Apply compile-time check for AArch64-only cores

Some cores support only AArch64 mode. In those cores, only a limited
subset of the AArch32 system registers are implemented. Hence, if TF-A
is supposed to run on AArch64-only cores, it must be compiled with
CTX_INCLUDE_AARCH32_REGS=0.

Currently, the default settings for compiling TF-A are with the AArch32
system registers included. So, if we compile TF-A the default way and
attempt to run it on an AArch64-only core, we only get a runtime panic.

Now a compile-time check has been added to ensure that this flag has the
appropriate value when AArch64-only cores are included in the build.

Change-Id: I298ec550037fafc9347baafb056926d149197d4c
Signed-off-by: John Tsichritzis <john.tsichritzis@arm.com>

lib/cpus/aarch64/cortex_a76.S

@@ -18,6 +18,11 @@
 #error "Cortex-A76 must be compiled with HW_ASSISTED_COHERENCY enabled"
 #endif
 
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Cortex-A76 supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
+#endif
+
 #define ESR_EL3_A64_SMC0	0x5e000000
 #define ESR_EL3_A32_SMC0	0x4e000000
 

lib/cpus/aarch64/cortex_a76ae.S

@@ -11,6 +11,11 @@
 /* Hardware handled coherency */
 #if HW_ASSISTED_COHERENCY == 0
 #error "Cortex-A76AE must be compiled with HW_ASSISTED_COHERENCY enabled"
+#endif
+
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Cortex-A76AE supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
 #endif
 
 	/* ---------------------------------------------

lib/cpus/aarch64/cortex_deimos.S

@@ -14,6 +14,11 @@
 /* Hardware handled coherency */
 #if HW_ASSISTED_COHERENCY == 0
 #error "Deimos must be compiled with HW_ASSISTED_COHERENCY enabled"
+#endif
+
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Cortex-Deimos supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
 #endif
 
 	/* ---------------------------------------------

lib/cpus/aarch64/neoverse_e1.S

@@ -16,6 +16,11 @@
 #error "Neoverse E1 must be compiled with HW_ASSISTED_COHERENCY enabled"
 #endif
 
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Neoverse-E1 supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
+#endif
+
 func neoverse_e1_cpu_pwr_dwn
 	mrs	x0, NEOVERSE_E1_CPUPWRCTLR_EL1
 	orr	x0, x0, #NEOVERSE_E1_CPUPWRCTLR_EL1_CORE_PWRDN_BIT

lib/cpus/aarch64/neoverse_n1.S

@@ -15,6 +15,11 @@
 #error "Neoverse N1 must be compiled with HW_ASSISTED_COHERENCY enabled"
 #endif
 
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Neoverse-N1 supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
+#endif
+
 /* --------------------------------------------------
  * Errata Workaround for Neoverse N1 Errata
  * This applies to revision r0p0 and r1p0 of Neoverse N1.

lib/cpus/aarch64/neoverse_zeus.S

@@ -14,6 +14,11 @@
 /* Hardware handled coherency */
 #if HW_ASSISTED_COHERENCY == 0
 #error "Neoverse Zeus must be compiled with HW_ASSISTED_COHERENCY enabled"
+#endif
+
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Neoverse-Zeus supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
 #endif
 
 	/* ---------------------------------------------

plat/arm/board/fvp/platform.mk

@@ -96,8 +96,8 @@ FVP_CPU_LIBS		:=	lib/cpus/${ARCH}/aem_generic.S
 
 ifeq (${ARCH}, aarch64)
 
-# select a different set of CPU files, depending on whether we compile with
-# hardware assisted coherency configurations or not
+# select a different set of CPU files, depending on whether we compile for
+# hardware assisted coherency cores or not
 ifeq (${HW_ASSISTED_COHERENCY}, 0)
 	FVP_CPU_LIBS	+=	lib/cpus/aarch64/cortex_a35.S			\
 				lib/cpus/aarch64/cortex_a53.S			\
@@ -105,14 +105,19 @@ ifeq (${HW_ASSISTED_COHERENCY}, 0)
 				lib/cpus/aarch64/cortex_a72.S			\
 				lib/cpus/aarch64/cortex_a73.S
 else
-	FVP_CPU_LIBS	+=	lib/cpus/aarch64/cortex_a55.S			\
-				lib/cpus/aarch64/cortex_a75.S			\
-				lib/cpus/aarch64/cortex_a76.S			\
-				lib/cpus/aarch64/cortex_a76ae.S			\
-				lib/cpus/aarch64/neoverse_n1.S			\
-				lib/cpus/aarch64/neoverse_e1.S			\
-				lib/cpus/aarch64/cortex_deimos.S		\
-				lib/cpus/aarch64/neoverse_zeus.S
+	# AArch64-only cores
+	ifeq (${CTX_INCLUDE_AARCH32_REGS}, 0)
+		FVP_CPU_LIBS	+=	lib/cpus/aarch64/cortex_a76.S		\
+					lib/cpus/aarch64/cortex_a76ae.S		\
+					lib/cpus/aarch64/neoverse_n1.S		\
+					lib/cpus/aarch64/neoverse_e1.S		\
+					lib/cpus/aarch64/cortex_deimos.S	\
+					lib/cpus/aarch64/neoverse_zeus.S
+	# AArch64/AArch32
+	else
+		FVP_CPU_LIBS	+=	lib/cpus/aarch64/cortex_a55.S		\
+					lib/cpus/aarch64/cortex_a75.S
+	endif
 endif
 
 else