ISO/IEC INTERNATIONAL STANDARD 9316-2 First edition 2000-06 Information technology - Small computer system interface-2 (ScSl-2) - Part 2: Common Access Method (CAM) Transport and ScSl interface module Reference number ISO/IEC 9316-2:2000(E) Copvriaht International Oraanization for Standardizatior ISO/IEC INTERNATIONAL STANDARD 9316-2 First edition 2000-06 Information technology - Small computer system interface-2 (scSl-2) - Part 2: Common Access Method (CAM) Transport and Scsl interface module @ ISO/IEC 2000 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any PRICE CODE XA IEO OS1 9316-2 @ ISO/IEC:2000(E) CONTENTS Page FOREWORD 6 INTRODUCTION Clause 1 Scope... 9 2 Conformance .9 3 Normative references ...... 4 Definitions. .10 5 Conventions 6 General description .. 6.1 General. 6.2 Environment, 6.3 Peripheral driver functions...... 6.4 XPT functions. 14 6.5 SIM functions . 14 7 Background 14 7.1 General. 14 7.2 Software.. 14 7.3 CAM (Common Access Method) 7.4 OSD (Operating System Dependencies) 15 7.5 Architectural considerations 8 Principles of operation. 16 8.1 Accessing the XPT 8.2 Initialization. 8.3 CCB completion 8.3.1 Completion of immediate CCB 8.3.2 Completion of queued CCB 8.4 scsl request queues 18 8.4.1 The logical unit and the peripheral driver. 18 8.4.2 SIM queuing .. 18 8.5 SIM handling of SCsI resets.. .20 8.6 Asynchronous event callback . ..21 8.7 Autosense.... .23 8.8 Loadable modules ... OsD (operating system dependent) operation ,25 9.1 UNIVOs operating system.... ..25 9.1.1 Initialization.... ..25 9.1.2 Accessing the Xp- 9.1.3 Callback on completion... ..26 9.1.4 Pointer definition in the UNIVOS environment. .26 9.1.5 Request mapping information . 9.1.6 XPT interface .27 9.1.7 SIM interface. .28 9.2 9.2.1 Initialization...... .28 9.2.2 SIM and peripheral driver unloading, .29 9.2.3 Accessing the XPT. .30 9.2.4 Hardware registration. .30 9.2.5 Miscellaneous . ..30 9316-2 @ ISO/IEC:2000(E) - 3 - Clause Page 9.3 DOs (disk operating system) .31 9.3.1 Initialization... .31 9.3.2 Accessing the XPT. ..32 9.3.3 Callback on completion . 9.3.4 Asynchronous event callbacks..... 9.3.5 10 CAM control blocks... ..34 10.1 CCB header fields .. 10.1.1 Address of this CCB... ..36 10.1.2 CAM control block length..... 10.1.3 XPT function code. 10.1.4 CAM status 10.1.5 Connect ID.. .39 10.1.6 CAM flags .39 10.2 Function codes. .39 10.2.1 NOP. .39 10.2.2 Get device type .40 10.2.3 Path inquiry ..... 10.2.4 Release SiM queue ... .43 10.2.5 Scan SCSI bus... .44 10.2.6 Scan logical unit... .45 10.2.7 Set asynchronous callback. .45 10.2.8 Set device type .... 10.3 ScsI control functions.... 10.3.1 Abort ScSI command .47 10.3.2 Reset ScsI bus....... ..48 10.3.3 Reset ScsI device .. .49 10.3.4 Terminate I/O process .. .49 11 CAM control block to request I/O.. 11.1 Field descriptions for CAM control blocks to request I/O 11.1.1 Autosense Residual Length.. 51 11.1.2 Callback on completion ... .51 11.1.3 CAM flags .... .51 11.1.4 CDB .55 11.1.5 CDB length... 11.1.6 Data transfer length.... 11.1.7 Function code ... 11.1.8 Initiator ID..... .55 11.1.9 Message buffer length (target-only). .55 11.1.10 Message buffer pointer (target-only)... .55 11.1.11 Next CCB pointer .... ..56 11.1.12 Number of scatter/gather entries .. 11.1.13 Peripheral driver pointer..... 11.1.14 Private data.. 11.1.15 Request mapping information ... ..56 11.1.16 Residual length . .56 11.1.17 ScSI status .56 11.1.18 Sense info buffer length .56 9316-2 @ ISO/IEC:2000(E) - 3 - Clause Page 9.3 DOs (disk operating system) .31 9.3.1 Initialization... .31 9.3.2 Accessing the XPT. ..32 9.3.3 Callback on completion . 9.3.4 Asynchronous event callbacks..... 9.3.5 10 CAM control blocks... ..34 10.1 CCB header fields .. 10.1.1 Address of this CCB... ..36 10.1.2 CAM control block length..... 10.1.3 XPT function code. 10.1.4 CAM status 10.1.5 Connect ID.. .39 10.1.6 CAM flags .39 10.2 Function codes. .39