Cisco IOS for S/390 Planning Guide

Exit Work Area

If requested, the exit facility provides a work area to the exit program upon each invocation, except the INIT exit point. Request the work area with the EWALENGTH parameter of the EXIT statement in member IJTCFGxx, or with a parameter returned by the program at the INIT exit point (the program parameter taking precedence).

The Exit Work Area (EWA) addressed will be passed to the exit program at each exit point as the fifth parameter, following the address of the message-writing routine.

Note The parameter lists for all exit points must be updated.

The EWA size can be from 1 to 65532 bytes. It is taken from pooled storage; the smallest pool that will satisfy the requested size will be used. Pool usage can be monitored via the IFS POOL command. One of the following pools will be used:

Table 3

EWA Pools

 

 

Pool Name

EWA Size

 

 

256B

1-252

 

 

512B

253-508

 

 

01KB

509-1020

 

 

04KB

1021-4092

 

 

08KB

4093-8188

 

 

16KB

8189-65532

 

 

Note These figures are provided to allow the exit program designer to make efficient use of the EWA buffers. It is important that the exit use only the size requested on the EWALENGTH parameter, or by the INIT exit. The exit facility monitors the exit program's use of the EWA, and will force an ABEND if an overrun is detected, even if space remains in the buffer.

Add the following parameters to the INIT exit parameter list, following the subsystem ID address:

Table 4

INIT Exit Parameters

 

 

 

 

 

Parameter

Data

 

Offset

Length

Length

Description

 

 

 

 

32

04

04

The address of the four-byte Cisco IOS for S/390 subsystem ID.

 

 

 

 

36

04

04

The address of a fullword area in which the exit program may put the

 

 

 

size of the EWA to be obtained.

 

 

 

 

40

04

04

The address of a fullword area in which the exit program may put the

 

 

 

address of a recovery routine to be called in the event the exit program

 

 

 

ABENDs at a subsequent entry point.

 

 

 

 

Cisco IOS for S/390 Release 2.0 Release Notes 11

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Cisco Systems S/390 manual Exit Work Area
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S/390 specifications

Cisco Systems S/390, also known as IBM's S/390 architecture, is a revolutionary mainframe computing solution that has significantly impacted enterprise computing since its introduction. Though primarily associated with IBM, its integration with Cisco Systems technologies has fostered enhanced networking capabilities, creating a robust platform for organizations to leverage.

One of the most notable features of the S/390 architecture is its scalability. The system is designed to manage workloads efficiently, enabling organizations to scale their operations seamlessly as their requirements grow. This architecture supports an extensive range of applications, from transaction processing to complex data analysis, making it suitable for diverse industries.

The S/390 systems are known for their reliability and resilience. With advanced error detection and correction mechanisms, the architecture minimizes downtime, ensuring that mission-critical applications remain operational. The mainframe's design accommodates redundancy and fault tolerance, reinforcing its reputation as a dependable computing solution.

Moreover, security is a core characteristic of the S/390 infrastructure. It incorporates various security features, such as encryption and robust access control mechanisms, to safeguard sensitive data against unauthorized access and cyber threats. This level of security is particularly critical for industries such as finance, healthcare, and government, where data protection is paramount.

The integration of Cisco networking technologies with the S/390 architecture brings enhanced connectivity and streamlined communication capabilities. Cisco’s advanced routing, switching, and security solutions bolster the mainframe's communication prowess, enabling organizations to create seamless, high-performance networks. This ensures that data flows efficiently between the mainframe and other networked devices.

Additionally, S/390 supports an array of middleware solutions, facilitating better interoperability with modern applications and cloud services. Organizations can take advantage of this flexibility to leverage existing investments in technology while embracing innovative solutions.

In summary, Cisco Systems S/390 embodies a potent combination of scalability, reliability, security, and advanced networking features. Its architecture serves as a cornerstone for enterprise computing, allowing organizations to meet their evolving business needs while maintaining high-performance standards. As businesses increasingly rely on data-driven decision-making, S/390 remains a critical asset for organizations striving for efficiency and innovation in their operations.
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