cache: Fix cache API calling from userspace

When a cache API function is called from userspace, this results on
ARM64 in an OOPS (bad syscall error). This is due to at least two
different factors:

- the location of the cache handlers is preventing the linker to
  actually find the handlers
- specifically for ARM64 and ARC some cache handling functions are not
  implemented (when userspace is not used the compiler simply optimizes
  out these calls)

Fix the problem by:

- moving the userspace cache handlers to a their logical and proper
  location (in the drivers directory)
- adding the missing handlers for ARM64 and ARC

Signed-off-by: Carlo Caione <ccaione@baylibre.com>

arch/arc/core/cache.c

@@ -139,6 +139,21 @@ int arch_dcache_range(void *addr, size_t size, int op)
 	return 0;
 }
 
+int arch_icache_range(void *addr, size_t size, int op)
+{
+	return -ENOTSUP;
+}
+
+int arch_dcache_all(int op)
+{
+	return -ENOTSUP;
+}
+
+int arch_icache_all(int op)
+{
+	return -ENOTSUP;
+}
+
 #if defined(CONFIG_DCACHE_LINE_SIZE_DETECT)
 static void init_dcache_line_size(void)
 {

arch/arm64/core/cache.c

@@ -206,3 +206,13 @@ int arch_dcache_all(int op)
 
 	return 0;
 }
+
+int arch_icache_range(void *addr, size_t size, int op)
+{
+	return -ENOTSUP;
+}
+
+int arch_icache_all(int op)
+{
+	return -ENOTSUP;
+}

drivers/cache/CMakeLists.txt

@@ -1,2 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
-zephyr_sources_ifdef(CONFIG_CACHE_ASPEED cache_aspeed.c)
+
+zephyr_library()
+
+zephyr_library_sources_ifdef(CONFIG_CACHE_ASPEED	cache_aspeed.c)
+zephyr_library_sources_ifdef(CONFIG_USERSPACE		cache_handlers.c)

kernel/CMakeLists.txt

@@ -101,10 +101,6 @@ target_sources_ifdef(
   userspace.c
   )
 
-if(CONFIG_CACHE_MANAGEMENT AND CONFIG_USERSPACE)
-  target_sources(kernel PRIVATE cache_handlers.c)
-endif()
-
 target_include_directories(kernel PRIVATE
   ${ZEPHYR_BASE}/kernel/include
   ${ARCH_DIR}/${ARCH}/include