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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * consolemap.c
4 *
5 * Mapping from internal code (such as Latin-1 or Unicode or IBM PC code)
6 * to font positions.
7 *
8 * aeb, 950210
9 *
10 * Support for multiple unimaps by Jakub Jelinek <jj@ultra.linux.cz>, July 1998
11 *
12 * Fix bug in inverse translation. Stanislav Voronyi <stas@cnti.uanet.kharkov.ua>, Dec 1998
13 *
14 * In order to prevent the following circular lock dependency:
15 * &mm->mmap_lock --> cpu_hotplug.lock --> console_lock --> &mm->mmap_lock
16 *
17 * We cannot allow page fault to happen while holding the console_lock.
18 * Therefore, all the userspace copy operations have to be done outside
19 * the console_lock critical sections.
20 *
21 * As all the affected functions are all called directly from vt_ioctl(), we
22 * can allocate some small buffers directly on stack without worrying about
23 * stack overflow.
24 */
25
26#include <linux/module.h>
27#include <linux/kd.h>
28#include <linux/errno.h>
29#include <linux/mm.h>
30#include <linux/slab.h>
31#include <linux/init.h>
32#include <linux/tty.h>
33#include <linux/uaccess.h>
34#include <linux/console.h>
35#include <linux/consolemap.h>
36#include <linux/vt_kern.h>
37#include <linux/string.h>
38
39static unsigned short translations[][256] = {
40 /* 8-bit Latin-1 mapped to Unicode -- trivial mapping */
41 {
42 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
43 0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
44 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
45 0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
46 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
47 0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
48 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
49 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
50 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
51 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
52 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
53 0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
54 0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
55 0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
56 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
57 0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x007f,
58 0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
59 0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
60 0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
61 0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
62 0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
63 0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
64 0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
65 0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
66 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
67 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
68 0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
69 0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
70 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
71 0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
72 0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
73 0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
74 },
75 /* VT100 graphics mapped to Unicode */
76 {
77 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
78 0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
79 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
80 0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
81 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
82 0x0028, 0x0029, 0x002a, 0x2192, 0x2190, 0x2191, 0x2193, 0x002f,
83 0x2588, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
84 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
85 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
86 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
87 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
88 0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x00a0,
89 0x25c6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1,
90 0x2591, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba,
91 0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c,
92 0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7, 0x007f,
93 0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
94 0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
95 0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
96 0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
97 0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
98 0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
99 0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
100 0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
101 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
102 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
103 0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
104 0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
105 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
106 0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
107 0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
108 0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
109 },
110 /* IBM Codepage 437 mapped to Unicode */
111 {
112 0x0000, 0x263a, 0x263b, 0x2665, 0x2666, 0x2663, 0x2660, 0x2022,
113 0x25d8, 0x25cb, 0x25d9, 0x2642, 0x2640, 0x266a, 0x266b, 0x263c,
114 0x25b6, 0x25c0, 0x2195, 0x203c, 0x00b6, 0x00a7, 0x25ac, 0x21a8,
115 0x2191, 0x2193, 0x2192, 0x2190, 0x221f, 0x2194, 0x25b2, 0x25bc,
116 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
117 0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
118 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
119 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
120 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
121 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
122 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
123 0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
124 0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
125 0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
126 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
127 0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x2302,
128 0x00c7, 0x00fc, 0x00e9, 0x00e2, 0x00e4, 0x00e0, 0x00e5, 0x00e7,
129 0x00ea, 0x00eb, 0x00e8, 0x00ef, 0x00ee, 0x00ec, 0x00c4, 0x00c5,
130 0x00c9, 0x00e6, 0x00c6, 0x00f4, 0x00f6, 0x00f2, 0x00fb, 0x00f9,
131 0x00ff, 0x00d6, 0x00dc, 0x00a2, 0x00a3, 0x00a5, 0x20a7, 0x0192,
132 0x00e1, 0x00ed, 0x00f3, 0x00fa, 0x00f1, 0x00d1, 0x00aa, 0x00ba,
133 0x00bf, 0x2310, 0x00ac, 0x00bd, 0x00bc, 0x00a1, 0x00ab, 0x00bb,
134 0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556,
135 0x2555, 0x2563, 0x2551, 0x2557, 0x255d, 0x255c, 0x255b, 0x2510,
136 0x2514, 0x2534, 0x252c, 0x251c, 0x2500, 0x253c, 0x255e, 0x255f,
137 0x255a, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256c, 0x2567,
138 0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256b,
139 0x256a, 0x2518, 0x250c, 0x2588, 0x2584, 0x258c, 0x2590, 0x2580,
140 0x03b1, 0x00df, 0x0393, 0x03c0, 0x03a3, 0x03c3, 0x00b5, 0x03c4,
141 0x03a6, 0x0398, 0x03a9, 0x03b4, 0x221e, 0x03c6, 0x03b5, 0x2229,
142 0x2261, 0x00b1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00f7, 0x2248,
143 0x00b0, 0x2219, 0x00b7, 0x221a, 0x207f, 0x00b2, 0x25a0, 0x00a0
144 },
145 /* User mapping -- default to codes for direct font mapping */
146 {
147 0xf000, 0xf001, 0xf002, 0xf003, 0xf004, 0xf005, 0xf006, 0xf007,
148 0xf008, 0xf009, 0xf00a, 0xf00b, 0xf00c, 0xf00d, 0xf00e, 0xf00f,
149 0xf010, 0xf011, 0xf012, 0xf013, 0xf014, 0xf015, 0xf016, 0xf017,
150 0xf018, 0xf019, 0xf01a, 0xf01b, 0xf01c, 0xf01d, 0xf01e, 0xf01f,
151 0xf020, 0xf021, 0xf022, 0xf023, 0xf024, 0xf025, 0xf026, 0xf027,
152 0xf028, 0xf029, 0xf02a, 0xf02b, 0xf02c, 0xf02d, 0xf02e, 0xf02f,
153 0xf030, 0xf031, 0xf032, 0xf033, 0xf034, 0xf035, 0xf036, 0xf037,
154 0xf038, 0xf039, 0xf03a, 0xf03b, 0xf03c, 0xf03d, 0xf03e, 0xf03f,
155 0xf040, 0xf041, 0xf042, 0xf043, 0xf044, 0xf045, 0xf046, 0xf047,
156 0xf048, 0xf049, 0xf04a, 0xf04b, 0xf04c, 0xf04d, 0xf04e, 0xf04f,
157 0xf050, 0xf051, 0xf052, 0xf053, 0xf054, 0xf055, 0xf056, 0xf057,
158 0xf058, 0xf059, 0xf05a, 0xf05b, 0xf05c, 0xf05d, 0xf05e, 0xf05f,
159 0xf060, 0xf061, 0xf062, 0xf063, 0xf064, 0xf065, 0xf066, 0xf067,
160 0xf068, 0xf069, 0xf06a, 0xf06b, 0xf06c, 0xf06d, 0xf06e, 0xf06f,
161 0xf070, 0xf071, 0xf072, 0xf073, 0xf074, 0xf075, 0xf076, 0xf077,
162 0xf078, 0xf079, 0xf07a, 0xf07b, 0xf07c, 0xf07d, 0xf07e, 0xf07f,
163 0xf080, 0xf081, 0xf082, 0xf083, 0xf084, 0xf085, 0xf086, 0xf087,
164 0xf088, 0xf089, 0xf08a, 0xf08b, 0xf08c, 0xf08d, 0xf08e, 0xf08f,
165 0xf090, 0xf091, 0xf092, 0xf093, 0xf094, 0xf095, 0xf096, 0xf097,
166 0xf098, 0xf099, 0xf09a, 0xf09b, 0xf09c, 0xf09d, 0xf09e, 0xf09f,
167 0xf0a0, 0xf0a1, 0xf0a2, 0xf0a3, 0xf0a4, 0xf0a5, 0xf0a6, 0xf0a7,
168 0xf0a8, 0xf0a9, 0xf0aa, 0xf0ab, 0xf0ac, 0xf0ad, 0xf0ae, 0xf0af,
169 0xf0b0, 0xf0b1, 0xf0b2, 0xf0b3, 0xf0b4, 0xf0b5, 0xf0b6, 0xf0b7,
170 0xf0b8, 0xf0b9, 0xf0ba, 0xf0bb, 0xf0bc, 0xf0bd, 0xf0be, 0xf0bf,
171 0xf0c0, 0xf0c1, 0xf0c2, 0xf0c3, 0xf0c4, 0xf0c5, 0xf0c6, 0xf0c7,
172 0xf0c8, 0xf0c9, 0xf0ca, 0xf0cb, 0xf0cc, 0xf0cd, 0xf0ce, 0xf0cf,
173 0xf0d0, 0xf0d1, 0xf0d2, 0xf0d3, 0xf0d4, 0xf0d5, 0xf0d6, 0xf0d7,
174 0xf0d8, 0xf0d9, 0xf0da, 0xf0db, 0xf0dc, 0xf0dd, 0xf0de, 0xf0df,
175 0xf0e0, 0xf0e1, 0xf0e2, 0xf0e3, 0xf0e4, 0xf0e5, 0xf0e6, 0xf0e7,
176 0xf0e8, 0xf0e9, 0xf0ea, 0xf0eb, 0xf0ec, 0xf0ed, 0xf0ee, 0xf0ef,
177 0xf0f0, 0xf0f1, 0xf0f2, 0xf0f3, 0xf0f4, 0xf0f5, 0xf0f6, 0xf0f7,
178 0xf0f8, 0xf0f9, 0xf0fa, 0xf0fb, 0xf0fc, 0xf0fd, 0xf0fe, 0xf0ff
179 }
180};
181
182/* The standard kernel character-to-font mappings are not invertible
183 -- this is just a best effort. */
184
185#define MAX_GLYPH 512 /* Max possible glyph value */
186
187static int inv_translate[MAX_NR_CONSOLES];
188
189struct uni_pagedir {
190 u16 **uni_pgdir[32];
191 unsigned long refcount;
192 unsigned long sum;
193 unsigned char *inverse_translations[4];
194 u16 *inverse_trans_unicode;
195};
196
197static struct uni_pagedir *dflt;
198
199static void set_inverse_transl(struct vc_data *conp, struct uni_pagedir *p, int i)
200{
201 int j, glyph;
202 unsigned short *t = translations[i];
203 unsigned char *q;
204
205 if (!p) return;
206 q = p->inverse_translations[i];
207
208 if (!q) {
209 q = p->inverse_translations[i] = kmalloc(MAX_GLYPH, GFP_KERNEL);
210 if (!q) return;
211 }
212 memset(q, 0, MAX_GLYPH);
213
214 for (j = 0; j < E_TABSZ; j++) {
215 glyph = conv_uni_to_pc(conp, t[j]);
216 if (glyph >= 0 && glyph < MAX_GLYPH && q[glyph] < 32) {
217 /* prefer '-' above SHY etc. */
218 q[glyph] = j;
219 }
220 }
221}
222
223static void set_inverse_trans_unicode(struct vc_data *conp,
224 struct uni_pagedir *p)
225{
226 int i, j, k, glyph;
227 u16 **p1, *p2;
228 u16 *q;
229
230 if (!p) return;
231 q = p->inverse_trans_unicode;
232 if (!q) {
233 q = p->inverse_trans_unicode =
234 kmalloc_array(MAX_GLYPH, sizeof(u16), GFP_KERNEL);
235 if (!q)
236 return;
237 }
238 memset(q, 0, MAX_GLYPH * sizeof(u16));
239
240 for (i = 0; i < 32; i++) {
241 p1 = p->uni_pgdir[i];
242 if (!p1)
243 continue;
244 for (j = 0; j < 32; j++) {
245 p2 = p1[j];
246 if (!p2)
247 continue;
248 for (k = 0; k < 64; k++) {
249 glyph = p2[k];
250 if (glyph >= 0 && glyph < MAX_GLYPH
251 && q[glyph] < 32)
252 q[glyph] = (i << 11) + (j << 6) + k;
253 }
254 }
255 }
256}
257
258unsigned short *set_translate(int m, struct vc_data *vc)
259{
260 inv_translate[vc->vc_num] = m;
261 return translations[m];
262}
263
264/*
265 * Inverse translation is impossible for several reasons:
266 * 1. The font<->character maps are not 1-1.
267 * 2. The text may have been written while a different translation map
268 * was active.
269 * Still, it is now possible to a certain extent to cut and paste non-ASCII.
270 */
271u16 inverse_translate(struct vc_data *conp, int glyph, int use_unicode)
272{
273 struct uni_pagedir *p;
274 int m;
275 if (glyph < 0 || glyph >= MAX_GLYPH)
276 return 0;
277 else {
278 p = *conp->vc_uni_pagedir_loc;
279 if (!p)
280 return glyph;
281 else if (use_unicode) {
282 if (!p->inverse_trans_unicode)
283 return glyph;
284 else
285 return p->inverse_trans_unicode[glyph];
286 } else {
287 m = inv_translate[conp->vc_num];
288 if (!p->inverse_translations[m])
289 return glyph;
290 else
291 return p->inverse_translations[m][glyph];
292 }
293 }
294}
295EXPORT_SYMBOL_GPL(inverse_translate);
296
297static void update_user_maps(void)
298{
299 int i;
300 struct uni_pagedir *p, *q = NULL;
301
302 for (i = 0; i < MAX_NR_CONSOLES; i++) {
303 if (!vc_cons_allocated(i))
304 continue;
305 p = *vc_cons[i].d->vc_uni_pagedir_loc;
306 if (p && p != q) {
307 set_inverse_transl(vc_cons[i].d, p, USER_MAP);
308 set_inverse_trans_unicode(vc_cons[i].d, p);
309 q = p;
310 }
311 }
312}
313
314/*
315 * Load customizable translation table
316 * arg points to a 256 byte translation table.
317 *
318 * The "old" variants are for translation directly to font (using the
319 * 0xf000-0xf0ff "transparent" Unicodes) whereas the "new" variants set
320 * Unicodes explicitly.
321 */
322int con_set_trans_old(unsigned char __user * arg)
323{
324 int i;
325 unsigned short inbuf[E_TABSZ];
326 unsigned char ubuf[E_TABSZ];
327
328 if (copy_from_user(ubuf, arg, E_TABSZ))
329 return -EFAULT;
330
331 for (i = 0; i < E_TABSZ ; i++)
332 inbuf[i] = UNI_DIRECT_BASE | ubuf[i];
333
334 console_lock();
335 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
336 update_user_maps();
337 console_unlock();
338 return 0;
339}
340
341int con_get_trans_old(unsigned char __user * arg)
342{
343 int i, ch;
344 unsigned short *p = translations[USER_MAP];
345 unsigned char outbuf[E_TABSZ];
346
347 console_lock();
348 for (i = 0; i < E_TABSZ ; i++)
349 {
350 ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]);
351 outbuf[i] = (ch & ~0xff) ? 0 : ch;
352 }
353 console_unlock();
354
355 return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0;
356}
357
358int con_set_trans_new(ushort __user * arg)
359{
360 unsigned short inbuf[E_TABSZ];
361
362 if (copy_from_user(inbuf, arg, sizeof(inbuf)))
363 return -EFAULT;
364
365 console_lock();
366 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
367 update_user_maps();
368 console_unlock();
369 return 0;
370}
371
372int con_get_trans_new(ushort __user * arg)
373{
374 unsigned short outbuf[E_TABSZ];
375
376 console_lock();
377 memcpy(outbuf, translations[USER_MAP], sizeof(outbuf));
378 console_unlock();
379
380 return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0;
381}
382
383/*
384 * Unicode -> current font conversion
385 *
386 * A font has at most 512 chars, usually 256.
387 * But one font position may represent several Unicode chars.
388 * A hashtable is somewhat of a pain to deal with, so use a
389 * "paged table" instead. Simulation has shown the memory cost of
390 * this 3-level paged table scheme to be comparable to a hash table.
391 */
392
393extern u8 dfont_unicount[]; /* Defined in console_defmap.c */
394extern u16 dfont_unitable[];
395
396static void con_release_unimap(struct uni_pagedir *p)
397{
398 u16 **p1;
399 int i, j;
400
401 if (p == dflt) dflt = NULL;
402 for (i = 0; i < 32; i++) {
403 p1 = p->uni_pgdir[i];
404 if (p1 != NULL) {
405 for (j = 0; j < 32; j++)
406 kfree(p1[j]);
407 kfree(p1);
408 }
409 p->uni_pgdir[i] = NULL;
410 }
411 for (i = 0; i < 4; i++) {
412 kfree(p->inverse_translations[i]);
413 p->inverse_translations[i] = NULL;
414 }
415 kfree(p->inverse_trans_unicode);
416 p->inverse_trans_unicode = NULL;
417}
418
419/* Caller must hold the console lock */
420void con_free_unimap(struct vc_data *vc)
421{
422 struct uni_pagedir *p;
423
424 p = *vc->vc_uni_pagedir_loc;
425 if (!p)
426 return;
427 *vc->vc_uni_pagedir_loc = NULL;
428 if (--p->refcount)
429 return;
430 con_release_unimap(p);
431 kfree(p);
432}
433
434static int con_unify_unimap(struct vc_data *conp, struct uni_pagedir *p)
435{
436 int i, j, k;
437 struct uni_pagedir *q;
438
439 for (i = 0; i < MAX_NR_CONSOLES; i++) {
440 if (!vc_cons_allocated(i))
441 continue;
442 q = *vc_cons[i].d->vc_uni_pagedir_loc;
443 if (!q || q == p || q->sum != p->sum)
444 continue;
445 for (j = 0; j < 32; j++) {
446 u16 **p1, **q1;
447 p1 = p->uni_pgdir[j]; q1 = q->uni_pgdir[j];
448 if (!p1 && !q1)
449 continue;
450 if (!p1 || !q1)
451 break;
452 for (k = 0; k < 32; k++) {
453 if (!p1[k] && !q1[k])
454 continue;
455 if (!p1[k] || !q1[k])
456 break;
457 if (memcmp(p1[k], q1[k], 64*sizeof(u16)))
458 break;
459 }
460 if (k < 32)
461 break;
462 }
463 if (j == 32) {
464 q->refcount++;
465 *conp->vc_uni_pagedir_loc = q;
466 con_release_unimap(p);
467 kfree(p);
468 return 1;
469 }
470 }
471 return 0;
472}
473
474static int
475con_insert_unipair(struct uni_pagedir *p, u_short unicode, u_short fontpos)
476{
477 int i, n;
478 u16 **p1, *p2;
479
480 p1 = p->uni_pgdir[n = unicode >> 11];
481 if (!p1) {
482 p1 = p->uni_pgdir[n] = kmalloc_array(32, sizeof(u16 *),
483 GFP_KERNEL);
484 if (!p1) return -ENOMEM;
485 for (i = 0; i < 32; i++)
486 p1[i] = NULL;
487 }
488
489 p2 = p1[n = (unicode >> 6) & 0x1f];
490 if (!p2) {
491 p2 = p1[n] = kmalloc_array(64, sizeof(u16), GFP_KERNEL);
492 if (!p2) return -ENOMEM;
493 memset(p2, 0xff, 64*sizeof(u16)); /* No glyphs for the characters (yet) */
494 }
495
496 p2[unicode & 0x3f] = fontpos;
497
498 p->sum += (fontpos << 20) + unicode;
499
500 return 0;
501}
502
503/* Caller must hold the lock */
504static int con_do_clear_unimap(struct vc_data *vc)
505{
506 struct uni_pagedir *p, *q;
507
508 p = *vc->vc_uni_pagedir_loc;
509 if (!p || --p->refcount) {
510 q = kzalloc(sizeof(*p), GFP_KERNEL);
511 if (!q) {
512 if (p)
513 p->refcount++;
514 return -ENOMEM;
515 }
516 q->refcount=1;
517 *vc->vc_uni_pagedir_loc = q;
518 } else {
519 if (p == dflt) dflt = NULL;
520 p->refcount++;
521 p->sum = 0;
522 con_release_unimap(p);
523 }
524 return 0;
525}
526
527int con_clear_unimap(struct vc_data *vc)
528{
529 int ret;
530 console_lock();
531 ret = con_do_clear_unimap(vc);
532 console_unlock();
533 return ret;
534}
535
536int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
537{
538 int err = 0, err1, i;
539 struct uni_pagedir *p, *q;
540 struct unipair *unilist, *plist;
541
542 if (!ct)
543 return 0;
544
545 unilist = vmemdup_user(list, array_size(sizeof(struct unipair), ct));
546 if (IS_ERR(unilist))
547 return PTR_ERR(unilist);
548
549 console_lock();
550
551 /* Save original vc_unipagdir_loc in case we allocate a new one */
552 p = *vc->vc_uni_pagedir_loc;
553
554 if (!p) {
555 err = -EINVAL;
556
557 goto out_unlock;
558 }
559
560 if (p->refcount > 1) {
561 int j, k;
562 u16 **p1, *p2, l;
563
564 err1 = con_do_clear_unimap(vc);
565 if (err1) {
566 err = err1;
567 goto out_unlock;
568 }
569
570 /*
571 * Since refcount was > 1, con_clear_unimap() allocated a
572 * a new uni_pagedir for this vc. Re: p != q
573 */
574 q = *vc->vc_uni_pagedir_loc;
575
576 /*
577 * uni_pgdir is a 32*32*64 table with rows allocated
578 * when its first entry is added. The unicode value must
579 * still be incremented for empty rows. We are copying
580 * entries from "p" (old) to "q" (new).
581 */
582 l = 0; /* unicode value */
583 for (i = 0; i < 32; i++) {
584 p1 = p->uni_pgdir[i];
585 if (p1)
586 for (j = 0; j < 32; j++) {
587 p2 = p1[j];
588 if (p2) {
589 for (k = 0; k < 64; k++, l++)
590 if (p2[k] != 0xffff) {
591 /*
592 * Found one, copy entry for unicode
593 * l with fontpos value p2[k].
594 */
595 err1 = con_insert_unipair(q, l, p2[k]);
596 if (err1) {
597 p->refcount++;
598 *vc->vc_uni_pagedir_loc = p;
599 con_release_unimap(q);
600 kfree(q);
601 err = err1;
602 goto out_unlock;
603 }
604 }
605 } else {
606 /* Account for row of 64 empty entries */
607 l += 64;
608 }
609 }
610 else
611 /* Account for empty table */
612 l += 32 * 64;
613 }
614
615 /*
616 * Finished copying font table, set vc_uni_pagedir to new table
617 */
618 p = q;
619 } else if (p == dflt) {
620 dflt = NULL;
621 }
622
623 /*
624 * Insert user specified unicode pairs into new table.
625 */
626 for (plist = unilist; ct; ct--, plist++) {
627 err1 = con_insert_unipair(p, plist->unicode, plist->fontpos);
628 if (err1)
629 err = err1;
630 }
631
632 /*
633 * Merge with fontmaps of any other virtual consoles.
634 */
635 if (con_unify_unimap(vc, p))
636 goto out_unlock;
637
638 for (i = 0; i <= 3; i++)
639 set_inverse_transl(vc, p, i); /* Update inverse translations */
640 set_inverse_trans_unicode(vc, p);
641
642out_unlock:
643 console_unlock();
644 kvfree(unilist);
645 return err;
646}
647
648/**
649 * con_set_default_unimap - set default unicode map
650 * @vc: the console we are updating
651 *
652 * Loads the unimap for the hardware font, as defined in uni_hash.tbl.
653 * The representation used was the most compact I could come up
654 * with. This routine is executed at video setup, and when the
655 * PIO_FONTRESET ioctl is called.
656 *
657 * The caller must hold the console lock
658 */
659int con_set_default_unimap(struct vc_data *vc)
660{
661 int i, j, err = 0, err1;
662 u16 *q;
663 struct uni_pagedir *p;
664
665 if (dflt) {
666 p = *vc->vc_uni_pagedir_loc;
667 if (p == dflt)
668 return 0;
669
670 dflt->refcount++;
671 *vc->vc_uni_pagedir_loc = dflt;
672 if (p && !--p->refcount) {
673 con_release_unimap(p);
674 kfree(p);
675 }
676 return 0;
677 }
678
679 /* The default font is always 256 characters */
680
681 err = con_do_clear_unimap(vc);
682 if (err)
683 return err;
684
685 p = *vc->vc_uni_pagedir_loc;
686 q = dfont_unitable;
687
688 for (i = 0; i < 256; i++)
689 for (j = dfont_unicount[i]; j; j--) {
690 err1 = con_insert_unipair(p, *(q++), i);
691 if (err1)
692 err = err1;
693 }
694
695 if (con_unify_unimap(vc, p)) {
696 dflt = *vc->vc_uni_pagedir_loc;
697 return err;
698 }
699
700 for (i = 0; i <= 3; i++)
701 set_inverse_transl(vc, p, i); /* Update all inverse translations */
702 set_inverse_trans_unicode(vc, p);
703 dflt = p;
704 return err;
705}
706EXPORT_SYMBOL(con_set_default_unimap);
707
708/**
709 * con_copy_unimap - copy unimap between two vts
710 * @dst_vc: target
711 * @src_vt: source
712 *
713 * The caller must hold the console lock when invoking this method
714 */
715int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc)
716{
717 struct uni_pagedir *q;
718
719 if (!*src_vc->vc_uni_pagedir_loc)
720 return -EINVAL;
721 if (*dst_vc->vc_uni_pagedir_loc == *src_vc->vc_uni_pagedir_loc)
722 return 0;
723 con_free_unimap(dst_vc);
724 q = *src_vc->vc_uni_pagedir_loc;
725 q->refcount++;
726 *dst_vc->vc_uni_pagedir_loc = q;
727 return 0;
728}
729EXPORT_SYMBOL(con_copy_unimap);
730
731/**
732 * con_get_unimap - get the unicode map
733 * @vc: the console to read from
734 *
735 * Read the console unicode data for this console. Called from the ioctl
736 * handlers.
737 */
738int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct unipair __user *list)
739{
740 int i, j, k, ret = 0;
741 ushort ect;
742 u16 **p1, *p2;
743 struct uni_pagedir *p;
744 struct unipair *unilist;
745
746 unilist = kvmalloc_array(ct, sizeof(struct unipair), GFP_KERNEL);
747 if (!unilist)
748 return -ENOMEM;
749
750 console_lock();
751
752 ect = 0;
753 if (*vc->vc_uni_pagedir_loc) {
754 p = *vc->vc_uni_pagedir_loc;
755 for (i = 0; i < 32; i++) {
756 p1 = p->uni_pgdir[i];
757 if (p1)
758 for (j = 0; j < 32; j++) {
759 p2 = *(p1++);
760 if (p2)
761 for (k = 0; k < 64; k++, p2++) {
762 if (*p2 >= MAX_GLYPH)
763 continue;
764 if (ect < ct) {
765 unilist[ect].unicode =
766 (i<<11)+(j<<6)+k;
767 unilist[ect].fontpos = *p2;
768 }
769 ect++;
770 }
771 }
772 }
773 }
774 console_unlock();
775 if (copy_to_user(list, unilist, min(ect, ct) * sizeof(struct unipair)))
776 ret = -EFAULT;
777 put_user(ect, uct);
778 kvfree(unilist);
779 return ret ? ret : (ect <= ct) ? 0 : -ENOMEM;
780}
781
782/*
783 * Always use USER_MAP. These functions are used by the keyboard,
784 * which shouldn't be affected by G0/G1 switching, etc.
785 * If the user map still contains default values, i.e. the
786 * direct-to-font mapping, then assume user is using Latin1.
787 *
788 * FIXME: at some point we need to decide if we want to lock the table
789 * update element itself via the keyboard_event_lock for consistency with the
790 * keyboard driver as well as the consoles
791 */
792/* may be called during an interrupt */
793u32 conv_8bit_to_uni(unsigned char c)
794{
795 unsigned short uni = translations[USER_MAP][c];
796 return uni == (0xf000 | c) ? c : uni;
797}
798
799int conv_uni_to_8bit(u32 uni)
800{
801 int c;
802 for (c = 0; c < 0x100; c++)
803 if (translations[USER_MAP][c] == uni ||
804 (translations[USER_MAP][c] == (c | 0xf000) && uni == c))
805 return c;
806 return -1;
807}
808
809int
810conv_uni_to_pc(struct vc_data *conp, long ucs)
811{
812 int h;
813 u16 **p1, *p2;
814 struct uni_pagedir *p;
815
816 /* Only 16-bit codes supported at this time */
817 if (ucs > 0xffff)
818 return -4; /* Not found */
819 else if (ucs < 0x20)
820 return -1; /* Not a printable character */
821 else if (ucs == 0xfeff || (ucs >= 0x200b && ucs <= 0x200f))
822 return -2; /* Zero-width space */
823 /*
824 * UNI_DIRECT_BASE indicates the start of the region in the User Zone
825 * which always has a 1:1 mapping to the currently loaded font. The
826 * UNI_DIRECT_MASK indicates the bit span of the region.
827 */
828 else if ((ucs & ~UNI_DIRECT_MASK) == UNI_DIRECT_BASE)
829 return ucs & UNI_DIRECT_MASK;
830
831 if (!*conp->vc_uni_pagedir_loc)
832 return -3;
833
834 p = *conp->vc_uni_pagedir_loc;
835 if ((p1 = p->uni_pgdir[ucs >> 11]) &&
836 (p2 = p1[(ucs >> 6) & 0x1f]) &&
837 (h = p2[ucs & 0x3f]) < MAX_GLYPH)
838 return h;
839
840 return -4; /* not found */
841}
842
843/*
844 * This is called at sys_setup time, after memory and the console are
845 * initialized. It must be possible to call kmalloc(..., GFP_KERNEL)
846 * from this function, hence the call from sys_setup.
847 */
848void __init
849console_map_init(void)
850{
851 int i;
852
853 for (i = 0; i < MAX_NR_CONSOLES; i++)
854 if (vc_cons_allocated(i) && !*vc_cons[i].d->vc_uni_pagedir_loc)
855 con_set_default_unimap(vc_cons[i].d);
856}
857
1/*
2 * consolemap.c
3 *
4 * Mapping from internal code (such as Latin-1 or Unicode or IBM PC code)
5 * to font positions.
6 *
7 * aeb, 950210
8 *
9 * Support for multiple unimaps by Jakub Jelinek <jj@ultra.linux.cz>, July 1998
10 *
11 * Fix bug in inverse translation. Stanislav Voronyi <stas@cnti.uanet.kharkov.ua>, Dec 1998
12 *
13 * In order to prevent the following circular lock dependency:
14 * &mm->mmap_sem --> cpu_hotplug.lock --> console_lock --> &mm->mmap_sem
15 *
16 * We cannot allow page fault to happen while holding the console_lock.
17 * Therefore, all the userspace copy operations have to be done outside
18 * the console_lock critical sections.
19 *
20 * As all the affected functions are all called directly from vt_ioctl(), we
21 * can allocate some small buffers directly on stack without worrying about
22 * stack overflow.
23 */
24
25#include <linux/module.h>
26#include <linux/kd.h>
27#include <linux/errno.h>
28#include <linux/mm.h>
29#include <linux/slab.h>
30#include <linux/init.h>
31#include <linux/tty.h>
32#include <linux/uaccess.h>
33#include <linux/console.h>
34#include <linux/consolemap.h>
35#include <linux/vt_kern.h>
36#include <linux/string.h>
37
38static unsigned short translations[][256] = {
39 /* 8-bit Latin-1 mapped to Unicode -- trivial mapping */
40 {
41 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
42 0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
43 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
44 0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
45 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
46 0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
47 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
48 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
49 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
50 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
51 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
52 0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
53 0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
54 0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
55 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
56 0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x007f,
57 0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
58 0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
59 0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
60 0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
61 0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
62 0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
63 0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
64 0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
65 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
66 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
67 0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
68 0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
69 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
70 0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
71 0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
72 0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
73 },
74 /* VT100 graphics mapped to Unicode */
75 {
76 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
77 0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
78 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
79 0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
80 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
81 0x0028, 0x0029, 0x002a, 0x2192, 0x2190, 0x2191, 0x2193, 0x002f,
82 0x2588, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
83 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
84 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
85 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
86 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
87 0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x00a0,
88 0x25c6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1,
89 0x2591, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba,
90 0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c,
91 0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7, 0x007f,
92 0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
93 0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
94 0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
95 0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
96 0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
97 0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
98 0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
99 0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
100 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
101 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
102 0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
103 0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
104 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
105 0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
106 0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
107 0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
108 },
109 /* IBM Codepage 437 mapped to Unicode */
110 {
111 0x0000, 0x263a, 0x263b, 0x2665, 0x2666, 0x2663, 0x2660, 0x2022,
112 0x25d8, 0x25cb, 0x25d9, 0x2642, 0x2640, 0x266a, 0x266b, 0x263c,
113 0x25b6, 0x25c0, 0x2195, 0x203c, 0x00b6, 0x00a7, 0x25ac, 0x21a8,
114 0x2191, 0x2193, 0x2192, 0x2190, 0x221f, 0x2194, 0x25b2, 0x25bc,
115 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
116 0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
117 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
118 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
119 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
120 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
121 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
122 0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
123 0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
124 0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
125 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
126 0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x2302,
127 0x00c7, 0x00fc, 0x00e9, 0x00e2, 0x00e4, 0x00e0, 0x00e5, 0x00e7,
128 0x00ea, 0x00eb, 0x00e8, 0x00ef, 0x00ee, 0x00ec, 0x00c4, 0x00c5,
129 0x00c9, 0x00e6, 0x00c6, 0x00f4, 0x00f6, 0x00f2, 0x00fb, 0x00f9,
130 0x00ff, 0x00d6, 0x00dc, 0x00a2, 0x00a3, 0x00a5, 0x20a7, 0x0192,
131 0x00e1, 0x00ed, 0x00f3, 0x00fa, 0x00f1, 0x00d1, 0x00aa, 0x00ba,
132 0x00bf, 0x2310, 0x00ac, 0x00bd, 0x00bc, 0x00a1, 0x00ab, 0x00bb,
133 0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556,
134 0x2555, 0x2563, 0x2551, 0x2557, 0x255d, 0x255c, 0x255b, 0x2510,
135 0x2514, 0x2534, 0x252c, 0x251c, 0x2500, 0x253c, 0x255e, 0x255f,
136 0x255a, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256c, 0x2567,
137 0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256b,
138 0x256a, 0x2518, 0x250c, 0x2588, 0x2584, 0x258c, 0x2590, 0x2580,
139 0x03b1, 0x00df, 0x0393, 0x03c0, 0x03a3, 0x03c3, 0x00b5, 0x03c4,
140 0x03a6, 0x0398, 0x03a9, 0x03b4, 0x221e, 0x03c6, 0x03b5, 0x2229,
141 0x2261, 0x00b1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00f7, 0x2248,
142 0x00b0, 0x2219, 0x00b7, 0x221a, 0x207f, 0x00b2, 0x25a0, 0x00a0
143 },
144 /* User mapping -- default to codes for direct font mapping */
145 {
146 0xf000, 0xf001, 0xf002, 0xf003, 0xf004, 0xf005, 0xf006, 0xf007,
147 0xf008, 0xf009, 0xf00a, 0xf00b, 0xf00c, 0xf00d, 0xf00e, 0xf00f,
148 0xf010, 0xf011, 0xf012, 0xf013, 0xf014, 0xf015, 0xf016, 0xf017,
149 0xf018, 0xf019, 0xf01a, 0xf01b, 0xf01c, 0xf01d, 0xf01e, 0xf01f,
150 0xf020, 0xf021, 0xf022, 0xf023, 0xf024, 0xf025, 0xf026, 0xf027,
151 0xf028, 0xf029, 0xf02a, 0xf02b, 0xf02c, 0xf02d, 0xf02e, 0xf02f,
152 0xf030, 0xf031, 0xf032, 0xf033, 0xf034, 0xf035, 0xf036, 0xf037,
153 0xf038, 0xf039, 0xf03a, 0xf03b, 0xf03c, 0xf03d, 0xf03e, 0xf03f,
154 0xf040, 0xf041, 0xf042, 0xf043, 0xf044, 0xf045, 0xf046, 0xf047,
155 0xf048, 0xf049, 0xf04a, 0xf04b, 0xf04c, 0xf04d, 0xf04e, 0xf04f,
156 0xf050, 0xf051, 0xf052, 0xf053, 0xf054, 0xf055, 0xf056, 0xf057,
157 0xf058, 0xf059, 0xf05a, 0xf05b, 0xf05c, 0xf05d, 0xf05e, 0xf05f,
158 0xf060, 0xf061, 0xf062, 0xf063, 0xf064, 0xf065, 0xf066, 0xf067,
159 0xf068, 0xf069, 0xf06a, 0xf06b, 0xf06c, 0xf06d, 0xf06e, 0xf06f,
160 0xf070, 0xf071, 0xf072, 0xf073, 0xf074, 0xf075, 0xf076, 0xf077,
161 0xf078, 0xf079, 0xf07a, 0xf07b, 0xf07c, 0xf07d, 0xf07e, 0xf07f,
162 0xf080, 0xf081, 0xf082, 0xf083, 0xf084, 0xf085, 0xf086, 0xf087,
163 0xf088, 0xf089, 0xf08a, 0xf08b, 0xf08c, 0xf08d, 0xf08e, 0xf08f,
164 0xf090, 0xf091, 0xf092, 0xf093, 0xf094, 0xf095, 0xf096, 0xf097,
165 0xf098, 0xf099, 0xf09a, 0xf09b, 0xf09c, 0xf09d, 0xf09e, 0xf09f,
166 0xf0a0, 0xf0a1, 0xf0a2, 0xf0a3, 0xf0a4, 0xf0a5, 0xf0a6, 0xf0a7,
167 0xf0a8, 0xf0a9, 0xf0aa, 0xf0ab, 0xf0ac, 0xf0ad, 0xf0ae, 0xf0af,
168 0xf0b0, 0xf0b1, 0xf0b2, 0xf0b3, 0xf0b4, 0xf0b5, 0xf0b6, 0xf0b7,
169 0xf0b8, 0xf0b9, 0xf0ba, 0xf0bb, 0xf0bc, 0xf0bd, 0xf0be, 0xf0bf,
170 0xf0c0, 0xf0c1, 0xf0c2, 0xf0c3, 0xf0c4, 0xf0c5, 0xf0c6, 0xf0c7,
171 0xf0c8, 0xf0c9, 0xf0ca, 0xf0cb, 0xf0cc, 0xf0cd, 0xf0ce, 0xf0cf,
172 0xf0d0, 0xf0d1, 0xf0d2, 0xf0d3, 0xf0d4, 0xf0d5, 0xf0d6, 0xf0d7,
173 0xf0d8, 0xf0d9, 0xf0da, 0xf0db, 0xf0dc, 0xf0dd, 0xf0de, 0xf0df,
174 0xf0e0, 0xf0e1, 0xf0e2, 0xf0e3, 0xf0e4, 0xf0e5, 0xf0e6, 0xf0e7,
175 0xf0e8, 0xf0e9, 0xf0ea, 0xf0eb, 0xf0ec, 0xf0ed, 0xf0ee, 0xf0ef,
176 0xf0f0, 0xf0f1, 0xf0f2, 0xf0f3, 0xf0f4, 0xf0f5, 0xf0f6, 0xf0f7,
177 0xf0f8, 0xf0f9, 0xf0fa, 0xf0fb, 0xf0fc, 0xf0fd, 0xf0fe, 0xf0ff
178 }
179};
180
181/* The standard kernel character-to-font mappings are not invertible
182 -- this is just a best effort. */
183
184#define MAX_GLYPH 512 /* Max possible glyph value */
185
186static int inv_translate[MAX_NR_CONSOLES];
187
188struct uni_pagedir {
189 u16 **uni_pgdir[32];
190 unsigned long refcount;
191 unsigned long sum;
192 unsigned char *inverse_translations[4];
193 u16 *inverse_trans_unicode;
194};
195
196static struct uni_pagedir *dflt;
197
198static void set_inverse_transl(struct vc_data *conp, struct uni_pagedir *p, int i)
199{
200 int j, glyph;
201 unsigned short *t = translations[i];
202 unsigned char *q;
203
204 if (!p) return;
205 q = p->inverse_translations[i];
206
207 if (!q) {
208 q = p->inverse_translations[i] = kmalloc(MAX_GLYPH, GFP_KERNEL);
209 if (!q) return;
210 }
211 memset(q, 0, MAX_GLYPH);
212
213 for (j = 0; j < E_TABSZ; j++) {
214 glyph = conv_uni_to_pc(conp, t[j]);
215 if (glyph >= 0 && glyph < MAX_GLYPH && q[glyph] < 32) {
216 /* prefer '-' above SHY etc. */
217 q[glyph] = j;
218 }
219 }
220}
221
222static void set_inverse_trans_unicode(struct vc_data *conp,
223 struct uni_pagedir *p)
224{
225 int i, j, k, glyph;
226 u16 **p1, *p2;
227 u16 *q;
228
229 if (!p) return;
230 q = p->inverse_trans_unicode;
231 if (!q) {
232 q = p->inverse_trans_unicode =
233 kmalloc(MAX_GLYPH * sizeof(u16), GFP_KERNEL);
234 if (!q)
235 return;
236 }
237 memset(q, 0, MAX_GLYPH * sizeof(u16));
238
239 for (i = 0; i < 32; i++) {
240 p1 = p->uni_pgdir[i];
241 if (!p1)
242 continue;
243 for (j = 0; j < 32; j++) {
244 p2 = p1[j];
245 if (!p2)
246 continue;
247 for (k = 0; k < 64; k++) {
248 glyph = p2[k];
249 if (glyph >= 0 && glyph < MAX_GLYPH
250 && q[glyph] < 32)
251 q[glyph] = (i << 11) + (j << 6) + k;
252 }
253 }
254 }
255}
256
257unsigned short *set_translate(int m, struct vc_data *vc)
258{
259 inv_translate[vc->vc_num] = m;
260 return translations[m];
261}
262
263/*
264 * Inverse translation is impossible for several reasons:
265 * 1. The font<->character maps are not 1-1.
266 * 2. The text may have been written while a different translation map
267 * was active.
268 * Still, it is now possible to a certain extent to cut and paste non-ASCII.
269 */
270u16 inverse_translate(struct vc_data *conp, int glyph, int use_unicode)
271{
272 struct uni_pagedir *p;
273 int m;
274 if (glyph < 0 || glyph >= MAX_GLYPH)
275 return 0;
276 else {
277 p = *conp->vc_uni_pagedir_loc;
278 if (!p)
279 return glyph;
280 else if (use_unicode) {
281 if (!p->inverse_trans_unicode)
282 return glyph;
283 else
284 return p->inverse_trans_unicode[glyph];
285 } else {
286 m = inv_translate[conp->vc_num];
287 if (!p->inverse_translations[m])
288 return glyph;
289 else
290 return p->inverse_translations[m][glyph];
291 }
292 }
293}
294EXPORT_SYMBOL_GPL(inverse_translate);
295
296static void update_user_maps(void)
297{
298 int i;
299 struct uni_pagedir *p, *q = NULL;
300
301 for (i = 0; i < MAX_NR_CONSOLES; i++) {
302 if (!vc_cons_allocated(i))
303 continue;
304 p = *vc_cons[i].d->vc_uni_pagedir_loc;
305 if (p && p != q) {
306 set_inverse_transl(vc_cons[i].d, p, USER_MAP);
307 set_inverse_trans_unicode(vc_cons[i].d, p);
308 q = p;
309 }
310 }
311}
312
313/*
314 * Load customizable translation table
315 * arg points to a 256 byte translation table.
316 *
317 * The "old" variants are for translation directly to font (using the
318 * 0xf000-0xf0ff "transparent" Unicodes) whereas the "new" variants set
319 * Unicodes explicitly.
320 */
321int con_set_trans_old(unsigned char __user * arg)
322{
323 int i;
324 unsigned short inbuf[E_TABSZ];
325
326 if (!access_ok(VERIFY_READ, arg, E_TABSZ))
327 return -EFAULT;
328
329 for (i = 0; i < E_TABSZ ; i++) {
330 unsigned char uc;
331 __get_user(uc, arg+i);
332 inbuf[i] = UNI_DIRECT_BASE | uc;
333 }
334
335 console_lock();
336 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
337 update_user_maps();
338 console_unlock();
339 return 0;
340}
341
342int con_get_trans_old(unsigned char __user * arg)
343{
344 int i, ch;
345 unsigned short *p = translations[USER_MAP];
346 unsigned char outbuf[E_TABSZ];
347
348 if (!access_ok(VERIFY_WRITE, arg, E_TABSZ))
349 return -EFAULT;
350
351 console_lock();
352 for (i = 0; i < E_TABSZ ; i++)
353 {
354 ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]);
355 outbuf[i] = (ch & ~0xff) ? 0 : ch;
356 }
357 console_unlock();
358
359 for (i = 0; i < E_TABSZ ; i++)
360 __put_user(outbuf[i], arg+i);
361 return 0;
362}
363
364int con_set_trans_new(ushort __user * arg)
365{
366 int i;
367 unsigned short inbuf[E_TABSZ];
368
369 if (!access_ok(VERIFY_READ, arg, E_TABSZ*sizeof(unsigned short)))
370 return -EFAULT;
371
372 for (i = 0; i < E_TABSZ ; i++)
373 __get_user(inbuf[i], arg+i);
374
375 console_lock();
376 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
377 update_user_maps();
378 console_unlock();
379 return 0;
380}
381
382int con_get_trans_new(ushort __user * arg)
383{
384 int i;
385 unsigned short outbuf[E_TABSZ];
386
387 if (!access_ok(VERIFY_WRITE, arg, E_TABSZ*sizeof(unsigned short)))
388 return -EFAULT;
389
390 console_lock();
391 memcpy(outbuf, translations[USER_MAP], sizeof(outbuf));
392 console_unlock();
393
394 for (i = 0; i < E_TABSZ ; i++)
395 __put_user(outbuf[i], arg+i);
396 return 0;
397}
398
399/*
400 * Unicode -> current font conversion
401 *
402 * A font has at most 512 chars, usually 256.
403 * But one font position may represent several Unicode chars.
404 * A hashtable is somewhat of a pain to deal with, so use a
405 * "paged table" instead. Simulation has shown the memory cost of
406 * this 3-level paged table scheme to be comparable to a hash table.
407 */
408
409extern u8 dfont_unicount[]; /* Defined in console_defmap.c */
410extern u16 dfont_unitable[];
411
412static void con_release_unimap(struct uni_pagedir *p)
413{
414 u16 **p1;
415 int i, j;
416
417 if (p == dflt) dflt = NULL;
418 for (i = 0; i < 32; i++) {
419 p1 = p->uni_pgdir[i];
420 if (p1 != NULL) {
421 for (j = 0; j < 32; j++)
422 kfree(p1[j]);
423 kfree(p1);
424 }
425 p->uni_pgdir[i] = NULL;
426 }
427 for (i = 0; i < 4; i++) {
428 kfree(p->inverse_translations[i]);
429 p->inverse_translations[i] = NULL;
430 }
431 kfree(p->inverse_trans_unicode);
432 p->inverse_trans_unicode = NULL;
433}
434
435/* Caller must hold the console lock */
436void con_free_unimap(struct vc_data *vc)
437{
438 struct uni_pagedir *p;
439
440 p = *vc->vc_uni_pagedir_loc;
441 if (!p)
442 return;
443 *vc->vc_uni_pagedir_loc = NULL;
444 if (--p->refcount)
445 return;
446 con_release_unimap(p);
447 kfree(p);
448}
449
450static int con_unify_unimap(struct vc_data *conp, struct uni_pagedir *p)
451{
452 int i, j, k;
453 struct uni_pagedir *q;
454
455 for (i = 0; i < MAX_NR_CONSOLES; i++) {
456 if (!vc_cons_allocated(i))
457 continue;
458 q = *vc_cons[i].d->vc_uni_pagedir_loc;
459 if (!q || q == p || q->sum != p->sum)
460 continue;
461 for (j = 0; j < 32; j++) {
462 u16 **p1, **q1;
463 p1 = p->uni_pgdir[j]; q1 = q->uni_pgdir[j];
464 if (!p1 && !q1)
465 continue;
466 if (!p1 || !q1)
467 break;
468 for (k = 0; k < 32; k++) {
469 if (!p1[k] && !q1[k])
470 continue;
471 if (!p1[k] || !q1[k])
472 break;
473 if (memcmp(p1[k], q1[k], 64*sizeof(u16)))
474 break;
475 }
476 if (k < 32)
477 break;
478 }
479 if (j == 32) {
480 q->refcount++;
481 *conp->vc_uni_pagedir_loc = q;
482 con_release_unimap(p);
483 kfree(p);
484 return 1;
485 }
486 }
487 return 0;
488}
489
490static int
491con_insert_unipair(struct uni_pagedir *p, u_short unicode, u_short fontpos)
492{
493 int i, n;
494 u16 **p1, *p2;
495
496 p1 = p->uni_pgdir[n = unicode >> 11];
497 if (!p1) {
498 p1 = p->uni_pgdir[n] = kmalloc(32*sizeof(u16 *), GFP_KERNEL);
499 if (!p1) return -ENOMEM;
500 for (i = 0; i < 32; i++)
501 p1[i] = NULL;
502 }
503
504 p2 = p1[n = (unicode >> 6) & 0x1f];
505 if (!p2) {
506 p2 = p1[n] = kmalloc(64*sizeof(u16), GFP_KERNEL);
507 if (!p2) return -ENOMEM;
508 memset(p2, 0xff, 64*sizeof(u16)); /* No glyphs for the characters (yet) */
509 }
510
511 p2[unicode & 0x3f] = fontpos;
512
513 p->sum += (fontpos << 20) + unicode;
514
515 return 0;
516}
517
518/* Caller must hold the lock */
519static int con_do_clear_unimap(struct vc_data *vc)
520{
521 struct uni_pagedir *p, *q;
522
523 p = *vc->vc_uni_pagedir_loc;
524 if (!p || --p->refcount) {
525 q = kzalloc(sizeof(*p), GFP_KERNEL);
526 if (!q) {
527 if (p)
528 p->refcount++;
529 return -ENOMEM;
530 }
531 q->refcount=1;
532 *vc->vc_uni_pagedir_loc = q;
533 } else {
534 if (p == dflt) dflt = NULL;
535 p->refcount++;
536 p->sum = 0;
537 con_release_unimap(p);
538 }
539 return 0;
540}
541
542int con_clear_unimap(struct vc_data *vc)
543{
544 int ret;
545 console_lock();
546 ret = con_do_clear_unimap(vc);
547 console_unlock();
548 return ret;
549}
550
551int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
552{
553 int err = 0, err1, i;
554 struct uni_pagedir *p, *q;
555 struct unipair *unilist, *plist;
556
557 if (!ct)
558 return 0;
559
560 unilist = kmalloc_array(ct, sizeof(struct unipair), GFP_KERNEL);
561 if (!unilist)
562 return -ENOMEM;
563
564 for (i = ct, plist = unilist; i; i--, plist++, list++) {
565 __get_user(plist->unicode, &list->unicode);
566 __get_user(plist->fontpos, &list->fontpos);
567 }
568
569 console_lock();
570
571 /* Save original vc_unipagdir_loc in case we allocate a new one */
572 p = *vc->vc_uni_pagedir_loc;
573
574 if (!p) {
575 err = -EINVAL;
576
577 goto out_unlock;
578 }
579
580 if (p->refcount > 1) {
581 int j, k;
582 u16 **p1, *p2, l;
583
584 err1 = con_do_clear_unimap(vc);
585 if (err1) {
586 err = err1;
587 goto out_unlock;
588 }
589
590 /*
591 * Since refcount was > 1, con_clear_unimap() allocated a
592 * a new uni_pagedir for this vc. Re: p != q
593 */
594 q = *vc->vc_uni_pagedir_loc;
595
596 /*
597 * uni_pgdir is a 32*32*64 table with rows allocated
598 * when its first entry is added. The unicode value must
599 * still be incremented for empty rows. We are copying
600 * entries from "p" (old) to "q" (new).
601 */
602 l = 0; /* unicode value */
603 for (i = 0; i < 32; i++) {
604 p1 = p->uni_pgdir[i];
605 if (p1)
606 for (j = 0; j < 32; j++) {
607 p2 = p1[j];
608 if (p2) {
609 for (k = 0; k < 64; k++, l++)
610 if (p2[k] != 0xffff) {
611 /*
612 * Found one, copy entry for unicode
613 * l with fontpos value p2[k].
614 */
615 err1 = con_insert_unipair(q, l, p2[k]);
616 if (err1) {
617 p->refcount++;
618 *vc->vc_uni_pagedir_loc = p;
619 con_release_unimap(q);
620 kfree(q);
621 err = err1;
622 goto out_unlock;
623 }
624 }
625 } else {
626 /* Account for row of 64 empty entries */
627 l += 64;
628 }
629 }
630 else
631 /* Account for empty table */
632 l += 32 * 64;
633 }
634
635 /*
636 * Finished copying font table, set vc_uni_pagedir to new table
637 */
638 p = q;
639 } else if (p == dflt) {
640 dflt = NULL;
641 }
642
643 /*
644 * Insert user specified unicode pairs into new table.
645 */
646 for (plist = unilist; ct; ct--, plist++) {
647 err1 = con_insert_unipair(p, plist->unicode, plist->fontpos);
648 if (err1)
649 err = err1;
650 }
651
652 /*
653 * Merge with fontmaps of any other virtual consoles.
654 */
655 if (con_unify_unimap(vc, p))
656 goto out_unlock;
657
658 for (i = 0; i <= 3; i++)
659 set_inverse_transl(vc, p, i); /* Update inverse translations */
660 set_inverse_trans_unicode(vc, p);
661
662out_unlock:
663 console_unlock();
664 kfree(unilist);
665 return err;
666}
667
668/**
669 * con_set_default_unimap - set default unicode map
670 * @vc: the console we are updating
671 *
672 * Loads the unimap for the hardware font, as defined in uni_hash.tbl.
673 * The representation used was the most compact I could come up
674 * with. This routine is executed at video setup, and when the
675 * PIO_FONTRESET ioctl is called.
676 *
677 * The caller must hold the console lock
678 */
679int con_set_default_unimap(struct vc_data *vc)
680{
681 int i, j, err = 0, err1;
682 u16 *q;
683 struct uni_pagedir *p;
684
685 if (dflt) {
686 p = *vc->vc_uni_pagedir_loc;
687 if (p == dflt)
688 return 0;
689
690 dflt->refcount++;
691 *vc->vc_uni_pagedir_loc = dflt;
692 if (p && !--p->refcount) {
693 con_release_unimap(p);
694 kfree(p);
695 }
696 return 0;
697 }
698
699 /* The default font is always 256 characters */
700
701 err = con_do_clear_unimap(vc);
702 if (err)
703 return err;
704
705 p = *vc->vc_uni_pagedir_loc;
706 q = dfont_unitable;
707
708 for (i = 0; i < 256; i++)
709 for (j = dfont_unicount[i]; j; j--) {
710 err1 = con_insert_unipair(p, *(q++), i);
711 if (err1)
712 err = err1;
713 }
714
715 if (con_unify_unimap(vc, p)) {
716 dflt = *vc->vc_uni_pagedir_loc;
717 return err;
718 }
719
720 for (i = 0; i <= 3; i++)
721 set_inverse_transl(vc, p, i); /* Update all inverse translations */
722 set_inverse_trans_unicode(vc, p);
723 dflt = p;
724 return err;
725}
726EXPORT_SYMBOL(con_set_default_unimap);
727
728/**
729 * con_copy_unimap - copy unimap between two vts
730 * @dst_vc: target
731 * @src_vt: source
732 *
733 * The caller must hold the console lock when invoking this method
734 */
735int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc)
736{
737 struct uni_pagedir *q;
738
739 if (!*src_vc->vc_uni_pagedir_loc)
740 return -EINVAL;
741 if (*dst_vc->vc_uni_pagedir_loc == *src_vc->vc_uni_pagedir_loc)
742 return 0;
743 con_free_unimap(dst_vc);
744 q = *src_vc->vc_uni_pagedir_loc;
745 q->refcount++;
746 *dst_vc->vc_uni_pagedir_loc = q;
747 return 0;
748}
749EXPORT_SYMBOL(con_copy_unimap);
750
751/**
752 * con_get_unimap - get the unicode map
753 * @vc: the console to read from
754 *
755 * Read the console unicode data for this console. Called from the ioctl
756 * handlers.
757 */
758int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct unipair __user *list)
759{
760 int i, j, k;
761 ushort ect;
762 u16 **p1, *p2;
763 struct uni_pagedir *p;
764 struct unipair *unilist, *plist;
765
766 unilist = kmalloc_array(ct, sizeof(struct unipair), GFP_KERNEL);
767 if (!unilist)
768 return -ENOMEM;
769
770 console_lock();
771
772 ect = 0;
773 if (*vc->vc_uni_pagedir_loc) {
774 p = *vc->vc_uni_pagedir_loc;
775 for (i = 0; i < 32; i++) {
776 p1 = p->uni_pgdir[i];
777 if (p1)
778 for (j = 0; j < 32; j++) {
779 p2 = *(p1++);
780 if (p2)
781 for (k = 0; k < 64; k++, p2++) {
782 if (*p2 >= MAX_GLYPH)
783 continue;
784 if (ect < ct) {
785 unilist[ect].unicode =
786 (i<<11)+(j<<6)+k;
787 unilist[ect].fontpos = *p2;
788 }
789 ect++;
790 }
791 }
792 }
793 }
794 console_unlock();
795 for (i = min(ect, ct), plist = unilist; i; i--, list++, plist++) {
796 __put_user(plist->unicode, &list->unicode);
797 __put_user(plist->fontpos, &list->fontpos);
798 }
799 __put_user(ect, uct);
800 kfree(unilist);
801 return ((ect <= ct) ? 0 : -ENOMEM);
802}
803
804/*
805 * Always use USER_MAP. These functions are used by the keyboard,
806 * which shouldn't be affected by G0/G1 switching, etc.
807 * If the user map still contains default values, i.e. the
808 * direct-to-font mapping, then assume user is using Latin1.
809 *
810 * FIXME: at some point we need to decide if we want to lock the table
811 * update element itself via the keyboard_event_lock for consistency with the
812 * keyboard driver as well as the consoles
813 */
814/* may be called during an interrupt */
815u32 conv_8bit_to_uni(unsigned char c)
816{
817 unsigned short uni = translations[USER_MAP][c];
818 return uni == (0xf000 | c) ? c : uni;
819}
820
821int conv_uni_to_8bit(u32 uni)
822{
823 int c;
824 for (c = 0; c < 0x100; c++)
825 if (translations[USER_MAP][c] == uni ||
826 (translations[USER_MAP][c] == (c | 0xf000) && uni == c))
827 return c;
828 return -1;
829}
830
831int
832conv_uni_to_pc(struct vc_data *conp, long ucs)
833{
834 int h;
835 u16 **p1, *p2;
836 struct uni_pagedir *p;
837
838 /* Only 16-bit codes supported at this time */
839 if (ucs > 0xffff)
840 return -4; /* Not found */
841 else if (ucs < 0x20)
842 return -1; /* Not a printable character */
843 else if (ucs == 0xfeff || (ucs >= 0x200b && ucs <= 0x200f))
844 return -2; /* Zero-width space */
845 /*
846 * UNI_DIRECT_BASE indicates the start of the region in the User Zone
847 * which always has a 1:1 mapping to the currently loaded font. The
848 * UNI_DIRECT_MASK indicates the bit span of the region.
849 */
850 else if ((ucs & ~UNI_DIRECT_MASK) == UNI_DIRECT_BASE)
851 return ucs & UNI_DIRECT_MASK;
852
853 if (!*conp->vc_uni_pagedir_loc)
854 return -3;
855
856 p = *conp->vc_uni_pagedir_loc;
857 if ((p1 = p->uni_pgdir[ucs >> 11]) &&
858 (p2 = p1[(ucs >> 6) & 0x1f]) &&
859 (h = p2[ucs & 0x3f]) < MAX_GLYPH)
860 return h;
861
862 return -4; /* not found */
863}
864
865/*
866 * This is called at sys_setup time, after memory and the console are
867 * initialized. It must be possible to call kmalloc(..., GFP_KERNEL)
868 * from this function, hence the call from sys_setup.
869 */
870void __init
871console_map_init(void)
872{
873 int i;
874
875 for (i = 0; i < MAX_NR_CONSOLES; i++)
876 if (vc_cons_allocated(i) && !*vc_cons[i].d->vc_uni_pagedir_loc)
877 con_set_default_unimap(vc_cons[i].d);
878}
879