Method ModeSelect

cpp/devices/scsi_streamer.cpp:164–225

}

void SCSIST::ModeSelect(scsi_command cmd, cdb_t cdb, span<const uint8_t> buff, int length)
{
	/*
+=====-========-========-========-========-========-========-========-========+
|  Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
|Byte |        |        |        |        |        |        |        |        |
|=====+=======================================================================|
| 0   |                           Operation code (15h)                        |
|-----+-----------------------------------------------------------------------|
| 1   | Logical unit number      |   PF   |         Reserved         |  SP    |
|-----+-----------------------------------------------------------------------|
| 2   |                           Reserved                                    |
|-----+-----------------------------------------------------------------------|
| 3   |                           Reserved                                    |
|-----+-----------------------------------------------------------------------|
| 4   |                           Parameter list length                       |
|-----+-----------------------------------------------------------------------|
| 5   |                           Control                                     |
+=============================================================================+
*/
	if (cmd != scsi_command::eCmdModeSelect6 || length < 12)
		throw scsi_exception(sense_key::illegal_request, asc::invalid_command_operation_code);

	// If the PF-bit is set to zero, the
	// Drive will not accept any Mode Pages in the parameter list; only the
	// Header List and a Block Descriptor List will be accepted. If the Drive
	// receives a parameter list containing bytes beyond the Header List and a
	// Block Descriptor List, it will terminate the MODE SELECT command
	// with CHECK CONDITION and set the Sense Key to ILLEGAL REQUEST and the AS/AQ sense bytes to PARAMETER LIST LENGTH
	// ERROR. The Error Code will be set to E$STE_PLEN.
	bool pf = cdb[1] & 0x10;


	// A Save Page (SP) bit of zero indicates that the Drive will perform the
	// specified MODE SELECT operation, but not save any mode parameters.
	// A SP bit of one indicates that the Drive will perform the specified
	// MODE SELECT operation and also save all saveable MODE SELECT
	// parameters received during the DATA OUT phase.
	bool sp = cdb[1] & 0x01;// this one is tricky, should we have two sets of settings ?!?!?


	// This field specifies the length in bytes of the MODE SELECT parameter
	// list that will be transferred from the Initiator to the Drive during the
	// DATA OUT phase. A Parameter List Length of zero indicates that no
	// data will be transferred. No mode selection parameters are then
	// changed. A parameter list length must never result in the truncation of
	// any header, descriptor or page of parameters.
	uint8_t params_list_len = cdb[4] & 0xff;
	if ((!pf && params_list_len != 12) || params_list_len < 12 || params_list_len > length)
		throw scsi_exception(sense_key::illegal_request, asc::parameter_list_length_error);

	// Header List

	// Check Block Descriptor Length
	if (buff[3] != 0x08)
		throw scsi_exception(sense_key::illegal_request, asc::invalid_field_in_parameter_list);

	// Block Descriptor List