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> | |
ada64e4c JW |
14 | #include <linux/io.h> |
15 | ||
16 | /* Keyboard Controller Registers on normal PCs. */ | |
17 | ||
18 | #define KBD_STATUS_REG 0x64 /* Status register (R) */ | |
19 | #define KBD_DATA_REG 0x60 /* Keyboard data register (R/W) */ | |
20 | ||
21 | /* Status Register Bits */ | |
22 | ||
23 | #define KBD_STAT_OBF 0x01 /* Keyboard output buffer full */ | |
24 | #define KBD_STAT_MOUSE_OBF 0x20 /* Mouse output buffer full */ | |
25 | ||
26 | static int kbd_exists; | |
8f30d411 | 27 | static int kbd_last_ret; |
ada64e4c JW |
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 | ||
8f30d411 AW |
93 | if ((scancode & 0x80) != 0) { |
94 | if (scancode == 0x9c) | |
95 | kbd_last_ret = 0; | |
ada64e4c | 96 | return -1; |
8f30d411 | 97 | } |
ada64e4c JW |
98 | |
99 | scancode &= 0x7f; | |
100 | ||
101 | /* | |
102 | * Translate scancode | |
103 | */ | |
104 | ||
105 | if (scancode == 0x3a) { | |
106 | /* | |
107 | * Toggle caps lock | |
108 | */ | |
109 | shift_lock ^= 1; | |
110 | ||
111 | #ifdef KDB_BLINK_LED | |
112 | kdb_toggleled(0x4); | |
113 | #endif | |
114 | return -1; | |
115 | } | |
116 | ||
117 | if (scancode == 0x0e) { | |
118 | /* | |
119 | * Backspace | |
120 | */ | |
121 | return 8; | |
122 | } | |
123 | ||
124 | /* Special Key */ | |
125 | switch (scancode) { | |
126 | case 0xF: /* Tab */ | |
127 | return 9; | |
128 | case 0x53: /* Del */ | |
129 | return 4; | |
130 | case 0x47: /* Home */ | |
131 | return 1; | |
132 | case 0x4F: /* End */ | |
133 | return 5; | |
134 | case 0x4B: /* Left */ | |
135 | return 2; | |
136 | case 0x48: /* Up */ | |
137 | return 16; | |
138 | case 0x50: /* Down */ | |
139 | return 14; | |
140 | case 0x4D: /* Right */ | |
141 | return 6; | |
142 | } | |
143 | ||
144 | if (scancode == 0xe0) | |
145 | return -1; | |
146 | ||
147 | /* | |
148 | * For Japanese 86/106 keyboards | |
149 | * See comment in drivers/char/pc_keyb.c. | |
150 | * - Masahiro Adegawa | |
151 | */ | |
152 | if (scancode == 0x73) | |
153 | scancode = 0x59; | |
154 | else if (scancode == 0x7d) | |
155 | scancode = 0x7c; | |
156 | ||
157 | if (!shift_lock && !shift_key && !ctrl_key) { | |
158 | keychar = plain_map[scancode]; | |
159 | } else if ((shift_lock || shift_key) && key_maps[1]) { | |
160 | keychar = key_maps[1][scancode]; | |
161 | } else if (ctrl_key && key_maps[4]) { | |
162 | keychar = key_maps[4][scancode]; | |
163 | } else { | |
164 | keychar = 0x0020; | |
165 | kdb_printf("Unknown state/scancode (%d)\n", scancode); | |
166 | } | |
167 | keychar &= 0x0fff; | |
168 | if (keychar == '\t') | |
169 | keychar = ' '; | |
170 | switch (KTYP(keychar)) { | |
171 | case KT_LETTER: | |
172 | case KT_LATIN: | |
173 | if (isprint(keychar)) | |
174 | break; /* printable characters */ | |
df561f66 | 175 | fallthrough; |
ada64e4c JW |
176 | case KT_SPEC: |
177 | if (keychar == K_ENTER) | |
178 | break; | |
df561f66 | 179 | fallthrough; |
ada64e4c JW |
180 | default: |
181 | return -1; /* ignore unprintables */ | |
182 | } | |
183 | ||
8f30d411 AW |
184 | if (scancode == 0x1c) { |
185 | kbd_last_ret = 1; | |
186 | return 13; | |
187 | } | |
188 | ||
189 | return keychar & 0xff; | |
190 | } | |
191 | EXPORT_SYMBOL_GPL(kdb_get_kbd_char); | |
192 | ||
193 | /* | |
194 | * Best effort cleanup of ENTER break codes on leaving KDB. Called on | |
195 | * exiting KDB, when we know we processed an ENTER or KP ENTER scan | |
196 | * code. | |
197 | */ | |
198 | void kdb_kbd_cleanup_state(void) | |
199 | { | |
200 | int scancode, scanstatus; | |
201 | ||
202 | /* | |
203 | * Nothing to clean up, since either | |
204 | * ENTER was never pressed, or has already | |
205 | * gotten cleaned up. | |
206 | */ | |
207 | if (!kbd_last_ret) | |
208 | return; | |
209 | ||
210 | kbd_last_ret = 0; | |
211 | /* | |
212 | * Enter key. Need to absorb the break code here, lest it gets | |
213 | * leaked out if we exit KDB as the result of processing 'g'. | |
214 | * | |
215 | * This has several interesting implications: | |
216 | * + Need to handle KP ENTER, which has break code 0xe0 0x9c. | |
217 | * + Need to handle repeat ENTER and repeat KP ENTER. Repeats | |
218 | * only get a break code at the end of the repeated | |
219 | * sequence. This means we can't propagate the repeated key | |
220 | * press, and must swallow it away. | |
221 | * + Need to handle possible PS/2 mouse input. | |
222 | * + Need to handle mashed keys. | |
223 | */ | |
224 | ||
225 | while (1) { | |
ada64e4c | 226 | while ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0) |
8f30d411 | 227 | cpu_relax(); |
ada64e4c JW |
228 | |
229 | /* | |
8f30d411 | 230 | * Fetch the scancode. |
ada64e4c JW |
231 | */ |
232 | scancode = inb(KBD_DATA_REG); | |
233 | scanstatus = inb(KBD_STATUS_REG); | |
234 | ||
8f30d411 AW |
235 | /* |
236 | * Skip mouse input. | |
237 | */ | |
238 | if (scanstatus & KBD_STAT_MOUSE_OBF) | |
239 | continue; | |
ada64e4c | 240 | |
8f30d411 AW |
241 | /* |
242 | * If we see 0xe0, this is either a break code for KP | |
243 | * ENTER, or a repeat make for KP ENTER. Either way, | |
244 | * since the second byte is equivalent to an ENTER, | |
245 | * skip the 0xe0 and try again. | |
246 | * | |
247 | * If we see 0x1c, this must be a repeat ENTER or KP | |
248 | * ENTER (and we swallowed 0xe0 before). Try again. | |
249 | * | |
250 | * We can also see make and break codes for other keys | |
251 | * mashed before or after pressing ENTER. Thus, if we | |
252 | * see anything other than 0x9c, we have to try again. | |
253 | * | |
254 | * Note, if you held some key as ENTER was depressed, | |
255 | * that break code would get leaked out. | |
256 | */ | |
257 | if (scancode != 0x9c) | |
258 | continue; | |
ada64e4c | 259 | |
8f30d411 | 260 | return; |
ada64e4c | 261 | } |
ada64e4c | 262 | } |