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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 |