os-k/include/ke/idt.h

//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:  Interrupt related functions                                        //
//                                                                            //
//                                                                            //
//  Copyright © 2018-2020 The OS/K Team                                       //
//                                                                            //
//  This file is part of OS/K.                                                //
//                                                                            //
//  OS/K is free software: you can redistribute it and/or modify              //
//  it under the terms of the GNU General Public License as published by      //
//  the Free Software Foundation, either version 3 of the License, or         //
//  any later version.                                                        //
//                                                                            //
//  OS/K is distributed in the hope that it will be useful,                   //
//  but WITHOUT ANY WARRANTY//without even the implied warranty of            //
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             //
//  GNU General Public License for more details.                              //
//                                                                            //
//  You should have received a copy of the GNU General Public License         //
//  along with OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
//----------------------------------------------------------------------------//

#ifndef _KERNEL_H
#include <kernel.h>
#endif

#ifndef _KALKERN_IDT_H
#define _KALKERN_IDT_H

//----------------------------------------------------------------------------//

struct IdtDescriptor_t
{
   ushort limit;
   ulong base;
} __attribute__((packed));

struct IdtEntry_t
{
   ushort baseLow;
   ushort selector;
   uchar ist;
   uchar flags;
   ushort baseMid;
   uint baseHigh;
   uint reserved;
} __attribute__((packed));

struct IdtPtr_t
{
    ushort limit;
    void *base;
} __attribute__((packed));

struct ISRList_t
{
    uchar n; //number of entries in the list

    struct entry {
        void (*isr)(ISRFrame_t *regs);
        uchar isrNo;
        uchar flags;
    } entry[255];
};

//----------------------------------------------------------------------------//

void KeLoadIDT(void);
void KeSetupIDT(void);
void KeUnmaskIRQ(uchar IRQline);
void KeMaskIRQ(uchar IRQline);

void KeSendEOItoPIC(uchar isr);
void KeSetIDTGate(uchar  rank,
                  ulong  base,
                  ushort selector,
                  uchar  flags,
                  uchar  ist);
error_t KeRegisterISR(void (*isr)(ISRFrame_t *regs), uchar isrNo);
void KeBrkDumpRegisters(ISRFrame_t *regs);

//----------------------------------------------------------------------------//

#define _isr0(a,b,c,d,e) \
    void isr##a(); void isr##b(); void isr##c(); void isr##d(); void isr##e()

#define _isr1(a,b,c,d,e,f,g,h,i,j) _isr0(a,b,c,d,e); _isr0(f,g,h,i,j)

_isr1(0,1,2,3,4,5,6,7,8,9);           _isr1(10,11,12,13,14,15,16,17,18,19);
_isr1(20,21,22,23,24,25,26,27,28,29); _isr1(30,31,32,33,34,35,36,37,38,39);
_isr1(40,41,42,43,44,45,46,47,48,49); _isr1(50,51,52,53,54,55,56,57,58,59);

#undef _isr1
#undef _isr0

//----------------------------------------------------------------------------//

#endif