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[linux-2.6.9-moxart.git] / include / asm-s390 / tape390.h
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1 /*************************************************************************
3 * tape390.h
4 * enables user programs to display messages on the tape device
6 * S390 and zSeries version
7 * Copyright (C) 2001 IBM Corporation
8 * Author(s): Despina Papadopoulou <despina_p@de.ibm.com>
10 *************************************************************************/
12 #ifndef _TAPE390_H
13 #define _TAPE390_H
15 #define TAPE390_DISPLAY _IOW('d', 1, struct display_struct)
18 * The TAPE390_DISPLAY ioctl calls the Load Display command
19 * which transfers 17 bytes of data from the channel to the subsystem:
20 * - 1 format control byte, and
21 * - two 8-byte messages
23 * Format control byte:
24 * 0-2: New Message Overlay
25 * 3: Alternate Messages
26 * 4: Blink Message
27 * 5: Display Low/High Message
28 * 6: Reserved
29 * 7: Automatic Load Request
33 typedef struct display_struct {
34 char cntrl;
35 char message1[8];
36 char message2[8];
37 } display_struct;
39 #endif