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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Miscellaneous helper API declarations
*
* Copyright (c) 2007 Michael Sevakis
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef MPEG_MISC_H
#define MPEG_MISC_H
/* Miscellaneous helpers */
#ifndef ALIGNED_ATTR
#define ALIGNED_ATTR(x) __attribute__((aligned(x)))
#endif
/* Generic states for when things are too simple to care about naming them */
enum state_enum
{
STATE0 = 0,
STATE1,
STATE2,
STATE3,
STATE4,
STATE5,
STATE6,
STATE7,
STATE8,
STATE9,
};
/* Macros for comparing memory bytes to a series of constant bytes in an
efficient manner - evaluate to true if corresponding bytes match */
#if defined (CPU_ARM)
/* ARM must load 32-bit values at addres % 4 == 0 offsets but this data
isn't aligned nescessarily, so just byte compare */
#define CMP_3_CONST(_a, _b) \
({ int _x; \
asm volatile ( \
"ldrb %[x], [%[a], #0] \n" \
"eors %[x], %[x], %[b0] \n" \
"ldreqb %[x], [%[a], #1] \n" \
"eoreqs %[x], %[x], %[b1] \n" \
"ldreqb %[x], [%[a], #2] \n" \
"eoreqs %[x], %[x], %[b2] \n" \
: [x]"=&r"(_x) \
: [a]"r"(_a), \
[b0]"i"(((_b) >> 24) & 0xff), \
[b1]"i"(((_b) >> 16) & 0xff), \
[b2]"i"(((_b) >> 8) & 0xff) \
); \
_x == 0; })
#define CMP_4_CONST(_a, _b) \
({ int _x; \
asm volatile ( \
"ldrb %[x], [%[a], #0] \n" \
"eors %[x], %[x], %[b0] \n" \
"ldreqb %[x], [%[a], #1] \n" \
"eoreqs %[x], %[x], %[b1] \n" \
"ldreqb %[x], [%[a], #2] \n" \
"eoreqs %[x], %[x], %[b2] \n" \
"ldreqb %[x], [%[a], #3] \n" \
"eoreqs %[x], %[x], %[b3] \n" \
: [x]"=&r"(_x) \
: [a]"r"(_a), \
[b0]"i"(((_b) >> 24) & 0xff), \
[b1]"i"(((_b) >> 16) & 0xff), \
[b2]"i"(((_b) >> 8) & 0xff), \
[b3]"i"(((_b) ) & 0xff) \
); \
_x == 0; })
#elif defined (CPU_COLDFIRE)
/* Coldfire can just load a 32 bit value at any offset but ASM is not the
best way to integrate this with the C code */
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