core.c

/*
 * QEMU IDE disk and CD/DVD-ROM Emulator
 *
 * 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/hw.h>
#include <hw/pc.h>
#include <hw/pci.h>
#include <hw/scsi.h>
#include "qemu-error.h"
#include "qemu-timer.h"
#include "sysemu.h"
#include "dma.h"

#include <hw/ide/internal.h>

#define IDE_PAGE_SIZE 4096

static const int smart_attributes[][5] = {
    /* id,  flags, val, wrst, thrsh */
    { 0x01, 0x03, 0x64, 0x64, 0x06}, /* raw read */
    { 0x03, 0x03, 0x64, 0x64, 0x46}, /* spin up */
    { 0x04, 0x02, 0x64, 0x64, 0x14}, /* start stop count */
    { 0x05, 0x03, 0x64, 0x64, 0x36}, /* remapped sectors */
    { 0x00, 0x00, 0x00, 0x00, 0x00}
};

/* 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 ide_dma_start(IDEState *s, BlockDriverCompletionFunc *dma_cb);
static void ide_dma_restart(IDEState *s, int is_read);
static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret);
static int ide_handle_rw_error(IDEState *s, int error, int op);

static void padstr(char *str, const char *src, int len)
{
    int i, v;
    for(i = 0; i < len; i++) {
        if (*src)
            v = *src++;
        else
            v = ' ';
        str[i^1] = v;
    }
}

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 void put_le16(uint16_t *p, unsigned int v)
{
    *p = cpu_to_le16(v);
}

static void ide_identify(IDEState *s)
{
    uint16_t *p;
    unsigned int oldsize;
    IDEDevice *dev;

    if (s->identify_set) {
	memcpy(s->io_buffer, s->identify_data, sizeof(s->identify_data));
	return;
    }

    memset(s->io_buffer, 0, 512);
    p = (uint16_t *)s->io_buffer;
    put_le16(p + 0, 0x0040);
    put_le16(p + 1, s->cylinders);
    put_le16(p + 3, s->heads);
    put_le16(p + 4, 512 * s->sectors); /* XXX: retired, remove ? */
    put_le16(p + 5, 512); /* XXX: retired, remove ? */
    put_le16(p + 6, s->sectors);
    padstr((char *)(p + 10), s->drive_serial_str, 20); /* serial number */
    put_le16(p + 20, 3); /* XXX: retired, remove ? */
    put_le16(p + 21, 512); /* cache size in sectors */
    put_le16(p + 22, 4); /* ecc bytes */
    padstr((char *)(p + 23), s->version, 8); /* firmware version */
    padstr((char *)(p + 27), "QEMU HARDDISK", 40); /* model */
#if MAX_MULT_SECTORS > 1
    put_le16(p + 47, 0x8000 | MAX_MULT_SECTORS);
#endif
    put_le16(p + 48, 1); /* dword I/O */
    put_le16(p + 49, (1 << 11) | (1 << 9) | (1 << 8)); /* DMA and LBA supported */
    put_le16(p + 51, 0x200); /* PIO transfer cycle */
    put_le16(p + 52, 0x200); /* DMA transfer cycle */
    put_le16(p + 53, 1 | (1 << 1) | (1 << 2)); /* words 54-58,64-70,88 are valid */
    put_le16(p + 54, s->cylinders);
    put_le16(p + 55, s->heads);
    put_le16(p + 56, s->sectors);
    oldsize = s->cylinders * s->heads * s->sectors;
    put_le16(p + 57, oldsize);
    put_le16(p + 58, oldsize >> 16);
    if (s->mult_sectors)
        put_le16(p + 59, 0x100 | s->mult_sectors);
    put_le16(p + 60, s->nb_sectors);
    put_le16(p + 61, s->nb_sectors >> 16);
    put_le16(p + 62, 0x07); /* single word dma0-2 supported */
    put_le16(p + 63, 0x07); /* mdma0-2 supported */
    put_le16(p + 65, 120);
    put_le16(p + 66, 120);
    put_le16(p + 67, 120);
    put_le16(p + 68, 120);
    put_le16(p + 80, 0xf0); /* ata3 -> ata6 supported */
    put_le16(p + 81, 0x16); /* conforms to ata5 */
    /* 14=NOP supported, 0=SMART supported */
    put_le16(p + 82, (1 << 14) | 1);
    /* 13=flush_cache_ext,12=flush_cache,10=lba48 */
    put_le16(p + 83, (1 << 14) | (1 << 13) | (1 <<12) | (1 << 10));
    /* 14=set to 1, 1=SMART self test, 0=SMART error logging */
    put_le16(p + 84, (1 << 14) | 0);
    /* 14 = NOP supported, 5=WCACHE enabled, 0=SMART feature set enabled */
    if (bdrv_enable_write_cache(s->bs))
         put_le16(p + 85, (1 << 14) | (1 << 5) | 1);
    else
         put_le16(p + 85, (1 << 14) | 1);
    /* 13=flush_cache_ext,12=flush_cache,10=lba48 */
    put_le16(p + 86, (1 << 14) | (1 << 13) | (1 <<12) | (1 << 10));
    /* 14=set to 1, 1=smart self test, 0=smart error logging */
    put_le16(p + 87, (1 << 14) | 0);
    put_le16(p + 88, 0x3f | (1 << 13)); /* udma5 set and supported */
    put_le16(p + 93, 1 | (1 << 14) | 0x2000);
    put_le16(p + 100, s->nb_sectors);
    put_le16(p + 101, s->nb_sectors >> 16);
    put_le16(p + 102, s->nb_sectors >> 32);
    put_le16(p + 103, s->nb_sectors >> 48);
    dev = s->unit ? s->bus->slave : s->bus->master;
    if (dev && dev->conf.physical_block_size)
        put_le16(p + 106, 0x6000 | get_physical_block_exp(&dev->conf));

    memcpy(s->identify_data, p, sizeof(s->identify_data));
    s->identify_set = 1;
}

static void ide_atapi_identify(IDEState *s)
{
    uint16_t *p;

    if (s->identify_set) {
	memcpy(s->io_buffer, s->identify_data, sizeof(s->identify_data));
	return;
    }

    memset(s->io_buffer, 0, 512);
    p = (uint16_t *)s->io_buffer;
    /* Removable CDROM, 50us response, 12 byte packets */
    put_le16(p + 0, (2 << 14) | (5 << 8) | (1 << 7) | (2 << 5) | (0 << 0));
    padstr((char *)(p + 10), s->drive_serial_str, 20); /* serial number */
    put_le16(p + 20, 3); /* buffer type */
    put_le16(p + 21, 512); /* cache size in sectors */
    put_le16(p + 22, 4); /* ecc bytes */
    padstr((char *)(p + 23), s->version, 8); /* firmware version */
    padstr((char *)(p + 27), "QEMU DVD-ROM", 40); /* model */
    put_le16(p + 48, 1); /* dword I/O (XXX: should not be set on CDROM) */
#ifdef USE_DMA_CDROM
    put_le16(p + 49, 1 << 9 | 1 << 8); /* DMA and LBA supported */
    put_le16(p + 53, 7); /* words 64-70, 54-58, 88 valid */
    put_le16(p + 62, 7);  /* single word dma0-2 supported */
    put_le16(p + 63, 7);  /* mdma0-2 supported */
    put_le16(p + 64, 0x3f); /* PIO modes supported */
#else
    put_le16(p + 49, 1 << 9); /* LBA supported, no DMA */
    put_le16(p + 53, 3); /* words 64-70, 54-58 valid */
    put_le16(p + 63, 0x103); /* DMA modes XXX: may be incorrect */
    put_le16(p + 64, 1); /* PIO modes */
#endif
    put_le16(p + 65, 0xb4); /* minimum DMA multiword tx cycle time */
    put_le16(p + 66, 0xb4); /* recommended DMA multiword tx cycle time */
    put_le16(p + 67, 0x12c); /* minimum PIO cycle time without flow control */
    put_le16(p + 68, 0xb4); /* minimum PIO cycle time with IORDY flow control */

    put_le16(p + 71, 30); /* in ns */
    put_le16(p + 72, 30); /* in ns */

    put_le16(p + 80, 0x1e); /* support up to ATA/ATAPI-4 */
#ifdef USE_DMA_CDROM
    put_le16(p + 88, 0x3f | (1 << 13)); /* udma5 set and supported */
#endif
    memcpy(s->identify_data, p, sizeof(s->identify_data));
    s->identify_set = 1;
}

static void ide_cfata_identify(IDEState *s)
{
    uint16_t *p;
    uint32_t cur_sec;

    p = (uint16_t *) s->identify_data;
    if (s->identify_set)
        goto fill_buffer;

    memset(p, 0, sizeof(s->identify_data));

    cur_sec = s->cylinders * s->heads * s->sectors;

    put_le16(p + 0, 0x848a);			/* CF Storage Card signature */
    put_le16(p + 1, s->cylinders);		/* Default cylinders */
    put_le16(p + 3, s->heads);			/* Default heads */
    put_le16(p + 6, s->sectors);		/* Default sectors per track */
    put_le16(p + 7, s->nb_sectors >> 16);	/* Sectors per card */
    put_le16(p + 8, s->nb_sectors);		/* Sectors per card */
    padstr((char *)(p + 10), s->drive_serial_str, 20); /* serial number */
    put_le16(p + 22, 0x0004);			/* ECC bytes */
    padstr((char *) (p + 23), s->version, 8);	/* Firmware Revision */
    padstr((char *) (p + 27), "QEMU MICRODRIVE", 40);/* Model number */
#if MAX_MULT_SECTORS > 1
    put_le16(p + 47, 0x8000 | MAX_MULT_SECTORS);
#else
    put_le16(p + 47, 0x0000);
#endif
    put_le16(p + 49, 0x0f00);			/* Capabilities */
    put_le16(p + 51, 0x0002);			/* PIO cycle timing mode */
    put_le16(p + 52, 0x0001);			/* DMA cycle timing mode */
    put_le16(p + 53, 0x0003);			/* Translation params valid */
    put_le16(p + 54, s->cylinders);		/* Current cylinders */
    put_le16(p + 55, s->heads);			/* Current heads */
    put_le16(p + 56, s->sectors);		/* Current sectors */
    put_le16(p + 57, cur_sec);			/* Current capacity */
    put_le16(p + 58, cur_sec >> 16);		/* Current capacity */
    if (s->mult_sectors)			/* Multiple sector setting */
        put_le16(p + 59, 0x100 | s->mult_sectors);
    put_le16(p + 60, s->nb_sectors);		/* Total LBA sectors */
    put_le16(p + 61, s->nb_sectors >> 16);	/* Total LBA sectors */
    put_le16(p + 63, 0x0203);			/* Multiword DMA capability */
    put_le16(p + 64, 0x0001);			/* Flow Control PIO support */
    put_le16(p + 65, 0x0096);			/* Min. Multiword DMA cycle */
    put_le16(p + 66, 0x0096);			/* Rec. Multiword DMA cycle */
    put_le16(p + 68, 0x00b4);			/* Min. PIO cycle time */
    put_le16(p + 82, 0x400c);			/* Command Set supported */
    put_le16(p + 83, 0x7068);			/* Command Set supported */
    put_le16(p + 84, 0x4000);			/* Features supported */
    put_le16(p + 85, 0x000c);			/* Command Set enabled */
    put_le16(p + 86, 0x7044);			/* Command Set enabled */
    put_le16(p + 87, 0x4000);			/* Features enabled */
    put_le16(p + 91, 0x4060);			/* Current APM level */
    put_le16(p + 129, 0x0002);			/* Current features option */
    put_le16(p + 130, 0x0005);			/* Reassigned sectors */
    put_le16(p + 131, 0x0001);			/* Initial power mode */
    put_le16(p + 132, 0x0000);			/* User signature */
    put_le16(p + 160, 0x8100);			/* Power requirement */
    put_le16(p + 161, 0x8001);			/* CF command set */

    s->identify_set = 1;

fill_buffer:
    memcpy(s->io_buffer, p, sizeof(s->identify_data));
}

static void ide_set_signature(IDEState *s)
{
    s->select &= 0xf0; /* clear head */
    /* put signature */
    s->nsector = 1;
    s->sector = 1;
    if (s->drive_kind == IDE_CD) {
        s->lcyl = 0x14;
        s->hcyl = 0xeb;
    } else if (s->bs) {
        s->lcyl = 0;
        s->hcyl = 0;
    } else {
        s->lcyl = 0xff;
        s->hcyl = 0xff;
    }
}

static inline void ide_abort_command(IDEState *s)
{
    s->status = READY_STAT | ERR_STAT;
    s->error = ABRT_ERR;
}

static inline void ide_dma_submit_check(IDEState *s,
          BlockDriverCompletionFunc *dma_cb, BMDMAState *bm)
{
    if (bm->aiocb)
	return;
    dma_cb(bm, -1);
}

/* prepare data transfer and tell what to do after */
static void ide_transfer_start(IDEState *s, uint8_t *buf, int size,
                               EndTransferFunc *end_transfer_func)
{
    s->end_transfer_func = end_transfer_func;
    s->data_ptr = buf;
    s->data_end = buf + size;
    if (!(s->status & ERR_STAT))
        s->status |= DRQ_STAT;
}

static void ide_transfer_stop(IDEState *s)
{
    s->end_transfer_func = ide_transfer_stop;
    s->data_ptr = s->io_buffer;
    s->data_end = s->io_buffer;
    s->status &= ~DRQ_STAT;
}

int64_t ide_get_sector(IDEState *s)
{
    int64_t sector_num;
    if (s->select & 0x40) {
        /* lba */
	if (!s->lba48) {
	    sector_num = ((s->select & 0x0f) << 24) | (s->hcyl << 16) |
		(s->lcyl << 8) | s->sector;
	} else {
	    sector_num = ((int64_t)s->hob_hcyl << 40) |
		((int64_t) s->hob_lcyl << 32) |
		((int64_t) s->hob_sector << 24) |
		((int64_t) s->hcyl << 16) |
		((int64_t) s->lcyl << 8) | s->sector;
	}
    } else {
        sector_num = ((s->hcyl << 8) | s->lcyl) * s->heads * s->sectors +
            (s->select & 0x0f) * s->sectors + (s->sector - 1);
    }
    return sector_num;
}

void ide_set_sector(IDEState *s, int64_t sector_num)
{
    unsigned int cyl, r;
    if (s->select & 0x40) {
	if (!s->lba48) {
            s->select = (s->select & 0xf0) | (sector_num >> 24);
            s->hcyl = (sector_num >> 16);
            s->lcyl = (sector_num >> 8);
            s->sector = (sector_num);
	} else {
	    s->sector = sector_num;
	    s->lcyl = sector_num >> 8;
	    s->hcyl = sector_num >> 16;
	    s->hob_sector = sector_num >> 24;
	    s->hob_lcyl = sector_num >> 32;
	    s->hob_hcyl = sector_num >> 40;
	}
    } else {
        cyl = sector_num / (s->heads * s->sectors);
        r = sector_num % (s->heads * s->sectors);
        s->hcyl = cyl >> 8;
        s->lcyl = cyl;
        s->select = (s->select & 0xf0) | ((r / s->sectors) & 0x0f);
        s->sector = (r % s->sectors) + 1;
    }
}

static void ide_rw_error(IDEState *s) {
    ide_abort_command(s);
    ide_set_irq(s->bus);
}

static void ide_sector_read(IDEState *s)
{
    int64_t sector_num;
    int ret, n;

    s->status = READY_STAT | SEEK_STAT;
    s->error = 0; /* not needed by IDE spec, but needed by Windows */
    sector_num = ide_get_sector(s);
    n = s->nsector;
    if (n == 0) {
        /* no more sector to read from disk */
        ide_transfer_stop(s);
    } else {
#if defined(DEBUG_IDE)
        printf("read sector=%" PRId64 "\n", sector_num);
#endif
        if (n > s->req_nb_sectors)
            n = s->req_nb_sectors;
        ret = bdrv_read(s->bs, sector_num, s->io_buffer, n);
        if (ret != 0) {
            if (ide_handle_rw_error(s, -ret,
                BM_STATUS_PIO_RETRY | BM_STATUS_RETRY_READ))
            {
                return;
            }
        }
        ide_transfer_start(s, s->io_buffer, 512 * n, ide_sector_read);
        ide_set_irq(s->bus);
        ide_set_sector(s, sector_num + n);
        s->nsector -= n;
    }
}


/* return 0 if buffer completed */
static int dma_buf_prepare(BMDMAState *bm, int is_write)
{
    IDEState *s = bmdma_active_if(bm);
    struct {
        uint32_t addr;
        uint32_t size;
    } prd;
    int l, len;

    qemu_sglist_init(&s->sg, s->nsector / (IDE_PAGE_SIZE / 512) + 1);
    s->io_buffer_size = 0;
    for(;;) {
        if (bm->cur_prd_len == 0) {
            /* end of table (with a fail safe of one page) */
            if (bm->cur_prd_last ||
                (bm->cur_addr - bm->addr) >= IDE_PAGE_SIZE)
                return s->io_buffer_size != 0;
            cpu_physical_memory_read(bm->cur_addr, (uint8_t *)&prd, 8);
            bm->cur_addr += 8;
            prd.addr = le32_to_cpu(prd.addr);
            prd.size = le32_to_cpu(prd.size);
            len = prd.size & 0xfffe;
            if (len == 0)
                len = 0x10000;
            bm->cur_prd_len = len;
            bm->cur_prd_addr = prd.addr;
            bm->cur_prd_last = (prd.size & 0x80000000);
        }
        l = bm->cur_prd_len;
        if (l > 0) {
            qemu_sglist_add(&s->sg, bm->cur_prd_addr, l);
            bm->cur_prd_addr += l;
            bm->cur_prd_len -= l;
            s->io_buffer_size += l;
        }
    }
    return 1;
}

static void dma_buf_commit(IDEState *s, int is_write)
{
    qemu_sglist_destroy(&s->sg);
}

void ide_dma_error(IDEState *s)
{
    ide_transfer_stop(s);
    s->error = ABRT_ERR;
    s->status = READY_STAT | ERR_STAT;
    ide_set_irq(s->bus);
}

static int ide_handle_rw_error(IDEState *s, int error, int op)
{
    int is_read = (op & BM_STATUS_RETRY_READ);
    BlockErrorAction action = bdrv_get_on_error(s->bs, is_read);

    if (action == BLOCK_ERR_IGNORE) {
        bdrv_mon_event(s->bs, BDRV_ACTION_IGNORE, is_read);
        return 0;
    }

    if ((error == ENOSPC && action == BLOCK_ERR_STOP_ENOSPC)
            || action == BLOCK_ERR_STOP_ANY) {
        s->bus->bmdma->unit = s->unit;
        s->bus->bmdma->status |= op;
        bdrv_mon_event(s->bs, BDRV_ACTION_STOP, is_read);
        vm_stop(0);
    } else {
        if (op & BM_STATUS_DMA_RETRY) {
            dma_buf_commit(s, 0);
            ide_dma_error(s);
        } else {
            ide_rw_error(s);
        }
        bdrv_mon_event(s->bs, BDRV_ACTION_REPORT, is_read);
    }

    return 1;
}

/* return 0 if buffer completed */
static int dma_buf_rw(BMDMAState *bm, int is_write)
{
    IDEState *s = bmdma_active_if(bm);
    struct {
        uint32_t addr;
        uint32_t size;
    } prd;
    int l, len;

    for(;;) {
        l = s->io_buffer_size - s->io_buffer_index;
        if (l <= 0)
            break;
        if (bm->cur_prd_len == 0) {
            /* end of table (with a fail safe of one page) */
            if (bm->cur_prd_last ||
                (bm->cur_addr - bm->addr) >= IDE_PAGE_SIZE)
                return 0;
            cpu_physical_memory_read(bm->cur_addr, (uint8_t *)&prd, 8);
            bm->cur_addr += 8;
            prd.addr = le32_to_cpu(prd.addr);
            prd.size = le32_to_cpu(prd.size);
            len = prd.size & 0xfffe;
            if (len == 0)
                len = 0x10000;
            bm->cur_prd_len = len;
            bm->cur_prd_addr = prd.addr;
            bm->cur_prd_last = (prd.size & 0x80000000);
        }
        if (l > bm->cur_prd_len)
            l = bm->cur_prd_len;
        if (l > 0) {
            if (is_write) {
                cpu_physical_memory_write(bm->cur_prd_addr,
                                          s->io_buffer + s->io_buffer_index, l);
            } else {
                cpu_physical_memory_read(bm->cur_prd_addr,
                                          s->io_buffer + s->io_buffer_index, l);
            }
            bm->cur_prd_addr += l;
            bm->cur_prd_len -= l;
            s->io_buffer_index += l;
        }
    }
    return 1;
}

static void ide_read_dma_cb(void *opaque, int ret)
{
    BMDMAState *bm = opaque;
    IDEState *s = bmdma_active_if(bm);
    int n;
    int64_t sector_num;

    if (ret < 0) {
        if (ide_handle_rw_error(s, -ret,
            BM_STATUS_DMA_RETRY | BM_STATUS_RETRY_READ))
        {
            return;
        }
    }

    n = s->io_buffer_size >> 9;
    sector_num = ide_get_sector(s);
    if (n > 0) {
        dma_buf_commit(s, 1);
        sector_num += n;
        ide_set_sector(s, sector_num);
        s->nsector -= n;
    }

    /* end of transfer ? */
    if (s->nsector == 0) {
        s->status = READY_STAT | SEEK_STAT;
        ide_set_irq(s->bus);
    eot:
        bm->status &= ~BM_STATUS_DMAING;
        bm->status |= BM_STATUS_INT;
        bm->dma_cb = NULL;
        bm->unit = -1;
        bm->aiocb = NULL;
        return;
    }

    /* launch next transfer */
    n = s->nsector;
    s->io_buffer_index = 0;
    s->io_buffer_size = n * 512;
    if (dma_buf_prepare(bm, 1) == 0)
        goto eot;
#ifdef DEBUG_AIO
    printf("aio_read: sector_num=%" PRId64 " n=%d\n", sector_num, n);
#endif
    bm->aiocb = dma_bdrv_read(s->bs, &s->sg, sector_num, ide_read_dma_cb, bm);
    ide_dma_submit_check(s, ide_read_dma_cb, bm);
}

static void ide_sector_read_dma(IDEState *s)
{
    s->status = READY_STAT | SEEK_STAT | DRQ_STAT | BUSY_STAT;
    s->io_buffer_index = 0;
    s->io_buffer_size = 0;
    s->is_read = 1;
    ide_dma_start(s, ide_read_dma_cb);
}

static void ide_sector_write_timer_cb(void *opaque)
{
    IDEState *s = opaque;
    ide_set_irq(s->bus);
}

static void ide_sector_write(IDEState *s)
{
    int64_t sector_num;
    int ret, n, n1;

    s->status = READY_STAT | SEEK_STAT;
    sector_num = ide_get_sector(s);
#if defined(DEBUG_IDE)
    printf("write sector=%" PRId64 "\n", sector_num);
#endif
    n = s->nsector;
    if (n > s->req_nb_sectors)
        n = s->req_nb_sectors;
    ret = bdrv_write(s->bs, sector_num, s->io_buffer, n);

    if (ret != 0) {
        if (ide_handle_rw_error(s, -ret, BM_STATUS_PIO_RETRY))
            return;
    }

    s->nsector -= n;
    if (s->nsector == 0) {
        /* no more sectors to write */
        ide_transfer_stop(s);
    } else {
        n1 = s->nsector;
        if (n1 > s->req_nb_sectors)
            n1 = s->req_nb_sectors;
        ide_transfer_start(s, s->io_buffer, 512 * n1, ide_sector_write);
    }
    ide_set_sector(s, sector_num + n);

    if (win2k_install_hack && ((++s->irq_count % 16) == 0)) {
        /* It seems there is a bug in the Windows 2000 installer HDD
           IDE driver which fills the disk with empty logs when the
           IDE write IRQ comes too early. This hack tries to correct
           that at the expense of slower write performances. Use this
           option _only_ to install Windows 2000. You must disable it
           for normal use. */
        qemu_mod_timer(s->sector_write_timer,
                       qemu_get_clock(vm_clock) + (get_ticks_per_sec() / 1000));
    } else {
        ide_set_irq(s->bus);
    }
}

static void ide_dma_restart_bh(void *opaque)
{
    BMDMAState *bm = opaque;
    int is_read;

    qemu_bh_delete(bm->bh);
    bm->bh = NULL;

    is_read = !!(bm->status & BM_STATUS_RETRY_READ);

    if (bm->status & BM_STATUS_DMA_RETRY) {
        bm->status &= ~(BM_STATUS_DMA_RETRY | BM_STATUS_RETRY_READ);
        ide_dma_restart(bmdma_active_if(bm), is_read);
    } else if (bm->status & BM_STATUS_PIO_RETRY) {
        bm->status &= ~(BM_STATUS_PIO_RETRY | BM_STATUS_RETRY_READ);
        if (is_read) {
            ide_sector_read(bmdma_active_if(bm));
        } else {
            ide_sector_write(bmdma_active_if(bm));
        }
    }
}

void ide_dma_restart_cb(void *opaque, int running, int reason)
{
    BMDMAState *bm = opaque;

    if (!running)
        return;

    if (!bm->bh) {
        bm->bh = qemu_bh_new(ide_dma_restart_bh, bm);
        qemu_bh_schedule(bm->bh);
    }
}

static void ide_write_dma_cb(void *opaque, int ret)
{
    BMDMAState *bm = opaque;
    IDEState *s = bmdma_active_if(bm);
    int n;
    int64_t sector_num;

    if (ret < 0) {
        if (ide_handle_rw_error(s, -ret,  BM_STATUS_DMA_RETRY))
            return;
    }

    n = s->io_buffer_size >> 9;
    sector_num = ide_get_sector(s);
    if (n > 0) {
        dma_buf_commit(s, 0);
        sector_num += n;
        ide_set_sector(s, sector_num);
        s->nsector -= n;
    }

    /* end of transfer ? */
    if (s->nsector == 0) {
        s->status = READY_STAT | SEEK_STAT;
        ide_set_irq(s->bus);
    eot:
        bm->status &= ~BM_STATUS_DMAING;
        bm->status |= BM_STATUS_INT;
        bm->dma_cb = NULL;
        bm->unit = -1;
        bm->aiocb = NULL;
        return;
    }

    n = s->nsector;
    s->io_buffer_size = n * 512;
    /* launch next transfer */
    if (dma_buf_prepare(bm, 0) == 0)
        goto eot;
#ifdef DEBUG_AIO
    printf("aio_write: sector_num=%" PRId64 " n=%d\n", sector_num, n);
#endif
    bm->aiocb = dma_bdrv_write(s->bs, &s->sg, sector_num, ide_write_dma_cb, bm);
    ide_dma_submit_check(s, ide_write_dma_cb, bm);
}

static void ide_sector_write_dma(IDEState *s)
{
    s->status = READY_STAT | SEEK_STAT | DRQ_STAT | BUSY_STAT;
    s->io_buffer_index = 0;
    s->io_buffer_size = 0;
    s->is_read = 0;
    ide_dma_start(s, ide_write_dma_cb);
}

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);
}

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);
}

static void ide_flush_cb(void *opaque, int ret)
{
    IDEState *s = opaque;

    /* XXX: how do we signal I/O errors here? */

    s->status = READY_STAT | SEEK_STAT;
    ide_set_irq(s->bus);
}

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;
}

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_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 */
static 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;
            ide_transfer_start(s, s->io_buffer + s->io_buffer_index,
                               size, ide_atapi_cmd_reply_end);
            s->packet_transfer_size -= size;
            s->elementary_transfer_size -= size;
            s->io_buffer_index += size;
        } 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);
            }
            ide_transfer_start(s, s->io_buffer + s->io_buffer_index,
                               size, ide_atapi_cmd_reply_end);
            s->packet_transfer_size -= size;
            s->elementary_transfer_size -= size;
            s->io_buffer_index += size;
            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;
	ide_dma_start(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);
}

/* ATAPI DMA support */

/* XXX: handle read errors */
static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret)
{
    BMDMAState *bm = opaque;
    IDEState *s = bmdma_active_if(bm);
    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 (dma_buf_rw(bm, 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:
        bm->status &= ~BM_STATUS_DMAING;
        bm->status |= BM_STATUS_INT;
        bm->dma_cb = NULL;
        bm->unit = -1;
        bm->aiocb = NULL;
        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
    bm->iov.iov_base = (void *)(s->io_buffer + data_offset);
    bm->iov.iov_len = n * 4 * 512;
    qemu_iovec_init_external(&bm->qiov, &bm->iov, 1);
    bm->aiocb = bdrv_aio_readv(s->bs, (int64_t)s->lba << 2, &bm->qiov,
                               n * 4, ide_atapi_cmd_read_dma_cb, bm);
    if (!bm->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;
    ide_dma_start(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;

                bdrv_get_geometry(s->bs, &total_sectors);
                total_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 void ide_atapi_cmd(IDEState *s)
{
    const uint8_t *packet;
    uint8_t *buf;
    int max_len;

    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
       REQUEST_SENSE and INQUIRY commands are allowed to complete. */
    if (s->sense_key == SENSE_UNIT_ATTENTION &&
	s->io_buffer[0] != GPCMD_REQUEST_SENSE &&
	s->io_buffer[0] != GPCMD_INQUIRY) {
	ide_atapi_cmd_check_status(s);
	return;
    }
    switch(s->io_buffer[0]) {
    case GPCMD_TEST_UNIT_READY:
        if (bdrv_is_inserted(s->bs) && !s->cdrom_changed) {
            ide_atapi_cmd_ok(s);
        } else {
            s->cdrom_changed = 0;
            ide_atapi_cmd_error(s, SENSE_NOT_READY,
                                ASC_MEDIUM_NOT_PRESENT);
        }
        break;
    case GPCMD_MODE_SENSE_6:
    case GPCMD_MODE_SENSE_10:
        {
            int action, code;
            if (packet[0] == GPCMD_MODE_SENSE_10)
                max_len = ube16_to_cpu(packet + 7);
            else
                max_len = packet[4];
            action = packet[2] >> 6;
            code = packet[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;
            }
        }
        break;
    case GPCMD_REQUEST_SENSE:
        max_len = packet[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);
        break;
    case GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
        if (bdrv_is_inserted(s->bs)) {
            bdrv_set_locked(s->bs, packet[4] & 1);
            ide_atapi_cmd_ok(s);
        } else {
            ide_atapi_cmd_error(s, SENSE_NOT_READY,
                                ASC_MEDIUM_NOT_PRESENT);
        }
        break;
    case GPCMD_READ_10:
    case GPCMD_READ_12:
        {
            int nb_sectors, lba;

            if (packet[0] == GPCMD_READ_10)
                nb_sectors = ube16_to_cpu(packet + 7);
            else
                nb_sectors = ube32_to_cpu(packet + 6);
            lba = ube32_to_cpu(packet + 2);
            if (nb_sectors == 0) {
                ide_atapi_cmd_ok(s);
                break;
            }
            ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
        }
        break;
    case GPCMD_READ_CD:
        {
            int nb_sectors, lba, transfer_request;

            nb_sectors = (packet[6] << 16) | (packet[7] << 8) | packet[8];
            lba = ube32_to_cpu(packet + 2);
            if (nb_sectors == 0) {
                ide_atapi_cmd_ok(s);
                break;
            }
            transfer_request = packet[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;
            }
        }
        break;
    case GPCMD_SEEK:
        {
            unsigned int lba;
            uint64_t total_sectors;

            bdrv_get_geometry(s->bs, &total_sectors);
            total_sectors >>= 2;
            if (total_sectors == 0) {
                ide_atapi_cmd_error(s, SENSE_NOT_READY,
                                    ASC_MEDIUM_NOT_PRESENT);
                break;
            }
            lba = ube32_to_cpu(packet + 2);
            if (lba >= total_sectors) {
                ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
                                    ASC_LOGICAL_BLOCK_OOR);
                break;
            }
            ide_atapi_cmd_ok(s);
        }
        break;
    case GPCMD_START_STOP_UNIT:
        {
            int start, eject, err = 0;
            start = packet[4] & 1;
            eject = (packet[4] >> 1) & 1;

            if (eject) {
                err = bdrv_eject(s->bs, !start);
            }

            switch (err) {
            case 0:
                ide_atapi_cmd_ok(s);
                break;
            case -EBUSY:
                ide_atapi_cmd_error(s, SENSE_NOT_READY,
                                    ASC_MEDIA_REMOVAL_PREVENTED);
                break;
            default:
                ide_atapi_cmd_error(s, SENSE_NOT_READY,
                                    ASC_MEDIUM_NOT_PRESENT);
                break;
            }
        }
        break;
    case GPCMD_MECHANISM_STATUS:
        {
            max_len = ube16_to_cpu(packet + 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);
        }
        break;
    case GPCMD_READ_TOC_PMA_ATIP:
        {
            int format, msf, start_track, len;
            uint64_t total_sectors;

            bdrv_get_geometry(s->bs, &total_sectors);
            total_sectors >>= 2;
            if (total_sectors == 0) {
                ide_atapi_cmd_error(s, SENSE_NOT_READY,
                                    ASC_MEDIUM_NOT_PRESENT);
                break;
            }
            max_len = ube16_to_cpu(packet + 7);
            format = packet[9] >> 6;
            msf = (packet[1] >> 1) & 1;
            start_track = packet[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);
                break;
            }
        }
        break;
    case GPCMD_READ_CDVD_CAPACITY:
        {
            uint64_t total_sectors;

            bdrv_get_geometry(s->bs, &total_sectors);
            total_sectors >>= 2;
            if (total_sectors == 0) {
                ide_atapi_cmd_error(s, SENSE_NOT_READY,
                                    ASC_MEDIUM_NOT_PRESENT);
                break;
            }
            /* 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);
        }
        break;
    case GPCMD_READ_DVD_STRUCTURE:
        {
            int media = packet[1];
            int format = packet[7];
            int ret;

            max_len = ube16_to_cpu(packet + 8);

            if (format < 0xff) {
                if (media_is_cd(s)) {
                    ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
                                        ASC_INCOMPATIBLE_FORMAT);
                    break;
                } else if (!media_present(s)) {
                    ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
                                        ASC_INV_FIELD_IN_CMD_PACKET);
                    break;
                }
            }

            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, packet, 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;
            }
        }
        break;
    case GPCMD_SET_SPEED:
        ide_atapi_cmd_ok(s);
        break;
    case GPCMD_INQUIRY:
        max_len = packet[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);
        break;
    case GPCMD_GET_CONFIGURATION:
        {
            uint32_t len;
            uint8_t index = 0;

            /* only feature 0 is supported */
            if (packet[2] != 0 || packet[3] != 0) {
                ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
                                    ASC_INV_FIELD_IN_CMD_PACKET);
                break;
            }

            /* XXX: could result in alignment problems in some architectures */
            max_len = ube16_to_cpu(packet + 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);
            break;
        }
    default:
        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST,
                            ASC_ILLEGAL_OPCODE);
        break;
    }
}

static void ide_cfata_metadata_inquiry(IDEState *s)
{
    uint16_t *p;
    uint32_t spd;

    p = (uint16_t *) s->io_buffer;
    memset(p, 0, 0x200);
    spd = ((s->mdata_size - 1) >> 9) + 1;

    put_le16(p + 0, 0x0001);			/* Data format revision */
    put_le16(p + 1, 0x0000);			/* Media property: silicon */
    put_le16(p + 2, s->media_changed);		/* Media status */
    put_le16(p + 3, s->mdata_size & 0xffff);	/* Capacity in bytes (low) */
    put_le16(p + 4, s->mdata_size >> 16);	/* Capacity in bytes (high) */
    put_le16(p + 5, spd & 0xffff);		/* Sectors per device (low) */
    put_le16(p + 6, spd >> 16);			/* Sectors per device (high) */
}

static void ide_cfata_metadata_read(IDEState *s)
{
    uint16_t *p;

    if (((s->hcyl << 16) | s->lcyl) << 9 > s->mdata_size + 2) {
        s->status = ERR_STAT;
        s->error = ABRT_ERR;
        return;
    }

    p = (uint16_t *) s->io_buffer;
    memset(p, 0, 0x200);

    put_le16(p + 0, s->media_changed);		/* Media status */
    memcpy(p + 1, s->mdata_storage + (((s->hcyl << 16) | s->lcyl) << 9),
                    MIN(MIN(s->mdata_size - (((s->hcyl << 16) | s->lcyl) << 9),
                                    s->nsector << 9), 0x200 - 2));
}

static void ide_cfata_metadata_write(IDEState *s)
{
    if (((s->hcyl << 16) | s->lcyl) << 9 > s->mdata_size + 2) {
        s->status = ERR_STAT;
        s->error = ABRT_ERR;
        return;
    }

    s->media_changed = 0;

    memcpy(s->mdata_storage + (((s->hcyl << 16) | s->lcyl) << 9),
                    s->io_buffer + 2,
                    MIN(MIN(s->mdata_size - (((s->hcyl << 16) | s->lcyl) << 9),
                                    s->nsector << 9), 0x200 - 2));
}

/* called when the inserted state of the media has changed */
static void cdrom_change_cb(void *opaque)
{
    IDEState *s = opaque;
    uint64_t nb_sectors;

    bdrv_get_geometry(s->bs, &nb_sectors);
    s->nb_sectors = nb_sectors;

    s->sense_key = SENSE_UNIT_ATTENTION;
    s->asc = ASC_MEDIUM_MAY_HAVE_CHANGED;
    s->cdrom_changed = 1;
    ide_set_irq(s->bus);
}

static void ide_cmd_lba48_transform(IDEState *s, int lba48)
{
    s->lba48 = lba48;

    /* handle the 'magic' 0 nsector count conversion here. to avoid
     * fiddling with the rest of the read logic, we just store the
     * full sector count in ->nsector and ignore ->hob_nsector from now
     */
    if (!s->lba48) {
	if (!s->nsector)
	    s->nsector = 256;
    } else {
	if (!s->nsector && !s->hob_nsector)
	    s->nsector = 65536;
	else {
	    int lo = s->nsector;
	    int hi = s->hob_nsector;

	    s->nsector = (hi << 8) | lo;
	}
    }
}

static void ide_clear_hob(IDEBus *bus)
{
    /* any write clears HOB high bit of device control register */
    bus->ifs[0].select &= ~(1 << 7);
    bus->ifs[1].select &= ~(1 << 7);
}

void ide_ioport_write(void *opaque, uint32_t addr, uint32_t val)
{
    IDEBus *bus = opaque;
    IDEState *s;
    int n;
    int lba48 = 0;

#ifdef DEBUG_IDE
    printf("IDE: write addr=0x%x val=0x%02x\n", addr, val);
#endif

    addr &= 7;

    /* ignore writes to command block while busy with previous command */
    if (addr != 7 && (idebus_active_if(bus)->status & (BUSY_STAT|DRQ_STAT)))
        return;

    switch(addr) {
    case 0:
        break;
    case 1:
	ide_clear_hob(bus);
        /* NOTE: data is written to the two drives */
	bus->ifs[0].hob_feature = bus->ifs[0].feature;
	bus->ifs[1].hob_feature = bus->ifs[1].feature;
        bus->ifs[0].feature = val;
        bus->ifs[1].feature = val;
        break;
    case 2:
	ide_clear_hob(bus);
	bus->ifs[0].hob_nsector = bus->ifs[0].nsector;
	bus->ifs[1].hob_nsector = bus->ifs[1].nsector;
        bus->ifs[0].nsector = val;
        bus->ifs[1].nsector = val;
        break;
    case 3:
	ide_clear_hob(bus);
	bus->ifs[0].hob_sector = bus->ifs[0].sector;
	bus->ifs[1].hob_sector = bus->ifs[1].sector;
        bus->ifs[0].sector = val;
        bus->ifs[1].sector = val;
        break;
    case 4:
	ide_clear_hob(bus);
	bus->ifs[0].hob_lcyl = bus->ifs[0].lcyl;
	bus->ifs[1].hob_lcyl = bus->ifs[1].lcyl;
        bus->ifs[0].lcyl = val;
        bus->ifs[1].lcyl = val;
        break;
    case 5:
	ide_clear_hob(bus);
	bus->ifs[0].hob_hcyl = bus->ifs[0].hcyl;
	bus->ifs[1].hob_hcyl = bus->ifs[1].hcyl;
        bus->ifs[0].hcyl = val;
        bus->ifs[1].hcyl = val;
        break;
    case 6:
	/* FIXME: HOB readback uses bit 7 */
        bus->ifs[0].select = (val & ~0x10) | 0xa0;
        bus->ifs[1].select = (val | 0x10) | 0xa0;
        /* select drive */
        bus->unit = (val >> 4) & 1;
        break;
    default:
    case 7:
        /* command */
#if defined(DEBUG_IDE)
        printf("ide: CMD=%02x\n", val);
#endif
        s = idebus_active_if(bus);
        /* ignore commands to non existant slave */
        if (s != bus->ifs && !s->bs)
            break;

        /* Only DEVICE RESET is allowed while BSY or/and DRQ are set */
        if ((s->status & (BUSY_STAT|DRQ_STAT)) && val != WIN_DEVICE_RESET)
            break;

        switch(val) {
        case WIN_IDENTIFY:
            if (s->bs && s->drive_kind != IDE_CD) {
                if (s->drive_kind != IDE_CFATA)
                    ide_identify(s);
                else
                    ide_cfata_identify(s);
                s->status = READY_STAT | SEEK_STAT;
                ide_transfer_start(s, s->io_buffer, 512, ide_transfer_stop);
            } else {
                if (s->drive_kind == IDE_CD) {
                    ide_set_signature(s);
                }
                ide_abort_command(s);
            }
            ide_set_irq(s->bus);
            break;
        case WIN_SPECIFY:
        case WIN_RECAL:
            s->error = 0;
            s->status = READY_STAT | SEEK_STAT;
            ide_set_irq(s->bus);
            break;
        case WIN_SETMULT:
            if (s->drive_kind == IDE_CFATA && s->nsector == 0) {
                /* Disable Read and Write Multiple */
                s->mult_sectors = 0;
                s->status = READY_STAT | SEEK_STAT;
            } else if ((s->nsector & 0xff) != 0 &&
                ((s->nsector & 0xff) > MAX_MULT_SECTORS ||
                 (s->nsector & (s->nsector - 1)) != 0)) {
                ide_abort_command(s);
            } else {
                s->mult_sectors = s->nsector & 0xff;
                s->status = READY_STAT | SEEK_STAT;
            }
            ide_set_irq(s->bus);
            break;
        case WIN_VERIFY_EXT:
	    lba48 = 1;
        case WIN_VERIFY:
        case WIN_VERIFY_ONCE:
            /* do sector number check ? */
	    ide_cmd_lba48_transform(s, lba48);
            s->status = READY_STAT | SEEK_STAT;
            ide_set_irq(s->bus);
            break;
	case WIN_READ_EXT:
	    lba48 = 1;
        case WIN_READ:
        case WIN_READ_ONCE:
            if (!s->bs)
                goto abort_cmd;
	    ide_cmd_lba48_transform(s, lba48);
            s->req_nb_sectors = 1;
            ide_sector_read(s);
            break;
	case WIN_WRITE_EXT:
	    lba48 = 1;
        case WIN_WRITE:
        case WIN_WRITE_ONCE:
        case CFA_WRITE_SECT_WO_ERASE:
        case WIN_WRITE_VERIFY:
	    ide_cmd_lba48_transform(s, lba48);
            s->error = 0;
            s->status = SEEK_STAT | READY_STAT;
            s->req_nb_sectors = 1;
            ide_transfer_start(s, s->io_buffer, 512, ide_sector_write);
            s->media_changed = 1;
            break;
	case WIN_MULTREAD_EXT:
	    lba48 = 1;
        case WIN_MULTREAD:
            if (!s->mult_sectors)
                goto abort_cmd;
	    ide_cmd_lba48_transform(s, lba48);
            s->req_nb_sectors = s->mult_sectors;
            ide_sector_read(s);
            break;
        case WIN_MULTWRITE_EXT:
	    lba48 = 1;
        case WIN_MULTWRITE:
        case CFA_WRITE_MULTI_WO_ERASE:
            if (!s->mult_sectors)
                goto abort_cmd;
	    ide_cmd_lba48_transform(s, lba48);
            s->error = 0;
            s->status = SEEK_STAT | READY_STAT;
            s->req_nb_sectors = s->mult_sectors;
            n = s->nsector;
            if (n > s->req_nb_sectors)
                n = s->req_nb_sectors;
            ide_transfer_start(s, s->io_buffer, 512 * n, ide_sector_write);
            s->media_changed = 1;
            break;
	case WIN_READDMA_EXT:
	    lba48 = 1;
        case WIN_READDMA:
        case WIN_READDMA_ONCE:
            if (!s->bs)
                goto abort_cmd;
	    ide_cmd_lba48_transform(s, lba48);
            ide_sector_read_dma(s);
            break;
	case WIN_WRITEDMA_EXT:
	    lba48 = 1;
        case WIN_WRITEDMA:
        case WIN_WRITEDMA_ONCE:
            if (!s->bs)
                goto abort_cmd;
	    ide_cmd_lba48_transform(s, lba48);
            ide_sector_write_dma(s);
            s->media_changed = 1;
            break;
        case WIN_READ_NATIVE_MAX_EXT:
	    lba48 = 1;
        case WIN_READ_NATIVE_MAX:
	    ide_cmd_lba48_transform(s, lba48);
            ide_set_sector(s, s->nb_sectors - 1);
            s->status = READY_STAT | SEEK_STAT;
            ide_set_irq(s->bus);
            break;
        case WIN_CHECKPOWERMODE1:
        case WIN_CHECKPOWERMODE2:
            s->nsector = 0xff; /* device active or idle */
            s->status = READY_STAT | SEEK_STAT;
            ide_set_irq(s->bus);
            break;
        case WIN_SETFEATURES:
            if (!s->bs)
                goto abort_cmd;
            /* XXX: valid for CDROM ? */
            switch(s->feature) {
            case 0xcc: /* reverting to power-on defaults enable */
            case 0x66: /* reverting to power-on defaults disable */
            case 0x02: /* write cache enable */
            case 0x82: /* write cache disable */
            case 0xaa: /* read look-ahead enable */
            case 0x55: /* read look-ahead disable */
            case 0x05: /* set advanced power management mode */
            case 0x85: /* disable advanced power management mode */
            case 0x69: /* NOP */
            case 0x67: /* NOP */
            case 0x96: /* NOP */
            case 0x9a: /* NOP */
            case 0x42: /* enable Automatic Acoustic Mode */
            case 0xc2: /* disable Automatic Acoustic Mode */
                s->status = READY_STAT | SEEK_STAT;
                ide_set_irq(s->bus);
                break;
            case 0x03: { /* set transfer mode */
		uint8_t val = s->nsector & 0x07;
                uint16_t *identify_data = (uint16_t *)s->identify_data;

		switch (s->nsector >> 3) {
		    case 0x00: /* pio default */
		    case 0x01: /* pio mode */
			put_le16(identify_data + 62,0x07);
			put_le16(identify_data + 63,0x07);
			put_le16(identify_data + 88,0x3f);
			break;
                    case 0x02: /* sigle word dma mode*/
			put_le16(identify_data + 62,0x07 | (1 << (val + 8)));
			put_le16(identify_data + 63,0x07);
			put_le16(identify_data + 88,0x3f);
			break;
		    case 0x04: /* mdma mode */
			put_le16(identify_data + 62,0x07);
			put_le16(identify_data + 63,0x07 | (1 << (val + 8)));
			put_le16(identify_data + 88,0x3f);
			break;
		    case 0x08: /* udma mode */
			put_le16(identify_data + 62,0x07);
			put_le16(identify_data + 63,0x07);
			put_le16(identify_data + 88,0x3f | (1 << (val + 8)));
			break;
		    default:
			goto abort_cmd;
		}
                s->status = READY_STAT | SEEK_STAT;
                ide_set_irq(s->bus);
                break;
	    }
            default:
                goto abort_cmd;
            }
            break;
        case WIN_FLUSH_CACHE:
        case WIN_FLUSH_CACHE_EXT:
            if (s->bs)
                bdrv_aio_flush(s->bs, ide_flush_cb, s);
            else
                ide_flush_cb(s, 0);
            break;
        case WIN_STANDBY:
        case WIN_STANDBY2:
        case WIN_STANDBYNOW1:
        case WIN_STANDBYNOW2:
        case WIN_IDLEIMMEDIATE:
        case CFA_IDLEIMMEDIATE:
        case WIN_SETIDLE1:
        case WIN_SETIDLE2:
        case WIN_SLEEPNOW1:
        case WIN_SLEEPNOW2:
            s->status = READY_STAT;
            ide_set_irq(s->bus);
            break;
        case WIN_SEEK:
            if(s->drive_kind == IDE_CD)
                goto abort_cmd;
            /* XXX: Check that seek is within bounds */
            s->status = READY_STAT | SEEK_STAT;
            ide_set_irq(s->bus);
            break;
            /* ATAPI commands */
        case WIN_PIDENTIFY:
            if (s->drive_kind == IDE_CD) {
                ide_atapi_identify(s);
                s->status = READY_STAT | SEEK_STAT;
                ide_transfer_start(s, s->io_buffer, 512, ide_transfer_stop);
            } else {
                ide_abort_command(s);
            }
            ide_set_irq(s->bus);
            break;
        case WIN_DIAGNOSE:
            ide_set_signature(s);
            if (s->drive_kind == IDE_CD)
                s->status = 0; /* ATAPI spec (v6) section 9.10 defines packet
                                * devices to return a clear status register
                                * with READY_STAT *not* set. */
            else
                s->status = READY_STAT | SEEK_STAT;
            s->error = 0x01; /* Device 0 passed, Device 1 passed or not
                              * present. 
                              */
            ide_set_irq(s->bus);
            break;
        case WIN_SRST:
            if (s->drive_kind != IDE_CD)
                goto abort_cmd;
            ide_set_signature(s);
            s->status = 0x00; /* NOTE: READY is _not_ set */
            s->error = 0x01;
            break;
        case WIN_PACKETCMD:
            if (s->drive_kind != IDE_CD)
                goto abort_cmd;
            /* overlapping commands not supported */
            if (s->feature & 0x02)
                goto abort_cmd;
            s->status = READY_STAT | SEEK_STAT;
            s->atapi_dma = s->feature & 1;
            s->nsector = 1;
            ide_transfer_start(s, s->io_buffer, ATAPI_PACKET_SIZE,
                               ide_atapi_cmd);
            break;
        /* CF-ATA commands */
        case CFA_REQ_EXT_ERROR_CODE:
            if (s->drive_kind != IDE_CFATA)
                goto abort_cmd;
            s->error = 0x09;    /* miscellaneous error */
            s->status = READY_STAT | SEEK_STAT;
            ide_set_irq(s->bus);
            break;
        case CFA_ERASE_SECTORS:
        case CFA_WEAR_LEVEL:
            if (s->drive_kind != IDE_CFATA)
                goto abort_cmd;
            if (val == CFA_WEAR_LEVEL)
                s->nsector = 0;
            if (val == CFA_ERASE_SECTORS)
                s->media_changed = 1;
            s->error = 0x00;
            s->status = READY_STAT | SEEK_STAT;
            ide_set_irq(s->bus);
            break;
        case CFA_TRANSLATE_SECTOR:
            if (s->drive_kind != IDE_CFATA)
                goto abort_cmd;
            s->error = 0x00;
            s->status = READY_STAT | SEEK_STAT;
            memset(s->io_buffer, 0, 0x200);
            s->io_buffer[0x00] = s->hcyl;			/* Cyl MSB */
            s->io_buffer[0x01] = s->lcyl;			/* Cyl LSB */
            s->io_buffer[0x02] = s->select;			/* Head */
            s->io_buffer[0x03] = s->sector;			/* Sector */
            s->io_buffer[0x04] = ide_get_sector(s) >> 16;	/* LBA MSB */
            s->io_buffer[0x05] = ide_get_sector(s) >> 8;	/* LBA */
            s->io_buffer[0x06] = ide_get_sector(s) >> 0;	/* LBA LSB */
            s->io_buffer[0x13] = 0x00;				/* Erase flag */
            s->io_buffer[0x18] = 0x00;				/* Hot count */
            s->io_buffer[0x19] = 0x00;				/* Hot count */
            s->io_buffer[0x1a] = 0x01;				/* Hot count */
            ide_transfer_start(s, s->io_buffer, 0x200, ide_transfer_stop);
            ide_set_irq(s->bus);
            break;
        case CFA_ACCESS_METADATA_STORAGE:
            if (s->drive_kind != IDE_CFATA)
                goto abort_cmd;
            switch (s->feature) {
            case 0x02:	/* Inquiry Metadata Storage */
                ide_cfata_metadata_inquiry(s);
                break;
            case 0x03:	/* Read Metadata Storage */
                ide_cfata_metadata_read(s);
                break;
            case 0x04:	/* Write Metadata Storage */
                ide_cfata_metadata_write(s);
                break;
            default:
                goto abort_cmd;
            }
            ide_transfer_start(s, s->io_buffer, 0x200, ide_transfer_stop);
            s->status = 0x00; /* NOTE: READY is _not_ set */
            ide_set_irq(s->bus);
            break;
        case IBM_SENSE_CONDITION:
            if (s->drive_kind != IDE_CFATA)
                goto abort_cmd;
            switch (s->feature) {
            case 0x01:  /* sense temperature in device */
                s->nsector = 0x50;      /* +20 C */
                break;
            default:
                goto abort_cmd;
            }
            s->status = READY_STAT | SEEK_STAT;
            ide_set_irq(s->bus);
            break;

	case WIN_SMART:
	    if (s->drive_kind == IDE_CD)
		goto abort_cmd;
	    if (s->hcyl != 0xc2 || s->lcyl != 0x4f)
		goto abort_cmd;
	    if (!s->smart_enabled && s->feature != SMART_ENABLE)
		goto abort_cmd;
	    switch (s->feature) {
	    case SMART_DISABLE:
		s->smart_enabled = 0;
		s->status = READY_STAT | SEEK_STAT;
		ide_set_irq(s->bus);
		break;
	    case SMART_ENABLE:
		s->smart_enabled = 1;
		s->status = READY_STAT | SEEK_STAT;
		ide_set_irq(s->bus);
		break;
	    case SMART_ATTR_AUTOSAVE:
		switch (s->sector) {
		case 0x00:
		    s->smart_autosave = 0;
		    break;
		case 0xf1:
		    s->smart_autosave = 1;
		    break;
		default:
		    goto abort_cmd;
		}
		s->status = READY_STAT | SEEK_STAT;
		ide_set_irq(s->bus);
		break;
	    case SMART_STATUS:
		if (!s->smart_errors) {
		    s->hcyl = 0xc2;
		    s->lcyl = 0x4f;
		} else {
		    s->hcyl = 0x2c;
		    s->lcyl = 0xf4;
		}
		s->status = READY_STAT | SEEK_STAT;
		ide_set_irq(s->bus);
		break;
	    case SMART_READ_THRESH:
		memset(s->io_buffer, 0, 0x200);
		s->io_buffer[0] = 0x01; /* smart struct version */
		for (n=0; n<30; n++) {
		    if (smart_attributes[n][0] == 0)
			break;
		    s->io_buffer[2+0+(n*12)] = smart_attributes[n][0];
		    s->io_buffer[2+1+(n*12)] = smart_attributes[n][4];
		}
		for (n=0; n<511; n++) /* checksum */
		    s->io_buffer[511] += s->io_buffer[n];
		s->io_buffer[511] = 0x100 - s->io_buffer[511];
		s->status = READY_STAT | SEEK_STAT;
		ide_transfer_start(s, s->io_buffer, 0x200, ide_transfer_stop);
		ide_set_irq(s->bus);
		break;
	    case SMART_READ_DATA:
		memset(s->io_buffer, 0, 0x200);
		s->io_buffer[0] = 0x01; /* smart struct version */
		for (n=0; n<30; n++) {
		    if (smart_attributes[n][0] == 0)
			break;
		    s->io_buffer[2+0+(n*12)] = smart_attributes[n][0];
		    s->io_buffer[2+1+(n*12)] = smart_attributes[n][1];
		    s->io_buffer[2+3+(n*12)] = smart_attributes[n][2];
		    s->io_buffer[2+4+(n*12)] = smart_attributes[n][3];
		}
		s->io_buffer[362] = 0x02 | (s->smart_autosave?0x80:0x00);
		if (s->smart_selftest_count == 0) {
		    s->io_buffer[363] = 0;
		} else {
		    s->io_buffer[363] = 
			s->smart_selftest_data[3 + 
					       (s->smart_selftest_count - 1) * 
					       24];
		}
		s->io_buffer[364] = 0x20; 
		s->io_buffer[365] = 0x01; 
		/* offline data collection capacity: execute + self-test*/
		s->io_buffer[367] = (1<<4 | 1<<3 | 1); 
		s->io_buffer[368] = 0x03; /* smart capability (1) */
		s->io_buffer[369] = 0x00; /* smart capability (2) */
		s->io_buffer[370] = 0x01; /* error logging supported */
		s->io_buffer[372] = 0x02; /* minutes for poll short test */
		s->io_buffer[373] = 0x36; /* minutes for poll ext test */
		s->io_buffer[374] = 0x01; /* minutes for poll conveyance */

		for (n=0; n<511; n++) 
		    s->io_buffer[511] += s->io_buffer[n];
		s->io_buffer[511] = 0x100 - s->io_buffer[511];
		s->status = READY_STAT | SEEK_STAT;
		ide_transfer_start(s, s->io_buffer, 0x200, ide_transfer_stop);
		ide_set_irq(s->bus);
		break;
	    case SMART_READ_LOG:
		switch (s->sector) {
		case 0x01: /* summary smart error log */
		    memset(s->io_buffer, 0, 0x200);
		    s->io_buffer[0] = 0x01;
		    s->io_buffer[1] = 0x00; /* no error entries */
		    s->io_buffer[452] = s->smart_errors & 0xff;
		    s->io_buffer[453] = (s->smart_errors & 0xff00) >> 8;

		    for (n=0; n<511; n++)
			s->io_buffer[511] += s->io_buffer[n];
		    s->io_buffer[511] = 0x100 - s->io_buffer[511];
		    break;
		case 0x06: /* smart self test log */
		    memset(s->io_buffer, 0, 0x200);
		    s->io_buffer[0] = 0x01; 
		    if (s->smart_selftest_count == 0) {
			s->io_buffer[508] = 0;
		    } else {
			s->io_buffer[508] = s->smart_selftest_count;
			for (n=2; n<506; n++) 
			    s->io_buffer[n] = s->smart_selftest_data[n];
		    }		    
		    for (n=0; n<511; n++)
			s->io_buffer[511] += s->io_buffer[n];
		    s->io_buffer[511] = 0x100 - s->io_buffer[511];
		    break;
		default:
		    goto abort_cmd;
		}
		s->status = READY_STAT | SEEK_STAT;
		ide_transfer_start(s, s->io_buffer, 0x200, ide_transfer_stop);
		ide_set_irq(s->bus);
		break;
	    case SMART_EXECUTE_OFFLINE:
		switch (s->sector) {
		case 0: /* off-line routine */
		case 1: /* short self test */
		case 2: /* extended self test */
		    s->smart_selftest_count++;
		    if(s->smart_selftest_count > 21)
			s->smart_selftest_count = 0;
		    n = 2 + (s->smart_selftest_count - 1) * 24;
		    s->smart_selftest_data[n] = s->sector;
		    s->smart_selftest_data[n+1] = 0x00; /* OK and finished */
		    s->smart_selftest_data[n+2] = 0x34; /* hour count lsb */
		    s->smart_selftest_data[n+3] = 0x12; /* hour count msb */
		    s->status = READY_STAT | SEEK_STAT;
		    ide_set_irq(s->bus);
		    break;
		default:
		    goto abort_cmd;
		}
		break;
	    default:
		goto abort_cmd;
	    }
	    break;
        default:
        abort_cmd:
            ide_abort_command(s);
            ide_set_irq(s->bus);
            break;
        }
    }
}

uint32_t ide_ioport_read(void *opaque, uint32_t addr1)
{
    IDEBus *bus = opaque;
    IDEState *s = idebus_active_if(bus);
    uint32_t addr;
    int ret, hob;

    addr = addr1 & 7;
    /* FIXME: HOB readback uses bit 7, but it's always set right now */
    //hob = s->select & (1 << 7);
    hob = 0;
    switch(addr) {
    case 0:
        ret = 0xff;
        break;
    case 1:
        if ((!bus->ifs[0].bs && !bus->ifs[1].bs) ||
            (s != bus->ifs && !s->bs))
            ret = 0;
        else if (!hob)
            ret = s->error;
	else
	    ret = s->hob_feature;
        break;
    case 2:
        if (!bus->ifs[0].bs && !bus->ifs[1].bs)
            ret = 0;
        else if (!hob)
            ret = s->nsector & 0xff;
	else
	    ret = s->hob_nsector;
        break;
    case 3:
        if (!bus->ifs[0].bs && !bus->ifs[1].bs)
            ret = 0;
        else if (!hob)
            ret = s->sector;
	else
	    ret = s->hob_sector;
        break;
    case 4:
        if (!bus->ifs[0].bs && !bus->ifs[1].bs)
            ret = 0;
        else if (!hob)
            ret = s->lcyl;
	else
	    ret = s->hob_lcyl;
        break;
    case 5:
        if (!bus->ifs[0].bs && !bus->ifs[1].bs)
            ret = 0;
        else if (!hob)
            ret = s->hcyl;
	else
	    ret = s->hob_hcyl;
        break;
    case 6:
        if (!bus->ifs[0].bs && !bus->ifs[1].bs)
            ret = 0;
        else
            ret = s->select;
        break;
    default:
    case 7:
        if ((!bus->ifs[0].bs && !bus->ifs[1].bs) ||
            (s != bus->ifs && !s->bs))
            ret = 0;
        else
            ret = s->status;
        qemu_irq_lower(bus->irq);
        break;
    }
#ifdef DEBUG_IDE
    printf("ide: read addr=0x%x val=%02x\n", addr1, ret);
#endif
    return ret;
}

uint32_t ide_status_read(void *opaque, uint32_t addr)
{
    IDEBus *bus = opaque;
    IDEState *s = idebus_active_if(bus);
    int ret;

    if ((!bus->ifs[0].bs && !bus->ifs[1].bs) ||
        (s != bus->ifs && !s->bs))
        ret = 0;
    else
        ret = s->status;
#ifdef DEBUG_IDE
    printf("ide: read status addr=0x%x val=%02x\n", addr, ret);
#endif
    return ret;
}

void ide_cmd_write(void *opaque, uint32_t addr, uint32_t val)
{
    IDEBus *bus = opaque;
    IDEState *s;
    int i;

#ifdef DEBUG_IDE
    printf("ide: write control addr=0x%x val=%02x\n", addr, val);
#endif
    /* common for both drives */
    if (!(bus->cmd & IDE_CMD_RESET) &&
        (val & IDE_CMD_RESET)) {
        /* reset low to high */
        for(i = 0;i < 2; i++) {
            s = &bus->ifs[i];
            s->status = BUSY_STAT | SEEK_STAT;
            s->error = 0x01;
        }
    } else if ((bus->cmd & IDE_CMD_RESET) &&
               !(val & IDE_CMD_RESET)) {
        /* high to low */
        for(i = 0;i < 2; i++) {
            s = &bus->ifs[i];
            if (s->drive_kind == IDE_CD)
                s->status = 0x00; /* NOTE: READY is _not_ set */
            else
                s->status = READY_STAT | SEEK_STAT;
            ide_set_signature(s);
        }
    }

    bus->cmd = val;
}

void ide_data_writew(void *opaque, uint32_t addr, uint32_t val)
{
    IDEBus *bus = opaque;
    IDEState *s = idebus_active_if(bus);
    uint8_t *p;

    /* PIO data access allowed only when DRQ bit is set */
    if (!(s->status & DRQ_STAT))
        return;

    p = s->data_ptr;
    *(uint16_t *)p = le16_to_cpu(val);
    p += 2;
    s->data_ptr = p;
    if (p >= s->data_end)
        s->end_transfer_func(s);
}

uint32_t ide_data_readw(void *opaque, uint32_t addr)
{
    IDEBus *bus = opaque;
    IDEState *s = idebus_active_if(bus);
    uint8_t *p;
    int ret;

    /* PIO data access allowed only when DRQ bit is set */
    if (!(s->status & DRQ_STAT))
        return 0;

    p = s->data_ptr;
    ret = cpu_to_le16(*(uint16_t *)p);
    p += 2;
    s->data_ptr = p;
    if (p >= s->data_end)
        s->end_transfer_func(s);
    return ret;
}

void ide_data_writel(void *opaque, uint32_t addr, uint32_t val)
{
    IDEBus *bus = opaque;
    IDEState *s = idebus_active_if(bus);
    uint8_t *p;

    /* PIO data access allowed only when DRQ bit is set */
    if (!(s->status & DRQ_STAT))
        return;

    p = s->data_ptr;
    *(uint32_t *)p = le32_to_cpu(val);
    p += 4;
    s->data_ptr = p;
    if (p >= s->data_end)
        s->end_transfer_func(s);
}

uint32_t ide_data_readl(void *opaque, uint32_t addr)
{
    IDEBus *bus = opaque;
    IDEState *s = idebus_active_if(bus);
    uint8_t *p;
    int ret;

    /* PIO data access allowed only when DRQ bit is set */
    if (!(s->status & DRQ_STAT))
        return 0;

    p = s->data_ptr;
    ret = cpu_to_le32(*(uint32_t *)p);
    p += 4;
    s->data_ptr = p;
    if (p >= s->data_end)
        s->end_transfer_func(s);
    return ret;
}

static void ide_dummy_transfer_stop(IDEState *s)
{
    s->data_ptr = s->io_buffer;
    s->data_end = s->io_buffer;
    s->io_buffer[0] = 0xff;
    s->io_buffer[1] = 0xff;
    s->io_buffer[2] = 0xff;
    s->io_buffer[3] = 0xff;
}

static void ide_reset(IDEState *s)
{
#ifdef DEBUG_IDE
    printf("ide: reset\n");
#endif
    if (s->drive_kind == IDE_CFATA)
        s->mult_sectors = 0;
    else
        s->mult_sectors = MAX_MULT_SECTORS;
    /* ide regs */
    s->feature = 0;
    s->error = 0;
    s->nsector = 0;
    s->sector = 0;
    s->lcyl = 0;
    s->hcyl = 0;

    /* lba48 */
    s->hob_feature = 0;
    s->hob_sector = 0;
    s->hob_nsector = 0;
    s->hob_lcyl = 0;
    s->hob_hcyl = 0;

    s->select = 0xa0;
    s->status = READY_STAT | SEEK_STAT;

    s->lba48 = 0;

    /* ATAPI specific */
    s->sense_key = 0;
    s->asc = 0;
    s->cdrom_changed = 0;
    s->packet_transfer_size = 0;
    s->elementary_transfer_size = 0;
    s->io_buffer_index = 0;
    s->cd_sector_size = 0;
    s->atapi_dma = 0;
    /* ATA DMA state */
    s->io_buffer_size = 0;
    s->req_nb_sectors = 0;

    ide_set_signature(s);
    /* init the transfer handler so that 0xffff is returned on data
       accesses */
    s->end_transfer_func = ide_dummy_transfer_stop;
    ide_dummy_transfer_stop(s);
    s->media_changed = 0;
}

void ide_bus_reset(IDEBus *bus)
{
    bus->unit = 0;
    bus->cmd = 0;
    ide_reset(&bus->ifs[0]);
    ide_reset(&bus->ifs[1]);
    ide_clear_hob(bus);
}

int ide_init_drive(IDEState *s, BlockDriverState *bs,
                   const char *version, const char *serial)
{
    int cylinders, heads, secs;
    uint64_t nb_sectors;

    s->bs = bs;
    bdrv_get_geometry(bs, &nb_sectors);
    bdrv_guess_geometry(bs, &cylinders, &heads, &secs);
    s->cylinders = cylinders;
    s->heads = heads;
    s->sectors = secs;
    s->nb_sectors = nb_sectors;
    /* The SMART values should be preserved across power cycles
       but they aren't.  */
    s->smart_enabled = 1;
    s->smart_autosave = 1;
    s->smart_errors = 0;
    s->smart_selftest_count = 0;
    if (bdrv_get_type_hint(bs) == BDRV_TYPE_CDROM) {
        s->drive_kind = IDE_CD;
        bdrv_set_change_cb(bs, cdrom_change_cb, s);
    } else {
        if (bdrv_is_read_only(bs)) {
            error_report("Can't use a read-only drive");
            return -1;
        }
    }
    if (serial) {
        strncpy(s->drive_serial_str, serial, sizeof(s->drive_serial_str));
    } else {
        snprintf(s->drive_serial_str, sizeof(s->drive_serial_str),
                 "QM%05d", s->drive_serial);
    }
    if (version) {
        pstrcpy(s->version, sizeof(s->version), version);
    } else {
        pstrcpy(s->version, sizeof(s->version), QEMU_VERSION);
    }
    ide_reset(s);
    bdrv_set_removable(bs, s->drive_kind == IDE_CD);
    return 0;
}

static void ide_init1(IDEBus *bus, int unit)
{
    static int drive_serial = 1;
    IDEState *s = &bus->ifs[unit];

    s->bus = bus;
    s->unit = unit;
    s->drive_serial = drive_serial++;
    s->io_buffer = qemu_blockalign(s->bs, IDE_DMA_BUF_SECTORS*512 + 4);
    s->io_buffer_total_len = IDE_DMA_BUF_SECTORS*512 + 4;
    s->smart_selftest_data = qemu_blockalign(s->bs, 512);
    s->sector_write_timer = qemu_new_timer(vm_clock,
                                           ide_sector_write_timer_cb, s);
}

void ide_init2(IDEBus *bus, qemu_irq irq)
{
    int i;

    for(i = 0; i < 2; i++) {
        ide_init1(bus, i);
        ide_reset(&bus->ifs[i]);
    }
    bus->irq = irq;
}

/* TODO convert users to qdev and remove */
void ide_init2_with_non_qdev_drives(IDEBus *bus, DriveInfo *hd0,
                                    DriveInfo *hd1, qemu_irq irq)
{
    int i;
    DriveInfo *dinfo;

    for(i = 0; i < 2; i++) {
        dinfo = i == 0 ? hd0 : hd1;
        ide_init1(bus, i);
        if (dinfo) {
            if (ide_init_drive(&bus->ifs[i], dinfo->bdrv, NULL,
                               *dinfo->serial ? dinfo->serial : NULL) < 0) {
                error_report("Can't set up IDE drive %s", dinfo->id);
                exit(1);
            }
        } else {
            ide_reset(&bus->ifs[i]);
        }
    }
    bus->irq = irq;
}

void ide_init_ioport(IDEBus *bus, int iobase, int iobase2)
{
    register_ioport_write(iobase, 8, 1, ide_ioport_write, bus);
    register_ioport_read(iobase, 8, 1, ide_ioport_read, bus);
    if (iobase2) {
        register_ioport_read(iobase2, 1, 1, ide_status_read, bus);
        register_ioport_write(iobase2, 1, 1, ide_cmd_write, bus);
    }

    /* data ports */
    register_ioport_write(iobase, 2, 2, ide_data_writew, bus);
    register_ioport_read(iobase, 2, 2, ide_data_readw, bus);
    register_ioport_write(iobase, 4, 4, ide_data_writel, bus);
    register_ioport_read(iobase, 4, 4, ide_data_readl, bus);
}

static bool is_identify_set(void *opaque, int version_id)
{
    IDEState *s = opaque;

    return s->identify_set != 0;
}

static EndTransferFunc* transfer_end_table[] = {
        ide_sector_read,
        ide_sector_write,
        ide_transfer_stop,
        ide_atapi_cmd_reply_end,
        ide_atapi_cmd,
};

static int transfer_end_table_idx(EndTransferFunc *fn)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(transfer_end_table); i++)
        if (transfer_end_table[i] == fn)
            return i;

    return -1;
}

static int ide_drive_post_load(void *opaque, int version_id)
{
    IDEState *s = opaque;

    if (version_id < 3) {
        if (s->sense_key == SENSE_UNIT_ATTENTION &&
            s->asc == ASC_MEDIUM_MAY_HAVE_CHANGED) {
            s->cdrom_changed = 1;
        }
    }

    if (s->cur_io_buffer_len) {
        s->end_transfer_func = transfer_end_table[s->end_transfer_fn_idx];
        s->data_ptr = s->io_buffer + s->cur_io_buffer_offset;
        s->data_end = s->data_ptr + s->cur_io_buffer_len;
    }
        
    return 0;
}

static void ide_drive_pre_save(void *opaque)
{
    IDEState *s = opaque;
    int idx;

    s->cur_io_buffer_len = 0;

    if (!(s->status & DRQ_STAT))
        return;

    s->cur_io_buffer_offset = s->data_ptr - s->io_buffer;
    s->cur_io_buffer_len = s->data_end - s->data_ptr;

    idx = transfer_end_table_idx(s->end_transfer_func);
    if (idx == -1) {
        fprintf(stderr, "%s: invalid end_transfer_func for DRQ_STAT\n",
                        __func__);
        s->end_transfer_fn_idx = 2;
    } else {
        s->end_transfer_fn_idx = idx;
    }
}

const VMStateDescription vmstate_ide_drive = {
    .name = "ide_drive",
    .version_id = 4,
    .minimum_version_id = 0,
    .minimum_version_id_old = 0,
    .pre_save = ide_drive_pre_save,
    .post_load = ide_drive_post_load,
    .fields      = (VMStateField []) {
        VMSTATE_INT32(mult_sectors, IDEState),
        VMSTATE_INT32(identify_set, IDEState),
        VMSTATE_BUFFER_TEST(identify_data, IDEState, is_identify_set),
        VMSTATE_UINT8(feature, IDEState),
        VMSTATE_UINT8(error, IDEState),
        VMSTATE_UINT32(nsector, IDEState),
        VMSTATE_UINT8(sector, IDEState),
        VMSTATE_UINT8(lcyl, IDEState),
        VMSTATE_UINT8(hcyl, IDEState),
        VMSTATE_UINT8(hob_feature, IDEState),
        VMSTATE_UINT8(hob_sector, IDEState),
        VMSTATE_UINT8(hob_nsector, IDEState),
        VMSTATE_UINT8(hob_lcyl, IDEState),
        VMSTATE_UINT8(hob_hcyl, IDEState),
        VMSTATE_UINT8(select, IDEState),
        VMSTATE_UINT8(status, IDEState),
        VMSTATE_UINT8(lba48, IDEState),
        VMSTATE_UINT8(sense_key, IDEState),
        VMSTATE_UINT8(asc, IDEState),
        VMSTATE_UINT8_V(cdrom_changed, IDEState, 3),
        VMSTATE_INT32_V(req_nb_sectors, IDEState, 4),
        VMSTATE_VARRAY_INT32(io_buffer, IDEState, io_buffer_total_len, 4,
			     vmstate_info_uint8, uint8_t),
        VMSTATE_INT32_V(cur_io_buffer_offset, IDEState, 4),
        VMSTATE_INT32_V(cur_io_buffer_len, IDEState, 4),
        VMSTATE_UINT8_V(end_transfer_fn_idx, IDEState, 4),
        VMSTATE_INT32_V(elementary_transfer_size, IDEState, 4),
        VMSTATE_INT32_V(packet_transfer_size, IDEState, 4),
        VMSTATE_END_OF_LIST()
    }
};

const VMStateDescription vmstate_ide_bus = {
    .name = "ide_bus",
    .version_id = 1,
    .minimum_version_id = 1,
    .minimum_version_id_old = 1,
    .fields      = (VMStateField []) {
        VMSTATE_UINT8(cmd, IDEBus),
        VMSTATE_UINT8(unit, IDEBus),
        VMSTATE_END_OF_LIST()
    }
};

/***********************************************************/
/* PCI IDE definitions */

static void ide_dma_start(IDEState *s, BlockDriverCompletionFunc *dma_cb)
{
    BMDMAState *bm = s->bus->bmdma;
    if(!bm)
        return;
    bm->unit = s->unit;
    bm->dma_cb = dma_cb;
    bm->cur_prd_last = 0;
    bm->cur_prd_addr = 0;
    bm->cur_prd_len = 0;
    bm->sector_num = ide_get_sector(s);
    bm->nsector = s->nsector;
    if (bm->status & BM_STATUS_DMAING) {
        bm->dma_cb(bm, 0);
    }
}

static void ide_dma_restart(IDEState *s, int is_read)
{
    BMDMAState *bm = s->bus->bmdma;
    ide_set_sector(s, bm->sector_num);
    s->io_buffer_index = 0;
    s->io_buffer_size = 0;
    s->nsector = bm->nsector;
    bm->cur_addr = bm->addr;

    if (is_read) {
        bm->dma_cb = ide_read_dma_cb;
    } else {
        bm->dma_cb = ide_write_dma_cb;
    }

    ide_dma_start(s, bm->dma_cb);
}

void ide_dma_cancel(BMDMAState *bm)
{
    if (bm->status & BM_STATUS_DMAING) {
        if (bm->aiocb) {
#ifdef DEBUG_AIO
            printf("aio_cancel\n");
#endif
            bdrv_aio_cancel(bm->aiocb);
            bm->aiocb = NULL;
        }
        bm->status &= ~BM_STATUS_DMAING;
        /* cancel DMA request */
        bm->unit = -1;
        bm->dma_cb = NULL;
    }
}

void ide_dma_reset(BMDMAState *bm)
{
#ifdef DEBUG_IDE
    printf("ide: dma_reset\n");
#endif
    ide_dma_cancel(bm);
    bm->cmd = 0;
    bm->status = 0;
    bm->addr = 0;
    bm->cur_addr = 0;
    bm->cur_prd_last = 0;
    bm->cur_prd_addr = 0;
    bm->cur_prd_len = 0;
    bm->sector_num = 0;
    bm->nsector = 0;
}