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#ifndef _NX_BITOPS_H
#define _NX_BITOPS_H
/*
* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
/**
* @file
*
* NetXen bit operations
*
*/
/** Datatype used to represent a bit in the pseudo-structures */
typedef unsigned char pseudo_bit_t;
/**
* Wrapper structure for pseudo_bit_t structures
*
* This structure provides a wrapper around pseudo_bit_t structures.
* It has the correct size, and also encapsulates type information
* about the underlying pseudo_bit_t-based structure, which allows the
* NX_FILL etc. macros to work without requiring explicit type
* information.
*/
#define NX_PSEUDO_BIT_STRUCT( _structure ) \
union { \
uint8_t bytes[ sizeof ( _structure ) / 8 ]; \
uint64_t qwords[ sizeof ( _structure ) / 64 ]; \
_structure *dummy[0]; \
} u;
/** Get pseudo_bit_t structure type from wrapper structure pointer */
#define NX_PSEUDO_STRUCT( _ptr ) \
typeof ( *((_ptr)->u.dummy[0]) )
/** Bit offset of a field within a pseudo_bit_t structure */
#define NX_BIT_OFFSET( _ptr, _field ) \
offsetof ( NX_PSEUDO_STRUCT ( _ptr ), _field )
/** Bit width of a field within a pseudo_bit_t structure */
#define NX_BIT_WIDTH( _ptr, _field ) \
sizeof ( ( ( NX_PSEUDO_STRUCT ( _ptr ) * ) NULL )->_field )
/** Qword offset of a field within a pseudo_bit_t structure */
#define NX_QWORD_OFFSET( _ptr, _field ) \
( NX_BIT_OFFSET ( _ptr, _field ) / 64 )
/** Qword bit offset of a field within a pseudo_bit_t structure
*
* Yes, using mod-64 would work, but would lose the check for the
* error of specifying a mismatched field name and qword index.
*/
#define NX_QWORD_BIT_OFFSET( _ptr, _index, _field ) \
( NX_BIT_OFFSET ( _ptr, _field ) - ( 64 * (_index) ) )
/** Bit mask for a field within a pseudo_bit_t structure */
#define NX_BIT_MASK( _ptr, _field ) \
( ( ~( ( uint64_t ) 0 ) ) >> \
( 64 - NX_BIT_WIDTH ( _ptr, _field ) ) )
/*
* Assemble native-endian qword from named fields and values
*
*/
#define NX_ASSEMBLE_1( _ptr, _index, _field, _value ) \
( ( ( uint64_t) (_value) ) << \
NX_QWORD_BIT_OFFSET ( _ptr, _index, _field ) )
#define NX_ASSEMBLE_2( _ptr, _index, _field, _value, ... ) \
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \
NX_ASSEMBLE_1 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_ASSEMBLE_3( _ptr, _index, _field, _value, ... ) \
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \
NX_ASSEMBLE_2 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_ASSEMBLE_4( _ptr, _index, _field, _value, ... ) \
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \
NX_ASSEMBLE_3 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_ASSEMBLE_5( _ptr, _index, _field, _value, ... ) \
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \
NX_ASSEMBLE_4 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_ASSEMBLE_6( _ptr, _index, _field, _value, ... ) \
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \
NX_ASSEMBLE_5 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_ASSEMBLE_7( _ptr, _index, _field, _value, ... ) \
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \
NX_ASSEMBLE_6 ( _ptr, _index, __VA_ARGS__ ) )
/*
* Build native-endian (positive) qword bitmasks from named fields
*
*/
#define NX_MASK_1( _ptr, _index, _field ) \
( NX_BIT_MASK ( _ptr, _field ) << \
NX_QWORD_BIT_OFFSET ( _ptr, _index, _field ) )
#define NX_MASK_2( _ptr, _index, _field, ... ) \
( NX_MASK_1 ( _ptr, _index, _field ) | \
NX_MASK_1 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_MASK_3( _ptr, _index, _field, ... ) \
( NX_MASK_1 ( _ptr, _index, _field ) | \
NX_MASK_2 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_MASK_4( _ptr, _index, _field, ... ) \
( NX_MASK_1 ( _ptr, _index, _field ) | \
NX_MASK_3 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_MASK_5( _ptr, _index, _field, ... ) \
( NX_MASK_1 ( _ptr, _index, _field ) | \
NX_MASK_4 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_MASK_6( _ptr, _index, _field, ... ) \
( NX_MASK_1 ( _ptr, _index, _field ) | \
NX_MASK_5 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_MASK_7( _ptr, _index, _field, ... ) \
( NX_MASK_1 ( _ptr, _index, _field ) | \
NX_MASK_6 ( _ptr, _index, __VA_ARGS__ ) )
/*
* Populate big-endian qwords from named fields and values
*
*/
#define NX_FILL( _ptr, _index, _assembled ) \
do { \
uint64_t *__ptr = &(_ptr)->u.qwords[(_index)]; \
uint64_t __assembled = (_assembled); \
*__ptr = cpu_to_le64 ( __assembled ); \
} while ( 0 )
#define NX_FILL_1( _ptr, _index, ... ) \
NX_FILL ( _ptr, _index, NX_ASSEMBLE_1 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_FILL_2( _ptr, _index, ... ) \
NX_FILL ( _ptr, _index, NX_ASSEMBLE_2 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_FILL_3( _ptr, _index, ... ) \
NX_FILL ( _ptr, _index, NX_ASSEMBLE_3 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_FILL_4( _ptr, _index, ... ) \
NX_FILL ( _ptr, _index, NX_ASSEMBLE_4 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_FILL_5( _ptr, _index, ... ) \
NX_FILL ( _ptr, _index, NX_ASSEMBLE_5 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_FILL_6( _ptr, _index, ... ) \
NX_FILL ( _ptr, _index, NX_ASSEMBLE_6 ( _ptr, _index, __VA_ARGS__ ) )
#define NX_FILL_7( _ptr, _index, ... ) \
NX_FILL ( _ptr, _index, NX_ASSEMBLE_7 ( _ptr, _index, __VA_ARGS__ ) )
/** Extract value of named field */
#define NX_GET64( _ptr, _field ) \
( { \
unsigned int __index = NX_QWORD_OFFSET ( _ptr, _field ); \
uint64_t *__ptr = &(_ptr)->u.qwords[__index]; \
uint64_t __value = le64_to_cpu ( *__ptr ); \
__value >>= \
NX_QWORD_BIT_OFFSET ( _ptr, __index, _field ); \
__value &= NX_BIT_MASK ( _ptr, _field ); \
__value; \
} )
/** Extract value of named field (for fields up to the size of a long) */
#define NX_GET( _ptr, _field ) \
( ( unsigned long ) NX_GET64 ( _ptr, _field ) )
#endif /* _NX_BITOPS_H */
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