hal_intr.h

ecos为实时嵌入式操作系统

externC volatile CYG_ADDRESS    hal_interrupt_handlers[CYGNUM_HAL_VSR_COUNT];
externC volatile CYG_ADDRWORD   hal_interrupt_data[CYGNUM_HAL_VSR_COUNT];
externC volatile CYG_ADDRESS    hal_interrupt_objects[CYGNUM_HAL_VSR_COUNT];
// (interrupt_objects only used in the interrupt case _but_ the interrupt
//  attach &co macros write it, so keep it full-sized)

//---------------------------------------------------------------------------
// Default ISRs for exception/interrupt handing.

// note that these have the same ABI apart from the extra SP parameter
// for exceptions.

externC cyg_uint32 hal_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data);
// return code from ISR is passed to interrupt_end() in the kernel.

externC void cyg_hal_exception_handler(CYG_ADDRWORD vector,
                                       CYG_ADDRWORD data,
                                       CYG_ADDRWORD stackpointer);

//---------------------------------------------------------------------------
// Default VSRs for exception/interrupt handing.

// note that these do not have a C ABI as such; they are *vector* service
// routines and are written in assembler.

externC void hal_default_exception_vsr( void );
externC void hal_default_interrupt_vsr( void );

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

typedef cyg_uint32 CYG_INTERRUPT_STATE;

//---------------------------------------------------------------------------
// Interrupt control macros

// THIS ONE IS NOT A STANDARD HAL ENTRY (HAL_DISABLE_TRAPS)
// (so should be unused externally)
#define HAL_DISABLE_TRAPS(_old_)                \
    asm volatile (                              \
        "rd     %%psr, %0;"                     \
        "andn   %0, 0x20, %%l7;"                \
        "wr     %%l7, %%psr;"                   \
        "nop; nop; nop"                         \
        : "=r"(_old_)                           \
        :                                       \
        : "l7"                                  \
        );

// THIS ONE IS NOT A STANDARD HAL ENTRY (HAL_QUERY_TRAPS)
// (so should be unused externally)
#define HAL_QUERY_TRAPS(_old_)                  \
    asm volatile (                              \
        "rd     %%psr, %%l7;"                   \
        "and    %%l7, 0x020, %0"                \
        : "=r"(_old_)                           \
        :                                       \
        : "l7"                                  \
        );

#define HAL_DISABLE_INTERRUPTS(_old_)           \
    asm volatile (                              \
        "rd     %%psr, %0;"                     \
        "or     %0, 0xf00, %%l7;"               \
        "wr     %%l7, %%psr;"                   \
        "nop; nop; nop"                         \
        : "=r"(_old_)                           \
        :                                       \
        : "l7"                                  \
        );

#define HAL_ENABLE_INTERRUPTS()                 \
    asm volatile (                              \
        "rd     %%psr, %%l7;"                   \
        "andn   %%l7, 0xf00, %%l7;"             \
        "or     %%l7, 0x020, %%l7;"             \
        "wr     %%l7, %%psr;"                   \
        "nop; nop; nop"                         \
        :                                       \
        :                                       \
        : "l7"                                  \
        );

#define HAL_RESTORE_INTERRUPTS(_old_)           \
    asm volatile (                              \
        "rd     %%psr, %%l7;"                   \
        "andn   %%l7, 0xf20, %%l7;"             \
        "and    %0 , 0xf20, %%l6;"              \
        "wr     %%l6, %%l7, %%psr;"             \
        "nop; nop; nop"                         \
        :                                       \
        : "r"(_old_)                            \
        : "l6","l7"                             \
        );

#define HAL_QUERY_INTERRUPTS(_old_)             \
    asm volatile (                              \
        "rd     %%psr, %%l7;"                   \
        "and    %%l7, 0xf00, %%l7;"             \
        "xor    %%l7, 0xf00, %0"                \
        : "=r"(_old_)                           \
        :                                       \
        : "l7"                                  \
        );


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

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

#define HAL_INTERRUPT_ATTACH( _vector_, _isr_, _data_, _object_ )           \
    CYG_MACRO_START                                                         \
    if( (CYG_ADDRESS)hal_default_isr  == hal_interrupt_handlers[_vector_] ||\
        (CYG_ADDRESS)cyg_hal_exception_handler ==                           \
        hal_interrupt_handlers[_vector_] )                                  \
    {                                                                       \
        hal_interrupt_handlers[_vector_] = (CYG_ADDRESS)_isr_;              \
        hal_interrupt_data[_vector_] = (CYG_ADDRWORD) _data_;               \
        hal_interrupt_objects[_vector_] = (CYG_ADDRESS)_object_;            \
    }                                                                       \
CYG_MACRO_END                                                           
                                                                            
#define HAL_INTERRUPT_DETACH( _vector_, _isr_ ) CYG_MACRO_START             \
    if( hal_interrupt_handlers[_vector_] == (CYG_ADDRESS)_isr_ )            \
    {                                                                       \
        hal_interrupt_handlers[_vector_] =                                  \
           (CYG_VECTOR_IS_INTERRUPT( _vector_ )                             \
              ? (CYG_ADDRESS)hal_default_isr                                \
              : (CYG_ADDRESS)cyg_hal_exception_handler);                    \
        hal_interrupt_data[_vector_] = 0;                                   \
        hal_interrupt_objects[_vector_] = 0;                                \
    }                                                                       \
CYG_MACRO_END

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

#define HAL_VSR_SET( _vector_, _vsr_, _poldvsr_ ) CYG_MACRO_START           \
    if( _poldvsr_ != NULL )                                                 \
        *(CYG_ADDRESS *)_poldvsr_ = 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.

#define HAL_VSR_SET_TO_ECOS_HANDLER( _vector_, _poldvsr_ ) CYG_MACRO_START  \
    if( _poldvsr_ != NULL )                                                 \
        *(CYG_ADDRESS *)_poldvsr_ = hal_vsr_table[_vector_];                \
    hal_vsr_table[_vector_] = ( CYG_VECTOR_IS_INTERRUPT( _vector_ )         \
                              ? (CYG_ADDRESS)hal_default_interrupt_vsr      \
                              : (CYG_ADDRESS)hal_default_exception_vsr );   \
CYG_MACRO_END



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

// Which PIC (if any) is available is dependent on the board.
// This sets up that stuff:

#include <cyg/hal/hal_xpic.h>

// Ditto the clock(s)
// This defines all the clock macros the kernel requires:

#include <cyg/hal/hal_clock.h>

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