static int scsi_read_dvd_structure(SCSIDiskState *s, SCSIDiskReq *r, uint8_t *outbuf) { static const int rds_caps_size[5] = { [0] = 2048 + 4, [1] = 4 + 4, [3] = 188 + 4, [4] = 2048 + 4, }; uint8_t media = r->req.cmd.buf[1]; uint8_t layer = r->req.cmd.buf[6]; uint8_t format = r->req.cmd.buf[7]; int size = -1; if (s->qdev.type != TYPE_ROM) { return -1; } if (media != 0) { scsi_check_condition(r, SENSE_CODE(INVALID_FIELD)); return -1; } if (format != 0xff) { if (s->tray_open || !bdrv_is_inserted(s->qdev.conf.bs)) { scsi_check_condition(r, SENSE_CODE(NO_MEDIUM)); return -1; } if (media_is_cd(s)) { scsi_check_condition(r, SENSE_CODE(INCOMPATIBLE_FORMAT)); return -1; } if (format >= ARRAY_SIZE(rds_caps_size)) { return -1; } size = rds_caps_size[format]; memset(outbuf, 0, size); } switch (format) { case 0x00: { /* Physical format information */ uint64_t nb_sectors; if (layer != 0) { goto fail; } bdrv_get_geometry(s->qdev.conf.bs, &nb_sectors); outbuf[4] = 1; /* DVD-ROM, part version 1 */ outbuf[5] = 0xf; /* 120mm disc, minimum rate unspecified */ outbuf[6] = 1; /* one layer, read-only (per MMC-2 spec) */ outbuf[7] = 0; /* default densities */ stl_be_p(&outbuf[12], (nb_sectors >> 2) - 1); /* end sector */ stl_be_p(&outbuf[16], (nb_sectors >> 2) - 1); /* l0 end sector */ break; } case 0x01: /* DVD copyright information, all zeros */ break; case 0x03: /* BCA information - invalid field for no BCA info */ return -1; case 0x04: /* DVD disc manufacturing information, all zeros */ break; case 0xff: { /* List capabilities */ int i; size = 4; for (i = 0; i < ARRAY_SIZE(rds_caps_size); i++) { if (!rds_caps_size[i]) { continue; } outbuf[size] = i; outbuf[size + 1] = 0x40; /* Not writable, readable */ stw_be_p(&outbuf[size + 2], rds_caps_size[i]); size += 4; } break; } default: return -1; } /* Size of buffer, not including 2 byte size field */ stw_be_p(outbuf, size - 2); return size; fail: return -1; }