ipc: icmsg & icbmsg: Add support for POSIX arch targets

Add support in this IPC backends for POSIX arch targets in general,
and ensure the nrf5340bsim defines the buffer which will be used.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

include/zephyr/ipc/pbuf.h

@@ -35,6 +35,13 @@ extern "C" {
  */
 #define _PBUF_MIN_DATA_LEN ROUND_UP(PBUF_PACKET_LEN_SZ + 1 + _PBUF_IDX_SIZE, _PBUF_IDX_SIZE)
 
+#if defined(CONFIG_ARCH_POSIX)
+/* For the native simulated boards we need to modify some pointers at init */
+#define PBUF_MAYBE_CONST
+#else
+#define PBUF_MAYBE_CONST const
+#endif
+
 /** @brief Control block of packet buffer.
  *
  * The structure contains configuration data.
@@ -87,9 +94,9 @@ struct pbuf_data {
  * written in a way to protect the data from being corrupted.
  */
 struct pbuf {
-	const struct pbuf_cfg *const cfg;	/* Configuration of the
+	PBUF_MAYBE_CONST struct pbuf_cfg *const cfg; /* Configuration of the
-						 * buffer.
+						      * buffer.
-						 */
+						      */
 	struct pbuf_data data;			/* Data used to read and write
 						 * to the buffer
 						 */
@@ -144,8 +151,7 @@ struct pbuf {
 			"Misaligned memory.");						\
 	BUILD_ASSERT(size >= (MAX(dcache_align, _PBUF_IDX_SIZE) + _PBUF_IDX_SIZE +	\
 			_PBUF_MIN_DATA_LEN), "Insufficient size.");			\
-											\
+	static PBUF_MAYBE_CONST struct pbuf_cfg cfg_##name =				\
-	static const struct pbuf_cfg cfg_##name =					\
 			PBUF_CFG_INIT(mem_addr, size, dcache_align);			\
 	static struct pbuf name = {							\
 		.cfg = &cfg_##name,							\

subsys/ipc/ipc_service/backends/ipc_icbmsg.c

@@ -87,6 +87,13 @@
 #include <zephyr/ipc/ipc_service_backend.h>
 #include <zephyr/cache.h>
 
+#if defined(CONFIG_ARCH_POSIX)
+#include <soc.h>
+#define MAYBE_CONST
+#else
+#define MAYBE_CONST const
+#endif
+
 LOG_MODULE_REGISTER(ipc_icbmsg,
 		    CONFIG_IPC_SERVICE_BACKEND_ICBMSG_LOG_LEVEL);
 
@@ -1178,12 +1185,17 @@ static int release_rx_buffer(const struct device *instance, void *token, void *d
  */
 static int backend_init(const struct device *instance)
 {
-	const struct icbmsg_config *conf = instance->config;
+	MAYBE_CONST struct icbmsg_config *conf = (struct icbmsg_config *)instance->config;
 	struct backend_data *dev_data = instance->data;
 #ifdef CONFIG_MULTITHREADING
 	static K_THREAD_STACK_DEFINE(ep_bound_work_q_stack, EP_BOUND_WORK_Q_STACK_SIZE);
 	static bool is_work_q_started;
 
+#if defined(CONFIG_ARCH_POSIX)
+	native_emb_addr_remap((void **)&conf->tx.blocks_ptr);
+	native_emb_addr_remap((void **)&conf->rx.blocks_ptr);
+#endif
+
 	if (!is_work_q_started) {
 		k_work_queue_init(&ep_bound_work_q);
 		k_work_queue_start(&ep_bound_work_q, ep_bound_work_q_stack,
@@ -1341,7 +1353,7 @@ const static struct ipc_service_backend backend_ops = {
 			.rx_pb = &rx_icbmsg_pb_##i,					\
 		}									\
 	};										\
-	static const struct icbmsg_config backend_config_##i =				\
+	static MAYBE_CONST struct icbmsg_config backend_config_##i =			\
 	{										\
 		.control_config = {							\
 			.mbox_tx = MBOX_DT_SPEC_INST_GET(i, tx),			\

subsys/ipc/ipc_service/lib/pbuf.c

@@ -11,6 +11,10 @@
 #include <zephyr/ipc/pbuf.h>
 #include <zephyr/sys/byteorder.h>
 
+#if defined(CONFIG_ARCH_POSIX)
+#include <soc.h>
+#endif
+
 /* Helper funciton for getting numer of bytes being written to the bufer. */
 static uint32_t idx_occupied(uint32_t len, uint32_t wr_idx, uint32_t rd_idx)
 {
@@ -54,11 +58,23 @@ static int validate_cfg(const struct pbuf_cfg *cfg)
 	return 0;
 }
 
+#if defined(CONFIG_ARCH_POSIX)
+void pbuf_native_addr_remap(struct pbuf *pb)
+{
+	native_emb_addr_remap((void **)&pb->cfg->rd_idx_loc);
+	native_emb_addr_remap((void **)&pb->cfg->wr_idx_loc);
+	native_emb_addr_remap((void **)&pb->cfg->data_loc);
+}
+#endif
+
 int pbuf_tx_init(struct pbuf *pb)
 {
 	if (validate_cfg(pb->cfg) != 0) {
 		return -EINVAL;
 	}
+#if defined(CONFIG_ARCH_POSIX)
+	pbuf_native_addr_remap(pb);
+#endif
 
 	/* Initialize local copy of indexes. */
 	pb->data.wr_idx = 0;
@@ -82,6 +98,10 @@ int pbuf_rx_init(struct pbuf *pb)
 	if (validate_cfg(pb->cfg) != 0) {
 		return -EINVAL;
 	}
+#if defined(CONFIG_ARCH_POSIX)
+	pbuf_native_addr_remap(pb);
+#endif
+
 	/* Initialize local copy of indexes. */
 	pb->data.wr_idx = 0;
 	pb->data.rd_idx = 0;

tests/subsys/ipc/pbuf/src/main.c

@@ -48,7 +48,7 @@ ZTEST(test_pbuf, test_rw)
 	 * order to avoid clang complains about memory_area not being constant
 	 * expression.
 	 */
-	static const struct pbuf_cfg cfg = PBUF_CFG_INIT(memory_area, MEM_AREA_SZ, 0);
+	static PBUF_MAYBE_CONST struct pbuf_cfg cfg = PBUF_CFG_INIT(memory_area, MEM_AREA_SZ, 0);
 
 	static struct pbuf pb = {
 		.cfg = &cfg,
@@ -115,9 +115,9 @@ ZTEST(test_pbuf, test_retcodes)
 	 * order to avoid clang complains about memory_area not being constant
 	 * expression.
 	 */
-	static const struct pbuf_cfg cfg0 = PBUF_CFG_INIT(memory_area, MEM_AREA_SZ, 32);
+	static PBUF_MAYBE_CONST struct pbuf_cfg cfg0 = PBUF_CFG_INIT(memory_area, MEM_AREA_SZ, 32);
-	static const struct pbuf_cfg cfg1 = PBUF_CFG_INIT(memory_area, MEM_AREA_SZ, 0);
+	static PBUF_MAYBE_CONST struct pbuf_cfg cfg1 = PBUF_CFG_INIT(memory_area, MEM_AREA_SZ, 0);
-	static const struct pbuf_cfg cfg2 = PBUF_CFG_INIT(memory_area, 20, 4);
+	static PBUF_MAYBE_CONST struct pbuf_cfg cfg2 = PBUF_CFG_INIT(memory_area, 20, 4);
 
 	static struct pbuf pb0 = {
 		.cfg = &cfg0,
@@ -268,7 +268,7 @@ ZTEST(test_pbuf, test_stress)
 	 * order to avoid clang complains about buffer not being constant
 	 * expression.
 	 */
-	static const struct pbuf_cfg cfg = PBUF_CFG_INIT(buffer, MEM_AREA_SZ, 4);
+	static PBUF_MAYBE_CONST struct pbuf_cfg cfg = PBUF_CFG_INIT(buffer, MEM_AREA_SZ, 4);
 
 	static struct pbuf pb = {
 		.cfg = &cfg,