refactor(core): remove coreapp specific logic from applets

diff --git a/core/embed/projects/kernel/main.c b/core/embed/projects/kernel/main.c
index 966b8189..10532a4f 100644
--- a/core/embed/projects/kernel/main.c
+++ b/core/embed/projects/kernel/main.c
@@ -17,6 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <trezor_model.h>
 #include <trezor_rtl.h>
 
 #include <gfx/gfx_bitblt.h>
@@ -24,8 +25,8 @@
 #include <sec/random_delays.h>
 #include <sec/secret.h>
 #include <sec/secure_aes.h>
-#include <sys/applet.h>
 #include <sys/bootutils.h>
+#include <sys/coreapp.h>
 #include <sys/mpu.h>
 #include <sys/syscall_ipc.h>
 #include <sys/sysevent.h>
@@ -33,7 +34,6 @@
 #include <sys/systick.h>
 #include <util/board_capabilities.h>
 #include <util/boot_image.h>
-#include <util/image.h>
 #include <util/option_bytes.h>
 #include <util/rsod.h>
 #include <util/unit_properties.h>
@@ -54,6 +54,10 @@
 #include <io/haptic.h>
 #endif
 
+#ifdef USE_HASH_PROCESSOR
+#include <sec/hash_processor.h>
+#endif
+
 #ifdef USE_OPTIGA
 #include <sec/optiga_init.h>
 #endif
@@ -212,42 +216,6 @@ static void kernel_loop(applet_t *coreapp) {
   } while (applet_is_alive(coreapp));
 }
 
-// defined in linker script
-extern uint32_t _kernel_flash_end;
-#define KERNEL_END COREAPP_CODE_ALIGN((uint32_t) & _kernel_flash_end)
-
-// Initializes coreapp applet
-static void coreapp_init(applet_t *applet) {
-  const uint32_t CODE1_START = KERNEL_END;
-
-#ifdef FIRMWARE_P1_START
-  const uint32_t CODE1_END = FIRMWARE_P1_START + FIRMWARE_P1_MAXSIZE;
-#else
-  const uint32_t CODE1_END = FIRMWARE_START + FIRMWARE_MAXSIZE;
-#endif
-
-  const applet_layout_t coreapp_layout = {
-      .data1.start = (uint32_t)AUX1_RAM_START,
-      .data1.size = (uint32_t)AUX1_RAM_SIZE,
-#ifdef AUX2_RAM_START
-      .data2.start = (uint32_t)AUX2_RAM_START,
-      .data2.size = (uint32_t)AUX2_RAM_SIZE,
-#endif
-      .code1.start = CODE1_START,
-      .code1.size = CODE1_END - CODE1_START,
-#ifdef FIRMWARE_P2_START
-      .code2.start = FIRMWARE_P2_START,
-      .code2.size = FIRMWARE_P2_MAXSIZE,
-#endif
-  };
-
-  applet_privileges_t coreapp_privileges = {
-      .assets_area_access = true,
-  };
-
-  applet_init(applet, &coreapp_layout, &coreapp_privileges);
-}
-
 #ifndef USE_BOOTARGS_RSOD
 
 // Shows RSOD (Red Screen of Death)
@@ -257,7 +225,7 @@ static void show_rsod(const systask_postmortem_t *pminfo) {
   coreapp_init(&coreapp);
 
   // Reset and run the coreapp in RSOD mode
-  if (applet_reset(&coreapp, 1, pminfo, sizeof(systask_postmortem_t))) {
+  if (coreapp_reset(&coreapp, 1, pminfo, sizeof(systask_postmortem_t))) {
     // Run the applet & wait for it to finish
     applet_run(&coreapp);
     // Loop until the coreapp is terminated
@@ -320,12 +288,13 @@ int main(void) {
   coreapp_init(&coreapp);
 
   // Reset and run the coreapp
-  if (!applet_reset(&coreapp, 0, NULL, 0)) {
+  if (!coreapp_reset(&coreapp, 0, NULL, 0)) {
     error_shutdown("Cannot start coreapp");
   }
 
   // Run the applet
   applet_run(&coreapp);
+
   // Loop until the coreapp is terminated
   kernel_loop(&coreapp);
   // Release the coreapp resources
diff --git a/core/embed/sec/secure_aes/stm32u5/secure_aes_unpriv.c b/core/embed/sec/secure_aes/stm32u5/secure_aes_unpriv.c
index 7049acf8..dea1d8cf 100644
--- a/core/embed/sec/secure_aes/stm32u5/secure_aes_unpriv.c
+++ b/core/embed/sec/secure_aes/stm32u5/secure_aes_unpriv.c
@@ -110,6 +110,7 @@ __attribute((no_stack_protector)) void saes_unpriv_callback(void) {
 
 #ifdef KERNEL
 
+#include <sys/coreapp.h>
 #include <sys/mpu.h>
 #include <sys/systask.h>
 
@@ -144,11 +145,12 @@ secbool secure_aes_unpriv_encrypt(const uint8_t *input, size_t size,
 
   applet_t *applet = secure_aes_unpriv_applet;
 
-  const applet_header_t *header = (applet_header_t *)applet->layout.code1.start;
+  const coreapp_header_t *header =
+      (coreapp_header_t *)applet->layout.code1.start;
 
-  void *unpriv_input = header->coreapp.saes_input;
-  void *unpriv_output = header->coreapp.saes_output;
-  void *unpriv_callback = header->coreapp.saes_callback;
+  void *unpriv_input = header->saes_input;
+  void *unpriv_output = header->saes_output;
+  void *unpriv_callback = header->saes_callback;
 
   memzero(unpriv_input, SAES_DATA_SIZE_WITH_UNPRIV_KEY);
   memzero(unpriv_output, SAES_DATA_SIZE_WITH_UNPRIV_KEY);
diff --git a/core/embed/sys/task/inc/sys/applet.h b/core/embed/sys/task/inc/sys/applet.h
index 8565e97e..71acfc4b 100644
--- a/core/embed/sys/task/inc/sys/applet.h
+++ b/core/embed/sys/task/inc/sys/applet.h
@@ -25,28 +25,6 @@
 
 #include <sys/systask.h>
 
-// Applet entry point
-typedef void (*applet_startup_t)(const char* args, uint32_t random);
-
-// Applet header found at the beginning of the applet binary
-typedef struct {
-  // Applet entry point
-  applet_startup_t startup;
-  // Stack area
-  mpu_area_t stack;
-  // TLS area
-  mpu_area_t tls;
-  // Coreapp specific data
-  struct {
-    // Unprivileged SAES input buffer
-    void* saes_input;
-    // Unprivileged SAES output buffer
-    void* saes_output;
-    // Unprivileged SAES callback
-    void* saes_callback;
-  } coreapp;
-} applet_header_t;
-
 // Applet privileges
 typedef struct {
   bool assets_area_access;
@@ -68,15 +46,6 @@ typedef struct {
 void applet_init(applet_t* applet, const applet_layout_t* layout,
                  const applet_privileges_t* privileges);
 
-// Resets the applet and prepares it for execution from its entry point.
-//
-// Applet does not start immediately, it needs to be run by
-// `applet_run()` after calling this function.
-//
-// Returns `true` if the applet was successfully reset.
-bool applet_reset(applet_t* applet, uint32_t cmd, const void* arg,
-                  size_t arg_size);
-
 // Runs the applet and waits until it finishes.
 void applet_run(applet_t* applet);
 
diff --git a/core/embed/sys/task/inc/sys/coreapp.h b/core/embed/sys/task/inc/sys/coreapp.h
new file mode 100644
index 00000000..bb550a5a
--- /dev/null
+++ b/core/embed/sys/task/inc/sys/coreapp.h
@@ -0,0 +1,64 @@
+/*
+ * 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/>.
+ */
+
+#pragma once
+
+#ifdef KERNEL_MODE
+
+#include <trezor_types.h>
+
+#include <sys/applet.h>
+#include <sys/mpu.h>
+
+// Coreapp entry point
+typedef void (*coreapp_startup_t)(const char* args, uint32_t random);
+
+// Applet header found at the beginning of the coreapp binary
+typedef struct {
+  // Applet entry point
+  coreapp_startup_t startup;
+  // Stack area
+  mpu_area_t stack;
+  // TLS area
+  mpu_area_t tls;
+  // Unprivileged SAES input buffer
+  void* saes_input;
+  // Unprivileged SAES output buffer
+  void* saes_output;
+  // Unprivileged SAES callback
+  void* saes_callback;
+} coreapp_header_t;
+
+// Initializes the coreapp applet structure
+void coreapp_init(applet_t* applet);
+
+// Resets the coreapp and prepares it for execution from its entry point.
+//
+// Coreapp does not start immediately, it needs to be run by
+// `applet_run()` after calling this function.
+//
+// Returns `true` if the applet was successfully reset.
+bool coreapp_reset(applet_t* applet, uint32_t cmd, const void* arg,
+                   size_t arg_size);
+
+mpu_area_t coreapp_get_code_area(void);
+
+mpu_area_t coreapp_get_tls_area(void);
+
+#endif  // KERNEL_MODE
diff --git a/core/embed/sys/task/stm32/applet.c b/core/embed/sys/task/stm32/applet.c
index c8ee25b5..3d00cdf0 100644
--- a/core/embed/sys/task/stm32/applet.c
+++ b/core/embed/sys/task/stm32/applet.c
@@ -40,47 +40,6 @@ void applet_init(applet_t* applet, const applet_layout_t* layout,
   applet->privileges = *privileges;
 }
 
-static void applet_clear_memory(applet_t* applet) {
-  mpu_set_active_applet(&applet->layout);
-
-  if (applet->layout.data1.size > 0) {
-    memset((void*)applet->layout.data1.start, 0, applet->layout.data1.size);
-  }
-  if (applet->layout.data2.size > 0) {
-    memset((void*)applet->layout.data2.start, 0, applet->layout.data2.size);
-  }
-}
-
-bool applet_reset(applet_t* applet, uint32_t cmd, const void* arg,
-                  size_t arg_size) {
-  // Clear all memory the applet is allowed to use
-  applet_clear_memory(applet);
-
-  const applet_header_t* header = (applet_header_t*)applet->layout.code1.start;
-
-  // Reset the applet task (stack pointer, etc.)
-  if (!systask_init(&applet->task, header->stack.start, header->stack.size, 0,
-                    applet)) {
-    return false;
-  }
-
-  // Copy the arguments onto the applet stack
-  void* arg_copy = NULL;
-  if (arg != NULL && arg_size > 0) {
-    arg_copy = systask_push_data(&applet->task, arg, arg_size);
-    if (arg_copy == NULL) {
-      return false;
-    }
-  }
-
-  // Schedule the applet task run
-  uint32_t arg1 = cmd;
-  uint32_t arg2 = (uint32_t)arg_copy;
-  uint32_t arg3 = rng_get();
-
-  return systask_push_call(&applet->task, header->startup, arg1, arg2, arg3);
-}
-
 #ifdef USE_TRUSTZONE
 // Sets unprivileged access to the applet memory regions
 // and allows applet to use some specific peripherals.
diff --git a/core/embed/sys/task/stm32/coreapp.c b/core/embed/sys/task/stm32/coreapp.c
new file mode 100644
index 00000000..c3764471
--- /dev/null
+++ b/core/embed/sys/task/stm32/coreapp.c
@@ -0,0 +1,124 @@
+/*
+ * 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/>.
+ */
+
+#ifdef KERNEL
+
+#include <trezor_rtl.h>
+
+#include <sec/rng.h>
+#include <sys/applet.h>
+#include <sys/coreapp.h>
+#include <sys/mpu.h>
+#include <sys/systask.h>
+#include <util/image.h>
+
+static mpu_area_t coreapp_code_area;
+static mpu_area_t coreapp_tls_area;
+
+// defined in linker script
+extern uint32_t _kernel_flash_end;
+#define KERNEL_END COREAPP_CODE_ALIGN((uint32_t) & _kernel_flash_end)
+
+// Initializes coreapp applet
+void coreapp_init(applet_t* applet) {
+  const uint32_t CODE1_START = KERNEL_END;
+
+#ifdef FIRMWARE_P1_START
+  const uint32_t CODE1_END = FIRMWARE_P1_START + FIRMWARE_P1_MAXSIZE;
+#else
+  const uint32_t CODE1_END = FIRMWARE_START + FIRMWARE_MAXSIZE;
+#endif
+
+  const applet_layout_t coreapp_layout = {
+      .data1.start = (uint32_t)AUX1_RAM_START,
+      .data1.size = (uint32_t)AUX1_RAM_SIZE,
+#ifdef AUX2_RAM_START
+      .data2.start = (uint32_t)AUX2_RAM_START,
+      .data2.size = (uint32_t)AUX2_RAM_SIZE,
+#endif
+      .code1.start = CODE1_START,
+      .code1.size = CODE1_END - CODE1_START,
+#ifdef FIRMWARE_P2_START
+      .code2.start = FIRMWARE_P2_START,
+      .code2.size = FIRMWARE_P2_MAXSIZE,
+#endif
+  };
+
+  applet_privileges_t coreapp_privileges = {
+      .assets_area_access = true,
+  };
+
+  applet_init(applet, &coreapp_layout, &coreapp_privileges);
+}
+
+static void coreapp_clear_memory(applet_t* applet) {
+  if (applet->layout.data1.size > 0) {
+    memset((void*)applet->layout.data1.start, 0, applet->layout.data1.size);
+  }
+  if (applet->layout.data2.size > 0) {
+    memset((void*)applet->layout.data2.start, 0, applet->layout.data2.size);
+  }
+}
+
+bool coreapp_reset(applet_t* applet, uint32_t cmd, const void* arg,
+                   size_t arg_size) {
+  // Enable access to coreapp memory regions
+  mpu_set_active_applet(&applet->layout);
+
+  // Clear all memory the applet is allowed to use
+  coreapp_clear_memory(applet);
+
+  const coreapp_header_t* header =
+      (coreapp_header_t*)applet->layout.code1.start;
+
+  // Remember code and TLS areas
+  // (we will need then later for extension applets)
+  coreapp_tls_area = header->tls;
+  coreapp_code_area = applet->layout.code1;
+
+  // Reset the applet task (stack pointer, etc.)
+  if (!systask_init(&applet->task, header->stack.start, header->stack.size, 0,
+                    applet)) {
+    return false;
+  }
+
+  systask_enable_tls(&applet->task, header->tls);
+
+  // Copy the arguments onto the applet stack
+  void* arg_copy = NULL;
+  if (arg != NULL && arg_size > 0) {
+    arg_copy = systask_push_data(&applet->task, arg, arg_size);
+    if (arg_copy == NULL) {
+      return false;
+    }
+  }
+
+  // Schedule the applet task run
+  uint32_t arg1 = cmd;
+  uint32_t arg2 = (uint32_t)arg_copy;
+  uint32_t arg3 = rng_get();
+
+  return systask_push_call(&applet->task, header->startup, arg1, arg2, arg3);
+}
+
+mpu_area_t coreapp_get_code_area(void) { return coreapp_code_area; }
+
+mpu_area_t coreapp_get_tls_area(void) { return coreapp_tls_area; }
+
+#endif  // KERNEL
diff --git a/core/site_scons/models/stm32f4_common.py b/core/site_scons/models/stm32f4_common.py
index 355a0808..3ea8485e 100644
--- a/core/site_scons/models/stm32f4_common.py
+++ b/core/site_scons/models/stm32f4_common.py
@@ -91,6 +91,7 @@ def stm32f4_common_files(env, features_wanted, defines, sources, paths):
         "embed/sys/syscall/stm32/syscall_stubs.c",
         "embed/sys/syscall/stm32/syscall_verifiers.c",
         "embed/sys/task/stm32/applet.c",
+        "embed/sys/task/stm32/coreapp.c",
         "embed/sys/task/stm32/systask.c",
         "embed/sys/task/stm32/system.c",
         "embed/sys/time/stm32/systick.c",
diff --git a/core/site_scons/models/stm32u5_common.py b/core/site_scons/models/stm32u5_common.py
index ec51ed0b..e5ba1da0 100644
--- a/core/site_scons/models/stm32u5_common.py
+++ b/core/site_scons/models/stm32u5_common.py
@@ -152,6 +152,7 @@ def stm32u5_common_files(env, features_wanted, defines, sources, paths):
 
     if "applet" in features_wanted:
         sources += ["embed/sys/task/stm32/applet.c"]
+        sources += ["embed/sys/task/stm32/coreapp.c"]
 
     if "usb" in features_wanted:
         sources += [