kernel/interrupt.h

   1 /*
   2  *    Copyright (c) 2008 Joshua Phillips. All rights reserved.
   3  *
   4  *  Redistribution and use in source and binary forms, with or without
   5  *  modification, are permitted provided that the following conditions are
   6  *  met:
   7  *
   8  *    1. Redistributions of source code must retain the above copyright
   9  *       notice, this list of conditions and the following disclaimer.
  10  *    2. Redistributions in binary form must reproduce the above copyright
  11  *       notice, this list of conditions and the following disclaimer in
  12  *       the documentation and/or other materials provided with the
  13  *       distribution.
  14  *
  15  *  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
  16  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  *  DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  19  *  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  21  *  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  22  *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  23  *  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  *  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  25  *  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #ifndef INTERRUPT_H
  29 #define INTERRUPT_H
  30
  31 #include "stdint.h"
  32 #include "cpustruct.h"
  33
  34 // This is the stack structure that arises from an interrupt
  35 struct interrupt_stack {
  36     struct pusha_struct r;
  37     uint32_t error_code, eip, cs, eflags, esp, ss;
  38 };
  39
  40 // Interrupt flags (do not correspond to hardware flags)
  41 enum {
  42     INTR_USER = 0x01,   //user can invoke swi
  43 };
  44
  45 typedef void (* isr_t)(int vector, struct interrupt_stack *);
  46 extern isr_t interrupt_handlers[];
  47
  48 void interrupt_init(void **p_idt);
  49 void enable_interrupts(void); // enable interrupts globally
  50 void disable_interrupts(void); // disable interrupts globally
  51 void set_interrupt(int vector, isr_t handler); // set up an interrupt handler
  52 void clear_interrupt(int vector); // remove an interrupt handler
  53 void interrupt_flags(int vector, unsigned int flags); // set interrupt flags (INTR_*)
  54
  55 int irq_to_int(int irq); // get an interrupt vector of an irq
  56 int int_to_irq(int intn); // get the irq number behind an interrupt vector
  57 void unmask_irq(int n); // unmask (enable) IRQ n
  58 void mask_irq(int n); // mask (disable) IRQ n
  59 void ack_irq(int n); // acknowledge IRQ n
  60
  61 #endif