catch_interrupt.c

来自「这是leon3处理器的交叉编译链」· C语言 代码 · 共 102 行

/*

    LEON2/3 LIBIO low-level routines 
    Written by Jiri Gaisler.
    Copyright (C) 2004  Gaisler Research AB

    This program 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 of the License, or
    (at your option) any later version.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

#include <asm-leon/leonstack.h>
#include <asm-leon/irq.h>
#define NULL 0
struct irqaction *_irqtbl[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
struct irqaction _oirqtbl[16] = { INIT_IRQACTION,INIT_IRQACTION,INIT_IRQACTION,INIT_IRQACTION,
				  INIT_IRQACTION,INIT_IRQACTION,INIT_IRQACTION,INIT_IRQACTION,
				  INIT_IRQACTION,INIT_IRQACTION,INIT_IRQACTION,INIT_IRQACTION,
				  INIT_IRQACTION,INIT_IRQACTION,INIT_IRQACTION,INIT_IRQACTION };

int catch_interrupt (int func, int irq) {
  struct irqaction *a = _irqtbl[irq];
  struct irqaction *n = &_oirqtbl[irq];
  while (a) {
    if (a == n) {
      int tmp = (int) a->handler;
      a->handler = (irqhandler)func;
      return tmp;
    }
    a = a ->next;
  }
  n->handler = (irqhandler)func;
  chained_catch_interrupt(irq,n);
  return 0;
}

void chained_catch_interrupt (int irq, struct irqaction *a ) {
  a ->next = _irqtbl[irq];
  _irqtbl[irq] = a;
}

int inirq = 0;
handler_irq (int irq, struct leonbare_pt_regs *pt_regs) { 
  struct irqaction *a = _irqtbl[irq];
  while (a) {
    if (a->handler) {
#ifndef CONFIG_LEONBARE_NONESTEDIRQ
      if (!inirq) {
#endif      
	inirq = 1;
	a->handler(irq, a->dev_id, pt_regs);
	inirq = 0;
#ifndef CONFIG_LEONBARE_NONESTEDIRQ
      }
#endif      
    }
    a = a ->next;
  }
}

schedulehandler schedule_callback = 0;

// '''''''''''''''''''''''''''''''''''''''''''''''''''''

TAILQ_HEAD(pending_queue,pendingaction) pending = TAILQ_HEAD_INITIALIZER(pending); 

void add_pending(struct pendingaction *a) {
  unsigned long old = leonbare_disable_traps();
  TAILQ_INSERT_TAIL(&pending,a,next);
  leonbare_enable_traps(old);
}

struct pendingaction *get_pending() {
  struct pendingaction *a = 0;
  unsigned long old = leonbare_disable_traps();
  if (a = TAILQ_FIRST(&pending)) {
    TAILQ_REMOVE(&pending,a,next);
  }
  leonbare_enable_traps(old);
  return a;
}

void process_pending() {
  struct pendingaction *a;
  while(a = get_pending()) {
    if (a->handler) {
      a->handler(a->arg);
    }
  }
}