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/*==========================================================================

//

//      hal_misc.c

//

//      HAL miscellaneous functions

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos 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 or (at your option) any later version.

//

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// 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 eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

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// in accordance with section (3) of the GNU General Public License.

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// this file might be covered by the GNU General Public License.

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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    nickg

// Contributors: nickg, jlarmour

// Date:         1999-02-18

// Purpose:      HAL miscellaneous functions

// Description:  This file contains miscellaneous functions provided by the

//               HAL.

//

//####DESCRIPTIONEND####

//

//========================================================================*/

#include <pkgconf/hal.h>

#include <cyg/infra/cyg_type.h>

#include <cyg/infra/cyg_trac.h>

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_intr.h>

#if 0

void trace( CYG_ADDRWORD tag, CYG_ADDRWORD a1, CYG_ADDRWORD a2)

{

    CYG_ADDRWORD **pp = (CYG_ADDRWORD **)0x48100000;

    CYG_ADDRWORD *ix = (CYG_ADDRWORD *)0x4810000C;

    CYG_ADDRWORD *p = *pp;

    *p++ = tag;

    *ix = *ix + 1;

    *p++ = *ix;

    *p++ = a1;

    *p++ = a2;

    *pp = p;

}

#endif

/*------------------------------------------------------------------------*/

#ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG

cyg_bool cyg_hal_stop_constructors;

#endif

void

cyg_hal_invoke_constructors(void)

{

    typedef void (*pfunc) (void);

    extern pfunc __CTOR_LIST__[];

    extern pfunc __CTOR_END__[];

#ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG

    static pfunc *p = &__CTOR_END__[-1];

    cyg_hal_stop_constructors = 0;

    for (; p >= __CTOR_LIST__; p--) {

        (*p) ();

        if (cyg_hal_stop_constructors) {

            p--;

            break;

        }

    }

#else

    pfunc *p;

    for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--)

        (*p) ();

#endif

} // cyg_hal_invoke_constructors()

/*------------------------------------------------------------------------*/

// Default ISR

externC cyg_uint32

hal_arch_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)

{

    return 0;

}

//--------------------------------------------------------------------------

/* Determine the index of the ls bit of the supplied mask.                */

cyg_uint32

hal_lsbit_index(cyg_uint32 mask)

{

    cyg_uint32 n = mask;

    static const signed char tab[64] =

    { -1, 0, 1, 12, 2, 6, 0, 13, 3, 0, 7, 0, 0, 0, 0, 14, 10,

      4, 0, 0, 8, 0, 0, 25, 0, 0, 0, 0, 0, 21, 27 , 15, 31, 11,

      5, 0, 0, 0, 0, 0, 9, 0, 0, 24, 0, 0 , 20, 26, 30, 0, 0, 0,

      0, 23, 0, 19, 29, 0, 22, 18, 28, 17, 16, 0

    };

    n &= ~(n-1UL);

    n = (n<<16)-n;

    n = (n<<6)+n;

    n = (n<<4)+n;

    return tab[n>>26];

}

/*------------------------------------------------------------------------*/

/* Determine the index of the ms bit of the supplied mask.                */

cyg_uint32

hal_msbit_index(cyg_uint32 mask)

{

    cyg_uint32 x = mask;

    cyg_uint32 w;

    /* Phase 1: make word with all ones from that one to the right */

    x |= x >> 16;

    x |= x >> 8;

    x |= x >> 4;

    x |= x >> 2;

    x |= x >> 1;

    /* Phase 2: calculate number of "1" bits in the word        */

    w = (x & 0x55555555) + ((x >> 1) & 0x55555555);

    w = (w & 0x33333333) + ((w >> 2) & 0x33333333);

    w = w + (w >> 4);

    w = (w & 0x000F000F) + ((w >> 8) & 0x000F000F);

    return (cyg_uint32)((w + (w >> 16)) & 0xFF);

}

/*------------------------------------------------------------------------*/

/* First level C exception handler.                                       */

externC void __handle_exception (void);

externC HAL_SavedRegisters *_hal_registers;

void

cyg_hal_exception_handler(HAL_SavedRegisters *regs,CYG_WORD vector)

{

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

    // Set the pointer to the registers of the current exception

    // context. At entry the GDB stub will expand the

    // HAL_SavedRegisters structure into a (bigger) register array.

    _hal_registers = regs;

    __handle_exception();

#endif

#if defined(CYGPKG_HAL_EXCEPTIONS)

    // We should decode the vector and pass a more appropriate

    // value as the second argument. For now we simply pass a

    // pointer to the saved registers. We should also divert

    // breakpoint and other debug vectors into the debug stubs.

    cyg_hal_deliver_exception( vector, (CYG_ADDRWORD)regs );

#endif

    return;

}

/*------------------------------------------------------------------------*/

/* default ISR                                                            */

#ifndef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT

externC cyg_uint32 hal_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)

{

#if defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT) && \

    defined(CYGHWR_HAL_GDB_PORT_VECTOR) &&         \

    defined(HAL_CTRLC_ISR)

#ifndef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN    

    if( vector == CYGHWR_HAL_GDB_PORT_VECTOR )

#endif        

    {

        cyg_uint32 result = HAL_CTRLC_ISR( vector, data );

        if( result != 0 ) return result;

    }

#endif

    CYG_TRACE1(true, "Interrupt: %d", vector);

    CYG_FAIL("Spurious Interrupt!!!");

    return 0;

}

#endif

/*------------------------------------------------------------------------*/

/* Idle thread activity.                                                  */

externC void hal_idle_thread_action(cyg_uint32 loop_count)

{

}

/*------------------------------------------------------------------------*/

/* End of hal_misc.c                                                      */