Created student weenix repository

1 files changed, 43 insertions, 0 deletions

diff --git a/kernel/drivers/chardev.c b/kernel/drivers/chardev.c
new file mode 100644
index 0000000..b8eb146
--- /dev/null
+++ b/kernel/drivers/chardev.c
@@ -0,0 +1,43 @@
+#include "drivers/chardev.h"
+#include "drivers/memdevs.h"
+#include "drivers/tty/tty.h"
+#include "kernel.h"
+#include "util/debug.h"
+
+static list_t chardevs = LIST_INITIALIZER(chardevs);
+
+void chardev_init()
+{
+    tty_init();
+    memdevs_init();
+}
+
+long chardev_register(chardev_t *dev)
+{
+    if (!dev || (NULL_DEVID == dev->cd_id) || !(dev->cd_ops))
+    {
+        return -1;
+    }
+    list_iterate(&chardevs, cd, chardev_t, cd_link)
+    {
+        if (dev->cd_id == cd->cd_id)
+        {
+            return -1;
+        }
+    }
+    list_insert_tail(&chardevs, &dev->cd_link);
+    return 0;
+}
+
+chardev_t *chardev_lookup(devid_t id)
+{
+    list_iterate(&chardevs, cd, chardev_t, cd_link)
+    {
+        KASSERT(NULL_DEVID != cd->cd_id);
+        if (id == cd->cd_id)
+        {
+            return cd;
+        }
+    }
+    return NULL;
+}