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[/] [or1k/] [trunk/] [rtems-20020807/] [c/] [src/] [lib/] [libbsp/] [i386/] [i386ex/] [startup/] [setvec.c] - Rev 1026
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/* set_vector * * This routine installs an interrupt vector on the Force CPU-386. * * INPUT: * handler - interrupt handler entry point * vector - vector number * type - 0 indicates raw hardware connect * 1 indicates RTEMS interrupt connect * * RETURNS: * address of previous interrupt handler * * COPYRIGHT (c) 1989-1999. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * setvec.c,v 1.6 1999/11/17 17:50:47 joel Exp */ #include <rtems.h> #include <bsp.h> i386_isr_entry set_vector( /* returns old vector */ rtems_isr_entry handler, /* isr routine */ rtems_vector_number vector, /* vector number */ int type /* RTEMS or RAW intr */ ) { i386_isr_entry previous_isr; interrupt_gate_descriptor idt; if ( type ) rtems_interrupt_catch( handler, vector, (rtems_isr_entry *) &previous_isr ); else { /* get the address of the old handler */ idt = Interrupt_descriptor_table[ vector ]; previous_isr = (i386_isr_entry) ((idt.offset_16_31 << 16) | idt.offset_0_15); /* build the IDT entry */ create_interrupt_gate_descriptor( &idt, handler ); /* install the IDT entry */ Interrupt_descriptor_table[ vector ] = idt; } return previous_isr; }
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