auto import from //depot/cupcake/@135843

1 files changed, 809 insertions, 0 deletions

diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
new file mode 100644
index 0000000..16b3215
--- /dev/null
+++ b/hw/scsi-disk.c
@@ -0,0 +1,809 @@
+/*
+ * SCSI Device emulation
+ *
+ * Copyright (c) 2006 CodeSourcery.
+ * Based on code by Fabrice Bellard
+ *
+ * Written by Paul Brook
+ *
+ * This code is licenced under the LGPL.
+ *
+ * Note that this file only handles the SCSI architecture model and device
+ * commands.  Emulation of interface/link layer protocols is handled by
+ * the host adapter emulator.
+ */
+
+//#define DEBUG_SCSI
+
+#ifdef DEBUG_SCSI
+#define DPRINTF(fmt, args...) \
+do { printf("scsi-disk: " fmt , ##args); } while (0)
+#else
+#define DPRINTF(fmt, args...) do {} while(0)
+#endif
+
+#define BADF(fmt, args...) \
+do { fprintf(stderr, "scsi-disk: " fmt , ##args); } while (0)
+
+#include "qemu-common.h"
+#include "block.h"
+#include "scsi-disk.h"
+
+#define SENSE_NO_SENSE        0
+#define SENSE_NOT_READY       2
+#define SENSE_HARDWARE_ERROR  4
+#define SENSE_ILLEGAL_REQUEST 5
+
+#define SCSI_DMA_BUF_SIZE    65536
+
+typedef struct SCSIRequest {
+    SCSIDeviceState *dev;
+    uint32_t tag;
+    /* ??? We should probably keep track of whether the data trasfer is
+       a read or a write.  Currently we rely on the host getting it right.  */
+    /* Both sector and sector_count are in terms of qemu 512 byte blocks.  */
+    int sector;
+    int sector_count;
+    /* The amounnt of data in the buffer.  */
+    int buf_len;
+    uint8_t *dma_buf;
+    BlockDriverAIOCB *aiocb;
+    struct SCSIRequest *next;
+} SCSIRequest;
+
+struct SCSIDeviceState
+{
+    BlockDriverState *bdrv;
+    SCSIRequest *requests;
+    /* The qemu block layer uses a fixed 512 byte sector size.
+       This is the number of 512 byte blocks in a single scsi sector.  */
+    int cluster_size;
+    int sense;
+    int tcq;
+    /* Completion functions may be called from either scsi_{read,write}_data
+       or from the AIO completion routines.  */
+    scsi_completionfn completion;
+    void *opaque;
+};
+
+/* Global pool of SCSIRequest structures.  */
+static SCSIRequest *free_requests = NULL;
+
+static SCSIRequest *scsi_new_request(SCSIDeviceState *s, uint32_t tag)
+{
+    SCSIRequest *r;
+
+    if (free_requests) {
+        r = free_requests;
+        free_requests = r->next;
+    } else {
+        r = qemu_malloc(sizeof(SCSIRequest));
+        r->dma_buf = qemu_memalign(512, SCSI_DMA_BUF_SIZE);
+    }
+    r->dev = s;
+    r->tag = tag;
+    r->sector_count = 0;
+    r->buf_len = 0;
+    r->aiocb = NULL;
+
+    r->next = s->requests;
+    s->requests = r;
+    return r;
+}
+
+static void scsi_remove_request(SCSIRequest *r)
+{
+    SCSIRequest *last;
+    SCSIDeviceState *s = r->dev;
+
+    if (s->requests == r) {
+        s->requests = r->next;
+    } else {
+        last = s->requests;
+        while (last && last->next != r)
+            last = last->next;
+        if (last) {
+            last->next = r->next;
+        } else {
+            BADF("Orphaned request\n");
+        }
+    }
+    r->next = free_requests;
+    free_requests = r;
+}
+
+static SCSIRequest *scsi_find_request(SCSIDeviceState *s, uint32_t tag)
+{
+    SCSIRequest *r;
+
+    r = s->requests;
+    while (r && r->tag != tag)
+        r = r->next;
+
+    return r;
+}
+
+/* Helper function for command completion.  */
+static void scsi_command_complete(SCSIRequest *r, int sense)
+{
+    SCSIDeviceState *s = r->dev;
+    uint32_t tag;
+    DPRINTF("Command complete tag=0x%x sense=%d\n", r->tag, sense);
+    s->sense = sense;
+    tag = r->tag;
+    scsi_remove_request(r);
+    s->completion(s->opaque, SCSI_REASON_DONE, tag, sense);
+}
+
+/* Cancel a pending data transfer.  */
+static void scsi_cancel_io(SCSIDevice *d, uint32_t tag)
+{
+    SCSIDeviceState *s = d->state;
+    SCSIRequest *r;
+    DPRINTF("Cancel tag=0x%x\n", tag);
+    r = scsi_find_request(s, tag);
+    if (r) {
+        if (r->aiocb)
+            bdrv_aio_cancel(r->aiocb);
+        r->aiocb = NULL;
+        scsi_remove_request(r);
+    }
+}
+
+static void scsi_read_complete(void * opaque, int ret)
+{
+    SCSIRequest *r = (SCSIRequest *)opaque;
+    SCSIDeviceState *s = r->dev;
+
+    if (ret) {
+        DPRINTF("IO error\n");
+        scsi_command_complete(r, SENSE_HARDWARE_ERROR);
+        return;
+    }
+    DPRINTF("Data ready tag=0x%x len=%d\n", r->tag, r->buf_len);
+
+    s->completion(s->opaque, SCSI_REASON_DATA, r->tag, r->buf_len);
+}
+
+/* Read more data from scsi device into buffer.  */
+static void scsi_read_data(SCSIDevice *d, uint32_t tag)
+{
+    SCSIDeviceState *s = d->state;
+    SCSIRequest *r;
+    uint32_t n;
+
+    r = scsi_find_request(s, tag);
+    if (!r) {
+        BADF("Bad read tag 0x%x\n", tag);
+        /* ??? This is the wrong error.  */
+        scsi_command_complete(r, SENSE_HARDWARE_ERROR);
+        return;
+    }
+    if (r->sector_count == (uint32_t)-1) {
+        DPRINTF("Read buf_len=%d\n", r->buf_len);
+        r->sector_count = 0;
+        s->completion(s->opaque, SCSI_REASON_DATA, r->tag, r->buf_len);
+        return;
+    }
+    DPRINTF("Read sector_count=%d\n", r->sector_count);
+    if (r->sector_count == 0) {
+        scsi_command_complete(r, SENSE_NO_SENSE);
+        return;
+    }
+
+    n = r->sector_count;
+    if (n > SCSI_DMA_BUF_SIZE / 512)
+        n = SCSI_DMA_BUF_SIZE / 512;
+
+    r->buf_len = n * 512;
+    r->aiocb = bdrv_aio_read(s->bdrv, r->sector, r->dma_buf, n,
+                             scsi_read_complete, r);
+    if (r->aiocb == NULL)
+        scsi_command_complete(r, SENSE_HARDWARE_ERROR);
+    r->sector += n;
+    r->sector_count -= n;
+}
+
+static void scsi_write_complete(void * opaque, int ret)
+{
+    SCSIRequest *r = (SCSIRequest *)opaque;
+    SCSIDeviceState *s = r->dev;
+    uint32_t len;
+
+    if (ret) {
+        fprintf(stderr, "scsi-disc: IO write error\n");
+        exit(1);
+    }
+
+    r->aiocb = NULL;
+    if (r->sector_count == 0) {
+        scsi_command_complete(r, SENSE_NO_SENSE);
+    } else {
+        len = r->sector_count * 512;
+        if (len > SCSI_DMA_BUF_SIZE) {
+            len = SCSI_DMA_BUF_SIZE;
+        }
+        r->buf_len = len;
+        DPRINTF("Write complete tag=0x%x more=%d\n", r->tag, len);
+        s->completion(s->opaque, SCSI_REASON_DATA, r->tag, len);
+    }
+}
+
+/* Write data to a scsi device.  Returns nonzero on failure.
+   The transfer may complete asynchronously.  */
+static int scsi_write_data(SCSIDevice *d, uint32_t tag)
+{
+    SCSIDeviceState *s = d->state;
+    SCSIRequest *r;
+    uint32_t n;
+
+    DPRINTF("Write data tag=0x%x\n", tag);
+    r = scsi_find_request(s, tag);
+    if (!r) {
+        BADF("Bad write tag 0x%x\n", tag);
+        scsi_command_complete(r, SENSE_HARDWARE_ERROR);
+        return 1;
+    }
+    if (r->aiocb)
+        BADF("Data transfer already in progress\n");
+    n = r->buf_len / 512;
+    if (n) {
+        r->aiocb = bdrv_aio_write(s->bdrv, r->sector, r->dma_buf, n,
+                                  scsi_write_complete, r);
+        if (r->aiocb == NULL)
+            scsi_command_complete(r, SENSE_HARDWARE_ERROR);
+        r->sector += n;
+        r->sector_count -= n;
+    } else {
+        /* Invoke completion routine to fetch data from host.  */
+        scsi_write_complete(r, 0);
+    }
+
+    return 0;
+}
+
+/* Return a pointer to the data buffer.  */
+static uint8_t *scsi_get_buf(SCSIDevice *d, uint32_t tag)
+{
+    SCSIDeviceState *s = d->state;
+    SCSIRequest *r;
+
+    r = scsi_find_request(s, tag);
+    if (!r) {
+        BADF("Bad buffer tag 0x%x\n", tag);
+        return NULL;
+    }
+    return r->dma_buf;
+}
+
+/* Execute a scsi command.  Returns the length of the data expected by the
+   command.  This will be Positive for data transfers from the device
+   (eg. disk reads), negative for transfers to the device (eg. disk writes),
+   and zero if the command does not transfer any data.  */
+
+static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
+                                 uint8_t *buf, int lun)
+{
+    SCSIDeviceState *s = d->state;
+    uint64_t nb_sectors;
+    uint32_t lba;
+    uint32_t len;
+    int cmdlen;
+    int is_write;
+    uint8_t command;
+    uint8_t *outbuf;
+    SCSIRequest *r;
+
+    command = buf[0];
+    r = scsi_find_request(s, tag);
+    if (r) {
+        BADF("Tag 0x%x already in use\n", tag);
+        scsi_cancel_io(d, tag);
+    }
+    /* ??? Tags are not unique for different luns.  We only implement a
+       single lun, so this should not matter.  */
+    r = scsi_new_request(s, tag);
+    outbuf = r->dma_buf;
+    is_write = 0;
+    DPRINTF("Command: lun=%d tag=0x%x data=0x%02x", lun, tag, buf[0]);
+    switch (command >> 5) {
+    case 0:
+        lba = buf[3] | (buf[2] << 8) | ((buf[1] & 0x1f) << 16);
+        len = buf[4];
+        cmdlen = 6;
+        break;
+    case 1:
+    case 2:
+        lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
+        len = buf[8] | (buf[7] << 8);
+        cmdlen = 10;
+        break;
+    case 4:
+        lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
+        len = buf[13] | (buf[12] << 8) | (buf[11] << 16) | (buf[10] << 24);
+        cmdlen = 16;
+        break;
+    case 5:
+        lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
+        len = buf[9] | (buf[8] << 8) | (buf[7] << 16) | (buf[6] << 24);
+        cmdlen = 12;
+        break;
+    default:
+        BADF("Unsupported command length, command %x\n", command);
+        goto fail;
+    }
+#ifdef DEBUG_SCSI
+    {
+        int i;
+        for (i = 1; i < cmdlen; i++) {
+            printf(" 0x%02x", buf[i]);
+        }
+        printf("\n");
+    }
+#endif
+    if (lun || buf[1] >> 5) {
+        /* Only LUN 0 supported.  */
+        DPRINTF("Unimplemented LUN %d\n", lun ? lun : buf[1] >> 5);
+        goto fail;
+    }
+    switch (command) {
+    case 0x0:
+	DPRINTF("Test Unit Ready\n");
+	break;
+    case 0x03:
+        DPRINTF("Request Sense (len %d)\n", len);
+        if (len < 4)
+            goto fail;
+        memset(outbuf, 0, 4);
+        outbuf[0] = 0xf0;
+        outbuf[1] = 0;
+        outbuf[2] = s->sense;
+        r->buf_len = 4;
+        break;
+    case 0x12:
+        DPRINTF("Inquiry (len %d)\n", len);
+        if (buf[1] & 0x2) {
+            /* Command support data - optional, not implemented */
+            BADF("optional INQUIRY command support request not implemented\n");
+            goto fail;
+        }
+        else if (buf[1] & 0x1) {
+            /* Vital product data */
+            uint8_t page_code = buf[2];
+            if (len < 4) {
+                BADF("Error: Inquiry (EVPD[%02X]) buffer size %d is "
+                     "less than 4\n", page_code, len);
+                goto fail;
+            }
+
+            switch (page_code) {
+                case 0x00:
+                    {
+                        /* Supported page codes, mandatory */
+                        DPRINTF("Inquiry EVPD[Supported pages] "
+                                "buffer size %d\n", len);
+
+                        r->buf_len = 0;
+
+                        if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
+                            outbuf[r->buf_len++] = 5;
+                        } else {
+                            outbuf[r->buf_len++] = 0;
+                        }
+
+                        outbuf[r->buf_len++] = 0x00; // this page
+                        outbuf[r->buf_len++] = 0x00;
+                        outbuf[r->buf_len++] = 3;    // number of pages
+                        outbuf[r->buf_len++] = 0x00; // list of supported pages (this page)
+                        outbuf[r->buf_len++] = 0x80; // unit serial number
+                        outbuf[r->buf_len++] = 0x83; // device identification
+                    }
+                    break;
+                case 0x80:
+                    {
+                        /* Device serial number, optional */
+                        if (len < 4) {
+                            BADF("Error: EVPD[Serial number] Inquiry buffer "
+                                 "size %d too small, %d needed\n", len, 4);
+                            goto fail;
+                        }
+
+                        DPRINTF("Inquiry EVPD[Serial number] buffer size %d\n", len);
+
+                        r->buf_len = 0;
+
+                        /* Supported page codes */
+                        if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
+                            outbuf[r->buf_len++] = 5;
+                        } else {
+                            outbuf[r->buf_len++] = 0;
+                        }
+
+                        outbuf[r->buf_len++] = 0x80; // this page
+                        outbuf[r->buf_len++] = 0x00;
+                        outbuf[r->buf_len++] = 0x01; // 1 byte data follow
+
+                        outbuf[r->buf_len++] = '0';  // 1 byte data follow 
+                    }
+
+                    break;
+                case 0x83:
+                    {
+                        /* Device identification page, mandatory */
+                        int max_len = 255 - 8;
+                        int id_len = strlen(bdrv_get_device_name(s->bdrv));
+                        if (id_len > max_len)
+                            id_len = max_len;
+
+                        DPRINTF("Inquiry EVPD[Device identification] "
+                                "buffer size %d\n", len);
+                        r->buf_len = 0;
+                        if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
+                            outbuf[r->buf_len++] = 5;
+                        } else {
+                            outbuf[r->buf_len++] = 0;
+                        }
+
+                        outbuf[r->buf_len++] = 0x83; // this page
+                        outbuf[r->buf_len++] = 0x00;
+                        outbuf[r->buf_len++] = 3 + id_len;
+
+                        outbuf[r->buf_len++] = 0x2; // ASCII
+                        outbuf[r->buf_len++] = 0;   // not officially assigned
+                        outbuf[r->buf_len++] = 0;   // reserved
+                        outbuf[r->buf_len++] = id_len; // length of data following
+
+                        memcpy(&outbuf[r->buf_len],
+                               bdrv_get_device_name(s->bdrv), id_len);
+                        r->buf_len += id_len;
+                    }
+                    break;
+                default:
+                    BADF("Error: unsupported Inquiry (EVPD[%02X]) "
+                         "buffer size %d\n", page_code, len);
+                    goto fail;
+            }
+            /* done with EVPD */
+            break;
+        }
+        else {
+            /* Standard INQUIRY data */
+            if (buf[2] != 0) {
+                BADF("Error: Inquiry (STANDARD) page or code "
+                     "is non-zero [%02X]\n", buf[2]);
+                goto fail;
+            }
+
+            /* PAGE CODE == 0 */
+            if (len < 5) {
+                BADF("Error: Inquiry (STANDARD) buffer size %d "
+                     "is less than 5\n", len);
+                goto fail;
+            }
+
+            if (len < 36) {
+                BADF("Error: Inquiry (STANDARD) buffer size %d "
+                     "is less than 36 (TODO: only 5 required)\n", len);
+            }
+        }
+	memset(outbuf, 0, 36);
+	if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
+	    outbuf[0] = 5;
+            outbuf[1] = 0x80;
+	    memcpy(&outbuf[16], "QEMU CD-ROM    ", 16);
+	} else {
+	    outbuf[0] = 0;
+	    memcpy(&outbuf[16], "QEMU HARDDISK  ", 16);
+	}
+	memcpy(&outbuf[8], "QEMU   ", 8);
+        memcpy(&outbuf[32], QEMU_VERSION, 4);
+        /* Identify device as SCSI-3 rev 1.
+           Some later commands are also implemented. */
+	outbuf[2] = 3;
+	outbuf[3] = 2; /* Format 2 */
+	outbuf[4] = 31;
+        /* Sync data transfer and TCQ.  */
+        outbuf[7] = 0x10 | (s->tcq ? 0x02 : 0);
+	r->buf_len = 36;
+	break;
+    case 0x16:
+        DPRINTF("Reserve(6)\n");
+        if (buf[1] & 1)
+            goto fail;
+        break;
+    case 0x17:
+        DPRINTF("Release(6)\n");
+        if (buf[1] & 1)
+            goto fail;
+        break;
+    case 0x1a:
+    case 0x5a:
+        {
+            uint8_t *p;
+            int page;
+
+            page = buf[2] & 0x3f;
+            DPRINTF("Mode Sense (page %d, len %d)\n", page, len);
+            p = outbuf;
+            memset(p, 0, 4);
+            outbuf[1] = 0; /* Default media type.  */
+            outbuf[3] = 0; /* Block descriptor length.  */
+            if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
+                outbuf[2] = 0x80; /* Readonly.  */
+            }
+            p += 4;
+            if (page == 4) {
+                int cylinders, heads, secs;
+
+                /* Rigid disk device geometry page. */
+                p[0] = 4;
+                p[1] = 0x16;
+                /* if a geometry hint is available, use it */
+                bdrv_get_geometry_hint(s->bdrv, &cylinders, &heads, &secs);
+                p[2] = (cylinders >> 16) & 0xff;
+                p[3] = (cylinders >> 8) & 0xff;
+                p[4] = cylinders & 0xff;
+                p[5] = heads & 0xff;
+                /* Write precomp start cylinder, disabled */
+                p[6] = (cylinders >> 16) & 0xff;
+                p[7] = (cylinders >> 8) & 0xff;
+                p[8] = cylinders & 0xff;
+                /* Reduced current start cylinder, disabled */
+                p[9] = (cylinders >> 16) & 0xff;
+                p[10] = (cylinders >> 8) & 0xff;
+                p[11] = cylinders & 0xff;
+                /* Device step rate [ns], 200ns */
+                p[12] = 0;
+                p[13] = 200;
+                /* Landing zone cylinder */
+                p[14] = 0xff;
+                p[15] =  0xff;
+                p[16] = 0xff;
+                /* Medium rotation rate [rpm], 5400 rpm */
+                p[20] = (5400 >> 8) & 0xff;
+                p[21] = 5400 & 0xff;
+                p += 0x16;
+            } else if (page == 5) {
+                int cylinders, heads, secs;
+
+                /* Flexible disk device geometry page. */
+                p[0] = 5;
+                p[1] = 0x1e;
+                /* Transfer rate [kbit/s], 5Mbit/s */
+                p[2] = 5000 >> 8;
+                p[3] = 5000 & 0xff;
+                /* if a geometry hint is available, use it */
+                bdrv_get_geometry_hint(s->bdrv, &cylinders, &heads, &secs);
+                p[4] = heads & 0xff;
+                p[5] = secs & 0xff;
+                p[6] = s->cluster_size * 2;
+                p[8] = (cylinders >> 8) & 0xff;
+                p[9] = cylinders & 0xff;
+                /* Write precomp start cylinder, disabled */
+                p[10] = (cylinders >> 8) & 0xff;
+                p[11] = cylinders & 0xff;
+                /* Reduced current start cylinder, disabled */
+                p[12] = (cylinders >> 8) & 0xff;
+                p[13] = cylinders & 0xff;
+                /* Device step rate [100us], 100us */
+                p[14] = 0;
+                p[15] = 1;
+                /* Device step pulse width [us], 1us */
+                p[16] = 1;
+                /* Device head settle delay [100us], 100us */
+                p[17] = 0;
+                p[18] = 1;
+                /* Motor on delay [0.1s], 0.1s */
+                p[19] = 1;
+                /* Motor off delay [0.1s], 0.1s */
+                p[20] = 1;
+                /* Medium rotation rate [rpm], 5400 rpm */
+                p[28] = (5400 >> 8) & 0xff;
+                p[29] = 5400 & 0xff;
+                p += 0x1e;
+            } else if ((page == 8 || page == 0x3f)) {
+                /* Caching page.  */
+                memset(p,0,20);
+                p[0] = 8;
+                p[1] = 0x12;
+                p[2] = 4; /* WCE */
+                p += 20;
+            }
+            if ((page == 0x3f || page == 0x2a)
+                    && (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM)) {
+                /* CD Capabilities and Mechanical Status page. */
+                p[0] = 0x2a;
+                p[1] = 0x14;
+                p[2] = 3; // CD-R & CD-RW read
+                p[3] = 0; // Writing not supported
+                p[4] = 0x7f; /* Audio, composite, digital out,
+                                         mode 2 form 1&2, multi session */
+                p[5] = 0xff; /* CD DA, DA accurate, RW supported,
+                                         RW corrected, C2 errors, ISRC,
+                                         UPC, Bar code */
+                p[6] = 0x2d | (bdrv_is_locked(s->bdrv)? 2 : 0);
+                /* Locking supported, jumper present, eject, tray */
+                p[7] = 0; /* no volume & mute control, no
+                                      changer */
+                p[8] = (50 * 176) >> 8; // 50x read speed
+                p[9] = (50 * 176) & 0xff;
+                p[10] = 0 >> 8; // No volume
+                p[11] = 0 & 0xff;
+                p[12] = 2048 >> 8; // 2M buffer
+                p[13] = 2048 & 0xff;
+                p[14] = (16 * 176) >> 8; // 16x read speed current
+                p[15] = (16 * 176) & 0xff;
+                p[18] = (16 * 176) >> 8; // 16x write speed
+                p[19] = (16 * 176) & 0xff;
+                p[20] = (16 * 176) >> 8; // 16x write speed current
+                p[21] = (16 * 176) & 0xff;
+                p += 22;
+            }
+            r->buf_len = p - outbuf;
+            outbuf[0] = r->buf_len - 4;
+            if (r->buf_len > len)
+                r->buf_len = len;
+        }
+        break;
+    case 0x1b:
+        DPRINTF("Start Stop Unit\n");
+	break;
+    case 0x1e:
+        DPRINTF("Prevent Allow Medium Removal (prevent = %d)\n", buf[4] & 3);
+        bdrv_set_locked(s->bdrv, buf[4] & 1);
+	break;
+    case 0x25:
+	DPRINTF("Read Capacity\n");
+        /* The normal LEN field for this command is zero.  */
+	memset(outbuf, 0, 8);
+	bdrv_get_geometry(s->bdrv, &nb_sectors);
+        /* Returned value is the address of the last sector.  */
+        if (nb_sectors) {
+            nb_sectors--;
+            outbuf[0] = (nb_sectors >> 24) & 0xff;
+            outbuf[1] = (nb_sectors >> 16) & 0xff;
+            outbuf[2] = (nb_sectors >> 8) & 0xff;
+            outbuf[3] = nb_sectors & 0xff;
+            outbuf[4] = 0;
+            outbuf[5] = 0;
+            outbuf[6] = s->cluster_size * 2;
+            outbuf[7] = 0;
+            r->buf_len = 8;
+        } else {
+            scsi_command_complete(r, SENSE_NOT_READY);
+            return 0;
+        }
+	break;
+    case 0x08:
+    case 0x28:
+        DPRINTF("Read (sector %d, count %d)\n", lba, len);
+        r->sector = lba * s->cluster_size;
+        r->sector_count = len * s->cluster_size;
+        break;
+    case 0x0a:
+    case 0x2a:
+        DPRINTF("Write (sector %d, count %d)\n", lba, len);
+        r->sector = lba * s->cluster_size;
+        r->sector_count = len * s->cluster_size;
+        is_write = 1;
+        break;
+    case 0x35:
+        DPRINTF("Synchronise cache (sector %d, count %d)\n", lba, len);
+        bdrv_flush(s->bdrv);
+        break;
+    case 0x43:
+        {
+            int start_track, format, msf, toclen;
+
+            msf = buf[1] & 2;
+            format = buf[2] & 0xf;
+            start_track = buf[6];
+            bdrv_get_geometry(s->bdrv, &nb_sectors);
+            DPRINTF("Read TOC (track %d format %d msf %d)\n", start_track, format, msf >> 1);
+            switch(format) {
+            case 0:
+                toclen = cdrom_read_toc(nb_sectors, outbuf, msf, start_track);
+                break;
+            case 1:
+                /* multi session : only a single session defined */
+                toclen = 12;
+                memset(outbuf, 0, 12);
+                outbuf[1] = 0x0a;
+                outbuf[2] = 0x01;
+                outbuf[3] = 0x01;
+                break;
+            case 2:
+                toclen = cdrom_read_toc_raw(nb_sectors, outbuf, msf, start_track);
+                break;
+            default:
+                goto error_cmd;
+            }
+            if (toclen > 0) {
+                if (len > toclen)
+                  len = toclen;
+                r->buf_len = len;
+                break;
+            }
+        error_cmd:
+            DPRINTF("Read TOC error\n");
+            goto fail;
+        }
+    case 0x46:
+        DPRINTF("Get Configuration (rt %d, maxlen %d)\n", buf[1] & 3, len);
+        memset(outbuf, 0, 8);
+        /* ??? This should probably return much more information.  For now
+           just return the basic header indicating the CD-ROM profile.  */
+        outbuf[7] = 8; // CD-ROM
+        r->buf_len = 8;
+        break;
+    case 0x56:
+        DPRINTF("Reserve(10)\n");
+        if (buf[1] & 3)
+            goto fail;
+        break;
+    case 0x57:
+        DPRINTF("Release(10)\n");
+        if (buf[1] & 3)
+            goto fail;
+        break;
+    case 0xa0:
+        DPRINTF("Report LUNs (len %d)\n", len);
+        if (len < 16)
+            goto fail;
+        memset(outbuf, 0, 16);
+        outbuf[3] = 8;
+        r->buf_len = 16;
+        break;
+    default:
+	DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]);
+    fail:
+        scsi_command_complete(r, SENSE_ILLEGAL_REQUEST);
+	return 0;
+    }
+    if (r->sector_count == 0 && r->buf_len == 0) {
+        scsi_command_complete(r, SENSE_NO_SENSE);
+    }
+    len = r->sector_count * 512 + r->buf_len;
+    if (is_write) {
+        return -len;
+    } else {
+        if (!r->sector_count)
+            r->sector_count = -1;
+        return len;
+    }
+}
+
+static void scsi_destroy(SCSIDevice *d)
+{
+    qemu_free(d->state);
+    qemu_free(d);
+}
+
+SCSIDevice *scsi_disk_init(BlockDriverState *bdrv, int tcq,
+                           scsi_completionfn completion, void *opaque)
+{
+    SCSIDevice *d;
+    SCSIDeviceState *s;
+
+    s = (SCSIDeviceState *)qemu_mallocz(sizeof(SCSIDeviceState));
+    s->bdrv = bdrv;
+    s->tcq = tcq;
+    s->completion = completion;
+    s->opaque = opaque;
+    if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
+        s->cluster_size = 4;
+    } else {
+        s->cluster_size = 1;
+    }
+
+    d = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
+    d->state = s;
+    d->destroy = scsi_destroy;
+    d->send_command = scsi_send_command;
+    d->read_data = scsi_read_data;
+    d->write_data = scsi_write_data;
+    d->cancel_io = scsi_cancel_io;
+    d->get_buf = scsi_get_buf;
+
+    return d;
+}