Commit | Line | Data |
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ada64e4c JW |
1 | /* |
2 | * Kernel Debugger Architecture Dependent Console I/O handler | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. | |
6 | * | |
7 | * Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved. | |
8 | * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved. | |
9 | */ | |
10 | ||
11 | #include <linux/kdb.h> | |
12 | #include <linux/keyboard.h> | |
13 | #include <linux/ctype.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/io.h> | |
16 | ||
17 | /* Keyboard Controller Registers on normal PCs. */ | |
18 | ||
19 | #define KBD_STATUS_REG 0x64 /* Status register (R) */ | |
20 | #define KBD_DATA_REG 0x60 /* Keyboard data register (R/W) */ | |
21 | ||
22 | /* Status Register Bits */ | |
23 | ||
24 | #define KBD_STAT_OBF 0x01 /* Keyboard output buffer full */ | |
25 | #define KBD_STAT_MOUSE_OBF 0x20 /* Mouse output buffer full */ | |
26 | ||
27 | static int kbd_exists; | |
28 | ||
29 | /* | |
30 | * Check if the keyboard controller has a keypress for us. | |
31 | * Some parts (Enter Release, LED change) are still blocking polled here, | |
32 | * but hopefully they are all short. | |
33 | */ | |
34 | int kdb_get_kbd_char(void) | |
35 | { | |
36 | int scancode, scanstatus; | |
37 | static int shift_lock; /* CAPS LOCK state (0-off, 1-on) */ | |
38 | static int shift_key; /* Shift next keypress */ | |
39 | static int ctrl_key; | |
40 | u_short keychar; | |
41 | ||
42 | if (KDB_FLAG(NO_I8042) || KDB_FLAG(NO_VT_CONSOLE) || | |
43 | (inb(KBD_STATUS_REG) == 0xff && inb(KBD_DATA_REG) == 0xff)) { | |
44 | kbd_exists = 0; | |
45 | return -1; | |
46 | } | |
47 | kbd_exists = 1; | |
48 | ||
49 | if ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0) | |
50 | return -1; | |
51 | ||
52 | /* | |
53 | * Fetch the scancode | |
54 | */ | |
55 | scancode = inb(KBD_DATA_REG); | |
56 | scanstatus = inb(KBD_STATUS_REG); | |
57 | ||
58 | /* | |
59 | * Ignore mouse events. | |
60 | */ | |
61 | if (scanstatus & KBD_STAT_MOUSE_OBF) | |
62 | return -1; | |
63 | ||
64 | /* | |
65 | * Ignore release, trigger on make | |
66 | * (except for shift keys, where we want to | |
67 | * keep the shift state so long as the key is | |
68 | * held down). | |
69 | */ | |
70 | ||
71 | if (((scancode&0x7f) == 0x2a) || ((scancode&0x7f) == 0x36)) { | |
72 | /* | |
73 | * Next key may use shift table | |
74 | */ | |
75 | if ((scancode & 0x80) == 0) | |
76 | shift_key = 1; | |
77 | else | |
78 | shift_key = 0; | |
79 | return -1; | |
80 | } | |
81 | ||
82 | if ((scancode&0x7f) == 0x1d) { | |
83 | /* | |
84 | * Left ctrl key | |
85 | */ | |
86 | if ((scancode & 0x80) == 0) | |
87 | ctrl_key = 1; | |
88 | else | |
89 | ctrl_key = 0; | |
90 | return -1; | |
91 | } | |
92 | ||
93 | if ((scancode & 0x80) != 0) | |
94 | return -1; | |
95 | ||
96 | scancode &= 0x7f; | |
97 | ||
98 | /* | |
99 | * Translate scancode | |
100 | */ | |
101 | ||
102 | if (scancode == 0x3a) { | |
103 | /* | |
104 | * Toggle caps lock | |
105 | */ | |
106 | shift_lock ^= 1; | |
107 | ||
108 | #ifdef KDB_BLINK_LED | |
109 | kdb_toggleled(0x4); | |
110 | #endif | |
111 | return -1; | |
112 | } | |
113 | ||
114 | if (scancode == 0x0e) { | |
115 | /* | |
116 | * Backspace | |
117 | */ | |
118 | return 8; | |
119 | } | |
120 | ||
121 | /* Special Key */ | |
122 | switch (scancode) { | |
123 | case 0xF: /* Tab */ | |
124 | return 9; | |
125 | case 0x53: /* Del */ | |
126 | return 4; | |
127 | case 0x47: /* Home */ | |
128 | return 1; | |
129 | case 0x4F: /* End */ | |
130 | return 5; | |
131 | case 0x4B: /* Left */ | |
132 | return 2; | |
133 | case 0x48: /* Up */ | |
134 | return 16; | |
135 | case 0x50: /* Down */ | |
136 | return 14; | |
137 | case 0x4D: /* Right */ | |
138 | return 6; | |
139 | } | |
140 | ||
141 | if (scancode == 0xe0) | |
142 | return -1; | |
143 | ||
144 | /* | |
145 | * For Japanese 86/106 keyboards | |
146 | * See comment in drivers/char/pc_keyb.c. | |
147 | * - Masahiro Adegawa | |
148 | */ | |
149 | if (scancode == 0x73) | |
150 | scancode = 0x59; | |
151 | else if (scancode == 0x7d) | |
152 | scancode = 0x7c; | |
153 | ||
154 | if (!shift_lock && !shift_key && !ctrl_key) { | |
155 | keychar = plain_map[scancode]; | |
156 | } else if ((shift_lock || shift_key) && key_maps[1]) { | |
157 | keychar = key_maps[1][scancode]; | |
158 | } else if (ctrl_key && key_maps[4]) { | |
159 | keychar = key_maps[4][scancode]; | |
160 | } else { | |
161 | keychar = 0x0020; | |
162 | kdb_printf("Unknown state/scancode (%d)\n", scancode); | |
163 | } | |
164 | keychar &= 0x0fff; | |
165 | if (keychar == '\t') | |
166 | keychar = ' '; | |
167 | switch (KTYP(keychar)) { | |
168 | case KT_LETTER: | |
169 | case KT_LATIN: | |
170 | if (isprint(keychar)) | |
171 | break; /* printable characters */ | |
172 | /* drop through */ | |
173 | case KT_SPEC: | |
174 | if (keychar == K_ENTER) | |
175 | break; | |
176 | /* drop through */ | |
177 | default: | |
178 | return -1; /* ignore unprintables */ | |
179 | } | |
180 | ||
181 | if ((scancode & 0x7f) == 0x1c) { | |
182 | /* | |
183 | * enter key. All done. Absorb the release scancode. | |
184 | */ | |
185 | while ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0) | |
186 | ; | |
187 | ||
188 | /* | |
189 | * Fetch the scancode | |
190 | */ | |
191 | scancode = inb(KBD_DATA_REG); | |
192 | scanstatus = inb(KBD_STATUS_REG); | |
193 | ||
194 | while (scanstatus & KBD_STAT_MOUSE_OBF) { | |
195 | scancode = inb(KBD_DATA_REG); | |
196 | scanstatus = inb(KBD_STATUS_REG); | |
197 | } | |
198 | ||
199 | if (scancode != 0x9c) { | |
200 | /* | |
201 | * Wasn't an enter-release, why not? | |
202 | */ | |
203 | kdb_printf("kdb: expected enter got 0x%x status 0x%x\n", | |
204 | scancode, scanstatus); | |
205 | } | |
206 | ||
207 | return 13; | |
208 | } | |
209 | ||
210 | return keychar & 0xff; | |
211 | } | |
212 | EXPORT_SYMBOL_GPL(kdb_get_kbd_char); |