132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2002 Xodnizel
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include <signal.h>
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#include <string.h>
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#include <pc.h>
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#include <dpmi.h>
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#include <go32.h>
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#include "keyscan.h"
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static unsigned char lastsc;
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static char keybuf[256];
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int newk;
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/* Read scan code from port $60 */
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/* Acknowledge interrupt( output $20 to port $20) */
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static void ihandler(_go32_dpmi_registers *r)
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{
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unsigned char scode=inp(0x60); /* Get scan code. */
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if(scode!=0xE0)
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{
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int offs=0;
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/* I'm only interested in preserving the independent status of the
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right ALT and CONTROL keys.
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*/
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if(lastsc==0xE0)
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if((scode&0x7F)==SCAN_LEFTALT || (scode&0x7F)==SCAN_LEFTCONTROL)
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offs=0x80;
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keybuf[(scode&0x7f)|offs]=((scode&0x80)^0x80);
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newk++;
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}
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lastsc=scode;
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outp(0x20,0x20); /* Acknowledge interrupt. */
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}
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static _go32_dpmi_seginfo KBIBack,KBIBackRM;
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static _go32_dpmi_seginfo KBI,KBIRM;
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static _go32_dpmi_registers KBIRMRegs;
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static int initdone=0;
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int InitKeyboard(void)
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{
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/* I'll assume that the keyboard is in the correct scancode mode(translated
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mode 2, I think).
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*/
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newk=0;
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memset(keybuf,0,sizeof(keybuf));
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KBIRM.pm_offset=KBI.pm_offset=(int)ihandler;
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KBIRM.pm_selector=KBI.pm_selector=_my_cs();
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_go32_dpmi_get_real_mode_interrupt_vector(9,&KBIBackRM);
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_go32_dpmi_allocate_real_mode_callback_iret(&KBIRM, &KBIRMRegs);
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_go32_dpmi_set_real_mode_interrupt_vector(9,&KBIRM);
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_go32_dpmi_get_protected_mode_interrupt_vector(9,&KBIBack);
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_go32_dpmi_allocate_iret_wrapper(&KBI);
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_go32_dpmi_set_protected_mode_interrupt_vector(9,&KBI);
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lastsc=0;
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initdone=1;
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return(1);
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}
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void KillKeyboard(void)
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{
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if(initdone)
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{
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_go32_dpmi_set_protected_mode_interrupt_vector(9,&KBIBack);
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_go32_dpmi_free_iret_wrapper(&KBI);
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_go32_dpmi_set_real_mode_interrupt_vector(9,&KBIBackRM);
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_go32_dpmi_free_real_mode_callback(&KBIRM);
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initdone=0;
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}
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}
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/* In FCE Ultra, it doesn't matter if the key states change
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in the middle of the keyboard handling code. If you want
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to use this code elsewhere, you may want to memcpy() keybuf
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to another buffer and return that when GetKeyboard() is
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called.
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*/
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char *GetKeyboard(void)
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{
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return keybuf;
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}
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/* Returns 1 on new scan codes generated, 0 on no new scan codes. */
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int UpdateKeyboard(void)
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{
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int t=newk;
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if(t)
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{
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asm volatile(
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"subl %%eax,_newk\n\t"
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:
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: "a" (t)
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);
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if(keybuf[SCAN_LEFTCONTROL] && keybuf[SCAN_C])
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raise(SIGINT);
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return(1);
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}
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return(0);
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}
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