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dsp.h

/*
 * Copyright (C) 2005 Mips Technologies
 * Author: Chris Dearman, chris@mips.com derived from fpu.h
 *
 * 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.
 */
#ifndef _ASM_DSP_H
#define _ASM_DSP_H

#include <asm/cpu.h>
#include <asm/cpu-features.h>
#include <asm/hazards.h>
#include <asm/mipsregs.h>

#define DSP_DEFAULT     0x00000000
#define DSP_MASK  0x3ff

#define __enable_dsp_hazard()                               \
do {                                                  \
      asm("_ehb");                                          \
} while (0)

static inline void __init_dsp(void)
{
      mthi1(0);
      mtlo1(0);
      mthi2(0);
      mtlo2(0);
      mthi3(0);
      mtlo3(0);
      wrdsp(DSP_DEFAULT, DSP_MASK);
}

static inline void init_dsp(void)
{
      if (cpu_has_dsp)
            __init_dsp();
}

#define __save_dsp(tsk)                                     \
do {                                                  \
      tsk->thread.dsp.dspr[0] = mfhi1();                    \
      tsk->thread.dsp.dspr[1] = mflo1();                    \
      tsk->thread.dsp.dspr[2] = mfhi2();                    \
      tsk->thread.dsp.dspr[3] = mflo2();                    \
      tsk->thread.dsp.dspr[4] = mfhi3();                    \
      tsk->thread.dsp.dspr[5] = mflo3();                    \
      tsk->thread.dsp.dspcontrol = rddsp(DSP_MASK);               \
} while (0)

#define save_dsp(tsk)                                       \
do {                                                  \
      if (cpu_has_dsp)                                \
            __save_dsp(tsk);                          \
} while (0)

#define __restore_dsp(tsk)                                  \
do {                                                  \
      mthi1(tsk->thread.dsp.dspr[0]);                             \
      mtlo1(tsk->thread.dsp.dspr[1]);                             \
      mthi2(tsk->thread.dsp.dspr[2]);                             \
      mtlo2(tsk->thread.dsp.dspr[3]);                             \
      mthi3(tsk->thread.dsp.dspr[4]);                             \
      mtlo3(tsk->thread.dsp.dspr[5]);                             \
      wrdsp(tsk->thread.dsp.dspcontrol, DSP_MASK);                \
} while (0)

#define restore_dsp(tsk)                                    \
do {                                                  \
      if (cpu_has_dsp)                                \
            __restore_dsp(tsk);                             \
} while (0)

#define __get_dsp_regs(tsk)                                 \
({                                                    \
      if (tsk == current)                                   \
            __save_dsp(current);                            \
                                                      \
      tsk->thread.dsp.dspr;                                 \
})

#endif /* _ASM_DSP_H */

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