hal_intr.h

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#ifndef CYGONCE_HAL_HAL_INTR_H
#define CYGONCE_HAL_HAL_INTR_H

//==========================================================================
//
//      hal_intr.h
//
//      HAL Interrupt and clock support
//
//==========================================================================
//####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: nickg, jskov,
//               gthomas, jlarmour, msalter
// Date:         1999-02-16
// Purpose:      Define Interrupt support
// Description:  The macros defined here provide the HAL APIs for handling
//               interrupts and the clock.
//              
// Usage:
//              #include <cyg/hal/hal_intr.h>
//              ...
//              
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/hal.h>

#include <cyg/infra/cyg_type.h>
#include <cyg/hal/hal_io.h>

#include <cyg/hal/var_intr.h>

//--------------------------------------------------------------------------
// MIPS vectors. 

// These are the exception codes presented in the Cause register and
// correspond to VSRs. These values are the ones to use for HAL_VSR_GET/SET


#define CYGNUM_HAL_VECTOR_FIQ      0  // External Fast Interrupt
#define CYGNUM_HAL_VECTOR_IRQ      1  // External Interrupt
#define CYGNUM_HAL_VECTOR_COP      2  // Coprocessor Exception
#define CYGNUM_HAL_VECTOR_DABRT    3  // Data abort
#define CYGNUM_HAL_VECTOR_IABRT    4  // Instruction abort
#define CYGNUM_HAL_VECTOR_PRIV     5  // Privilege violation
#define CYGNUM_HAL_VECTOR_UNIMPL   6  // Unimplemented Insn
#define CYGNUM_HAL_VECTOR_TRACE    7  // Single-step
#define CYGNUM_HAL_VECTOR_SWI      8  // SWI

#define CYGNUM_HAL_VSR_MIN                     0
#define CYGNUM_HAL_VSR_MAX                     8
#define CYGNUM_HAL_VSR_COUNT                   9

// Min/Max exception numbers and how many there are
#define CYGNUM_HAL_EXCEPTION_MIN                0
#define CYGNUM_HAL_EXCEPTION_MAX                CYGNUM_HAL_VSR_MAX

#define CYGNUM_HAL_EXCEPTION_COUNT           \
                 ( CYGNUM_HAL_EXCEPTION_MAX - CYGNUM_HAL_EXCEPTION_MIN + 1 )


#ifndef CYGHWR_HAL_INTERRUPT_VECTORS_DEFINED
#define CYGNUM_HAL_FAST_INTERRUPT           0
#define CYGNUM_HAL_INTERRUPT                1

// Min/Max ISR numbers and how many there are
#define CYGNUM_HAL_ISR_MIN                     0
#define CYGNUM_HAL_ISR_MAX                     1
#define CYGNUM_HAL_ISR_COUNT                   2

#define CYGHWR_HAL_INTERRUPT_VECTORS_DEFINED
#endif

//--------------------------------------------------------------------------
// Static data used by HAL

// ISR tables
externC volatile CYG_ADDRESS    hal_interrupt_handlers[CYGNUM_HAL_ISR_COUNT];
externC volatile CYG_ADDRWORD   hal_interrupt_data[CYGNUM_HAL_ISR_COUNT];
externC volatile CYG_ADDRESS    hal_interrupt_objects[CYGNUM_HAL_ISR_COUNT];

// VSR table
externC volatile CYG_ADDRESS    hal_vsr_table[CYGNUM_HAL_VSR_MAX+1];

//--------------------------------------------------------------------------
// Default ISR
// The #define is used to test whether this routine exists, and to allow
// us to call it.

externC cyg_uint32 hal_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data);

#define HAL_DEFAULT_ISR hal_default_isr

//--------------------------------------------------------------------------
// Interrupt state storage

typedef cyg_uint32 CYG_INTERRUPT_STATE;

//--------------------------------------------------------------------------
// Interrupt control macros
// Beware of nops in this code. They fill delay slots and avoid CP0 hazards
// that might otherwise cause following code to run in the wrong state or
// cause a resource conflict.

#define HAL_DISABLE_INTERRUPTS(_old_)
#define HAL_ENABLE_INTERRUPTS()
#define HAL_RESTORE_INTERRUPTS(_old_)
#define HAL_QUERY_INTERRUPTS( _state_ )

//--------------------------------------------------------------------------
// Routine to execute DSRs using separate interrupt stack

#ifdef  CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK
externC void hal_interrupt_stack_call_pending_DSRs(void);
#define HAL_INTERRUPT_STACK_CALL_PENDING_DSRS() \
    hal_interrupt_stack_call_pending_DSRs()

// these are offered solely for stack usage testing
// if they are not defined, then there is no interrupt stack.
#define HAL_INTERRUPT_STACK_BASE cyg_interrupt_stack_base
#define HAL_INTERRUPT_STACK_TOP  cyg_interrupt_stack
// use them to declare these extern however you want:
//       extern char HAL_INTERRUPT_STACK_BASE[];
//       extern char HAL_INTERRUPT_STACK_TOP[];
// is recommended
#endif

//--------------------------------------------------------------------------
// Vector translation.
// For chained interrupts we only have a single vector though which all
// are passed. For unchained interrupts we have a vector per interrupt.

#ifndef HAL_TRANSLATE_VECTOR

#if defined(CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN)

#define HAL_TRANSLATE_VECTOR(_vector_,_index_) (_index_) = 0

#else

#define HAL_TRANSLATE_VECTOR(_vector_,_index_) (_index_) = (_vector_)

#endif

#endif

//--------------------------------------------------------------------------
// Interrupt and VSR attachment macros

#define HAL_INTERRUPT_IN_USE( _vector_, _state_)                          \
    CYG_MACRO_START                                                       \
    cyg_uint32 _index_;                                                   \
    HAL_TRANSLATE_VECTOR ((_vector_), _index_);                           \
                                                                          \
    if( hal_interrupt_handlers[_index_] == (CYG_ADDRESS)HAL_DEFAULT_ISR ) \
        (_state_) = 0;                                                    \
    else                                                                  \
        (_state_) = 1;                                                    \
    CYG_MACRO_END

#define HAL_INTERRUPT_ATTACH( _vector_, _isr_, _data_, _object_ )           \
{                                                                           \
    cyg_uint32 _index_;                                                     \
    HAL_TRANSLATE_VECTOR( _vector_, _index_ );                              \
                                                                            \
    if( hal_interrupt_handlers[_index_] == (CYG_ADDRESS)HAL_DEFAULT_ISR )   \
    {                                                                       \
        hal_interrupt_handlers[_index_] = (CYG_ADDRESS)_isr_;               \
        hal_interrupt_data[_index_] = (CYG_ADDRWORD)_data_;                 \
        hal_interrupt_objects[_index_] = (CYG_ADDRESS)_object_;             \
    }                                                                       \
}

#define HAL_INTERRUPT_DETACH( _vector_, _isr_ )                         \
{                                                                       \
    cyg_uint32 _index_;                                                 \
    HAL_TRANSLATE_VECTOR( _vector_, _index_ );                          \
                                                                        \
    if( hal_interrupt_handlers[_index_] == (CYG_ADDRESS)_isr_ )         \
    {                                                                   \
        hal_interrupt_handlers[_index_] = (CYG_ADDRESS)HAL_DEFAULT_ISR; \
        hal_interrupt_data[_index_] = 0;                                \
        hal_interrupt_objects[_index_] = 0;                             \
    }                                                                   \
}

#define HAL_VSR_GET( _vector_, _pvsr_ )                 \
    *(_pvsr_) = (void (*)())hal_vsr_table[_vector_];
    

#define HAL_VSR_SET( _vector_, _vsr_, _poldvsr_ ) CYG_MACRO_START         \
    if( (void*)_poldvsr_ != NULL)                                         \
        *(CYG_ADDRESS *)_poldvsr_ = (CYG_ADDRESS)hal_vsr_table[_vector_]; \
    hal_vsr_table[_vector_] = (CYG_ADDRESS)_vsr_;                         \
CYG_MACRO_END

// This is an ugly name, but what it means is: grab the VSR back to eCos
// internal handling, or if you like, the default handler.  But if
// cooperating with GDB and CygMon, the default behaviour is to pass most
// exceptions to CygMon.  This macro undoes that so that eCos handles the
// exception.  So use it with care.

externC void __default_exception_vsr(void);
externC void __default_interrupt_vsr(void);
externC void __break_vsr_springboard(void);

#define HAL_VSR_SET_TO_ECOS_HANDLER( _vector_, _poldvsr_ ) CYG_MACRO_START  \
    HAL_VSR_SET( _vector_, _vector_ == CYGNUM_HAL_VECTOR_INTERRUPT          \
                              ? (CYG_ADDRESS)__default_interrupt_vsr        \
                              : _vector_ == CYGNUM_HAL_VECTOR_BREAKPOINT    \
                                ? (CYG_ADDRESS)__break_vsr_springboard      \
                                : (CYG_ADDRESS)__default_exception_vsr,     \
                 _poldvsr_ );                                               \
CYG_MACRO_END

//--------------------------------------------------------------------------
// Interrupt controller access
// The default code here simply uses the fields present in the CP0 status
// and cause registers to implement this functionality.
// Beware of nops in this code. They fill delay slots and avoid CP0 hazards
// that might otherwise cause following code to run in the wrong state or
// cause a resource conflict.

#ifndef CYGHWR_HAL_INTERRUPT_CONTROLLER_ACCESS_DEFINED

#define HAL_INTERRUPT_MASK( _vector_ )

#define HAL_INTERRUPT_UNMASK( _vector_ )

#define HAL_INTERRUPT_ACKNOWLEDGE( _vector_ )

#define HAL_INTERRUPT_CONFIGURE( _vector_, _level_, _up_ )

#define HAL_INTERRUPT_SET_LEVEL( _vector_, _level_ )

#define CYGHWR_HAL_INTERRUPT_CONTROLLER_ACCESS_DEFINED

#endif

//--------------------------------------------------------------------------
// Clock control.
// This code uses the count and compare registers that are present in many
// MIPS variants.
// Beware of nops in this code. They fill delay slots and avoid CP0 hazards
// that might otherwise cause following code to run in the wrong state or
// cause a resource conflict.

#ifndef CYGHWR_HAL_CLOCK_CONTROL_DEFINED

externC CYG_WORD32 cyg_hal_clock_period;
#define CYGHWR_HAL_CLOCK_PERIOD_DEFINED

#define HAL_CLOCK_INITIALIZE( _period_ )

#define HAL_CLOCK_RESET( _vector_, _period_ )

#define HAL_CLOCK_READ( _pvalue_ )

#define CYGHWR_HAL_CLOCK_CONTROL_DEFINED

#endif

//--------------------------------------------------------------------------
#endif // ifndef CYGONCE_HAL_HAL_INTR_H
// End of hal_intr.h