build: make cold data and code support universal

This extends LLEXT cold data and code support to the entire SOF code
base. Using the same __cold and __cold_rodata qualifies any code or
data can be marked to be used directly in DRAM without being copied
to SRAM.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

scripts/llext_link_helper.py

@@ -136,10 +136,10 @@ def main():
 	# run at arbitrary memory locations. One of the use-cases is running
 	# parts of the module directly in DRAM - sacrificing performance but
 	# saving scarce SRAM. We achieve this by placing non-performance
-	# critical functions in a .text.dram ELF section. When compiling and
-	# linking such functions, an additional .literal.dram section is
-	# automatically created. Note, that for some reason the compiler also
-	# marks that section as executable.
+	# critical functions in a .cold ELF section. When compiling and linking
+	# such functions, an additional .cold.literal section is automatically
+	# created. Note, that for some reason the compiler also marks that
+	# section as executable.
 	# This script links those sections at address 0. We could hard-code
 	# section names, but so far we choose to only link .text the "original"
 	# way and all other executable sections we link at 0.

src/include/module/module/llext.h

@@ -34,10 +34,4 @@ static const struct sof_module_api_build_info buildinfo __section(".mod_buildinf
 	.api_version_number.full = SOF_MODULE_API_CURRENT_VERSION, \
 }
 
-#if CONFIG_LLEXT_TYPE_ELF_RELOCATABLE && defined(LL_EXTENSION_BUILD)
-#define __cold __section(".text.dram")
-#else
-#define __cold
-#endif
-
 #endif

src/platform/ace30/include/platform/lib/memory.h

@@ -58,6 +58,12 @@
  */
 #define HEAPMEM_SIZE 0xD0000
 
+#if CONFIG_COLD_STORE_EXECUTE_DRAM && \
+	(CONFIG_LLEXT_TYPE_ELF_RELOCATABLE || !defined(LL_EXTENSION_BUILD))
+#define __cold __section(".cold")
+#define __cold_rodata __section(".coldrodata")
+#endif
+
 #endif /* __PLATFORM_LIB_MEMORY_H__ */
 
 #else

src/platform/lunarlake/include/platform/lib/memory.h

@@ -58,6 +58,12 @@
  */
 #define HEAPMEM_SIZE 0xF0000
 
+#if CONFIG_COLD_STORE_EXECUTE_DRAM && \
+	(CONFIG_LLEXT_TYPE_ELF_RELOCATABLE || !defined(LL_EXTENSION_BUILD))
+#define __cold __section(".cold")
+#define __cold_rodata __section(".coldrodata")
+#endif
+
 #endif /* __PLATFORM_LIB_MEMORY_H__ */
 
 #else

src/platform/meteorlake/include/platform/lib/memory.h

@@ -58,6 +58,12 @@
  */
 #define HEAPMEM_SIZE 0xF0000
 
+#if CONFIG_COLD_STORE_EXECUTE_DRAM && \
+	(CONFIG_LLEXT_TYPE_ELF_RELOCATABLE || !defined(LL_EXTENSION_BUILD))
+#define __cold __section(".cold")
+#define __cold_rodata __section(".coldrodata")
+#endif
+
 #endif /* __PLATFORM_LIB_MEMORY_H__ */
 
 #else

zephyr/include/sof/lib/memory.h

@@ -8,4 +8,12 @@
 
 #include <platform/lib/memory.h>
 
+#ifndef __cold
+#define __cold
+#endif
+
+#ifndef __cold_rodata
+#define __cold_rodata
+#endif
+
 #endif /* __SOF_LIB_MEMORY_H__ */