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

//

//      plf_misc.c

//

//      HAL platform miscellaneous functions

//

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

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

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

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

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, 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.,    

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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 v2.                                               

//

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

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

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

// ####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

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

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

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

#include <cyg/hal/plf_z8530.h>

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

#ifdef CYGSEM_HAL_MIPS_VR4300_VRC437X_DIAG_ACKS_INT_0

static cyg_uint32 hal_int0_count = 0;

static cyg_uint32 hal_int0_isr( cyg_uint32 vector, cyg_uint32 data )

{

    hal_int0_count++;

    HAL_INTERRUPT_ACKNOWLEDGE( CYGNUM_HAL_INTERRUPT_VRC437X );

    return 0;

}

#endif

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

void hal_platform_init(void)

{

#ifdef CYGSEM_HAL_MIPS_VR4300_VRC437X_DIAG_ACKS_INT_0

    HAL_INTERRUPT_ATTACH( CYGNUM_HAL_INTERRUPT_VRC437X, hal_int0_isr, 0, 0 );

#endif

#if defined(CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT)

    // Set up eCos/ROM interfaces

    hal_if_init();

#endif    

#if defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT)      && \

    (defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon)    || \

     defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs))

    {

        extern CYG_ADDRESS hal_virtual_vector_table[32];

        void patch_dbg_syscalls( void * );

        patch_dbg_syscalls( (void *)(&hal_virtual_vector_table[0]) );

    }

#endif

}

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

// One-time PCI initialization.

void cyg_hal_plf_pci_init(void)

{

    cyg_uint8  next_bus;

    // Configure PCI bus.

    next_bus = 1;

    cyg_pci_configure_bus(0, &next_bus);

}

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

/* Functions to support the detection and execution of a user provoked    */

/* program break. These are usually called from interrupt routines.       */

#if !defined(CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT) && \

    defined(CYGDBG_HAL_MIPS_DEBUG_GDB_CTRLC_SUPPORT)

cyg_bool cyg_hal_is_break(char *buf, int size)

{

    while( size )

        if( buf[--size] == 0x03 ) return true;

    return false;

}

void cyg_hal_user_break( CYG_ADDRWORD *regs )

{

#if defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs)

    // The following code should be at the very start of this function so

    // that it can access the RA register before it is saved and reused.

    register CYG_WORD32 ra;

    asm volatile ( "move %0,$31;" : "=r" (ra) );

        {

            extern CYG_ADDRESS hal_virtual_vector_table[64];

            typedef void install_bpt_fn(void *epc);

            CYG_WORD32 pc;

            HAL_SavedRegisters *sreg = (HAL_SavedRegisters *)regs;

            install_bpt_fn *ibp = (install_bpt_fn *)hal_virtual_vector_table[35];

            if( regs == NULL ) pc = ra;

            else pc = sreg->pc;

            if( ibp != NULL ) ibp((void *)pc);

        }

#elif defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)

        {

            extern void breakpoint(void);

            breakpoint();

        }

#else

        HAL_BREAKPOINT(breakinst);

#endif

}

#endif

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

/* Control C ISR support                                                  */

#if !defined(CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT) && \

    defined(CYGDBG_HAL_MIPS_DEBUG_GDB_CTRLC_SUPPORT)

#if CYGHWR_HAL_MIPS_VR4300_VRC437X_GDB_PORT == 0

#define DUART_CHAN      DUART_A

#else

#define DUART_CHAN      DUART_B

#endif

struct Hal_SavedRegisters *hal_saved_interrupt_state;

void hal_ctrlc_isr_init(void)

{

    HAL_DUART_WRITE_CR( DUART_CHAN, 1, 0x10 );

    HAL_DUART_WRITE_CR( DUART_CHAN, 9, 0x0a );

    HAL_INTERRUPT_SET_LEVEL( CYGHWR_HAL_GDB_PORT_VECTOR, 0 );

    HAL_INTERRUPT_UNMASK( CYGHWR_HAL_GDB_PORT_VECTOR );

}

cyg_uint32 hal_ctrlc_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)

{

    char c;

    cyg_uint8 rr0;

    HAL_INTERRUPT_ACKNOWLEDGE( CYGHWR_HAL_GDB_PORT_VECTOR );

    HAL_DUART_READ_CR(DUART_CHAN, 0, rr0 );

    // The following return value prevents a spurious interrupt report.

    // That is what should happen, but for some reason we get the odd extra

    // character when running in the test farm. 

    if ( (rr0 & 0x01) == 0 ) return 2;

    HAL_DUART_READ_RR( DUART_CHAN, c );

    if( cyg_hal_is_break( &c , 1 ) )

        cyg_hal_user_break( (CYG_ADDRWORD *)hal_saved_interrupt_state );

    return 2;

}

#endif

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

/* End of plf_misc.c                                                      */