+#if WITH_CONSISTENT_DBG
+/*
+ * xnu shared memory hardware debugger support
+ *
+ * A hardware debugger can connect, read the consistent debug
+ * header to determine the physical location of the handshake
+ * structure and communicate using commands in the structure as
+ * defined below.
+ *
+ * Currently used for sending compressed coredumps to
+ * astris.
+ */
+struct xnu_hw_shmem_dbg_command_info {
+ volatile uint32_t xhsdci_status;
+ uint32_t xhsdci_seq_no;
+ volatile uint64_t xhsdci_buf_phys_addr;
+ volatile uint32_t xhsdci_buf_data_length;
+ /* end of version 0 structure */
+ uint64_t xhsdci_coredump_total_size_uncomp;
+ uint64_t xhsdci_coredump_total_size_sent_uncomp;
+ uint32_t xhsdci_page_size;
+} __attribute__((packed));
+
+#define CUR_XNU_HWSDCI_STRUCT_VERS 1
+
+#define XHSDCI_STATUS_NONE 0 /* default status */
+#define XHSDCI_STATUS_KERNEL_BUSY 1 /* kernel is busy with other procedure */
+#define XHSDCI_STATUS_KERNEL_READY 2 /* kernel ready to begin command */
+#define XHSDCI_COREDUMP_BEGIN 3 /* indicates hardware debugger is ready to begin consuming coredump info */
+#define XHSDCI_COREDUMP_BUF_READY 4 /* indicates the kernel has populated the buffer */
+#define XHSDCI_COREDUMP_BUF_EMPTY 5 /* indicates hardware debugger is done consuming the current data */
+#define XHSDCI_COREDUMP_STATUS_DONE 6 /* indicates last compressed data is in buffer */
+#define XHSDCI_COREDUMP_ERROR 7 /* indicates an error was encountered */
+#define XHSDCI_COREDUMP_REMOTE_DONE 8 /* indicates that hardware debugger is done */
+
+#endif /* WITH_CONSISTENT_DBG */