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/bitfield.h>
27 #include <linux/bits.h>
28 #include <linux/module.h>
29 #include <linux/kd.h>
30 #include <linux/errno.h>
31 #include <linux/mm.h>
32 #include <linux/slab.h>
33 #include <linux/init.h>
34 #include <linux/tty.h>
35 #include <linux/uaccess.h>
36 #include <linux/console.h>
37 #include <linux/consolemap.h>
38 #include <linux/vt_kern.h>
39 #include <linux/string.h>
40
41 static unsigned short translations[][E_TABSZ] = {
42 /* 8-bit Latin-1 mapped to Unicode -- trivial mapping */
43 [LAT1_MAP] = {
44 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
45 0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
46 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
47 0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
48 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
49 0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
50 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
51 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
52 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
53 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
54 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
55 0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
56 0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
57 0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
58 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
59 0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x007f,
60 0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
61 0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
62 0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
63 0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
64 0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
65 0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
66 0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
67 0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
68 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
69 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
70 0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
71 0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
72 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
73 0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
74 0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
75 0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
76 },
77 /* VT100 graphics mapped to Unicode */
78 [GRAF_MAP] = {
79 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
80 0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
81 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
82 0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
83 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
84 0x0028, 0x0029, 0x002a, 0x2192, 0x2190, 0x2191, 0x2193, 0x002f,
85 0x2588, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
86 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
87 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
88 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
89 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
90 0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x00a0,
91 0x25c6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1,
92 0x2591, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba,
93 0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c,
94 0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7, 0x007f,
95 0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
96 0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
97 0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
98 0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
99 0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
100 0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
101 0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
102 0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
103 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
104 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
105 0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
106 0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
107 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
108 0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
109 0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
110 0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
111 },
112 /* IBM Codepage 437 mapped to Unicode */
113 [IBMPC_MAP] = {
114 0x0000, 0x263a, 0x263b, 0x2665, 0x2666, 0x2663, 0x2660, 0x2022,
115 0x25d8, 0x25cb, 0x25d9, 0x2642, 0x2640, 0x266a, 0x266b, 0x263c,
116 0x25b6, 0x25c0, 0x2195, 0x203c, 0x00b6, 0x00a7, 0x25ac, 0x21a8,
117 0x2191, 0x2193, 0x2192, 0x2190, 0x221f, 0x2194, 0x25b2, 0x25bc,
118 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
119 0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
120 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
121 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
122 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
123 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
124 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
125 0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
126 0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
127 0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
128 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
129 0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x2302,
130 0x00c7, 0x00fc, 0x00e9, 0x00e2, 0x00e4, 0x00e0, 0x00e5, 0x00e7,
131 0x00ea, 0x00eb, 0x00e8, 0x00ef, 0x00ee, 0x00ec, 0x00c4, 0x00c5,
132 0x00c9, 0x00e6, 0x00c6, 0x00f4, 0x00f6, 0x00f2, 0x00fb, 0x00f9,
133 0x00ff, 0x00d6, 0x00dc, 0x00a2, 0x00a3, 0x00a5, 0x20a7, 0x0192,
134 0x00e1, 0x00ed, 0x00f3, 0x00fa, 0x00f1, 0x00d1, 0x00aa, 0x00ba,
135 0x00bf, 0x2310, 0x00ac, 0x00bd, 0x00bc, 0x00a1, 0x00ab, 0x00bb,
136 0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556,
137 0x2555, 0x2563, 0x2551, 0x2557, 0x255d, 0x255c, 0x255b, 0x2510,
138 0x2514, 0x2534, 0x252c, 0x251c, 0x2500, 0x253c, 0x255e, 0x255f,
139 0x255a, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256c, 0x2567,
140 0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256b,
141 0x256a, 0x2518, 0x250c, 0x2588, 0x2584, 0x258c, 0x2590, 0x2580,
142 0x03b1, 0x00df, 0x0393, 0x03c0, 0x03a3, 0x03c3, 0x00b5, 0x03c4,
143 0x03a6, 0x0398, 0x03a9, 0x03b4, 0x221e, 0x03c6, 0x03b5, 0x2229,
144 0x2261, 0x00b1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00f7, 0x2248,
145 0x00b0, 0x2219, 0x00b7, 0x221a, 0x207f, 0x00b2, 0x25a0, 0x00a0
146 },
147 /* User mapping -- default to codes for direct font mapping */
148 [USER_MAP] = {
149 0xf000, 0xf001, 0xf002, 0xf003, 0xf004, 0xf005, 0xf006, 0xf007,
150 0xf008, 0xf009, 0xf00a, 0xf00b, 0xf00c, 0xf00d, 0xf00e, 0xf00f,
151 0xf010, 0xf011, 0xf012, 0xf013, 0xf014, 0xf015, 0xf016, 0xf017,
152 0xf018, 0xf019, 0xf01a, 0xf01b, 0xf01c, 0xf01d, 0xf01e, 0xf01f,
153 0xf020, 0xf021, 0xf022, 0xf023, 0xf024, 0xf025, 0xf026, 0xf027,
154 0xf028, 0xf029, 0xf02a, 0xf02b, 0xf02c, 0xf02d, 0xf02e, 0xf02f,
155 0xf030, 0xf031, 0xf032, 0xf033, 0xf034, 0xf035, 0xf036, 0xf037,
156 0xf038, 0xf039, 0xf03a, 0xf03b, 0xf03c, 0xf03d, 0xf03e, 0xf03f,
157 0xf040, 0xf041, 0xf042, 0xf043, 0xf044, 0xf045, 0xf046, 0xf047,
158 0xf048, 0xf049, 0xf04a, 0xf04b, 0xf04c, 0xf04d, 0xf04e, 0xf04f,
159 0xf050, 0xf051, 0xf052, 0xf053, 0xf054, 0xf055, 0xf056, 0xf057,
160 0xf058, 0xf059, 0xf05a, 0xf05b, 0xf05c, 0xf05d, 0xf05e, 0xf05f,
161 0xf060, 0xf061, 0xf062, 0xf063, 0xf064, 0xf065, 0xf066, 0xf067,
162 0xf068, 0xf069, 0xf06a, 0xf06b, 0xf06c, 0xf06d, 0xf06e, 0xf06f,
163 0xf070, 0xf071, 0xf072, 0xf073, 0xf074, 0xf075, 0xf076, 0xf077,
164 0xf078, 0xf079, 0xf07a, 0xf07b, 0xf07c, 0xf07d, 0xf07e, 0xf07f,
165 0xf080, 0xf081, 0xf082, 0xf083, 0xf084, 0xf085, 0xf086, 0xf087,
166 0xf088, 0xf089, 0xf08a, 0xf08b, 0xf08c, 0xf08d, 0xf08e, 0xf08f,
167 0xf090, 0xf091, 0xf092, 0xf093, 0xf094, 0xf095, 0xf096, 0xf097,
168 0xf098, 0xf099, 0xf09a, 0xf09b, 0xf09c, 0xf09d, 0xf09e, 0xf09f,
169 0xf0a0, 0xf0a1, 0xf0a2, 0xf0a3, 0xf0a4, 0xf0a5, 0xf0a6, 0xf0a7,
170 0xf0a8, 0xf0a9, 0xf0aa, 0xf0ab, 0xf0ac, 0xf0ad, 0xf0ae, 0xf0af,
171 0xf0b0, 0xf0b1, 0xf0b2, 0xf0b3, 0xf0b4, 0xf0b5, 0xf0b6, 0xf0b7,
172 0xf0b8, 0xf0b9, 0xf0ba, 0xf0bb, 0xf0bc, 0xf0bd, 0xf0be, 0xf0bf,
173 0xf0c0, 0xf0c1, 0xf0c2, 0xf0c3, 0xf0c4, 0xf0c5, 0xf0c6, 0xf0c7,
174 0xf0c8, 0xf0c9, 0xf0ca, 0xf0cb, 0xf0cc, 0xf0cd, 0xf0ce, 0xf0cf,
175 0xf0d0, 0xf0d1, 0xf0d2, 0xf0d3, 0xf0d4, 0xf0d5, 0xf0d6, 0xf0d7,
176 0xf0d8, 0xf0d9, 0xf0da, 0xf0db, 0xf0dc, 0xf0dd, 0xf0de, 0xf0df,
177 0xf0e0, 0xf0e1, 0xf0e2, 0xf0e3, 0xf0e4, 0xf0e5, 0xf0e6, 0xf0e7,
178 0xf0e8, 0xf0e9, 0xf0ea, 0xf0eb, 0xf0ec, 0xf0ed, 0xf0ee, 0xf0ef,
179 0xf0f0, 0xf0f1, 0xf0f2, 0xf0f3, 0xf0f4, 0xf0f5, 0xf0f6, 0xf0f7,
180 0xf0f8, 0xf0f9, 0xf0fa, 0xf0fb, 0xf0fc, 0xf0fd, 0xf0fe, 0xf0ff
181 }
182 };
183
184 /* The standard kernel character-to-font mappings are not invertible
185 -- this is just a best effort. */
186
187 #define MAX_GLYPH 512 /* Max possible glyph value */
188
189 static enum translation_map inv_translate[MAX_NR_CONSOLES];
190
191 #define UNI_DIRS 32U
192 #define UNI_DIR_ROWS 32U
193 #define UNI_ROW_GLYPHS 64U
194
195 #define UNI_DIR_BITS GENMASK(15, 11)
196 #define UNI_ROW_BITS GENMASK(10, 6)
197 #define UNI_GLYPH_BITS GENMASK( 5, 0)
198
199 #define UNI_DIR(uni) FIELD_GET(UNI_DIR_BITS, (uni))
200 #define UNI_ROW(uni) FIELD_GET(UNI_ROW_BITS, (uni))
201 #define UNI_GLYPH(uni) FIELD_GET(UNI_GLYPH_BITS, (uni))
202
203 #define UNI(dir, row, glyph) (FIELD_PREP(UNI_DIR_BITS, (dir)) | \
204 FIELD_PREP(UNI_ROW_BITS, (row)) | \
205 FIELD_PREP(UNI_GLYPH_BITS, (glyph)))
206
207 /**
208 * struct uni_pagedict -- unicode directory
209 *
210 * @uni_pgdir: 32*32*64 table with glyphs
211 * @refcount: reference count of this structure
212 * @sum: checksum
213 * @inverse_translations: best-effort inverse mapping
214 * @inverse_trans_unicode: best-effort inverse mapping to unicode
215 */
216 struct uni_pagedict {
217 u16 **uni_pgdir[UNI_DIRS];
218 unsigned long refcount;
219 unsigned long sum;
220 unsigned char *inverse_translations[LAST_MAP + 1];
221 u16 *inverse_trans_unicode;
222 };
223
224 static struct uni_pagedict *dflt;
225
set_inverse_transl(struct vc_data * conp,struct uni_pagedict * dict,enum translation_map m)226 static void set_inverse_transl(struct vc_data *conp, struct uni_pagedict *dict,
227 enum translation_map m)
228 {
229 unsigned short *t = translations[m];
230 unsigned char *inv;
231
232 if (!dict)
233 return;
234 inv = dict->inverse_translations[m];
235
236 if (!inv) {
237 inv = dict->inverse_translations[m] = kmalloc(MAX_GLYPH,
238 GFP_KERNEL);
239 if (!inv)
240 return;
241 }
242 memset(inv, 0, MAX_GLYPH);
243
244 for (unsigned int ch = 0; ch < ARRAY_SIZE(translations[m]); ch++) {
245 int glyph = conv_uni_to_pc(conp, t[ch]);
246 if (glyph >= 0 && glyph < MAX_GLYPH && inv[glyph] < 32) {
247 /* prefer '-' above SHY etc. */
248 inv[glyph] = ch;
249 }
250 }
251 }
252
set_inverse_trans_unicode(struct uni_pagedict * dict)253 static void set_inverse_trans_unicode(struct uni_pagedict *dict)
254 {
255 unsigned int d, r, g;
256 u16 *inv;
257
258 if (!dict)
259 return;
260
261 inv = dict->inverse_trans_unicode;
262 if (!inv) {
263 inv = dict->inverse_trans_unicode = kmalloc_array(MAX_GLYPH,
264 sizeof(*inv), GFP_KERNEL);
265 if (!inv)
266 return;
267 }
268 memset(inv, 0, MAX_GLYPH * sizeof(*inv));
269
270 for (d = 0; d < UNI_DIRS; d++) {
271 u16 **dir = dict->uni_pgdir[d];
272 if (!dir)
273 continue;
274 for (r = 0; r < UNI_DIR_ROWS; r++) {
275 u16 *row = dir[r];
276 if (!row)
277 continue;
278 for (g = 0; g < UNI_ROW_GLYPHS; g++) {
279 u16 glyph = row[g];
280 if (glyph < MAX_GLYPH && inv[glyph] < 32)
281 inv[glyph] = UNI(d, r, g);
282 }
283 }
284 }
285 }
286
set_translate(enum translation_map m,struct vc_data * vc)287 unsigned short *set_translate(enum translation_map m, struct vc_data *vc)
288 {
289 inv_translate[vc->vc_num] = m;
290 return translations[m];
291 }
292
293 /*
294 * Inverse translation is impossible for several reasons:
295 * 1. The font<->character maps are not 1-1.
296 * 2. The text may have been written while a different translation map
297 * was active.
298 * Still, it is now possible to a certain extent to cut and paste non-ASCII.
299 */
inverse_translate(const struct vc_data * conp,u16 glyph,bool use_unicode)300 u16 inverse_translate(const struct vc_data *conp, u16 glyph, bool use_unicode)
301 {
302 struct uni_pagedict *p;
303 enum translation_map m;
304
305 if (glyph >= MAX_GLYPH)
306 return 0;
307
308 p = *conp->uni_pagedict_loc;
309 if (!p)
310 return glyph;
311
312 if (use_unicode) {
313 if (!p->inverse_trans_unicode)
314 return glyph;
315
316 return p->inverse_trans_unicode[glyph];
317 }
318
319 m = inv_translate[conp->vc_num];
320 if (!p->inverse_translations[m])
321 return glyph;
322
323 return p->inverse_translations[m][glyph];
324 }
325 EXPORT_SYMBOL_GPL(inverse_translate);
326
update_user_maps(void)327 static void update_user_maps(void)
328 {
329 int i;
330 struct uni_pagedict *p, *q = NULL;
331
332 for (i = 0; i < MAX_NR_CONSOLES; i++) {
333 if (!vc_cons_allocated(i))
334 continue;
335 p = *vc_cons[i].d->uni_pagedict_loc;
336 if (p && p != q) {
337 set_inverse_transl(vc_cons[i].d, p, USER_MAP);
338 set_inverse_trans_unicode(p);
339 q = p;
340 }
341 }
342 }
343
344 /*
345 * Load customizable translation table
346 * arg points to a 256 byte translation table.
347 *
348 * The "old" variants are for translation directly to font (using the
349 * 0xf000-0xf0ff "transparent" Unicodes) whereas the "new" variants set
350 * Unicodes explicitly.
351 */
con_set_trans_old(unsigned char __user * arg)352 int con_set_trans_old(unsigned char __user * arg)
353 {
354 unsigned short inbuf[E_TABSZ];
355 unsigned int i;
356 unsigned char ch;
357
358 for (i = 0; i < ARRAY_SIZE(inbuf); i++) {
359 if (get_user(ch, &arg[i]))
360 return -EFAULT;
361 inbuf[i] = UNI_DIRECT_BASE | ch;
362 }
363
364 console_lock();
365 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
366 update_user_maps();
367 console_unlock();
368 return 0;
369 }
370
con_get_trans_old(unsigned char __user * arg)371 int con_get_trans_old(unsigned char __user * arg)
372 {
373 int i, ch;
374 unsigned short *p = translations[USER_MAP];
375 unsigned char outbuf[E_TABSZ];
376
377 console_lock();
378 for (i = 0; i < ARRAY_SIZE(outbuf); i++)
379 {
380 ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]);
381 outbuf[i] = (ch & ~0xff) ? 0 : ch;
382 }
383 console_unlock();
384
385 return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0;
386 }
387
con_set_trans_new(ushort __user * arg)388 int con_set_trans_new(ushort __user * arg)
389 {
390 unsigned short inbuf[E_TABSZ];
391
392 if (copy_from_user(inbuf, arg, sizeof(inbuf)))
393 return -EFAULT;
394
395 console_lock();
396 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
397 update_user_maps();
398 console_unlock();
399 return 0;
400 }
401
con_get_trans_new(ushort __user * arg)402 int con_get_trans_new(ushort __user * arg)
403 {
404 unsigned short outbuf[E_TABSZ];
405
406 console_lock();
407 memcpy(outbuf, translations[USER_MAP], sizeof(outbuf));
408 console_unlock();
409
410 return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0;
411 }
412
413 /*
414 * Unicode -> current font conversion
415 *
416 * A font has at most 512 chars, usually 256.
417 * But one font position may represent several Unicode chars.
418 * A hashtable is somewhat of a pain to deal with, so use a
419 * "paged table" instead. Simulation has shown the memory cost of
420 * this 3-level paged table scheme to be comparable to a hash table.
421 */
422
423 extern u8 dfont_unicount[]; /* Defined in console_defmap.c */
424 extern u16 dfont_unitable[];
425
con_release_unimap(struct uni_pagedict * dict)426 static void con_release_unimap(struct uni_pagedict *dict)
427 {
428 unsigned int d, r;
429
430 if (dict == dflt)
431 dflt = NULL;
432
433 for (d = 0; d < UNI_DIRS; d++) {
434 u16 **dir = dict->uni_pgdir[d];
435 if (dir != NULL) {
436 for (r = 0; r < UNI_DIR_ROWS; r++)
437 kfree(dir[r]);
438 kfree(dir);
439 }
440 dict->uni_pgdir[d] = NULL;
441 }
442
443 for (r = 0; r < ARRAY_SIZE(dict->inverse_translations); r++) {
444 kfree(dict->inverse_translations[r]);
445 dict->inverse_translations[r] = NULL;
446 }
447
448 kfree(dict->inverse_trans_unicode);
449 dict->inverse_trans_unicode = NULL;
450 }
451
452 /* Caller must hold the console lock */
con_free_unimap(struct vc_data * vc)453 void con_free_unimap(struct vc_data *vc)
454 {
455 struct uni_pagedict *p;
456
457 p = *vc->uni_pagedict_loc;
458 if (!p)
459 return;
460 *vc->uni_pagedict_loc = NULL;
461 if (--p->refcount)
462 return;
463 con_release_unimap(p);
464 kfree(p);
465 }
466
con_unify_unimap(struct vc_data * conp,struct uni_pagedict * dict1)467 static int con_unify_unimap(struct vc_data *conp, struct uni_pagedict *dict1)
468 {
469 struct uni_pagedict *dict2;
470 unsigned int cons, d, r;
471
472 for (cons = 0; cons < MAX_NR_CONSOLES; cons++) {
473 if (!vc_cons_allocated(cons))
474 continue;
475 dict2 = *vc_cons[cons].d->uni_pagedict_loc;
476 if (!dict2 || dict2 == dict1 || dict2->sum != dict1->sum)
477 continue;
478 for (d = 0; d < UNI_DIRS; d++) {
479 u16 **dir1 = dict1->uni_pgdir[d];
480 u16 **dir2 = dict2->uni_pgdir[d];
481 if (!dir1 && !dir2)
482 continue;
483 if (!dir1 || !dir2)
484 break;
485 for (r = 0; r < UNI_DIR_ROWS; r++) {
486 if (!dir1[r] && !dir2[r])
487 continue;
488 if (!dir1[r] || !dir2[r])
489 break;
490 if (memcmp(dir1[r], dir2[r], UNI_ROW_GLYPHS *
491 sizeof(*dir1[r])))
492 break;
493 }
494 if (r < UNI_DIR_ROWS)
495 break;
496 }
497 if (d == UNI_DIRS) {
498 dict2->refcount++;
499 *conp->uni_pagedict_loc = dict2;
500 con_release_unimap(dict1);
501 kfree(dict1);
502 return 1;
503 }
504 }
505 return 0;
506 }
507
508 static int
con_insert_unipair(struct uni_pagedict * p,u_short unicode,u_short fontpos)509 con_insert_unipair(struct uni_pagedict *p, u_short unicode, u_short fontpos)
510 {
511 u16 **dir, *row;
512 unsigned int n;
513
514 n = UNI_DIR(unicode);
515 dir = p->uni_pgdir[n];
516 if (!dir) {
517 dir = p->uni_pgdir[n] = kcalloc(UNI_DIR_ROWS, sizeof(*dir),
518 GFP_KERNEL);
519 if (!dir)
520 return -ENOMEM;
521 }
522
523 n = UNI_ROW(unicode);
524 row = dir[n];
525 if (!row) {
526 row = dir[n] = kmalloc_array(UNI_ROW_GLYPHS, sizeof(*row),
527 GFP_KERNEL);
528 if (!row)
529 return -ENOMEM;
530 /* No glyphs for the characters (yet) */
531 memset(row, 0xff, UNI_ROW_GLYPHS * sizeof(*row));
532 }
533
534 row[UNI_GLYPH(unicode)] = fontpos;
535
536 p->sum += (fontpos << 20U) + unicode;
537
538 return 0;
539 }
540
con_allocate_new(struct vc_data * vc)541 static int con_allocate_new(struct vc_data *vc)
542 {
543 struct uni_pagedict *new, *old = *vc->uni_pagedict_loc;
544
545 new = kzalloc(sizeof(*new), GFP_KERNEL);
546 if (!new)
547 return -ENOMEM;
548
549 new->refcount = 1;
550 *vc->uni_pagedict_loc = new;
551
552 if (old)
553 old->refcount--;
554
555 return 0;
556 }
557
558 /* Caller must hold the lock */
con_do_clear_unimap(struct vc_data * vc)559 static int con_do_clear_unimap(struct vc_data *vc)
560 {
561 struct uni_pagedict *old = *vc->uni_pagedict_loc;
562
563 if (!old || old->refcount > 1)
564 return con_allocate_new(vc);
565
566 old->sum = 0;
567 con_release_unimap(old);
568
569 return 0;
570 }
571
con_clear_unimap(struct vc_data * vc)572 int con_clear_unimap(struct vc_data *vc)
573 {
574 int ret;
575 console_lock();
576 ret = con_do_clear_unimap(vc);
577 console_unlock();
578 return ret;
579 }
580
con_unshare_unimap(struct vc_data * vc,struct uni_pagedict * old)581 static struct uni_pagedict *con_unshare_unimap(struct vc_data *vc,
582 struct uni_pagedict *old)
583 {
584 struct uni_pagedict *new;
585 unsigned int d, r, g;
586 int ret;
587 u16 uni = 0;
588
589 ret = con_allocate_new(vc);
590 if (ret)
591 return ERR_PTR(ret);
592
593 new = *vc->uni_pagedict_loc;
594
595 /*
596 * uni_pgdir is a 32*32*64 table with rows allocated when its first
597 * entry is added. The unicode value must still be incremented for
598 * empty rows. We are copying entries from "old" to "new".
599 */
600 for (d = 0; d < UNI_DIRS; d++) {
601 u16 **dir = old->uni_pgdir[d];
602 if (!dir) {
603 /* Account for empty table */
604 uni += UNI_DIR_ROWS * UNI_ROW_GLYPHS;
605 continue;
606 }
607
608 for (r = 0; r < UNI_DIR_ROWS; r++) {
609 u16 *row = dir[r];
610 if (!row) {
611 /* Account for row of 64 empty entries */
612 uni += UNI_ROW_GLYPHS;
613 continue;
614 }
615
616 for (g = 0; g < UNI_ROW_GLYPHS; g++, uni++) {
617 if (row[g] == 0xffff)
618 continue;
619 /*
620 * Found one, copy entry for unicode uni with
621 * fontpos value row[g].
622 */
623 ret = con_insert_unipair(new, uni, row[g]);
624 if (ret) {
625 old->refcount++;
626 *vc->uni_pagedict_loc = old;
627 con_release_unimap(new);
628 kfree(new);
629 return ERR_PTR(ret);
630 }
631 }
632 }
633 }
634
635 return new;
636 }
637
con_set_unimap(struct vc_data * vc,ushort ct,struct unipair __user * list)638 int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
639 {
640 int err = 0, err1;
641 struct uni_pagedict *dict;
642 struct unipair *unilist, *plist;
643
644 if (!ct)
645 return 0;
646
647 unilist = vmemdup_user(list, array_size(sizeof(*unilist), ct));
648 if (IS_ERR(unilist))
649 return PTR_ERR(unilist);
650
651 console_lock();
652
653 /* Save original vc_unipagdir_loc in case we allocate a new one */
654 dict = *vc->uni_pagedict_loc;
655 if (!dict) {
656 err = -EINVAL;
657 goto out_unlock;
658 }
659
660 if (dict->refcount > 1) {
661 dict = con_unshare_unimap(vc, dict);
662 if (IS_ERR(dict)) {
663 err = PTR_ERR(dict);
664 goto out_unlock;
665 }
666 } else if (dict == dflt) {
667 dflt = NULL;
668 }
669
670 /*
671 * Insert user specified unicode pairs into new table.
672 */
673 for (plist = unilist; ct; ct--, plist++) {
674 err1 = con_insert_unipair(dict, plist->unicode, plist->fontpos);
675 if (err1)
676 err = err1;
677 }
678
679 /*
680 * Merge with fontmaps of any other virtual consoles.
681 */
682 if (con_unify_unimap(vc, dict))
683 goto out_unlock;
684
685 for (enum translation_map m = FIRST_MAP; m <= LAST_MAP; m++)
686 set_inverse_transl(vc, dict, m);
687 set_inverse_trans_unicode(dict);
688
689 out_unlock:
690 console_unlock();
691 kvfree(unilist);
692 return err;
693 }
694
695 /**
696 * con_set_default_unimap - set default unicode map
697 * @vc: the console we are updating
698 *
699 * Loads the unimap for the hardware font, as defined in uni_hash.tbl.
700 * The representation used was the most compact I could come up
701 * with. This routine is executed at video setup, and when the
702 * PIO_FONTRESET ioctl is called.
703 *
704 * The caller must hold the console lock
705 */
con_set_default_unimap(struct vc_data * vc)706 int con_set_default_unimap(struct vc_data *vc)
707 {
708 struct uni_pagedict *dict;
709 unsigned int fontpos, count;
710 int err = 0, err1;
711 u16 *dfont;
712
713 if (dflt) {
714 dict = *vc->uni_pagedict_loc;
715 if (dict == dflt)
716 return 0;
717
718 dflt->refcount++;
719 *vc->uni_pagedict_loc = dflt;
720 if (dict && !--dict->refcount) {
721 con_release_unimap(dict);
722 kfree(dict);
723 }
724 return 0;
725 }
726
727 /* The default font is always 256 characters */
728
729 err = con_do_clear_unimap(vc);
730 if (err)
731 return err;
732
733 dict = *vc->uni_pagedict_loc;
734 dfont = dfont_unitable;
735
736 for (fontpos = 0; fontpos < 256U; fontpos++)
737 for (count = dfont_unicount[fontpos]; count; count--) {
738 err1 = con_insert_unipair(dict, *(dfont++), fontpos);
739 if (err1)
740 err = err1;
741 }
742
743 if (con_unify_unimap(vc, dict)) {
744 dflt = *vc->uni_pagedict_loc;
745 return err;
746 }
747
748 for (enum translation_map m = FIRST_MAP; m <= LAST_MAP; m++)
749 set_inverse_transl(vc, dict, m);
750 set_inverse_trans_unicode(dict);
751 dflt = dict;
752 return err;
753 }
754 EXPORT_SYMBOL(con_set_default_unimap);
755
756 /**
757 * con_copy_unimap - copy unimap between two vts
758 * @dst_vc: target
759 * @src_vc: source
760 *
761 * The caller must hold the console lock when invoking this method
762 */
con_copy_unimap(struct vc_data * dst_vc,struct vc_data * src_vc)763 int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc)
764 {
765 struct uni_pagedict *src;
766
767 if (!*src_vc->uni_pagedict_loc)
768 return -EINVAL;
769 if (*dst_vc->uni_pagedict_loc == *src_vc->uni_pagedict_loc)
770 return 0;
771 con_free_unimap(dst_vc);
772 src = *src_vc->uni_pagedict_loc;
773 src->refcount++;
774 *dst_vc->uni_pagedict_loc = src;
775 return 0;
776 }
777 EXPORT_SYMBOL(con_copy_unimap);
778
779 /*
780 * con_get_unimap - get the unicode map
781 *
782 * Read the console unicode data for this console. Called from the ioctl
783 * handlers.
784 */
con_get_unimap(struct vc_data * vc,ushort ct,ushort __user * uct,struct unipair __user * list)785 int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct,
786 struct unipair __user *list)
787 {
788 ushort ect;
789 struct uni_pagedict *dict;
790 struct unipair *unilist;
791 unsigned int d, r, g;
792 int ret = 0;
793
794 unilist = kvmalloc_array(ct, sizeof(*unilist), GFP_KERNEL);
795 if (!unilist)
796 return -ENOMEM;
797
798 console_lock();
799
800 ect = 0;
801 dict = *vc->uni_pagedict_loc;
802 if (!dict)
803 goto unlock;
804
805 for (d = 0; d < UNI_DIRS; d++) {
806 u16 **dir = dict->uni_pgdir[d];
807 if (!dir)
808 continue;
809
810 for (r = 0; r < UNI_DIR_ROWS; r++) {
811 u16 *row = dir[r];
812 if (!row)
813 continue;
814
815 for (g = 0; g < UNI_ROW_GLYPHS; g++, row++) {
816 if (*row >= MAX_GLYPH)
817 continue;
818 if (ect < ct) {
819 unilist[ect].unicode = UNI(d, r, g);
820 unilist[ect].fontpos = *row;
821 }
822 ect++;
823 }
824 }
825 }
826 unlock:
827 console_unlock();
828 if (copy_to_user(list, unilist, min(ect, ct) * sizeof(*unilist)))
829 ret = -EFAULT;
830 if (put_user(ect, uct))
831 ret = -EFAULT;
832 kvfree(unilist);
833 return ret ? ret : (ect <= ct) ? 0 : -ENOMEM;
834 }
835
836 /*
837 * Always use USER_MAP. These functions are used by the keyboard,
838 * which shouldn't be affected by G0/G1 switching, etc.
839 * If the user map still contains default values, i.e. the
840 * direct-to-font mapping, then assume user is using Latin1.
841 *
842 * FIXME: at some point we need to decide if we want to lock the table
843 * update element itself via the keyboard_event_lock for consistency with the
844 * keyboard driver as well as the consoles
845 */
846 /* may be called during an interrupt */
conv_8bit_to_uni(unsigned char c)847 u32 conv_8bit_to_uni(unsigned char c)
848 {
849 unsigned short uni = translations[USER_MAP][c];
850 return uni == (0xf000 | c) ? c : uni;
851 }
852
conv_uni_to_8bit(u32 uni)853 int conv_uni_to_8bit(u32 uni)
854 {
855 int c;
856 for (c = 0; c < ARRAY_SIZE(translations[USER_MAP]); c++)
857 if (translations[USER_MAP][c] == uni ||
858 (translations[USER_MAP][c] == (c | 0xf000) && uni == c))
859 return c;
860 return -1;
861 }
862
conv_uni_to_pc(struct vc_data * conp,long ucs)863 int conv_uni_to_pc(struct vc_data *conp, long ucs)
864 {
865 struct uni_pagedict *dict;
866 u16 **dir, *row, glyph;
867
868 /* Only 16-bit codes supported at this time */
869 if (ucs > 0xffff)
870 return -4; /* Not found */
871 else if (ucs < 0x20)
872 return -1; /* Not a printable character */
873 else if (ucs == 0xfeff || (ucs >= 0x200b && ucs <= 0x200f))
874 return -2; /* Zero-width space */
875 /*
876 * UNI_DIRECT_BASE indicates the start of the region in the User Zone
877 * which always has a 1:1 mapping to the currently loaded font. The
878 * UNI_DIRECT_MASK indicates the bit span of the region.
879 */
880 else if ((ucs & ~UNI_DIRECT_MASK) == UNI_DIRECT_BASE)
881 return ucs & UNI_DIRECT_MASK;
882
883 dict = *conp->uni_pagedict_loc;
884 if (!dict)
885 return -3;
886
887 dir = dict->uni_pgdir[UNI_DIR(ucs)];
888 if (!dir)
889 return -4;
890
891 row = dir[UNI_ROW(ucs)];
892 if (!row)
893 return -4;
894
895 glyph = row[UNI_GLYPH(ucs)];
896 if (glyph >= MAX_GLYPH)
897 return -4;
898
899 return glyph;
900 }
901
902 /*
903 * This is called at sys_setup time, after memory and the console are
904 * initialized. It must be possible to call kmalloc(..., GFP_KERNEL)
905 * from this function, hence the call from sys_setup.
906 */
907 void __init
console_map_init(void)908 console_map_init(void)
909 {
910 int i;
911
912 for (i = 0; i < MAX_NR_CONSOLES; i++)
913 if (vc_cons_allocated(i) && !*vc_cons[i].d->uni_pagedict_loc)
914 con_set_default_unimap(vc_cons[i].d);
915 }
916
917