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 39 static unsigned short translations[][256] = { 40 /* 8-bit Latin-1 mapped to Unicode -- trivial mapping */ 41 [LAT1_MAP] = { 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 [GRAF_MAP] = { 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 [IBMPC_MAP] = { 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 [USER_MAP] = { 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 */ 186 187 static enum translation_map inv_translate[MAX_NR_CONSOLES]; 188 189 #define UNI_DIRS 32U 190 #define UNI_DIR_ROWS 32U 191 #define UNI_ROW_GLYPHS 64U 192 193 #define UNI_DIR(uni) ( (uni) >> 11) 194 #define UNI_ROW(uni) (((uni) & GENMASK(10, 6)) >> 6) 195 #define UNI_GLYPH(uni) ( (uni) & GENMASK( 5, 0)) 196 #define UNI(dir, row, glyph) (((dir) << 11) | ((row) << 6) | (glyph)) 197 198 /** 199 * struct uni_pagedict -- unicode directory 200 * 201 * @uni_pgdir: 32*32*64 table with glyphs 202 * @refcount: reference count of this structure 203 * @sum: checksum 204 * @inverse_translations: best-effort inverse mapping 205 * @inverse_trans_unicode: best-effort inverse mapping to unicode 206 */ 207 struct uni_pagedict { 208 u16 **uni_pgdir[UNI_DIRS]; 209 unsigned long refcount; 210 unsigned long sum; 211 unsigned char *inverse_translations[LAST_MAP + 1]; 212 u16 *inverse_trans_unicode; 213 }; 214 215 static struct uni_pagedict *dflt; 216 217 static void set_inverse_transl(struct vc_data *conp, struct uni_pagedict *p, 218 enum translation_map m) 219 { 220 int j, glyph; 221 unsigned short *t = translations[m]; 222 unsigned char *q; 223 224 if (!p) 225 return; 226 q = p->inverse_translations[m]; 227 228 if (!q) { 229 q = p->inverse_translations[m] = kmalloc(MAX_GLYPH, GFP_KERNEL); 230 if (!q) 231 return; 232 } 233 memset(q, 0, MAX_GLYPH); 234 235 for (j = 0; j < E_TABSZ; j++) { 236 glyph = conv_uni_to_pc(conp, t[j]); 237 if (glyph >= 0 && glyph < MAX_GLYPH && q[glyph] < 32) { 238 /* prefer '-' above SHY etc. */ 239 q[glyph] = j; 240 } 241 } 242 } 243 244 static void set_inverse_trans_unicode(struct vc_data *conp, 245 struct uni_pagedict *p) 246 { 247 unsigned int d, r, g; 248 u16 *inv; 249 250 if (!p) 251 return; 252 253 inv = p->inverse_trans_unicode; 254 if (!inv) { 255 inv = p->inverse_trans_unicode = kmalloc_array(MAX_GLYPH, 256 sizeof(*inv), GFP_KERNEL); 257 if (!inv) 258 return; 259 } 260 memset(inv, 0, MAX_GLYPH * sizeof(*inv)); 261 262 for (d = 0; d < UNI_DIRS; d++) { 263 u16 **dir = p->uni_pgdir[d]; 264 if (!dir) 265 continue; 266 for (r = 0; r < UNI_DIR_ROWS; r++) { 267 u16 *row = dir[r]; 268 if (!row) 269 continue; 270 for (g = 0; g < UNI_ROW_GLYPHS; g++) { 271 u16 glyph = row[g]; 272 if (glyph < MAX_GLYPH && inv[glyph] < 32) 273 inv[glyph] = UNI(d, r, g); 274 } 275 } 276 } 277 } 278 279 unsigned short *set_translate(enum translation_map m, struct vc_data *vc) 280 { 281 inv_translate[vc->vc_num] = m; 282 return translations[m]; 283 } 284 285 /* 286 * Inverse translation is impossible for several reasons: 287 * 1. The font<->character maps are not 1-1. 288 * 2. The text may have been written while a different translation map 289 * was active. 290 * Still, it is now possible to a certain extent to cut and paste non-ASCII. 291 */ 292 u16 inverse_translate(const struct vc_data *conp, u16 glyph, bool use_unicode) 293 { 294 struct uni_pagedict *p; 295 enum translation_map m; 296 297 if (glyph >= MAX_GLYPH) 298 return 0; 299 300 p = *conp->vc_uni_pagedir_loc; 301 if (!p) 302 return glyph; 303 304 if (use_unicode) { 305 if (!p->inverse_trans_unicode) 306 return glyph; 307 308 return p->inverse_trans_unicode[glyph]; 309 } 310 311 m = inv_translate[conp->vc_num]; 312 if (!p->inverse_translations[m]) 313 return glyph; 314 315 return p->inverse_translations[m][glyph]; 316 } 317 EXPORT_SYMBOL_GPL(inverse_translate); 318 319 static void update_user_maps(void) 320 { 321 int i; 322 struct uni_pagedict *p, *q = NULL; 323 324 for (i = 0; i < MAX_NR_CONSOLES; i++) { 325 if (!vc_cons_allocated(i)) 326 continue; 327 p = *vc_cons[i].d->vc_uni_pagedir_loc; 328 if (p && p != q) { 329 set_inverse_transl(vc_cons[i].d, p, USER_MAP); 330 set_inverse_trans_unicode(vc_cons[i].d, p); 331 q = p; 332 } 333 } 334 } 335 336 /* 337 * Load customizable translation table 338 * arg points to a 256 byte translation table. 339 * 340 * The "old" variants are for translation directly to font (using the 341 * 0xf000-0xf0ff "transparent" Unicodes) whereas the "new" variants set 342 * Unicodes explicitly. 343 */ 344 int con_set_trans_old(unsigned char __user * arg) 345 { 346 int i; 347 unsigned short inbuf[E_TABSZ]; 348 unsigned char ubuf[E_TABSZ]; 349 350 if (copy_from_user(ubuf, arg, E_TABSZ)) 351 return -EFAULT; 352 353 for (i = 0; i < E_TABSZ ; i++) 354 inbuf[i] = UNI_DIRECT_BASE | ubuf[i]; 355 356 console_lock(); 357 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf)); 358 update_user_maps(); 359 console_unlock(); 360 return 0; 361 } 362 363 int con_get_trans_old(unsigned char __user * arg) 364 { 365 int i, ch; 366 unsigned short *p = translations[USER_MAP]; 367 unsigned char outbuf[E_TABSZ]; 368 369 console_lock(); 370 for (i = 0; i < E_TABSZ ; i++) 371 { 372 ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]); 373 outbuf[i] = (ch & ~0xff) ? 0 : ch; 374 } 375 console_unlock(); 376 377 return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0; 378 } 379 380 int con_set_trans_new(ushort __user * arg) 381 { 382 unsigned short inbuf[E_TABSZ]; 383 384 if (copy_from_user(inbuf, arg, sizeof(inbuf))) 385 return -EFAULT; 386 387 console_lock(); 388 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf)); 389 update_user_maps(); 390 console_unlock(); 391 return 0; 392 } 393 394 int con_get_trans_new(ushort __user * arg) 395 { 396 unsigned short outbuf[E_TABSZ]; 397 398 console_lock(); 399 memcpy(outbuf, translations[USER_MAP], sizeof(outbuf)); 400 console_unlock(); 401 402 return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0; 403 } 404 405 /* 406 * Unicode -> current font conversion 407 * 408 * A font has at most 512 chars, usually 256. 409 * But one font position may represent several Unicode chars. 410 * A hashtable is somewhat of a pain to deal with, so use a 411 * "paged table" instead. Simulation has shown the memory cost of 412 * this 3-level paged table scheme to be comparable to a hash table. 413 */ 414 415 extern u8 dfont_unicount[]; /* Defined in console_defmap.c */ 416 extern u16 dfont_unitable[]; 417 418 static void con_release_unimap(struct uni_pagedict *dict) 419 { 420 unsigned int d, r; 421 422 if (dict == dflt) 423 dflt = NULL; 424 425 for (d = 0; d < UNI_DIRS; d++) { 426 u16 **dir = dict->uni_pgdir[d]; 427 if (dir != NULL) { 428 for (r = 0; r < UNI_DIR_ROWS; r++) 429 kfree(dir[r]); 430 kfree(dir); 431 } 432 dict->uni_pgdir[d] = NULL; 433 } 434 435 for (r = 0; r < ARRAY_SIZE(dict->inverse_translations); r++) { 436 kfree(dict->inverse_translations[r]); 437 dict->inverse_translations[r] = NULL; 438 } 439 440 kfree(dict->inverse_trans_unicode); 441 dict->inverse_trans_unicode = NULL; 442 } 443 444 /* Caller must hold the console lock */ 445 void con_free_unimap(struct vc_data *vc) 446 { 447 struct uni_pagedict *p; 448 449 p = *vc->vc_uni_pagedir_loc; 450 if (!p) 451 return; 452 *vc->vc_uni_pagedir_loc = NULL; 453 if (--p->refcount) 454 return; 455 con_release_unimap(p); 456 kfree(p); 457 } 458 459 static int con_unify_unimap(struct vc_data *conp, struct uni_pagedict *dict1) 460 { 461 struct uni_pagedict *dict2; 462 unsigned int cons, d, r; 463 464 for (cons = 0; cons < MAX_NR_CONSOLES; cons++) { 465 if (!vc_cons_allocated(cons)) 466 continue; 467 dict2 = *vc_cons[cons].d->vc_uni_pagedir_loc; 468 if (!dict2 || dict2 == dict1 || dict2->sum != dict1->sum) 469 continue; 470 for (d = 0; d < UNI_DIRS; d++) { 471 u16 **dir1 = dict1->uni_pgdir[d]; 472 u16 **dir2 = dict2->uni_pgdir[d]; 473 if (!dir1 && !dir2) 474 continue; 475 if (!dir1 || !dir2) 476 break; 477 for (r = 0; r < UNI_DIR_ROWS; r++) { 478 if (!dir1[r] && !dir2[r]) 479 continue; 480 if (!dir1[r] || !dir2[r]) 481 break; 482 if (memcmp(dir1[r], dir2[r], UNI_ROW_GLYPHS * 483 sizeof(*dir1[r]))) 484 break; 485 } 486 if (r < UNI_DIR_ROWS) 487 break; 488 } 489 if (d == UNI_DIRS) { 490 dict2->refcount++; 491 *conp->vc_uni_pagedir_loc = dict2; 492 con_release_unimap(dict1); 493 kfree(dict1); 494 return 1; 495 } 496 } 497 return 0; 498 } 499 500 static int 501 con_insert_unipair(struct uni_pagedict *p, u_short unicode, u_short fontpos) 502 { 503 u16 **dir, *row; 504 unsigned int n; 505 506 n = UNI_DIR(unicode); 507 dir = p->uni_pgdir[n]; 508 if (!dir) { 509 dir = p->uni_pgdir[n] = kcalloc(UNI_DIR_ROWS, sizeof(*dir), 510 GFP_KERNEL); 511 if (!dir) 512 return -ENOMEM; 513 } 514 515 n = UNI_ROW(unicode); 516 row = dir[n]; 517 if (!row) { 518 row = dir[n] = kmalloc_array(UNI_ROW_GLYPHS, sizeof(*row), 519 GFP_KERNEL); 520 if (!row) 521 return -ENOMEM; 522 /* No glyphs for the characters (yet) */ 523 memset(row, 0xff, UNI_ROW_GLYPHS * sizeof(*row)); 524 } 525 526 row[UNI_GLYPH(unicode)] = fontpos; 527 528 p->sum += (fontpos << 20U) + unicode; 529 530 return 0; 531 } 532 533 /* Caller must hold the lock */ 534 static int con_do_clear_unimap(struct vc_data *vc) 535 { 536 struct uni_pagedict *old = *vc->vc_uni_pagedir_loc; 537 538 if (!old || old->refcount > 1) { 539 struct uni_pagedict *new = kzalloc(sizeof(*new), GFP_KERNEL); 540 if (!new) 541 return -ENOMEM; 542 543 new->refcount = 1; 544 *vc->vc_uni_pagedir_loc = new; 545 546 if (old) 547 old->refcount--; 548 } else { 549 if (old == dflt) 550 dflt = NULL; 551 old->sum = 0; 552 con_release_unimap(old); 553 } 554 555 return 0; 556 } 557 558 int con_clear_unimap(struct vc_data *vc) 559 { 560 int ret; 561 console_lock(); 562 ret = con_do_clear_unimap(vc); 563 console_unlock(); 564 return ret; 565 } 566 567 static struct uni_pagedict *con_unshare_unimap(struct vc_data *vc, 568 struct uni_pagedict *old) 569 { 570 struct uni_pagedict *new; 571 unsigned int d, r, g; 572 int ret; 573 u16 uni = 0; 574 575 ret = con_do_clear_unimap(vc); 576 if (ret) 577 return ERR_PTR(ret); 578 579 /* 580 * Since refcount was > 1, con_clear_unimap() allocated a new 581 * uni_pagedict for this vc. Re: old != new 582 */ 583 new = *vc->vc_uni_pagedir_loc; 584 585 /* 586 * uni_pgdir is a 32*32*64 table with rows allocated when its first 587 * entry is added. The unicode value must still be incremented for 588 * empty rows. We are copying entries from "old" to "new". 589 */ 590 for (d = 0; d < UNI_DIRS; d++) { 591 u16 **dir = old->uni_pgdir[d]; 592 if (!dir) { 593 /* Account for empty table */ 594 uni += UNI_DIR_ROWS * UNI_ROW_GLYPHS; 595 continue; 596 } 597 598 for (r = 0; r < UNI_DIR_ROWS; r++) { 599 u16 *row = dir[r]; 600 if (!row) { 601 /* Account for row of 64 empty entries */ 602 uni += UNI_ROW_GLYPHS; 603 continue; 604 } 605 606 for (g = 0; g < UNI_ROW_GLYPHS; g++, uni++) { 607 if (row[g] == 0xffff) 608 continue; 609 /* 610 * Found one, copy entry for unicode uni with 611 * fontpos value row[g]. 612 */ 613 ret = con_insert_unipair(new, uni, row[g]); 614 if (ret) { 615 old->refcount++; 616 *vc->vc_uni_pagedir_loc = old; 617 con_release_unimap(new); 618 kfree(new); 619 return ERR_PTR(ret); 620 } 621 } 622 } 623 } 624 625 return new; 626 } 627 628 int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list) 629 { 630 int err = 0, err1; 631 struct uni_pagedict *dict; 632 struct unipair *unilist, *plist; 633 634 if (!ct) 635 return 0; 636 637 unilist = vmemdup_user(list, array_size(sizeof(*unilist), ct)); 638 if (IS_ERR(unilist)) 639 return PTR_ERR(unilist); 640 641 console_lock(); 642 643 /* Save original vc_unipagdir_loc in case we allocate a new one */ 644 dict = *vc->vc_uni_pagedir_loc; 645 if (!dict) { 646 err = -EINVAL; 647 goto out_unlock; 648 } 649 650 if (dict->refcount > 1) { 651 dict = con_unshare_unimap(vc, dict); 652 if (IS_ERR(dict)) { 653 err = PTR_ERR(dict); 654 goto out_unlock; 655 } 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 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 goto out_unlock; 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(vc, dict); 678 679 out_unlock: 680 console_unlock(); 681 kvfree(unilist); 682 return err; 683 } 684 685 /** 686 * con_set_default_unimap - set default unicode map 687 * @vc: the console we are updating 688 * 689 * Loads the unimap for the hardware font, as defined in uni_hash.tbl. 690 * The representation used was the most compact I could come up 691 * with. This routine is executed at video setup, and when the 692 * PIO_FONTRESET ioctl is called. 693 * 694 * The caller must hold the console lock 695 */ 696 int con_set_default_unimap(struct vc_data *vc) 697 { 698 struct uni_pagedict *dict; 699 unsigned int fontpos, count; 700 int err = 0, err1; 701 u16 *dfont; 702 703 if (dflt) { 704 dict = *vc->vc_uni_pagedir_loc; 705 if (dict == dflt) 706 return 0; 707 708 dflt->refcount++; 709 *vc->vc_uni_pagedir_loc = dflt; 710 if (dict && !--dict->refcount) { 711 con_release_unimap(dict); 712 kfree(dict); 713 } 714 return 0; 715 } 716 717 /* The default font is always 256 characters */ 718 719 err = con_do_clear_unimap(vc); 720 if (err) 721 return err; 722 723 dict = *vc->vc_uni_pagedir_loc; 724 dfont = dfont_unitable; 725 726 for (fontpos = 0; fontpos < 256U; fontpos++) 727 for (count = dfont_unicount[fontpos]; count; count--) { 728 err1 = con_insert_unipair(dict, *(dfont++), fontpos); 729 if (err1) 730 err = err1; 731 } 732 733 if (con_unify_unimap(vc, dict)) { 734 dflt = *vc->vc_uni_pagedir_loc; 735 return err; 736 } 737 738 for (enum translation_map m = FIRST_MAP; m <= LAST_MAP; m++) 739 set_inverse_transl(vc, dict, m); 740 set_inverse_trans_unicode(vc, dict); 741 dflt = dict; 742 return err; 743 } 744 EXPORT_SYMBOL(con_set_default_unimap); 745 746 /** 747 * con_copy_unimap - copy unimap between two vts 748 * @dst_vc: target 749 * @src_vc: source 750 * 751 * The caller must hold the console lock when invoking this method 752 */ 753 int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc) 754 { 755 struct uni_pagedict *src; 756 757 if (!*src_vc->vc_uni_pagedir_loc) 758 return -EINVAL; 759 if (*dst_vc->vc_uni_pagedir_loc == *src_vc->vc_uni_pagedir_loc) 760 return 0; 761 con_free_unimap(dst_vc); 762 src = *src_vc->vc_uni_pagedir_loc; 763 src->refcount++; 764 *dst_vc->vc_uni_pagedir_loc = src; 765 return 0; 766 } 767 EXPORT_SYMBOL(con_copy_unimap); 768 769 /* 770 * con_get_unimap - get the unicode map 771 * 772 * Read the console unicode data for this console. Called from the ioctl 773 * handlers. 774 */ 775 int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, 776 struct unipair __user *list) 777 { 778 ushort ect; 779 struct uni_pagedict *dict; 780 struct unipair *unilist; 781 unsigned int d, r, g; 782 int ret = 0; 783 784 unilist = kvmalloc_array(ct, sizeof(*unilist), GFP_KERNEL); 785 if (!unilist) 786 return -ENOMEM; 787 788 console_lock(); 789 790 ect = 0; 791 dict = *vc->vc_uni_pagedir_loc; 792 if (!dict) 793 goto unlock; 794 795 for (d = 0; d < UNI_DIRS; d++) { 796 u16 **dir = dict->uni_pgdir[d]; 797 if (!dir) 798 continue; 799 800 for (r = 0; r < UNI_DIR_ROWS; r++) { 801 u16 *row = dir[r]; 802 if (!row) 803 continue; 804 805 for (g = 0; g < UNI_ROW_GLYPHS; g++, row++) { 806 if (*row >= MAX_GLYPH) 807 continue; 808 if (ect < ct) { 809 unilist[ect].unicode = UNI(d, r, g); 810 unilist[ect].fontpos = *row; 811 } 812 ect++; 813 } 814 } 815 } 816 unlock: 817 console_unlock(); 818 if (copy_to_user(list, unilist, min(ect, ct) * sizeof(*unilist))) 819 ret = -EFAULT; 820 if (put_user(ect, uct)) 821 ret = -EFAULT; 822 kvfree(unilist); 823 return ret ? ret : (ect <= ct) ? 0 : -ENOMEM; 824 } 825 826 /* 827 * Always use USER_MAP. These functions are used by the keyboard, 828 * which shouldn't be affected by G0/G1 switching, etc. 829 * If the user map still contains default values, i.e. the 830 * direct-to-font mapping, then assume user is using Latin1. 831 * 832 * FIXME: at some point we need to decide if we want to lock the table 833 * update element itself via the keyboard_event_lock for consistency with the 834 * keyboard driver as well as the consoles 835 */ 836 /* may be called during an interrupt */ 837 u32 conv_8bit_to_uni(unsigned char c) 838 { 839 unsigned short uni = translations[USER_MAP][c]; 840 return uni == (0xf000 | c) ? c : uni; 841 } 842 843 int conv_uni_to_8bit(u32 uni) 844 { 845 int c; 846 for (c = 0; c < ARRAY_SIZE(translations[USER_MAP]); c++) 847 if (translations[USER_MAP][c] == uni || 848 (translations[USER_MAP][c] == (c | 0xf000) && uni == c)) 849 return c; 850 return -1; 851 } 852 853 int conv_uni_to_pc(struct vc_data *conp, long ucs) 854 { 855 struct uni_pagedict *dict; 856 u16 **dir, *row, glyph; 857 858 /* Only 16-bit codes supported at this time */ 859 if (ucs > 0xffff) 860 return -4; /* Not found */ 861 else if (ucs < 0x20) 862 return -1; /* Not a printable character */ 863 else if (ucs == 0xfeff || (ucs >= 0x200b && ucs <= 0x200f)) 864 return -2; /* Zero-width space */ 865 /* 866 * UNI_DIRECT_BASE indicates the start of the region in the User Zone 867 * which always has a 1:1 mapping to the currently loaded font. The 868 * UNI_DIRECT_MASK indicates the bit span of the region. 869 */ 870 else if ((ucs & ~UNI_DIRECT_MASK) == UNI_DIRECT_BASE) 871 return ucs & UNI_DIRECT_MASK; 872 873 dict = *conp->vc_uni_pagedir_loc; 874 if (!dict) 875 return -3; 876 877 dir = dict->uni_pgdir[UNI_DIR(ucs)]; 878 if (!dir) 879 return -4; 880 881 row = dir[UNI_ROW(ucs)]; 882 if (!row) 883 return -4; 884 885 glyph = row[UNI_GLYPH(ucs)]; 886 if (glyph >= MAX_GLYPH) 887 return -4; 888 889 return glyph; 890 } 891 892 /* 893 * This is called at sys_setup time, after memory and the console are 894 * initialized. It must be possible to call kmalloc(..., GFP_KERNEL) 895 * from this function, hence the call from sys_setup. 896 */ 897 void __init 898 console_map_init(void) 899 { 900 int i; 901 902 for (i = 0; i < MAX_NR_CONSOLES; i++) 903 if (vc_cons_allocated(i) && !*vc_cons[i].d->vc_uni_pagedir_loc) 904 con_set_default_unimap(vc_cons[i].d); 905 } 906 907