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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 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

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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

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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

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

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

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

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

extern void patch_dbg_syscalls(void * vector);

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

void hal_platform_init(void)

{

    HAL_ICACHE_INVALIDATE_ALL();

    HAL_ICACHE_ENABLE();

    HAL_DCACHE_INVALIDATE_ALL();

    HAL_DCACHE_ENABLE();

#if !defined(CYGHWR_HAL_MIPS_TX39_JMR3904_ENABLE_TOE)

    HAL_TX39_DEBUG_TOE_DISABLE();

#else

    HAL_TX39_DEBUG_TOE_ENABLE();

#endif

#if defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT)   && \

    defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon)

    {

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

    }

#endif

}

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

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

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

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_CygMon)

    // 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) );

        {

            typedef void install_bpt_fn(void *epc);

            CYG_WORD32 pc;

            HAL_SavedRegisters *sreg = (HAL_SavedRegisters *)regs;

            install_bpt_fn *ibp = (install_bpt_fn *)hal_vsr_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

}

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

/* Control C ISR support                                                  */

#if defined(CYGDBG_HAL_MIPS_DEBUG_GDB_CTRLC_SUPPORT)

#define DIAG_BASE       0xfffff300

#define DIAG_SLCR       (DIAG_BASE+0x00)

#define DIAG_SLSR       (DIAG_BASE+0x04)

#define DIAG_SLDICR     (DIAG_BASE+0x08)

#define DIAG_SLDISR     (DIAG_BASE+0x0C)

#define DIAG_SFCR       (DIAG_BASE+0x10)

#define DIAG_SBRG       (DIAG_BASE+0x14)

#define DIAG_TFIFO      (DIAG_BASE+0x20)

#define DIAG_RFIFO      (DIAG_BASE+0x30)

#define BRG_T0          0x0000

#define BRG_T2          0x0100

#define BRG_T4          0x0200

#define BRG_T5          0x0300

struct Hal_SavedRegisters *hal_saved_interrupt_state;

void hal_ctrlc_isr_init(void)

{

    CYG_WORD16 dicr;

    HAL_READ_UINT16( DIAG_SLDICR , dicr );

    dicr = 0x0001;

    HAL_WRITE_UINT16( DIAG_SLDICR , dicr );

    HAL_INTERRUPT_SET_LEVEL( CYGHWR_HAL_GDB_PORT_VECTOR, 1 );

    HAL_INTERRUPT_UNMASK( CYGHWR_HAL_GDB_PORT_VECTOR );

}

cyg_uint32 hal_ctrlc_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)

{

    char c;

    CYG_WORD16 disr;

    HAL_INTERRUPT_ACKNOWLEDGE( CYGHWR_HAL_GDB_PORT_VECTOR );

    HAL_READ_UINT16( DIAG_SLDISR , disr );

    if( disr & 0x0001 )

    {

        disr = disr & ~0x0001;

        HAL_READ_UINT8( DIAG_RFIFO, c );

        HAL_WRITE_UINT16( DIAG_SLDISR , disr );

        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                                                      */