| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> |
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| 4 | * Bugreports.to..: <Linux390@de.ibm.com> |
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| 5 | * Copyright IBM Corp. 1999, 2000 |
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| 6 | * |
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| 7 | */ |
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| 8 | |
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| 9 | #ifndef DASD_FBA_H |
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| 10 | #define DASD_FBA_H |
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| 11 | |
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| 12 | /* |
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| 13 | * Maximum number of blocks to be chained |
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| 14 | */ |
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| 15 | #define DASD_FBA_MAX_BLOCKS 96 |
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| 16 | |
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| 17 | struct DE_fba_data { |
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| 18 | struct { |
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| 19 | unsigned char perm:2; /* Permissions on this extent */ |
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| 20 | unsigned char zero:2; /* Must be zero */ |
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| 21 | unsigned char da:1; /* usually zero */ |
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| 22 | unsigned char diag:1; /* allow diagnose */ |
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| 23 | unsigned char zero2:2; /* zero */ |
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| 24 | } __attribute__ ((packed)) mask; |
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| 25 | __u8 zero; /* Must be zero */ |
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| 26 | __u16 blk_size; /* Blocksize */ |
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| 27 | __u32 ext_loc; /* Extent locator */ |
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| 28 | __u32 ext_beg; /* logical number of block 0 in extent */ |
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| 29 | __u32 ext_end; /* logocal number of last block in extent */ |
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| 30 | } __attribute__ ((packed)); |
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| 31 | |
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| 32 | struct LO_fba_data { |
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| 33 | struct { |
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| 34 | unsigned char zero:4; |
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| 35 | unsigned char cmd:4; |
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| 36 | } __attribute__ ((packed)) operation; |
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| 37 | __u8 auxiliary; |
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| 38 | __u16 blk_ct; |
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| 39 | __u32 blk_nr; |
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| 40 | } __attribute__ ((packed)); |
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| 41 | |
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| 42 | struct dasd_fba_characteristics { |
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| 43 | union { |
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| 44 | __u8 c; |
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| 45 | struct { |
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| 46 | unsigned char reserved:1; |
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| 47 | unsigned char overrunnable:1; |
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| 48 | unsigned char burst_byte:1; |
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| 49 | unsigned char data_chain:1; |
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| 50 | unsigned char zeros:4; |
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| 51 | } __attribute__ ((packed)) bits; |
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| 52 | } __attribute__ ((packed)) mode; |
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| 53 | union { |
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| 54 | __u8 c; |
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| 55 | struct { |
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| 56 | unsigned char zero0:1; |
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| 57 | unsigned char removable:1; |
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| 58 | unsigned char shared:1; |
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| 59 | unsigned char zero1:1; |
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| 60 | unsigned char mam:1; |
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| 61 | unsigned char zeros:3; |
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| 62 | } __attribute__ ((packed)) bits; |
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| 63 | } __attribute__ ((packed)) features; |
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| 64 | __u8 dev_class; |
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| 65 | __u8 unit_type; |
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| 66 | __u16 blk_size; |
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| 67 | __u32 blk_per_cycl; |
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| 68 | __u32 blk_per_bound; |
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| 69 | __u32 blk_bdsa; |
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| 70 | __u32 reserved0; |
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| 71 | __u16 reserved1; |
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| 72 | __u16 blk_ce; |
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| 73 | __u32 reserved2; |
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| 74 | __u16 reserved3; |
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| 75 | } __attribute__ ((packed)); |
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| 76 | |
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| 77 | #endif /* DASD_FBA_H */ |
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| 78 | |
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