hal_intr.h

基于ecos的redboot

#ifndef CYGONCE_HAL_INTR_H
#define CYGONCE_HAL_INTR_H

//==========================================================================
//
//      hal_intr.h
//
//      HAL Interrupt and clock support
//
//==========================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc.
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    nickg, gthomas
// Contributors: nickg, gthomas,
//               jlarmour
// Date:         1999-02-20
// 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>

// This is to allow a variant to decide that there is no platform-specific
// interrupts file; and that in turn can be overridden by a platform that
// refines the variant's ideas.
#ifdef    CYGBLD_HAL_PLF_INTS_H
# include CYGBLD_HAL_PLF_INTS_H // should include variant data as required
#else 
# ifdef    CYGBLD_HAL_VAR_INTS_H
#  include CYGBLD_HAL_VAR_INTS_H
# else
#  include <cyg/hal/hal_platform_ints.h> // default less-complex platforms
# endif
#endif

// Spurious interrupt (no interrupt source could be found)
#define CYGNUM_HAL_INTERRUPT_NONE -1

//--------------------------------------------------------------------------
// ARM exception vectors.

// These vectors correspond to VSRs. These values are the ones to use for
// HAL_VSR_GET/SET

#define CYGNUM_HAL_VECTOR_RESET                0
#define CYGNUM_HAL_VECTOR_UNDEF_INSTRUCTION    1
#define CYGNUM_HAL_VECTOR_SOFTWARE_INTERRUPT   2
#define CYGNUM_HAL_VECTOR_ABORT_PREFETCH       3
#define CYGNUM_HAL_VECTOR_ABORT_DATA           4
#define CYGNUM_HAL_VECTOR_reserved             5
#define CYGNUM_HAL_VECTOR_IRQ                  6
#define CYGNUM_HAL_VECTOR_FIQ                  7

#define CYGNUM_HAL_VSR_MIN                     0
#define CYGNUM_HAL_VSR_MAX                     7
#define CYGNUM_HAL_VSR_COUNT                   8

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

#define CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION \
          CYGNUM_HAL_VECTOR_UNDEF_INSTRUCTION
#define CYGNUM_HAL_EXCEPTION_INTERRUPT \
          CYGNUM_HAL_VECTOR_SOFTWARE_INTERRUPT
#define CYGNUM_HAL_EXCEPTION_CODE_ACCESS    CYGNUM_HAL_VECTOR_ABORT_PREFETCH
#define CYGNUM_HAL_EXCEPTION_DATA_ACCESS    CYGNUM_HAL_VECTOR_ABORT_DATA

#define CYGNUM_HAL_EXCEPTION_MIN     CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION
#define CYGNUM_HAL_EXCEPTION_MAX     CYGNUM_HAL_EXCEPTION_DATA_ACCESS
#define CYGNUM_HAL_EXCEPTION_COUNT   (CYGNUM_HAL_EXCEPTION_MAX - \
                                      CYGNUM_HAL_EXCEPTION_MIN + 1)

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

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

// VSR table
externC CYG_ADDRESS    hal_vsr_table[CYGNUM_HAL_VSR_COUNT];

// Platform setup memory size (0 if unknown by hardware)
externC CYG_ADDRWORD   hal_dram_size;
// what, if anything, this means, is platform dependent:
externC CYG_ADDRWORD   hal_dram_type; 

#if CYGINT_HAL_ARM_MEM_REAL_REGION_TOP

externC cyg_uint8 *hal_arm_mem_real_region_top( cyg_uint8 *_regionend_ );
                                                
# define HAL_MEM_REAL_REGION_TOP( _regionend_ ) \
    hal_arm_mem_real_region_top( _regionend_ )
#endif

//--------------------------------------------------------------------------
// Default ISR
// The #define is used to test whether this routine exists, and to allow
// code outside the HAL 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

#ifndef __thumb__
// Note: This disables both FIQ and IRQ interrupts!
#define HAL_DISABLE_INTERRUPTS(_old_)           \
    asm volatile (                              \
        "mrs %0,cpsr;"                          \
        "mrs r4,cpsr;"                          \
        "orr r4,r4,#0xC0;"                      \
        "msr cpsr,r4"                           \
        : "=r"(_old_)                           \
        :                                       \
        : "r4"                                  \
        );

#define HAL_ENABLE_INTERRUPTS()                 \
    asm volatile (                              \
        "mrs r3,cpsr;"                          \
        "bic r3,r3,#0xC0;"                      \
        "msr cpsr,r3"                           \
        :                                       \
        :                                       \
        : "r3"                                  \
        );

#define HAL_RESTORE_INTERRUPTS(_old_)           \
    asm volatile (                              \
        "mrs r3,cpsr;"                          \
        "and r4,%0,#0xC0;"                      \
        "bic r3,r3,#0xC0;"                      \
        "orr r3,r3,r4;"                         \
        "msr cpsr,r3"                           \
        :                                       \
        : "r"(_old_)                            \
        : "r3", "r4"                            \
        );

#define HAL_QUERY_INTERRUPTS(_old_)             \
    asm volatile (                              \
        "mrs r4,cpsr;"                          \
        "and r4,r4,#0xC0;"                      \
        "eor %0,r4,#0xC0;"                      \
        : "=r"(_old_)                           \
        :                                       \
        : "r4"                                  \
        );
#else // __thumb__

// Thumb mode does not have access to the PSR registers;  

#if 0 // These don't seem to always work
#define HAL_DISABLE_INTERRUPTS(_old_)                   \
    asm volatile (                                      \
        "ldr r4,=10f;"                                  \
        "bx r4;"                                        \
        ".code 32;"                                     \