Merge branch 'for-anthony' of git://repo.or.cz/qemu/kevin

* 'for-anthony' of git://repo.or.cz/qemu/kevin:
  Remove obsolete 'enabled' variable from progress state
  Add dd-style SIGUSR1 progress reporting
  qed: Fix consistency check on 32-bit hosts
  ide/atapi: Introduce CHECK_READY flag for commands
  ide/atapi: Replace bdrv_get_geometry calls by s->nb_sectors
  ide/atapi: Use table instead of switch for commands
  ide/atapi: Factor commands out
  ide: Split atapi.c out
  Improve accuracy of block migration bandwidth calculation
  atapi: Add 'medium ready' to 'medium not ready' transition on cd change
  qemu-img: allow rebase to a NULL backing file when unsafe

1 files changed, 1134 insertions, 0 deletions

diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c
new file mode 100644
index 0000000000..690a0abdda
--- /dev/null
+++ b/hw/ide/atapi.c
@@ -0,0 +1,1134 @@
+/*
+ * QEMU ATAPI Emulation
+ *
+ * Copyright (c) 2003 Fabrice Bellard
+ * Copyright (c) 2006 Openedhand Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "hw/ide/internal.h"
+#include "hw/scsi.h"
+
+static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret);
+
+static void padstr8(uint8_t *buf, int buf_size, const char *src)
+{
+    int i;
+    for(i = 0; i < buf_size; i++) {
+        if (*src)
+            buf[i] = *src++;
+        else
+            buf[i] = ' ';
+    }
+}
+
+static inline void cpu_to_ube16(uint8_t *buf, int val)
+{
+    buf[0] = val >> 8;
+    buf[1] = val & 0xff;
+}
+
+static inline void cpu_to_ube32(uint8_t *buf, unsigned int val)
+{
+    buf[0] = val >> 24;
+    buf[1] = val >> 16;
+    buf[2] = val >> 8;
+    buf[3] = val & 0xff;
+}
+
+static inline int ube16_to_cpu(const uint8_t *buf)
+{
+    return (buf[0] << 8) | buf[1];
+}
+
+static inline int ube32_to_cpu(const uint8_t *buf)
+{
+    return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
+}
+
+static void lba_to_msf(uint8_t *buf, int lba)
+{
+    lba += 150;
+    buf[0] = (lba / 75) / 60;
+    buf[1] = (lba / 75) % 60;
+    buf[2] = lba % 75;
+}
+
+/* XXX: DVDs that could fit on a CD will be reported as a CD */
+static inline int media_present(IDEState *s)
+{
+    return (s->nb_sectors > 0);
+}
+
+static inline int media_is_dvd(IDEState *s)
+{
+    return (media_present(s) && s->nb_sectors > CD_MAX_SECTORS);
+}
+
+static inline int media_is_cd(IDEState *s)
+{
+    return (media_present(s) && s->nb_sectors <= CD_MAX_SECTORS);
+}
+
+static void cd_data_to_raw(uint8_t *buf, int lba)
+{
+    /* sync bytes */
+    buf[0] = 0x00;
+    memset(buf + 1, 0xff, 10);
+    buf[11] = 0x00;
+    buf += 12;
+    /* MSF */
+    lba_to_msf(buf, lba);
+    buf[3] = 0x01; /* mode 1 data */
+    buf += 4;
+    /* data */
+    buf += 2048;
+    /* XXX: ECC not computed */
+    memset(buf, 0, 288);
+}
+
+static int cd_read_sector(BlockDriverState *bs, int lba, uint8_t *buf,
+                           int sector_size)
+{
+    int ret;
+
+    switch(sector_size) {
+    case 2048:
+        ret = bdrv_read(bs, (int64_t)lba << 2, buf, 4);
+        break;
+    case 2352:
+        ret = bdrv_read(bs, (int64_t)lba << 2, buf + 16, 4);
+        if (ret < 0)
+            return ret;
+        cd_data_to_raw(buf, lba);
+        break;
+    default:
+        ret = -EIO;
+        break;
+    }
+    return ret;
+}
+
+void ide_atapi_cmd_ok(IDEState *s)
+{
+    s->error = 0;
+    s->status = READY_STAT | SEEK_STAT;
+    s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
+    ide_set_irq(s->bus);
+}
+
+void ide_atapi_cmd_error(IDEState *s, int sense_key, int asc)
+{
+#ifdef DEBUG_IDE_ATAPI
+    printf("atapi_cmd_error: sense=0x%x asc=0x%x\n", sense_key, asc);
+#endif
+    s->error = sense_key << 4;
+    s->status = READY_STAT | ERR_STAT;
+    s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
+    s->sense_key = sense_key;
+    s->asc = asc;
+    ide_set_irq(s->bus);
+}
+
+void ide_atapi_io_error(IDEState *s, int ret)
+{
+    /* XXX: handle more errors */
+    if (ret == -ENOMEDIUM) {
+        ide_atapi_cmd_error(s, SENSE_NOT_READY,
+                            ASC_MEDIUM_NOT_PRESENT);
+    } else {
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                            ASC_LOGICAL_BLOCK_OOR);
+    }
+}
+
+/* The whole ATAPI transfer logic is handled in this function */
+void ide_atapi_cmd_reply_end(IDEState *s)
+{
+    int byte_count_limit, size, ret;
+#ifdef DEBUG_IDE_ATAPI
+    printf("reply: tx_size=%d elem_tx_size=%d index=%d\n",
+           s->packet_transfer_size,
+           s->elementary_transfer_size,
+           s->io_buffer_index);
+#endif
+    if (s->packet_transfer_size <= 0) {
+        /* end of transfer */
+        ide_transfer_stop(s);
+        s->status = READY_STAT | SEEK_STAT;
+        s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
+        ide_set_irq(s->bus);
+#ifdef DEBUG_IDE_ATAPI
+        printf("status=0x%x\n", s->status);
+#endif
+    } else {
+        /* see if a new sector must be read */
+        if (s->lba != -1 && s->io_buffer_index >= s->cd_sector_size) {
+            ret = cd_read_sector(s->bs, s->lba, s->io_buffer, s->cd_sector_size);
+            if (ret < 0) {
+                ide_transfer_stop(s);
+                ide_atapi_io_error(s, ret);
+                return;
+            }
+            s->lba++;
+            s->io_buffer_index = 0;
+        }
+        if (s->elementary_transfer_size > 0) {
+            /* there are some data left to transmit in this elementary
+               transfer */
+            size = s->cd_sector_size - s->io_buffer_index;
+            if (size > s->elementary_transfer_size)
+                size = s->elementary_transfer_size;
+            s->packet_transfer_size -= size;
+            s->elementary_transfer_size -= size;
+            s->io_buffer_index += size;
+            ide_transfer_start(s, s->io_buffer + s->io_buffer_index - size,
+                               size, ide_atapi_cmd_reply_end);
+        } else {
+            /* a new transfer is needed */
+            s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO;
+            byte_count_limit = s->lcyl | (s->hcyl << 8);
+#ifdef DEBUG_IDE_ATAPI
+            printf("byte_count_limit=%d\n", byte_count_limit);
+#endif
+            if (byte_count_limit == 0xffff)
+                byte_count_limit--;
+            size = s->packet_transfer_size;
+            if (size > byte_count_limit) {
+                /* byte count limit must be even if this case */
+                if (byte_count_limit & 1)
+                    byte_count_limit--;
+                size = byte_count_limit;
+            }
+            s->lcyl = size;
+            s->hcyl = size >> 8;
+            s->elementary_transfer_size = size;
+            /* we cannot transmit more than one sector at a time */
+            if (s->lba != -1) {
+                if (size > (s->cd_sector_size - s->io_buffer_index))
+                    size = (s->cd_sector_size - s->io_buffer_index);
+            }
+            s->packet_transfer_size -= size;
+            s->elementary_transfer_size -= size;
+            s->io_buffer_index += size;
+            ide_transfer_start(s, s->io_buffer + s->io_buffer_index - size,
+                               size, ide_atapi_cmd_reply_end);
+            ide_set_irq(s->bus);
+#ifdef DEBUG_IDE_ATAPI
+            printf("status=0x%x\n", s->status);
+#endif
+        }
+    }
+}
+
+/* send a reply of 'size' bytes in s->io_buffer to an ATAPI command */
+static void ide_atapi_cmd_reply(IDEState *s, int size, int max_size)
+{
+    if (size > max_size)
+        size = max_size;
+    s->lba = -1; /* no sector read */
+    s->packet_transfer_size = size;
+    s->io_buffer_size = size;    /* dma: send the reply data as one chunk */
+    s->elementary_transfer_size = 0;
+    s->io_buffer_index = 0;
+
+    if (s->atapi_dma) {
+        s->status = READY_STAT | SEEK_STAT | DRQ_STAT;
+        s->bus->dma->ops->start_dma(s->bus->dma, s,
+                                   ide_atapi_cmd_read_dma_cb);
+    } else {
+        s->status = READY_STAT | SEEK_STAT;
+        ide_atapi_cmd_reply_end(s);
+    }
+}
+
+/* start a CD-CDROM read command */
+static void ide_atapi_cmd_read_pio(IDEState *s, int lba, int nb_sectors,
+                                   int sector_size)
+{
+    s->lba = lba;
+    s->packet_transfer_size = nb_sectors * sector_size;
+    s->elementary_transfer_size = 0;
+    s->io_buffer_index = sector_size;
+    s->cd_sector_size = sector_size;
+
+    s->status = READY_STAT | SEEK_STAT;
+    ide_atapi_cmd_reply_end(s);
+}
+
+static void ide_atapi_cmd_check_status(IDEState *s)
+{
+#ifdef DEBUG_IDE_ATAPI
+    printf("atapi_cmd_check_status\n");
+#endif
+    s->error = MC_ERR | (SENSE_UNIT_ATTENTION << 4);
+    s->status = ERR_STAT;
+    s->nsector = 0;
+    ide_set_irq(s->bus);
+}
+/* ATAPI DMA support */
+
+/* XXX: handle read errors */
+static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret)
+{
+    IDEState *s = opaque;
+    int data_offset, n;
+
+    if (ret < 0) {
+        ide_atapi_io_error(s, ret);
+        goto eot;
+    }
+
+    if (s->io_buffer_size > 0) {
+        /*
+         * For a cdrom read sector command (s->lba != -1),
+         * adjust the lba for the next s->io_buffer_size chunk
+         * and dma the current chunk.
+         * For a command != read (s->lba == -1), just transfer
+         * the reply data.
+         */
+        if (s->lba != -1) {
+            if (s->cd_sector_size == 2352) {
+                n = 1;
+                cd_data_to_raw(s->io_buffer, s->lba);
+            } else {
+                n = s->io_buffer_size >> 11;
+            }
+            s->lba += n;
+        }
+        s->packet_transfer_size -= s->io_buffer_size;
+        if (s->bus->dma->ops->rw_buf(s->bus->dma, 1) == 0)
+            goto eot;
+    }
+
+    if (s->packet_transfer_size <= 0) {
+        s->status = READY_STAT | SEEK_STAT;
+        s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
+        ide_set_irq(s->bus);
+    eot:
+        s->bus->dma->ops->add_status(s->bus->dma, BM_STATUS_INT);
+        ide_set_inactive(s);
+        return;
+    }
+
+    s->io_buffer_index = 0;
+    if (s->cd_sector_size == 2352) {
+        n = 1;
+        s->io_buffer_size = s->cd_sector_size;
+        data_offset = 16;
+    } else {
+        n = s->packet_transfer_size >> 11;
+        if (n > (IDE_DMA_BUF_SECTORS / 4))
+            n = (IDE_DMA_BUF_SECTORS / 4);
+        s->io_buffer_size = n * 2048;
+        data_offset = 0;
+    }
+#ifdef DEBUG_AIO
+    printf("aio_read_cd: lba=%u n=%d\n", s->lba, n);
+#endif
+    s->bus->dma->iov.iov_base = (void *)(s->io_buffer + data_offset);
+    s->bus->dma->iov.iov_len = n * 4 * 512;
+    qemu_iovec_init_external(&s->bus->dma->qiov, &s->bus->dma->iov, 1);
+    s->bus->dma->aiocb = bdrv_aio_readv(s->bs, (int64_t)s->lba << 2,
+                                       &s->bus->dma->qiov, n * 4,
+                                       ide_atapi_cmd_read_dma_cb, s);
+    if (!s->bus->dma->aiocb) {
+        /* Note: media not present is the most likely case */
+        ide_atapi_cmd_error(s, SENSE_NOT_READY,
+                            ASC_MEDIUM_NOT_PRESENT);
+        goto eot;
+    }
+}
+
+/* start a CD-CDROM read command with DMA */
+/* XXX: test if DMA is available */
+static void ide_atapi_cmd_read_dma(IDEState *s, int lba, int nb_sectors,
+                                   int sector_size)
+{
+    s->lba = lba;
+    s->packet_transfer_size = nb_sectors * sector_size;
+    s->io_buffer_index = 0;
+    s->io_buffer_size = 0;
+    s->cd_sector_size = sector_size;
+
+    /* XXX: check if BUSY_STAT should be set */
+    s->status = READY_STAT | SEEK_STAT | DRQ_STAT | BUSY_STAT;
+    s->bus->dma->ops->start_dma(s->bus->dma, s,
+                               ide_atapi_cmd_read_dma_cb);
+}
+
+static void ide_atapi_cmd_read(IDEState *s, int lba, int nb_sectors,
+                               int sector_size)
+{
+#ifdef DEBUG_IDE_ATAPI
+    printf("read %s: LBA=%d nb_sectors=%d\n", s->atapi_dma ? "dma" : "pio",
+        lba, nb_sectors);
+#endif
+    if (s->atapi_dma) {
+        ide_atapi_cmd_read_dma(s, lba, nb_sectors, sector_size);
+    } else {
+        ide_atapi_cmd_read_pio(s, lba, nb_sectors, sector_size);
+    }
+}
+
+static inline uint8_t ide_atapi_set_profile(uint8_t *buf, uint8_t *index,
+                                            uint16_t profile)
+{
+    uint8_t *buf_profile = buf + 12; /* start of profiles */
+
+    buf_profile += ((*index) * 4); /* start of indexed profile */
+    cpu_to_ube16 (buf_profile, profile);
+    buf_profile[2] = ((buf_profile[0] == buf[6]) && (buf_profile[1] == buf[7]));
+
+    /* each profile adds 4 bytes to the response */
+    (*index)++;
+    buf[11] += 4; /* Additional Length */
+
+    return 4;
+}
+
+static int ide_dvd_read_structure(IDEState *s, int format,
+                                  const uint8_t *packet, uint8_t *buf)
+{
+    switch (format) {
+        case 0x0: /* Physical format information */
+            {
+                int layer = packet[6];
+                uint64_t total_sectors;
+
+                if (layer != 0)
+                    return -ASC_INV_FIELD_IN_CMD_PACKET;
+
+                total_sectors = s->nb_sectors >> 2;
+                if (total_sectors == 0) {
+                    return -ASC_MEDIUM_NOT_PRESENT;
+                }
+
+                buf[4] = 1;   /* DVD-ROM, part version 1 */
+                buf[5] = 0xf; /* 120mm disc, minimum rate unspecified */
+                buf[6] = 1;   /* one layer, read-only (per MMC-2 spec) */
+                buf[7] = 0;   /* default densities */
+
+                /* FIXME: 0x30000 per spec? */
+                cpu_to_ube32(buf + 8, 0); /* start sector */
+                cpu_to_ube32(buf + 12, total_sectors - 1); /* end sector */
+                cpu_to_ube32(buf + 16, total_sectors - 1); /* l0 end sector */
+
+                /* Size of buffer, not including 2 byte size field */
+                cpu_to_be16wu((uint16_t *)buf, 2048 + 2);
+
+                /* 2k data + 4 byte header */
+                return (2048 + 4);
+            }
+
+        case 0x01: /* DVD copyright information */
+            buf[4] = 0; /* no copyright data */
+            buf[5] = 0; /* no region restrictions */
+
+            /* Size of buffer, not including 2 byte size field */
+            cpu_to_be16wu((uint16_t *)buf, 4 + 2);
+
+            /* 4 byte header + 4 byte data */
+            return (4 + 4);
+
+        case 0x03: /* BCA information - invalid field for no BCA info */
+            return -ASC_INV_FIELD_IN_CMD_PACKET;
+
+        case 0x04: /* DVD disc manufacturing information */
+            /* Size of buffer, not including 2 byte size field */
+            cpu_to_be16wu((uint16_t *)buf, 2048 + 2);
+
+            /* 2k data + 4 byte header */
+            return (2048 + 4);
+
+        case 0xff:
+            /*
+             * This lists all the command capabilities above.  Add new ones
+             * in order and update the length and buffer return values.
+             */
+
+            buf[4] = 0x00; /* Physical format */
+            buf[5] = 0x40; /* Not writable, is readable */
+            cpu_to_be16wu((uint16_t *)(buf + 6), 2048 + 4);
+
+            buf[8] = 0x01; /* Copyright info */
+            buf[9] = 0x40; /* Not writable, is readable */
+            cpu_to_be16wu((uint16_t *)(buf + 10), 4 + 4);
+
+            buf[12] = 0x03; /* BCA info */
+            buf[13] = 0x40; /* Not writable, is readable */
+            cpu_to_be16wu((uint16_t *)(buf + 14), 188 + 4);
+
+            buf[16] = 0x04; /* Manufacturing info */
+            buf[17] = 0x40; /* Not writable, is readable */
+            cpu_to_be16wu((uint16_t *)(buf + 18), 2048 + 4);
+
+            /* Size of buffer, not including 2 byte size field */
+            cpu_to_be16wu((uint16_t *)buf, 16 + 2);
+
+            /* data written + 4 byte header */
+            return (16 + 4);
+
+        default: /* TODO: formats beyond DVD-ROM requires */
+            return -ASC_INV_FIELD_IN_CMD_PACKET;
+    }
+}
+
+static unsigned int event_status_media(IDEState *s,
+                                       uint8_t *buf)
+{
+    enum media_event_code {
+        MEC_NO_CHANGE = 0,       /* Status unchanged */
+        MEC_EJECT_REQUESTED,     /* received a request from user to eject */
+        MEC_NEW_MEDIA,           /* new media inserted and ready for access */
+        MEC_MEDIA_REMOVAL,       /* only for media changers */
+        MEC_MEDIA_CHANGED,       /* only for media changers */
+        MEC_BG_FORMAT_COMPLETED, /* MRW or DVD+RW b/g format completed */
+        MEC_BG_FORMAT_RESTARTED, /* MRW or DVD+RW b/g format restarted */
+    };
+    enum media_status {
+        MS_TRAY_OPEN = 1,
+        MS_MEDIA_PRESENT = 2,
+    };
+    uint8_t event_code, media_status;
+
+    media_status = 0;
+    if (s->bs->tray_open) {
+        media_status = MS_TRAY_OPEN;
+    } else if (bdrv_is_inserted(s->bs)) {
+        media_status = MS_MEDIA_PRESENT;
+    }
+
+    /* Event notification descriptor */
+    event_code = MEC_NO_CHANGE;
+    if (media_status != MS_TRAY_OPEN && s->events.new_media) {
+        event_code = MEC_NEW_MEDIA;
+        s->events.new_media = false;
+    }
+
+    buf[4] = event_code;
+    buf[5] = media_status;
+
+    /* These fields are reserved, just clear them. */
+    buf[6] = 0;
+    buf[7] = 0;
+
+    return 8; /* We wrote to 4 extra bytes from the header */
+}
+
+static void cmd_get_event_status_notification(IDEState *s,
+                                              uint8_t *buf)
+{
+    const uint8_t *packet = buf;
+
+    struct {
+        uint8_t opcode;
+        uint8_t polled;        /* lsb bit is polled; others are reserved */
+        uint8_t reserved2[2];
+        uint8_t class;
+        uint8_t reserved3[2];
+        uint16_t len;
+        uint8_t control;
+    } __attribute__((packed)) *gesn_cdb;
+
+    struct {
+        uint16_t len;
+        uint8_t notification_class;
+        uint8_t supported_events;
+    } __attribute((packed)) *gesn_event_header;
+
+    enum notification_class_request_type {
+        NCR_RESERVED1 = 1 << 0,
+        NCR_OPERATIONAL_CHANGE = 1 << 1,
+        NCR_POWER_MANAGEMENT = 1 << 2,
+        NCR_EXTERNAL_REQUEST = 1 << 3,
+        NCR_MEDIA = 1 << 4,
+        NCR_MULTI_HOST = 1 << 5,
+        NCR_DEVICE_BUSY = 1 << 6,
+        NCR_RESERVED2 = 1 << 7,
+    };
+    enum event_notification_class_field {
+        ENC_NO_EVENTS = 0,
+        ENC_OPERATIONAL_CHANGE,
+        ENC_POWER_MANAGEMENT,
+        ENC_EXTERNAL_REQUEST,
+        ENC_MEDIA,
+        ENC_MULTIPLE_HOSTS,
+        ENC_DEVICE_BUSY,
+        ENC_RESERVED,
+    };
+    unsigned int max_len, used_len;
+
+    gesn_cdb = (void *)packet;
+    gesn_event_header = (void *)buf;
+
+    max_len = be16_to_cpu(gesn_cdb->len);
+
+    /* It is fine by the MMC spec to not support async mode operations */
+    if (!(gesn_cdb->polled & 0x01)) { /* asynchronous mode */
+        /* Only polling is supported, asynchronous mode is not. */
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                            ASC_INV_FIELD_IN_CMD_PACKET);
+        return;
+    }
+
+    /* polling mode operation */
+
+    /*
+     * These are the supported events.
+     *
+     * We currently only support requests of the 'media' type.
+     */
+    gesn_event_header->supported_events = NCR_MEDIA;
+
+    /*
+     * We use |= below to set the class field; other bits in this byte
+     * are reserved now but this is useful to do if we have to use the
+     * reserved fields later.
+     */
+    gesn_event_header->notification_class = 0;
+
+    /*
+     * Responses to requests are to be based on request priority.  The
+     * notification_class_request_type enum above specifies the
+     * priority: upper elements are higher prio than lower ones.
+     */
+    if (gesn_cdb->class & NCR_MEDIA) {
+        gesn_event_header->notification_class |= ENC_MEDIA;
+        used_len = event_status_media(s, buf);
+    } else {
+        gesn_event_header->notification_class = 0x80; /* No event available */
+        used_len = sizeof(*gesn_event_header);
+    }
+    gesn_event_header->len = cpu_to_be16(used_len
+                                         - sizeof(*gesn_event_header));
+    ide_atapi_cmd_reply(s, used_len, max_len);
+}
+
+static void cmd_request_sense(IDEState *s, uint8_t *buf)
+{
+    int max_len = buf[4];
+
+    memset(buf, 0, 18);
+    buf[0] = 0x70 | (1 << 7);
+    buf[2] = s->sense_key;
+    buf[7] = 10;
+    buf[12] = s->asc;
+
+    if (s->sense_key == SENSE_UNIT_ATTENTION) {
+        s->sense_key = SENSE_NONE;
+    }
+
+    ide_atapi_cmd_reply(s, 18, max_len);
+}
+
+static void cmd_inquiry(IDEState *s, uint8_t *buf)
+{
+    int max_len = buf[4];
+
+    buf[0] = 0x05; /* CD-ROM */
+    buf[1] = 0x80; /* removable */
+    buf[2] = 0x00; /* ISO */
+    buf[3] = 0x21; /* ATAPI-2 (XXX: put ATAPI-4 ?) */
+    buf[4] = 31; /* additional length */
+    buf[5] = 0; /* reserved */
+    buf[6] = 0; /* reserved */
+    buf[7] = 0; /* reserved */
+    padstr8(buf + 8, 8, "QEMU");
+    padstr8(buf + 16, 16, "QEMU DVD-ROM");
+    padstr8(buf + 32, 4, s->version);
+    ide_atapi_cmd_reply(s, 36, max_len);
+}
+
+static void cmd_get_configuration(IDEState *s, uint8_t *buf)
+{
+    uint32_t len;
+    uint8_t index = 0;
+    int max_len;
+
+    /* only feature 0 is supported */
+    if (buf[2] != 0 || buf[3] != 0) {
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                            ASC_INV_FIELD_IN_CMD_PACKET);
+        return;
+    }
+
+    /* XXX: could result in alignment problems in some architectures */
+    max_len = ube16_to_cpu(buf + 7);
+
+    /*
+     * XXX: avoid overflow for io_buffer if max_len is bigger than
+     *      the size of that buffer (dimensioned to max number of
+     *      sectors to transfer at once)
+     *
+     *      Only a problem if the feature/profiles grow.
+     */
+    if (max_len > 512) {
+        /* XXX: assume 1 sector */
+        max_len = 512;
+    }
+
+    memset(buf, 0, max_len);
+    /*
+     * the number of sectors from the media tells us which profile
+     * to use as current.  0 means there is no media
+     */
+    if (media_is_dvd(s)) {
+        cpu_to_ube16(buf + 6, MMC_PROFILE_DVD_ROM);
+    } else if (media_is_cd(s)) {
+        cpu_to_ube16(buf + 6, MMC_PROFILE_CD_ROM);
+    }
+
+    buf[10] = 0x02 | 0x01; /* persistent and current */
+    len = 12; /* headers: 8 + 4 */
+    len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_DVD_ROM);
+    len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_CD_ROM);
+    cpu_to_ube32(buf, len - 4); /* data length */
+
+    ide_atapi_cmd_reply(s, len, max_len);
+}
+
+static void cmd_mode_sense(IDEState *s, uint8_t *buf)
+{
+    int action, code;
+    int max_len;
+
+    if (buf[0] == GPCMD_MODE_SENSE_10) {
+        max_len = ube16_to_cpu(buf + 7);
+    } else {
+        max_len = buf[4];
+    }
+
+    action = buf[2] >> 6;
+    code = buf[2] & 0x3f;
+
+    switch(action) {
+    case 0: /* current values */
+        switch(code) {
+        case GPMODE_R_W_ERROR_PAGE: /* error recovery */
+            cpu_to_ube16(&buf[0], 16 + 6);
+            buf[2] = 0x70;
+            buf[3] = 0;
+            buf[4] = 0;
+            buf[5] = 0;
+            buf[6] = 0;
+            buf[7] = 0;
+
+            buf[8] = 0x01;
+            buf[9] = 0x06;
+            buf[10] = 0x00;
+            buf[11] = 0x05;
+            buf[12] = 0x00;
+            buf[13] = 0x00;
+            buf[14] = 0x00;
+            buf[15] = 0x00;
+            ide_atapi_cmd_reply(s, 16, max_len);
+            break;
+        case GPMODE_AUDIO_CTL_PAGE:
+            cpu_to_ube16(&buf[0], 24 + 6);
+            buf[2] = 0x70;
+            buf[3] = 0;
+            buf[4] = 0;
+            buf[5] = 0;
+            buf[6] = 0;
+            buf[7] = 0;
+
+            /* Fill with CDROM audio volume */
+            buf[17] = 0;
+            buf[19] = 0;
+            buf[21] = 0;
+            buf[23] = 0;
+
+            ide_atapi_cmd_reply(s, 24, max_len);
+            break;
+        case GPMODE_CAPABILITIES_PAGE:
+            cpu_to_ube16(&buf[0], 28 + 6);
+            buf[2] = 0x70;
+            buf[3] = 0;
+            buf[4] = 0;
+            buf[5] = 0;
+            buf[6] = 0;
+            buf[7] = 0;
+
+            buf[8] = 0x2a;
+            buf[9] = 0x12;
+            buf[10] = 0x00;
+            buf[11] = 0x00;
+
+            /* Claim PLAY_AUDIO capability (0x01) since some Linux
+               code checks for this to automount media. */
+            buf[12] = 0x71;
+            buf[13] = 3 << 5;
+            buf[14] = (1 << 0) | (1 << 3) | (1 << 5);
+            if (bdrv_is_locked(s->bs))
+                buf[6] |= 1 << 1;
+            buf[15] = 0x00;
+            cpu_to_ube16(&buf[16], 706);
+            buf[18] = 0;
+            buf[19] = 2;
+            cpu_to_ube16(&buf[20], 512);
+            cpu_to_ube16(&buf[22], 706);
+            buf[24] = 0;
+            buf[25] = 0;
+            buf[26] = 0;
+            buf[27] = 0;
+            ide_atapi_cmd_reply(s, 28, max_len);
+            break;
+        default:
+            goto error_cmd;
+        }
+        break;
+    case 1: /* changeable values */
+        goto error_cmd;
+    case 2: /* default values */
+        goto error_cmd;
+    default:
+    case 3: /* saved values */
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                            ASC_SAVING_PARAMETERS_NOT_SUPPORTED);
+        break;
+    }
+    return;
+
+error_cmd:
+    ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST, ASC_INV_FIELD_IN_CMD_PACKET);
+}
+
+static void cmd_test_unit_ready(IDEState *s, uint8_t *buf)
+{
+    /* Not Ready Conditions are already handled in ide_atapi_cmd(), so if we
+     * come here, we know that it's ready. */
+    ide_atapi_cmd_ok(s);
+}
+
+static void cmd_prevent_allow_medium_removal(IDEState *s, uint8_t* buf)
+{
+    bdrv_set_locked(s->bs, buf[4] & 1);
+    ide_atapi_cmd_ok(s);
+}
+
+static void cmd_read(IDEState *s, uint8_t* buf)
+{
+    int nb_sectors, lba;
+
+    if (buf[0] == GPCMD_READ_10) {
+        nb_sectors = ube16_to_cpu(buf + 7);
+    } else {
+        nb_sectors = ube32_to_cpu(buf + 6);
+    }
+
+    lba = ube32_to_cpu(buf + 2);
+    if (nb_sectors == 0) {
+        ide_atapi_cmd_ok(s);
+        return;
+    }
+
+    ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
+}
+
+static void cmd_read_cd(IDEState *s, uint8_t* buf)
+{
+    int nb_sectors, lba, transfer_request;
+
+    nb_sectors = (buf[6] << 16) | (buf[7] << 8) | buf[8];
+    lba = ube32_to_cpu(buf + 2);
+
+    if (nb_sectors == 0) {
+        ide_atapi_cmd_ok(s);
+        return;
+    }
+
+    transfer_request = buf[9];
+    switch(transfer_request & 0xf8) {
+    case 0x00:
+        /* nothing */
+        ide_atapi_cmd_ok(s);
+        break;
+    case 0x10:
+        /* normal read */
+        ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
+        break;
+    case 0xf8:
+        /* read all data */
+        ide_atapi_cmd_read(s, lba, nb_sectors, 2352);
+        break;
+    default:
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                            ASC_INV_FIELD_IN_CMD_PACKET);
+        break;
+    }
+}
+
+static void cmd_seek(IDEState *s, uint8_t* buf)
+{
+    unsigned int lba;
+    uint64_t total_sectors = s->nb_sectors >> 2;
+
+    lba = ube32_to_cpu(buf + 2);
+    if (lba >= total_sectors) {
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST, ASC_LOGICAL_BLOCK_OOR);
+        return;
+    }
+
+    ide_atapi_cmd_ok(s);
+}
+
+static void cmd_start_stop_unit(IDEState *s, uint8_t* buf)
+{
+    int start, eject, sense, err = 0;
+    start = buf[4] & 1;
+    eject = (buf[4] >> 1) & 1;
+
+    if (eject) {
+        err = bdrv_eject(s->bs, !start);
+    }
+
+    switch (err) {
+    case 0:
+        ide_atapi_cmd_ok(s);
+        break;
+    case -EBUSY:
+        sense = SENSE_NOT_READY;
+        if (bdrv_is_inserted(s->bs)) {
+            sense = SENSE_ILLEGAL_REQUEST;
+        }
+        ide_atapi_cmd_error(s, sense, ASC_MEDIA_REMOVAL_PREVENTED);
+        break;
+    default:
+        ide_atapi_cmd_error(s, SENSE_NOT_READY, ASC_MEDIUM_NOT_PRESENT);
+        break;
+    }
+}
+
+static void cmd_mechanism_status(IDEState *s, uint8_t* buf)
+{
+    int max_len = ube16_to_cpu(buf + 8);
+
+    cpu_to_ube16(buf, 0);
+    /* no current LBA */
+    buf[2] = 0;
+    buf[3] = 0;
+    buf[4] = 0;
+    buf[5] = 1;
+    cpu_to_ube16(buf + 6, 0);
+    ide_atapi_cmd_reply(s, 8, max_len);
+}
+
+static void cmd_read_toc_pma_atip(IDEState *s, uint8_t* buf)
+{
+    int format, msf, start_track, len;
+    int max_len;
+    uint64_t total_sectors = s->nb_sectors >> 2;
+
+    max_len = ube16_to_cpu(buf + 7);
+    format = buf[9] >> 6;
+    msf = (buf[1] >> 1) & 1;
+    start_track = buf[6];
+
+    switch(format) {
+    case 0:
+        len = cdrom_read_toc(total_sectors, buf, msf, start_track);
+        if (len < 0)
+            goto error_cmd;
+        ide_atapi_cmd_reply(s, len, max_len);
+        break;
+    case 1:
+        /* multi session : only a single session defined */
+        memset(buf, 0, 12);
+        buf[1] = 0x0a;
+        buf[2] = 0x01;
+        buf[3] = 0x01;
+        ide_atapi_cmd_reply(s, 12, max_len);
+        break;
+    case 2:
+        len = cdrom_read_toc_raw(total_sectors, buf, msf, start_track);
+        if (len < 0)
+            goto error_cmd;
+        ide_atapi_cmd_reply(s, len, max_len);
+        break;
+    default:
+    error_cmd:
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                            ASC_INV_FIELD_IN_CMD_PACKET);
+    }
+}
+
+static void cmd_read_cdvd_capacity(IDEState *s, uint8_t* buf)
+{
+    uint64_t total_sectors = s->nb_sectors >> 2;
+
+    /* NOTE: it is really the number of sectors minus 1 */
+    cpu_to_ube32(buf, total_sectors - 1);
+    cpu_to_ube32(buf + 4, 2048);
+    ide_atapi_cmd_reply(s, 8, 8);
+}
+
+static void cmd_read_dvd_structure(IDEState *s, uint8_t* buf)
+{
+    int max_len;
+    int media = buf[1];
+    int format = buf[7];
+    int ret;
+
+    max_len = ube16_to_cpu(buf + 8);
+
+    if (format < 0xff) {
+        if (media_is_cd(s)) {
+            ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                                ASC_INCOMPATIBLE_FORMAT);
+            return;
+        } else if (!media_present(s)) {
+            ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                                ASC_INV_FIELD_IN_CMD_PACKET);
+            return;
+        }
+    }
+
+    memset(buf, 0, max_len > IDE_DMA_BUF_SECTORS * 512 + 4 ?
+           IDE_DMA_BUF_SECTORS * 512 + 4 : max_len);
+
+    switch (format) {
+        case 0x00 ... 0x7f:
+        case 0xff:
+            if (media == 0) {
+                ret = ide_dvd_read_structure(s, format, buf, buf);
+
+                if (ret < 0) {
+                    ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST, -ret);
+                } else {
+                    ide_atapi_cmd_reply(s, ret, max_len);
+                }
+
+                break;
+            }
+            /* TODO: BD support, fall through for now */
+
+        /* Generic disk structures */
+        case 0x80: /* TODO: AACS volume identifier */
+        case 0x81: /* TODO: AACS media serial number */
+        case 0x82: /* TODO: AACS media identifier */
+        case 0x83: /* TODO: AACS media key block */
+        case 0x90: /* TODO: List of recognized format layers */
+        case 0xc0: /* TODO: Write protection status */
+        default:
+            ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
+                                ASC_INV_FIELD_IN_CMD_PACKET);
+            break;
+    }
+}
+
+static void cmd_set_speed(IDEState *s, uint8_t* buf)
+{
+    ide_atapi_cmd_ok(s);
+}
+
+enum {
+    /*
+     * Only commands flagged as ALLOW_UA are allowed to run under a
+     * unit attention condition. (See MMC-5, section 4.1.6.1)
+     */
+    ALLOW_UA = 0x01,
+
+    /*
+     * Commands flagged with CHECK_READY can only execute if a medium is present.
+     * Otherwise they report the Not Ready Condition. (See MMC-5, section
+     * 4.1.8)
+     */
+    CHECK_READY = 0x02,
+};
+
+static const struct {
+    void (*handler)(IDEState *s, uint8_t *buf);
+    int flags;
+} atapi_cmd_table[0x100] = {
+    [ 0x00 ] = { cmd_test_unit_ready,               CHECK_READY },
+    [ 0x03 ] = { cmd_request_sense,                 ALLOW_UA },
+    [ 0x12 ] = { cmd_inquiry,                       ALLOW_UA },
+    [ 0x1a ] = { cmd_mode_sense, /* (6) */          0 },
+    [ 0x1b ] = { cmd_start_stop_unit,               0 },
+    [ 0x1e ] = { cmd_prevent_allow_medium_removal,  0 },
+    [ 0x25 ] = { cmd_read_cdvd_capacity,            CHECK_READY },
+    [ 0x28 ] = { cmd_read, /* (10) */               0 },
+    [ 0x2b ] = { cmd_seek,                          CHECK_READY },
+    [ 0x43 ] = { cmd_read_toc_pma_atip,             CHECK_READY },
+    [ 0x46 ] = { cmd_get_configuration,             ALLOW_UA },
+    [ 0x4a ] = { cmd_get_event_status_notification, ALLOW_UA },
+    [ 0x5a ] = { cmd_mode_sense, /* (10) */         0 },
+    [ 0xa8 ] = { cmd_read, /* (12) */               0 },
+    [ 0xad ] = { cmd_read_dvd_structure,            0 },
+    [ 0xbb ] = { cmd_set_speed,                     0 },
+    [ 0xbd ] = { cmd_mechanism_status,              0 },
+    [ 0xbe ] = { cmd_read_cd,                       0 },
+};
+
+void ide_atapi_cmd(IDEState *s)
+{
+    const uint8_t *packet;
+    uint8_t *buf;
+
+    packet = s->io_buffer;
+    buf = s->io_buffer;
+#ifdef DEBUG_IDE_ATAPI
+    {
+        int i;
+        printf("ATAPI limit=0x%x packet:", s->lcyl | (s->hcyl << 8));
+        for(i = 0; i < ATAPI_PACKET_SIZE; i++) {
+            printf(" %02x", packet[i]);
+        }
+        printf("\n");
+    }
+#endif
+    /*
+     * If there's a UNIT_ATTENTION condition pending, only command flagged with
+     * ALLOW_UA are allowed to complete. with other commands getting a CHECK
+     * condition response unless a higher priority status, defined by the drive
+     * here, is pending.
+     */
+    if (s->sense_key == SENSE_UNIT_ATTENTION &&
+        !(atapi_cmd_table[s->io_buffer[0]].flags & ALLOW_UA)) {
+        ide_atapi_cmd_check_status(s);
+        return;
+    }
+
+    if (bdrv_is_inserted(s->bs) && s->cdrom_changed) {
+        ide_atapi_cmd_error(s, SENSE_NOT_READY, ASC_MEDIUM_NOT_PRESENT);
+
+        s->cdrom_changed = 0;
+        s->sense_key = SENSE_UNIT_ATTENTION;
+        s->asc = ASC_MEDIUM_MAY_HAVE_CHANGED;
+        return;
+    }
+
+    /* Report a Not Ready condition if appropriate for the command */
+    if ((atapi_cmd_table[s->io_buffer[0]].flags & CHECK_READY) &&
+        (!media_present(s) || !bdrv_is_inserted(s->bs)))
+    {
+        ide_atapi_cmd_error(s, SENSE_NOT_READY, ASC_MEDIUM_NOT_PRESENT);
+        return;
+    }
+
+    /* Execute the command */
+    if (atapi_cmd_table[s->io_buffer[0]].handler) {
+        atapi_cmd_table[s->io_buffer[0]].handler(s, buf);
+        return;
+    }
+
+    ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST, ASC_ILLEGAL_OPCODE);
+}