diff --git a/libc/kernel/uapi/linux/mmc/ioctl.h b/libc/kernel/uapi/linux/mmc/ioctl.h
new file mode 100644
index 0000000..1bd0204
--- /dev/null
+++ b/libc/kernel/uapi/linux/mmc/ioctl.h
@@ -0,0 +1,46 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   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 LINUX_MMC_IOCTL_H
+#define LINUX_MMC_IOCTL_H
+#include <linux/types.h>
+struct mmc_ioc_cmd {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int write_flag;
+ int is_acmd;
+ __u32 opcode;
+ __u32 arg;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u32 response[4];
+ unsigned int flags;
+ unsigned int blksz;
+ unsigned int blocks;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ unsigned int postsleep_min_us;
+ unsigned int postsleep_max_us;
+ unsigned int data_timeout_ns;
+ unsigned int cmd_timeout_ms;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u32 __pad;
+ __u64 data_ptr;
+};
+#define mmc_ioc_cmd_set_data(ic, ptr) ic.data_ptr = (__u64)(unsigned long) ptr
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
+#define MMC_IOC_MAX_BYTES (512L * 256)
+#endif