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/*  This file is part of the program psim.

    Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>

    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

    (at your option) 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

    */

#ifndef _BITS_H_

#define _BITS_H_

/* bit manipulation routines:

   Bit numbering: The bits are numbered according to the PowerPC

   convention - the left most (or most significant) is bit 0 while the

   right most (least significant) is bit 1.

   Size convention: Each macro is in three forms - <MACRO>32 which

   operates in 32bit quantity (bits are numbered 0..31); <MACRO>64

   which operates using 64bit quantites (and bits are numbered 0..64);

   and <MACRO> which operates using the bit size of the target

   architecture (bits are still numbered 0..63), with 32bit

   architectures ignoring the first 32bits having bit 32 as the most

   significant.

   BIT*(POS): Quantity with just 1 bit set.

   MASK*(FIRST, LAST): Create a constant bit mask of the specified

   size with bits [FIRST .. LAST] set.

   MASKED*(VALUE, FIRST, LAST): Masks out all but bits [FIRST

   .. LAST].

   EXTRACTED*(VALUE, FIRST, LAST): Masks out bits [FIRST .. LAST] but

   also right shifts the masked value so that bit LAST becomes the

   least significant (right most).

   SHUFFLED**(VALUE, OLD, NEW): Mask then move a single bit from OLD

   new NEW.

   MOVED**(VALUE, OLD_FIRST, OLD_LAST, NEW_FIRST, NEW_LAST): Moves

   things around so that bits OLD_FIRST..OLD_LAST are masked then

   moved to NEW_FIRST..NEW_LAST.

   INSERTED*(VALUE, FIRST, LAST): Takes VALUE and `inserts' the (LAST

   - FIRST + 1) least significant bits into bit positions [ FIRST

   .. LAST ].  This is almost the complement to EXTRACTED.

   IEA_MASKED(SHOULD_MASK, ADDR): Convert the address to the targets

   natural size.  If in 32bit mode, discard the high 32bits.

   EXTENDED(VALUE): Convert VALUE (32bits of it) to the targets

   natural size.  If in 64bit mode, sign extend the value.

   ALIGN_*(VALUE): Round upwards the value so that it is aligned.

   FLOOR_*(VALUE): Truncate the value so that it is aligned.

   ROTL*(VALUE, NR_BITS): Return the value rotated by NR_BITS

   */

#define _MAKE_SHIFT(WIDTH, pos) ((WIDTH) - 1 - (pos))

/* MakeBit */

#define _BITn(WIDTH, pos) (((natural##WIDTH)(1)) \

                           << _MAKE_SHIFT(WIDTH, pos))

#define BIT4(POS)  (1 << _MAKE_SHIFT(4, POS))

#define BIT5(POS)  (1 << _MAKE_SHIFT(5, POS))

#define BIT8(POS)  (1 << _MAKE_SHIFT(8, POS))

#define BIT10(POS)  (1 << _MAKE_SHIFT(10, POS))

#define BIT32(POS) _BITn(32, POS)

#define BIT64(POS) _BITn(64, POS)

#if (WITH_TARGET_WORD_BITSIZE == 64)

#define BIT(POS)   BIT64(POS)

#else

#define BIT(POS)   (((POS) < 32) ? 0 : _BITn(32, (POS)-32))

#endif

/* multi bit mask */

#define _MASKn(WIDTH, START, STOP) \

(((((unsigned##WIDTH)0) - 1) \

  >> (WIDTH - ((STOP) - (START) + 1))) \

 << (WIDTH - 1 - (STOP)))

#define MASK32(START, STOP)   _MASKn(32, START, STOP)

#define MASK64(START, STOP)   _MASKn(64, START, STOP)

#if (WITH_TARGET_WORD_BITSIZE == 64)

#define MASK(START, STOP) \

(((START) <= (STOP)) \

 ? _MASKn(64, START, STOP) \

 : (_MASKn(64, 0, STOP) \

    | _MASKn(64, START, 63)))

#else

#define MASK(START, STOP) \

(((START) <= (STOP)) \

 ? (((STOP) < 32) \

    ? 0 \

    : _MASKn(32, \

             (START) < 32 ? 0 : (START) - 32, \

             (STOP)-32)) \

 : (_MASKn(32, \

           (START) < 32 ? 0 : (START) - 32, \

           31) \

    | (((STOP) < 32) \

       ? 0 \

       : _MASKn(32, \

                0, \

                (STOP) - 32))))

#endif

/* mask the required bits, leaving them in place */

INLINE_BITS\

(unsigned32) MASKED32

(unsigned32 word,

 unsigned start,

 unsigned stop);

INLINE_BITS\

(unsigned64) MASKED64

(unsigned64 word,

 unsigned start,

 unsigned stop);

INLINE_BITS\

(unsigned_word) MASKED

(unsigned_word word,

 unsigned start,

 unsigned stop);

/* extract the required bits aligning them with the lsb */

#define _EXTRACTEDn(WIDTH, WORD, START, STOP) \

((((natural##WIDTH)(WORD)) >> (WIDTH - (STOP) - 1)) \

 & _MASKn(WIDTH, WIDTH-1+(START)-(STOP), WIDTH-1))

/* #define EXTRACTED10(WORD, START, STOP) _EXTRACTEDn(10, WORD, START, STOP) */

#define EXTRACTED32(WORD, START, STOP) _EXTRACTEDn(32, WORD, START, STOP)

#define EXTRACTED64(WORD, START, STOP) _EXTRACTEDn(64, WORD, START, STOP)

INLINE_BITS\

(unsigned_word) EXTRACTED

(unsigned_word val,

 unsigned start,

 unsigned stop);

/* move a single bit around */

/* NB: the wierdness (N>O?N-O:0) is to stop a warning from GCC */

#define _SHUFFLEDn(N, WORD, OLD, NEW) \

((OLD) < (NEW) \

 ? (((unsigned##N)(WORD) \

     >> (((NEW) > (OLD)) ? ((NEW) - (OLD)) : 0)) \

    & MASK32((NEW), (NEW))) \

 : (((unsigned##N)(WORD) \

     << (((OLD) > (NEW)) ? ((OLD) - (NEW)) : 0)) \

    & MASK32((NEW), (NEW))))

#define SHUFFLED32(WORD, OLD, NEW) _SHUFFLEDn(32, WORD, OLD, NEW)

#define SHUFFLED64(WORD, OLD, NEW) _SHUFFLEDn(64, WORD, OLD, NEW)

#define SHUFFLED(WORD, OLD, NEW) _SHUFFLEDn(_word, WORD, OLD, NEW)

/* move a group of bits around */

#define _INSERTEDn(N, WORD, START, STOP) \

(((natural##N)(WORD) << _MAKE_SHIFT(N, STOP)) & _MASKn(N, START, STOP))

#define INSERTED32(WORD, START, STOP) _INSERTEDn(32, WORD, START, STOP)

#define INSERTED64(WORD, START, STOP) _INSERTEDn(64, WORD, START, STOP)

INLINE_BITS\

(unsigned_word) INSERTED

(unsigned_word val,

 unsigned start,

 unsigned stop);

/* depending on MODE return a 64bit or 32bit (sign extended) value */

#if (WITH_TARGET_WORD_BITSIZE == 64)

#define EXTENDED(X)     ((signed64)(signed32)(X))

#else

#define EXTENDED(X)     (X)

#endif

/* memory alignment macro's */

#define _ALIGNa(A,X)  (((X) + ((A) - 1)) & ~((A) - 1))

#define _FLOORa(A,X)  ((X) & ~((A) - 1))

#define ALIGN_8(X)      _ALIGNa(8, X)

#define ALIGN_16(X)     _ALIGNa(16, X)

#define ALIGN_PAGE(X)   _ALIGNa(0x1000, X)

#define FLOOR_PAGE(X)   ((X) & ~(0x1000 - 1))

/* bit bliting macro's */

#define BLIT32(V, POS, BIT) \

do { \

  if (BIT) \

    V |= BIT32(POS); \

  else \

    V &= ~BIT32(POS); \

} while (0)

#define MBLIT32(V, LO, HI, VAL) \

do { \

  (V) = (((V) & ~MASK32((LO), (HI))) \

         | INSERTED32(VAL, LO, HI)); \

} while (0)

/* some rotate functions to make things easier

   NOTE: These are functions not macro's as the latter tickles bugs in

   gcc-2.6.3 */

#define _ROTLn(N, VAL, SHIFT) \

(((VAL) << (SHIFT)) | ((VAL) >> ((N)-(SHIFT))))

INLINE_BITS\

(unsigned32) ROTL32

(unsigned32 val,

 long shift);

INLINE_BITS\

(unsigned64) ROTL64

(unsigned64 val,

 long shift);

#if (BITS_INLINE & INCLUDE_MODULE)

#include "bits.c"

#endif

#endif /* _BITS_H_ */