add raspberry pi 64 bit build files

b.sh

@@ -22,6 +22,9 @@ do
 		--rpi)
 			CMAKE_ARGS="-DCMAKE_TOOLCHAIN_FILE=cmake/Toolchains/raspberry.armv7.cmake ${CMAKE_ARGS}"
 			;;
+                --rpi64)
+                        CMAKE_ARGS="-DCMAKE_TOOLCHAIN_FILE=cmake/Toolchains/raspberry.armv8.cmake ${CMAKE_ARGS}"
+                        ;;
 		--android) CMAKE_ARGS="-DCMAKE_TOOLCHAIN_FILE=android/android.toolchain.cmake ${CMAKE_ARGS}"
 			TARGET_OS=Android
 			PACKAGE=1

cmake/Toolchains/raspberry.armv8.cmake

@@ -0,0 +1,42 @@
+file(READ "/sys/firmware/devicetree/base/compatible" PPSSPP_PI_MODEL)
+
+if(PPSSPP_PI_MODEL MATCHES "raspberrypi,4")
+  set(PPSSPP_PI_MODEL4 ON)
+endif()
+
+if(NOT PPSSPP_PI_MODEL4 AND NOT EXISTS "/opt/vc/include/bcm_host.h")
+  message(FATAL_ERROR "RaspberryPI platform not recognized")
+endif()
+
+include_directories(SYSTEM
+  /opt/vc/include
+  /opt/vc/include/interface/vcos/pthreads
+  /opt/vc/include/interface/vmcx_host/linux
+)
+
+if(NOT PPSSPP_PI_MODEL4)
+  add_definitions(
+    -DPPSSPP_PLATFORM_RPI=1
+    -U__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
+  )
+endif()
+
+if(PPSSPP_PI_MODEL4)
+  set(ARCH_FLAGS "-march=armv8-a+crc -mtune=cortex-a72 -funsafe-math-optimizations")
+else()
+  set(ARCH_FLAGS "-mcpu=cortex-a7 -mfpu=neon -mfloat-abi=hard")
+endif()
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${ARCH_FLAGS}"  CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ARCH_FLAGS}" CACHE STRING "" FORCE)
+set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${ARCH_FLAGS}" CACHE STRING "" FORCE)
+
+set(CMAKE_EXE_LINKER_FLAGS "-L/opt/vc/lib" CACHE STRING "" FORCE)
+
+if(NOT PPSSPP_PI_MODEL4)
+  set(OPENGL_LIBRARIES brcmGLESv2 bcm_host)
+  set(EGL_LIBRARIES brcmEGL)
+  set(USING_FBDEV ON)
+endif()
+set(USING_GLES2 ON)
+set(ARMV7 ON)
+set(USE_WAYLAND_WSI OFF)