syscalls: new thread syscall

src/sys/syscalls/newthread.c

@@ -0,0 +1,34 @@
+#include <kernel/syscalls.h>
+#include <kernel/sched.h>
+#include <kernel/env.h>
+#include <arch/cls.h>
+
+syscallret syscall_newthread(void* nip, void* stack){
+	syscallret retv;
+	retv.ret = -1;
+
+	if(env_isset("nomultithread")){
+		retv.errno = ENOSYS;
+		return retv;
+	}
+	
+	thread_t* thread = arch_getcls()->thread;
+	proc_t* proc = thread->proc;
+
+	thread_t* new = sched_newuthread(nip, THREAD_DEFAULT_KSTACK_SIZE, stack, proc, false, THREAD_PRIORITY_USER);
+
+	if(!new){
+		retv.errno = ENOMEM;
+		return retv;
+	}	
+	
+	new->ctx = thread->ctx;
+	
+	sched_queuethread(new);
+
+	retv.errno = 0;
+	retv.ret = new->tid;
+
+	return retv;
+	
+}