#include "../../wrapper/ringbuffer/backend_types.h"
#include "../../wrapper/ringbuffer/frontend_types.h"
#include <linux/string.h>
+#include <linux/uaccess.h>
/* Ring buffer backend API presented to the frontend */
extern void _lib_ring_buffer_write(struct lib_ring_buffer_backend *bufb,
size_t offset, const void *src, size_t len,
ssize_t pagecpy);
+extern void _lib_ring_buffer_memset(struct lib_ring_buffer_backend *bufb,
+ size_t offset, int c, size_t len,
+ ssize_t pagecpy);
+extern void _lib_ring_buffer_copy_from_user(struct lib_ring_buffer_backend *bufb,
+ size_t offset, const void *src,
+ size_t len, ssize_t pagecpy);
/*
* Subbuffer ID bits for overwrite mode. Need to fit within a single word to be
inline_memcpy(dest, src, __len); \
} while (0)
+/*
+ * We use __copy_from_user to copy userspace data since we already
+ * did the access_ok for the whole range.
+ */
+static inline
+unsigned long lib_ring_buffer_do_copy_from_user(void *dest,
+ const void __user *src,
+ unsigned long len)
+{
+ return __copy_from_user(dest, src, len);
+}
+
+/*
+ * write len bytes to dest with c
+ */
+static inline
+void lib_ring_buffer_do_memset(char *dest, int c,
+ unsigned long len)
+{
+ unsigned long i;
+
+ for (i = 0; i < len; i++)
+ dest[i] = c;
+}
+
#endif /* _LINUX_RING_BUFFER_BACKEND_INTERNAL_H */