arm64: Add new CPU_CORTEX_A78 configuration for Cortex-A78 support

Introduce a new Kconfig option CPU_CORTEX_A78 to enable support for the
Arm Cortex-A78 CPU architecture within Zephyr. This configuration can be
selected by boards or SoCs that utilize the Cortex-A78 core, enabling
architecture-specific features and optimizations as needed.

Signed-off-by: Appana Durga Kedareswara rao <appana.durga.kedareswara.rao@amd.com>

Author: Appana Durga Kedareswara rao

arch/arm64/core/Kconfig

@@ -72,6 +72,13 @@ config CPU_CORTEX_A76_A55
 	help
 	  This option signifies the use of a Cortex-A76 and A55 big little CPU cluster
 
+config CPU_CORTEX_A78
+	bool
+	select CPU_CORTEX_A
+	select ARMV8_A
+	help
+	  This option signifies the use of a Cortex-A78 CPU
+
 config CPU_CORTEX_R82
 	bool
 	select CPU_AARCH64_CORTEX_R

cmake/gcc-m-cpu.cmake

@@ -103,6 +103,8 @@ elseif("${ARCH}" STREQUAL "arm64")
     set(GCC_M_TUNE cortex-a76.cortex-a55)
   elseif(CONFIG_CPU_CORTEX_A72)
     set(GCC_M_CPU cortex-a72)
+  elseif(CONFIG_CPU_CORTEX_A78)
+    set(GCC_M_CPU cortex-a78)
   elseif(CONFIG_CPU_CORTEX_R82)
     set(GCC_M_CPU cortex-r82)
   endif()

subsys/mgmt/mcumgr/grp/os_mgmt/include/os_mgmt_processor.h

@@ -121,6 +121,8 @@ extern "C" {
 #define PROCESSOR_NAME "cortex-a76"
 #elif defined(CONFIG_CPU_CORTEX_A76)
 #define PROCESSOR_NAME "cortex-a76"
+#elif defined(CONFIG_CPU_CORTEX_A78)
+#define PROCESSOR_NAME "cortex-a78"
 #elif defined(CONFIG_CPU_CORTEX_R82)
 #define PROCESSOR_NAME "armv8.4-a+nolse"
 #endif