projects/linux·blob master · refs

901 lines · 25.8 KiB

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 <[email protected]>, July 1998
11 *
12 * Fix bug in inverse translation. Stanislav Voronyi <[email protected]>, 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
41static 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
189static 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 */
216struct 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
224static struct uni_pagedict *dflt;
225
226static 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
253static 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
287unsigned 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 */
300u16 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}
325EXPORT_SYMBOL_GPL(inverse_translate);
326
327static 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 */
352int 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 guard(console_lock)();
365 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
366 update_user_maps();
367
368 return 0;
369}
370
371int 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 scoped_guard(console_lock)
378 for (i = 0; i < ARRAY_SIZE(outbuf); i++) {
379 ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]);
380 outbuf[i] = (ch & ~0xff) ? 0 : ch;
381 }
382
383 return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0;
384}
385
386int con_set_trans_new(ushort __user * arg)
387{
388 unsigned short inbuf[E_TABSZ];
389
390 if (copy_from_user(inbuf, arg, sizeof(inbuf)))
391 return -EFAULT;
392
393 guard(console_lock)();
394 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
395 update_user_maps();
396
397 return 0;
398}
399
400int con_get_trans_new(ushort __user * arg)
401{
402 unsigned short outbuf[E_TABSZ];
403
404 scoped_guard(console_lock)
405 memcpy(outbuf, translations[USER_MAP], sizeof(outbuf));
406
407 return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0;
408}
409
410/*
411 * Unicode -> current font conversion
412 *
413 * A font has at most 512 chars, usually 256.
414 * But one font position may represent several Unicode chars.
415 * A hashtable is somewhat of a pain to deal with, so use a
416 * "paged table" instead. Simulation has shown the memory cost of
417 * this 3-level paged table scheme to be comparable to a hash table.
418 */
419
420extern u8 dfont_unicount[]; /* Defined in console_defmap.c */
421extern u16 dfont_unitable[];
422
423static void con_release_unimap(struct uni_pagedict *dict)
424{
425 unsigned int d, r;
426
427 if (dict == dflt)
428 dflt = NULL;
429
430 for (d = 0; d < UNI_DIRS; d++) {
431 u16 **dir = dict->uni_pgdir[d];
432 if (dir != NULL) {
433 for (r = 0; r < UNI_DIR_ROWS; r++)
434 kfree(dir[r]);
435 kfree(dir);
436 }
437 dict->uni_pgdir[d] = NULL;
438 }
439
440 for (r = 0; r < ARRAY_SIZE(dict->inverse_translations); r++) {
441 kfree(dict->inverse_translations[r]);
442 dict->inverse_translations[r] = NULL;
443 }
444
445 kfree(dict->inverse_trans_unicode);
446 dict->inverse_trans_unicode = NULL;
447}
448
449/* Caller must hold the console lock */
450void con_free_unimap(struct vc_data *vc)
451{
452 struct uni_pagedict *p;
453
454 p = *vc->uni_pagedict_loc;
455 if (!p)
456 return;
457 *vc->uni_pagedict_loc = NULL;
458 if (--p->refcount)
459 return;
460 con_release_unimap(p);
461 kfree(p);
462}
463
464static int con_unify_unimap(struct vc_data *conp, struct uni_pagedict *dict1)
465{
466 struct uni_pagedict *dict2;
467 unsigned int cons, d, r;
468
469 for (cons = 0; cons < MAX_NR_CONSOLES; cons++) {
470 if (!vc_cons_allocated(cons))
471 continue;
472 dict2 = *vc_cons[cons].d->uni_pagedict_loc;
473 if (!dict2 || dict2 == dict1 || dict2->sum != dict1->sum)
474 continue;
475 for (d = 0; d < UNI_DIRS; d++) {
476 u16 **dir1 = dict1->uni_pgdir[d];
477 u16 **dir2 = dict2->uni_pgdir[d];
478 if (!dir1 && !dir2)
479 continue;
480 if (!dir1 || !dir2)
481 break;
482 for (r = 0; r < UNI_DIR_ROWS; r++) {
483 if (!dir1[r] && !dir2[r])
484 continue;
485 if (!dir1[r] || !dir2[r])
486 break;
487 if (memcmp(dir1[r], dir2[r], UNI_ROW_GLYPHS *
488 sizeof(*dir1[r])))
489 break;
490 }
491 if (r < UNI_DIR_ROWS)
492 break;
493 }
494 if (d == UNI_DIRS) {
495 dict2->refcount++;
496 *conp->uni_pagedict_loc = dict2;
497 con_release_unimap(dict1);
498 kfree(dict1);
499 return 1;
500 }
501 }
502 return 0;
503}
504
505static int
506con_insert_unipair(struct uni_pagedict *p, u_short unicode, u_short fontpos)
507{
508 u16 **dir, *row;
509 unsigned int n;
510
511 n = UNI_DIR(unicode);
512 dir = p->uni_pgdir[n];
513 if (!dir) {
514 dir = p->uni_pgdir[n] = kcalloc(UNI_DIR_ROWS, sizeof(*dir),
515 GFP_KERNEL);
516 if (!dir)
517 return -ENOMEM;
518 }
519
520 n = UNI_ROW(unicode);
521 row = dir[n];
522 if (!row) {
523 row = dir[n] = kmalloc_array(UNI_ROW_GLYPHS, sizeof(*row),
524 GFP_KERNEL);
525 if (!row)
526 return -ENOMEM;
527 /* No glyphs for the characters (yet) */
528 memset(row, 0xff, UNI_ROW_GLYPHS * sizeof(*row));
529 }
530
531 row[UNI_GLYPH(unicode)] = fontpos;
532
533 p->sum += (fontpos << 20U) + unicode;
534
535 return 0;
536}
537
538static int con_allocate_new(struct vc_data *vc)
539{
540 struct uni_pagedict *new, *old = *vc->uni_pagedict_loc;
541
542 new = kzalloc_obj(*new);
543 if (!new)
544 return -ENOMEM;
545
546 new->refcount = 1;
547 *vc->uni_pagedict_loc = new;
548
549 if (old)
550 old->refcount--;
551
552 return 0;
553}
554
555/* Caller must hold the lock */
556static int con_do_clear_unimap(struct vc_data *vc)
557{
558 struct uni_pagedict *old = *vc->uni_pagedict_loc;
559
560 if (!old || old->refcount > 1)
561 return con_allocate_new(vc);
562
563 old->sum = 0;
564 con_release_unimap(old);
565
566 return 0;
567}
568
569int con_clear_unimap(struct vc_data *vc)
570{
571 guard(console_lock)();
572 return con_do_clear_unimap(vc);
573}
574
575static struct uni_pagedict *con_unshare_unimap(struct vc_data *vc,
576 struct uni_pagedict *old)
577{
578 struct uni_pagedict *new;
579 unsigned int d, r, g;
580 int ret;
581 u16 uni = 0;
582
583 ret = con_allocate_new(vc);
584 if (ret)
585 return ERR_PTR(ret);
586
587 new = *vc->uni_pagedict_loc;
588
589 /*
590 * uni_pgdir is a 32*32*64 table with rows allocated when its first
591 * entry is added. The unicode value must still be incremented for
592 * empty rows. We are copying entries from "old" to "new".
593 */
594 for (d = 0; d < UNI_DIRS; d++) {
595 u16 **dir = old->uni_pgdir[d];
596 if (!dir) {
597 /* Account for empty table */
598 uni += UNI_DIR_ROWS * UNI_ROW_GLYPHS;
599 continue;
600 }
601
602 for (r = 0; r < UNI_DIR_ROWS; r++) {
603 u16 *row = dir[r];
604 if (!row) {
605 /* Account for row of 64 empty entries */
606 uni += UNI_ROW_GLYPHS;
607 continue;
608 }
609
610 for (g = 0; g < UNI_ROW_GLYPHS; g++, uni++) {
611 if (row[g] == 0xffff)
612 continue;
613 /*
614 * Found one, copy entry for unicode uni with
615 * fontpos value row[g].
616 */
617 ret = con_insert_unipair(new, uni, row[g]);
618 if (ret) {
619 old->refcount++;
620 *vc->uni_pagedict_loc = old;
621 con_release_unimap(new);
622 kfree(new);
623 return ERR_PTR(ret);
624 }
625 }
626 }
627 }
628
629 return new;
630}
631
632int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
633{
634 struct uni_pagedict *dict;
635 struct unipair *plist;
636 int err = 0;
637
638 if (!ct)
639 return 0;
640
641 struct unipair *unilist __free(kvfree) = vmemdup_array_user(list, ct, sizeof(*unilist));
642 if (IS_ERR(unilist))
643 return PTR_ERR(unilist);
644
645 guard(console_lock)();
646
647 /* Save original vc_unipagdir_loc in case we allocate a new one */
648 dict = *vc->uni_pagedict_loc;
649 if (!dict)
650 return -EINVAL;
651
652 if (dict->refcount > 1) {
653 dict = con_unshare_unimap(vc, dict);
654 if (IS_ERR(dict))
655 return PTR_ERR(dict);
656 } else if (dict == dflt) {
657 dflt = NULL;
658 }
659
660 /*
661 * Insert user specified unicode pairs into new table.
662 */
663 for (plist = unilist; ct; ct--, plist++) {
664 int err1 = con_insert_unipair(dict, plist->unicode, plist->fontpos);
665 if (err1)
666 err = err1;
667 }
668
669 /*
670 * Merge with fontmaps of any other virtual consoles.
671 */
672 if (con_unify_unimap(vc, dict))
673 return err;
674
675 for (enum translation_map m = FIRST_MAP; m <= LAST_MAP; m++)
676 set_inverse_transl(vc, dict, m);
677 set_inverse_trans_unicode(dict);
678
679 return err;
680}
681
682/**
683 * con_set_default_unimap - set default unicode map
684 * @vc: the console we are updating
685 *
686 * Loads the unimap for the hardware font, as defined in uni_hash.tbl.
687 * The representation used was the most compact I could come up
688 * with. This routine is executed at video setup, and when the
689 * PIO_FONTRESET ioctl is called.
690 *
691 * The caller must hold the console lock
692 */
693int con_set_default_unimap(struct vc_data *vc)
694{
695 struct uni_pagedict *dict;
696 unsigned int fontpos, count;
697 int err = 0, err1;
698 u16 *dfont;
699
700 if (dflt) {
701 dict = *vc->uni_pagedict_loc;
702 if (dict == dflt)
703 return 0;
704
705 dflt->refcount++;
706 *vc->uni_pagedict_loc = dflt;
707 if (dict && !--dict->refcount) {
708 con_release_unimap(dict);
709 kfree(dict);
710 }
711 return 0;
712 }
713
714 /* The default font is always 256 characters */
715
716 err = con_do_clear_unimap(vc);
717 if (err)
718 return err;
719
720 dict = *vc->uni_pagedict_loc;
721 dfont = dfont_unitable;
722
723 for (fontpos = 0; fontpos < 256U; fontpos++)
724 for (count = dfont_unicount[fontpos]; count; count--) {
725 err1 = con_insert_unipair(dict, *(dfont++), fontpos);
726 if (err1)
727 err = err1;
728 }
729
730 if (con_unify_unimap(vc, dict)) {
731 dflt = *vc->uni_pagedict_loc;
732 return err;
733 }
734
735 for (enum translation_map m = FIRST_MAP; m <= LAST_MAP; m++)
736 set_inverse_transl(vc, dict, m);
737 set_inverse_trans_unicode(dict);
738 dflt = dict;
739 return err;
740}
741EXPORT_SYMBOL(con_set_default_unimap);
742
743/**
744 * con_copy_unimap - copy unimap between two vts
745 * @dst_vc: target
746 * @src_vc: source
747 *
748 * The caller must hold the console lock when invoking this method
749 */
750int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc)
751{
752 struct uni_pagedict *src;
753
754 if (!*src_vc->uni_pagedict_loc)
755 return -EINVAL;
756 if (*dst_vc->uni_pagedict_loc == *src_vc->uni_pagedict_loc)
757 return 0;
758 con_free_unimap(dst_vc);
759 src = *src_vc->uni_pagedict_loc;
760 src->refcount++;
761 *dst_vc->uni_pagedict_loc = src;
762 return 0;
763}
764EXPORT_SYMBOL(con_copy_unimap);
765
766/*
767 * con_get_unimap - get the unicode map
768 *
769 * Read the console unicode data for this console. Called from the ioctl
770 * handlers.
771 */
772int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct,
773 struct unipair __user *list)
774{
775 ushort ect;
776 struct uni_pagedict *dict;
777 unsigned int d, r, g;
778
779 struct unipair *unilist __free(kvfree) = kvmalloc_objs(*unilist, ct,
780 GFP_KERNEL);
781 if (!unilist)
782 return -ENOMEM;
783
784 scoped_guard(console_lock) {
785 ect = 0;
786 dict = *vc->uni_pagedict_loc;
787 if (!dict)
788 break;
789
790 for (d = 0; d < UNI_DIRS; d++) {
791 u16 **dir = dict->uni_pgdir[d];
792 if (!dir)
793 continue;
794
795 for (r = 0; r < UNI_DIR_ROWS; r++) {
796 u16 *row = dir[r];
797 if (!row)
798 continue;
799
800 for (g = 0; g < UNI_ROW_GLYPHS; g++, row++) {
801 if (*row >= MAX_GLYPH)
802 continue;
803 if (ect < ct) {
804 unilist[ect].unicode = UNI(d, r, g);
805 unilist[ect].fontpos = *row;
806 }
807 ect++;
808 }
809 }
810 }
811 }
812
813 if (copy_to_user(list, unilist, min(ect, ct) * sizeof(*unilist)))
814 return -EFAULT;
815 if (put_user(ect, uct))
816 return -EFAULT;
817 if (ect > ct)
818 return -ENOMEM;
819
820 return 0;
821}
822
823/*
824 * Always use USER_MAP. These functions are used by the keyboard,
825 * which shouldn't be affected by G0/G1 switching, etc.
826 * If the user map still contains default values, i.e. the
827 * direct-to-font mapping, then assume user is using Latin1.
828 *
829 * FIXME: at some point we need to decide if we want to lock the table
830 * update element itself via the keyboard_event_lock for consistency with the
831 * keyboard driver as well as the consoles
832 */
833/* may be called during an interrupt */
834u32 conv_8bit_to_uni(unsigned char c)
835{
836 unsigned short uni = translations[USER_MAP][c];
837 return uni == (0xf000 | c) ? c : uni;
838}
839
840int conv_uni_to_8bit(u32 uni)
841{
842 int c;
843 for (c = 0; c < ARRAY_SIZE(translations[USER_MAP]); c++)
844 if (translations[USER_MAP][c] == uni ||
845 (translations[USER_MAP][c] == (c | 0xf000) && uni == c))
846 return c;
847 return -1;
848}
849
850int conv_uni_to_pc(struct vc_data *conp, long ucs)
851{
852 struct uni_pagedict *dict;
853 u16 **dir, *row, glyph;
854
855 /* Only 16-bit codes supported at this time */
856 if (ucs > 0xffff)
857 return -4; /* Not found */
858 else if (ucs < 0x20)
859 return -1; /* Not a printable character */
860 /*
861 * UNI_DIRECT_BASE indicates the start of the region in the User Zone
862 * which always has a 1:1 mapping to the currently loaded font. The
863 * UNI_DIRECT_MASK indicates the bit span of the region.
864 */
865 else if ((ucs & ~UNI_DIRECT_MASK) == UNI_DIRECT_BASE)
866 return ucs & UNI_DIRECT_MASK;
867
868 dict = *conp->uni_pagedict_loc;
869 if (!dict)
870 return -3;
871
872 dir = dict->uni_pgdir[UNI_DIR(ucs)];
873 if (!dir)
874 return -4;
875
876 row = dir[UNI_ROW(ucs)];
877 if (!row)
878 return -4;
879
880 glyph = row[UNI_GLYPH(ucs)];
881 if (glyph >= MAX_GLYPH)
882 return -4;
883
884 return glyph;
885}
886
887/*
888 * This is called at sys_setup time, after memory and the console are
889 * initialized. It must be possible to call kmalloc(..., GFP_KERNEL)
890 * from this function, hence the call from sys_setup.
891 */
892void __init
893console_map_init(void)
894{
895 int i;
896
897 for (i = 0; i < MAX_NR_CONSOLES; i++)
898 if (vc_cons_allocated(i) && !*vc_cons[i].d->uni_pagedict_loc)
899 con_set_default_unimap(vc_cons[i].d);
900}
901