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skrzyp |
//==========================================================================
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//
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// hal_intr.c
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//
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// PowerPC interrupt handlers
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//
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//==========================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): jskov
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// Contributors: jskov
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// Date: 1999-02-20
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// Purpose: PowerPC interrupt handlers
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// Description: This file contains code to handle interrupt related issues
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// on the PowerPC.
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#include <pkgconf/hal.h>
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#include <cyg/hal/hal_intr.h>
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static unsigned long ticks_per_us;
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externC void
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hal_IRQ_init(void)
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{
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// No architecture general initialization, but the variant may have
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// provided some.
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hal_variant_IRQ_init();
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// Initialize real-time clock (for delays, etc, even if kernel doesn't use it)
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HAL_CLOCK_INITIALIZE(CYGNUM_HAL_RTC_PERIOD);
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// Pre-calculate this factor to avoid the extra calculations on each delay
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ticks_per_us = ((long long)1 * (CYGNUM_HAL_RTC_PERIOD * 100)) / 1000000;
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}
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// Delay for some number of useconds.
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externC void
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hal_delay_us(int us)
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{
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cyg_int32 old_dec, new_dec;
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long ticks;
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int diff;
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// Note: the system constant CYGNUM_HAL_RTC_PERIOD corresponds to 10,000us
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// Scale the desired number of microseconds to be a number of decrementer ticks
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if (ticks_per_us > 0) {
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ticks = us * ticks_per_us;
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} else {
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ticks = ((long long)us * (CYGNUM_HAL_RTC_PERIOD * 100)) / 1000000;
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}
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asm volatile("mfdec %0;" : "=r"(old_dec) : );
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while (ticks > 0) {
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do {
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asm volatile("mfdec %0;" : "=r"(new_dec) : );
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} while (old_dec == new_dec);
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if (new_dec < 0) {
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HAL_CLOCK_RESET(0, CYGNUM_HAL_RTC_PERIOD);
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}
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diff = (old_dec - new_dec);
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if (diff < 1) diff = 1;
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old_dec = new_dec;
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ticks -= diff;
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}
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}
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// -------------------------------------------------------------------------
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// EOF hal_intr.c
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