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#ifndef CYGONCE_HAL_HAL_ARBITER_H #define CYGONCE_HAL_HAL_ARBITER_H //============================================================================= // // hal_arbiter.h // // Functionality used by ISR arbiters // //============================================================================= //####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): jskov // Contributors:jskov // Date: 2001-06-29 // Purpose: Functionality used by ISR arbiters // Usage: #include <cyg/hal/hal_arbiter.h> // //####DESCRIPTIONEND#### // //============================================================================= #include <cyg/hal/hal_intr.h> // hal_interrupt_x tables #include <cyg/hal/drv_api.h> // CYG_ISR_HANDLED //============================================================================= // Function used to call ISRs from ISR arbiters // An arbiter is hooked on the shared interrupt vector and looks like this: // // cyg_uint32 _arbitration_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data) // { // cyg_uint32 isr_ret; // // decode interrupt source and for each active source call the ISR // if (source_A_active) { // isr_ret = hal_call_isr (CYGNUM_HAL_INTERRUPT_SOURCE_A); // #ifdef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN // if (isr_ret & CYG_ISR_HANDLED) // #endif // return isr_ret; // } // if (source_B_active) { // isr_ret = hal_call_isr (CYGNUM_HAL_INTERRUPT_SOURCE_B); // #ifdef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN // if (isr_ret & CYG_ISR_HANDLED) // #endif // return isr_ret; // } // ... // return 0; // } // // Remember to attach and enable the arbiter source: // HAL_INTERRUPT_ATTACH(CYGNUM_HAL_INTERRUPT_ARBITER, &_arbitration_isr, 0, 0); // HAL_INTERRUPT_SET_LEVEL(CYGNUM_HAL_INTERRUPT_ARBITER, 1); // HAL_INTERRUPT_UNMASK(CYGNUM_HAL_INTERRUPT_ARBITER); // typedef cyg_uint32 cyg_ISR(cyg_uint32 vector, CYG_ADDRWORD data); extern void cyg_interrupt_post_dsr( CYG_ADDRWORD intr_obj ); #ifndef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN static inline cyg_uint32 hal_call_isr (cyg_uint32 vector) { cyg_ISR *isr; CYG_ADDRWORD data; cyg_uint32 isr_ret; isr = (cyg_ISR*) hal_interrupt_handlers[vector]; data = hal_interrupt_data[vector]; isr_ret = (*isr) (vector, data); #ifdef CYGFUN_HAL_COMMON_KERNEL_SUPPORT if (isr_ret & CYG_ISR_CALL_DSR) { cyg_interrupt_post_dsr (hal_interrupt_objects[vector]); } #endif return isr_ret & ~CYG_ISR_CALL_DSR; } #else // In chained mode, assume vector 0 points to the chain // handler. Simply call it with the vector number and let it find the // ISR to call - it will also post DSRs as required. static inline cyg_uint32 hal_call_isr (cyg_uint32 vector) { cyg_ISR *isr; CYG_ADDRWORD data; cyg_uint32 isr_ret; isr = (cyg_ISR*) hal_interrupt_handlers[0]; data = hal_interrupt_data[0]; isr_ret = (*isr) (vector, data); return isr_ret; } #endif //----------------------------------------------------------------------------- #endif // CYGONCE_HAL_HAL_ARBITER_H // End of hal_arbiter.h
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