[arch][arm] Add armv8-a

Allow arm8 systems to set ARM_CPU to armv8-a to use new armv8 instructions
in 32 bit code.

Change-Id: Idad8d5fd81c71bab2f306923df7d342bac742c28

arch/arm/include/arch/arm/cores.h

@@ -34,6 +34,12 @@
 
 /* echo | gcc -E -dM - to dump builtin defines */
 
+#if defined(__ARM_ARCH_8A__)
+#ifndef ARM_ARCH_LEVEL
+#define ARM_ARCH_LEVEL 8
+#endif
+#endif
+
 #if defined(__ARM_ARCH_7EM__)
 #define ARM_ARCH_7EM 1
 #endif

arch/arm/include/arch/defines.h

@@ -48,6 +48,8 @@
 #define CACHE_LINE 32
 #elif ARM_CPU_CORTEX_A15
 #define CACHE_LINE 64
+#elif ARM_CPU_CORTEX_ARMV8_A
+#define CACHE_LINE 64
 #else
 #error unknown cpu
 #endif

arch/arm/rules.mk

@@ -193,6 +193,24 @@ GLOBAL_DEFINES += \
 HANDLED_CORE := true
 ENABLE_THUMB := false # armemu doesn't currently support thumb properly
 endif
+ifeq ($(ARM_CPU),armv8-a)
+GLOBAL_DEFINES += \
+	ARM_CPU_CORTEX_ARMV8_A=1 \
+	ARM_WITH_CP15=1 \
+	ARM_WITH_MMU=1 \
+	ARM_ISA_ARMv7=1 \
+	ARM_ISA_ARMv7A=1 \
+	ARM_WITH_THUMB=1 \
+	ARM_WITH_THUMB2=1 \
+	ARM_WITH_CACHE=1 \
+	ARM_WITH_L2=1
+ifneq ($(ARM_WITHOUT_VFP_NEON),true)
+GLOBAL_DEFINES += \
+	ARM_WITH_VFP=1 \
+	ARM_WITH_NEON=1
+endif
+HANDLED_CORE := true
+endif
 
 ifneq ($(HANDLED_CORE),true)
 $(error $(LOCAL_DIR)/rules.mk doesnt have logic for arm core $(ARM_CPU))

arch/arm/toolchain.mk

@@ -108,5 +108,11 @@ endif
 ifeq ($(ARM_CPU),armemu)
 ARCH_arm_COMPILEFLAGS += -march=armv7-a
 endif
+ifeq ($(ARM_CPU),armv8-a)
+ARCH_arm_COMPILEFLAGS += -march=$(ARM_CPU)
+ifneq ($(ARM_WITHOUT_VFP_NEON),true)
+ARCH_arm_COMPILEFLAGS += -mfpu=vfpv3 -mfloat-abi=softfp
+endif
+endif
 
 endif