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EPOS

Experimental Protected-mode Operating System

irq.h
/*
EPOS
http://www.atanaslaskov.com/epos/

FILE:          irq.h
DESCRIPTION:   Interrupts services (for use by device drivers)
 
BSD LICENSE
Copyright (c) 2006, Atanas Laskov
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
   1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL ATANAS LASKOV BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


// Some defaults
//
#define ISTATE unsigned char

#define I_ST_OK         0
#define I_ST_IRQLOCKED  1
#define I_ST_IRQFREE    2

#define I_MSG_INTERRUPT    0
#define SY_EVENT_INTERRUPT 0

// Data structures
//
struct IRQ{
    unsigned char bIRQ;
    ISTATE st;
};

typedef struct{
    unsigned char bIRQ;
    void (*irq_handler) (unsigned char nIRQ);
    ISTATE st;
}IRQEX;

// Kernel inernals
//
void k_irqOnSwitch();
void k_irqInit();

// User servuces
//
void irqLock(struct IRQ *p);
void irqLockEx(IRQEX *p);
void irqFree(struct IRQ *p);