moved IDE driver to ide.c

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@445 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 1421 insertions, 0 deletions

diff --git a/hw/ide.c b/hw/ide.c
new file mode 100644
index 0000000000..96e43da5cc
--- /dev/null
+++ b/hw/ide.c
@@ -0,0 +1,1421 @@
+/*
+ * QEMU IDE disk and CD-ROM Emulator
+ * 
+ * Copyright (c) 2003 Fabrice Bellard
+ * 
+ * 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 <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <getopt.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <time.h>
+#include <sys/time.h>
+#include <malloc.h>
+#include <termios.h>
+#include <sys/poll.h>
+#include <errno.h>
+#include <sys/wait.h>
+#include <netinet/in.h>
+
+#include "cpu.h"
+#include "exec-all.h"
+
+#include "vl.h"
+
+#define NO_THUNK_TYPE_SIZE
+#include "thunk.h"
+
+/* debug IDE devices */
+//#define DEBUG_IDE
+//#define DEBUG_IDE_ATAPI
+
+/* Bits of HD_STATUS */
+#define ERR_STAT		0x01
+#define INDEX_STAT		0x02
+#define ECC_STAT		0x04	/* Corrected error */
+#define DRQ_STAT		0x08
+#define SEEK_STAT		0x10
+#define SRV_STAT		0x10
+#define WRERR_STAT		0x20
+#define READY_STAT		0x40
+#define BUSY_STAT		0x80
+
+/* Bits for HD_ERROR */
+#define MARK_ERR		0x01	/* Bad address mark */
+#define TRK0_ERR		0x02	/* couldn't find track 0 */
+#define ABRT_ERR		0x04	/* Command aborted */
+#define MCR_ERR			0x08	/* media change request */
+#define ID_ERR			0x10	/* ID field not found */
+#define MC_ERR			0x20	/* media changed */
+#define ECC_ERR			0x40	/* Uncorrectable ECC error */
+#define BBD_ERR			0x80	/* pre-EIDE meaning:  block marked bad */
+#define ICRC_ERR		0x80	/* new meaning:  CRC error during transfer */
+
+/* Bits of HD_NSECTOR */
+#define CD			0x01
+#define IO			0x02
+#define REL			0x04
+#define TAG_MASK		0xf8
+
+#define IDE_CMD_RESET           0x04
+#define IDE_CMD_DISABLE_IRQ     0x02
+
+/* ATA/ATAPI Commands pre T13 Spec */
+#define WIN_NOP				0x00
+/*
+ *	0x01->0x02 Reserved
+ */
+#define CFA_REQ_EXT_ERROR_CODE		0x03 /* CFA Request Extended Error Code */
+/*
+ *	0x04->0x07 Reserved
+ */
+#define WIN_SRST			0x08 /* ATAPI soft reset command */
+#define WIN_DEVICE_RESET		0x08
+/*
+ *	0x09->0x0F Reserved
+ */
+#define WIN_RECAL			0x10
+#define WIN_RESTORE			WIN_RECAL
+/*
+ *	0x10->0x1F Reserved
+ */
+#define WIN_READ			0x20 /* 28-Bit */
+#define WIN_READ_ONCE			0x21 /* 28-Bit without retries */
+#define WIN_READ_LONG			0x22 /* 28-Bit */
+#define WIN_READ_LONG_ONCE		0x23 /* 28-Bit without retries */
+#define WIN_READ_EXT			0x24 /* 48-Bit */
+#define WIN_READDMA_EXT			0x25 /* 48-Bit */
+#define WIN_READDMA_QUEUED_EXT		0x26 /* 48-Bit */
+#define WIN_READ_NATIVE_MAX_EXT		0x27 /* 48-Bit */
+/*
+ *	0x28
+ */
+#define WIN_MULTREAD_EXT		0x29 /* 48-Bit */
+/*
+ *	0x2A->0x2F Reserved
+ */
+#define WIN_WRITE			0x30 /* 28-Bit */
+#define WIN_WRITE_ONCE			0x31 /* 28-Bit without retries */
+#define WIN_WRITE_LONG			0x32 /* 28-Bit */
+#define WIN_WRITE_LONG_ONCE		0x33 /* 28-Bit without retries */
+#define WIN_WRITE_EXT			0x34 /* 48-Bit */
+#define WIN_WRITEDMA_EXT		0x35 /* 48-Bit */
+#define WIN_WRITEDMA_QUEUED_EXT		0x36 /* 48-Bit */
+#define WIN_SET_MAX_EXT			0x37 /* 48-Bit */
+#define CFA_WRITE_SECT_WO_ERASE		0x38 /* CFA Write Sectors without erase */
+#define WIN_MULTWRITE_EXT		0x39 /* 48-Bit */
+/*
+ *	0x3A->0x3B Reserved
+ */
+#define WIN_WRITE_VERIFY		0x3C /* 28-Bit */
+/*
+ *	0x3D->0x3F Reserved
+ */
+#define WIN_VERIFY			0x40 /* 28-Bit - Read Verify Sectors */
+#define WIN_VERIFY_ONCE			0x41 /* 28-Bit - without retries */
+#define WIN_VERIFY_EXT			0x42 /* 48-Bit */
+/*
+ *	0x43->0x4F Reserved
+ */
+#define WIN_FORMAT			0x50
+/*
+ *	0x51->0x5F Reserved
+ */
+#define WIN_INIT			0x60
+/*
+ *	0x61->0x5F Reserved
+ */
+#define WIN_SEEK			0x70 /* 0x70-0x7F Reserved */
+#define CFA_TRANSLATE_SECTOR		0x87 /* CFA Translate Sector */
+#define WIN_DIAGNOSE			0x90
+#define WIN_SPECIFY			0x91 /* set drive geometry translation */
+#define WIN_DOWNLOAD_MICROCODE		0x92
+#define WIN_STANDBYNOW2			0x94
+#define WIN_STANDBY2			0x96
+#define WIN_SETIDLE2			0x97
+#define WIN_CHECKPOWERMODE2		0x98
+#define WIN_SLEEPNOW2			0x99
+/*
+ *	0x9A VENDOR
+ */
+#define WIN_PACKETCMD			0xA0 /* Send a packet command. */
+#define WIN_PIDENTIFY			0xA1 /* identify ATAPI device	*/
+#define WIN_QUEUED_SERVICE		0xA2
+#define WIN_SMART			0xB0 /* self-monitoring and reporting */
+#define CFA_ERASE_SECTORS       	0xC0
+#define WIN_MULTREAD			0xC4 /* read sectors using multiple mode*/
+#define WIN_MULTWRITE			0xC5 /* write sectors using multiple mode */
+#define WIN_SETMULT			0xC6 /* enable/disable multiple mode */
+#define WIN_READDMA_QUEUED		0xC7 /* read sectors using Queued DMA transfers */
+#define WIN_READDMA			0xC8 /* read sectors using DMA transfers */
+#define WIN_READDMA_ONCE		0xC9 /* 28-Bit - without retries */
+#define WIN_WRITEDMA			0xCA /* write sectors using DMA transfers */
+#define WIN_WRITEDMA_ONCE		0xCB /* 28-Bit - without retries */
+#define WIN_WRITEDMA_QUEUED		0xCC /* write sectors using Queued DMA transfers */
+#define CFA_WRITE_MULTI_WO_ERASE	0xCD /* CFA Write multiple without erase */
+#define WIN_GETMEDIASTATUS		0xDA	
+#define WIN_ACKMEDIACHANGE		0xDB /* ATA-1, ATA-2 vendor */
+#define WIN_POSTBOOT			0xDC
+#define WIN_PREBOOT			0xDD
+#define WIN_DOORLOCK			0xDE /* lock door on removable drives */
+#define WIN_DOORUNLOCK			0xDF /* unlock door on removable drives */
+#define WIN_STANDBYNOW1			0xE0
+#define WIN_IDLEIMMEDIATE		0xE1 /* force drive to become "ready" */
+#define WIN_STANDBY             	0xE2 /* Set device in Standby Mode */
+#define WIN_SETIDLE1			0xE3
+#define WIN_READ_BUFFER			0xE4 /* force read only 1 sector */
+#define WIN_CHECKPOWERMODE1		0xE5
+#define WIN_SLEEPNOW1			0xE6
+#define WIN_FLUSH_CACHE			0xE7
+#define WIN_WRITE_BUFFER		0xE8 /* force write only 1 sector */
+#define WIN_WRITE_SAME			0xE9 /* read ata-2 to use */
+	/* SET_FEATURES 0x22 or 0xDD */
+#define WIN_FLUSH_CACHE_EXT		0xEA /* 48-Bit */
+#define WIN_IDENTIFY			0xEC /* ask drive to identify itself	*/
+#define WIN_MEDIAEJECT			0xED
+#define WIN_IDENTIFY_DMA		0xEE /* same as WIN_IDENTIFY, but DMA */
+#define WIN_SETFEATURES			0xEF /* set special drive features */
+#define EXABYTE_ENABLE_NEST		0xF0
+#define WIN_SECURITY_SET_PASS		0xF1
+#define WIN_SECURITY_UNLOCK		0xF2
+#define WIN_SECURITY_ERASE_PREPARE	0xF3
+#define WIN_SECURITY_ERASE_UNIT		0xF4
+#define WIN_SECURITY_FREEZE_LOCK	0xF5
+#define WIN_SECURITY_DISABLE		0xF6
+#define WIN_READ_NATIVE_MAX		0xF8 /* return the native maximum address */
+#define WIN_SET_MAX			0xF9
+#define DISABLE_SEAGATE			0xFB
+
+/* set to 1 set disable mult support */
+#define MAX_MULT_SECTORS 8
+
+/* ATAPI defines */
+
+#define ATAPI_PACKET_SIZE 12
+
+/* The generic packet command opcodes for CD/DVD Logical Units,
+ * From Table 57 of the SFF8090 Ver. 3 (Mt. Fuji) draft standard. */
+#define GPCMD_BLANK			    0xa1
+#define GPCMD_CLOSE_TRACK		    0x5b
+#define GPCMD_FLUSH_CACHE		    0x35
+#define GPCMD_FORMAT_UNIT		    0x04
+#define GPCMD_GET_CONFIGURATION		    0x46
+#define GPCMD_GET_EVENT_STATUS_NOTIFICATION 0x4a
+#define GPCMD_GET_PERFORMANCE		    0xac
+#define GPCMD_INQUIRY			    0x12
+#define GPCMD_LOAD_UNLOAD		    0xa6
+#define GPCMD_MECHANISM_STATUS		    0xbd
+#define GPCMD_MODE_SELECT_10		    0x55
+#define GPCMD_MODE_SENSE_10		    0x5a
+#define GPCMD_PAUSE_RESUME		    0x4b
+#define GPCMD_PLAY_AUDIO_10		    0x45
+#define GPCMD_PLAY_AUDIO_MSF		    0x47
+#define GPCMD_PLAY_AUDIO_TI		    0x48
+#define GPCMD_PLAY_CD			    0xbc
+#define GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL  0x1e
+#define GPCMD_READ_10			    0x28
+#define GPCMD_READ_12			    0xa8
+#define GPCMD_READ_CDVD_CAPACITY	    0x25
+#define GPCMD_READ_CD			    0xbe
+#define GPCMD_READ_CD_MSF		    0xb9
+#define GPCMD_READ_DISC_INFO		    0x51
+#define GPCMD_READ_DVD_STRUCTURE	    0xad
+#define GPCMD_READ_FORMAT_CAPACITIES	    0x23
+#define GPCMD_READ_HEADER		    0x44
+#define GPCMD_READ_TRACK_RZONE_INFO	    0x52
+#define GPCMD_READ_SUBCHANNEL		    0x42
+#define GPCMD_READ_TOC_PMA_ATIP		    0x43
+#define GPCMD_REPAIR_RZONE_TRACK	    0x58
+#define GPCMD_REPORT_KEY		    0xa4
+#define GPCMD_REQUEST_SENSE		    0x03
+#define GPCMD_RESERVE_RZONE_TRACK	    0x53
+#define GPCMD_SCAN			    0xba
+#define GPCMD_SEEK			    0x2b
+#define GPCMD_SEND_DVD_STRUCTURE	    0xad
+#define GPCMD_SEND_EVENT		    0xa2
+#define GPCMD_SEND_KEY			    0xa3
+#define GPCMD_SEND_OPC			    0x54
+#define GPCMD_SET_READ_AHEAD		    0xa7
+#define GPCMD_SET_STREAMING		    0xb6
+#define GPCMD_START_STOP_UNIT		    0x1b
+#define GPCMD_STOP_PLAY_SCAN		    0x4e
+#define GPCMD_TEST_UNIT_READY		    0x00
+#define GPCMD_VERIFY_10			    0x2f
+#define GPCMD_WRITE_10			    0x2a
+#define GPCMD_WRITE_AND_VERIFY_10	    0x2e
+/* This is listed as optional in ATAPI 2.6, but is (curiously) 
+ * missing from Mt. Fuji, Table 57.  It _is_ mentioned in Mt. Fuji
+ * Table 377 as an MMC command for SCSi devices though...  Most ATAPI
+ * drives support it. */
+#define GPCMD_SET_SPEED			    0xbb
+/* This seems to be a SCSI specific CD-ROM opcode 
+ * to play data at track/index */
+#define GPCMD_PLAYAUDIO_TI		    0x48
+/*
+ * From MS Media Status Notification Support Specification. For
+ * older drives only.
+ */
+#define GPCMD_GET_MEDIA_STATUS		    0xda
+
+/* Mode page codes for mode sense/set */
+#define GPMODE_R_W_ERROR_PAGE		0x01
+#define GPMODE_WRITE_PARMS_PAGE		0x05
+#define GPMODE_AUDIO_CTL_PAGE		0x0e
+#define GPMODE_POWER_PAGE		0x1a
+#define GPMODE_FAULT_FAIL_PAGE		0x1c
+#define GPMODE_TO_PROTECT_PAGE		0x1d
+#define GPMODE_CAPABILITIES_PAGE	0x2a
+#define GPMODE_ALL_PAGES		0x3f
+/* Not in Mt. Fuji, but in ATAPI 2.6 -- depricated now in favor
+ * of MODE_SENSE_POWER_PAGE */
+#define GPMODE_CDROM_PAGE		0x0d
+
+#define ATAPI_INT_REASON_CD             0x01 /* 0 = data transfer */
+#define ATAPI_INT_REASON_IO             0x02 /* 1 = transfer to the host */
+#define ATAPI_INT_REASON_REL            0x04
+#define ATAPI_INT_REASON_TAG            0xf8
+
+/* same constants as bochs */
+#define ASC_LOGICAL_BLOCK_OOR                0x21
+#define ASC_INV_FIELD_IN_CMD_PACKET          0x24
+#define ASC_MEDIUM_NOT_PRESENT               0x3a
+#define ASC_SAVING_PARAMETERS_NOT_SUPPORTED  0x39
+
+#define SENSE_NONE            0
+#define SENSE_NOT_READY       2
+#define SENSE_ILLEGAL_REQUEST 5
+#define SENSE_UNIT_ATTENTION  6
+
+struct IDEState;
+
+typedef void EndTransferFunc(struct IDEState *);
+
+typedef struct IDEState {
+    /* ide config */
+    int is_cdrom;
+    int cdrom_locked;
+    int cylinders, heads, sectors;
+    int64_t nb_sectors;
+    int mult_sectors;
+    int irq;
+    /* ide regs */
+    uint8_t feature;
+    uint8_t error;
+    uint16_t nsector; /* 0 is 256 to ease computations */
+    uint8_t sector;
+    uint8_t lcyl;
+    uint8_t hcyl;
+    uint8_t select;
+    uint8_t status;
+    /* 0x3f6 command, only meaningful for drive 0 */
+    uint8_t cmd;
+    /* depends on bit 4 in select, only meaningful for drive 0 */
+    struct IDEState *cur_drive; 
+    BlockDriverState *bs;
+    /* ATAPI specific */
+    uint8_t sense_key;
+    uint8_t asc;
+    int packet_transfer_size;
+    int elementary_transfer_size;
+    int io_buffer_index;
+    int lba;
+    /* transfer handling */
+    int req_nb_sectors; /* number of sectors per interrupt */
+    EndTransferFunc *end_transfer_func;
+    uint8_t *data_ptr;
+    uint8_t *data_end;
+    uint8_t io_buffer[MAX_MULT_SECTORS*512 + 4];
+} IDEState;
+
+IDEState ide_state[MAX_DISKS];
+IDEState *ide_table[0x400 >> 3];
+
+static inline IDEState *get_ide_interface(uint32_t addr)
+{
+    return ide_table[addr >> 3];
+}
+
+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 = ' ';
+        *(char *)((long)str ^ 1) = v;
+        str++;
+    }
+}
+
+static void ide_identify(IDEState *s)
+{
+    uint16_t *p;
+    unsigned int oldsize;
+
+    memset(s->io_buffer, 0, 512);
+    p = (uint16_t *)s->io_buffer;
+    stw_raw(p + 0, 0x0040);
+    stw_raw(p + 1, s->cylinders); 
+    stw_raw(p + 3, s->heads);
+    stw_raw(p + 4, 512 * s->sectors); /* sectors */
+    stw_raw(p + 5, 512); /* sector size */
+    stw_raw(p + 6, s->sectors); 
+    padstr((uint8_t *)(p + 10), "QM00001", 20); /* serial number */
+    stw_raw(p + 20, 3); /* buffer type */
+    stw_raw(p + 21, 512); /* cache size in sectors */
+    stw_raw(p + 22, 4); /* ecc bytes */
+    padstr((uint8_t *)(p + 23), QEMU_VERSION, 8); /* firmware version */
+    padstr((uint8_t *)(p + 27), "QEMU HARDDISK", 40); /* model */
+#if MAX_MULT_SECTORS > 1    
+    stw_raw(p + 47, MAX_MULT_SECTORS);
+#endif
+    stw_raw(p + 48, 1); /* dword I/O */
+    stw_raw(p + 49, 1 << 9); /* LBA supported, no DMA */
+    stw_raw(p + 51, 0x200); /* PIO transfer cycle */
+    stw_raw(p + 52, 0x200); /* DMA transfer cycle */
+    stw_raw(p + 54, s->cylinders);
+    stw_raw(p + 55, s->heads);
+    stw_raw(p + 56, s->sectors);
+    oldsize = s->cylinders * s->heads * s->sectors;
+    stw_raw(p + 57, oldsize);
+    stw_raw(p + 58, oldsize >> 16);
+    if (s->mult_sectors)
+        stw_raw(p + 59, 0x100 | s->mult_sectors);
+    stw_raw(p + 60, s->nb_sectors);
+    stw_raw(p + 61, s->nb_sectors >> 16);
+    stw_raw(p + 80, (1 << 1) | (1 << 2));
+    stw_raw(p + 82, (1 << 14));
+    stw_raw(p + 83, (1 << 14));
+    stw_raw(p + 84, (1 << 14));
+    stw_raw(p + 85, (1 << 14));
+    stw_raw(p + 86, 0);
+    stw_raw(p + 87, (1 << 14));
+}
+
+static void ide_atapi_identify(IDEState *s)
+{
+    uint16_t *p;
+
+    memset(s->io_buffer, 0, 512);
+    p = (uint16_t *)s->io_buffer;
+    /* Removable CDROM, 50us response, 12 byte packets */
+    stw_raw(p + 0, (2 << 14) | (5 << 8) | (1 << 7) | (2 << 5) | (0 << 0));
+    stw_raw(p + 1, s->cylinders); 
+    stw_raw(p + 3, s->heads);
+    stw_raw(p + 4, 512 * s->sectors); /* sectors */
+    stw_raw(p + 5, 512); /* sector size */
+    stw_raw(p + 6, s->sectors); 
+    padstr((uint8_t *)(p + 10), "QM00001", 20); /* serial number */
+    stw_raw(p + 20, 3); /* buffer type */
+    stw_raw(p + 21, 512); /* cache size in sectors */
+    stw_raw(p + 22, 4); /* ecc bytes */
+    padstr((uint8_t *)(p + 23), QEMU_VERSION, 8); /* firmware version */
+    padstr((uint8_t *)(p + 27), "QEMU CD-ROM", 40); /* model */
+    stw_raw(p + 48, 1); /* dword I/O (XXX: should not be set on CDROM) */
+    stw_raw(p + 49, 1 << 9); /* LBA supported, no DMA */
+    stw_raw(p + 53, 3); /* words 64-70, 54-58 valid */
+    stw_raw(p + 63, 0x103); /* DMA modes XXX: may be incorrect */
+    stw_raw(p + 64, 1); /* PIO modes */
+    stw_raw(p + 65, 0xb4); /* minimum DMA multiword tx cycle time */
+    stw_raw(p + 66, 0xb4); /* recommended DMA multiword tx cycle time */
+    stw_raw(p + 67, 0x12c); /* minimum PIO cycle time without flow control */
+    stw_raw(p + 68, 0xb4); /* minimum PIO cycle time with IORDY flow control */
+    
+    stw_raw(p + 71, 30); /* in ns */
+    stw_raw(p + 72, 30); /* in ns */
+
+    stw_raw(p + 80, 0x1e); /* support up to ATA/ATAPI-4 */
+}
+
+static void ide_set_signature(IDEState *s)
+{
+    s->select &= 0xf0; /* clear head */
+    /* put signature */
+    s->nsector = 1;
+    s->sector = 1;
+    if (s->is_cdrom) {
+        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_set_irq(IDEState *s)
+{
+    if (!(s->cmd & IDE_CMD_DISABLE_IRQ)) {
+        pic_set_irq(s->irq, 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;
+    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;
+}
+
+static int64_t ide_get_sector(IDEState *s)
+{
+    int64_t sector_num;
+    if (s->select & 0x40) {
+        /* lba */
+        sector_num = ((s->select & 0x0f) << 24) | (s->hcyl << 16) | 
+            (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;
+}
+
+static void ide_set_sector(IDEState *s, int64_t sector_num)
+{
+    unsigned int cyl, r;
+    if (s->select & 0x40) {
+        s->select = (s->select & 0xf0) | (sector_num >> 24);
+        s->hcyl = (sector_num >> 16);
+        s->lcyl = (sector_num >> 8);
+        s->sector = (sector_num);
+    } 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);
+        s->sector = (r % s->sectors) + 1;
+    }
+}
+
+static void ide_sector_read(IDEState *s)
+{
+    int64_t sector_num;
+    int ret, n;
+
+    s->status = READY_STAT | SEEK_STAT;
+    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=%Ld\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);
+        ide_transfer_start(s, s->io_buffer, 512 * n, ide_sector_read);
+        ide_set_irq(s);
+        ide_set_sector(s, sector_num + n);
+        s->nsector -= n;
+    }
+}
+
+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=%Ld\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);
+    s->nsector -= n;
+    if (s->nsector == 0) {
+        /* no more sector 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);
+    ide_set_irq(s);
+}
+
+static void ide_atapi_cmd_ok(IDEState *s)
+{
+    s->error = 0;
+    s->status = READY_STAT;
+    s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
+    ide_set_irq(s);
+}
+
+static 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);
+}
+
+static inline void cpu_to_ube16(uint8_t *buf, int val)
+{
+    buf[0] = val >> 8;
+    buf[1] = val;
+}
+
+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;
+}
+
+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];
+}
+
+/* The whole ATAPI transfer logic is handled in this function */
+static void ide_atapi_cmd_reply_end(IDEState *s)
+{
+    int byte_count_limit, size;
+#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;
+        s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
+        ide_set_irq(s);
+#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 >= 2048) {
+            bdrv_read(s->bs, (int64_t)s->lba << 2, s->io_buffer, 4);
+            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 = 2048 - 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;
+            } else {
+                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 > (2048 - s->io_buffer_index))
+                    size = (2048 - 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);
+#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->elementary_transfer_size = 0;
+    s->io_buffer_index = 0;
+
+    s->status = READY_STAT;
+    ide_atapi_cmd_reply_end(s);
+}
+
+/* start a CD-CDROM read command */
+static void ide_atapi_cmd_read(IDEState *s, int lba, int nb_sectors)
+{
+#ifdef DEBUG_IDE_ATAPI
+    printf("read: LBA=%d nb_sectors=%d\n", lba, nb_sectors);
+#endif
+    s->lba = lba;
+    s->packet_transfer_size = nb_sectors * 2048;
+    s->elementary_transfer_size = 0;
+    s->io_buffer_index = 2048;
+
+    s->status = READY_STAT;
+    ide_atapi_cmd_reply_end(s);
+}
+
+/* same toc as bochs. Return -1 if error or the toc length */
+static int cdrom_read_toc(IDEState *s, uint8_t *buf, int msf, int start_track)
+{
+    uint8_t *q;
+    int nb_sectors, len;
+    
+    if (start_track > 1 && start_track != 0xaa)
+        return -1;
+    q = buf + 2;
+    *q++ = 1;
+    *q++ = 1;
+    if (start_track <= 1) {
+        *q++ = 0; /* reserved */
+        *q++ = 0x14; /* ADR, control */
+        *q++ = 1;    /* track number */
+        *q++ = 0; /* reserved */
+        if (msf) {
+            *q++ = 0; /* reserved */
+            *q++ = 0; /* minute */
+            *q++ = 2; /* second */
+            *q++ = 0; /* frame */
+        } else {
+            /* sector 0 */
+            cpu_to_ube32(q, 0);
+            q += 4;
+        }
+    }
+    /* lead out track */
+    *q++ = 0; /* reserved */
+    *q++ = 0x16; /* ADR, control */
+    *q++ = 0xaa; /* track number */
+    *q++ = 0; /* reserved */
+    nb_sectors = s->nb_sectors >> 2;
+    if (msf) {
+        *q++ = 0; /* reserved */
+        *q++ = ((nb_sectors + 150) / 75) / 60;
+        *q++ = ((nb_sectors + 150) / 75) % 60;
+        *q++ = (nb_sectors + 150) % 75;
+    } else {
+        cpu_to_ube32(q, nb_sectors);
+        q += 4;
+    }
+    len = q - buf;
+    cpu_to_ube16(buf, len - 2);
+    return len;
+}
+
+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
+    switch(s->io_buffer[0]) {
+    case GPCMD_TEST_UNIT_READY:
+        if (s->bs) {
+            ide_atapi_cmd_ok(s);
+        } else {
+            ide_atapi_cmd_error(s, SENSE_NOT_READY, 
+                                ASC_MEDIUM_NOT_PRESENT);
+        }
+        break;
+    case GPCMD_MODE_SENSE_10:
+        {
+            int action, code;
+            max_len = ube16_to_cpu(packet + 7);
+            action = packet[2] >> 6;
+            code = packet[2] & 0x3f;
+            switch(action) {
+            case 0: /* current values */
+                switch(code) {
+                case 0x01: /* 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 0x2a:
+                    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;
+                    
+                    buf[12] = 0x70;
+                    buf[13] = 3 << 5;
+                    buf[14] = (1 << 0) | (1 << 3) | (1 << 5);
+                    if (s->cdrom_locked)
+                        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;
+        ide_atapi_cmd_reply(s, 18, max_len);
+        break;
+    case GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
+        if (s->bs) {
+            s->cdrom_locked = 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 (!s->bs) {
+                ide_atapi_cmd_error(s, SENSE_NOT_READY, 
+                                    ASC_MEDIUM_NOT_PRESENT);
+                break;
+            }
+            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;
+            }
+            if (((int64_t)(lba + nb_sectors) << 2) > s->nb_sectors) {
+                ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST, 
+                                    ASC_LOGICAL_BLOCK_OOR);
+                break;
+            }
+            ide_atapi_cmd_read(s, lba, nb_sectors);
+        }
+        break;
+    case GPCMD_SEEK:
+        {
+            int lba;
+            if (!s->bs) {
+                ide_atapi_cmd_error(s, SENSE_NOT_READY, 
+                                    ASC_MEDIUM_NOT_PRESENT);
+                break;
+            }
+            lba = ube32_to_cpu(packet + 2);
+            if (((int64_t)lba << 2) > s->nb_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;
+            start = packet[4] & 1;
+            eject = (packet[4] >> 1) & 1;
+            
+            /* XXX: currently none implemented */
+            ide_atapi_cmd_ok(s);
+        }
+        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;
+
+            if (!s->bs) {
+                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(s, 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;
+            default:
+                goto error_cmd;
+            }
+        }
+        break;
+    case GPCMD_READ_CDVD_CAPACITY:
+        if (!s->bs) {
+            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, (s->nb_sectors >> 2) - 1);
+        cpu_to_ube32(buf + 4, 2048);
+        ide_atapi_cmd_reply(s, 8, 8);
+        break;
+    default:
+        error_cmd:
+        ide_atapi_cmd_error(s, SENSE_ILLEGAL_REQUEST, 
+                            ASC_INV_FIELD_IN_CMD_PACKET);
+        break;
+    }
+}
+
+static void ide_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
+{
+    IDEState *ide_if = get_ide_interface(addr);
+    IDEState *s = ide_if->cur_drive;
+    int unit, n;
+
+#ifdef DEBUG_IDE
+    printf("IDE: write addr=0x%x val=0x%02x\n", addr, val);
+#endif
+    addr &= 7;
+    switch(addr) {
+    case 0:
+        break;
+    case 1:
+        s->feature = val;
+        break;
+    case 2:
+        if (val == 0)
+            val = 256;
+        s->nsector = val;
+        break;
+    case 3:
+        s->sector = val;
+        break;
+    case 4:
+        s->lcyl = val;
+        break;
+    case 5:
+        s->hcyl = val;
+        break;
+    case 6:
+        /* select drive */
+        unit = (val >> 4) & 1;
+        s = ide_if + unit;
+        ide_if->cur_drive = s;
+        s->select = val;
+        break;
+    default:
+    case 7:
+        /* command */
+#if defined(DEBUG_IDE)
+        printf("ide: CMD=%02x\n", val);
+#endif
+        switch(val) {
+        case WIN_IDENTIFY:
+            if (s->bs && !s->is_cdrom) {
+                ide_identify(s);
+                s->status = READY_STAT;
+                ide_transfer_start(s, s->io_buffer, 512, ide_transfer_stop);
+            } else {
+                if (s->is_cdrom) {
+                    ide_set_signature(s);
+                }
+                ide_abort_command(s);
+            }
+            ide_set_irq(s);
+            break;
+        case WIN_SPECIFY:
+        case WIN_RECAL:
+            s->status = READY_STAT;
+            ide_set_irq(s);
+            break;
+        case WIN_SETMULT:
+            if (s->nsector > MAX_MULT_SECTORS || 
+                s->nsector == 0 ||
+                (s->nsector & (s->nsector - 1)) != 0) {
+                ide_abort_command(s);
+            } else {
+                s->mult_sectors = s->nsector;
+                s->status = READY_STAT;
+            }
+            ide_set_irq(s);
+            break;
+        case WIN_READ:
+        case WIN_READ_ONCE:
+            s->req_nb_sectors = 1;
+            ide_sector_read(s);
+            break;
+        case WIN_WRITE:
+        case WIN_WRITE_ONCE:
+            s->status = SEEK_STAT;
+            s->req_nb_sectors = 1;
+            ide_transfer_start(s, s->io_buffer, 512, ide_sector_write);
+            break;
+        case WIN_MULTREAD:
+            if (!s->mult_sectors)
+                goto abort_cmd;
+            s->req_nb_sectors = s->mult_sectors;
+            ide_sector_read(s);
+            break;
+        case WIN_MULTWRITE:
+            if (!s->mult_sectors)
+                goto abort_cmd;
+            s->status = SEEK_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);
+            break;
+        case WIN_READ_NATIVE_MAX:
+            ide_set_sector(s, s->nb_sectors - 1);
+            s->status = READY_STAT;
+            ide_set_irq(s);
+            break;
+
+            /* ATAPI commands */
+        case WIN_PIDENTIFY:
+            if (s->is_cdrom) {
+                ide_atapi_identify(s);
+                s->status = READY_STAT;
+                ide_transfer_start(s, s->io_buffer, 512, ide_transfer_stop);
+            } else {
+                ide_abort_command(s);
+            }
+            ide_set_irq(s);
+            break;
+        case WIN_SRST:
+            if (!s->is_cdrom)
+                goto abort_cmd;
+            ide_set_signature(s);
+            s->status = READY_STAT;
+            s->error = 0x01;
+            break;
+        case WIN_PACKETCMD:
+            if (!s->is_cdrom)
+                goto abort_cmd;
+            /* DMA or overlapping commands not supported */
+            if ((s->feature & 0x03) != 0)
+                goto abort_cmd;
+            s->nsector = 1;
+            ide_transfer_start(s, s->io_buffer, ATAPI_PACKET_SIZE, 
+                               ide_atapi_cmd);
+            break;
+        default:
+        abort_cmd:
+            ide_abort_command(s);
+            ide_set_irq(s);
+            break;
+        }
+    }
+}
+
+static uint32_t ide_ioport_read(CPUX86State *env, uint32_t addr1)
+{
+    IDEState *s = get_ide_interface(addr1)->cur_drive;
+    uint32_t addr;
+    int ret;
+
+    addr = addr1 & 7;
+    switch(addr) {
+    case 0:
+        ret = 0xff;
+        break;
+    case 1:
+        ret = s->error;
+        break;
+    case 2:
+        ret = s->nsector & 0xff;
+        break;
+    case 3:
+        ret = s->sector;
+        break;
+    case 4:
+        ret = s->lcyl;
+        break;
+    case 5:
+        ret = s->hcyl;
+        break;
+    case 6:
+        ret = s->select;
+        break;
+    default:
+    case 7:
+        ret = s->status;
+        pic_set_irq(s->irq, 0);
+        break;
+    }
+#ifdef DEBUG_IDE
+    printf("ide: read addr=0x%x val=%02x\n", addr1, ret);
+#endif
+    return ret;
+}
+
+static uint32_t ide_status_read(CPUX86State *env, uint32_t addr)
+{
+    IDEState *s = get_ide_interface(addr)->cur_drive;
+    int ret;
+    ret = s->status;
+#ifdef DEBUG_IDE
+    printf("ide: read status addr=0x%x val=%02x\n", addr, ret);
+#endif
+    return ret;
+}
+
+static void ide_cmd_write(CPUX86State *env, uint32_t addr, uint32_t val)
+{
+    IDEState *ide_if = get_ide_interface(addr);
+    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 (!(ide_if[0].cmd & IDE_CMD_RESET) &&
+        (val & IDE_CMD_RESET)) {
+        /* reset low to high */
+        for(i = 0;i < 2; i++) {
+            s = &ide_if[i];
+            s->status = BUSY_STAT | SEEK_STAT;
+            s->error = 0x01;
+        }
+    } else if ((ide_if[0].cmd & IDE_CMD_RESET) &&
+               !(val & IDE_CMD_RESET)) {
+        /* high to low */
+        for(i = 0;i < 2; i++) {
+            s = &ide_if[i];
+            s->status = READY_STAT;
+            ide_set_signature(s);
+        }
+    }
+
+    ide_if[0].cmd = val;
+    ide_if[1].cmd = val;
+}
+
+static void ide_data_writew(CPUX86State *env, uint32_t addr, uint32_t val)
+{
+    IDEState *s = get_ide_interface(addr)->cur_drive;
+    uint8_t *p;
+
+    p = s->data_ptr;
+    *(uint16_t *)p = tswap16(val);
+    p += 2;
+    s->data_ptr = p;
+    if (p >= s->data_end)
+        s->end_transfer_func(s);
+}
+
+static uint32_t ide_data_readw(CPUX86State *env, uint32_t addr)
+{
+    IDEState *s = get_ide_interface(addr)->cur_drive;
+    uint8_t *p;
+    int ret;
+    p = s->data_ptr;
+    ret = tswap16(*(uint16_t *)p);
+    p += 2;
+    s->data_ptr = p;
+    if (p >= s->data_end)
+        s->end_transfer_func(s);
+    return ret;
+}
+
+static void ide_data_writel(CPUX86State *env, uint32_t addr, uint32_t val)
+{
+    IDEState *s = get_ide_interface(addr)->cur_drive;
+    uint8_t *p;
+
+    p = s->data_ptr;
+    *(uint32_t *)p = tswap32(val);
+    p += 4;
+    s->data_ptr = p;
+    if (p >= s->data_end)
+        s->end_transfer_func(s);
+}
+
+static uint32_t ide_data_readl(CPUX86State *env, uint32_t addr)
+{
+    IDEState *s = get_ide_interface(addr)->cur_drive;
+    uint8_t *p;
+    int ret;
+    
+    p = s->data_ptr;
+    ret = tswap32(*(uint32_t *)p);
+    p += 4;
+    s->data_ptr = p;
+    if (p >= s->data_end)
+        s->end_transfer_func(s);
+    return ret;
+}
+
+static void ide_reset(IDEState *s)
+{
+    s->mult_sectors = MAX_MULT_SECTORS;
+    s->cur_drive = s;
+    s->select = 0xa0;
+    s->status = READY_STAT;
+    ide_set_signature(s);
+}
+
+struct partition {
+	uint8_t boot_ind;		/* 0x80 - active */
+	uint8_t head;		/* starting head */
+	uint8_t sector;		/* starting sector */
+	uint8_t cyl;		/* starting cylinder */
+	uint8_t sys_ind;		/* What partition type */
+	uint8_t end_head;		/* end head */
+	uint8_t end_sector;	/* end sector */
+	uint8_t end_cyl;		/* end cylinder */
+	uint32_t start_sect;	/* starting sector counting from 0 */
+	uint32_t nr_sects;		/* nr of sectors in partition */
+} __attribute__((packed));
+
+/* try to guess the IDE geometry from the MSDOS partition table */
+static void ide_guess_geometry(IDEState *s)
+{
+    uint8_t buf[512];
+    int ret, i;
+    struct partition *p;
+    uint32_t nr_sects;
+
+    if (s->cylinders != 0)
+        return;
+    ret = bdrv_read(s->bs, 0, buf, 1);
+    if (ret < 0)
+        return;
+    /* test msdos magic */
+    if (buf[510] != 0x55 || buf[511] != 0xaa)
+        return;
+    for(i = 0; i < 4; i++) {
+        p = ((struct partition *)(buf + 0x1be)) + i;
+        nr_sects = tswap32(p->nr_sects);
+        if (nr_sects && p->end_head) {
+            /* We make the assumption that the partition terminates on
+               a cylinder boundary */
+            s->heads = p->end_head + 1;
+            s->sectors = p->end_sector & 63;
+            s->cylinders = s->nb_sectors / (s->heads * s->sectors);
+#if 0
+            printf("guessed partition: CHS=%d %d %d\n", 
+                   s->cylinders, s->heads, s->sectors);
+#endif
+        }
+    }
+}
+
+void ide_init(void)
+{
+    IDEState *s;
+    int i, cylinders, iobase, iobase2;
+    int64_t nb_sectors;
+    static const int ide_iobase[2] = { 0x1f0, 0x170 };
+    static const int ide_iobase2[2] = { 0x3f6, 0x376 };
+    static const int ide_irq[2] = { 14, 15 };
+
+    for(i = 0; i < MAX_DISKS; i++) {
+        s = &ide_state[i];
+        s->bs = bs_table[i];
+        if (s->bs) {
+            bdrv_get_geometry(s->bs, &nb_sectors);
+            s->nb_sectors = nb_sectors;
+            ide_guess_geometry(s);
+            if (s->cylinders == 0) {
+                /* if no geometry, use a LBA compatible one */
+                cylinders = nb_sectors / (16 * 63);
+                if (cylinders > 16383)
+                    cylinders = 16383;
+                else if (cylinders < 2)
+                    cylinders = 2;
+                s->cylinders = cylinders;
+                s->heads = 16;
+                s->sectors = 63;
+            }
+        }
+        s->irq = ide_irq[i >> 1];
+        ide_reset(s);
+    }
+    for(i = 0; i < (MAX_DISKS / 2); i++) {
+        iobase = ide_iobase[i];
+        iobase2 = ide_iobase2[i];
+        ide_table[iobase >> 3] = &ide_state[2 * i];
+        if (ide_iobase2[i]) 
+            ide_table[iobase2 >> 3] = &ide_state[2 * i];
+        register_ioport_write(iobase, 8, ide_ioport_write, 1);
+        register_ioport_read(iobase, 8, ide_ioport_read, 1);
+        register_ioport_read(iobase2, 1, ide_status_read, 1);
+        register_ioport_write(iobase2, 1, ide_cmd_write, 1);
+        
+        /* data ports */
+        register_ioport_write(iobase, 2, ide_data_writew, 2);
+        register_ioport_read(iobase, 2, ide_data_readw, 2);
+        register_ioport_write(iobase, 4, ide_data_writel, 4);
+        register_ioport_read(iobase, 4, ide_data_readl, 4);
+    }
+}
+
+void ide_set_geometry(int n, int cyls, int heads, int secs)
+{
+    ide_state[n].cylinders = cyls;
+    ide_state[n].heads = heads;
+    ide_state[n].sectors = secs;
+}
+
+void ide_set_cdrom(int n, int is_cdrom)
+{
+    ide_state[n].is_cdrom = is_cdrom;
+}