source: mainline/kernel/arch/ia32/include/interrupt.h@ 676afa2

/*
 * Copyright (c) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
 */

/** @addtogroup ia32interrupt
 * @{
 */
/** @file
 */

#ifndef KERN_ia32_INTERRUPT_H_
#define KERN_ia32_INTERRUPT_H_

#include <typedefs.h>
#include <arch/pm.h>
#include <trace.h>

#define IVT_ITEMS  IDT_ITEMS
#define IVT_FIRST  0

#define EXC_COUNT  32
#define IRQ_COUNT  16

#define IVT_EXCBASE   0
#define IVT_IRQBASE   (IVT_EXCBASE + EXC_COUNT)
#define IVT_FREEBASE  (IVT_IRQBASE + IRQ_COUNT)

#define IRQ_CLK       0
#define IRQ_KBD       1
#define IRQ_PIC1      2
#define IRQ_PIC_SPUR  7
#define IRQ_MOUSE     12
#define IRQ_DP8390    9

/* This one must have four least significant bits set to ones */
#define VECTOR_APIC_SPUR  (IVT_ITEMS - 1)

#if (((VECTOR_APIC_SPUR + 1) % 16) || VECTOR_APIC_SPUR >= IVT_ITEMS)
#error Wrong definition of VECTOR_APIC_SPUR
#endif

#define VECTOR_DEBUG              1
#define VECTOR_CLK                (IVT_IRQBASE + IRQ_CLK)
#define VECTOR_PIC_SPUR           (IVT_IRQBASE + IRQ_PIC_SPUR)
#define VECTOR_SYSCALL            IVT_FREEBASE
#define VECTOR_TLB_SHOOTDOWN_IPI  (IVT_FREEBASE + 1)
#define VECTOR_DEBUG_IPI          (IVT_FREEBASE + 2)

typedef struct istate {
        /*
         * The strange order of the GPRs is given by the requirement to use the
         * istate structure for both regular interrupts and exceptions as well
         * as for syscall handlers which use this order as an optimization.
         */
        uint32_t edx;
        uint32_t ecx;
        uint32_t ebx;
        uint32_t esi;
        uint32_t edi;
        uint32_t ebp;
        uint32_t eax;
        
        uint32_t ebp_frame;  /* imitation of frame pointer linkage */
        uint32_t eip_frame;  /* imitation of return address linkage */
        
        uint32_t gs;
        uint32_t fs;
        uint32_t es;
        uint32_t ds;
        
        uint32_t error_word;  /* real or fake error word */
        uint32_t eip;
        uint32_t cs;
        uint32_t eflags;
        uint32_t esp;         /* only if istate_t is from uspace */
        uint32_t ss;          /* only if istate_t is from uspace */
} istate_t;

/** Return true if exception happened while in userspace */
NO_TRACE static inline int istate_from_uspace(istate_t *istate)
{
        return !(istate->eip & 0x80000000);
}

NO_TRACE static inline void istate_set_retaddr(istate_t *istate,
    uintptr_t retaddr)
{
        istate->eip = retaddr;
}

NO_TRACE static inline unative_t istate_get_pc(istate_t *istate)
{
        return istate->eip;
}

NO_TRACE static inline unative_t istate_get_fp(istate_t *istate)
{
        return istate->ebp;
}

extern void (* disable_irqs_function)(uint16_t);
extern void (* enable_irqs_function)(uint16_t);
extern void (* eoi_function)(void);

extern void interrupt_init(void);
extern void trap_virtual_enable_irqs(uint16_t);
extern void trap_virtual_disable_irqs(uint16_t);

#endif

/** @}
 */