613f809f5d
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@60 42af7a65-404d-4744-a932-0658087f49c3
150 lines
4.3 KiB
C
150 lines
4.3 KiB
C
/************************************************************
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* up_irq.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************/
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/************************************************************
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* Included Files
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************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <nuttx/irq.h>
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#include <8052.h>
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#include "up_internal.h"
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#include <debug.h>
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extern int g_nints;
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/************************************************************
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* Definitions
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************************************************************/
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/************************************************************
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* Public Data
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************************************************************/
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/************************************************************
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* Private Data
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************************************************************/
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/************************************************************
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* Private Functions
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************************************************************/
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/************************************************************
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* Public Funtions
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************************************************************/
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/************************************************************
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* Name: irq_initialize
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************************************************************/
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void up_irqinitialize(void)
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{
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/* Set interrupt priorities (all low) */
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IP = 0;
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#ifdef CONFIG_SUPPRESS_INTERRUPTS
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/* Disable all interrupts */
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IE = 0;
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#else
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/* Enable interrupts globally, but disable all interrupt
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* sources.
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*/
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IE = 0x80;
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#endif
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}
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/************************************************************
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* Name: irqsave
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*
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* Description:
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* Disable all IRQs
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*
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************************************************************/
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irqstate_t irqsave(void)
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{
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irqstate_t ret = IE;
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EA = 0;
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return ret;
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}
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/************************************************************
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* Name: irqrestore
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*
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* Description:
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* Restore a previous interrupt state
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*
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************************************************************/
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void irqrestore(irqstate_t flags)
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{
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IE = flags;
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}
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/************************************************************
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* Name: up_disable_irq
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*
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* Description:
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* Disable the IRQ specified by 'irq'
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*
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************************************************************/
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void up_disable_irq(int irq)
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{
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if ((unsigned)irq < NR_IRQS)
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{
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IE &= ~(g_ntobit[irq]);
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}
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}
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/************************************************************
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* Name: up_enable_irq
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*
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* Description:
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* Enable the IRQ specified by 'irq'
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*
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************************************************************/
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void up_enable_irq(int irq)
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{
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if ((unsigned)irq < NR_IRQS)
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{
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IE |= g_ntobit[irq];
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}
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}
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