target-mips: DMA support for RC4030 chipset

Attached patch implements DMA support to RC4030 chipset and simplifies
jazz IO part (at 0xf0000000), where registers contain 16 bit values.
Config register has not a clear meaning (only one value is always valid,
and sometimes another one), so use a magic value instead.
The patch also wires DMA transfers for the SCSI adapter in the Jazz
emulation (Mips Magnum 4000 and Acer Pica 61).

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6145 c046a42c-6fe2-441c-8c8c-71466251a162

3 files changed, 246 insertions, 92 deletions

diff --git a/hw/mips.h b/hw/mips.h
index 1ebb107dbc..589be9da97 100644
--- a/hw/mips.h
+++ b/hw/mips.h
@@ -27,6 +27,10 @@ extern void cpu_mips_irq_init_cpu(CPUState *env);
 extern void cpu_mips_clock_init(CPUState *);
 
 /* rc4030.c */
-qemu_irq *rc4030_init(qemu_irq timer, qemu_irq jazz_bus);
+typedef struct rc4030DMAState *rc4030_dma;
+typedef void (*rc4030_dma_function)(void *dma, uint8_t *buf, int len);
+qemu_irq *rc4030_init(qemu_irq timer, qemu_irq jazz_bus,
+                      rc4030_dma **dmas,
+                      rc4030_dma_function *dma_read, rc4030_dma_function *dma_write);
 
 #endif
diff --git a/hw/mips_jazz.c b/hw/mips_jazz.c
index 0dcc332c40..dc08deb301 100644
--- a/hw/mips_jazz.c
+++ b/hw/mips_jazz.c
@@ -75,6 +75,24 @@ static CPUWriteMemoryFunc *rtc_write[3] = {
     rtc_writeb,
 };
 
+static void dma_dummy_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+    /* Nothing to do. That is only to ensure that
+     * the current DMA acknowledge cycle is completed. */
+}
+
+static CPUReadMemoryFunc *dma_dummy_read[3] = {
+    NULL,
+    NULL,
+    NULL,
+};
+
+static CPUWriteMemoryFunc *dma_dummy_write[3] = {
+    dma_dummy_writeb,
+    dma_dummy_writeb,
+    dma_dummy_writeb,
+};
+
 #ifdef HAS_AUDIO
 static void audio_init(qemu_irq *pic)
 {
@@ -102,16 +120,6 @@ static void audio_init(qemu_irq *pic)
 }
 #endif
 
-static void espdma_memory_read(void *opaque, uint8_t *buf, int len)
-{
-    printf("espdma_memory_read(buf %p, len %d) not implemented\n", buf, len);
-}
-
-static void espdma_memory_write(void *opaque, uint8_t *buf, int len)
-{
-    printf("espdma_memory_write(buf %p, len %d) not implemented\n", buf, len);
-}
-
 #define MAGNUM_BIOS_SIZE_MAX 0x7e000
 #define MAGNUM_BIOS_SIZE (BIOS_SIZE < MAGNUM_BIOS_SIZE_MAX ? BIOS_SIZE : MAGNUM_BIOS_SIZE_MAX)
 
@@ -125,9 +133,11 @@ void mips_jazz_init (ram_addr_t ram_size, int vga_ram_size,
     int bios_size, n;
     CPUState *env;
     qemu_irq *rc4030, *i8259;
+    rc4030_dma *dmas;
+    rc4030_dma_function dma_read, dma_write;
     void *scsi_hba;
     int hd;
-    int s_rtc;
+    int s_rtc, s_dma_dummy;
     PITState *pit;
     BlockDriverState *fds[MAX_FD];
     qemu_irq esp_reset;
@@ -153,7 +163,9 @@ void mips_jazz_init (ram_addr_t ram_size, int vga_ram_size,
 
     /* load the BIOS image. */
     bios_offset = ram_size + vga_ram_size;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, BIOS_FILENAME);
+    if (bios_name == NULL)
+        bios_name = BIOS_FILENAME;
+    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
     bios_size = load_image(buf, phys_ram_base + bios_offset);
     if (bios_size < 0 || bios_size > MAGNUM_BIOS_SIZE) {
         fprintf(stderr, "qemu: Could not load MIPS bios '%s'\n",
@@ -171,10 +183,14 @@ void mips_jazz_init (ram_addr_t ram_size, int vga_ram_size,
     cpu_mips_clock_init(env);
 
     /* Chipset */
-    rc4030 = rc4030_init(env->irq[6], env->irq[3]);
+    rc4030 = rc4030_init(env->irq[6], env->irq[3],
+                         &dmas, &dma_read, &dma_write);
+    s_dma_dummy = cpu_register_io_memory(0, dma_dummy_read, dma_dummy_write, NULL);
+    cpu_register_physical_memory(0x8000d000, 0x00001000, s_dma_dummy);
 
     /* ISA devices */
     i8259 = i8259_init(env->irq[4]);
+    DMA_init(0);
     pit = pit_init(0x40, i8259[0]);
     pcspk_init(pit);
 
@@ -200,7 +216,7 @@ void mips_jazz_init (ram_addr_t ram_size, int vga_ram_size,
 
     /* SCSI adapter */
     scsi_hba = esp_init(0x80002000, 0,
-                        espdma_memory_read, espdma_memory_write, NULL,
+                        dma_read, dma_write, dmas[0],
                         rc4030[5], &esp_reset);
     for (n = 0; n < ESP_MAX_DEVS; n++) {
         hd = drive_get_index(IF_SCSI, 0, n);
@@ -278,6 +294,7 @@ QEMUMachine mips_magnum_machine = {
     .init = mips_magnum_init,
     .ram_require = MAGNUM_BIOS_SIZE + VGA_RAM_SIZE,
     .nodisk_ok = 1,
+    .use_scsi = 1,
 };
 
 QEMUMachine mips_pica61_machine = {
@@ -286,4 +303,5 @@ QEMUMachine mips_pica61_machine = {
     .init = mips_pica61_init,
     .ram_require = MAGNUM_BIOS_SIZE + VGA_RAM_SIZE,
     .nodisk_ok = 1,
+    .use_scsi = 1,
 };
diff --git a/hw/rc4030.c b/hw/rc4030.c
index 89cec6e3bb..c37c252508 100644
--- a/hw/rc4030.c
+++ b/hw/rc4030.c
@@ -26,13 +26,43 @@
 #include "mips.h"
 #include "qemu-timer.h"
 
+/********************************************************/
+/* debug rc4030 */
+
 //#define DEBUG_RC4030
+//#define DEBUG_RC4030_DMA
 
 #ifdef DEBUG_RC4030
+#define DPRINTF(fmt, args...) \
+do { printf("rc4030: " fmt , ##args); } while (0)
 static const char* irq_names[] = { "parallel", "floppy", "sound", "video",
             "network", "scsi", "keyboard", "mouse", "serial0", "serial1" };
+#else
+#define DPRINTF(fmt, args...)
 #endif
 
+#define RC4030_ERROR(fmt, args...) \
+do { fprintf(stderr, "rc4030 ERROR: %s: " fmt, __func__ , ##args); } while (0)
+
+/********************************************************/
+/* rc4030 emulation                                     */
+
+typedef struct dma_pagetable_entry {
+    int32_t frame;
+    int32_t owner;
+} __attribute__((packed)) dma_pagetable_entry;
+
+#define DMA_PAGESIZE    4096
+#define DMA_REG_ENABLE  1
+#define DMA_REG_COUNT   2
+#define DMA_REG_ADDRESS 3
+
+#define DMA_FLAG_ENABLE     0x0001
+#define DMA_FLAG_MEM_TO_DEV 0x0002
+#define DMA_FLAG_TC_INTR    0x0100
+#define DMA_FLAG_MEM_INTR   0x0200
+#define DMA_FLAG_ADDR_INTR  0x0400
+
 typedef struct rc4030State
 {
     uint32_t config; /* 0x0000: RC4030 config register */
@@ -51,7 +81,6 @@ typedef struct rc4030State
     uint32_t cache_bmask; /* 0x0058: I/O Cache Byte Mask */
     uint32_t cache_bwin; /* 0x0060: I/O Cache Buffer Window */
 
-    uint32_t offset208;
     uint32_t offset210;
     uint32_t nvram_protect; /* 0x0220: NV ram protect register */
     uint32_t offset238;
@@ -63,7 +92,6 @@ typedef struct rc4030State
     QEMUTimer *periodic_timer;
     uint32_t itr; /* Interval timer reload */
 
-    uint32_t dummy32;
     qemu_irq timer_irq;
     qemu_irq jazz_bus_irq;
 } rc4030State;
@@ -165,7 +193,7 @@ static uint32_t rc4030_readl(void *opaque, target_phys_addr_t addr)
     case 0x01d0:
     case 0x01d8:
     case 0x01e0:
-    case 0x1e8:
+    case 0x01e8:
     case 0x01f0:
     case 0x01f8:
         {
@@ -176,7 +204,7 @@ static uint32_t rc4030_readl(void *opaque, target_phys_addr_t addr)
         break;
     /* Offset 0x0208 */
     case 0x0208:
-        val = s->offset208;
+        val = 0;
         break;
     /* Offset 0x0210 */
     case 0x0210:
@@ -188,7 +216,7 @@ static uint32_t rc4030_readl(void *opaque, target_phys_addr_t addr)
         break;
     /* Interval timer count */
     case 0x0230:
-        val = s->dummy32;
+        val = 0;
         qemu_irq_lower(s->timer_irq);
         break;
     /* Offset 0x0238 */
@@ -196,17 +224,13 @@ static uint32_t rc4030_readl(void *opaque, target_phys_addr_t addr)
         val = s->offset238;
         break;
     default:
-#ifdef DEBUG_RC4030
-        printf("rc4030: invalid read [" TARGET_FMT_lx "]\n", addr);
-#endif
+        RC4030_ERROR("invalid read [" TARGET_FMT_plx "]\n", addr);
         val = 0;
         break;
     }
 
-#ifdef DEBUG_RC4030
     if ((addr & ~3) != 0x230)
-        printf("rc4030: read 0x%02x at " TARGET_FMT_lx "\n", val, addr);
-#endif
+        DPRINTF("read 0x%02x at " TARGET_FMT_plx "\n", val, addr);
 
     return val;
 }
@@ -231,9 +255,7 @@ static void rc4030_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
     rc4030State *s = opaque;
     addr &= 0x3fff;
 
-#ifdef DEBUG_RC4030
-    printf("rc4030: write 0x%02x at " TARGET_FMT_lx "\n", val, addr);
-#endif
+    DPRINTF("write 0x%02x at " TARGET_FMT_plx "\n", val, addr);
 
     switch (addr & ~0x3) {
     /* Global config register */
@@ -248,6 +270,13 @@ static void rc4030_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
     case 0x0020:
         s->dma_tl_limit = val;
         break;
+    /* DMA transl. table invalidated */
+    case 0x0028:
+        break;
+    /* Cache Maintenance */
+    case 0x0030:
+        RC4030_ERROR("Cache maintenance not handled yet (val 0x%02x)\n", val);
+        break;
     /* I/O Cache Physical Tag */
     case 0x0048:
         s->cache_ptag = val;
@@ -322,7 +351,7 @@ static void rc4030_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
     case 0x01d0:
     case 0x01d8:
     case 0x01e0:
-    case 0x1e8:
+    case 0x01e8:
     case 0x01f0:
     case 0x01f8:
         {
@@ -342,9 +371,7 @@ static void rc4030_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
         set_next_tick(s);
         break;
     default:
-#ifdef DEBUG_RC4030
-        printf("rc4030: invalid write of 0x%02x at [" TARGET_FMT_lx "]\n", val, addr);
-#endif
+        RC4030_ERROR("invalid write of 0x%02x at [" TARGET_FMT_plx "]\n", val, addr);
         break;
     }
 }
@@ -402,7 +429,7 @@ static void update_jazz_irq(rc4030State *s)
 #ifdef DEBUG_RC4030
     if (s->isr_jazz != 0) {
         uint32_t irq = 0;
-        printf("jazz pending:");
+        DPRINTF("pending irqs:");
         for (irq = 0; irq < ARRAY_SIZE(irq_names); irq++) {
             if (s->isr_jazz & (1 << irq)) {
                 printf(" %s", irq_names[irq]);
@@ -442,7 +469,7 @@ static void rc4030_periodic_timer(void *opaque)
     qemu_irq_raise(s->timer_irq);
 }
 
-static uint32_t int_readb(void *opaque, target_phys_addr_t addr)
+static uint32_t jazzio_readw(void *opaque, target_phys_addr_t addr)
 {
     rc4030State *s = opaque;
     uint32_t val;
@@ -450,14 +477,14 @@ static uint32_t int_readb(void *opaque, target_phys_addr_t addr)
     addr &= 0xfff;
 
     switch (addr) {
+    /* Local bus int source */
     case 0x00: {
-        /* Local bus int source */
         uint32_t pending = s->isr_jazz & s->imr_jazz;
         val = 0;
         irq = 0;
         while (pending) {
             if (pending & 1) {
-                //printf("returning irq %s\n", irq_names[irq]);
+                DPRINTF("returning irq %s\n", irq_names[irq]);
                 val = (irq + 1) << 2;
                 break;
             }
@@ -466,100 +493,93 @@ static uint32_t int_readb(void *opaque, target_phys_addr_t addr)
         }
         break;
     }
+    /* Local bus int enable mask */
+    case 0x02:
+        val = s->imr_jazz;
+        break;
     default:
-#ifdef DEBUG_RC4030
-            printf("rc4030: (interrupt controller) invalid read [" TARGET_FMT_lx "]\n", addr);
-#endif
-            val = 0;
+        RC4030_ERROR("(jazz io controller) invalid read [" TARGET_FMT_plx "]\n", addr);
+        val = 0;
     }
 
-#ifdef DEBUG_RC4030
-    printf("rc4030: (interrupt controller) read 0x%02x at " TARGET_FMT_lx "\n", val, addr);
-#endif
+    DPRINTF("(jazz io controller) read 0x%04x at " TARGET_FMT_plx "\n", val, addr);
 
     return val;
 }
 
-static uint32_t int_readw(void *opaque, target_phys_addr_t addr)
+static uint32_t jazzio_readb(void *opaque, target_phys_addr_t addr)
 {
     uint32_t v;
-    v = int_readb(opaque, addr);
-    v |= int_readb(opaque, addr + 1) << 8;
-    return v;
+    v = jazzio_readw(opaque, addr & ~0x1);
+    return (v >> (8 * (addr & 0x1))) & 0xff;
 }
 
-static uint32_t int_readl(void *opaque, target_phys_addr_t addr)
+static uint32_t jazzio_readl(void *opaque, target_phys_addr_t addr)
 {
     uint32_t v;
-    v = int_readb(opaque, addr);
-    v |= int_readb(opaque, addr + 1) << 8;
-    v |= int_readb(opaque, addr + 2) << 16;
-    v |= int_readb(opaque, addr + 3) << 24;
+    v = jazzio_readw(opaque, addr);
+    v |= jazzio_readw(opaque, addr + 2) << 16;
     return v;
 }
 
-static void int_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
+static void jazzio_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
 {
     rc4030State *s = opaque;
     addr &= 0xfff;
 
-#ifdef DEBUG_RC4030
-    printf("rc4030: (interrupt controller) write 0x%02x at " TARGET_FMT_lx "\n", val, addr);
-#endif
+    DPRINTF("(jazz io controller) write 0x%04x at " TARGET_FMT_plx "\n", val, addr);
 
     switch (addr) {
     /* Local bus int enable mask */
     case 0x02:
-        s->imr_jazz = (s->imr_jazz & 0xff00) | (val << 0); update_jazz_irq(s);
-        break;
-    case 0x03:
-        s->imr_jazz = (s->imr_jazz & 0x00ff) | (val << 8); update_jazz_irq(s);
+        s->imr_jazz = val;
+        update_jazz_irq(s);
         break;
     default:
-#ifdef DEBUG_RC4030
-        printf("rc4030: (interrupt controller) invalid write of 0x%02x at [" TARGET_FMT_lx "]\n", val, addr);
-#endif
+        RC4030_ERROR("(jazz io controller) invalid write of 0x%04x at [" TARGET_FMT_plx "]\n", val, addr);
         break;
     }
 }
 
-static void int_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
+static void jazzio_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
 {
-    int_writeb(opaque, addr, val & 0xff);
-    int_writeb(opaque, addr + 1, (val >> 8) & 0xff);
+    uint32_t old_val = jazzio_readw(opaque, addr & ~0x1);
+
+    switch (addr & 1) {
+    case 0:
+        val = val | (old_val & 0xff00);
+        break;
+    case 1:
+        val = (val << 8) | (old_val & 0x00ff);
+        break;
+    }
+    jazzio_writew(opaque, addr & ~0x1, val);
 }
 
-static void int_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
+static void jazzio_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
 {
-    int_writeb(opaque, addr, val & 0xff);
-    int_writeb(opaque, addr + 1, (val >> 8) & 0xff);
-    int_writeb(opaque, addr + 2, (val >> 16) & 0xff);
-    int_writeb(opaque, addr + 3, (val >> 24) & 0xff);
+    jazzio_writew(opaque, addr, val & 0xffff);
+    jazzio_writew(opaque, addr + 2, (val >> 16) & 0xffff);
 }
 
-static CPUReadMemoryFunc *int_read[3] = {
-    int_readb,
-    int_readw,
-    int_readl,
+static CPUReadMemoryFunc *jazzio_read[3] = {
+    jazzio_readb,
+    jazzio_readw,
+    jazzio_readl,
 };
 
-static CPUWriteMemoryFunc *int_write[3] = {
-    int_writeb,
-    int_writew,
-    int_writel,
+static CPUWriteMemoryFunc *jazzio_write[3] = {
+    jazzio_writeb,
+    jazzio_writew,
+    jazzio_writel,
 };
 
-#define G364_512KB_RAM (0x0)
-#define G364_2MB_RAM   (0x1)
-#define G364_8MB_RAM   (0x2)
-#define G364_32MB_RAM  (0x3)
-
 static void rc4030_reset(void *opaque)
 {
     rc4030State *s = opaque;
     int i;
 
-    s->config = (G364_2MB_RAM << 8) | 0x04;
+    s->config = 0x410; /* some boards seem to accept 0x104 too */
     s->invalid_address_register = 0;
 
     memset(s->dma_regs, 0, sizeof(s->dma_regs));
@@ -569,7 +589,6 @@ static void rc4030_reset(void *opaque)
     s->cache_ptag = s->cache_ltag = 0;
     s->cache_bmask = s->cache_bwin = 0;
 
-    s->offset208 = 0;
     s->offset210 = 0x18186;
     s->nvram_protect = 7;
     s->offset238 = 7;
@@ -578,21 +597,134 @@ static void rc4030_reset(void *opaque)
     s->imr_jazz = s->isr_jazz = 0;
 
     s->itr = 0;
-    s->dummy32 = 0;
 
     qemu_irq_lower(s->timer_irq);
     qemu_irq_lower(s->jazz_bus_irq);
 }
 
-qemu_irq *rc4030_init(qemu_irq timer, qemu_irq jazz_bus)
+static void rc4030_do_dma(void *opaque, int n, uint8_t *buf, int len, int is_write)
+{
+    rc4030State *s = opaque;
+    target_phys_addr_t entry_addr;
+    target_phys_addr_t dma_addr, phys_addr;
+    dma_pagetable_entry entry;
+    int index, dev_to_mem;
+    int ncpy, i;
+
+    s->dma_regs[n][DMA_REG_ENABLE] &= ~(DMA_FLAG_TC_INTR | DMA_FLAG_MEM_INTR | DMA_FLAG_ADDR_INTR);
+
+    /* Check DMA channel consistency */
+    dev_to_mem = (s->dma_regs[n][DMA_REG_ENABLE] & DMA_FLAG_MEM_TO_DEV) ? 0 : 1;
+    if (!(s->dma_regs[n][DMA_REG_ENABLE] & DMA_FLAG_ENABLE) ||
+        (is_write != dev_to_mem)) {
+        s->dma_regs[n][DMA_REG_ENABLE] |= DMA_FLAG_MEM_INTR;
+        return;
+    }
+
+    if (len > s->dma_regs[n][DMA_REG_COUNT])
+        len = s->dma_regs[n][DMA_REG_COUNT];
+
+    dma_addr = s->dma_regs[n][DMA_REG_ADDRESS];
+    i = 0;
+    for (;;) {
+        if (i == len) {
+            s->dma_regs[n][DMA_REG_ENABLE] |= DMA_FLAG_TC_INTR;
+            break;
+        }
+
+        ncpy = DMA_PAGESIZE - (dma_addr & (DMA_PAGESIZE - 1));
+        if (ncpy > len - i)
+            ncpy = len - i;
+
+        /* Get DMA translation table entry */
+        index = dma_addr / DMA_PAGESIZE;
+        if (index >= s->dma_tl_limit / sizeof(dma_pagetable_entry)) {
+            s->dma_regs[n][DMA_REG_ENABLE] |= DMA_FLAG_MEM_INTR;
+            break;
+        }
+        entry_addr = s->dma_tl_base + index * sizeof(dma_pagetable_entry);
+        /* XXX: not sure. should we really use only lowest bits? */
+        entry_addr &= 0x7fffffff;
+        cpu_physical_memory_rw(entry_addr, (uint8_t *)&entry, sizeof(entry), 0);
+
+        /* Read/write data at right place */
+        phys_addr = entry.frame + (dma_addr & (DMA_PAGESIZE - 1));
+        cpu_physical_memory_rw(phys_addr, &buf[i], ncpy, is_write);
+
+        i += ncpy;
+        dma_addr += ncpy;
+        s->dma_regs[n][DMA_REG_COUNT] -= ncpy;
+    }
+
+#ifdef DEBUG_RC4030_DMA
+    {
+        int i, j;
+        printf("rc4030 dma: Copying %d bytes %s host %p\n",
+            len, is_write ? "from" : "to", buf);
+        for (i = 0; i < len; i += 16) {
+            int n = min(16, len - i);
+            for (j = 0; j < n; j++)
+                printf("%02x ", buf[i + j]);
+            while (j++ < 16)
+                printf("   ");
+            printf("| ");
+            for (j = 0; j < n; j++)
+                printf("%c", isprint(buf[i + j]) ? buf[i + j] : '.');
+            printf("\n");
+        }
+    }
+#endif
+}
+
+struct rc4030DMAState {
+    void *opaque;
+    int n;
+};
+
+static void rc4030_dma_read(void *dma, uint8_t *buf, int len)
+{
+    rc4030_dma s = dma;
+    rc4030_do_dma(s->opaque, s->n, buf, len, 0);
+}
+
+static void rc4030_dma_write(void *dma, uint8_t *buf, int len)
+{
+    rc4030_dma s = dma;
+    rc4030_do_dma(s->opaque, s->n, buf, len, 1);
+}
+
+static rc4030_dma *rc4030_allocate_dmas(void *opaque, int n)
+{
+    rc4030_dma *s;
+    struct rc4030DMAState *p;
+    int i;
+
+    s = (rc4030_dma *)qemu_mallocz(sizeof(rc4030_dma) * n);
+    p = (struct rc4030DMAState *)qemu_mallocz(sizeof(struct rc4030DMAState) * n);
+    for (i = 0; i < n; i++) {
+        p->opaque = opaque;
+        p->n = i;
+        s[i] = p;
+        p++;
+    }
+    return s;
+}
+
+qemu_irq *rc4030_init(qemu_irq timer, qemu_irq jazz_bus,
+                      rc4030_dma **dmas,
+                      rc4030_dma_function *dma_read, rc4030_dma_function *dma_write)
 {
     rc4030State *s;
-    int s_chipset, s_int;
+    int s_chipset, s_jazzio;
 
     s = qemu_mallocz(sizeof(rc4030State));
     if (!s)
         return NULL;
 
+    *dmas = rc4030_allocate_dmas(s, 4);
+    *dma_read = rc4030_dma_read;
+    *dma_write = rc4030_dma_write;
+
     s->periodic_timer = qemu_new_timer(vm_clock, rc4030_periodic_timer, s);
     s->timer_irq = timer;
     s->jazz_bus_irq = jazz_bus;
@@ -602,8 +734,8 @@ qemu_irq *rc4030_init(qemu_irq timer, qemu_irq jazz_bus)
 
     s_chipset = cpu_register_io_memory(0, rc4030_read, rc4030_write, s);
     cpu_register_physical_memory(0x80000000, 0x300, s_chipset);
-    s_int = cpu_register_io_memory(0, int_read, int_write, s);
-    cpu_register_physical_memory(0xf0000000, 0x00001000, s_int);
+    s_jazzio = cpu_register_io_memory(0, jazzio_read, jazzio_write, s);
+    cpu_register_physical_memory(0xf0000000, 0x00001000, s_jazzio);
 
     return qemu_allocate_irqs(rc4030_irq_jazz_request, s, 16);
 }