1 files changed, 105 insertions, 0 deletions
diff --git a/ports/rp2/mpthreadport.c b/ports/rp2/mpthreadport.c
new file mode 100644
index 000000000..fb4428772
--- /dev/null
+++ b/ports/rp2/mpthreadport.c
@@ -0,0 +1,105 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020-2021 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/runtime.h"
+#include "py/gc.h"
+#include "py/mpthread.h"
+#include "pico/stdlib.h"
+#include "pico/multicore.h"
+
+#if MICROPY_PY_THREAD
+
+extern uint8_t __StackTop, __StackBottom;
+
+void *core_state[2];
+
+STATIC void *(*core1_entry)(void *) = NULL;
+STATIC void *core1_arg = NULL;
+STATIC uint32_t *core1_stack = NULL;
+STATIC size_t core1_stack_num_words = 0;
+
+void mp_thread_init(void) {
+    mp_thread_set_state(&mp_state_ctx.thread);
+    core1_entry = NULL;
+}
+
+void mp_thread_gc_others(void) {
+    if (get_core_num() == 0) {
+        // GC running on core0, trace core1's stack, if it's running.
+        if (core1_entry != NULL) {
+            gc_collect_root((void **)core1_stack, core1_stack_num_words);
+        }
+    } else {
+        // GC running on core1, trace core0's stack.
+        gc_collect_root((void **)&__StackBottom, (&__StackTop - &__StackBottom) / sizeof(uintptr_t));
+    }
+}
+
+STATIC void core1_entry_wrapper(void) {
+    if (core1_entry) {
+        core1_entry(core1_arg);
+    }
+    core1_entry = NULL;
+    // returning from here will loop the core forever (WFI)
+}
+
+void mp_thread_create(void *(*entry)(void *), void *arg, size_t *stack_size) {
+    // Check if core1 is already in use.
+    if (core1_entry != NULL) {
+        mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("core1 in use"));
+    }
+
+    core1_entry = entry;
+    core1_arg = arg;
+
+    if (*stack_size == 0) {
+        *stack_size = 4096; // default stack size
+    } else if (*stack_size < 2048) {
+        *stack_size = 2048; // minimum stack size
+    }
+
+    // Round stack size to a multiple of the word size.
+    core1_stack_num_words = *stack_size / sizeof(uint32_t);
+    *stack_size = core1_stack_num_words * sizeof(uint32_t);
+
+    // Allocate stack.
+    core1_stack = m_new(uint32_t, core1_stack_num_words);
+
+    // Create thread on core1.
+    multicore_reset_core1();
+    multicore_launch_core1_with_stack(core1_entry_wrapper, core1_stack, *stack_size);
+
+    // Adjust stack_size to provide room to recover from hitting the limit.
+    *stack_size -= 512;
+}
+
+void mp_thread_start(void) {
+}
+
+void mp_thread_finish(void) {
+}
+
+#endif // MICROPY_PY_THREAD