Add working webpage for unix v4

1 files changed, 835 insertions, 0 deletions

diff --git a/jslinux-2019-12-21/tinyemu-2019-12-21/ide.c b/jslinux-2019-12-21/tinyemu-2019-12-21/ide.c
new file mode 100644
index 0000000..4952965
--- /dev/null
+++ b/jslinux-2019-12-21/tinyemu-2019-12-21/ide.c
@@ -0,0 +1,835 @@
+/*
+ * IDE emulation
+ * 
+ * Copyright (c) 2003-2016 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 <string.h>
+#include <inttypes.h>
+#include <assert.h>
+
+#include "cutils.h"
+#include "ide.h"
+
+//#define DEBUG_IDE
+
+/* 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
+
+#define MAX_MULT_SECTORS 128
+
+typedef struct IDEState IDEState;
+
+typedef void EndTransferFunc(IDEState *);
+
+struct IDEState {
+    IDEIFState *ide_if;
+    BlockDevice *bs;
+    int cylinders, heads, sectors;
+    int mult_sectors;
+    int64_t nb_sectors;
+
+    /* 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;
+
+    int io_nb_sectors;
+    int req_nb_sectors;
+    EndTransferFunc *end_transfer_func;
+    
+    int data_index;
+    int data_end;
+    uint8_t io_buffer[MAX_MULT_SECTORS*512 + 4];
+};
+
+struct IDEIFState {
+    IRQSignal *irq;
+    IDEState *cur_drive;
+    IDEState *drives[2];
+    /* 0x3f6 command */
+    uint8_t cmd;
+};
+
+static void ide_sector_read_cb(void *opaque, int ret);
+static void ide_sector_read_cb_end(IDEState *s);
+static void ide_sector_write_cb2(void *opaque, int ret);
+
+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++;
+    }
+}
+
+/* little endian assume */
+static void stw(uint16_t *buf, int v)
+{
+    *buf = v;
+}
+
+static void ide_identify(IDEState *s)
+{
+    uint16_t *tab;
+    uint32_t oldsize;
+    
+    tab = (uint16_t *)s->io_buffer;
+
+    memset(tab, 0, 512 * 2);
+
+    stw(tab + 0, 0x0040);
+    stw(tab + 1, s->cylinders); 
+    stw(tab + 3, s->heads);
+    stw(tab + 4, 512 * s->sectors); /* sectors */
+    stw(tab + 5, 512); /* sector size */
+    stw(tab + 6, s->sectors); 
+    stw(tab + 20, 3); /* buffer type */
+    stw(tab + 21, 512); /* cache size in sectors */
+    stw(tab + 22, 4); /* ecc bytes */
+    padstr((char *)(tab + 27), "RISCVEMU HARDDISK", 40);
+    stw(tab + 47, 0x8000 | MAX_MULT_SECTORS);
+    stw(tab + 48, 0); /* dword I/O */
+    stw(tab + 49, 1 << 9); /* LBA supported, no DMA */
+    stw(tab + 51, 0x200); /* PIO transfer cycle */
+    stw(tab + 52, 0x200); /* DMA transfer cycle */
+    stw(tab + 54, s->cylinders);
+    stw(tab + 55, s->heads);
+    stw(tab + 56, s->sectors);
+    oldsize = s->cylinders * s->heads * s->sectors;
+    stw(tab + 57, oldsize);
+    stw(tab + 58, oldsize >> 16);
+    if (s->mult_sectors)
+        stw(tab + 59, 0x100 | s->mult_sectors);
+    stw(tab + 60, s->nb_sectors);
+    stw(tab + 61, s->nb_sectors >> 16);
+    stw(tab + 80, (1 << 1) | (1 << 2));
+    stw(tab + 82, (1 << 14));
+    stw(tab + 83, (1 << 14));
+    stw(tab + 84, (1 << 14));
+    stw(tab + 85, (1 << 14));
+    stw(tab + 86, 0);
+    stw(tab + 87, (1 << 14));
+}
+
+static void ide_set_signature(IDEState *s) 
+{
+    s->select &= 0xf0;
+    s->nsector = 1;
+    s->sector = 1;
+    s->lcyl = 0;
+    s->hcyl = 0;
+}
+
+static void ide_abort_command(IDEState *s) 
+{
+    s->status = READY_STAT | ERR_STAT;
+    s->error = ABRT_ERR;
+}
+
+static void ide_set_irq(IDEState *s) 
+{
+    IDEIFState *ide_if = s->ide_if;
+    if (!(ide_if->cmd & IDE_CMD_DISABLE_IRQ)) {
+        set_irq(ide_if->irq, 1);
+    }
+}
+
+/* prepare data transfer and tell what to do after */
+static void ide_transfer_start(IDEState *s, int size,
+                               EndTransferFunc *end_transfer_func)
+{
+    s->end_transfer_func = end_transfer_func;
+    s->data_index = 0;
+    s->data_end = size;
+}
+
+static void ide_transfer_stop(IDEState *s)
+{
+    s->end_transfer_func = ide_transfer_stop;
+    s->data_index = 0;
+    s->data_end = 0;
+}
+
+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) & 0x0f);
+        s->hcyl = (sector_num >> 16) & 0xff;
+        s->lcyl = (sector_num >> 8) & 0xff;
+        s->sector = sector_num & 0xff;
+    } else {
+        cyl = sector_num / (s->heads * s->sectors);
+        r = sector_num % (s->heads * s->sectors);
+        s->hcyl = (cyl >> 8) & 0xff;
+        s->lcyl = cyl & 0xff;
+        s->select = (s->select & 0xf0) | ((r / s->sectors) & 0x0f);
+        s->sector = (r % s->sectors) + 1;
+    }
+}
+
+static void ide_sector_read(IDEState *s)
+{
+    int64_t sector_num;
+    int ret, n;
+
+    sector_num = ide_get_sector(s);
+    n = s->nsector;
+    if (n == 0) 
+        n = 256;
+    if (n > s->req_nb_sectors)
+        n = s->req_nb_sectors;
+#if defined(DEBUG_IDE)
+    printf("read sector=%" PRId64 " count=%d\n", sector_num, n);
+#endif
+    s->io_nb_sectors = n;
+    ret = s->bs->read_async(s->bs, sector_num, s->io_buffer, n, 
+                            ide_sector_read_cb, s);
+    if (ret < 0) {
+        /* error */
+        ide_abort_command(s);
+        ide_set_irq(s);
+    } else if (ret == 0) {
+        /* synchronous case (needed for performance) */
+        ide_sector_read_cb(s, 0);
+    } else {
+        /* async case */
+        s->status = READY_STAT | SEEK_STAT | BUSY_STAT;
+        s->error = 0; /* not needed by IDE spec, but needed by Windows */
+    }
+}
+
+static void ide_sector_read_cb(void *opaque, int ret)
+{
+    IDEState *s = opaque;
+    int n;
+    EndTransferFunc *func;
+    
+    n = s->io_nb_sectors;
+    ide_set_sector(s, ide_get_sector(s) + n);
+    s->nsector = (s->nsector - n) & 0xff;
+    if (s->nsector == 0)
+        func = ide_sector_read_cb_end;
+    else
+        func = ide_sector_read;
+    ide_transfer_start(s, 512 * n, func);
+    ide_set_irq(s);
+    s->status = READY_STAT | SEEK_STAT | DRQ_STAT;
+    s->error = 0; /* not needed by IDE spec, but needed by Windows */
+}
+
+static void ide_sector_read_cb_end(IDEState *s)
+{
+    /* no more sector to read from disk */
+    s->status = READY_STAT | SEEK_STAT;
+    s->error = 0; /* not needed by IDE spec, but needed by Windows */
+    ide_transfer_stop(s);
+}
+
+static void ide_sector_write_cb1(IDEState *s)
+{
+    int64_t sector_num;
+    int ret;
+
+    ide_transfer_stop(s);
+    sector_num = ide_get_sector(s);
+#if defined(DEBUG_IDE)
+    printf("write sector=%" PRId64 "  count=%d\n",
+           sector_num, s->io_nb_sectors);
+#endif
+    ret = s->bs->write_async(s->bs, sector_num, s->io_buffer, s->io_nb_sectors, 
+                             ide_sector_write_cb2, s);
+    if (ret < 0) {
+        /* error */
+        ide_abort_command(s);
+        ide_set_irq(s);
+    } else if (ret == 0) {
+        /* synchronous case (needed for performance) */
+        ide_sector_write_cb2(s, 0);
+    } else {
+        /* async case */
+        s->status = READY_STAT | SEEK_STAT | BUSY_STAT;
+    }
+}
+
+static void ide_sector_write_cb2(void *opaque, int ret)
+{
+    IDEState *s = opaque;
+    int n;
+
+    n = s->io_nb_sectors;
+    ide_set_sector(s, ide_get_sector(s) + n);
+    s->nsector = (s->nsector - n) & 0xff;
+    if (s->nsector == 0) {
+        /* no more sectors to write */
+        s->status = READY_STAT | SEEK_STAT;
+    } else {
+        n = s->nsector;
+        if (n > s->req_nb_sectors)
+            n = s->req_nb_sectors;
+        s->io_nb_sectors = n;
+        ide_transfer_start(s, 512 * n, ide_sector_write_cb1);
+        s->status = READY_STAT | SEEK_STAT | DRQ_STAT;
+    }
+    ide_set_irq(s);
+}
+
+static void ide_sector_write(IDEState *s)
+{
+    int n;
+    n = s->nsector;
+    if (n == 0)
+        n = 256;
+    if (n > s->req_nb_sectors)
+        n = s->req_nb_sectors;
+    s->io_nb_sectors = n;
+    ide_transfer_start(s, 512 * n, ide_sector_write_cb1);
+    s->status = READY_STAT | SEEK_STAT | DRQ_STAT;
+}
+
+static void ide_identify_cb(IDEState *s)
+{
+    ide_transfer_stop(s);
+    s->status = READY_STAT;
+}
+
+static void ide_exec_cmd(IDEState *s, int val)
+{
+#if defined(DEBUG_IDE)
+    printf("ide: exec_cmd=0x%02x\n", val);
+#endif
+    switch(val) {
+    case WIN_IDENTIFY:
+        ide_identify(s);
+        s->status = READY_STAT | SEEK_STAT | DRQ_STAT;
+        ide_transfer_start(s, 512, ide_identify_cb);
+        ide_set_irq(s);
+        break;
+    case WIN_SPECIFY:
+    case WIN_RECAL:
+        s->error = 0;
+        s->status = READY_STAT | SEEK_STAT;
+        ide_set_irq(s);
+        break;
+    case WIN_SETMULT:
+        if (s->nsector > MAX_MULT_SECTORS || 
+            (s->nsector & (s->nsector - 1)) != 0) {
+            ide_abort_command(s);
+        } else {
+            s->mult_sectors = s->nsector;
+#if defined(DEBUG_IDE)
+            printf("ide: setmult=%d\n", s->mult_sectors);
+#endif
+            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->req_nb_sectors = 1;
+        ide_sector_write(s);
+        break;
+    case WIN_MULTREAD:
+        if (!s->mult_sectors) {
+            ide_abort_command(s);
+            ide_set_irq(s);
+        } else {
+            s->req_nb_sectors = s->mult_sectors;
+            ide_sector_read(s);
+        }
+        break;
+    case WIN_MULTWRITE:
+        if (!s->mult_sectors) {
+            ide_abort_command(s);
+            ide_set_irq(s);
+        } else {
+            s->req_nb_sectors = s->mult_sectors;
+            ide_sector_write(s);
+        }
+        break;
+    case WIN_READ_NATIVE_MAX:
+        ide_set_sector(s, s->nb_sectors - 1);
+        s->status = READY_STAT;
+        ide_set_irq(s);
+        break;
+    default:
+        ide_abort_command(s);
+        ide_set_irq(s);
+        break;
+    }
+}
+
+static void ide_ioport_write(void *opaque, uint32_t offset,
+                             uint32_t val, int size_log2)
+{
+    IDEIFState *s1 = opaque;
+    IDEState *s = s1->cur_drive;
+    int addr = offset + 1;
+    
+#ifdef DEBUG_IDE
+    printf("ide: write addr=0x%02x val=0x%02x\n", addr, val);
+#endif
+    switch(addr) {
+    case 0:
+        break;
+    case 1:
+        if (s) {
+            s->feature = val;
+        }
+        break;
+    case 2:
+        if (s) {
+            s->nsector = val;
+        }
+        break;
+    case 3:
+        if (s) {
+            s->sector = val;
+        }
+        break;
+    case 4:
+        if (s) {
+            s->lcyl = val;
+        }
+        break;
+    case 5:
+        if (s) {
+            s->hcyl = val;
+        }
+        break;
+    case 6:
+        /* select drive */
+        s = s1->cur_drive = s1->drives[(val >> 4) & 1];
+        if (s) {
+            s->select = val;
+        }
+        break;
+    default:
+    case 7:
+        /* command */
+        if (s) {
+            ide_exec_cmd(s, val);
+        }
+        break;
+    }
+}
+
+static uint32_t ide_ioport_read(void *opaque, uint32_t offset, int size_log2)
+{
+    IDEIFState *s1 = opaque;
+    IDEState *s = s1->cur_drive;
+    int ret, addr = offset + 1;
+
+    if (!s) {
+        ret = 0x00;
+    } else {
+        switch(addr) {
+        case 0:
+           ret = 0xff;
+           break;
+        case 1:
+            ret = s->error;
+            break;
+        case 2:
+            ret = s->nsector;
+            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;
+            set_irq(s1->irq, 0);
+            break;
+        }
+    }
+#ifdef DEBUG_IDE
+    printf("ide: read addr=0x%02x val=0x%02x\n", addr, ret);
+#endif
+    return ret;
+}
+
+static uint32_t ide_status_read(void *opaque, uint32_t offset, int size_log2)
+{
+    IDEIFState *s1 = opaque;
+    IDEState *s = s1->cur_drive;
+    int ret;
+
+    if (s) {
+        ret = s->status;
+    } else {
+        ret = 0;
+    }
+#ifdef DEBUG_IDE
+    printf("ide: read status=0x%02x\n", ret);
+#endif
+    return ret;
+}
+
+static void ide_cmd_write(void *opaque, uint32_t offset,
+                          uint32_t val, int size_log2)
+{
+    IDEIFState *s1 = opaque;
+    IDEState *s;
+    int i;
+    
+#ifdef DEBUG_IDE
+    printf("ide: cmd write=0x%02x\n", val);
+#endif
+    if (!(s1->cmd & IDE_CMD_RESET) && (val & IDE_CMD_RESET)) {
+        /* low to high */
+        for(i = 0; i < 2; i++) {
+            s = s1->drives[i];
+            if (s) {
+                s->status = BUSY_STAT | SEEK_STAT;
+                s->error = 0x01;
+            }
+        }
+    } else if ((s1->cmd & IDE_CMD_RESET) && !(val & IDE_CMD_RESET)) {
+        /* high to low */
+        for(i = 0; i < 2; i++) {
+            s = s1->drives[i];
+            if (s) {
+                s->status = READY_STAT | SEEK_STAT;
+                ide_set_signature(s);
+            }
+        }
+    }
+    s1->cmd = val;
+}
+
+static void ide_data_writew(void *opaque, uint32_t offset,
+                            uint32_t val, int size_log2)
+{
+    IDEIFState *s1 = opaque;
+    IDEState *s = s1->cur_drive;
+    int p;
+    uint8_t *tab;
+    
+    if (!s)
+        return;
+    p = s->data_index;
+    tab = s->io_buffer;
+    tab[p] = val & 0xff;
+    tab[p + 1] = (val >> 8) & 0xff;
+    p += 2;
+    s->data_index = p;
+    if (p >= s->data_end)
+        s->end_transfer_func(s);
+}
+
+static uint32_t ide_data_readw(void *opaque, uint32_t offset, int size_log2)
+{
+    IDEIFState *s1 = opaque;
+    IDEState *s = s1->cur_drive;
+    int p, ret;
+    uint8_t *tab;
+    
+    if (!s) {
+        ret = 0;
+    } else {
+        p = s->data_index;
+        tab = s->io_buffer;
+        ret = tab[p] | (tab[p + 1] << 8);
+        p += 2;
+        s->data_index = p;
+        if (p >= s->data_end)
+            s->end_transfer_func(s);
+    }
+    return ret;
+}
+
+static IDEState *ide_drive_init(IDEIFState *ide_if, BlockDevice *bs)
+{
+    IDEState *s;
+    uint32_t cylinders;
+    uint64_t nb_sectors;
+
+    s = malloc(sizeof(*s));
+    memset(s, 0, sizeof(*s));
+
+    s->ide_if = ide_if;
+    s->bs = bs;
+
+    nb_sectors = s->bs->get_sector_count(s->bs);
+    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->nb_sectors = nb_sectors;
+
+    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;
+    s->select = 0xa0;
+    s->status = READY_STAT | SEEK_STAT;
+
+    /* init I/O buffer */
+    s->data_index = 0;
+    s->data_end = 0;
+    s->end_transfer_func = ide_transfer_stop;
+
+    s->req_nb_sectors = 0; /* temp for read/write */
+    s->io_nb_sectors = 0; /* temp for read/write */
+    return s;
+}
+
+IDEIFState *ide_init(PhysMemoryMap *port_map, uint32_t addr, uint32_t addr2,
+                     IRQSignal *irq, BlockDevice **tab_bs)
+{
+    int i;
+    IDEIFState *s;
+    
+    s = malloc(sizeof(IDEIFState));
+    memset(s, 0, sizeof(*s));
+    
+    s->irq = irq;
+    s->cmd = 0;
+
+    cpu_register_device(port_map, addr, 1, s, ide_data_readw, ide_data_writew, 
+                        DEVIO_SIZE16);
+    cpu_register_device(port_map, addr + 1, 7, s, ide_ioport_read, ide_ioport_write, 
+                        DEVIO_SIZE8);
+    if (addr2) {
+        cpu_register_device(port_map, addr2, 1, s, ide_status_read, ide_cmd_write, 
+                            DEVIO_SIZE8);
+    }
+    
+    for(i = 0; i < 2; i++) {
+        if (tab_bs[i])
+            s->drives[i] = ide_drive_init(s, tab_bs[i]);
+    }
+    s->cur_drive = s->drives[0];
+    return s;
+}
+
+/* dummy PCI device for the IDE */
+PCIDevice *piix3_ide_init(PCIBus *pci_bus, int devfn)
+{
+    PCIDevice *d;
+    d = pci_register_device(pci_bus, "PIIX3 IDE", devfn, 0x8086, 0x7010, 0x00, 0x0101);
+    pci_device_set_config8(d, 0x09, 0x00); /* ISA IDE ports, no DMA */
+    return d;
+}