PATH}/include			\
+				-Iinclude/common/tbbr
 
 ifeq (${ARM_ARCH_MAJOR},8)
 PLAT_INCLUDES		+=	-Iinclude/plat/arm/common/${ARCH}
 endif
 
-PLAT_BL_COMMON_SOURCES	:=	plat/qemu/qemu_common.c			  \
-				plat/qemu/qemu_console.c		  \
-				drivers/arm/pl011/${ARCH}/pl011_console.S \
+PLAT_BL_COMMON_SOURCES	:=	${PLAT_QEMU_COMMON_PATH}/qemu_common.c			\
+				${PLAT_QEMU_COMMON_PATH}/qemu_console.c		  \
+				drivers/arm/pl011/${ARCH}/pl011_console.S
 
 include lib/xlat_tables_v2/xlat_tables.mk
 PLAT_BL_COMMON_SOURCES	+=	${XLAT_TABLES_LIB_SRCS}
@@ -59,13 +63,13 @@ ifneq (${TRUSTED_BOARD_BOOT},0)
     BL1_SOURCES		+=	${AUTH_SOURCES}				\
 				bl1/tbbr/tbbr_img_desc.c		\
 				plat/common/tbbr/plat_tbbr.c		\
-				plat/qemu/qemu_trusted_boot.c	     	\
-				$(PLAT_PATH)/qemu_rotpk.S
+				${PLAT_QEMU_COMMON_PATH}/qemu_trusted_boot.c	     	\
+				$(PLAT_QEMU_COMMON_PATH)/qemu_rotpk.S
 
     BL2_SOURCES		+=	${AUTH_SOURCES}				\
 				plat/common/tbbr/plat_tbbr.c		\
-				plat/qemu/qemu_trusted_boot.c	     	\
-				$(PLAT_PATH)/qemu_rotpk.S
+				${PLAT_QEMU_COMMON_PATH}/qemu_trusted_boot.c	     	\
+				$(PLAT_QEMU_COMMON_PATH)/qemu_rotpk.S
 
     ROT_KEY             = $(BUILD_PLAT)/rot_key.pem
     ROTPK_HASH          = $(BUILD_PLAT)/rotpk_sha256.bin
@@ -93,9 +97,9 @@ BL1_SOURCES		+=	drivers/io/io_semihosting.c		\
 				drivers/io/io_memmap.c			\
 				lib/semihosting/semihosting.c		\
 				lib/semihosting/${ARCH}/semihosting_call.S \
-				plat/qemu/qemu_io_storage.c		\
-				plat/qemu/${ARCH}/plat_helpers.S	\
-				plat/qemu/qemu_bl1_setup.c
+				${PLAT_QEMU_COMMON_PATH}/qemu_io_storage.c		\
+				${PLAT_QEMU_COMMON_PATH}/${ARCH}/plat_helpers.S	\
+				${PLAT_QEMU_COMMON_PATH}/qemu_bl1_setup.c
 
 ifeq (${ARM_ARCH_MAJOR},8)
 BL1_SOURCES		+=	lib/cpus/aarch64/aem_generic.S		\
@@ -110,13 +114,13 @@ BL2_SOURCES		+=	drivers/io/io_semihosting.c		\
 				drivers/io/io_fip.c			\
 				drivers/io/io_memmap.c			\
 				lib/semihosting/semihosting.c		\
-				lib/semihosting/${ARCH}/semihosting_call.S\
-				plat/qemu/qemu_io_storage.c		\
-				plat/qemu/${ARCH}/plat_helpers.S	\
-				plat/qemu/qemu_bl2_setup.c		\
-				common/fdt_fixup.c			\
-				plat/qemu/qemu_bl2_mem_params_desc.c	\
-				plat/qemu/qemu_image_load.c		\
+				lib/semihosting/${ARCH}/semihosting_call.S		\
+				${PLAT_QEMU_COMMON_PATH}/qemu_io_storage.c		\
+				${PLAT_QEMU_COMMON_PATH}/${ARCH}/plat_helpers.S		\
+				${PLAT_QEMU_COMMON_PATH}/qemu_bl2_setup.c		\
+				${PLAT_QEMU_COMMON_PATH}/qemu_bl2_mem_params_desc.c	\
+				${PLAT_QEMU_COMMON_PATH}/qemu_image_load.c		\
+				common/fdt_fixup.c					\
 				common/desc_image_load.c
 
 ifeq ($(add-lib-optee),yes)
@@ -127,13 +131,13 @@ QEMU_GICV2_SOURCES	:=	drivers/arm/gic/v2/gicv2_helpers.c	\
 				drivers/arm/gic/v2/gicv2_main.c		\
 				drivers/arm/gic/common/gic_common.c	\
 				plat/common/plat_gicv2.c		\
-				plat/qemu/qemu_gicv2.c
+				${PLAT_QEMU_COMMON_PATH}/qemu_gicv2.c
 
 QEMU_GICV3_SOURCES	:=	drivers/arm/gic/v3/gicv3_helpers.c	\
 				drivers/arm/gic/v3/gicv3_main.c		\
 				drivers/arm/gic/common/gic_common.c	\
 				plat/common/plat_gicv3.c		\
-				plat/qemu/qemu_gicv3.c
+				${PLAT_QEMU_COMMON_PATH}/qemu_gicv3.c
 
 ifeq (${QEMU_USE_GIC_DRIVER}, QEMU_GICV2)
 QEMU_GIC_SOURCES	:=	${QEMU_GICV2_SOURCES}
@@ -148,10 +152,10 @@ BL31_SOURCES		+=	lib/cpus/aarch64/aem_generic.S		\
 				lib/cpus/aarch64/cortex_a53.S		\
 				lib/cpus/aarch64/cortex_a57.S		\
 				plat/common/plat_psci_common.c		\
-				plat/qemu/qemu_pm.c			\
-				plat/qemu/topology.c			\
-				plat/qemu/aarch64/plat_helpers.S	\
-				plat/qemu/qemu_bl31_setup.c		\
+				${PLAT_QEMU_COMMON_PATH}/qemu_pm.c			\
+				${PLAT_QEMU_COMMON_PATH}/topology.c			\
+				${PLAT_QEMU_COMMON_PATH}/aarch64/plat_helpers.S	\
+				${PLAT_QEMU_COMMON_PATH}/qemu_bl31_setup.c		\
 				${QEMU_GIC_SOURCES}
 endif
 
@@ -167,7 +171,7 @@ endif
 SEPARATE_CODE_AND_RODATA := 1
 ENABLE_STACK_PROTECTOR	 := 0
 ifneq ($(ENABLE_STACK_PROTECTOR), 0)
-	PLAT_BL_COMMON_SOURCES += plat/qemu/qemu_stack_protector.c
+	PLAT_BL_COMMON_SOURCES += ${PLAT_QEMU_COMMON_PATH}/qemu_stack_protector.c
 endif
 
 BL32_RAM_LOCATION	:=	tdram