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Diffstat (limited to 'contrib/syslinux-4.02/gpxe/src/drivers/net/phantom/nx_bitops.h')
| -rw-r--r-- | contrib/syslinux-4.02/gpxe/src/drivers/net/phantom/nx_bitops.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/drivers/net/phantom/nx_bitops.h b/contrib/syslinux-4.02/gpxe/src/drivers/net/phantom/nx_bitops.h new file mode 100644 index 0000000..4068632 --- /dev/null +++ b/contrib/syslinux-4.02/gpxe/src/drivers/net/phantom/nx_bitops.h @@ -0,0 +1,194 @@ +#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 */ |