| 1 | /* FCE Ultra - NES/Famicom Emulator\r |
| 2 | *\r |
| 3 | * Copyright notice for this file:\r |
| 4 | * Copyright (C) 2002 Ben Parnell\r |
| 5 | *\r |
| 6 | * This program is free software; you can redistribute it and/or modify\r |
| 7 | * it under the terms of the GNU General Public License as published by\r |
| 8 | * the Free Software Foundation; either version 2 of the License, or\r |
| 9 | * (at your option) any later version.\r |
| 10 | *\r |
| 11 | * This program is distributed in the hope that it will be useful,\r |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of\r |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r |
| 14 | * GNU General Public License for more details.\r |
| 15 | *\r |
| 16 | * You should have received a copy of the GNU General Public License\r |
| 17 | * along with this program; if not, write to the Free Software\r |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA\r |
| 19 | */\r |
| 20 | \r |
| 21 | #include <stdio.h>\r |
| 22 | #include <signal.h>\r |
| 23 | #include <string.h>\r |
| 24 | #include <pc.h>\r |
| 25 | #include <dpmi.h>\r |
| 26 | #include <go32.h>\r |
| 27 | #include "keyscan.h"\r |
| 28 | \r |
| 29 | static unsigned char lastsc;\r |
| 30 | static char keybuf[256];\r |
| 31 | int newk;\r |
| 32 | \r |
| 33 | /* Read scan code from port $60 */\r |
| 34 | /* Acknowledge interrupt( output $20 to port $20) */\r |
| 35 | \r |
| 36 | static void ihandler(_go32_dpmi_registers *r)\r |
| 37 | {\r |
| 38 | unsigned char scode=inp(0x60); /* Get scan code. */\r |
| 39 | \r |
| 40 | \r |
| 41 | if(scode!=0xE0)\r |
| 42 | {\r |
| 43 | int offs=0;\r |
| 44 | \r |
| 45 | /* I'm only interested in preserving the independent status of the\r |
| 46 | right ALT and CONTROL keys.\r |
| 47 | */\r |
| 48 | if(lastsc==0xE0)\r |
| 49 | if((scode&0x7F)==SCAN_LEFTALT || (scode&0x7F)==SCAN_LEFTCONTROL)\r |
| 50 | offs=0x80;\r |
| 51 | \r |
| 52 | \r |
| 53 | keybuf[(scode&0x7f)|offs]=((scode&0x80)^0x80);\r |
| 54 | newk++;\r |
| 55 | }\r |
| 56 | lastsc=scode;\r |
| 57 | \r |
| 58 | outp(0x20,0x20); /* Acknowledge interrupt. */\r |
| 59 | }\r |
| 60 | \r |
| 61 | static _go32_dpmi_seginfo KBIBack,KBIBackRM;\r |
| 62 | static _go32_dpmi_seginfo KBI,KBIRM;\r |
| 63 | static _go32_dpmi_registers KBIRMRegs;\r |
| 64 | static int initdone=0;\r |
| 65 | \r |
| 66 | int InitKeyboard(void)\r |
| 67 | {\r |
| 68 | /* I'll assume that the keyboard is in the correct scancode mode(translated\r |
| 69 | mode 2, I think).\r |
| 70 | */\r |
| 71 | newk=0;\r |
| 72 | memset(keybuf,0,sizeof(keybuf));\r |
| 73 | KBIRM.pm_offset=KBI.pm_offset=(int)ihandler;\r |
| 74 | KBIRM.pm_selector=KBI.pm_selector=_my_cs();\r |
| 75 | \r |
| 76 | _go32_dpmi_get_real_mode_interrupt_vector(9,&KBIBackRM);\r |
| 77 | _go32_dpmi_allocate_real_mode_callback_iret(&KBIRM, &KBIRMRegs);\r |
| 78 | _go32_dpmi_set_real_mode_interrupt_vector(9,&KBIRM);\r |
| 79 | \r |
| 80 | _go32_dpmi_get_protected_mode_interrupt_vector(9,&KBIBack);\r |
| 81 | _go32_dpmi_allocate_iret_wrapper(&KBI);\r |
| 82 | _go32_dpmi_set_protected_mode_interrupt_vector(9,&KBI);\r |
| 83 | lastsc=0;\r |
| 84 | initdone=1;\r |
| 85 | return(1);\r |
| 86 | }\r |
| 87 | \r |
| 88 | void KillKeyboard(void)\r |
| 89 | {\r |
| 90 | if(initdone)\r |
| 91 | {\r |
| 92 | _go32_dpmi_set_protected_mode_interrupt_vector(9,&KBIBack);\r |
| 93 | _go32_dpmi_free_iret_wrapper(&KBI);\r |
| 94 | \r |
| 95 | _go32_dpmi_set_real_mode_interrupt_vector(9,&KBIBackRM);\r |
| 96 | _go32_dpmi_free_real_mode_callback(&KBIRM);\r |
| 97 | initdone=0;\r |
| 98 | }\r |
| 99 | }\r |
| 100 | \r |
| 101 | /* In FCE Ultra, it doesn't matter if the key states change\r |
| 102 | in the middle of the keyboard handling code. If you want\r |
| 103 | to use this code elsewhere, you may want to memcpy() keybuf\r |
| 104 | to another buffer and return that when GetKeyboard() is\r |
| 105 | called.\r |
| 106 | */\r |
| 107 | \r |
| 108 | char *GetKeyboard(void)\r |
| 109 | {\r |
| 110 | return keybuf;\r |
| 111 | }\r |
| 112 | \r |
| 113 | /* Returns 1 on new scan codes generated, 0 on no new scan codes. */\r |
| 114 | int UpdateKeyboard(void)\r |
| 115 | {\r |
| 116 | int t=newk;\r |
| 117 | \r |
| 118 | if(t)\r |
| 119 | {\r |
| 120 | asm volatile(\r |
| 121 | "subl %%eax,_newk\n\t"\r |
| 122 | :\r |
| 123 | : "a" (t)\r |
| 124 | );\r |
| 125 | \r |
| 126 | if(keybuf[SCAN_LEFTCONTROL] && keybuf[SCAN_C])\r |
| 127 | raise(SIGINT);\r |
| 128 | return(1);\r |
| 129 | }\r |
| 130 | return(0);\r |
| 131 | }\r |