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scsi-disk: adjust offsets in MODE SENSE by 2

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This will make offsets the same when implementing MODE SELECT.  This is
because MODE SELECT has to deal with both 2-byte and 4-byte headers.
Unfortunately, this means that the offsets are now off by two compared
to the descriptions in the SCSI specs, which include the header.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-07-12 16:08:24 +02:00
parent af6d510ddb
commit ef40561116
1 changed files with 74 additions and 66 deletions
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140
hw/scsi-disk.c
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@ -959,148 +959,156 @@ static int mode_sense_page(SCSIDiskState *s, int page, uint8_t **p_outbuf,
[MODE_PAGE_AUDIO_CTL] = (1 << TYPE_ROM),
[MODE_PAGE_CAPABILITIES] = (1 << TYPE_ROM),
};
uint8_t *p = *p_outbuf;
uint8_t *p = *p_outbuf + 2;
int length;
if ((mode_sense_valid[page] & (1 << s->qdev.type)) == 0) {
return -1;
}
p[0] = page;
/*
* If Changeable Values are requested, a mask denoting those mode parameters
* that are changeable shall be returned. As we currently don't support
* parameter changes via MODE_SELECT all bits are returned set to zero.
* The buffer was already menset to zero by the caller of this function.
*
* The offsets here are off by two compared to the descriptions in the
* SCSI specs, because those include a 2-byte header. This is unfortunate,
* but it is done so that offsets are consistent within our implementation
* of MODE SENSE and MODE SELECT. MODE SELECT has to deal with both
* 2-byte and 4-byte headers.
*/
switch (page) {
case MODE_PAGE_HD_GEOMETRY:
p[1] = 0x16;
length = 0x16;
if (page_control == 1) { /* Changeable Values */
break;
}
/* if a geometry hint is available, use it */
p[2] = (s->qdev.conf.cyls >> 16) & 0xff;
p[3] = (s->qdev.conf.cyls >> 8) & 0xff;
p[4] = s->qdev.conf.cyls & 0xff;
p[5] = s->qdev.conf.heads & 0xff;
p[0] = (s->qdev.conf.cyls >> 16) & 0xff;
p[1] = (s->qdev.conf.cyls >> 8) & 0xff;
p[2] = s->qdev.conf.cyls & 0xff;
p[3] = s->qdev.conf.heads & 0xff;
/* Write precomp start cylinder, disabled */
p[6] = (s->qdev.conf.cyls >> 16) & 0xff;
p[7] = (s->qdev.conf.cyls >> 8) & 0xff;
p[8] = s->qdev.conf.cyls & 0xff;
p[4] = (s->qdev.conf.cyls >> 16) & 0xff;
p[5] = (s->qdev.conf.cyls >> 8) & 0xff;
p[6] = s->qdev.conf.cyls & 0xff;
/* Reduced current start cylinder, disabled */
p[9] = (s->qdev.conf.cyls >> 16) & 0xff;
p[10] = (s->qdev.conf.cyls >> 8) & 0xff;
p[11] = s->qdev.conf.cyls & 0xff;
p[7] = (s->qdev.conf.cyls >> 16) & 0xff;
p[8] = (s->qdev.conf.cyls >> 8) & 0xff;
p[9] = s->qdev.conf.cyls & 0xff;
/* Device step rate [ns], 200ns */
p[12] = 0;
p[13] = 200;
p[10] = 0;
p[11] = 200;
/* Landing zone cylinder */
p[12] = 0xff;
p[13] = 0xff;
p[14] = 0xff;
p[15] = 0xff;
p[16] = 0xff;
/* Medium rotation rate [rpm], 5400 rpm */
p[20] = (5400 >> 8) & 0xff;
p[21] = 5400 & 0xff;
p[18] = (5400 >> 8) & 0xff;
p[19] = 5400 & 0xff;
break;
case MODE_PAGE_FLEXIBLE_DISK_GEOMETRY:
p[1] = 0x1e;
length = 0x1e;
if (page_control == 1) { /* Changeable Values */
break;
}
/* Transfer rate [kbit/s], 5Mbit/s */
p[2] = 5000 >> 8;
p[3] = 5000 & 0xff;
p[0] = 5000 >> 8;
p[1] = 5000 & 0xff;
/* if a geometry hint is available, use it */
p[4] = s->qdev.conf.heads & 0xff;
p[5] = s->qdev.conf.secs & 0xff;
p[6] = s->qdev.blocksize >> 8;
p[2] = s->qdev.conf.heads & 0xff;
p[3] = s->qdev.conf.secs & 0xff;
p[4] = s->qdev.blocksize >> 8;
p[6] = (s->qdev.conf.cyls >> 8) & 0xff;
p[7] = s->qdev.conf.cyls & 0xff;
/* Write precomp start cylinder, disabled */
p[8] = (s->qdev.conf.cyls >> 8) & 0xff;
p[9] = s->qdev.conf.cyls & 0xff;
/* Write precomp start cylinder, disabled */
/* Reduced current start cylinder, disabled */
p[10] = (s->qdev.conf.cyls >> 8) & 0xff;
p[11] = s->qdev.conf.cyls & 0xff;
/* Reduced current start cylinder, disabled */
p[12] = (s->qdev.conf.cyls >> 8) & 0xff;
p[13] = s->qdev.conf.cyls & 0xff;
/* Device step rate [100us], 100us */
p[14] = 0;
p[15] = 1;
p[12] = 0;
p[13] = 1;
/* Device step pulse width [us], 1us */
p[16] = 1;
p[14] = 1;
/* Device head settle delay [100us], 100us */
p[17] = 0;
p[18] = 1;
p[15] = 0;
p[16] = 1;
/* Motor on delay [0.1s], 0.1s */
p[19] = 1;
p[17] = 1;
/* Motor off delay [0.1s], 0.1s */
p[20] = 1;
p[18] = 1;
/* Medium rotation rate [rpm], 5400 rpm */
p[28] = (5400 >> 8) & 0xff;
p[29] = 5400 & 0xff;
p[26] = (5400 >> 8) & 0xff;
p[27] = 5400 & 0xff;
break;
case MODE_PAGE_CACHING:
p[0] = 8;
p[1] = 0x12;
length = 0x12;
if (page_control == 1) { /* Changeable Values */
break;
}
if (bdrv_enable_write_cache(s->qdev.conf.bs)) {
p[2] = 4; /* WCE */
p[0] = 4; /* WCE */
}
break;
case MODE_PAGE_R_W_ERROR:
p[1] = 10;
p[2] = 0x80; /* Automatic Write Reallocation Enabled */
length = 10;
p[0] = 0x80; /* Automatic Write Reallocation Enabled */
if (s->qdev.type == TYPE_ROM) {
p[3] = 0x20; /* Read Retry Count */
p[1] = 0x20; /* Read Retry Count */
}
break;
case MODE_PAGE_AUDIO_CTL:
p[1] = 14;
length = 14;
break;
case MODE_PAGE_CAPABILITIES:
p[1] = 0x14;
length = 0x14;
if (page_control == 1) { /* Changeable Values */
break;
}
p[2] = 0x3b; /* CD-R & CD-RW read */
p[3] = 0; /* Writing not supported */
p[4] = 0x7f; /* Audio, composite, digital out,
p[0] = 0x3b; /* CD-R & CD-RW read */
p[1] = 0; /* Writing not supported */
p[2] = 0x7f; /* Audio, composite, digital out,
mode 2 form 1&2, multi session */
p[5] = 0xff; /* CD DA, DA accurate, RW supported,
p[3] = 0xff; /* CD DA, DA accurate, RW supported,
RW corrected, C2 errors, ISRC,
UPC, Bar code */
p[6] = 0x2d | (s->tray_locked ? 2 : 0);
p[4] = 0x2d | (s->tray_locked ? 2 : 0);
/* Locking supported, jumper present, eject, tray */
p[7] = 0; /* no volume & mute control, no
p[5] = 0; /* no volume & mute control, no
changer */
p[8] = (50 * 176) >> 8; /* 50x read speed */
p[9] = (50 * 176) & 0xff;
p[10] = 2 >> 8; /* Two volume levels */
p[11] = 2 & 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[6] = (50 * 176) >> 8; /* 50x read speed */
p[7] = (50 * 176) & 0xff;
p[8] = 2 >> 8; /* Two volume levels */
p[9] = 2 & 0xff;
p[10] = 2048 >> 8; /* 2M buffer */
p[11] = 2048 & 0xff;
p[12] = (16 * 176) >> 8; /* 16x read speed current */
p[13] = (16 * 176) & 0xff;
p[16] = (16 * 176) >> 8; /* 16x write speed */
p[17] = (16 * 176) & 0xff;
p[18] = (16 * 176) >> 8; /* 16x write speed current */
p[19] = (16 * 176) & 0xff;
p[20] = (16 * 176) >> 8; /* 16x write speed current */
p[21] = (16 * 176) & 0xff;
break;
default:
return -1;
}
*p_outbuf += p[1] + 2;
return p[1] + 2;
assert(length < 256);
(*p_outbuf)[0] = page;
(*p_outbuf)[1] = length;
*p_outbuf += length + 2;
return length + 2;
}
static int scsi_disk_emulate_mode_sense(SCSIDiskReq *r, uint8_t *outbuf)