arch: microblaze: Thread Creation and Termination

Internal references: FWRIVERHD-4973

Signed-off-by: Alp Sayin <alpsayin@gmail.com>

Author: alpsayin

arch/microblaze/core/thread.c

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2023 Advanced Micro Devices, Inc. (AMD)
+ * Copyright (c) 2023 Alp Sayin <alpsayin@gmail.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+
+#include <zephyr/kernel.h>
+
+void z_thread_entry(k_thread_entry_t thread, void *arg1, void *arg2, void *arg3);
+
+void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack, char *stack_ptr,
+				 k_thread_entry_t entry, void *arg1, void *arg2, void *arg3)
+{
+	struct __esf *stack_init;
+
+	/* Initial stack frame for thread */
+	stack_init =
+		(struct __esf *)Z_STACK_PTR_ALIGN(Z_STACK_PTR_TO_FRAME(struct __esf, stack_ptr));
+
+	/* Setup the initial stack frame */
+	stack_init->r5 = (uint32_t)entry;
+	stack_init->r6 = (uint32_t)arg1;
+	stack_init->r7 = (uint32_t)arg2;
+	stack_init->r8 = (uint32_t)arg3;
+	stack_init->r14 = (uint32_t)z_thread_entry;
+
+	/* Initialise the stack to stack_init */
+	thread->callee_saved.r1 = (uint32_t)stack_init;
+	/* Threads start with irq_unlocked */
+	thread->callee_saved.key = 1;
+	/* and return value set to default */
+	thread->callee_saved.retval = -EAGAIN;
+}
+
+/**
+ * @brief can be used as a safe stub for thread_abort implementation
+ *
+ * @return FUNC_NORETURN
+ */
+FUNC_NORETURN void arch_thread_sleep_forever(void)
+{
+	k_sleep(K_FOREVER);
+	CODE_UNREACHABLE;
+}