organize device drivers into subdirectories

kernel/device/sys/debugconsole.c

@@ -0,0 +1,32 @@
+#include <device/device.h>
+#include <device/sys/debugconsole.h>
+#include <libk/std.h>
+#include <proc/proc.h>
+#include <proc/reschedule.h>
+#include <status.h>
+#include <sys/debug.h>
+
+DEFINE_DEVICE_INIT (debugconsole_init) {
+  (void)device, (void)arg, (void)proc, (void)rctx;
+  return true;
+}
+
+DEFINE_DEVICE_FINI (debugconsole_fini) {}
+
+DEFINE_DEVICE_OP (debugconsole_putstr) {
+  uint64_t fp;
+
+  char* string = (char*)a1;
+  size_t* len = (size_t*)a2;
+
+  if (string == NULL || len == NULL)
+    return -ST_BAD_ADDRESS_SPACE;
+
+  spin_lock (&proc->lock, &fp);
+  int pid = proc->pid;
+  spin_unlock (&proc->lock, fp);
+
+  debugprintf ("(CPU %d; PID %d) %.*s", thiscpu->id, pid, (int)*len, string);
+
+  return ST_OK;
+}