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File Content: `bitfield.h`

/*
 *	FILE    	bitfield.h
 *
 *	Version 	1.1
 *	Author  	Copyright (c) Marc A. Viredaz, 1998
 *	        	DEC Western Research Laboratory, Palo Alto, CA
 *	Date    	April 1998 (April 1997)
 *	System  	Advanced RISC Machine (ARM)
 *	Language	C or ARM Assembly
 *	Purpose 	Definition of macros to operate on bit fields.
 */



#ifndef __BITFIELD_H
#define __BITFIELD_H

#ifndef __ASSEMBLY__
#define UData(Data)	((unsigned long) (Data))
#else
#define UData(Data)	(Data)
#endif


/*
 * MACRO: Fld
 *
 * Purpose
 *    The macro "Fld" encodes a bit field, given its size and its shift value
 *    with respect to bit 0.
 *
 * Note
 *    A more intuitive way to encode bit fields would have been to use their
 *    mask. However, extracting size and shift value information from a bit
 *    field's mask is cumbersome and might break the assembler (255-character
 *    line-size limit).
 *
 * Input
 *    Size      	Size of the bit field, in number of bits.
 *    Shft      	Shift value of the bit field with respect to bit 0.
 *
 * Output
 *    Fld       	Encoded bit field.
 */

#define Fld(Size, Shft)	(((Size) << 16) + (Shft))


/*
 * MACROS: FSize, FShft, FMsk, FAlnMsk, F1stBit
 *
 * Purpose
 *    The macros "FSize", "FShft", "FMsk", "FAlnMsk", and "F1stBit" return
 *    the size, shift value, mask, aligned mask, and first bit of a
 *    bit field.
 *
 * Input
 *    Field     	Encoded bit field (using the macro "Fld").
 *
 * Output
 *    FSize     	Size of the bit field, in number of bits.
 *    FShft     	Shift value of the bit field with respect to bit 0.
 *    FMsk      	Mask for the bit field.
 *    FAlnMsk   	Mask for the bit field, aligned on bit 0.
 *    F1stBit   	First bit of the bit field.
 */

#define FSize(Field)	((Field) >> 16)
#define FShft(Field)	((Field) & 0x0000FFFF)
#define FMsk(Field)	(((UData (1) << FSize (Field)) - 1) << FShft (Field))
#define FAlnMsk(Field)	((UData (1) << FSize (Field)) - 1)
#define F1stBit(Field)	(UData (1) << FShft (Field))


/*
 * MACRO: FInsrt
 *
 * Purpose
 *    The macro "FInsrt" inserts a value into a bit field by shifting the
 *    former appropriately.
 *
 * Input
 *    Value     	Bit-field value.
 *    Field     	Encoded bit field (using the macro "Fld").
 *
 * Output
 *    FInsrt    	Bit-field value positioned appropriately.
 */

#define FInsrt(Value, Field) \
                	(UData (Value) << FShft (Field))


/*
 * MACRO: FExtr
 *
 * Purpose
 *    The macro "FExtr" extracts the value of a bit field by masking and
 *    shifting it appropriately.
 *
 * Input
 *    Data      	Data containing the bit-field to be extracted.
 *    Field     	Encoded bit field (using the macro "Fld").
 *
 * Output
 *    FExtr     	Bit-field value.
 */

#define FExtr(Data, Field) \
                	((UData (Data) >> FShft (Field)) & FAlnMsk (Field))


#endif /* __BITFIELD_H */

Name	Size	Permission
SA-1100.h	97933 bytes	0644
assabet.h	4172 bytes	0644
badge4.h	2381 bytes	0644
bitfield.h	2835 bytes	0644
cerf.h	438 bytes	0644
collie.h	3472 bytes	0644
generic.h	27 bytes	0644
h3xxx.h	3369 bytes	0644
hardware.h	1388 bytes	0644
irqs.h	3143 bytes	0644
jornada720.h	810 bytes	0644
memory.h	1061 bytes	0644
mtd-xip.h	669 bytes	0644
nanoengine.h	1633 bytes	0644
neponset.h	834 bytes	0644
reset.h	534 bytes	0644
shannon.h	1912 bytes	0644
simpad.h	5662 bytes	0644
uncompress.h	1115 bytes	0644

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File Content: bitfield.h

File Content: `bitfield.h`