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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [hal/] [powerpc/] [arch/] [v2_0/] [src/] [hal_intr.c] - Rev 27
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//========================================================================== // // hal_intr.c // // PowerPC interrupt handlers // //========================================================================== //####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: 1999-02-20 // Purpose: PowerPC interrupt handlers // Description: This file contains code to handle interrupt related issues // on the PowerPC. // //####DESCRIPTIONEND#### // //========================================================================== #include <pkgconf/hal.h> #include <cyg/hal/hal_intr.h> externC void hal_IRQ_init(void) { // No architecture general initialization, but the variant may have // provided some. hal_variant_IRQ_init(); // Initialize real-time clock (for delays, etc, even if kernel doesn't use it) HAL_CLOCK_INITIALIZE(CYGNUM_HAL_RTC_PERIOD); } // Delay for some number of useconds. externC void hal_delay_us(int us) { cyg_int32 old_dec, new_dec; long ticks; int diff; // Note: the system constant CYGNUM_HAL_RTC_PERIOD corresponds to 10,000us // Scale the desired number of microseconds to be a number of decrementer ticks ticks = ((long long)us * (CYGNUM_HAL_RTC_PERIOD * 100)) / 1000000; asm volatile("mfdec %0;" : "=r"(old_dec) : ); while (ticks > 0) { do { asm volatile("mfdec %0;" : "=r"(new_dec) : ); } while (old_dec == new_dec); if (new_dec < 0) { HAL_CLOCK_RESET(0, CYGNUM_HAL_RTC_PERIOD); } diff = (old_dec - new_dec); if (diff < 1) diff = 1; old_dec = new_dec; ticks -= diff; } } // ------------------------------------------------------------------------- // EOF hal_intr.c
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