external/qemu 0.8.2

1 files changed, 478 insertions, 0 deletions

diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
new file mode 100644
index 0000000..decab1f
--- /dev/null
+++ b/hw/scsi-disk.c
@@ -0,0 +1,478 @@
+/*
+ * SCSI Device emulation
+ *
+ * Copyright (c) 2006 CodeSourcery.
+ * Based on code by Fabrice Bellard
+ *
+ * Written by Paul Brook
+ *
+ * This code is licenced under the LGPL.
+ */
+
+//#define DEBUG_SCSI
+
+#ifdef DEBUG_SCSI
+#define DPRINTF(fmt, args...) \
+do { printf("scsi-disk: " fmt , ##args); } while (0)
+#else
+#define DPRINTF(fmt, args...) do {} while(0)
+#endif
+
+#define BADF(fmt, args...) \
+do { fprintf(stderr, "scsi-disk: " fmt , ##args); } while (0)
+
+#include "vl.h"
+
+#define SENSE_NO_SENSE        0
+#define SENSE_ILLEGAL_REQUEST 5
+
+struct SCSIDevice
+{
+    int command;
+    uint32_t tag;
+    BlockDriverState *bdrv;
+    /* The qemu block layer uses a fixed 512 byte sector size.
+       This is the number of 512 byte blocks in a single scsi sector.  */
+    int cluster_size;
+    /* When transfering data buf_pos and buf_len contain a partially
+       transferred block of data (or response to a command), and
+       sector/sector_count identify any remaining sectors.
+       Both sector and sector_count are in terms of qemu 512 byte blocks.  */
+    /* ??? We should probably keep track of whether the data trasfer is
+       a read or a write.  Currently we rely on the host getting it right.  */
+    int sector;
+    int sector_count;
+    int buf_pos;
+    int buf_len;
+    int sense;
+    char buf[512];
+    scsi_completionfn completion;
+    void *opaque;
+};
+
+static void scsi_command_complete(SCSIDevice *s, int sense)
+{
+    s->sense = sense;
+    s->completion(s->opaque, s->tag, sense);
+}
+
+/* Read data from a scsi device.  Returns nonzero on failure.  */
+int scsi_read_data(SCSIDevice *s, uint8_t *data, uint32_t len)
+{
+    uint32_t n;
+
+    DPRINTF("Read %d (%d/%d)\n", len, s->buf_len, s->sector_count);
+    if (s->buf_len == 0 && s->sector_count == 0)
+        return 1;
+
+    if (s->buf_len) {
+        n = s->buf_len;
+        if (n > len)
+            n = len;
+        memcpy(data, s->buf + s->buf_pos, n);
+        s->buf_pos += n;
+        s->buf_len -= n;
+        data += n;
+        len -= n;
+        if (s->buf_len == 0)
+            s->buf_pos = 0;
+    }
+
+    n = len / 512;
+    if (n > s->sector_count)
+      n = s->sector_count;
+
+    if (n != 0) {
+        bdrv_read(s->bdrv, s->sector, data, n);
+        data += n * 512;
+        len -= n * 512;
+        s->sector += n;
+        s->sector_count -= n;
+    }
+
+    if (len && s->sector_count) {
+        bdrv_read(s->bdrv, s->sector, s->buf, 1);
+        s->sector++;
+        s->sector_count--;
+        s->buf_pos = 0;
+        s->buf_len = 512;
+        /* Recurse to complete the partial read.  */
+        return scsi_read_data(s, data, len);
+    }
+
+    if (len != 0)
+        return 1;
+
+    if (s->buf_len == 0 && s->sector_count == 0)
+        scsi_command_complete(s, SENSE_NO_SENSE);
+
+    return 0;
+}
+
+/* Read data to a scsi device.  Returns nonzero on failure.  */
+int scsi_write_data(SCSIDevice *s, uint8_t *data, uint32_t len)
+{
+    uint32_t n;
+
+    DPRINTF("Write %d (%d/%d)\n", len, s->buf_len, s->sector_count);
+    if (s->buf_pos != 0) {
+        BADF("Bad state on write\n");
+        return 1;
+    }
+
+    if (s->sector_count == 0)
+        return 1;
+
+    if (s->buf_len != 0 || len < 512) {
+        n = 512 - s->buf_len;
+        if (n > len)
+            n = len;
+
+        memcpy(s->buf + s->buf_len, data, n);
+        data += n;
+        s->buf_len += n;
+        len -= n;
+        if (s->buf_len == 512) {
+            /* A full sector has been accumulated. Write it to disk.  */
+            bdrv_write(s->bdrv, s->sector, s->buf, 1);
+            s->buf_len = 0;
+            s->sector++;
+            s->sector_count--;
+        }
+    }
+
+    n = len / 512;
+    if (n > s->sector_count)
+        n = s->sector_count;
+
+    if (n != 0) {
+        bdrv_write(s->bdrv, s->sector, data, n);
+        data += n * 512;
+        len -= n * 512;
+        s->sector += n;
+        s->sector_count -= n;
+    }
+
+    if (len >= 512)
+        return 1;
+
+    if (len && s->sector_count) {
+        /* Recurse to complete the partial write.  */
+        return scsi_write_data(s, data, len);
+    }
+
+    if (len != 0)
+        return 1;
+
+    if (s->sector_count == 0)
+        scsi_command_complete(s, SENSE_NO_SENSE);
+
+    return 0;
+}
+
+/* Execute a scsi command.  Returns the length of the data expected by the
+   command.  This will be Positive for data transfers from the device
+   (eg. disk reads), negative for transfers to the device (eg. disk writes),
+   and zero if the command does not transfer any data.  */
+
+int32_t scsi_send_command(SCSIDevice *s, uint32_t tag, uint8_t *buf, int lun)
+{
+    int64_t nb_sectors;
+    uint32_t lba;
+    uint32_t len;
+    int cmdlen;
+    int is_write;
+
+    s->command = buf[0];
+    s->tag = tag;
+    s->sector_count = 0;
+    s->buf_pos = 0;
+    s->buf_len = 0;
+    is_write = 0;
+    DPRINTF("Command: 0x%02x", buf[0]);
+    switch (s->command >> 5) {
+    case 0:
+        lba = buf[3] | (buf[2] << 8) | ((buf[1] & 0x1f) << 16);
+        len = buf[4];
+        cmdlen = 6;
+        break;
+    case 1:
+    case 2:
+        lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
+        len = buf[8] | (buf[7] << 8);
+        cmdlen = 10;
+        break;
+    case 4:
+        lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
+        len = buf[13] | (buf[12] << 8) | (buf[11] << 16) | (buf[10] << 24);
+        cmdlen = 16;
+        break;
+    case 5:
+        lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24);
+        len = buf[9] | (buf[8] << 8) | (buf[7] << 16) | (buf[6] << 24);
+        cmdlen = 12;
+        break;
+    default:
+        BADF("Unsupported command length, command %x\n", s->command);
+        goto fail;
+    }
+#ifdef DEBUG_SCSI
+    {
+        int i;
+        for (i = 1; i < cmdlen; i++) {
+            printf(" 0x%02x", buf[i]);
+        }
+        printf("\n");
+    }
+#endif
+    if (lun || buf[1] >> 5) {
+        /* Only LUN 0 supported.  */
+        DPRINTF("Unimplemented LUN %d\n", lun ? lun : buf[1] >> 5);
+        goto fail;
+    }
+    switch (s->command) {
+    case 0x0:
+	DPRINTF("Test Unit Ready\n");
+	break;
+    case 0x03:
+        DPRINTF("Request Sense (len %d)\n", len);
+        if (len < 4)
+            goto fail;
+        memset(buf, 0, 4);
+        s->buf[0] = 0xf0;
+        s->buf[1] = 0;
+        s->buf[2] = s->sense;
+        s->buf_len = 4;
+        break;
+    case 0x12:
+        DPRINTF("Inquiry (len %d)\n", len);
+        if (len < 36) {
+            BADF("Inquiry buffer too small (%d)\n", len);
+        }
+	memset(s->buf, 0, 36);
+	if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
+	    s->buf[0] = 5;
+            s->buf[1] = 0x80;
+	    memcpy(&s->buf[16], "QEMU CD-ROM    ", 16);
+	} else {
+	    s->buf[0] = 0;
+	    memcpy(&s->buf[16], "QEMU HARDDISK  ", 16);
+	}
+	memcpy(&s->buf[8], "QEMU   ", 8);
+        memcpy(&s->buf[32], QEMU_VERSION, 4);
+        /* Identify device as SCSI-3 rev 1.
+           Some later commands are also implemented. */
+	s->buf[2] = 3;
+	s->buf[3] = 2; /* Format 2 */
+	s->buf[4] = 32;
+	s->buf_len = 36;
+	break;
+    case 0x16:
+        DPRINTF("Reserve(6)\n");
+        if (buf[1] & 1)
+            goto fail;
+        break;
+    case 0x17:
+        DPRINTF("Release(6)\n");
+        if (buf[1] & 1)
+            goto fail;
+        break;
+    case 0x1a:
+    case 0x5a:
+        {
+            char *p;
+            int page;
+
+            page = buf[2] & 0x3f;
+            DPRINTF("Mode Sense (page %d, len %d)\n", page, len);
+            p = s->buf;
+            memset(p, 0, 4);
+            s->buf[1] = 0; /* Default media type.  */
+            s->buf[3] = 0; /* Block descriptor length.  */
+            if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
+                s->buf[2] = 0x80; /* Readonly.  */
+            }
+            p += 4;
+            if ((page == 8 || page == 0x3f)) {
+                /* Caching page.  */
+                p[0] = 8;
+                p[1] = 0x12;
+                p[2] = 4; /* WCE */
+                p += 19;
+            }
+            if ((page == 0x3f || page == 0x2a)
+                    && (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM)) {
+                /* CD Capabilities and Mechanical Status page. */
+                p[0] = 0x2a;
+                p[1] = 0x14;
+                p[2] = 3; // CD-R & CD-RW read
+                p[3] = 0; // Writing not supported
+                p[4] = 0x7f; /* Audio, composite, digital out,
+                                         mode 2 form 1&2, multi session */
+                p[5] = 0xff; /* CD DA, DA accurate, RW supported,
+                                         RW corrected, C2 errors, ISRC,
+                                         UPC, Bar code */
+                p[6] = 0x2d | (bdrv_is_locked(s->bdrv)? 2 : 0);
+                /* Locking supported, jumper present, eject, tray */
+                p[7] = 0; /* no volume & mute control, no
+                                      changer */
+                p[8] = (50 * 176) >> 8; // 50x read speed
+                p[9] = (50 * 176) & 0xff;
+                p[10] = 0 >> 8; // No volume
+                p[11] = 0 & 0xff;
+                p[12] = 2048 >> 8; // 2M buffer
+                p[13] = 2048 & 0xff;
+                p[14] = (16 * 176) >> 8; // 16x read speed current
+                p[15] = (16 * 176) & 0xff;
+                p[18] = (16 * 176) >> 8; // 16x write speed
+                p[19] = (16 * 176) & 0xff;
+                p[20] = (16 * 176) >> 8; // 16x write speed current
+                p[21] = (16 * 176) & 0xff;
+                p += 21;
+            }
+            s->buf_len = p - s->buf;
+            s->buf[0] = s->buf_len - 4;
+            if (s->buf_len > len)
+                s->buf_len = len;
+        }
+        break;
+    case 0x1b:
+        DPRINTF("Start Stop Unit\n");
+	break;
+    case 0x1e:
+        DPRINTF("Prevent Allow Medium Removal (prevent = %d)\n", buf[4] & 3);
+        bdrv_set_locked(s->bdrv, buf[4] & 1);
+	break;
+    case 0x25:
+	DPRINTF("Read Capacity\n");
+        /* The normal LEN field for this command is zero.  */
+	memset(s->buf, 0, 8);
+	bdrv_get_geometry(s->bdrv, &nb_sectors);
+	s->buf[0] = (nb_sectors >> 24) & 0xff;
+	s->buf[1] = (nb_sectors >> 16) & 0xff;
+	s->buf[2] = (nb_sectors >> 8) & 0xff;
+	s->buf[3] = nb_sectors & 0xff;
+	s->buf[4] = 0;
+	s->buf[5] = 0;
+        s->buf[6] = s->cluster_size * 2;
+	s->buf[7] = 0;
+	s->buf_len = 8;
+	break;
+    case 0x08:
+    case 0x28:
+        DPRINTF("Read (sector %d, count %d)\n", lba, len);
+        s->sector = lba * s->cluster_size;
+        s->sector_count = len * s->cluster_size;
+        break;
+    case 0x0a:
+    case 0x2a:
+        DPRINTF("Write (sector %d, count %d)\n", lba, len);
+        s->sector = lba * s->cluster_size;
+        s->sector_count = len * s->cluster_size;
+        is_write = 1;
+        break;
+    case 0x35:
+        DPRINTF("Syncronise cache (sector %d, count %d)\n", lba, len);
+        bdrv_flush(s->bdrv);
+        break;
+    case 0x43:
+        {
+            int start_track, format, msf, toclen;
+
+            msf = buf[1] & 2;
+            format = buf[2] & 0xf;
+            start_track = buf[6];
+            bdrv_get_geometry(s->bdrv, &nb_sectors);
+            DPRINTF("Read TOC (track %d format %d msf %d)\n", start_track, format, msf >> 1);
+            switch(format) {
+            case 0:
+                toclen = cdrom_read_toc(nb_sectors, s->buf, msf, start_track);
+                break;
+            case 1:
+                /* multi session : only a single session defined */
+                toclen = 12;
+                memset(s->buf, 0, 12);
+                s->buf[1] = 0x0a;
+                s->buf[2] = 0x01;
+                s->buf[3] = 0x01;
+                break;
+            case 2:
+                toclen = cdrom_read_toc_raw(nb_sectors, s->buf, msf, start_track);
+                break;
+            default:
+                goto error_cmd;
+            }
+            if (toclen > 0) {
+                if (len > toclen)
+                  len = toclen;
+                s->buf_len = len;
+                break;
+            }
+        error_cmd:
+            DPRINTF("Read TOC error\n");
+            goto fail;
+        }
+    case 0x46:
+        DPRINTF("Get Configuration (rt %d, maxlen %d)\n", buf[1] & 3, len);
+        memset(s->buf, 0, 8);
+        /* ??? This shoud probably return much more information.  For now
+           just return the basic header indicating the CD-ROM profile.  */
+        s->buf[7] = 8; // CD-ROM
+        s->buf_len = 8;
+        break;
+    case 0x56:
+        DPRINTF("Reserve(10)\n");
+        if (buf[1] & 3)
+            goto fail;
+        break;
+    case 0x57:
+        DPRINTF("Release(10)\n");
+        if (buf[1] & 3)
+            goto fail;
+        break;
+    case 0xa0:
+        DPRINTF("Report LUNs (len %d)\n", len);
+        if (len < 16)
+            goto fail;
+        memset(s->buf, 0, 16);
+        s->buf[3] = 8;
+        s->buf_len = 16;
+        break;
+    default:
+	DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]);
+    fail:
+        scsi_command_complete(s, SENSE_ILLEGAL_REQUEST);
+	return 0;
+    }
+    if (s->sector_count == 0 && s->buf_len == 0) {
+        scsi_command_complete(s, SENSE_NO_SENSE);
+    }
+    len = s->sector_count * 512 + s->buf_len;
+    return is_write ? -len : len;
+}
+
+void scsi_disk_destroy(SCSIDevice *s)
+{
+    bdrv_close(s->bdrv);
+    qemu_free(s);
+}
+
+SCSIDevice *scsi_disk_init(BlockDriverState *bdrv,
+                           scsi_completionfn completion,
+                           void *opaque)
+{
+    SCSIDevice *s;
+
+    s = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
+    s->bdrv = bdrv;
+    s->completion = completion;
+    s->opaque = opaque;
+    if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
+        s->cluster_size = 4;
+    } else {
+        s->cluster_size = 1;
+    }
+
+    return s;
+}
+