Subversion Repositories openrisc_me

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

//

//      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.

//

// eCos 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 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

// License. However the source code for this file must still be made available

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

//

// This exception does not invalidate any other reasons why a work based on

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

//

// 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: proven, pjo

// Date:        1999-02-20

// 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_ass.h>

#include <cyg/infra/diag.h>      // diag_printf

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_if.h>

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

#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

}

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

// First level C exception handler.

externC void __handle_exception (void);

externC HAL_SavedRegisters *_hal_registers;

externC void* volatile __mem_fault_handler;

void

cyg_hal_exception_handler(HAL_SavedRegisters *regs)

{

#if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS) && !defined(CYGPKG_CYGMON)

    // 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) {

        regs->pc = (CYG_ADDRWORD)__mem_fault_handler;

        return; // Caught an exception inside stubs        

    }

    _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( regs->vector>>8, (CYG_ADDRWORD)regs );

#else

    CYG_FAIL("Exception!!!");

#endif    

    return;

}

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

/* default architecture ISR                                               */

/* The real default ISR is in hal/common/.../src/hal_misc.c               */

externC cyg_uint32 hal_arch_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)

{

    // For some reason I seem to be geting spurious interrupts on

    // interrupt 0x27(39). This is the parallel port. This is masked

    // in the PIC so the exact reason for these is a mystery. They do

    // appear to be real interrupts since they always appear just

    // after a clear of the interrupt flag, and the stack shows a

    // proper interrupt context being pushed by the hardware. This may

    // be some feature of the Celeron CPU I am using. 

    if( vector == 0x27 )

        return 2;

    diag_printf("hal_arch_default_isr: %d (data: %d)\n", vector,data);

    CYG_FAIL("Spurious Interrupt!!!");

    return 0;

}

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

// End of hal_misc.c