libgloss/sparc_leon/catch_interrupt_mvt.c

/*
 * Copyright (c) 2011 Aeroflex Gaisler
 *
 * BSD license:
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */


#include <asm-leon/leonstack.h>
#include <asm-leon/irq.h>
#define NULL 0


/* multi vector trapping version of trap handler installs */
int
mvtlolevelirqinstall (int irqnr, void (*handler) ())
{
  unsigned long h = (unsigned long) handler;
  unsigned long *addr =
    (unsigned long *) ((locore_readtbr () & ~0xFFF) + 0x100 + (16 * irqnr));

  if (irqnr == 0 || irqnr >= 15)
    {
      return 0;
    }

  addr[0] = ((h >> 10) & 0x3fffff) | 0x29000000;	/* 29000000: sethi   %hi(handler), %l4       */
  addr[1] = ((h) & 0x3ff) | 0x81c52000;	/* 81c52000: jmpl    %l4 + %lo(handler), %g0 */
  addr[2] = 0x01000000;		/* 01000000: nop */
  addr[3] = 0x01000000;		/* 01000000: nop */
  return 1;
}

int
lolevelirqinstall (int irqnr, void (*handler) ())
{
  return mvtlolevelirqinstall (irqnr, handler);
}