ipc: backends: rpmsg: initialize shared memory to zero (33408fa7) · Commits · Wenxi XU / zephyr

subsys/ipc/ipc_service/backends/Kconfig.rpmsg

+9 −0

Original line number	Diff line number	Diff line
		@@ -12,4 +12,13 @@ config IPC_SERVICE_BACKEND_RPMSG_WQ_STACK_SIZE
		prevent notifying service users about received data from the system
		work queue. Size is the same for all instances.

		config IPC_SERVICE_BACKEND_RPMSG_SHMEM_RESET
		bool "Reset shared memory state"
		help
		Some platforms retain the memory content upon reset. This is
		problematic because the backend expects a zero-ed memory to be
		able to correctly setup instances and endpoints at init time.
		When this parameter is set to 'y' the status region of the shared
		memory is reset on kernel initialization.

		endif # IP_SERVICE_BACKEND_RPMSG

+21 −0

Original line number	Diff line number	Diff line
		@@ -508,3 +508,24 @@ static int backend_init(const struct device *instance)
		&backend_ops);

		DT_INST_FOREACH_STATUS_OKAY(DEFINE_BACKEND_DEVICE)

		#define BACKEND_CONFIG_INIT(n) &backend_config_##n,

		#if defined(CONFIG_IPC_SERVICE_BACKEND_RPMSG_SHMEM_RESET)
		static int shared_memory_prepare(const struct device *arg)
		{
		static const struct backend_config_t *config[] = {
		DT_INST_FOREACH_STATUS_OKAY(BACKEND_CONFIG_INIT)
		};

		for (int i = 0; i < DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT); i++) {
		if (config[i]->role == ROLE_HOST) {
		memset((void *) config[i]->shm_addr, 0, VDEV_STATUS_SIZE);
		}
		}

		return 0;
		}

		SYS_INIT(shared_memory_prepare, PRE_KERNEL_1, 1);
		#endif /* CONFIG_IPC_SERVICE_BACKEND_RPMSG_SHMEM_RESET */