feat(core): implement micropython ipc wrapper

diff --git a/core/embed/upymod/modtrezorio/modtrezorio-fatfs.h b/core/embed/upymod/modtrezorio/modtrezorio-fatfs.h
index 4d9c16823..3efa1b33f 100644
--- a/core/embed/upymod/modtrezorio/modtrezorio-fatfs.h
+++ b/core/embed/upymod/modtrezorio/modtrezorio-fatfs.h
@@ -17,7 +17,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "embed/upymod/trezorobj.h"
 #include "py/mperrno.h"
 #include "py/objstr.h"
 
diff --git a/core/embed/upymod/modtrezorio/modtrezorio-ipc.h b/core/embed/upymod/modtrezorio/modtrezorio-ipc.h
new file mode 100644
index 000000000..caacb69e9
--- /dev/null
+++ b/core/embed/upymod/modtrezorio/modtrezorio-ipc.h
@@ -0,0 +1,119 @@
+/*
+ * This file is part of the Trezor project, https://trezor.io/
+ *
+ * Copyright (c) SatoshiLabs
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <trezor_rtl.h>
+
+#include <sys/ipc.h>
+
+/// package: trezorio.__init__
+
+/// def ipc_send(remote: int, fn: int, data: AnyBytes) -> None:
+///     """
+///     Sends an IPC message to the specified remote task.
+///     """
+STATIC mp_obj_t mod_trezorio_ipc_send(mp_obj_t remote_obj, mp_obj_t fn_obj,
+                                      mp_obj_t data_obj) {
+  mp_buffer_info_t bufinfo = {0};
+  mp_get_buffer_raise(data_obj, &bufinfo, MP_BUFFER_READ);
+
+  systask_id_t remote = (systask_id_t)mp_obj_get_int(remote_obj);
+  uint32_t fn = (uint32_t)mp_obj_get_int(fn_obj);
+
+  if (!ipc_send(remote, fn, bufinfo.buf, bufinfo.len)) {
+    mp_raise_msg(&mp_type_RuntimeError,
+                 MP_ERROR_TEXT("Failed to send IPC message."));
+  }
+  return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_trezorio_ipc_send_obj,
+                                 mod_trezorio_ipc_send);
+
+/// class IpcMessage:
+///     """
+///     IPC message structure.
+///     """
+typedef struct _mp_obj_IpcMessage_t {
+  mp_obj_base_t base;
+  ipc_message_t message;
+} mp_obj_IpcMessage_t;
+
+/// def fn(self) -> int:
+///     """
+///     Returns the function number.
+///     """
+STATIC mp_obj_t mod_trezorio_IpcMessage_fn(mp_obj_t self) {
+  mp_obj_IpcMessage_t *o = MP_OBJ_TO_PTR(self);
+  return MP_OBJ_NEW_SMALL_INT(o->message.fn);  // !@# uint
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorio_IpcMessage_fn_obj,
+                                 mod_trezorio_IpcMessage_fn);
+
+/// def remote(self) -> int:
+///     """
+///     Returns the remote task ID.
+///     """
+STATIC mp_obj_t mod_trezorio_IpcMessage_remote(mp_obj_t self) {
+  mp_obj_IpcMessage_t *o = MP_OBJ_TO_PTR(self);
+  return MP_OBJ_NEW_SMALL_INT(o->message.remote);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorio_IpcMessage_remote_obj,
+                                 mod_trezorio_IpcMessage_remote);
+
+/// def free(self) -> None:
+///     """
+///     Frees the IPC message resources.
+///     """
+STATIC mp_obj_t mod_trezorio_IpcMessage_free(mp_obj_t self) {
+  mp_obj_IpcMessage_t *o = MP_OBJ_TO_PTR(self);
+
+  ipc_message_free(&o->message);
+  memset(&o->message, 0, sizeof(ipc_message_t));
+
+  return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorio_IpcMessage_free_obj,
+                                 mod_trezorio_IpcMessage_free);
+
+/// def data(self) -> bytes:
+///     """
+///     Returns the IPC message data as bytes.
+///     """
+STATIC mp_obj_t mod_trezorio_IpcMessage_data(mp_obj_t self) {
+  mp_obj_IpcMessage_t *o = MP_OBJ_TO_PTR(self);
+  return mp_obj_new_bytes(o->message.data, o->message.size);
+}
+
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorio_IpcMessage_data_obj,
+                                 mod_trezorio_IpcMessage_data);
+
+STATIC const mp_rom_map_elem_t mod_trezorio_IpcMessage_locals_dict_table[] = {
+    {MP_ROM_QSTR(MP_QSTR_remote),
+     MP_ROM_PTR(&mod_trezorio_IpcMessage_remote_obj)},
+    {MP_ROM_QSTR(MP_QSTR_fn), MP_ROM_PTR(&mod_trezorio_IpcMessage_fn_obj)},
+    {MP_ROM_QSTR(MP_QSTR_data), MP_ROM_PTR(&mod_trezorio_IpcMessage_data_obj)},
+    {MP_ROM_QSTR(MP_QSTR_free), MP_ROM_PTR(&mod_trezorio_IpcMessage_free_obj)},
+};
+STATIC MP_DEFINE_CONST_DICT(mod_trezorio_IpcMessage_locals_dict,
+                            mod_trezorio_IpcMessage_locals_dict_table);
+
+STATIC const mp_obj_type_t mod_trezorio_IpcMessage_type = {
+    {&mp_type_type},
+    .name = MP_QSTR_IpcMessage,
+    .locals_dict = (void *)&mod_trezorio_IpcMessage_locals_dict,
+};
diff --git a/core/embed/upymod/modtrezorio/modtrezorio-poll.h b/core/embed/upymod/modtrezorio/modtrezorio-poll.h
index 3d192baed..f5f0e41b5 100644
--- a/core/embed/upymod/modtrezorio/modtrezorio-poll.h
+++ b/core/embed/upymod/modtrezorio/modtrezorio-poll.h
@@ -36,7 +36,9 @@
 #include <io/power_manager.h>
 #endif
 
-#include "embed/upymod/trezorobj.h"
+#ifdef USE_IPC
+#include <sys/ipc.h>
+#endif
 
 #define POLL_READ (0x0000)
 #define POLL_WRITE (0x0100)
@@ -129,6 +131,20 @@ STATIC mp_obj_t mod_trezorio_poll(mp_obj_t ifaces, mp_obj_t list_ref,
       return mp_const_false;
     }
 
+#ifdef USE_IPC
+    if (signalled.read_ready & (1 << SYSHANDLE_IPC2)) {
+      ipc_message_t message = {.remote = 2};
+      if (ipc_try_receive(&message)) {
+        mp_obj_IpcMessage_t *o =
+            mp_obj_malloc(mp_obj_IpcMessage_t, &mod_trezorio_IpcMessage_type);
+        o->message = message;
+        ret->items[0] = MP_OBJ_NEW_SMALL_INT(SYSHANDLE_IPC2);
+        ret->items[1] = MP_OBJ_FROM_PTR(o);
+        return mp_const_true;
+      }
+    }
+#endif
+
 #ifdef USE_TOUCH
     if (signalled.read_ready & (1 << SYSHANDLE_TOUCH)) {
       const uint32_t evt = touch_get_event();
diff --git a/core/embed/upymod/modtrezorio/modtrezorio-sdcard.h b/core/embed/upymod/modtrezorio/modtrezorio-sdcard.h
index cf0890006..3f10ff125 100644
--- a/core/embed/upymod/modtrezorio/modtrezorio-sdcard.h
+++ b/core/embed/upymod/modtrezorio/modtrezorio-sdcard.h
@@ -17,7 +17,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "embed/upymod/trezorobj.h"
 #include "py/mperrno.h"
 
 #include <io/sdcard.h>
diff --git a/core/embed/upymod/modtrezorio/modtrezorio-usb-if.h b/core/embed/upymod/modtrezorio/modtrezorio-usb-if.h
index da3ef0a1c..0c8ce11e6 100644
--- a/core/embed/upymod/modtrezorio/modtrezorio-usb-if.h
+++ b/core/embed/upymod/modtrezorio/modtrezorio-usb-if.h
@@ -17,6 +17,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <sys/sysevent.h>
+
 /// package: trezorio.__init__
 
 /// class USBIF:
diff --git a/core/embed/upymod/modtrezorio/modtrezorio.c b/core/embed/upymod/modtrezorio/modtrezorio.c
index 08533ed54..3260c2cf3 100644
--- a/core/embed/upymod/modtrezorio/modtrezorio.c
+++ b/core/embed/upymod/modtrezorio/modtrezorio.c
@@ -45,8 +45,9 @@ uint32_t last_touch_sample_time = 0;
     mp_raise_ValueError((mp_rom_error_text_t)msg); \
   }
 
+#include "embed/upymod/trezorobj.h"
+
 // clang-format off
-#include "modtrezorio-poll.h"
 #include "modtrezorio-usb.h"
 #include "modtrezorio-usb-if.h"
 // clang-format on
@@ -63,9 +64,13 @@ uint32_t last_touch_sample_time = 0;
 #ifdef USE_POWER_MANAGER
 #include "modtrezorio-pm.h"
 #endif
+#ifdef USE_IPC
+#include "modtrezorio-ipc.h"
+#endif
+#include "modtrezorio-poll.h"
 
 /// package: trezorio.__init__
-/// from . import fatfs, haptic, sdcard, ble, pm, rgb_led
+/// from . import fatfs, haptic, sdcard, ble, pm, rgb_led, ipc
 
 /// POLL_READ: int  # wait until interface is readable and return read data
 /// POLL_WRITE: int  # wait until interface is writable
@@ -75,6 +80,8 @@ uint32_t last_touch_sample_time = 0;
 ///
 /// PM_EVENT: int  # interface id for power manager events
 ///
+/// IPC2_EVENT: int  # interface id for IPC2 events
+///
 /// TOUCH: int  # interface id of the touch events
 /// TOUCH_START: int  # event id of touch start event
 /// TOUCH_MOVE: int  # event id of touch move event
@@ -129,6 +136,10 @@ STATIC const mp_rom_map_elem_t mp_module_trezorio_globals_table[] = {
     {MP_ROM_QSTR(MP_QSTR_pm), MP_ROM_PTR(&mod_trezorio_pm_module)},
     {MP_ROM_QSTR(MP_QSTR_PM_EVENT), MP_ROM_INT(SYSHANDLE_POWER_MANAGER)},
 #endif
+#ifdef USE_IPC
+    {MP_ROM_QSTR(MP_QSTR_IPC2_EVENT), MP_ROM_INT(SYSHANDLE_IPC2)},
+    {MP_ROM_QSTR(MP_QSTR_ipc_send), MP_ROM_PTR(&mod_trezorio_ipc_send_obj)},
+#endif
 
     {MP_ROM_QSTR(MP_QSTR_USB), MP_ROM_PTR(&mod_trezorio_USB_type)},
     {MP_ROM_QSTR(MP_QSTR_USBIF), MP_ROM_PTR(&mod_trezorio_USBIF_type)},
diff --git a/core/mocks/generated/trezorio/__init__.pyi b/core/mocks/generated/trezorio/__init__.pyi
index 06ca78047..1e87541ea 100644
--- a/core/mocks/generated/trezorio/__init__.pyi
+++ b/core/mocks/generated/trezorio/__init__.pyi
@@ -2,6 +2,40 @@ from typing import *
 from buffer_types import *
 
 
+# upymod/modtrezorio/modtrezorio-ipc.h
+def ipc_send(remote: int, fn: int, data: AnyBytes) -> None:
+    """
+    Sends an IPC message to the specified remote task.
+    """
+
+
+# upymod/modtrezorio/modtrezorio-ipc.h
+class IpcMessage:
+    """
+    IPC message structure.
+    """
+
+    def fn(self) -> int:
+        """
+        Returns the function number.
+        """
+
+    def remote(self) -> int:
+        """
+        Returns the remote task ID.
+        """
+
+    def free(self) -> None:
+        """
+        Frees the IPC message resources.
+        """
+
+    def data(self) -> bytes:
+        """
+        Returns the IPC message data as bytes.
+        """
+
+
 # upymod/modtrezorio/modtrezorio-poll.h
 def poll(ifaces: Iterable[int], list_ref: list, timeout_ms: int) -> bool:
     """
@@ -79,7 +113,7 @@ class USB:
         """
         Cleans up the USB stack.
         """
-from . import fatfs, haptic, sdcard, ble, pm, rgb_led
+from . import fatfs, haptic, sdcard, ble, pm, rgb_led, ipc
 POLL_READ: int  # wait until interface is readable and return read data
 POLL_WRITE: int  # wait until interface is writable
 
@@ -88,6 +122,8 @@ BLE_EVENT: int # interface id for BLE events
 
 PM_EVENT: int  # interface id for power manager events
 
+IPC2_EVENT: int  # interface id for IPC2 events
+
 TOUCH: int  # interface id of the touch events
 TOUCH_START: int  # event id of touch start event
 TOUCH_MOVE: int  # event id of touch move event