SD card emulation (initial implementation by Andrzei Zaborowski).

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2620 c046a42c-6fe2-441c-8c8c-71466251a162

10 files changed, 2084 insertions, 8 deletions

diff --git a/Makefile.target b/Makefile.target
index 2742991..16adfc7 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -442,8 +442,8 @@ endif
 endif
 ifeq ($(TARGET_BASE_ARCH), arm)
 VL_OBJS+= integratorcp.o versatilepb.o ps2.o smc91c111.o arm_pic.o arm_timer.o
-VL_OBJS+= arm_boot.o pl011.o pl050.o pl080.o pl110.o pl190.o
-VL_OBJS+= versatile_pci.o
+VL_OBJS+= arm_boot.o pl011.o pl050.o pl080.o pl110.o pl181.o pl190.o
+VL_OBJS+= versatile_pci.o sd.o
 VL_OBJS+= arm_gic.o realview.o arm_sysctl.o
 VL_OBJS+= arm-semi.o
 endif
diff --git a/hw/integratorcp.c b/hw/integratorcp.c
index 5e4c636..1d8b722 100644
--- a/hw/integratorcp.c
+++ b/hw/integratorcp.c
@@ -1,7 +1,7 @@
 /* 
  * ARM Integrator CP System emulation.
  *
- * Copyright (c) 2005-2006 CodeSourcery.
+ * Copyright (c) 2005-2007 CodeSourcery.
  * Written by Paul Brook
  *
  * This code is licenced under the GPL
@@ -500,6 +500,7 @@ static void integratorcp_init(int ram_size, int vga_ram_size, int boot_device,
     icp_control_init(0xcb000000);
     pl050_init(0x18000000, pic, 3, 0);
     pl050_init(0x19000000, pic, 4, 1);
+    pl181_init(0x1c000000, sd_bdrv, pic, 23, 24);
     if (nd_table[0].vlan) {
         if (nd_table[0].model == NULL
             || strcmp(nd_table[0].model, "smc91c111") == 0) {
diff --git a/hw/pl181.c b/hw/pl181.c
new file mode 100644
index 0000000..7912c28
--- /dev/null
+++ b/hw/pl181.c
@@ -0,0 +1,445 @@
+/* 
+ * Arm PrimeCell PL181 MultiMedia Card Interface
+ *
+ * Copyright (c) 2007 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licenced under the GPL.
+ */
+
+#include "vl.h"
+#include "sd.h"
+
+//#define DEBUG_PL181 1
+
+#ifdef DEBUG_PL181
+#define DPRINTF(fmt, args...) \
+do { printf("pl181: " fmt , ##args); } while (0)
+#else
+#define DPRINTF(fmt, args...) do {} while(0)
+#endif
+
+#define PL181_FIFO_LEN 16
+
+typedef struct {
+    struct sd_state_s *card;
+    uint32_t base;
+    uint32_t clock;
+    uint32_t power;
+    uint32_t cmdarg;
+    uint32_t cmd;
+    uint32_t datatimer;
+    uint32_t datalength;
+    uint32_t respcmd;
+    uint32_t response[4];
+    uint32_t datactrl;
+    uint32_t datacnt;
+    uint32_t status;
+    uint32_t mask[2];
+    uint32_t fifocnt;
+    int fifo_pos;
+    int fifo_len;
+    uint32_t fifo[PL181_FIFO_LEN];
+    void *pic;
+    int irq[2];
+} pl181_state;
+
+#define PL181_CMD_INDEX     0x3f
+#define PL181_CMD_RESPONSE  (1 << 6)
+#define PL181_CMD_LONGRESP  (1 << 7)
+#define PL181_CMD_INTERRUPT (1 << 8)
+#define PL181_CMD_PENDING   (1 << 9)
+#define PL181_CMD_ENABLE    (1 << 10)
+
+#define PL181_DATA_ENABLE             (1 << 0)
+#define PL181_DATA_DIRECTION          (1 << 1)
+#define PL181_DATA_MODE               (1 << 2)
+#define PL181_DATA_DMAENABLE          (1 << 3)
+
+#define PL181_STATUS_CMDCRCFAIL       (1 << 0)
+#define PL181_STATUS_DATACRCFAIL      (1 << 1)
+#define PL181_STATUS_CMDTIMEOUT       (1 << 2)
+#define PL181_STATUS_DATATIMEOUT      (1 << 3)
+#define PL181_STATUS_TXUNDERRUN       (1 << 4)
+#define PL181_STATUS_RXOVERRUN        (1 << 5)
+#define PL181_STATUS_CMDRESPEND       (1 << 6)
+#define PL181_STATUS_CMDSENT          (1 << 7)
+#define PL181_STATUS_DATAEND          (1 << 8)
+#define PL181_STATUS_DATABLOCKEND     (1 << 10)
+#define PL181_STATUS_CMDACTIVE        (1 << 11)
+#define PL181_STATUS_TXACTIVE         (1 << 12)
+#define PL181_STATUS_RXACTIVE         (1 << 13)
+#define PL181_STATUS_TXFIFOHALFEMPTY  (1 << 14)
+#define PL181_STATUS_RXFIFOHALFFULL   (1 << 15)
+#define PL181_STATUS_TXFIFOFULL       (1 << 16)
+#define PL181_STATUS_RXFIFOFULL       (1 << 17)
+#define PL181_STATUS_TXFIFOEMPTY      (1 << 18)
+#define PL181_STATUS_RXFIFOEMPTY      (1 << 19)
+#define PL181_STATUS_TXDATAAVLBL      (1 << 20)
+#define PL181_STATUS_RXDATAAVLBL      (1 << 21)
+
+#define PL181_STATUS_TX_FIFO (PL181_STATUS_TXACTIVE \
+                             |PL181_STATUS_TXFIFOHALFEMPTY \
+                             |PL181_STATUS_TXFIFOFULL \
+                             |PL181_STATUS_TXFIFOEMPTY \
+                             |PL181_STATUS_TXDATAAVLBL)
+#define PL181_STATUS_RX_FIFO (PL181_STATUS_RXACTIVE \
+                             |PL181_STATUS_RXFIFOHALFFULL \
+                             |PL181_STATUS_RXFIFOFULL \
+                             |PL181_STATUS_RXFIFOEMPTY \
+                             |PL181_STATUS_RXDATAAVLBL)
+
+static const unsigned char pl181_id[] =
+{ 0x81, 0x11, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
+
+static void pl181_update(pl181_state *s)
+{
+    int i;
+    for (i = 0; i < 2; i++) {
+        pic_set_irq_new(s->pic, s->irq[i], (s->status & s->mask[i]) != 0);
+    }
+}
+
+static void pl181_fifo_push(pl181_state *s, uint32_t value)
+{
+    int n;
+
+    if (s->fifo_len == PL181_FIFO_LEN) {
+        fprintf(stderr, "pl181: FIFO overflow\n");
+        return;
+    }
+    n = (s->fifo_pos + s->fifo_len) & (PL181_FIFO_LEN - 1);
+    s->fifo_len++;
+    s->fifo[n] = value;
+    DPRINTF("FIFO push %08x\n", (int)value);
+}
+
+static uint32_t pl181_fifo_pop(pl181_state *s)
+{
+    uint32_t value;
+
+    if (s->fifo_len == 0) {
+        fprintf(stderr, "pl181: FIFO underflow\n");
+        return 0;
+    }
+    value = s->fifo[s->fifo_pos];
+    s->fifo_len--;
+    s->fifo_pos = (s->fifo_pos + 1) & (PL181_FIFO_LEN - 1);
+    DPRINTF("FIFO pop %08x\n", (int)value);
+    return value;
+}
+
+static void pl181_send_command(pl181_state *s)
+{
+    struct sd_request_s request;
+    uint8_t response[16];
+    int rlen;
+
+    request.cmd = s->cmd & PL181_CMD_INDEX;
+    request.arg = s->cmdarg;
+    DPRINTF("Command %d %08x\n", request.cmd, request.arg);
+    rlen = sd_do_command(s->card, &request, response);
+    if (rlen < 0)
+        goto error;
+    if (s->cmd & PL181_CMD_RESPONSE) {
+#define RWORD(n) ((response[n] << 24) | (response[n + 1] << 16) \
+                  | (response[n + 2] << 8) | response[n + 3])
+        if (rlen == 0 || (rlen == 4 && (s->cmd & PL181_CMD_LONGRESP)))
+            goto error;
+        if (rlen != 4 && rlen != 16)
+            goto error;
+        s->response[0] = RWORD(0);
+        if (rlen == 4) {
+            s->response[1] = s->response[2] = s->response[3] = 0;
+        } else {
+            s->response[1] = RWORD(4);
+            s->response[2] = RWORD(8);
+            s->response[3] = RWORD(12) & ~1;
+        }
+        DPRINTF("Response recieved\n");
+        s->status |= PL181_STATUS_CMDRESPEND;
+#undef RWORD
+    } else {
+        DPRINTF("Command sent\n");
+        s->status |= PL181_STATUS_CMDSENT;
+    }
+    return;
+
+error:
+    DPRINTF("Timeout\n");
+    s->status |= PL181_STATUS_CMDTIMEOUT;
+}
+
+/* Transfer data between teh card and the FIFO.  This is complicated by
+   the FIFO holding 32-bit words and the card taking data in single byte
+   chunks.  FIFO bytes are transferred in little-endian order.  */
+   
+static void pl181_fifo_run(pl181_state *s)
+{
+    uint32_t bits;
+    uint32_t value;
+    int n;
+    int limit;
+    int is_read;
+
+    is_read = (s->datactrl & PL181_DATA_DIRECTION) != 0;
+    if (s->datacnt != 0 && (!is_read || sd_data_ready(s->card))) {
+        limit = is_read ? PL181_FIFO_LEN : 0;
+        n = 0;
+        value = 0;
+        while (s->datacnt && s->fifo_len != limit) {
+            if (is_read) {
+                value |= (uint32_t)sd_read_data(s->card) << (n * 8);
+                n++;
+                if (n == 4) {
+                    pl181_fifo_push(s, value);
+                    value = 0;
+                    n = 0;
+                }
+            } else {
+                if (n == 0) {
+                    value = pl181_fifo_pop(s);
+                    n = 4;
+                }
+                sd_write_data(s->card, value & 0xff);
+                value >>= 8;
+                n--;
+            }
+            s->datacnt--;
+        }
+        if (n && is_read) {
+            pl181_fifo_push(s, value);
+        }
+    }
+    s->status &= ~(PL181_STATUS_RX_FIFO | PL181_STATUS_TX_FIFO);
+    if (s->datacnt == 0) {
+        s->status |= PL181_STATUS_DATAEND;
+        /* HACK: */
+        s->status |= PL181_STATUS_DATABLOCKEND;
+        DPRINTF("Transfer Complete\n");
+    }
+    if (s->datacnt == 0 && s->fifocnt == 0) {
+        s->datactrl &= ~PL181_DATA_ENABLE;
+        DPRINTF("Data engine idle\n");
+    } else {
+        /* Update FIFO bits.  */
+        bits = PL181_STATUS_TXACTIVE | PL181_STATUS_RXACTIVE;
+        if (s->fifo_len == 0) {
+            bits |= PL181_STATUS_TXFIFOEMPTY;
+            bits |= PL181_STATUS_RXFIFOEMPTY;
+        } else {
+            bits |= PL181_STATUS_TXDATAAVLBL;
+            bits |= PL181_STATUS_RXDATAAVLBL;
+        }
+        if (s->fifo_len == 16) {
+            bits |= PL181_STATUS_TXFIFOFULL;
+            bits |= PL181_STATUS_RXFIFOFULL;
+        }
+        if (s->fifo_len <= 8) {
+            bits |= PL181_STATUS_TXFIFOHALFEMPTY;
+        }
+        if (s->fifo_len >= 8) {
+            bits |= PL181_STATUS_RXFIFOHALFFULL;
+        }
+        if (s->datactrl & PL181_DATA_DIRECTION) {
+            bits &= PL181_STATUS_RX_FIFO;
+        } else {
+            bits &= PL181_STATUS_TX_FIFO;
+        }
+        s->status |= bits;
+    }
+}
+
+static uint32_t pl181_read(void *opaque, target_phys_addr_t offset)
+{
+    pl181_state *s = (pl181_state *)opaque;
+
+    offset -= s->base;
+    if (offset >= 0xfe0 && offset < 0x1000) {
+        return pl181_id[(offset - 0xfe0) >> 2];
+    }
+    switch (offset) {
+    case 0x00: /* Power */
+        return s->power;
+    case 0x04: /* Clock */
+        return s->clock;
+    case 0x08: /* Argument */
+        return s->cmdarg;
+    case 0x0c: /* Command */
+        return s->cmd;
+    case 0x10: /* RespCmd */
+        return s->respcmd;
+    case 0x14: /* Response0 */
+        return s->response[0];
+    case 0x18: /* Response1 */
+        return s->response[1];
+    case 0x1c: /* Response2 */
+        return s->response[2];
+    case 0x20: /* Response3 */
+        return s->response[3];
+    case 0x24: /* DataTimer */
+        return s->datatimer;
+    case 0x28: /* DataLength */
+        return s->datalength;
+    case 0x2c: /* DataCtrl */
+        return s->datactrl;
+    case 0x30: /* DataCnt */
+        return s->datacnt;
+    case 0x34: /* Status */
+        return s->status;
+    case 0x3c: /* Mask0 */
+        return s->mask[0];
+    case 0x40: /* Mask1 */
+        return s->mask[1];
+    case 0x48: /* FifoCnt */
+        return s->fifocnt;
+    case 0x80: case 0x84: case 0x88: case 0x8c: /* FifoData */
+    case 0x90: case 0x94: case 0x98: case 0x9c:
+    case 0xa0: case 0xa4: case 0xa8: case 0xac:
+    case 0xb0: case 0xb4: case 0xb8: case 0xbc:
+        if (s->fifocnt == 0) {
+            fprintf(stderr, "pl181: Unexpected FIFO read\n");
+            return 0;
+        } else {
+            uint32_t value;
+            s->fifocnt--;
+            value = pl181_fifo_pop(s);
+            pl181_fifo_run(s);
+            pl181_update(s);
+            return value;
+        }
+    default:
+        cpu_abort (cpu_single_env, "pl181_read: Bad offset %x\n", offset);
+        return 0;
+    }
+}
+
+static void pl181_write(void *opaque, target_phys_addr_t offset,
+                          uint32_t value)
+{
+    pl181_state *s = (pl181_state *)opaque;
+
+    offset -= s->base;
+    switch (offset) {
+    case 0x00: /* Power */
+        s->power = value & 0xff;
+        break;
+    case 0x04: /* Clock */
+        s->clock = value & 0xff;
+        break;
+    case 0x08: /* Argument */
+        s->cmdarg = value;
+        break;
+    case 0x0c: /* Command */
+        s->cmd = value;
+        if (s->cmd & PL181_CMD_ENABLE) {
+            if (s->cmd & PL181_CMD_INTERRUPT) {
+                fprintf(stderr, "pl181: Interrupt mode not implemented\n");
+                abort();
+            } if (s->cmd & PL181_CMD_PENDING) {
+                fprintf(stderr, "pl181: Pending commands not implemented\n");
+                abort();
+            } else {
+                pl181_send_command(s);
+                pl181_fifo_run(s);
+            }
+            /* The command has completed one way or the other.  */
+            s->cmd &= ~PL181_CMD_ENABLE;
+        }
+        break;
+    case 0x24: /* DataTimer */
+        s->datatimer = value;
+        break;
+    case 0x28: /* DataLength */
+        s->datalength = value & 0xffff;
+        break;
+    case 0x2c: /* DataCtrl */
+        s->datactrl = value & 0xff;
+        if (value & PL181_DATA_ENABLE) {
+            s->datacnt = s->datalength;
+            s->fifocnt = (s->datalength + 3) >> 2;
+            pl181_fifo_run(s);
+        }
+        break;
+    case 0x38: /* Clear */
+        s->status &= ~(value & 0x7ff);
+        break;
+    case 0x3c: /* Mask0 */
+        s->mask[0] = value;
+        break;
+    case 0x40: /* Mask1 */
+        s->mask[1] = value;
+        break;
+    case 0x80: case 0x84: case 0x88: case 0x8c: /* FifoData */
+    case 0x90: case 0x94: case 0x98: case 0x9c:
+    case 0xa0: case 0xa4: case 0xa8: case 0xac:
+    case 0xb0: case 0xb4: case 0xb8: case 0xbc:
+        if (s->fifocnt == 0) {
+            fprintf(stderr, "pl181: Unexpected FIFO write\n");
+        } else {
+            s->fifocnt--;
+            pl181_fifo_push(s, value);
+            pl181_fifo_run(s);
+        }
+        break;
+    default:
+        cpu_abort (cpu_single_env, "pl181_write: Bad offset %x\n", offset);
+    }
+    pl181_update(s);
+}
+
+static CPUReadMemoryFunc *pl181_readfn[] = {
+   pl181_read,
+   pl181_read,
+   pl181_read
+};
+
+static CPUWriteMemoryFunc *pl181_writefn[] = {
+   pl181_write,
+   pl181_write,
+   pl181_write
+};
+
+static void pl181_reset(void *opaque)
+{
+    pl181_state *s = (pl181_state *)opaque;
+
+    s->power = 0;
+    s->cmdarg = 0;
+    s->cmd = 0;
+    s->datatimer = 0;
+    s->datalength = 0;
+    s->respcmd = 0;
+    s->response[0] = 0;
+    s->response[1] = 0;
+    s->response[2] = 0;
+    s->response[3] = 0;
+    s->datatimer = 0;
+    s->datalength = 0;
+    s->datactrl = 0;
+    s->datacnt = 0;
+    s->status = 0;
+    s->mask[0] = 0;
+    s->mask[1] = 0;
+    s->fifocnt = 0;
+}
+
+void pl181_init(uint32_t base, BlockDriverState *bd,
+                void *pic, int irq0, int irq1)
+{
+    int iomemtype;
+    pl181_state *s;
+
+    s = (pl181_state *)qemu_mallocz(sizeof(pl181_state));
+    iomemtype = cpu_register_io_memory(0, pl181_readfn,
+                                       pl181_writefn, s);
+    cpu_register_physical_memory(base, 0x00000fff, iomemtype);
+    s->base = base;
+    s->card = sd_init(bd);
+    s->pic = pic;
+    s->irq[0] = irq0;
+    s->irq[1] = irq1;
+    qemu_register_reset(pl181_reset, s);
+    pl181_reset(s);
+    /* ??? Save/restore.  */
+}
diff --git a/hw/realview.c b/hw/realview.c
index a5607e7..1d351bf 100644
--- a/hw/realview.c
+++ b/hw/realview.c
@@ -1,7 +1,7 @@
 /* 
  * ARM RealView Baseboard System emulation.
  *
- * Copyright (c) 2006 CodeSourcery.
+ * Copyright (c) 2006-2007 CodeSourcery.
  * Written by Paul Brook
  *
  * This code is licenced under the GPL.
@@ -55,6 +55,8 @@ static void realview_init(int ram_size, int vga_ram_size, int boot_device,
 
     pl110_init(ds, 0x10020000, pic, 23, 1);
 
+    pl181_init(0x10005000, sd_bdrv, pic, 17, 18);
+
     pci_bus = pci_vpb_init(pic, 48, 1);
     if (usb_enabled) {
         usb_ohci_init_pci(pci_bus, 3, -1);
diff --git a/hw/sd.c b/hw/sd.c
new file mode 100644
index 0000000..799c945
--- /dev/null
+++ b/hw/sd.c
@@ -0,0 +1,1508 @@
+/* 
+ * SD Memory Card emulation as defined in the "SD Memory Card Physical
+ * layer specification, Version 1.10."
+ *
+ * Copyright (c) 2006 Andrzej Zaborowski  <balrog@zabor.org>
+ * Copyright (c) 2007 CodeSourcery
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "sd.h"
+
+//#define DEBUG_SD 1
+
+#ifdef DEBUG_SD
+#define DPRINTF(fmt, args...) \
+do { printf("SD: " fmt , ##args); } while (0)
+#else
+#define DPRINTF(fmt, args...) do {} while(0)
+#endif
+
+typedef enum {
+    sd_r0 = 0,    /* no response */
+    sd_r1,        /* normal response command */
+    sd_r2_i,      /* CID register */
+    sd_r2_s,      /* CSD register */
+    sd_r3,        /* OCR register */
+    sd_r6 = 6,    /* Published RCA response */
+    sd_r1b = -1,
+} sd_rsp_type_t;
+
+struct SDState {
+    enum {
+        sd_inactive,
+        sd_card_identification_mode,
+        sd_data_transfer_mode,
+    } mode;
+    enum {
+        sd_inactive_state = -1,
+        sd_idle_state = 0,
+        sd_ready_state,
+        sd_identification_state,
+        sd_standby_state,
+        sd_transfer_state,
+        sd_sendingdata_state,
+        sd_receivingdata_state,
+        sd_programming_state,
+        sd_disconnect_state,
+    } state;
+    uint32_t ocr;
+    uint8_t scr[8];
+    uint8_t cid[16];
+    uint8_t csd[16];
+    uint16_t rca;
+    uint32_t card_status;
+    uint8_t sd_status[64];
+    int wp_switch;
+    int *wp_groups;
+    uint32_t size;
+    int blk_len;
+    uint32_t erase_start;
+    uint32_t erase_end;
+    uint8_t pwd[16];
+    int pwd_len;
+    int function_group[6];
+
+    int current_cmd;
+    int blk_written;
+    uint32_t data_start;
+    uint32_t data_offset;
+    uint8_t data[512];
+    void (*readonly_cb)(void *, int);
+    void (*inserted_cb)(void *, int);
+    void *opaque;
+    BlockDriverState *bdrv;
+};
+
+static void sd_set_status(SDState *sd)
+{
+    switch (sd->state) {
+    case sd_inactive_state:
+        sd->mode = sd_inactive;
+        break;
+
+    case sd_idle_state:
+    case sd_ready_state:
+    case sd_identification_state:
+        sd->mode = sd_card_identification_mode;
+        break;
+
+    case sd_standby_state:
+    case sd_transfer_state:
+    case sd_sendingdata_state:
+    case sd_receivingdata_state:
+    case sd_programming_state:
+    case sd_disconnect_state:
+        sd->mode = sd_data_transfer_mode;
+        break;
+    }
+
+    sd->card_status &= ~CURRENT_STATE;
+    sd->card_status |= sd->state << 9;
+}
+
+const sd_cmd_type_t sd_cmd_type[64] = {
+    sd_bc,   sd_none, sd_bcr,  sd_bcr,  sd_none, sd_none, sd_none, sd_ac,
+    sd_none, sd_ac,   sd_ac,   sd_adtc, sd_ac,   sd_ac,   sd_none, sd_ac,
+    sd_ac,   sd_adtc, sd_adtc, sd_none, sd_none, sd_none, sd_none, sd_none,
+    sd_adtc, sd_adtc, sd_adtc, sd_adtc, sd_ac,   sd_ac,   sd_adtc, sd_none,
+    sd_ac,   sd_ac,   sd_none, sd_none, sd_none, sd_none, sd_ac,   sd_none,
+    sd_none, sd_none, sd_bc,   sd_none, sd_none, sd_none, sd_none, sd_none,
+    sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_ac,
+    sd_adtc, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none,
+};
+
+const sd_cmd_type_t sd_acmd_type[64] = {
+    sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_ac,   sd_none,
+    sd_none, sd_none, sd_none, sd_none, sd_none, sd_adtc, sd_none, sd_none,
+    sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_adtc, sd_ac,
+    sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none,
+    sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none,
+    sd_none, sd_bcr,  sd_ac,   sd_none, sd_none, sd_none, sd_none, sd_none,
+    sd_none, sd_none, sd_none, sd_adtc, sd_none, sd_none, sd_none, sd_none,
+    sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none,
+};
+
+static const int sd_cmd_class[64] = {
+    0,  0,  0,  0,  0,  9, 10,  0,  0,  0,  0,  1,  0,  0,  0,  0,
+    2,  2,  2,  2,  3,  3,  3,  3,  4,  4,  4,  4,  6,  6,  6,  6,
+    5,  5, 10, 10, 10, 10,  5,  9,  9,  9,  7,  7,  7,  7,  7,  7,
+    7,  7, 10,  7,  9,  9,  9,  8,  8, 10,  8,  8,  8,  8,  8,  8,
+};
+
+static uint8_t sd_crc7(void *message, size_t width)
+{
+    int i, bit;
+    uint8_t shift_reg = 0x00;
+    uint8_t *msg = (uint8_t *) message;
+
+    for (i = 0; i < width; i ++, msg ++)
+        for (bit = 7; bit >= 0; bit --) {
+            shift_reg <<= 1;
+            if ((shift_reg >> 7) ^ ((*msg >> bit) & 1))
+                shift_reg ^= 0x89;
+        }
+
+    return shift_reg;
+}
+
+static uint16_t sd_crc16(void *message, size_t width)
+{
+    int i, bit;
+    uint16_t shift_reg = 0x0000;
+    uint16_t *msg = (uint16_t *) message;
+    width <<= 1;
+
+    for (i = 0; i < width; i ++, msg ++)
+        for (bit = 15; bit >= 0; bit --) {
+            shift_reg <<= 1;
+            if ((shift_reg >> 15) ^ ((*msg >> bit) & 1))
+                shift_reg ^= 0x1011;
+        }
+
+    return shift_reg;
+}
+
+static void sd_set_ocr(SDState *sd)
+{
+    sd->ocr = 0x80fffff0;
+}
+
+static void sd_set_scr(SDState *sd)
+{
+    sd->scr[0] = 0x00;		/* SCR Structure */
+    sd->scr[1] = 0x2f;		/* SD Security Support */
+    sd->scr[2] = 0x00;
+    sd->scr[3] = 0x00;
+    sd->scr[4] = 0x00;
+    sd->scr[5] = 0x00;
+    sd->scr[6] = 0x00;
+    sd->scr[7] = 0x00;
+}
+
+#define MID	0xaa
+#define OID	"XY"
+#define PNM	"QEMU!"
+#define PRV	0x01
+#define MDT_YR	2006
+#define MDT_MON	2
+
+static void sd_set_cid(SDState *sd)
+{
+    sd->cid[0] = MID;		/* Fake card manufacturer ID (MID) */
+    sd->cid[1] = OID[0];	/* OEM/Application ID (OID) */
+    sd->cid[2] = OID[1];
+    sd->cid[3] = PNM[0];	/* Fake product name (PNM) */
+    sd->cid[4] = PNM[1];
+    sd->cid[5] = PNM[2];
+    sd->cid[6] = PNM[3];
+    sd->cid[7] = PNM[4];
+    sd->cid[8] = PRV;		/* Fake product revision (PRV) */
+    sd->cid[9] = 0xde;		/* Fake serial number (PSN) */
+    sd->cid[10] = 0xad;
+    sd->cid[11] = 0xbe;
+    sd->cid[12] = 0xef;
+    sd->cid[13] = 0x00 |	/* Manufacture date (MDT) */
+        ((MDT_YR - 2000) / 10);
+    sd->cid[14] = ((MDT_YR % 10) << 4) | MDT_MON;
+    sd->cid[15] = (sd_crc7(sd->cid, 15) << 1) | 1;
+}
+
+#define HWBLOCK_SHIFT	9			/* 512 bytes */
+#define SECTOR_SHIFT	5			/* 16 kilobytes */
+#define WPGROUP_SHIFT	7			/* 2 megs */
+#define CMULT_SHIFT	9			/* 512 times HWBLOCK_SIZE */
+#define BLOCK_SIZE	(1 << (HWBLOCK_SHIFT))
+#define SECTOR_SIZE	(1 << (HWBLOCK_SHIFT + SECTOR_SHIFT))
+#define WPGROUP_SIZE	(1 << (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT))
+
+static const uint8_t sd_csd_rw_mask[16] = {
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xfe,
+};
+
+static void sd_set_csd(SDState *sd, uint32_t size)
+{
+    uint32_t csize = (size >> (CMULT_SHIFT + HWBLOCK_SHIFT)) - 1;
+    uint32_t sectsize = (1 << (SECTOR_SHIFT + 1)) - 1;
+    uint32_t wpsize = (1 << (WPGROUP_SHIFT + 1)) - 1;
+
+    sd->csd[0] = 0x00;		/* CSD structure */
+    sd->csd[1] = 0x26;		/* Data read access-time-1 */
+    sd->csd[2] = 0x00;		/* Data read access-time-2 */
+    sd->csd[3] = 0x5a;		/* Max. data transfer rate */
+    sd->csd[4] = 0x5f;		/* Card Command Classes */
+    sd->csd[5] = 0x50 |		/* Max. read data block length */
+        HWBLOCK_SHIFT;
+    sd->csd[6] = 0xe0 |		/* Partial block for read allowed */
+        ((csize >> 10) & 0x03);
+    sd->csd[7] = 0x00 |		/* Device size */
+        ((csize >> 2) & 0xff);
+    sd->csd[8] = 0x3f |		/* Max. read current */
+        ((csize << 6) & 0xc0);
+    sd->csd[9] = 0xfc |		/* Max. write current */
+        ((CMULT_SHIFT - 2) >> 1);
+    sd->csd[10] = 0x40 |	/* Erase sector size */
+        (((CMULT_SHIFT - 2) << 7) & 0x80) | (sectsize >> 1);
+    sd->csd[11] = 0x00 |	/* Write protect group size */
+        ((sectsize << 7) & 0x80) | wpsize;
+    sd->csd[12] = 0x90 |	/* Write speed factor */
+        (HWBLOCK_SHIFT >> 2);
+    sd->csd[13] = 0x20 |	/* Max. write data block length */
+        ((HWBLOCK_SHIFT << 6) & 0xc0);
+    sd->csd[14] = 0x00;		/* File format group */
+    sd->csd[15] = (sd_crc7(sd->csd, 15) << 1) | 1;
+}
+
+static void sd_set_rca(SDState *sd)
+{
+    sd->rca += 0x4567;
+}
+
+#define CARD_STATUS_A	0x02004100
+#define CARD_STATUS_B	0x00c01e00
+#define CARD_STATUS_C	0xfd39a028
+
+static void sd_set_cardstatus(SDState *sd)
+{
+    sd->card_status = 0x00000100;
+}
+
+static void sd_set_sdstatus(SDState *sd)
+{
+    memset(sd->sd_status, 0, 64);
+}
+
+static int sd_req_crc_validate(struct sd_request_s *req)
+{
+    uint8_t buffer[5];
+    buffer[0] = 0x40 | req->cmd;
+    buffer[1] = (req->arg >> 24) & 0xff;
+    buffer[2] = (req->arg >> 16) & 0xff;
+    buffer[3] = (req->arg >> 8) & 0xff;
+    buffer[4] = (req->arg >> 0) & 0xff;
+    return 0;
+    return sd_crc7(buffer, 5) != req->crc;	/* TODO */
+}
+
+void sd_response_r1_make(SDState *sd,
+                         uint8_t *response, uint32_t last_status)
+{
+    uint32_t mask = CARD_STATUS_B ^ ILLEGAL_COMMAND;
+    uint32_t status;
+
+    status = (sd->card_status & ~mask) | (last_status & mask);
+    sd->card_status &= ~CARD_STATUS_C | APP_CMD;
+
+    response[0] = (status >> 24) & 0xff;
+    response[1] = (status >> 16) & 0xff;
+    response[2] = (status >> 8) & 0xff;
+    response[3] = (status >> 0) & 0xff;
+}
+
+void sd_response_r3_make(SDState *sd, uint8_t *response)
+{
+    response[0] = (sd->ocr >> 24) & 0xff;
+    response[1] = (sd->ocr >> 16) & 0xff;
+    response[2] = (sd->ocr >> 8) & 0xff;
+    response[3] = (sd->ocr >> 0) & 0xff;
+}
+
+void sd_response_r6_make(SDState *sd, uint8_t *response)
+{
+    uint16_t arg;
+    uint16_t status;
+
+    arg = sd->rca;
+    status = ((sd->card_status >> 8) & 0xc000) |
+             ((sd->card_status >> 6) & 0x2000) |
+              (sd->card_status & 0x1fff);
+
+    response[0] = (arg >> 8) & 0xff;
+    response[1] = arg & 0xff;
+    response[2] = (status >> 8) & 0xff;
+    response[3] = status & 0xff;
+}
+
+static void sd_reset(SDState *sd, BlockDriverState *bdrv)
+{
+    uint32_t size;
+    uint64_t sect;
+
+    bdrv_get_geometry(bdrv, &sect);
+    sect <<= 9;
+
+    if (sect > 0x40000000)
+        size = 0x40000000;	/* 1 gig */
+    else
+        size = sect + 1;
+
+    sect = (size >> (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT)) + 1;
+
+    sd->state = sd_idle_state;
+    sd->rca = 0x0000;
+    sd_set_ocr(sd);
+    sd_set_scr(sd);
+    sd_set_cid(sd);
+    sd_set_csd(sd, size);
+    sd_set_cardstatus(sd);
+    sd_set_sdstatus(sd);
+
+    sd->bdrv = bdrv;
+
+    sd->wp_switch = bdrv_is_read_only(bdrv);
+    sd->wp_groups = (int *) qemu_mallocz(sizeof(int) * sect);
+    memset(sd->wp_groups, 0, sizeof(int) * sect);
+    memset(sd->function_group, 0, sizeof(int) * 6);
+    sd->erase_start = 0;
+    sd->erase_end = 0;
+    sd->size = size;
+    sd->blk_len = 0x200;
+    sd->pwd_len = 0;
+}
+
+static void sd_cardchange(void *opaque)
+{
+    SDState *sd = opaque;
+    if (sd->inserted_cb)
+        sd->inserted_cb(sd->opaque, bdrv_is_inserted(sd->bdrv));
+    if (bdrv_is_inserted(sd->bdrv)) {
+        sd_reset(sd, sd->bdrv);
+        if (sd->readonly_cb)
+            sd->readonly_cb(sd->opaque, sd->wp_switch);
+    }
+}
+
+SDState *sd_init(BlockDriverState *bs)
+{
+    SDState *sd;
+
+    sd = (SDState *) qemu_mallocz(sizeof(SDState));
+    sd_reset(sd, bs);
+    return sd;
+}
+
+void sd_set_cb(SDState *sd, void *opaque,
+                void (*readonly_cb)(void *, int),
+                void (*inserted_cb)(void *, int))
+{
+    sd->opaque = opaque;
+    sd->readonly_cb = readonly_cb;
+    sd->inserted_cb = inserted_cb;
+    if (sd->readonly_cb)
+        sd->readonly_cb(sd->opaque, bdrv_is_read_only(sd->bdrv));
+    if (sd->inserted_cb)
+        sd->inserted_cb(sd->opaque, bdrv_is_inserted(sd->bdrv));
+    bdrv_set_change_cb(sd->bdrv, sd_cardchange, sd);
+}
+
+static void sd_erase(SDState *sd)
+{
+    int i, start, end;
+    if (!sd->erase_start || !sd->erase_end) {
+        sd->card_status |= ERASE_SEQ_ERROR;
+        return;
+    }
+
+    start = sd->erase_start >>
+            (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT);
+    end = sd->erase_end >>
+            (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT);
+    sd->erase_start = 0;
+    sd->erase_end = 0;
+    sd->csd[14] |= 0x40;
+
+    for (i = start; i <= end; i ++)
+        if (sd->wp_groups[i])
+            sd->card_status |= WP_ERASE_SKIP;
+}
+
+static uint32_t sd_wpbits(SDState *sd, uint32_t addr)
+{
+    uint32_t i, wpnum;
+    uint32_t ret = 0;
+
+    wpnum = addr >> (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT);
+
+    for (i = 0; i < 32; i ++, wpnum ++, addr += WPGROUP_SIZE)
+        if (addr < sd->size && sd->wp_groups[wpnum])
+            ret |= (1 << i);
+
+    return ret;
+}
+
+static void sd_function_switch(SDState *sd, uint32_t arg)
+{
+    int i, mode, new_func, crc;
+    mode = !!(arg & 0x80000000);
+
+    sd->data[0] = 0x00;		/* Maximum current consumption */
+    sd->data[1] = 0x01;
+    sd->data[2] = 0x80;		/* Supported group 6 functions */
+    sd->data[3] = 0x01;
+    sd->data[4] = 0x80;		/* Supported group 5 functions */
+    sd->data[5] = 0x01;
+    sd->data[6] = 0x80;		/* Supported group 4 functions */
+    sd->data[7] = 0x01;
+    sd->data[8] = 0x80;		/* Supported group 3 functions */
+    sd->data[9] = 0x01;
+    sd->data[10] = 0x80;	/* Supported group 2 functions */
+    sd->data[11] = 0x43;
+    sd->data[12] = 0x80;	/* Supported group 1 functions */
+    sd->data[13] = 0x03;
+    for (i = 0; i < 6; i ++) {
+        new_func = (arg >> (i * 4)) & 0x0f;
+        if (mode && new_func != 0x0f)
+            sd->function_group[i] = new_func;
+        sd->data[14 + (i >> 1)] = new_func << ((i * 4) & 4);
+    }
+    memset(&sd->data[17], 0, 47);
+    crc = sd_crc16(sd->data, 64);
+    sd->data[65] = crc >> 8;
+    sd->data[66] = crc & 0xff;
+}
+
+static inline int sd_wp_addr(SDState *sd, uint32_t addr)
+{
+    return sd->wp_groups[addr >>
+            (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT)];
+}
+
+static void sd_lock_command(SDState *sd)
+{
+    int erase, lock, clr_pwd, set_pwd, pwd_len;
+    erase = !!(sd->data[0] & 0x08);
+    lock = sd->data[0] & 0x04;
+    clr_pwd = sd->data[0] & 0x02;
+    set_pwd = sd->data[0] & 0x01;
+
+    if (sd->blk_len > 1)
+        pwd_len = sd->data[1];
+    else
+        pwd_len = 0;
+
+    if (erase) {
+        if (!(sd->card_status & CARD_IS_LOCKED) || sd->blk_len > 1 ||
+                        set_pwd || clr_pwd || lock || sd->wp_switch ||
+                        (sd->csd[14] & 0x20)) {
+            sd->card_status |= LOCK_UNLOCK_FAILED;
+            return;
+        }
+        memset(sd->wp_groups, 0, sizeof(int) * (sd->size >>
+                        (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT)));
+        sd->csd[14] &= ~0x10;
+        sd->card_status &= ~CARD_IS_LOCKED;
+        sd->pwd_len = 0;
+        /* Erasing the entire card here! */
+        printf("SD: Card force-erased by CMD42\n");
+        return;
+    }
+
+    if (sd->blk_len < 2 + pwd_len ||
+                    pwd_len <= sd->pwd_len ||
+                    pwd_len > sd->pwd_len + 16) {
+        sd->card_status |= LOCK_UNLOCK_FAILED;
+        return;
+    }
+
+    if (sd->pwd_len && memcmp(sd->pwd, sd->data + 2, sd->pwd_len)) {
+        sd->card_status |= LOCK_UNLOCK_FAILED;
+        return;
+    }
+
+    pwd_len -= sd->pwd_len;
+    if ((pwd_len && !set_pwd) ||
+                    (clr_pwd && (set_pwd || lock)) ||
+                    (lock && !sd->pwd_len && !set_pwd) ||
+                    (!set_pwd && !clr_pwd &&
+                     (((sd->card_status & CARD_IS_LOCKED) && lock) ||
+                      (!(sd->card_status & CARD_IS_LOCKED) && !lock)))) {
+        sd->card_status |= LOCK_UNLOCK_FAILED;
+        return;
+    }
+
+    if (set_pwd) {
+        memcpy(sd->pwd, sd->data + 2 + sd->pwd_len, pwd_len);
+        sd->pwd_len = pwd_len;
+    }
+
+    if (clr_pwd) {
+        sd->pwd_len = 0;
+    }
+
+    if (lock)
+        sd->card_status |= CARD_IS_LOCKED;
+    else
+        sd->card_status &= ~CARD_IS_LOCKED;
+}
+
+static sd_rsp_type_t sd_normal_command(SDState *sd,
+                                       struct sd_request_s req)
+{
+    uint32_t rca = 0x0000;
+
+    if (sd_cmd_type[req.cmd] == sd_ac || sd_cmd_type[req.cmd] == sd_adtc)
+        rca = req.arg >> 16;
+
+    DPRINTF("CMD%d 0x%08x state %d\n", req.cmd, req.arg, sd->state);
+    switch (req.cmd) {
+    /* Basic commands (Class 0 and Class 1) */
+    case 0:	/* CMD0:   GO_IDLE_STATE */
+        switch (sd->state) {
+        case sd_inactive_state:
+            return sd_r0;
+
+        default:
+            sd->state = sd_idle_state;
+            sd_reset(sd, sd->bdrv);
+            return sd_r0;
+        }
+        break;
+
+    case 2:	/* CMD2:   ALL_SEND_CID */
+        switch (sd->state) {
+        case sd_ready_state:
+            sd->state = sd_identification_state;
+            return sd_r2_i;
+
+        default:
+            break;
+        }
+        break;
+
+    case 3:	/* CMD3:   SEND_RELATIVE_ADDR */
+        switch (sd->state) {
+        case sd_identification_state:
+        case sd_standby_state:
+            sd->state = sd_standby_state;
+            sd_set_rca(sd);
+            return sd_r6;
+
+        default:
+            break;
+        }
+        break;
+
+    case 4:	/* CMD4:   SEND_DSR */
+        switch (sd->state) {
+        case sd_standby_state:
+            break;
+
+        default:
+            break;
+        }
+        break;
+
+    case 6:	/* CMD6:   SWITCH_FUNCTION */
+        switch (sd->mode) {
+        case sd_data_transfer_mode:
+            sd_function_switch(sd, req.arg);
+            sd->state = sd_sendingdata_state;
+            sd->data_start = 0;
+            sd->data_offset = 0;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 7:	/* CMD7:   SELECT/DESELECT_CARD */
+        switch (sd->state) {
+        case sd_standby_state:
+            if (sd->rca != rca)
+                return sd_r0;
+
+            sd->state = sd_transfer_state;
+            return sd_r1b;
+
+        case sd_transfer_state:
+        case sd_sendingdata_state:
+            if (sd->rca == rca)
+                break;
+
+            sd->state = sd_standby_state;
+            return sd_r1b;
+
+        case sd_disconnect_state:
+            if (sd->rca != rca)
+                return sd_r0;
+
+            sd->state = sd_programming_state;
+            return sd_r1b;
+
+        case sd_programming_state:
+            if (sd->rca == rca)
+                break;
+
+            sd->state = sd_disconnect_state;
+            return sd_r1b;
+
+        default:
+            break;
+        }
+        break;
+
+    case 9:	/* CMD9:   SEND_CSD */
+        switch (sd->state) {
+        case sd_standby_state:
+            if (sd->rca != rca)
+                return sd_r0;
+
+            return sd_r2_s;
+
+        default:
+            break;
+        }
+        break;
+
+    case 10:	/* CMD10:  SEND_CID */
+        switch (sd->state) {
+        case sd_standby_state:
+            if (sd->rca != rca)
+                return sd_r0;
+
+            return sd_r2_i;
+
+        default:
+            break;
+        }
+        break;
+
+    case 11:	/* CMD11:  READ_DAT_UNTIL_STOP */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->state = sd_sendingdata_state;
+            sd->data_start = req.arg;
+            sd->data_offset = 0;
+
+            if (sd->data_start + sd->blk_len > sd->size)
+                sd->card_status |= ADDRESS_ERROR;
+            return sd_r0;
+
+        default:
+            break;
+        }
+        break;
+
+    case 12:	/* CMD12:  STOP_TRANSMISSION */
+        switch (sd->state) {
+        case sd_sendingdata_state:
+            sd->state = sd_transfer_state;
+            return sd_r1b;
+
+        case sd_receivingdata_state:
+            sd->state = sd_programming_state;
+            /* Bzzzzzzztt .... Operation complete.  */
+            sd->state = sd_transfer_state;
+            return sd_r1b;
+
+        default:
+            break;
+        }
+        break;
+
+    case 13:	/* CMD13:  SEND_STATUS */
+        switch (sd->mode) {
+        case sd_data_transfer_mode:
+            if (sd->rca != rca)
+                return sd_r0;
+
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 15:	/* CMD15:  GO_INACTIVE_STATE */
+        switch (sd->mode) {
+        case sd_data_transfer_mode:
+            if (sd->rca != rca)
+                return sd_r0;
+
+            sd->state = sd_inactive_state;
+            return sd_r0;
+
+        default:
+            break;
+        }
+        break;
+
+    /* Block read commands (Classs 2) */
+    case 16:	/* CMD16:  SET_BLOCKLEN */
+        switch (sd->state) {
+        case sd_transfer_state:
+            if (req.arg > (1 << HWBLOCK_SHIFT))
+                sd->card_status |= BLOCK_LEN_ERROR;
+            else
+                sd->blk_len = req.arg;
+
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 17:	/* CMD17:  READ_SINGLE_BLOCK */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->state = sd_sendingdata_state;
+            sd->data_start = req.arg;
+            sd->data_offset = 0;
+
+            if (sd->data_start + sd->blk_len > sd->size)
+                sd->card_status |= ADDRESS_ERROR;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 18:	/* CMD18:  READ_MULTIPLE_BLOCK */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->state = sd_sendingdata_state;
+            sd->data_start = req.arg;
+            sd->data_offset = 0;
+
+            if (sd->data_start + sd->blk_len > sd->size)
+                sd->card_status |= ADDRESS_ERROR;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    /* Block write commands (Class 4) */
+    case 24:	/* CMD24:  WRITE_SINGLE_BLOCK */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->state = sd_receivingdata_state;
+            sd->data_start = req.arg;
+            sd->data_offset = 0;
+            sd->blk_written = 0;
+
+            if (sd->data_start + sd->blk_len > sd->size)
+                sd->card_status |= ADDRESS_ERROR;
+            if (sd_wp_addr(sd, sd->data_start))
+                sd->card_status |= WP_VIOLATION;
+            if (sd->csd[14] & 0x30)
+                sd->card_status |= WP_VIOLATION;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 25:	/* CMD25:  WRITE_MULTIPLE_BLOCK */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->state = sd_receivingdata_state;
+            sd->data_start = req.arg;
+            sd->data_offset = 0;
+            sd->blk_written = 0;
+
+            if (sd->data_start + sd->blk_len > sd->size)
+                sd->card_status |= ADDRESS_ERROR;
+            if (sd_wp_addr(sd, sd->data_start))
+                sd->card_status |= WP_VIOLATION;
+            if (sd->csd[14] & 0x30)
+                sd->card_status |= WP_VIOLATION;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 26:	/* CMD26:  PROGRAM_CID */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->state = sd_receivingdata_state;
+            sd->data_start = 0;
+            sd->data_offset = 0;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 27:	/* CMD27:  PROGRAM_CSD */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->state = sd_receivingdata_state;
+            sd->data_start = 0;
+            sd->data_offset = 0;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    /* Write protection (Class 6) */
+    case 28:	/* CMD28:  SET_WRITE_PROT */
+        switch (sd->state) {
+        case sd_transfer_state:
+            if (req.arg >= sd->size) {
+                sd->card_status = ADDRESS_ERROR;
+                return sd_r1b;
+            }
+
+            sd->state = sd_programming_state;
+            sd->wp_groups[req.arg >> (HWBLOCK_SHIFT +
+                            SECTOR_SHIFT + WPGROUP_SHIFT)] = 1;
+            /* Bzzzzzzztt .... Operation complete.  */
+            sd->state = sd_transfer_state;
+            return sd_r1b;
+
+        default:
+            break;
+        }
+        break;
+
+    case 29:	/* CMD29:  CLR_WRITE_PROT */
+        switch (sd->state) {
+        case sd_transfer_state:
+            if (req.arg >= sd->size) {
+                sd->card_status = ADDRESS_ERROR;
+                return sd_r1b;
+            }
+
+            sd->state = sd_programming_state;
+            sd->wp_groups[req.arg >> (HWBLOCK_SHIFT +
+                            SECTOR_SHIFT + WPGROUP_SHIFT)] = 0;
+            /* Bzzzzzzztt .... Operation complete.  */
+            sd->state = sd_transfer_state;
+            return sd_r1b;
+
+        default:
+            break;
+        }
+        break;
+
+    case 30:	/* CMD30:  SEND_WRITE_PROT */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->state = sd_sendingdata_state;
+            *(uint32_t *) sd->data = sd_wpbits(sd, req.arg);
+            sd->data_start = req.arg;
+            sd->data_offset = 0;
+            return sd_r1b;
+
+        default:
+            break;
+        }
+        break;
+
+    /* Erase commands (Class 5) */
+    case 32:	/* CMD32:  ERASE_WR_BLK_START */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->erase_start = req.arg;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 33:	/* CMD33:  ERASE_WR_BLK_END */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->erase_end = req.arg;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 38:	/* CMD38:  ERASE */
+        switch (sd->state) {
+        case sd_transfer_state:
+            if (sd->csd[14] & 0x30) {
+                sd->card_status |= WP_VIOLATION;
+                return sd_r1b;
+            }
+
+            sd->state = sd_programming_state;
+            sd_erase(sd);
+            /* Bzzzzzzztt .... Operation complete.  */
+            sd->state = sd_transfer_state;
+            return sd_r1b;
+
+        default:
+            break;
+        }
+        break;
+
+    /* Lock card commands (Class 7) */
+    case 42:	/* CMD42:  LOCK_UNLOCK */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->state = sd_receivingdata_state;
+            sd->data_start = 0;
+            sd->data_offset = 0;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    /* Application specific commands (Class 8) */
+    case 55:	/* CMD55:  APP_CMD */
+        if (sd->rca != rca)
+            return sd_r0;
+
+        sd->card_status |= APP_CMD;
+        return sd_r1;
+
+    case 56:	/* CMD56:  GEN_CMD */
+        printf("SD: GEN_CMD 0x%08x\n", req.arg);
+
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->data_offset = 0;
+            if (req.arg & 1)
+                sd->state = sd_sendingdata_state;
+            else
+                sd->state = sd_receivingdata_state;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    default:
+        sd->card_status |= ILLEGAL_COMMAND;
+
+        printf("SD: Unknown CMD%i\n", req.cmd);
+        return sd_r0;
+    }
+
+    sd->card_status |= ILLEGAL_COMMAND;
+    printf("SD: CMD%i in a wrong state\n", req.cmd);
+    return sd_r0;
+}
+
+static sd_rsp_type_t sd_app_command(SDState *sd,
+                                    struct sd_request_s req) {
+    uint32_t rca;
+
+    if (sd_cmd_type[req.cmd] == sd_ac || sd_cmd_type[req.cmd] == sd_adtc)
+        rca = req.arg >> 16;
+
+    DPRINTF("ACMD%d 0x%08x\n", req.cmd, req.arg);
+    switch (req.cmd) {
+    case 6:	/* ACMD6:  SET_BUS_WIDTH */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->sd_status[0] &= 0x3f;
+            sd->sd_status[0] |= (req.arg & 0x03) << 6;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 13:	/* ACMD13: SD_STATUS */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->data_start = 0;
+            sd->data_offset = 0;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 22:	/* ACMD22: SEND_NUM_WR_BLOCKS */
+        switch (sd->state) {
+        case sd_transfer_state:
+            *(uint32_t *) sd->data = sd->blk_written;
+
+            sd->data_start = 0;
+            sd->data_offset = 0;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 23:	/* ACMD23: SET_WR_BLK_ERASE_COUNT */
+        switch (sd->state) {
+        case sd_transfer_state:
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 41:	/* ACMD41: SD_APP_OP_COND */
+        switch (sd->state) {
+        case sd_idle_state:
+            /* We accept any voltage.  10000 V is nothing.  */
+            if (req.arg)
+                sd->state = sd_ready_state;
+
+            return sd_r3;
+
+        default:
+            break;
+        }
+        break;
+
+    case 42:	/* ACMD42: SET_CLR_CARD_DETECT */
+        switch (sd->state) {
+        case sd_transfer_state:
+            /* Bringing in the 50KOhm pull-up resistor... Done.  */
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    case 51:	/* ACMD51: SEND_SCR */
+        switch (sd->state) {
+        case sd_transfer_state:
+            sd->state = sd_sendingdata_state;
+            sd->data_start = 0;
+            sd->data_offset = 0;
+            return sd_r1;
+
+        default:
+            break;
+        }
+        break;
+
+    default:
+        /* Fall back to standard commands.  */
+        sd->card_status &= ~APP_CMD;
+        return sd_normal_command(sd, req);
+    }
+
+    printf("SD: ACMD%i in a wrong state\n", req.cmd);
+    return sd_r0;
+}
+
+int sd_do_command(SDState *sd, struct sd_request_s *req,
+                  uint8_t *response) {
+    uint32_t last_status = sd->card_status;
+    sd_rsp_type_t rtype;
+    int rsplen;
+
+    if (!bdrv_is_inserted(sd->bdrv)) {
+        return 0;
+    }
+
+    if (sd_req_crc_validate(req)) {
+        sd->card_status &= ~COM_CRC_ERROR;
+        return 0;
+    }
+
+    sd->card_status &= ~CARD_STATUS_B;
+    sd_set_status(sd);
+
+    if (last_status & CARD_IS_LOCKED)
+        if (((last_status & APP_CMD) &&
+                                 req->cmd == 41) ||
+                        (!(last_status & APP_CMD) &&
+                         (sd_cmd_class[req->cmd] == 0 ||
+                          sd_cmd_class[req->cmd] == 7 ||
+                          req->cmd == 16 || req->cmd == 55))) {
+            sd->card_status |= ILLEGAL_COMMAND;
+            printf("SD: Card is locked\n");
+            return 0;
+        }
+
+    if (last_status & APP_CMD)
+        rtype = sd_app_command(sd, *req);
+    else
+        rtype = sd_normal_command(sd, *req);
+
+    sd->current_cmd = req->cmd;
+
+    switch (rtype) {
+    case sd_r1:
+    case sd_r1b:
+        sd_response_r1_make(sd, response, last_status);
+        rsplen = 4;
+        break;
+
+    case sd_r2_i:
+        memcpy(response, sd->cid, sizeof(sd->cid));
+        response[7] |= 1;
+        rsplen = 16;
+        break;
+
+    case sd_r2_s:
+        memcpy(response, sd->csd, sizeof(sd->csd));
+        response[7] |= 1;
+        rsplen = 16;
+        break;
+
+    case sd_r3:
+        sd_response_r3_make(sd, response);
+        rsplen = 4;
+        break;
+
+    case sd_r6:
+        sd_response_r6_make(sd, response);
+        rsplen = 4;
+        break;
+
+    case sd_r0:
+    default:
+        rsplen = 0;
+        break;
+    }
+
+    if (sd->card_status & ILLEGAL_COMMAND)
+        rsplen = 0;
+
+#ifdef DEBUG_SD
+    if (rsplen) {
+        int i;
+        DPRINTF("Response:");
+        for (i = 0; i < rsplen; i++)
+            printf(" %02x", response[i]);
+        printf(" state %d\n", sd->state);
+    } else {
+        DPRINTF("No response %d\n", sd->state);
+    }
+#endif
+
+    return rsplen;
+}
+
+/* No real need for 64 bit addresses here */
+static void sd_blk_read(BlockDriverState *bdrv,
+                void *data, uint32_t addr, uint32_t len)
+{
+    uint8_t buf[512];
+    uint32_t end = addr + len;
+
+    if (!bdrv || bdrv_read(bdrv, addr >> 9, buf, 1) == -1) {
+        printf("sd_blk_read: read error on host side\n");
+        return;
+    }
+
+    if (end > (addr & ~511) + 512) {
+        memcpy(data, buf + (addr & 511), 512 - (addr & 511));
+
+        if (bdrv_read(bdrv, end >> 9, buf, 1) == -1) {
+            printf("sd_blk_read: read error on host side\n");
+            return;
+        }
+        memcpy(data + 512 - (addr & 511), buf, end & 511);
+    } else
+        memcpy(data, buf + (addr & 511), len);
+}
+
+static void sd_blk_write(BlockDriverState *bdrv,
+                void *data, uint32_t addr, uint32_t len)
+{
+    uint8_t buf[512];
+    uint32_t end = addr + len;
+
+    if ((addr & 511) || len < 512)
+        if (!bdrv || bdrv_read(bdrv, addr >> 9, buf, 1) == -1) {
+            printf("sd_blk_write: read error on host side\n");
+            return;
+        }
+
+    if (end > (addr & ~511) + 512) {
+        memcpy(buf + (addr & 511), data, 512 - (addr & 511));
+        if (bdrv_write(bdrv, addr >> 9, buf, 1) == -1) {
+            printf("sd_blk_write: write error on host side\n");
+            return;
+        }
+
+        if (bdrv_read(bdrv, end >> 9, buf, 1) == -1) {
+            printf("sd_blk_write: read error on host side\n");
+            return;
+        }
+        memcpy(buf, data + 512 - (addr & 511), end & 511);
+        if (bdrv_write(bdrv, end >> 9, buf, 1) == -1)
+            printf("sd_blk_write: write error on host side\n");
+    } else {
+        memcpy(buf + (addr & 511), data, len);
+        if (!bdrv || bdrv_write(bdrv, addr >> 9, buf, 1) == -1)
+            printf("sd_blk_write: write error on host side\n");
+    }
+}
+
+#define BLK_READ_BLOCK(a, len)	sd_blk_read(sd->bdrv, sd->data, a, len)
+#define BLK_WRITE_BLOCK(a, len)	sd_blk_write(sd->bdrv, sd->data, a, len)
+#define APP_READ_BLOCK(a, len)	memset(sd->data, 0xec, len)
+#define APP_WRITE_BLOCK(a, len)
+
+void sd_write_data(SDState *sd, uint8_t value)
+{
+    int i;
+
+    if (!sd->bdrv || !bdrv_is_inserted(sd->bdrv))
+        return;
+
+    if (sd->state != sd_receivingdata_state) {
+        printf("sd_write_data: not in Receiving-Data state\n");
+        return;
+    }
+
+    if (sd->card_status & (ADDRESS_ERROR | WP_VIOLATION))
+        return;
+
+    switch (sd->current_cmd) {
+    case 24:	/* CMD24:  WRITE_SINGLE_BLOCK */
+        sd->data[sd->data_offset ++] = value;
+        if (sd->data_offset >= sd->blk_len) {
+            /* TODO: Check CRC before committing */
+            sd->state = sd_programming_state;
+            BLK_WRITE_BLOCK(sd->data_start, sd->data_offset);
+            sd->blk_written ++;
+            sd->csd[14] |= 0x40;
+            /* Bzzzzzzztt .... Operation complete.  */
+            sd->state = sd_transfer_state;
+        }
+        break;
+
+    case 25:	/* CMD25:  WRITE_MULTIPLE_BLOCK */
+        sd->data[sd->data_offset ++] = value;
+        if (sd->data_offset >= sd->blk_len) {
+            /* TODO: Check CRC before committing */
+            sd->state = sd_programming_state;
+            BLK_WRITE_BLOCK(sd->data_start, sd->data_offset);
+            sd->blk_written ++;
+            sd->data_start += sd->blk_len;
+            sd->data_offset = 0;
+            if (sd->data_start + sd->blk_len > sd->size) {
+                sd->card_status |= ADDRESS_ERROR;
+                break;
+            }
+            if (sd_wp_addr(sd, sd->data_start)) {
+                sd->card_status |= WP_VIOLATION;
+                break;
+            }
+            sd->csd[14] |= 0x40;
+
+            /* Bzzzzzzztt .... Operation complete.  */
+            sd->state = sd_receivingdata_state;
+        }
+        break;
+
+    case 26:	/* CMD26:  PROGRAM_CID */
+        sd->data[sd->data_offset ++] = value;
+        if (sd->data_offset >= sizeof(sd->cid)) {
+            /* TODO: Check CRC before committing */
+            sd->state = sd_programming_state;
+            for (i = 0; i < sizeof(sd->cid); i ++)
+                if ((sd->cid[i] | 0x00) != sd->data[i])
+                    sd->card_status |= CID_CSD_OVERWRITE;
+
+            if (!(sd->card_status & CID_CSD_OVERWRITE))
+                for (i = 0; i < sizeof(sd->cid); i ++) {
+                    sd->cid[i] |= 0x00;
+                    sd->cid[i] &= sd->data[i];
+                }
+            /* Bzzzzzzztt .... Operation complete.  */
+            sd->state = sd_transfer_state;
+        }
+        break;
+
+    case 27:	/* CMD27:  PROGRAM_CSD */
+        sd->data[sd->data_offset ++] = value;
+        if (sd->data_offset >= sizeof(sd->csd)) {
+            /* TODO: Check CRC before committing */
+            sd->state = sd_programming_state;
+            for (i = 0; i < sizeof(sd->csd); i ++)
+                if ((sd->csd[i] | sd_csd_rw_mask[i]) !=
+                    (sd->data[i] | sd_csd_rw_mask[i]))
+                    sd->card_status |= CID_CSD_OVERWRITE;
+
+            /* Copy flag (OTP) & Permanent write protect */
+            if (sd->csd[14] & ~sd->data[14] & 0x60)
+                sd->card_status |= CID_CSD_OVERWRITE;
+
+            if (!(sd->card_status & CID_CSD_OVERWRITE))
+                for (i = 0; i < sizeof(sd->csd); i ++) {
+                    sd->csd[i] |= sd_csd_rw_mask[i];
+                    sd->csd[i] &= sd->data[i];
+                }
+            /* Bzzzzzzztt .... Operation complete.  */
+            sd->state = sd_transfer_state;
+        }
+        break;
+
+    case 42:	/* CMD42:  LOCK_UNLOCK */
+        sd->data[sd->data_offset ++] = value;
+        if (sd->data_offset >= sd->blk_len) {
+            /* TODO: Check CRC before committing */
+            sd->state = sd_programming_state;
+            sd_lock_command(sd);
+            /* Bzzzzzzztt .... Operation complete.  */
+            sd->state = sd_transfer_state;
+        }
+        break;
+
+    case 56:	/* CMD56:  GEN_CMD */
+        sd->data[sd->data_offset ++] = value;
+        if (sd->data_offset >= sd->blk_len) {
+            APP_WRITE_BLOCK(sd->data_start, sd->data_offset);
+            sd->state = sd_transfer_state;
+        }
+        break;
+
+    default:
+        printf("sd_write_data: unknown command\n");
+        break;
+    }
+}
+
+uint8_t sd_read_data(SDState *sd)
+{
+    /* TODO: Append CRCs */
+    uint8_t ret;
+
+    if (!sd->bdrv || !bdrv_is_inserted(sd->bdrv))
+        return 0x00;
+
+    if (sd->state != sd_sendingdata_state) {
+        printf("sd_read_data: not in Sending-Data state\n");
+        return 0x00;
+    }
+
+    if (sd->card_status & (ADDRESS_ERROR | WP_VIOLATION))
+        return 0x00;
+
+    switch (sd->current_cmd) {
+    case 6:	/* CMD6:   SWITCH_FUNCTION */
+        ret = sd->data[sd->data_offset ++];
+
+        if (sd->data_offset >= 64)
+            sd->state = sd_transfer_state;
+        break;
+
+    case 11:	/* CMD11:  READ_DAT_UNTIL_STOP */
+        if (sd->data_offset == 0)
+            BLK_READ_BLOCK(sd->data_start, sd->blk_len);
+        ret = sd->data[sd->data_offset ++];
+
+        if (sd->data_offset >= sd->blk_len) {
+            sd->data_start += sd->blk_len;
+            sd->data_offset = 0;
+            if (sd->data_start + sd->blk_len > sd->size) {
+                sd->card_status |= ADDRESS_ERROR;
+                break;
+            }
+        }
+        break;
+
+    case 13:	/* ACMD13: SD_STATUS */
+        ret = sd->sd_status[sd->data_offset ++];
+
+        if (sd->data_offset >= sizeof(sd->sd_status))
+            sd->state = sd_transfer_state;
+        break;
+
+    case 17:	/* CMD17:  READ_SINGLE_BLOCK */
+        if (sd->data_offset == 0)
+            BLK_READ_BLOCK(sd->data_start, sd->blk_len);
+        ret = sd->data[sd->data_offset ++];
+
+        if (sd->data_offset >= sd->blk_len)
+            sd->state = sd_transfer_state;
+        break;
+
+    case 18:	/* CMD18:  READ_MULTIPLE_BLOCK */
+        if (sd->data_offset == 0)
+            BLK_READ_BLOCK(sd->data_start, sd->blk_len);
+        ret = sd->data[sd->data_offset ++];
+
+        if (sd->data_offset >= sd->blk_len) {
+            sd->data_start += sd->blk_len;
+            sd->data_offset = 0;
+            if (sd->data_start + sd->blk_len > sd->size) {
+                sd->card_status |= ADDRESS_ERROR;
+                break;
+            }
+        }
+        break;
+
+    case 22:	/* ACMD22: SEND_NUM_WR_BLOCKS */
+        ret = sd->data[sd->data_offset ++];
+
+        if (sd->data_offset >= 4)
+            sd->state = sd_transfer_state;
+        break;
+
+    case 30:	/* CMD30:  SEND_WRITE_PROT */
+        ret = sd->data[sd->data_offset ++];
+
+        if (sd->data_offset >= 4)
+            sd->state = sd_transfer_state;
+        break;
+
+    case 51:	/* ACMD51: SEND_SCR */
+        ret = sd->scr[sd->data_offset ++];
+
+        if (sd->data_offset >= sizeof(sd->scr))
+            sd->state = sd_transfer_state;
+        break;
+
+    case 56:	/* CMD56:  GEN_CMD */
+        if (sd->data_offset == 0)
+            APP_READ_BLOCK(sd->data_start, sd->blk_len);
+        ret = sd->data[sd->data_offset ++];
+
+        if (sd->data_offset >= sd->blk_len)
+            sd->state = sd_transfer_state;
+        break;
+
+    default:
+        printf("sd_read_data: unknown command\n");
+        return 0x00;
+    }
+
+    return ret;
+}
+
+int sd_data_ready(SDState *sd)
+{
+    return sd->state == sd_sendingdata_state;
+}
diff --git a/hw/sd.h b/hw/sd.h
new file mode 100644
index 0000000..cc05dbf
--- /dev/null
+++ b/hw/sd.h
@@ -0,0 +1,82 @@
+/* 
+ * SD Memory Card emulation.  Mostly correct for MMC too.
+ *
+ * Copyright (c) 2006 Andrzej Zaborowski  <balrog@zabor.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef __hw_sd_h
+#define __hw_sd_h		1
+
+#include <vl.h>
+
+#define OUT_OF_RANGE		(1 << 31)
+#define ADDRESS_ERROR		(1 << 30)
+#define BLOCK_LEN_ERROR		(1 << 29)
+#define ERASE_SEQ_ERROR		(1 << 28)
+#define ERASE_PARAM		(1 << 27)
+#define WP_VIOLATION		(1 << 26)
+#define CARD_IS_LOCKED		(1 << 25)
+#define LOCK_UNLOCK_FAILED	(1 << 24)
+#define COM_CRC_ERROR		(1 << 23)
+#define ILLEGAL_COMMAND		(1 << 22)
+#define CARD_ECC_FAILED		(1 << 21)
+#define CC_ERROR		(1 << 20)
+#define SD_ERROR		(1 << 19)
+#define CID_CSD_OVERWRITE	(1 << 16)
+#define WP_ERASE_SKIP		(1 << 15)
+#define CARD_ECC_DISABLED	(1 << 14)
+#define ERASE_RESET		(1 << 13)
+#define CURRENT_STATE		(7 << 9)
+#define READY_FOR_DATA		(1 << 8)
+#define APP_CMD			(1 << 5)
+#define AKE_SEQ_ERROR		(1 << 3)
+
+typedef enum {
+    sd_none = -1,
+    sd_bc = 0,	/* broadcast -- no response */
+    sd_bcr,		/* broadcast with response */
+    sd_ac,		/* addressed -- no data transfer */
+    sd_adtc,	/* addressed with data transfer */
+} sd_cmd_type_t;
+
+struct sd_request_s {
+    uint8_t cmd;
+    uint32_t arg;
+    uint8_t crc;
+};
+
+typedef struct SDState SDState;
+
+SDState *sd_init(BlockDriverState *bs);
+int sd_do_command(SDState *sd, struct sd_request_s *req,
+                  uint8_t *response);
+void sd_write_data(SDState *sd, uint8_t value);
+uint8_t sd_read_data(SDState *sd);
+void sd_set_cb(SDState *sd, void *opaque,
+               void (*readonly_cb)(void *, int),
+               void (*inserted_cb)(void *, int));
+int sd_data_ready(SDState *sd);
+
+#endif	/* __hw_sd_h */
diff --git a/hw/versatilepb.c b/hw/versatilepb.c
index 5d3e857..a91d7ef 100644
--- a/hw/versatilepb.c
+++ b/hw/versatilepb.c
@@ -1,7 +1,7 @@
 /* 
  * ARM Versatile Platform/Application Baseboard System emulation.
  *
- * Copyright (c) 2005-2006 CodeSourcery.
+ * Copyright (c) 2005-2007 CodeSourcery.
  * Written by Paul Brook
  *
  * This code is licenced under the GPL.
@@ -217,19 +217,25 @@ static void versatile_init(int ram_size, int vga_ram_size, int boot_device,
        that includes hardware cursor support from the PL111.  */
     pl110_init(ds, 0x10120000, pic, 16, 1);
 
+    pl181_init(0x10005000, sd_bdrv, sic, 22, 1);
+#if 0
+    /* Disabled because there's no way of specifying a block device.  */
+    pl181_init(0x1000b000, NULL, sic, 23, 2);
+#endif
+
     /* Memory map for Versatile/PB:  */
     /* 0x10000000 System registers.  */
     /* 0x10001000 PCI controller config registers.  */
     /* 0x10002000 Serial bus interface.  */
     /*  0x10003000 Secondary interrupt controller.  */
     /* 0x10004000 AACI (audio).  */
-    /* 0x10005000 MMCI0.  */
+    /*  0x10005000 MMCI0.  */
     /*  0x10006000 KMI0 (keyboard).  */
     /*  0x10007000 KMI1 (mouse).  */
     /* 0x10008000 Character LCD Interface.  */
     /*  0x10009000 UART3.  */
     /* 0x1000a000 Smart card 1.  */
-    /* 0x1000b000 MMCI1.  */
+    /*  0x1000b000 MMCI1.  */
     /*  0x10010000 Ethernet.  */
     /* 0x10020000 USB.  */
     /* 0x10100000 SSMC.  */
diff --git a/qemu-doc.texi b/qemu-doc.texi
index 5db875c..b5c9131 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -1719,6 +1719,8 @@ SMC 91c111 Ethernet adapter
 PL110 LCD controller
 @item
 PL050 KMI with PS/2 keyboard and mouse.
+@item
+PL181 MultiMedia Card Interface with SD card.
 @end itemize
 
 The ARM Versatile baseboard is emulated with the following devices:
@@ -1746,6 +1748,8 @@ mapped control registers.
 PCI OHCI USB controller.
 @item
 LSI53C895A PCI SCSI Host Bus Adapter with hard disk and CD-ROM devices.
+@item
+PL181 MultiMedia Card Interface with SD card.
 @end itemize
 
 The ARM RealView Emulation baseboard is emulated with the following devices:
@@ -1769,6 +1773,8 @@ PCI host bridge
 PCI OHCI USB controller
 @item
 LSI53C895A PCI SCSI Host Bus Adapter with hard disk and CD-ROM devices
+@item
+PL181 MultiMedia Card Interface with SD card.
 @end itemize
 
 A Linux 2.6 test image is available on the QEMU web site. More
diff --git a/vl.c b/vl.c
index 355f7ff..853b891 100644
--- a/vl.c
+++ b/vl.c
@@ -138,6 +138,7 @@ IOPortWriteFunc *ioport_write_table[3][MAX_IOPORTS];
 /* Note: bs_table[MAX_DISKS] is a dummy block driver if none available
    to store the VM snapshots */
 BlockDriverState *bs_table[MAX_DISKS + 1], *fd_table[MAX_FD];
+BlockDriverState *sd_bdrv;
 /* point to the block driver where the snapshots are managed */
 BlockDriverState *bs_snapshots;
 int vga_ram_size;
@@ -6345,6 +6346,7 @@ void help(void)
            "-hda/-hdb file  use 'file' as IDE hard disk 0/1 image\n"
            "-hdc/-hdd file  use 'file' as IDE hard disk 2/3 image\n"
            "-cdrom file     use 'file' as IDE cdrom image (cdrom is ide1 master)\n"
+           "-sd file        use 'file' as SecureDigital card image\n"
            "-boot [a|c|d|n] boot on floppy (a), hard disk (c), CD-ROM (d), or network (n)\n"
            "-snapshot       write to temporary files instead of disk image files\n"
 #ifdef CONFIG_SDL
@@ -6482,6 +6484,7 @@ enum {
     QEMU_OPTION_hdc,
     QEMU_OPTION_hdd,
     QEMU_OPTION_cdrom,
+    QEMU_OPTION_sd,
     QEMU_OPTION_boot,
     QEMU_OPTION_snapshot,
 #ifdef TARGET_I386
@@ -6560,6 +6563,7 @@ const QEMUOption qemu_options[] = {
     { "hdc", HAS_ARG, QEMU_OPTION_hdc },
     { "hdd", HAS_ARG, QEMU_OPTION_hdd },
     { "cdrom", HAS_ARG, QEMU_OPTION_cdrom },
+    { "sd", HAS_ARG, QEMU_OPTION_sd },
     { "boot", HAS_ARG, QEMU_OPTION_boot },
     { "snapshot", 0, QEMU_OPTION_snapshot },
 #ifdef TARGET_I386
@@ -6847,6 +6851,7 @@ int main(int argc, char **argv)
     int snapshot, linux_boot;
     const char *initrd_filename;
     const char *hd_filename[MAX_DISKS], *fd_filename[MAX_FD];
+    const char *sd_filename;
     const char *kernel_filename, *kernel_cmdline;
     DisplayState *ds = &display_state;
     int cyls, heads, secs, translation;
@@ -6907,6 +6912,7 @@ int main(int argc, char **argv)
         fd_filename[i] = NULL;
     for(i = 0; i < MAX_DISKS; i++)
         hd_filename[i] = NULL;
+    sd_filename = NULL;
     ram_size = DEFAULT_RAM_SIZE * 1024 * 1024;
     vga_ram_size = VGA_RAM_SIZE;
 #ifdef CONFIG_GDBSTUB
@@ -7025,6 +7031,9 @@ int main(int argc, char **argv)
                         cdrom_index = -1;
                 }
                 break;
+            case QEMU_OPTION_sd:
+                sd_filename = optarg;
+                break;
             case QEMU_OPTION_snapshot:
                 snapshot = 1;
                 break;
@@ -7523,7 +7532,7 @@ int main(int argc, char **argv)
                 fd_table[i] = bdrv_new(buf);
                 bdrv_set_type_hint(fd_table[i], BDRV_TYPE_FLOPPY);
             }
-            if (fd_filename[i] != '\0') {
+            if (fd_filename[i][0] != '\0') {
                 if (bdrv_open(fd_table[i], fd_filename[i],
                               snapshot ? BDRV_O_SNAPSHOT : 0) < 0) {
                     fprintf(stderr, "qemu: could not open floppy disk image '%s'\n",
@@ -7534,6 +7543,18 @@ int main(int argc, char **argv)
         }
     }
 
+    sd_bdrv = bdrv_new ("sd");
+    /* FIXME: This isn't really a floppy, but it's a reasonable
+       approximation.  */
+    bdrv_set_type_hint(sd_bdrv, BDRV_TYPE_FLOPPY);
+    if (sd_filename) {
+        if (bdrv_open(sd_bdrv, sd_filename,
+                      snapshot ? BDRV_O_SNAPSHOT : 0) < 0) {
+            fprintf(stderr, "qemu: could not open SD card image %s\n",
+                    sd_filename);
+        }
+    }
+
     register_savevm("timer", 0, 2, timer_save, timer_load, NULL);
     register_savevm("ram", 0, 2, ram_save, ram_load, NULL);
 
diff --git a/vl.h b/vl.h
index d44d6aa..eb87a51 100644
--- a/vl.h
+++ b/vl.h
@@ -956,6 +956,7 @@ extern uint8_t _translate_keycode(const int key);
 #define MAX_DISKS 4
 
 extern BlockDriverState *bs_table[MAX_DISKS + 1];
+extern BlockDriverState *sd_bdrv;
 
 void isa_ide_init(int iobase, int iobase2, int irq,
                   BlockDriverState *hd0, BlockDriverState *hd1);
@@ -1385,6 +1386,10 @@ void pl050_init(uint32_t base, void *pic, int irq, int is_mouse);
 /* pl080.c */
 void *pl080_init(uint32_t base, void *pic, int irq, int nchannels);
 
+/* pl181.c */
+void pl181_init(uint32_t base, BlockDriverState *bd,
+                void *pic, int irq0, int irq1);
+
 /* pl190.c */
 void *pl190_init(uint32_t base, void *parent, int irq, int fiq);