Created student weenix repository

1 files changed, 51 insertions, 0 deletions

diff --git a/kernel/include/drivers/chardev.h b/kernel/include/drivers/chardev.h
new file mode 100644
index 0000000..f6083d8
--- /dev/null
+++ b/kernel/include/drivers/chardev.h
@@ -0,0 +1,51 @@
+#pragma once
+
+#include "drivers/dev.h"
+#include "util/list.h"
+
+struct vnode;
+struct pframe;
+
+struct chardev_ops;
+struct mobj;
+
+typedef struct chardev
+{
+    devid_t cd_id;
+    struct chardev_ops *cd_ops;
+    list_link_t cd_link;
+} chardev_t;
+
+typedef struct chardev_ops
+{
+    ssize_t (*read)(chardev_t *dev, size_t pos, void *buf, size_t count);
+
+    ssize_t (*write)(chardev_t *dev, size_t pos, const void *buf, size_t count);
+
+    long (*mmap)(struct vnode *file, struct mobj **ret);
+
+    long (*fill_pframe)(struct vnode *file, struct pframe *pf);
+
+    long (*flush_pframe)(struct vnode *file, struct pframe *pf);
+} chardev_ops_t;
+
+/**
+ * Initializes the byte device subsystem.
+ */
+void chardev_init(void);
+
+/**
+ * Registers the given byte device.
+ *
+ * @param dev the byte device to register
+ */
+long chardev_register(chardev_t *dev);
+
+/**
+ * Finds a byte device with a given device id.
+ *
+ * @param id the device id of the byte device to find
+ * @return the byte device with the given id if it exists, or NULL if
+ * it cannot be found
+ */
+chardev_t *chardev_lookup(devid_t id);