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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#ifndef CDX_BITFIELD_H#define CDX_BITFIELD_H
#include <linux/bitfield.h>
/* Lowest bit numbers and widths */#define CDX_DWORD_LBN 0#define CDX_DWORD_WIDTH 32
/* Specified attribute (e.g. LBN) of the specified field */#define CDX_VAL(field, attribute) field ## _ ## attribute/* Low bit number of the specified field */#define CDX_LOW_BIT(field) CDX_VAL(field, LBN)/* Bit width of the specified field */#define CDX_WIDTH(field) CDX_VAL(field, WIDTH)/* High bit number of the specified field */#define CDX_HIGH_BIT(field) (CDX_LOW_BIT(field) + CDX_WIDTH(field) - 1)
/* A doubleword (i.e. 4 byte) datatype - little-endian in HW */struct cdx_dword { __le32 cdx_u32;};
/* Value expanders for printk */#define CDX_DWORD_VAL(dword) \ ((unsigned int)le32_to_cpu((dword).cdx_u32))
/* * Extract bit field portion [low,high) from the 32-bit little-endian * element which contains bits [min,max) */#define CDX_DWORD_FIELD(dword, field) \ (FIELD_GET(GENMASK(CDX_HIGH_BIT(field), CDX_LOW_BIT(field)), \ le32_to_cpu((dword).cdx_u32)))
/* * Creates the portion of the named bit field that lies within the * range [min,max). */#define CDX_INSERT_FIELD(field, value) \ (FIELD_PREP(GENMASK(CDX_HIGH_BIT(field), \ CDX_LOW_BIT(field)), value))
/* * Creates the portion of the named bit fields that lie within the * range [min,max). */#define CDX_INSERT_FIELDS(field1, value1, \ field2, value2, \ field3, value3, \ field4, value4, \ field5, value5, \ field6, value6, \ field7, value7) \ (CDX_INSERT_FIELD(field1, (value1)) | \ CDX_INSERT_FIELD(field2, (value2)) | \ CDX_INSERT_FIELD(field3, (value3)) | \ CDX_INSERT_FIELD(field4, (value4)) | \ CDX_INSERT_FIELD(field5, (value5)) | \ CDX_INSERT_FIELD(field6, (value6)) | \ CDX_INSERT_FIELD(field7, (value7)))
#define CDX_POPULATE_DWORD(dword, ...) \ (dword).cdx_u32 = cpu_to_le32(CDX_INSERT_FIELDS(__VA_ARGS__))
/* Populate a dword field with various numbers of arguments */#define CDX_POPULATE_DWORD_7 CDX_POPULATE_DWORD#define CDX_POPULATE_DWORD_6(dword, ...) \ CDX_POPULATE_DWORD_7(dword, CDX_DWORD, 0, __VA_ARGS__)#define CDX_POPULATE_DWORD_5(dword, ...) \ CDX_POPULATE_DWORD_6(dword, CDX_DWORD, 0, __VA_ARGS__)#define CDX_POPULATE_DWORD_4(dword, ...) \ CDX_POPULATE_DWORD_5(dword, CDX_DWORD, 0, __VA_ARGS__)#define CDX_POPULATE_DWORD_3(dword, ...) \ CDX_POPULATE_DWORD_4(dword, CDX_DWORD, 0, __VA_ARGS__)#define CDX_POPULATE_DWORD_2(dword, ...) \ CDX_POPULATE_DWORD_3(dword, CDX_DWORD, 0, __VA_ARGS__)#define CDX_POPULATE_DWORD_1(dword, ...) \ CDX_POPULATE_DWORD_2(dword, CDX_DWORD, 0, __VA_ARGS__)#define CDX_SET_DWORD(dword) \ CDX_POPULATE_DWORD_1(dword, CDX_DWORD, 0xffffffff)
#endif /* CDX_BITFIELD_H */