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64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _VSTRUCTS_H
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#define _VSTRUCTS_H
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#include "util.h"
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/*
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* NOTE: we can't differentiate between __le64 and u64 with type_is - this
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* assumes u64 is little endian:
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*/
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#define __vstruct_u64s(_s) \
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({ \
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( type_is((_s)->u64s, u64) ? le64_to_cpu((__force __le64) (_s)->u64s) \
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: type_is((_s)->u64s, u32) ? le32_to_cpu((__force __le32) (_s)->u64s) \
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: type_is((_s)->u64s, u16) ? le16_to_cpu((__force __le16) (_s)->u64s) \
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: ((__force u8) ((_s)->u64s))); \
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})
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#define __vstruct_bytes(_type, _u64s) \
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({ \
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BUILD_BUG_ON(offsetof(_type, _data) % sizeof(u64)); \
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\
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(size_t) (offsetof(_type, _data) + (_u64s) * sizeof(u64)); \
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})
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#define vstruct_bytes(_s) \
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__vstruct_bytes(typeof(*(_s)), __vstruct_u64s(_s))
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#define __vstruct_blocks(_type, _sector_block_bits, _u64s) \
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(round_up(__vstruct_bytes(_type, _u64s), \
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512 << (_sector_block_bits)) >> (9 + (_sector_block_bits)))
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#define vstruct_blocks(_s, _sector_block_bits) \
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__vstruct_blocks(typeof(*(_s)), _sector_block_bits, __vstruct_u64s(_s))
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#define vstruct_blocks_plus(_s, _sector_block_bits, _u64s) \
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__vstruct_blocks(typeof(*(_s)), _sector_block_bits, \
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__vstruct_u64s(_s) + (_u64s))
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#define vstruct_sectors(_s, _sector_block_bits) \
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(round_up(vstruct_bytes(_s), 512 << (_sector_block_bits)) >> 9)
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#define vstruct_next(_s) \
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((typeof(_s)) ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
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#define vstruct_last(_s) \
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((typeof(&(_s)->start[0])) ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
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#define vstruct_end(_s) \
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((void *) ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
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#define vstruct_for_each(_s, _i) \
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for (typeof(&(_s)->start[0]) _i = (_s)->start; \
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_i < vstruct_last(_s); \
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_i = vstruct_next(_i))
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#define vstruct_for_each_safe(_s, _i) \
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for (typeof(&(_s)->start[0]) _next, _i = (_s)->start; \
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_i < vstruct_last(_s) && (_next = vstruct_next(_i), true); \
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_i = _next)
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#define vstruct_idx(_s, _idx) \
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((typeof(&(_s)->start[0])) ((_s)->_data + (_idx)))
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#endif /* _VSTRUCTS_H */
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