--- /dev/null
+#ifndef _MLX_BITOPS_H
+#define _MLX_BITOPS_H
+
+/*
+ * Copyright (C) 2007 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/**
+ * @file
+ *
+ * Mellanox bit operations
+ *
+ */
+
+/* Datatype used to represent a bit in the Mellanox autogenerated headers */
+typedef unsigned char pseudo_bit_t;
+
+/**
+ * Wrapper structure for pseudo_bit_t structures
+ *
+ * This structure provides a wrapper around the autogenerated
+ * pseudo_bit_t structures. It has the correct size, and also
+ * encapsulates type information about the underlying pseudo_bit_t
+ * structure, which allows the MLX_FILL etc. macros to work without
+ * requiring explicit type information.
+ */
+#define MLX_DECLARE_STRUCT( _structure ) \
+ _structure { \
+ union { \
+ uint8_t bytes[ sizeof ( struct _structure ## _st ) / 8 ]; \
+ uint32_t dwords[ sizeof ( struct _structure ## _st ) / 32 ]; \
+ struct _structure ## _st *dummy[0]; \
+ } __attribute__ (( packed )) u; \
+ } __attribute__ (( packed ))
+
+/** Get pseudo_bit_t structure type from wrapper structure pointer */
+#define MLX_PSEUDO_STRUCT( _ptr ) \
+ typeof ( *((_ptr)->u.dummy[0]) )
+
+/** Bit offset of a field within a pseudo_bit_t structure */
+#define MLX_BIT_OFFSET( _structure_st, _field ) \
+ offsetof ( _structure_st, _field )
+
+/** Dword offset of a field within a pseudo_bit_t structure */
+#define MLX_DWORD_OFFSET( _structure_st, _field ) \
+ ( MLX_BIT_OFFSET ( _structure_st, _field ) / 32 )
+
+/** Dword bit offset of a field within a pseudo_bit_t structure
+ *
+ * Yes, using mod-32 would work, but would lose the check for the
+ * error of specifying a mismatched field name and dword index.
+ */
+#define MLX_DWORD_BIT_OFFSET( _structure_st, _index, _field ) \
+ ( MLX_BIT_OFFSET ( _structure_st, _field ) - ( 32 * (_index) ) )
+
+/** Bit width of a field within a pseudo_bit_t structure */
+#define MLX_BIT_WIDTH( _structure_st, _field ) \
+ sizeof ( ( ( _structure_st * ) NULL )->_field )
+
+/** Bit mask for a field within a pseudo_bit_t structure */
+#define MLX_BIT_MASK( _structure_st, _field ) \
+ ( ( ~( ( uint32_t ) 0 ) ) >> \
+ ( 32 - MLX_BIT_WIDTH ( _structure_st, _field ) ) )
+
+/*
+ * Assemble native-endian dword from named fields and values
+ *
+ */
+
+#define MLX_ASSEMBLE_1( _structure_st, _index, _field, _value ) \
+ ( (_value) << MLX_DWORD_BIT_OFFSET ( _structure_st, _index, _field ) )
+
+#define MLX_ASSEMBLE_2( _structure_st, _index, _field, _value, ... ) \
+ ( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
+ MLX_ASSEMBLE_1 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_ASSEMBLE_3( _structure_st, _index, _field, _value, ... ) \
+ ( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
+ MLX_ASSEMBLE_2 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_ASSEMBLE_4( _structure_st, _index, _field, _value, ... ) \
+ ( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
+ MLX_ASSEMBLE_3 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_ASSEMBLE_5( _structure_st, _index, _field, _value, ... ) \
+ ( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
+ MLX_ASSEMBLE_4 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_ASSEMBLE_6( _structure_st, _index, _field, _value, ... ) \
+ ( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
+ MLX_ASSEMBLE_5 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_ASSEMBLE_7( _structure_st, _index, _field, _value, ... ) \
+ ( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
+ MLX_ASSEMBLE_6 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_ASSEMBLE_8( _structure_st, _index, _field, _value, ... ) \
+ ( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
+ MLX_ASSEMBLE_7 ( _structure_st, _index, __VA_ARGS__ ) )
+
+/*
+ * Build native-endian (positive) dword bitmasks from named fields
+ *
+ */
+
+#define MLX_MASK_1( _structure_st, _index, _field ) \
+ ( MLX_BIT_MASK ( _structure_st, _field ) << \
+ MLX_DWORD_BIT_OFFSET ( _structure_st, _index, _field ) )
+
+#define MLX_MASK_2( _structure_st, _index, _field, ... ) \
+ ( MLX_MASK_1 ( _structure_st, _index, _field ) | \
+ MLX_MASK_1 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_MASK_3( _structure_st, _index, _field, ... ) \
+ ( MLX_MASK_1 ( _structure_st, _index, _field ) | \
+ MLX_MASK_2 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_MASK_4( _structure_st, _index, _field, ... ) \
+ ( MLX_MASK_1 ( _structure_st, _index, _field ) | \
+ MLX_MASK_3 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_MASK_5( _structure_st, _index, _field, ... ) \
+ ( MLX_MASK_1 ( _structure_st, _index, _field ) | \
+ MLX_MASK_4 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_MASK_6( _structure_st, _index, _field, ... ) \
+ ( MLX_MASK_1 ( _structure_st, _index, _field ) | \
+ MLX_MASK_5 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_MASK_7( _structure_st, _index, _field, ... ) \
+ ( MLX_MASK_1 ( _structure_st, _index, _field ) | \
+ MLX_MASK_6 ( _structure_st, _index, __VA_ARGS__ ) )
+
+#define MLX_MASK_8( _structure_st, _index, _field, ... ) \
+ ( MLX_MASK_1 ( _structure_st, _index, _field ) | \
+ MLX_MASK_7 ( _structure_st, _index, __VA_ARGS__ ) )
+
+/*
+ * Populate big-endian dwords from named fields and values
+ *
+ */
+
+#define MLX_FILL( _ptr, _index, _assembled ) \
+ do { \
+ uint32_t *__ptr = &(_ptr)->u.dwords[(_index)]; \
+ uint32_t __assembled = (_assembled); \
+ *__ptr = cpu_to_be32 ( __assembled ); \
+ } while ( 0 )
+
+#define MLX_FILL_1( _ptr, _index, ... ) \
+ MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_1 ( MLX_PSEUDO_STRUCT ( _ptr ),\
+ _index, __VA_ARGS__ ) )
+
+#define MLX_FILL_2( _ptr, _index, ... ) \
+ MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_2 ( MLX_PSEUDO_STRUCT ( _ptr ),\
+ _index, __VA_ARGS__ ) )
+
+#define MLX_FILL_3( _ptr, _index, ... ) \
+ MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_3 ( MLX_PSEUDO_STRUCT ( _ptr ),\
+ _index, __VA_ARGS__ ) )
+
+#define MLX_FILL_4( _ptr, _index, ... ) \
+ MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_4 ( MLX_PSEUDO_STRUCT ( _ptr ),\
+ _index, __VA_ARGS__ ) )
+
+#define MLX_FILL_5( _ptr, _index, ... ) \
+ MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_5 ( MLX_PSEUDO_STRUCT ( _ptr ),\
+ _index, __VA_ARGS__ ) )
+
+#define MLX_FILL_6( _ptr, _index, ... ) \
+ MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_6 ( MLX_PSEUDO_STRUCT ( _ptr ),\
+ _index, __VA_ARGS__ ) )
+
+#define MLX_FILL_7( _ptr, _index, ... ) \
+ MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_7 ( MLX_PSEUDO_STRUCT ( _ptr ),\
+ _index, __VA_ARGS__ ) )
+
+#define MLX_FILL_8( _ptr, _index, ... ) \
+ MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_8 ( MLX_PSEUDO_STRUCT ( _ptr ),\
+ _index, __VA_ARGS__ ) )
+
+/*
+ * Modify big-endian dword using named field and value
+ *
+ */
+
+#define MLX_SET( _ptr, _field, _value ) \
+ do { \
+ unsigned int __index = \
+ MLX_DWORD_OFFSET ( MLX_PSEUDO_STRUCT ( _ptr ), _field ); \
+ uint32_t *__ptr = &(_ptr)->u.dwords[__index]; \
+ uint32_t __value = be32_to_cpu ( *__ptr ); \
+ __value &= ~( MLX_MASK_1 ( MLX_PSEUDO_STRUCT ( _ptr ), \
+ __index, _field ) ); \
+ __value |= MLX_ASSEMBLE_1 ( MLX_PSEUDO_STRUCT ( _ptr ), \
+ __index, _field, _value ); \
+ *__ptr = cpu_to_be32 ( __value ); \
+ } while ( 0 )
+
+/*
+ * Extract value of named field
+ *
+ */
+
+#define MLX_GET( _ptr, _field ) \
+ ( { \
+ unsigned int __index = \
+ MLX_DWORD_OFFSET ( MLX_PSEUDO_STRUCT ( _ptr ), _field ); \
+ uint32_t *__ptr = &(_ptr)->u.dwords[__index]; \
+ uint32_t __value = be32_to_cpu ( *__ptr ); \
+ __value >>= \
+ MLX_DWORD_BIT_OFFSET ( MLX_PSEUDO_STRUCT ( _ptr ), \
+ __index, _field ); \
+ __value &= \
+ MLX_BIT_MASK ( MLX_PSEUDO_STRUCT ( _ptr ), _field ); \
+ __value; \
+ } )
+
+/*
+ * Fill high dword of physical address, if necessary
+ *
+ */
+#define MLX_FILL_H( _structure_st, _index, _field, _address ) do { \
+ if ( sizeof ( physaddr_t ) > sizeof ( uint32_t ) ) { \
+ MLX_FILL_1 ( _structure_st, _index, _field, \
+ ( ( ( uint64_t ) (_address) ) >> 32 ) ); \
+ } } while ( 0 )
+
+#endif /* _MLX_BITOPS_H */
Code Review / kvmfornfv.git / blobdiff