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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.

//

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// for more details.

//

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// 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

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//####ECOSGPLCOPYRIGHTEND####

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

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

//

// Author(s):    nickg

// Contributors: nickg, jlarmour

// Date:         1999-01-21

// 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>         // Base types

#include <cyg/infra/cyg_trac.h>         // tracing macros

#include <cyg/infra/cyg_ass.h>          // assertion macros

#define CYGARC_HAL_COMMON_EXPORT_CPU_MACROS

#include <cyg/hal/hal_arch.h>           // architectural definitions

#include <cyg/hal/hal_intr.h>           // Interrupt handling

#include <cyg/hal/hal_cache.h>          // Cache handling

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

/* If required, define a variable to store the clock period.              */

#ifdef CYGHWR_HAL_CLOCK_PERIOD_DEFINED

CYG_WORD32 cyg_hal_clock_period;

#endif

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

/* First level C exception handler.                                       */

externC void __handle_exception (void);

externC HAL_SavedRegisters *_hal_registers;

externC void* volatile __mem_fault_handler;

externC cyg_uint32 cyg_hal_exception_handler(HAL_SavedRegisters *regs)

{

    int vec = regs->vector;

    // adjust PC after 'break' insns

    if (vec == CYGNUM_HAL_VECTOR_IRQ) {

        if (__read_prog_uint16((void *)(regs->spc_irq - 2)) == HAL_BREAKINST)

            regs->spc_irq -= 2;

    }

#if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)

    // If we caught an exception inside the stubs, see if we were expecting it

    // and if so jump to the saved address

    if (__mem_fault_handler) {

        switch (vec) {

          case CYGNUM_HAL_VECTOR_SWI:

            regs->a[6] = (CYG_ADDRWORD)__mem_fault_handler;

            break;

          case CYGNUM_HAL_VECTOR_FIQ:

            regs->spc_fiq = (CYG_ADDRWORD)__mem_fault_handler;

            break;

          default:

            regs->spc_irq = (CYG_ADDRWORD)__mem_fault_handler;

            break;

        }

        return 0; // Caught an exception inside 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();

#elif defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && 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( vec, (CYG_ADDRWORD)regs );

#else

    CYG_FAIL("Exception!!!");

#endif    

    return 0;

}

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

/* default ISR                                                            */

#ifndef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT

externC cyg_uint32 hal_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)

{

#if defined(CYGDBG_HAL_CALM32_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;

    }

#if defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon)

#if defined(HAL_DIAG_IRQ_CHECK)

    {

        cyg_uint32 ret;

        /* let ROM monitor handle unexpected interrupts */

        HAL_DIAG_IRQ_CHECK(vector, ret);

        if (ret<=0)

            return ret;

    }

#endif // def HAL_DIAG_IRQ_CHECK

#endif // def CYGSEM_HAL_USE_ROM_MONITOR_CygMon

#endif

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

    CYG_FAIL("Spurious Interrupt!!!");

    return 0;

}

#else // CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT

externC cyg_uint32 hal_arch_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)

{

#if defined(CYGDBG_HAL_CALM16_DEBUG_GDB_CTRLC_SUPPORT) &&      \

    defined(CYGHWR_HAL_GDB_PORT_VECTOR) &&              \

    defined(HAL_CTRLC_ISR)

#if defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon)

#if defined(HAL_DIAG_IRQ_CHECK)

    {

        cyg_uint32 ret;

        /* let ROM monitor handle unexpected interrupts */

        HAL_DIAG_IRQ_CHECK(vector, ret);

        if (ret<=0)

            return ret;

    }

#endif // def HAL_DIAG_IRQ_CHECK

#endif // def CYGSEM_HAL_USE_ROM_MONITOR_CygMon

#endif

    return 0;

}

#endif // CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT

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

/* data copy and bss zero functions                                       */

typedef void (CYG_SYM_ADDRESS)(void);

// All these must use this type of address to stop them being given relocations

// relative to $gp (i.e. assuming they would be in .sdata)

extern CYG_SYM_ADDRESS __ram_data_start;

extern CYG_SYM_ADDRESS __ram_data_end;

extern CYG_SYM_ADDRESS __rom_data_start;

#ifdef CYG_HAL_STARTUP_ROM      

void hal_copy_data(void)

{

    short *p = (short *)&__ram_data_start;

    short *q = (short *)&__rom_data_start;

    short x;

    while( p != (short *)&__ram_data_end ) {

        asm volatile( "ldc %0,@%1\n" : "=r"(x) : "r"(q) );

        *p++ = x;

        q++;

    }

}

#endif

extern CYG_SYM_ADDRESS __bss_start;

extern CYG_SYM_ADDRESS __bss_end;

void hal_zero_bss(void)

{

    short *p = (short *)&__bss_start;

    while( p != (short *)&__bss_end )

        *p++ = 0;

}

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

#ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG

cyg_bool cyg_hal_stop_constructors;

#endif

typedef void (*pfunc) (void);

extern pfunc __CTOR_LIST__[];

extern pfunc __CTOR_END__[];

void

cyg_hal_invoke_constructors(void)

{

#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()

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

/* 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) - 1;

}

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

/* Idle thread action                                                     */

#include <cyg/infra/diag.h>

void hal_idle_thread_action( cyg_uint32 count )

{

}

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

/* End of hal_misc.c                                                      */