Subversion Repositories openrisc

//==========================================================================
//
//      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
 
/*------------------------------------------------------------------------*/
 
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                                                      */