WIP: ipc: expose coldrodata to IPC user thread

If SOF is built with CONFIG_SOF_USERSPACE_LL, the IPC user
handled will require access to coldrodata sections to initialize
audio modules.

This logic is not required for LLEXT modules, which have existing
code to add access to coldrodata (and other sections). This commit
is needed for builds where LLEXT is not used.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

src/ipc/ipc-common.c

@@ -645,6 +645,40 @@ __cold int ipc_user_init(void)
 
 	ret = k_mem_domain_add_partition(zephyr_ll_mem_domain(), &ipc_context_part);
 
+	/*
+	 * Grant user-space access to .cold (execute) and .coldrodata (read)
+	 * sections in IMR. The prepare path walks component code that may
+	 * reference __cold functions and __cold_rodata data.
+	 */
+#ifdef CONFIG_COLD_STORE_EXECUTE_DRAM
+	{
+		extern char __cold_start[], __cold_end[];
+		extern char __coldrodata_start[];
+		extern char _imr_end[];
+		struct k_mem_partition cold_part;
+
+		cold_part.start = (uintptr_t)__cold_start;
+		cold_part.size = ALIGN_UP((uintptr_t)__cold_end -
+					  (uintptr_t)__cold_start,
+					  CONFIG_MMU_PAGE_SIZE);
+		cold_part.attr = K_MEM_PARTITION_P_RX_U_RX;
+		ret = k_mem_domain_add_partition(zephyr_ll_mem_domain(),
+						 &cold_part);
+		if (ret < 0)
+			LOG_WRN("cold text partition add failed: %d", ret);
+
+		cold_part.start = (uintptr_t)__coldrodata_start;
+		cold_part.size = ALIGN_UP((uintptr_t)_imr_end -
+					  (uintptr_t)__coldrodata_start,
+					  CONFIG_MMU_PAGE_SIZE);
+		cold_part.attr = K_MEM_PARTITION_P_RO_U_RO;
+		ret = k_mem_domain_add_partition(zephyr_ll_mem_domain(),
+						 &cold_part);
+		if (ret < 0)
+			LOG_WRN("cold rodata partition add failed: %d", ret);
+	}
+#endif
+
 	k_sem_init(ipc_user->sem, 0, 1);
 
 	/* Allocate kernel objects for the user-space thread */