diff --git a/hw/misc/macio/mac_dbdma.c b/hw/misc/macio/mac_dbdma.c
index 566185d..c2f15d8 100644
--- a/hw/misc/macio/mac_dbdma.c
+++ b/hw/misc/macio/mac_dbdma.c
@@ -54,123 +54,6 @@
 /*
  */
 
-/*
- * DBDMA control/status registers.  All little-endian.
- */
-
-#define DBDMA_CONTROL         0x00
-#define DBDMA_STATUS          0x01
-#define DBDMA_CMDPTR_HI       0x02
-#define DBDMA_CMDPTR_LO       0x03
-#define DBDMA_INTR_SEL        0x04
-#define DBDMA_BRANCH_SEL      0x05
-#define DBDMA_WAIT_SEL        0x06
-#define DBDMA_XFER_MODE       0x07
-#define DBDMA_DATA2PTR_HI     0x08
-#define DBDMA_DATA2PTR_LO     0x09
-#define DBDMA_RES1            0x0A
-#define DBDMA_ADDRESS_HI      0x0B
-#define DBDMA_BRANCH_ADDR_HI  0x0C
-#define DBDMA_RES2            0x0D
-#define DBDMA_RES3            0x0E
-#define DBDMA_RES4            0x0F
-
-#define DBDMA_REGS            16
-#define DBDMA_SIZE            (DBDMA_REGS * sizeof(uint32_t))
-
-#define DBDMA_CHANNEL_SHIFT   7
-#define DBDMA_CHANNEL_SIZE    (1 << DBDMA_CHANNEL_SHIFT)
-
-#define DBDMA_CHANNELS        (0x1000 >> DBDMA_CHANNEL_SHIFT)
-
-/* Bits in control and status registers */
-
-#define RUN        0x8000
-#define PAUSE      0x4000
-#define FLUSH      0x2000
-#define WAKE       0x1000
-#define DEAD       0x0800
-#define ACTIVE     0x0400
-#define BT         0x0100
-#define DEVSTAT    0x00ff
-
-/*
- * DBDMA command structure.  These fields are all little-endian!
- */
-
-typedef struct dbdma_cmd {
-    uint16_t req_count;          /* requested byte transfer count */
-    uint16_t command;            /* command word (has bit-fields) */
-    uint32_t phy_addr;           /* physical data address */
-    uint32_t cmd_dep;            /* command-dependent field */
-    uint16_t res_count;          /* residual count after completion */
-    uint16_t xfer_status;        /* transfer status */
-} dbdma_cmd;
-
-/* DBDMA command values in command field */
-
-#define COMMAND_MASK    0xf000
-#define OUTPUT_MORE     0x0000        /* transfer memory data to stream */
-#define OUTPUT_LAST     0x1000        /* ditto followed by end marker */
-#define INPUT_MORE      0x2000        /* transfer stream data to memory */
-#define INPUT_LAST      0x3000        /* ditto, expect end marker */
-#define STORE_WORD      0x4000        /* write word (4 bytes) to device reg */
-#define LOAD_WORD       0x5000        /* read word (4 bytes) from device reg */
-#define DBDMA_NOP       0x6000        /* do nothing */
-#define DBDMA_STOP      0x7000        /* suspend processing */
-
-/* Key values in command field */
-
-#define KEY_MASK        0x0700
-#define KEY_STREAM0     0x0000        /* usual data stream */
-#define KEY_STREAM1     0x0100        /* control/status stream */
-#define KEY_STREAM2     0x0200        /* device-dependent stream */
-#define KEY_STREAM3     0x0300        /* device-dependent stream */
-#define KEY_STREAM4     0x0400        /* reserved */
-#define KEY_REGS        0x0500        /* device register space */
-#define KEY_SYSTEM      0x0600        /* system memory-mapped space */
-#define KEY_DEVICE      0x0700        /* device memory-mapped space */
-
-/* Interrupt control values in command field */
-
-#define INTR_MASK       0x0030
-#define INTR_NEVER      0x0000        /* don't interrupt */
-#define INTR_IFSET      0x0010        /* intr if condition bit is 1 */
-#define INTR_IFCLR      0x0020        /* intr if condition bit is 0 */
-#define INTR_ALWAYS     0x0030        /* always interrupt */
-
-/* Branch control values in command field */
-
-#define BR_MASK         0x000c
-#define BR_NEVER        0x0000        /* don't branch */
-#define BR_IFSET        0x0004        /* branch if condition bit is 1 */
-#define BR_IFCLR        0x0008        /* branch if condition bit is 0 */
-#define BR_ALWAYS       0x000c        /* always branch */
-
-/* Wait control values in command field */
-
-#define WAIT_MASK       0x0003
-#define WAIT_NEVER      0x0000        /* don't wait */
-#define WAIT_IFSET      0x0001        /* wait if condition bit is 1 */
-#define WAIT_IFCLR      0x0002        /* wait if condition bit is 0 */
-#define WAIT_ALWAYS     0x0003        /* always wait */
-
-typedef struct DBDMA_channel {
-    int channel;
-    uint32_t regs[DBDMA_REGS];
-    qemu_irq irq;
-    DBDMA_io io;
-    DBDMA_rw rw;
-    DBDMA_flush flush;
-    dbdma_cmd current;
-    int processing;
-} DBDMA_channel;
-
-typedef struct {
-    MemoryRegion mem;
-    DBDMA_channel channels[DBDMA_CHANNELS];
-} DBDMAState;
-
 #ifdef DEBUG_DBDMA
 static void dump_dbdma_cmd(dbdma_cmd *cmd)
 {
diff --git a/include/hw/ppc/mac_dbdma.h b/include/hw/ppc/mac_dbdma.h
index 691263e..90be5d9 100644
--- a/include/hw/ppc/mac_dbdma.h
+++ b/include/hw/ppc/mac_dbdma.h
@@ -39,6 +39,124 @@ struct DBDMA_io {
     DBDMA_end dma_end;
 };
 
+/*
+ * DBDMA control/status registers.  All little-endian.
+ */
+
+#define DBDMA_CONTROL         0x00
+#define DBDMA_STATUS          0x01
+#define DBDMA_CMDPTR_HI       0x02
+#define DBDMA_CMDPTR_LO       0x03
+#define DBDMA_INTR_SEL        0x04
+#define DBDMA_BRANCH_SEL      0x05
+#define DBDMA_WAIT_SEL        0x06
+#define DBDMA_XFER_MODE       0x07
+#define DBDMA_DATA2PTR_HI     0x08
+#define DBDMA_DATA2PTR_LO     0x09
+#define DBDMA_RES1            0x0A
+#define DBDMA_ADDRESS_HI      0x0B
+#define DBDMA_BRANCH_ADDR_HI  0x0C
+#define DBDMA_RES2            0x0D
+#define DBDMA_RES3            0x0E
+#define DBDMA_RES4            0x0F
+
+#define DBDMA_REGS            16
+#define DBDMA_SIZE            (DBDMA_REGS * sizeof(uint32_t))
+
+#define DBDMA_CHANNEL_SHIFT   7
+#define DBDMA_CHANNEL_SIZE    (1 << DBDMA_CHANNEL_SHIFT)
+
+#define DBDMA_CHANNELS        (0x1000 >> DBDMA_CHANNEL_SHIFT)
+
+/* Bits in control and status registers */
+
+#define RUN        0x8000
+#define PAUSE      0x4000
+#define FLUSH      0x2000
+#define WAKE       0x1000
+#define DEAD       0x0800
+#define ACTIVE     0x0400
+#define BT         0x0100
+#define DEVSTAT    0x00ff
+
+/*
+ * DBDMA command structure.  These fields are all little-endian!
+ */
+
+typedef struct dbdma_cmd {
+    uint16_t req_count;          /* requested byte transfer count */
+    uint16_t command;            /* command word (has bit-fields) */
+    uint32_t phy_addr;           /* physical data address */
+    uint32_t cmd_dep;            /* command-dependent field */
+    uint16_t res_count;          /* residual count after completion */
+    uint16_t xfer_status;        /* transfer status */
+} dbdma_cmd;
+
+/* DBDMA command values in command field */
+
+#define COMMAND_MASK    0xf000
+#define OUTPUT_MORE     0x0000        /* transfer memory data to stream */
+#define OUTPUT_LAST     0x1000        /* ditto followed by end marker */
+#define INPUT_MORE      0x2000        /* transfer stream data to memory */
+#define INPUT_LAST      0x3000        /* ditto, expect end marker */
+#define STORE_WORD      0x4000        /* write word (4 bytes) to device reg */
+#define LOAD_WORD       0x5000        /* read word (4 bytes) from device reg */
+#define DBDMA_NOP       0x6000        /* do nothing */
+#define DBDMA_STOP      0x7000        /* suspend processing */
+
+/* Key values in command field */
+
+#define KEY_MASK        0x0700
+#define KEY_STREAM0     0x0000        /* usual data stream */
+#define KEY_STREAM1     0x0100        /* control/status stream */
+#define KEY_STREAM2     0x0200        /* device-dependent stream */
+#define KEY_STREAM3     0x0300        /* device-dependent stream */
+#define KEY_STREAM4     0x0400        /* reserved */
+#define KEY_REGS        0x0500        /* device register space */
+#define KEY_SYSTEM      0x0600        /* system memory-mapped space */
+#define KEY_DEVICE      0x0700        /* device memory-mapped space */
+
+/* Interrupt control values in command field */
+
+#define INTR_MASK       0x0030
+#define INTR_NEVER      0x0000        /* don't interrupt */
+#define INTR_IFSET      0x0010        /* intr if condition bit is 1 */
+#define INTR_IFCLR      0x0020        /* intr if condition bit is 0 */
+#define INTR_ALWAYS     0x0030        /* always interrupt */
+
+/* Branch control values in command field */
+
+#define BR_MASK         0x000c
+#define BR_NEVER        0x0000        /* don't branch */
+#define BR_IFSET        0x0004        /* branch if condition bit is 1 */
+#define BR_IFCLR        0x0008        /* branch if condition bit is 0 */
+#define BR_ALWAYS       0x000c        /* always branch */
+
+/* Wait control values in command field */
+
+#define WAIT_MASK       0x0003
+#define WAIT_NEVER      0x0000        /* don't wait */
+#define WAIT_IFSET      0x0001        /* wait if condition bit is 1 */
+#define WAIT_IFCLR      0x0002        /* wait if condition bit is 0 */
+#define WAIT_ALWAYS     0x0003        /* always wait */
+
+typedef struct DBDMA_channel {
+    int channel;
+    uint32_t regs[DBDMA_REGS];
+    qemu_irq irq;
+    DBDMA_io io;
+    DBDMA_rw rw;
+    DBDMA_flush flush;
+    dbdma_cmd current;
+    int processing;
+} DBDMA_channel;
+
+typedef struct {
+    MemoryRegion mem;
+    DBDMA_channel channels[DBDMA_CHANNELS];
+} DBDMAState;
+
+/* Externally callable functions */
 
 void DBDMA_register_channel(void *dbdma, int nchan, qemu_irq irq,
                             DBDMA_rw rw, DBDMA_flush flush,
