Method and apparatus for providing hot swapping capability in a computer system with static peripheral driver software

• US 5,781,798 A
• Filed: 11/18/1996
• Issued: 07/14/1998
• Est. Priority Date: 12/30/1993
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Beatty, Dana Lynn, Nishida, Yoshi, Hamm, Richard E.
• Primary Examiner(s): Meky, Moustafa M.
• Application Number:
  US08/751,256
• Time in Patent Office: 603 Days
• Field of Search: 395/821-823, 395/828-830, 395/835-839, 395/280-284, 395/500, 395/651, 395/653
• US Class Current: 710/10
• CPC Class Codes: G06F 9/4411 Configuring for operating with peripheral devices; Loading of device drivers

Abstract

A computer system which utilizes a "static" peripheral device driver that recognizes configuration changes only on system initialization is modified to provide hot insertion capability. In particular, in order to provide hot insertion capability, software which allows operation with PCMCIA compatible peripherals is loaded into the computer and the static peripheral device driver is modified to communicate directly with the PCMCIA software. In this manner the conventional PCMCIA software recognizes hot insertions and removals and these vents are communicated to the static driver by means of internal data packets.

Claims

1. Apparatus for providing hot swapping capability in a computer system having an adapter card coupled, thereto the adapter card having a plurality of adapter slots and a peripheral device coupled to one of the adapter slots, the apparatus comprising:

a static peripheral device driver, stored in a memory of the computer, the static peripheral device driver for managing system resources associated with the peripheral device, the static peripheral device driver having a common portion and a device specific portion, wherein the common portion of the static peripheral device driver is normally operative to identify the peripheral device coupled to the computer system only during system initialization;

means for monitoring each of the plurality of adapter slots and for detecting when the peripheral device has been connected to the adapter slot and for detecting when the peripheral device has been disconnected from the adapter slot;

means cooperating with the monitoring means for generating a first inter-device communications data packet when the peripheral device has been connected to the adapter slot and for generating a second inter-device communications data packet when the peripheral device has been disconnected from the adapter slot; and

means for sending the first and second inter-device communications data packets to the common portion of said static peripheral device driver wherein;

in response to the first inter-device communications data packets the common portion of the static peripheral device driver installs system resources after system initialization has taken place; and

in response to the second inter-device communications data packet, the common portion of the static peripheral device driver releases system resources after system initialization has taken place.

2. Apparatus according to claim 1 wherein the means for generating comprises:

means for generating an identification code identifying the peripheral adapter slot; and

means for building the inter-device communications data packet, wherein the inter-device communications data packet includes;

a peripheral adapter slot identification code; and

a command code having a first value in response to a peripheral device being connected to the peripheral adapter slot and having a second value in response to the peripheral device being disconnected from the peripheral adapter slot.

3. Apparatus according to claim 2 wherein the common portion of the static peripheral device driver comprises:

means responsive to the command code for allocating system resources for the peripheral device when the peripheral device is connected to the computer system; and

means responsive to the command code of the inter-device communications data packet for releasing system resources for the peripheral device when the peripheral device is disconnected from the computer system.

4. Apparatus according to claim 1 further comprising:

means responsive to the installation and release of system resources for building a return inter-device communications data packet having data indicating whether the allocation and release of the system resources was successful; and

means for sending the return inter-device communications data packet from the static peripheral device driver to the means for monitoring.

5. Apparatus according to claim 1 wherein the peripheral device includes a configuration memory and wherein the means for monitoring comprises:

means for generating an identification code identifying the peripheral adapter slot;

means responsive to the identification code for interrogating the configuration memory and retrieving configuration information; and

means responsive to the retrieved configuration information for selecting a device-specific driver for the peripheral device.

6. Apparatus according to claim 1 wherein the common portion of the static peripheral device driver includes means for allocating and releasing system meory and data structures.

7. A computer system having hot swapping capability for a plurality of peripheral devices which can be connected to, or disconnected from, the computer system through a plurality of peripheral adapter slots, the computer system comprising:

static peripheral device driver software which manages system resources associated with each of the plurality of peripheral devices and is normally operative to identify a peripheral device coupled to the computer system only during system initialization;

means for determining when one of the plurality of peripheral devices has been connected to, and disconnected from, the computer system by examining registers which are associated with each peripheral adapter slot and which are physically located on a peripheral adapter;

means cooperating with the determining means for generating an identifying code identifying one of the peripheral adapter slots through which the one peripheral device has been connected to, and disconnected from, the computer system;

means cooperating with the determining means and the generating means for generating an inter-device communications data packet when the peripheral device has been connected to, and disconnected from, the computer system, the inter-device communications data packet having information indicating the identifying code and a command code indicating whether the peripheral device has been connected to, or disconnected from, the computer system;

means for sending the inter-device communications data packet to the static peripheral device driver; and

means responsive to the inter-device communications data packet for controlling the static peripheral device driver to allocate and release the system resources corresponding to the one peripheral device has been connected to, and disconnected from the computer system after system initialization has taken place.

8. A computer system according to claim 7 wherein the controlling means comprises:

means responsive to the command code for allocating system resources for the one peripheral device when the one peripheral device is connected to the computer system; and

means responsive to the command code for releasing system resources for the one peripheral device when the one periopheral device is disconnected from the computer system.

9. A computer system according to claim 8 further comprising:

means responsive to the allocation and release of system resources for building a return inter-device communications data packet having data indicating whether the allocation and release of the system resources was successful; and

means for sending the return inter-device communications data packet from the static peripheral device driver to the determining means.

10. A computer system comprising:

a computer having a plurality of card slots;

a plurality of peripheral devices, at least one of the plurality of peripheral devices conforming to a first standard which permits hot swapping of peripheral devices;

an adapter card having coupled thereto one of the plurality of peripheral devices conforming to the first standard which permits hot swapping of peripheral devices, the adapter card conforming to electrical, mechanical and timing specifications for one of the plurality of card slots and disposed in the one slot, the adapter card providing an interface between the computer and the one of the plurality of peripheral devices that conforms to the first standard which permits hot swapping of peripheral devices;

a static peripheral device driver operating in cooperation with the computer to support each of the plurality of peripheral devices coupled to the computer, the static peripheral device driver including a common portion and a device specific portion, the common portion for polling, only at the time of system initialization, each of the plurality of card slots to determine which of the plurality of card slots have a peripheral device coupled thereto;

a client driver which provides device-specific support to a predetermined type of peripheral device which also conforms to the first standard which permits hot swapping of peripheral devices, the client driver comprising a mechanism for generating control information packet for communicating card insertion and card removal information to the static peripheral device driver; and

wherein the static peripheral device driver further comprises means for receiving and interpreting the control information packet from the client driver and releasing or allocating system resources based on the control information packet after system initialization has taken place.

11. A computer system according to claim 10 wherein the client driver further comprises:

means for receiving and interpreting card insertion and card removal information; and

means for relaying the card insertion and card removal information to the static peripheral device driver.

12. A computer system according to claim 10 wherein the computer system employs an OS/2 operating system.

13. A computer system according to claim 10 wherein the first standard corresponds to a PCMCIA standard.

14. A method for providing hot swapping capability for a peripheral device in a computer system having static peripheral device driver software which manages system resources associated with the peripheral device and is normally operative to identify a peripheral device coupled to the computer system only during system initialization, the method comprising the steps of:

A. determining when the peripheral device has been connected to, and disconnected from, the computer system;

B. generating an inter-device communications data packet when the peripheral device has been connected to, and disconnected from, the computer system;

C. sending the inter-device communications data packet to the static peripheral device driver; and

D. using the inter-device communications data packet to control the static peripheral device driver to allocate and release the system resources associated with the peripheral device after system initialization has taken place.

15. A method according to claim 14 wherein the peripheral device is connected to the computer system through a peripheral adapter slot and wherein step A comprises the step of:

A1. monitoring the peripheral adapter slot.

16. A method according to claim 15 wherein step B comprises the steps of:

B1. generating an identification code identifying the peripheral adapter slot; and

B2. building an inter-device communications data packet which includes the peripheral adapter slot identification code and a command code indicating whether the peripheral device is connected to, or disconnected from, the computer system.

17. A method according to claim 16 wherein step D comprises the steps of:

D1. using the command code to allocate system resources for the peripheral device when the peripheral device is connected to the computer system; and

D2. using the command code to release system resources for the peripheral device when the peripheral device is disconnected from the computer system.

18. A method according to claim 14 further comprising the steps of:

E. building a return inter-device communications data packet having data indicating whether the allocation and release of the system resources was successful; and

F. sending the return inter-device communications data packet from the static peripheral device driver to the determining apparatus.

19. A method according to claim 14 wherein the peripheral device is connected to the computer system through a peripheral adapter slot and comprises a configuration memory and wherein step A comprises the steps of:

A2. generating an identification code identifying the peripheral adapter slot;

A3. interrogating the configuration memory and retrieving configuration information; and

A4. selecting a device-specific driver for the peripheral device.

20. A method according to claim 14 wherein step D comprises the step of:

D3. controlling the peripheral device driver to allocate and release system memory and data structures.

21. A method for permitting a computer system to continue operation when peripheral devices are hot swapped from the system, the computer system employing a static peripheral device driver which polls a plurality of peripheral ports only at system initialization to determine the peripheral port configuration and further employing adapters, peripheral devices, and software which conform to the PCMCIA standard, the method comprising the steps of:

A. obtaining card insertion/removal information from PCMCIA software modules;

B. requesting allocation of resources from PCMCIA software modules;

C. sending an inter-device communications packet from a PCMCIA device driver to the static peripheral device driver, the packet containing a command, an IRQ number, a communications port number, and a bus address;

D. forcing the static peripheral device driver to read the packet and respond to the command; and

E. Controlling the static peripheral device driver to allocate system resources and deallocate system resources in response to the command after system initialization has taken place.

22. The method of claim 21 further comprising the steps of:

F. returning a code which indicates whether or not an error occurred in attempting to allocate and de-allocate the system resources.

23. A computer program product for providing hot swapping capability in a computer system having a static peripheral device driver stored in a memory of the computer system, the static peripheral device driver for managing system resources associated with the peripheral device, the static peripheral device driver having a common portion and a device specific portion, wherein the common portion of the static peripheral device driver is normally operative to identify peripheral devices coupled to the computer system only during system initialization, the computer program product comprising:

first computer readable program code means for monitoring each of a plurality of adapter slots and for detecting when a peripheral device has been connected to one of the plurality of adapter slots and for detecting when the peripheral device has been disconnected from one of the plurality of adapter slots;

second computer readable program code means cooperating with the first computer readable program code means, the second computer readable program code means for generating a first inter-device communications data packet when a peripheral device has been connected to the adapter slot and for generating a second inter-device communications data packet when a peripheral device has been disconnected from, the adapter slot;

third computer readable program code means for sending for sending the first and second inter-device communications data packets to the common portion of the static peripheral device driver wherein;

in response to the first inter-device communications data packet, the common portion of the static peripheral device driver installs system resources user system initialization has taken place; and

in response to the second inter-device communications data packet, the common portion of the static peripheral device driver releases system resources after system initialization has taken place.

24. A computer program product according to claim 23 further comprising:

a computer readable program code means responsive to the allocation and release of system resources for building a return internal data packet having data indicating whether the allocation and release of the system resources was successful; and

a computer readable program code means for sending the return internal data packet from the static peripheral device driver to the first computer readable program code means.

25. A computer program product according to claim 23 wherein a peripheral device having a configuration memory is connected to the computer system through a peripheral device adapter slot and wherein the first computer readable program code comprises:

a computer readable program code means for generating an identification code identifying the peripheral adapter slot;

fourth computer readable computer code means responsive to the identification code for interrogating the configuration memory and retrieving configuration information; and

fifth computer readable computer code means responsive to the retrieved configuration information for selecting a device-specific driver for the peripheral device.