io: kiss I/O thread goodbye

arch/at91sam3x8e/Makefile

@@ -38,8 +38,7 @@ ARDIX_SOURCES += \
 
 ARDIX_ASM_SOURCES += \
 	$(ARDIX_ARCH_PWD)/irq_pend_sv.S \
-	$(ARDIX_ARCH_PWD)/irq_svc.S \
-	$(ARDIX_ARCH_PWD)/syscall.S
+	$(ARDIX_ARCH_PWD)/irq_svc.S
 
 CFLAGS += \
 	-DARCH_AT91SAM3X8E

include/ardix/io.h

@@ -6,21 +6,13 @@
 #include <ardix/serial.h>
 
 /**
- * Initialize the I/O thread and subsystems.
- * Must be called after all I/O components have been initialized.
+ * Initialize all basic I/O subsystems.
+ * After a successful return, printk() will be available.
  *
  * @returns 0 on success, or a negative number on failure.
  */
 int io_init(void);
 
-/**
- * Update the hardware serial buffers if necessary.
- * This includes copying to and from the main ring buffers.
- *
- * @param interface: The serial interface.
- */
-void io_serial_buf_update(struct serial_interface *interface);
-
 /*
  * Copyright (c) 2020 Felix Kopp <sandtler@sandtler.club>
  *

kernel/io/io.c

@@ -1,35 +1,14 @@
 /* SPDX-License-Identifier: BSD-3-Clause */
 /* See the end of this file for copyright, licensing, and warranty information. */
 
-#include <arch/serial.h>
-
 #include <ardix/io.h>
-#include <ardix/sched.h>
 #include <ardix/serial.h>
 
-#include <toolchain.h>
-
-static __naked void io_thread_entry(void)
-{
-	while (1) {
-		io_serial_buf_update(serial_default_interface);
-
-		sched_yield(PROC_QUEUE);
-	}
-}
-
 int io_init(void)
 {
 	int ret;
-	struct process *proc;
 
 	ret = serial_init(serial_default_interface, CONFIG_SERIAL_BAUD);
-	if (ret)
-		return ret;
-
-	proc = sched_process_create(&io_thread_entry);
-	if (proc == NULL)
-		ret = -1;
 
 	return ret;
 }