diff --git a/libc/kernel/uapi/linux/hdlcdrv.h b/libc/kernel/uapi/linux/hdlcdrv.h
new file mode 100644
index 0000000..a37201d
--- /dev/null
+++ b/libc/kernel/uapi/linux/hdlcdrv.h
@@ -0,0 +1,101 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _UAPI_HDLCDRV_H
+#define _UAPI_HDLCDRV_H
+struct hdlcdrv_params {
+ int iobase;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int irq;
+ int dma;
+ int dma2;
+ int seriobase;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int pariobase;
+ int midiiobase;
+};
+struct hdlcdrv_channel_params {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int tx_delay;
+ int tx_tail;
+ int slottime;
+ int ppersist;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int fulldup;
+};
+struct hdlcdrv_old_channel_state {
+ int ptt;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int dcd;
+ int ptt_keyed;
+};
+struct hdlcdrv_channel_state {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int ptt;
+ int dcd;
+ int ptt_keyed;
+ unsigned long tx_packets;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ unsigned long tx_errors;
+ unsigned long rx_packets;
+ unsigned long rx_errors;
+};
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct hdlcdrv_ioctl {
+ int cmd;
+ union {
+ struct hdlcdrv_params mp;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ struct hdlcdrv_channel_params cp;
+ struct hdlcdrv_channel_state cs;
+ struct hdlcdrv_old_channel_state ocs;
+ unsigned int calibrate;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ unsigned char bits;
+ char modename[128];
+ char drivername[32];
+ } data;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+};
+#define HDLCDRVCTL_GETMODEMPAR 0
+#define HDLCDRVCTL_SETMODEMPAR 1
+#define HDLCDRVCTL_MODEMPARMASK 2
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define HDLCDRVCTL_GETCHANNELPAR 10
+#define HDLCDRVCTL_SETCHANNELPAR 11
+#define HDLCDRVCTL_OLDGETSTAT 20
+#define HDLCDRVCTL_CALIBRATE 21
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define HDLCDRVCTL_GETSTAT 22
+#define HDLCDRVCTL_GETSAMPLES 30
+#define HDLCDRVCTL_GETBITS 31
+#define HDLCDRVCTL_GETMODE 40
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define HDLCDRVCTL_SETMODE 41
+#define HDLCDRVCTL_MODELIST 42
+#define HDLCDRVCTL_DRIVERNAME 43
+#define HDLCDRV_PARMASK_IOBASE (1<<0)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define HDLCDRV_PARMASK_IRQ (1<<1)
+#define HDLCDRV_PARMASK_DMA (1<<2)
+#define HDLCDRV_PARMASK_DMA2 (1<<3)
+#define HDLCDRV_PARMASK_SERIOBASE (1<<4)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define HDLCDRV_PARMASK_PARIOBASE (1<<5)
+#define HDLCDRV_PARMASK_MIDIIOBASE (1<<6)
+#endif