diff options
| -rw-r--r-- | hw/scsi-bus.c | 16 | ||||
| -rw-r--r-- | hw/scsi-defs.h | 8 |
2 files changed, 23 insertions, 1 deletions
diff --git a/hw/scsi-bus.c b/hw/scsi-bus.c index 9c64e30279..5ad1013be1 100644 --- a/hw/scsi-bus.c +++ b/hw/scsi-bus.c @@ -901,7 +901,21 @@ static int scsi_req_stream_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *bu cmd->xfer = buf[13] | (buf[12] << 8); break; case READ_POSITION: - cmd->xfer = buf[8] | (buf[7] << 8); + switch (buf[1] & 0x1f) /* operation code */ { + case SHORT_FORM_BLOCK_ID: + case SHORT_FORM_VENDOR_SPECIFIC: + cmd->xfer = 20; + break; + case LONG_FORM: + cmd->xfer = 32; + break; + case EXTENDED_FORM: + cmd->xfer = buf[8] | (buf[7] << 8); + break; + default: + return -1; + } + break; case FORMAT_UNIT: cmd->xfer = buf[4] | (buf[3] << 8); diff --git a/hw/scsi-defs.h b/hw/scsi-defs.h index ade82a488f..8a73f745ba 100644 --- a/hw/scsi-defs.h +++ b/hw/scsi-defs.h @@ -147,6 +147,14 @@ #define SAI_READ_CAPACITY_16 0x10 /* + * READ POSITION service action codes + */ +#define SHORT_FORM_BLOCK_ID 0x00 +#define SHORT_FORM_VENDOR_SPECIFIC 0x01 +#define LONG_FORM 0x06 +#define EXTENDED_FORM 0x08 + +/* * SAM Status codes */ |