Squash commits for public release

kernel/include/algo/ringbuffer.h

@@ -0,0 +1,39 @@
+#ifndef _KERNEL_ALGO_RINGBUFFER_H
+#define _KERNEL_ALGO_RINGBUFFER_H
+
+#include <libkern/libkern.h>
+#include <libkern/lock.h>
+#include <mem/kmemzone.h>
+
+#define RINGBUFFER_STD_SIZE (16 * KB)
+
+struct __ringbuffer {
+    kmemzone_t zone;
+    size_t start;
+    size_t end;
+};
+typedef struct __ringbuffer ringbuffer_t;
+
+ringbuffer_t ringbuffer_create(size_t size);
+static ALWAYS_INLINE ringbuffer_t ringbuffer_create_std() { return ringbuffer_create(RINGBUFFER_STD_SIZE); }
+void ringbuffer_free(ringbuffer_t* rbuf);
+
+ssize_t ringbuffer_space_to_read_from(ringbuffer_t* rbuf, size_t start);
+ssize_t ringbuffer_space_to_read(ringbuffer_t* rbuf);
+ssize_t ringbuffer_space_to_write(ringbuffer_t* rbuf);
+
+size_t ringbuffer_read_from(ringbuffer_t* rbuf, size_t ustart, uint8_t __user* buf, size_t siz);
+size_t ringbuffer_read_user_from(ringbuffer_t* rbuf, size_t ustart, uint8_t __user* buf, size_t siz);
+size_t ringbuffer_read(ringbuffer_t* rbuf, uint8_t*, size_t);
+size_t ringbuffer_read_user(ringbuffer_t* rbuf, uint8_t __user* buf, size_t siz);
+
+size_t ringbuffer_write(ringbuffer_t* rbuf, const uint8_t*, size_t);
+size_t ringbuffer_write_user(ringbuffer_t* rbuf, const uint8_t __user* buf, size_t siz);
+size_t ringbuffer_write_ignore_bounds(ringbuffer_t* rbuf, const uint8_t* buf, size_t siz);
+size_t ringbuffer_write_user_ignore_bounds(ringbuffer_t* rbuf, const uint8_t* __user buf, size_t siz);
+
+size_t ringbuffer_read_one(ringbuffer_t* rbuf, uint8_t* data);
+size_t ringbuffer_write_one(ringbuffer_t* rbuf, uint8_t data);
+void ringbuffer_clear(ringbuffer_t* rbuf);
+
+#endif //_KERNEL_ALGO_RINGBUFFER_H