cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nsp_message.c (2158B)

      1/*==========================================================================
      2  NinjaSCSI-3 message handler
      3      By: YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>
      4
      5   This software may be used and distributed according to the terms of
      6   the GNU General Public License.
      7 */
      8
      9/* $Id: nsp_message.c,v 1.6 2003/07/26 14:21:09 elca Exp $ */
     10
     11static void nsp_message_in(struct scsi_cmnd *SCpnt)
     12{
     13	unsigned int  base = SCpnt->device->host->io_port;
     14	nsp_hw_data  *data = (nsp_hw_data *)SCpnt->device->host->hostdata;
     15	unsigned char data_reg, control_reg;
     16	int           ret, len;
     17
     18	/*
     19	 * XXX: NSP QUIRK
     20	 * NSP invoke interrupts only in the case of scsi phase changes,
     21	 * therefore we should poll the scsi phase here to catch 
     22	 * the next "msg in" if exists (no scsi phase changes).
     23	 */
     24	ret = 16;
     25	len = 0;
     26
     27	nsp_dbg(NSP_DEBUG_MSGINOCCUR, "msgin loop");
     28	do {
     29		/* read data */
     30		data_reg = nsp_index_read(base, SCSIDATAIN);
     31
     32		/* assert ACK */
     33		control_reg = nsp_index_read(base, SCSIBUSCTRL);
     34		control_reg |= SCSI_ACK;
     35		nsp_index_write(base, SCSIBUSCTRL, control_reg);
     36		nsp_negate_signal(SCpnt, BUSMON_REQ, "msgin<REQ>");
     37
     38		data->MsgBuffer[len] = data_reg; len++;
     39
     40		/* deassert ACK */
     41		control_reg =  nsp_index_read(base, SCSIBUSCTRL);
     42		control_reg &= ~SCSI_ACK;
     43		nsp_index_write(base, SCSIBUSCTRL, control_reg);
     44
     45		/* catch a next signal */
     46		ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_IN, BUSMON_REQ);
     47	} while (ret > 0 && MSGBUF_SIZE > len);
     48
     49	data->MsgLen = len;
     50
     51}
     52
     53static void nsp_message_out(struct scsi_cmnd *SCpnt)
     54{
     55	nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata;
     56	int ret = 1;
     57	int len = data->MsgLen;
     58
     59	/*
     60	 * XXX: NSP QUIRK
     61	 * NSP invoke interrupts only in the case of scsi phase changes,
     62	 * therefore we should poll the scsi phase here to catch 
     63	 * the next "msg out" if exists (no scsi phase changes).
     64	 */
     65
     66	nsp_dbg(NSP_DEBUG_MSGOUTOCCUR, "msgout loop");
     67	do {
     68		if (nsp_xfer(SCpnt, BUSPHASE_MESSAGE_OUT)) {
     69			nsp_msg(KERN_DEBUG, "msgout: xfer short");
     70		}
     71
     72		/* catch a next signal */
     73		ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_OUT, BUSMON_REQ);
     74	} while (ret > 0 && len-- > 0);
     75
     76}
     77
     78/* end */