hal_intr.h

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#ifndef CYGONCE_HAL_INTR_H
#define CYGONCE_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.
// Copyright (C) 2002 Gary Thomas
//
// 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,
//               jlarmour
// Date:         1999-02-19
// 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>         // types

#include <cyg/hal/ppc_regs.h>           // register definitions

#include <cyg/hal/var_intr.h>           // variant extensions

//--------------------------------------------------------------------------
// PowerPC exception vectors. These correspond to VSRs and are the values
// to use for HAL_VSR_GET/SET

#define CYGNUM_HAL_VECTOR_RESERVED_0        0
#define CYGNUM_HAL_VECTOR_RESET             1
#define CYGNUM_HAL_VECTOR_MACHINE_CHECK     2
#define CYGNUM_HAL_VECTOR_DSI               3
#define CYGNUM_HAL_VECTOR_ISI               4
#define CYGNUM_HAL_VECTOR_INTERRUPT         5
#define CYGNUM_HAL_VECTOR_ALIGNMENT         6
#define CYGNUM_HAL_VECTOR_PROGRAM           7
#define CYGNUM_HAL_VECTOR_FP_UNAVAILABLE    8
#define CYGNUM_HAL_VECTOR_DECREMENTER       9
#define CYGNUM_HAL_VECTOR_RESERVED_A        10
#define CYGNUM_HAL_VECTOR_RESERVED_B        11
#define CYGNUM_HAL_VECTOR_SYSTEM_CALL       12
#define CYGNUM_HAL_VECTOR_TRACE             13
#define CYGNUM_HAL_VECTOR_FP_ASSIST         14

#define CYGNUM_HAL_VSR_MIN                   CYGNUM_HAL_VECTOR_RESERVED_0
#ifndef CYGNUM_HAL_VSR_MAX
# define CYGNUM_HAL_VSR_MAX                  CYGNUM_HAL_VECTOR_FP_ASSIST
#endif
#define CYGNUM_HAL_VSR_COUNT                 ( CYGNUM_HAL_VSR_MAX + 1 )

#ifndef CYG_VECTOR_IS_INTERRUPT
# define CYG_VECTOR_IS_INTERRUPT(v)   \
     (CYGNUM_HAL_VECTOR_INTERRUPT == (v) \
      || CYGNUM_HAL_VECTOR_DECREMENTER == (v))
#endif

// The decoded interrupts.
// Define decrementer as the first interrupt since it is guaranteed to
// be defined on all PowerPCs. External may expand into several interrupts
// depending on interrupt controller capabilities.
#define CYGNUM_HAL_INTERRUPT_DECREMENTER     0
#define CYGNUM_HAL_INTERRUPT_EXTERNAL        1

#define CYGNUM_HAL_ISR_MIN                   CYGNUM_HAL_INTERRUPT_DECREMENTER
#ifndef CYGNUM_HAL_ISR_MAX
# define CYGNUM_HAL_ISR_MAX                  CYGNUM_HAL_INTERRUPT_EXTERNAL
#endif
#define CYGNUM_HAL_ISR_COUNT                 ( CYGNUM_HAL_ISR_MAX + 1 )

#ifndef CYGHWR_HAL_EXCEPTION_VECTORS_DEFINED
// Exception vectors. These are the values used when passed out to an
// external exception handler using cyg_hal_deliver_exception()

#define CYGNUM_HAL_EXCEPTION_RESERVED_0      CYGNUM_HAL_VECTOR_RESERVED_0
#define CYGNUM_HAL_EXCEPTION_MACHINE_CHECK   CYGNUM_HAL_VECTOR_MACHINE_CHECK
#define CYGNUM_HAL_EXCEPTION_DATA_ACCESS     CYGNUM_HAL_VECTOR_DSI
#define CYGNUM_HAL_EXCEPTION_CODE_ACCESS     CYGNUM_HAL_VECTOR_ISI
#define CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_ACCESS  \
           CYGNUM_HAL_VECTOR_ALIGNMENT
#define CYGNUM_HAL_EXCEPTION_FPU_NOT_AVAIL   CYGNUM_HAL_VECTOR_FP_UNAVAILABLE
#define CYGNUM_HAL_EXCEPTION_RESERVED_A      CYGNUM_HAL_VECTOR_RESERVED_A
#define CYGNUM_HAL_EXCEPTION_RESERVED_B      CYGNUM_HAL_VECTOR_RESERVED_B
#define CYGNUM_HAL_EXCEPTION_SYSTEM_CALL     CYGNUM_HAL_VECTOR_SYSTEM_CALL
#define CYGNUM_HAL_EXCEPTION_TRACE           CYGNUM_HAL_VECTOR_TRACE
#define CYGNUM_HAL_EXCEPTION_FP_ASSIST       CYGNUM_HAL_VECTOR_FP_ASSIST

#define CYGNUM_HAL_EXCEPTION_MIN             CYGNUM_HAL_EXCEPTION_RESERVED_0
#ifndef CYGNUM_HAL_EXCEPTION_MAX
#define CYGNUM_HAL_EXCEPTION_MAX             CYGNUM_HAL_VSR_MAX
#endif

#define CYGHWR_HAL_EXCEPTION_VECTORS_DEFINED

#endif // CYGHWR_HAL_EXCEPTION_VECTORS_DEFINED

// FIXME: This is still rather ugly. Should probably be made variant
//        specific using a decode_hal_exception macro or somesuch.
// decoded exception vectors
#define CYGNUM_HAL_EXCEPTION_TRAP                     (-1)
#define CYGNUM_HAL_EXCEPTION_PRIVILEGED_INSTRUCTION   (-2)
#define CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION      (-3)
#define CYGNUM_HAL_EXCEPTION_FPU                      (-4)

#undef  CYGNUM_HAL_EXCEPTION_MIN
#define CYGNUM_HAL_EXCEPTION_MIN             CYGNUM_HAL_EXCEPTION_FPU


#define CYGNUM_HAL_EXCEPTION_COUNT           \
                 ( CYGNUM_HAL_EXCEPTION_MAX - CYGNUM_HAL_EXCEPTION_MIN + 1 )

//--------------------------------------------------------------------------
// 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_COUNT];

//--------------------------------------------------------------------------
// Default ISRs
// 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);
externC cyg_uint32 hal_default_decrementer_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

#define HAL_DISABLE_INTERRUPTS(_old_)                   \
    CYG_MACRO_START                                     \
    cyg_uint32 tmp1, tmp2;                              \
    asm volatile (                                      \
        "mfmsr  %0;"                                    \
        "mr     %2,%0;"                                 \
        "li     %1,0;"                                  \
        "rlwimi %2,%1,0,16,16;"                         \
        "mtmsr  %2;"                                    \
        : "=r"(_old_), "=r" (tmp1), "=r" (tmp2));       \
    CYG_MACRO_END

#define HAL_ENABLE_INTERRUPTS()         \
    CYG_MACRO_START                     \
    cyg_uint32 tmp1, tmp2;              \
    asm volatile (                      \
        "mfmsr  %0;"                    \
        "ori    %1,%1,0x8000;"          \
        "rlwimi %0,%1,0,16,16;"         \
        "mtmsr  %0;"                    \
        : "=r" (tmp1), "=r" (tmp2));    \
    CYG_MACRO_END

#define HAL_RESTORE_INTERRUPTS(_old_)   \
    CYG_MACRO_START                     \
    cyg_uint32 tmp;                     \
    asm volatile (                      \
        "mfmsr  %0;"                    \
        "rlwimi %0,%1,0,16,16;"         \
        "mtmsr  %0;"                    \
        : "=&r" (tmp)                   \
        : "r" (_old_));                 \
    CYG_MACRO_END

#define HAL_QUERY_INTERRUPTS(_old_)     \
    CYG_MACRO_START                     \
    cyg_uint32 tmp;                     \
    asm volatile (                      \
        "mfmsr  %0;"                    \
        "lis    %1,0;"                  \
        "ori    %1,%1,0x8000;"          \
        "and    %0,%0,%1;"              \
        : "=&r"(_old_), "=r" (tmp));     \
    CYG_MACRO_END