diff --git a/linux/CMakeLists.txt b/linux/CMakeLists.txt
index d957856..fdbaeab 100644
--- a/linux/CMakeLists.txt
+++ b/linux/CMakeLists.txt
@@ -5,7 +5,7 @@ if (NOT "${CMAKE_SYSTEM}" MATCHES "Linux")
 endif ()
 
 set(PLATFORM_SOURCES list_devices.c linux.h device.c scsi.c usb.c ieee1394.c pcmcia.c ata.c sdhci.c ../unix/hello.c
-        ../unix/network.c ../unix/unix.c)
+        ../unix/network.c ../unix/unix.c mmc/ioctl.h)
 CHECK_LIBRARY_EXISTS("udev" udev_new "" HAS_UDEV)
 CHECK_INCLUDE_FILES("linux/mmc/ioctl.h" HAVE_MMC_IOCTL_H)
 
diff --git a/linux/mmc/ioctl.h b/linux/mmc/ioctl.h
new file mode 100644
index 0000000..c8e37b5
--- /dev/null
+++ b/linux/mmc/ioctl.h
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+
+#ifndef DICREMOTE_LINUX_MMC_IOCTL_H_
+#define DICREMOTE_LINUX_MMC_IOCTL_H_
+
+#ifdef HAS_UAPI_MMC
+#include <linux/major.h>
+#include <linux/mmc/ioctl.h>
+#else
+#include <stdint.h>
+
+#ifndef MMC_BLOCK_MAJOR
+#define MMC_BLOCK_MAJOR 179
+#endif
+
+struct mmc_ioc_cmd
+{
+    /*
+     * Direction of data: nonzero = write, zero = read.
+     * Bit 31 selects 'Reliable Write' for RPMB.
+     */
+    int write_flag;
+
+    /* Application-specific command.  true = precede with CMD55 */
+    int is_acmd;
+
+    uint32_t     opcode;
+    uint32_t     arg;
+    uint32_t     response[4]; /* CMD response */
+    unsigned int flags;
+    unsigned int blksz;
+    unsigned int blocks;
+
+    /*
+     * Sleep at least postsleep_min_us useconds, and at most
+     * postsleep_max_us useconds *after* issuing command.  Needed for
+     * some read commands for which cards have no other way of indicating
+     * they're ready for the next command (i.e. there is no equivalent of
+     * a "busy" indicator for read operations).
+     */
+    unsigned int postsleep_min_us;
+    unsigned int postsleep_max_us;
+
+    /*
+     * Override driver-computed timeouts.  Note the difference in units!
+     */
+    unsigned int data_timeout_ns;
+    unsigned int cmd_timeout_ms;
+
+    /*
+     * For 64-bit machines, the next member, ``__u64 data_ptr``, wants to
+     * be 8-byte aligned.  Make sure this struct is the same size when
+     * built for 32-bit.
+     */
+    uint32_t __pad;
+
+    /* DAT buffer */
+    uint64_t data_ptr;
+};
+#define mmc_ioc_cmd_set_data(ic, ptr) ic.data_ptr = (__u64)(unsigned long)ptr
+
+/**
+ * struct mmc_ioc_multi_cmd - multi command information
+ * @num_of_cmds: Number of commands to send. Must be equal to or less than
+ *	MMC_IOC_MAX_CMDS.
+ * @cmds: Array of commands with length equal to 'num_of_cmds'
+ */
+struct mmc_ioc_multi_cmd
+{
+    uint64_t           num_of_cmds;
+    struct mmc_ioc_cmd cmds[0];
+};
+
+#define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
+/*
+ * MMC_IOC_MULTI_CMD: Used to send an array of MMC commands described by
+ *	the structure mmc_ioc_multi_cmd. The MMC driver will issue all
+ *	commands in array in sequence to card.
+ */
+#define MMC_IOC_MULTI_CMD _IOWR(MMC_BLOCK_MAJOR, 1, struct mmc_ioc_multi_cmd)
+/*
+ * Since this ioctl is only meant to enhance (and not replace) normal access
+ * to the mmc bus device, an upper data transfer limit of MMC_IOC_MAX_BYTES
+ * is enforced per ioctl call.  For larger data transfers, use the normal
+ * block device operations.
+ */
+#define MMC_IOC_MAX_BYTES (512L * 1024)
+#define MMC_IOC_MAX_CMDS 255
+
+#endif
+#endif // DICREMOTE_LINUX_MMC_IOCTL_H_
diff --git a/linux/sdhci.c b/linux/sdhci.c
index 65a553f..660b2bb 100644
--- a/linux/sdhci.c
+++ b/linux/sdhci.c
@@ -17,13 +17,10 @@
 
 #include <stdint.h>
 
-#ifdef HAS_UAPI_MMC
 #include <errno.h>
-#include <linux/major.h>
-#include <linux/mmc/ioctl.h>
+#include "mmc/ioctl.h"
 #include <string.h>
 #include <sys/ioctl.h>
-#endif
 
 int32_t LinuxSendSdhciCommand(int       device_fd,
                               uint8_t   command,
@@ -39,9 +36,6 @@ int32_t LinuxSendSdhciCommand(int       device_fd,
                               uint32_t* duration,
                               uint32_t* sense)
 {
-#ifndef HAS_UAPI_MMC
-    return -1;
-#else
     struct mmc_ioc_cmd mmc_ioc_cmd;
     int32_t            error;
     *duration = 0;
@@ -74,5 +68,4 @@ int32_t LinuxSendSdhciCommand(int       device_fd,
     memcpy((char*)response, (char*)&mmc_ioc_cmd.response, sizeof(uint32_t) * 4);
 
     return error;
-#endif
 }
\ No newline at end of file