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 *p) 419 { 420 u16 **p1; 421 int i, j; 422 423 if (p == dflt) 424 dflt = NULL; 425 for (i = 0; i < UNI_DIRS; i++) { 426 p1 = p->uni_pgdir[i]; 427 if (p1 != NULL) { 428 for (j = 0; j < UNI_DIR_ROWS; j++) 429 kfree(p1[j]); 430 kfree(p1); 431 } 432 p->uni_pgdir[i] = NULL; 433 } 434 for (i = 0; i < ARRAY_SIZE(p->inverse_translations); i++) { 435 kfree(p->inverse_translations[i]); 436 p->inverse_translations[i] = NULL; 437 } 438 kfree(p->inverse_trans_unicode); 439 p->inverse_trans_unicode = NULL; 440 } 441 442 /* Caller must hold the console lock */ 443 void con_free_unimap(struct vc_data *vc) 444 { 445 struct uni_pagedict *p; 446 447 p = *vc->vc_uni_pagedir_loc; 448 if (!p) 449 return; 450 *vc->vc_uni_pagedir_loc = NULL; 451 if (--p->refcount) 452 return; 453 con_release_unimap(p); 454 kfree(p); 455 } 456 457 static int con_unify_unimap(struct vc_data *conp, struct uni_pagedict *dict1) 458 { 459 struct uni_pagedict *dict2; 460 unsigned int cons, d, r; 461 462 for (cons = 0; cons < MAX_NR_CONSOLES; cons++) { 463 if (!vc_cons_allocated(cons)) 464 continue; 465 dict2 = *vc_cons[cons].d->vc_uni_pagedir_loc; 466 if (!dict2 || dict2 == dict1 || dict2->sum != dict1->sum) 467 continue; 468 for (d = 0; d < UNI_DIRS; d++) { 469 u16 **dir1 = dict1->uni_pgdir[d]; 470 u16 **dir2 = dict2->uni_pgdir[d]; 471 if (!dir1 && !dir2) 472 continue; 473 if (!dir1 || !dir2) 474 break; 475 for (r = 0; r < UNI_DIR_ROWS; r++) { 476 if (!dir1[r] && !dir2[r]) 477 continue; 478 if (!dir1[r] || !dir2[r]) 479 break; 480 if (memcmp(dir1[r], dir2[r], UNI_ROW_GLYPHS * 481 sizeof(*dir1[r]))) 482 break; 483 } 484 if (r < UNI_DIR_ROWS) 485 break; 486 } 487 if (d == UNI_DIRS) { 488 dict2->refcount++; 489 *conp->vc_uni_pagedir_loc = dict2; 490 con_release_unimap(dict1); 491 kfree(dict1); 492 return 1; 493 } 494 } 495 return 0; 496 } 497 498 static int 499 con_insert_unipair(struct uni_pagedict *p, u_short unicode, u_short fontpos) 500 { 501 u16 **dir, *row; 502 unsigned int n; 503 504 n = UNI_DIR(unicode); 505 dir = p->uni_pgdir[n]; 506 if (!dir) { 507 dir = p->uni_pgdir[n] = kcalloc(UNI_DIR_ROWS, sizeof(*dir), 508 GFP_KERNEL); 509 if (!dir) 510 return -ENOMEM; 511 } 512 513 n = UNI_ROW(unicode); 514 row = dir[n]; 515 if (!row) { 516 row = dir[n] = kmalloc_array(UNI_ROW_GLYPHS, sizeof(*row), 517 GFP_KERNEL); 518 if (!row) 519 return -ENOMEM; 520 /* No glyphs for the characters (yet) */ 521 memset(row, 0xff, UNI_ROW_GLYPHS * sizeof(*row)); 522 } 523 524 row[UNI_GLYPH(unicode)] = fontpos; 525 526 p->sum += (fontpos << 20U) + unicode; 527 528 return 0; 529 } 530 531 /* Caller must hold the lock */ 532 static int con_do_clear_unimap(struct vc_data *vc) 533 { 534 struct uni_pagedict *old = *vc->vc_uni_pagedir_loc; 535 536 if (!old || --old->refcount) { 537 struct uni_pagedict *new = kzalloc(sizeof(*new), GFP_KERNEL); 538 if (!new) { 539 if (old) 540 old->refcount++; 541 return -ENOMEM; 542 } 543 new->refcount = 1; 544 *vc->vc_uni_pagedir_loc = new; 545 } else { 546 if (old == dflt) 547 dflt = NULL; 548 old->refcount++; 549 old->sum = 0; 550 con_release_unimap(old); 551 } 552 return 0; 553 } 554 555 int con_clear_unimap(struct vc_data *vc) 556 { 557 int ret; 558 console_lock(); 559 ret = con_do_clear_unimap(vc); 560 console_unlock(); 561 return ret; 562 } 563 564 static struct uni_pagedict *con_unshare_unimap(struct vc_data *vc, 565 struct uni_pagedict *p) 566 { 567 struct uni_pagedict *q; 568 u16 **p1, *p2, l; 569 int ret; 570 int i, j, k; 571 572 ret = con_do_clear_unimap(vc); 573 if (ret) 574 return ERR_PTR(ret); 575 576 /* 577 * Since refcount was > 1, con_clear_unimap() allocated a new 578 * uni_pagedict for this vc. Re: p != q 579 */ 580 q = *vc->vc_uni_pagedir_loc; 581 582 /* 583 * uni_pgdir is a 32*32*64 table with rows allocated when its first 584 * entry is added. The unicode value must still be incremented for 585 * empty rows. We are copying entries from "p" (old) to "q" (new). 586 */ 587 l = 0; /* unicode value */ 588 for (i = 0; i < UNI_DIRS; i++) { 589 p1 = p->uni_pgdir[i]; 590 if (!p1) { 591 /* Account for empty table */ 592 l += UNI_DIR_ROWS * UNI_ROW_GLYPHS; 593 continue; 594 } 595 596 for (j = 0; j < UNI_DIR_ROWS; j++) { 597 p2 = p1[j]; 598 if (!p2) { 599 /* Account for row of 64 empty entries */ 600 l += UNI_ROW_GLYPHS; 601 continue; 602 } 603 604 for (k = 0; k < UNI_ROW_GLYPHS; k++, l++) { 605 if (p2[k] == 0xffff) 606 continue; 607 /* 608 * Found one, copy entry for unicode l with 609 * fontpos value p2[k]. 610 */ 611 ret = con_insert_unipair(q, l, p2[k]); 612 if (ret) { 613 p->refcount++; 614 *vc->vc_uni_pagedir_loc = p; 615 con_release_unimap(q); 616 kfree(q); 617 return ERR_PTR(ret); 618 } 619 } 620 } 621 } 622 623 return q; 624 } 625 626 int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list) 627 { 628 int err = 0, err1; 629 struct uni_pagedict *p; 630 struct unipair *unilist, *plist; 631 632 if (!ct) 633 return 0; 634 635 unilist = vmemdup_user(list, array_size(sizeof(*unilist), ct)); 636 if (IS_ERR(unilist)) 637 return PTR_ERR(unilist); 638 639 console_lock(); 640 641 /* Save original vc_unipagdir_loc in case we allocate a new one */ 642 p = *vc->vc_uni_pagedir_loc; 643 if (!p) { 644 err = -EINVAL; 645 goto out_unlock; 646 } 647 648 if (p->refcount > 1) { 649 p = con_unshare_unimap(vc, p); 650 if (IS_ERR(p)) { 651 err = PTR_ERR(p); 652 goto out_unlock; 653 } 654 } else if (p == dflt) { 655 dflt = NULL; 656 } 657 658 /* 659 * Insert user specified unicode pairs into new table. 660 */ 661 for (plist = unilist; ct; ct--, plist++) { 662 err1 = con_insert_unipair(p, plist->unicode, plist->fontpos); 663 if (err1) 664 err = err1; 665 } 666 667 /* 668 * Merge with fontmaps of any other virtual consoles. 669 */ 670 if (con_unify_unimap(vc, p)) 671 goto out_unlock; 672 673 for (enum translation_map m = FIRST_MAP; m <= LAST_MAP; m++) 674 set_inverse_transl(vc, p, m); /* Update inverse translations */ 675 set_inverse_trans_unicode(vc, p); 676 677 out_unlock: 678 console_unlock(); 679 kvfree(unilist); 680 return err; 681 } 682 683 /** 684 * con_set_default_unimap - set default unicode map 685 * @vc: the console we are updating 686 * 687 * Loads the unimap for the hardware font, as defined in uni_hash.tbl. 688 * The representation used was the most compact I could come up 689 * with. This routine is executed at video setup, and when the 690 * PIO_FONTRESET ioctl is called. 691 * 692 * The caller must hold the console lock 693 */ 694 int con_set_default_unimap(struct vc_data *vc) 695 { 696 int i, j, err = 0, err1; 697 u16 *q; 698 struct uni_pagedict *p; 699 700 if (dflt) { 701 p = *vc->vc_uni_pagedir_loc; 702 if (p == dflt) 703 return 0; 704 705 dflt->refcount++; 706 *vc->vc_uni_pagedir_loc = dflt; 707 if (p && !--p->refcount) { 708 con_release_unimap(p); 709 kfree(p); 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 p = *vc->vc_uni_pagedir_loc; 721 q = dfont_unitable; 722 723 for (i = 0; i < 256; i++) 724 for (j = dfont_unicount[i]; j; j--) { 725 err1 = con_insert_unipair(p, *(q++), i); 726 if (err1) 727 err = err1; 728 } 729 730 if (con_unify_unimap(vc, p)) { 731 dflt = *vc->vc_uni_pagedir_loc; 732 return err; 733 } 734 735 for (enum translation_map m = FIRST_MAP; m <= LAST_MAP; m++) 736 set_inverse_transl(vc, p, m); /* Update all inverse translations */ 737 set_inverse_trans_unicode(vc, p); 738 dflt = p; 739 return err; 740 } 741 EXPORT_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 */ 750 int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc) 751 { 752 struct uni_pagedict *q; 753 754 if (!*src_vc->vc_uni_pagedir_loc) 755 return -EINVAL; 756 if (*dst_vc->vc_uni_pagedir_loc == *src_vc->vc_uni_pagedir_loc) 757 return 0; 758 con_free_unimap(dst_vc); 759 q = *src_vc->vc_uni_pagedir_loc; 760 q->refcount++; 761 *dst_vc->vc_uni_pagedir_loc = q; 762 return 0; 763 } 764 EXPORT_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 */ 772 int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, 773 struct unipair __user *list) 774 { 775 int i, j, k, ret = 0; 776 ushort ect; 777 u16 **p1, *p2; 778 struct uni_pagedict *p; 779 struct unipair *unilist; 780 781 unilist = kvmalloc_array(ct, sizeof(*unilist), GFP_KERNEL); 782 if (!unilist) 783 return -ENOMEM; 784 785 console_lock(); 786 787 ect = 0; 788 p = *vc->vc_uni_pagedir_loc; 789 if (!p) 790 goto unlock; 791 792 for (i = 0; i < UNI_DIRS; i++) { 793 p1 = p->uni_pgdir[i]; 794 if (!p1) 795 continue; 796 797 for (j = 0; j < UNI_DIR_ROWS; j++, p1++) { 798 p2 = *p1; 799 if (!p2) 800 continue; 801 802 for (k = 0; k < UNI_ROW_GLYPHS; k++, p2++) { 803 if (*p2 >= MAX_GLYPH) 804 continue; 805 if (ect < ct) { 806 unilist[ect].unicode = UNI(i, j, k); 807 unilist[ect].fontpos = *p2; 808 } 809 ect++; 810 } 811 } 812 } 813 unlock: 814 console_unlock(); 815 if (copy_to_user(list, unilist, min(ect, ct) * sizeof(*unilist))) 816 ret = -EFAULT; 817 if (put_user(ect, uct)) 818 ret = -EFAULT; 819 kvfree(unilist); 820 return ret ? ret : (ect <= ct) ? 0 : -ENOMEM; 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 */ 834 u32 conv_8bit_to_uni(unsigned char c) 835 { 836 unsigned short uni = translations[USER_MAP][c]; 837 return uni == (0xf000 | c) ? c : uni; 838 } 839 840 int 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 } 849 850 int 851 conv_uni_to_pc(struct vc_data *conp, long ucs) 852 { 853 struct uni_pagedict *dict; 854 u16 **dir, *row, glyph; 855 856 /* Only 16-bit codes supported at this time */ 857 if (ucs > 0xffff) 858 return -4; /* Not found */ 859 else if (ucs < 0x20) 860 return -1; /* Not a printable character */ 861 else if (ucs == 0xfeff || (ucs >= 0x200b && ucs <= 0x200f)) 862 return -2; /* Zero-width space */ 863 /* 864 * UNI_DIRECT_BASE indicates the start of the region in the User Zone 865 * which always has a 1:1 mapping to the currently loaded font. The 866 * UNI_DIRECT_MASK indicates the bit span of the region. 867 */ 868 else if ((ucs & ~UNI_DIRECT_MASK) == UNI_DIRECT_BASE) 869 return ucs & UNI_DIRECT_MASK; 870 871 if (!*conp->vc_uni_pagedir_loc) 872 return -3; 873 874 dict = *conp->vc_uni_pagedir_loc; 875 if ((dir = dict->uni_pgdir[UNI_DIR(ucs)]) && 876 (row = dir[UNI_ROW(ucs)]) && 877 (glyph = row[UNI_GLYPH(ucs)]) < MAX_GLYPH) 878 return glyph; 879 880 return -4; /* not found */ 881 } 882 883 /* 884 * This is called at sys_setup time, after memory and the console are 885 * initialized. It must be possible to call kmalloc(..., GFP_KERNEL) 886 * from this function, hence the call from sys_setup. 887 */ 888 void __init 889 console_map_init(void) 890 { 891 int i; 892 893 for (i = 0; i < MAX_NR_CONSOLES; i++) 894 if (vc_cons_allocated(i) && !*vc_cons[i].d->vc_uni_pagedir_loc) 895 con_set_default_unimap(vc_cons[i].d); 896 } 897 898