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 *p) 458 { 459 int i, j, k; 460 struct uni_pagedict *q; 461 462 for (i = 0; i < MAX_NR_CONSOLES; i++) { 463 if (!vc_cons_allocated(i)) 464 continue; 465 q = *vc_cons[i].d->vc_uni_pagedir_loc; 466 if (!q || q == p || q->sum != p->sum) 467 continue; 468 for (j = 0; j < UNI_DIRS; j++) { 469 u16 **p1, **q1; 470 p1 = p->uni_pgdir[j]; 471 q1 = q->uni_pgdir[j]; 472 if (!p1 && !q1) 473 continue; 474 if (!p1 || !q1) 475 break; 476 for (k = 0; k < UNI_DIR_ROWS; k++) { 477 if (!p1[k] && !q1[k]) 478 continue; 479 if (!p1[k] || !q1[k]) 480 break; 481 if (memcmp(p1[k], q1[k], UNI_ROW_GLYPHS * 482 sizeof(*p1[k]))) 483 break; 484 } 485 if (k < UNI_DIR_ROWS) 486 break; 487 } 488 if (j == UNI_DIRS) { 489 q->refcount++; 490 *conp->vc_uni_pagedir_loc = q; 491 con_release_unimap(p); 492 kfree(p); 493 return 1; 494 } 495 } 496 return 0; 497 } 498 499 static int 500 con_insert_unipair(struct uni_pagedict *p, u_short unicode, u_short fontpos) 501 { 502 int n; 503 u16 **p1, *p2; 504 505 n = UNI_DIR(unicode); 506 p1 = p->uni_pgdir[n]; 507 if (!p1) { 508 p1 = p->uni_pgdir[n] = kcalloc(UNI_DIR_ROWS, sizeof(*p1), 509 GFP_KERNEL); 510 if (!p1) 511 return -ENOMEM; 512 } 513 514 n = UNI_ROW(unicode); 515 p2 = p1[n]; 516 if (!p2) { 517 p2 = p1[n] = kmalloc_array(UNI_ROW_GLYPHS, sizeof(*p2), 518 GFP_KERNEL); 519 if (!p2) 520 return -ENOMEM; 521 /* No glyphs for the characters (yet) */ 522 memset(p2, 0xff, UNI_ROW_GLYPHS * sizeof(*p2)); 523 } 524 525 p2[UNI_GLYPH(unicode)] = fontpos; 526 527 p->sum += (fontpos << 20U) + unicode; 528 529 return 0; 530 } 531 532 /* Caller must hold the lock */ 533 static int con_do_clear_unimap(struct vc_data *vc) 534 { 535 struct uni_pagedict *p, *q; 536 537 p = *vc->vc_uni_pagedir_loc; 538 if (!p || --p->refcount) { 539 q = kzalloc(sizeof(*p), GFP_KERNEL); 540 if (!q) { 541 if (p) 542 p->refcount++; 543 return -ENOMEM; 544 } 545 q->refcount=1; 546 *vc->vc_uni_pagedir_loc = q; 547 } else { 548 if (p == dflt) 549 dflt = NULL; 550 p->refcount++; 551 p->sum = 0; 552 con_release_unimap(p); 553 } 554 return 0; 555 } 556 557 int con_clear_unimap(struct vc_data *vc) 558 { 559 int ret; 560 console_lock(); 561 ret = con_do_clear_unimap(vc); 562 console_unlock(); 563 return ret; 564 } 565 566 static struct uni_pagedict *con_unshare_unimap(struct vc_data *vc, 567 struct uni_pagedict *p) 568 { 569 struct uni_pagedict *q; 570 u16 **p1, *p2, l; 571 int ret; 572 int i, j, k; 573 574 ret = con_do_clear_unimap(vc); 575 if (ret) 576 return ERR_PTR(ret); 577 578 /* 579 * Since refcount was > 1, con_clear_unimap() allocated a new 580 * uni_pagedict for this vc. Re: p != q 581 */ 582 q = *vc->vc_uni_pagedir_loc; 583 584 /* 585 * uni_pgdir is a 32*32*64 table with rows allocated when its first 586 * entry is added. The unicode value must still be incremented for 587 * empty rows. We are copying entries from "p" (old) to "q" (new). 588 */ 589 l = 0; /* unicode value */ 590 for (i = 0; i < UNI_DIRS; i++) { 591 p1 = p->uni_pgdir[i]; 592 if (!p1) { 593 /* Account for empty table */ 594 l += UNI_DIR_ROWS * UNI_ROW_GLYPHS; 595 continue; 596 } 597 598 for (j = 0; j < UNI_DIR_ROWS; j++) { 599 p2 = p1[j]; 600 if (!p2) { 601 /* Account for row of 64 empty entries */ 602 l += UNI_ROW_GLYPHS; 603 continue; 604 } 605 606 for (k = 0; k < UNI_ROW_GLYPHS; k++, l++) { 607 if (p2[k] == 0xffff) 608 continue; 609 /* 610 * Found one, copy entry for unicode l with 611 * fontpos value p2[k]. 612 */ 613 ret = con_insert_unipair(q, l, p2[k]); 614 if (ret) { 615 p->refcount++; 616 *vc->vc_uni_pagedir_loc = p; 617 con_release_unimap(q); 618 kfree(q); 619 return ERR_PTR(ret); 620 } 621 } 622 } 623 } 624 625 return q; 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 *p; 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 p = *vc->vc_uni_pagedir_loc; 645 if (!p) { 646 err = -EINVAL; 647 goto out_unlock; 648 } 649 650 if (p->refcount > 1) { 651 p = con_unshare_unimap(vc, p); 652 if (IS_ERR(p)) { 653 err = PTR_ERR(p); 654 goto out_unlock; 655 } 656 } else if (p == 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(p, 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, p)) 673 goto out_unlock; 674 675 for (enum translation_map m = FIRST_MAP; m <= LAST_MAP; m++) 676 set_inverse_transl(vc, p, m); /* Update inverse translations */ 677 set_inverse_trans_unicode(vc, p); 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 int i, j, err = 0, err1; 699 u16 *q; 700 struct uni_pagedict *p; 701 702 if (dflt) { 703 p = *vc->vc_uni_pagedir_loc; 704 if (p == dflt) 705 return 0; 706 707 dflt->refcount++; 708 *vc->vc_uni_pagedir_loc = dflt; 709 if (p && !--p->refcount) { 710 con_release_unimap(p); 711 kfree(p); 712 } 713 return 0; 714 } 715 716 /* The default font is always 256 characters */ 717 718 err = con_do_clear_unimap(vc); 719 if (err) 720 return err; 721 722 p = *vc->vc_uni_pagedir_loc; 723 q = dfont_unitable; 724 725 for (i = 0; i < 256; i++) 726 for (j = dfont_unicount[i]; j; j--) { 727 err1 = con_insert_unipair(p, *(q++), i); 728 if (err1) 729 err = err1; 730 } 731 732 if (con_unify_unimap(vc, p)) { 733 dflt = *vc->vc_uni_pagedir_loc; 734 return err; 735 } 736 737 for (enum translation_map m = FIRST_MAP; m <= LAST_MAP; m++) 738 set_inverse_transl(vc, p, m); /* Update all inverse translations */ 739 set_inverse_trans_unicode(vc, p); 740 dflt = p; 741 return err; 742 } 743 EXPORT_SYMBOL(con_set_default_unimap); 744 745 /** 746 * con_copy_unimap - copy unimap between two vts 747 * @dst_vc: target 748 * @src_vc: source 749 * 750 * The caller must hold the console lock when invoking this method 751 */ 752 int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc) 753 { 754 struct uni_pagedict *q; 755 756 if (!*src_vc->vc_uni_pagedir_loc) 757 return -EINVAL; 758 if (*dst_vc->vc_uni_pagedir_loc == *src_vc->vc_uni_pagedir_loc) 759 return 0; 760 con_free_unimap(dst_vc); 761 q = *src_vc->vc_uni_pagedir_loc; 762 q->refcount++; 763 *dst_vc->vc_uni_pagedir_loc = q; 764 return 0; 765 } 766 EXPORT_SYMBOL(con_copy_unimap); 767 768 /* 769 * con_get_unimap - get the unicode map 770 * 771 * Read the console unicode data for this console. Called from the ioctl 772 * handlers. 773 */ 774 int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, 775 struct unipair __user *list) 776 { 777 int i, j, k, ret = 0; 778 ushort ect; 779 u16 **p1, *p2; 780 struct uni_pagedict *p; 781 struct unipair *unilist; 782 783 unilist = kvmalloc_array(ct, sizeof(*unilist), GFP_KERNEL); 784 if (!unilist) 785 return -ENOMEM; 786 787 console_lock(); 788 789 ect = 0; 790 p = *vc->vc_uni_pagedir_loc; 791 if (!p) 792 goto unlock; 793 794 for (i = 0; i < UNI_DIRS; i++) { 795 p1 = p->uni_pgdir[i]; 796 if (!p1) 797 continue; 798 799 for (j = 0; j < UNI_DIR_ROWS; j++, p1++) { 800 p2 = *p1; 801 if (!p2) 802 continue; 803 804 for (k = 0; k < UNI_ROW_GLYPHS; k++, p2++) { 805 if (*p2 >= MAX_GLYPH) 806 continue; 807 if (ect < ct) { 808 unilist[ect].unicode = UNI(i, j, k); 809 unilist[ect].fontpos = *p2; 810 } 811 ect++; 812 } 813 } 814 } 815 unlock: 816 console_unlock(); 817 if (copy_to_user(list, unilist, min(ect, ct) * sizeof(*unilist))) 818 ret = -EFAULT; 819 if (put_user(ect, uct)) 820 ret = -EFAULT; 821 kvfree(unilist); 822 return ret ? ret : (ect <= ct) ? 0 : -ENOMEM; 823 } 824 825 /* 826 * Always use USER_MAP. These functions are used by the keyboard, 827 * which shouldn't be affected by G0/G1 switching, etc. 828 * If the user map still contains default values, i.e. the 829 * direct-to-font mapping, then assume user is using Latin1. 830 * 831 * FIXME: at some point we need to decide if we want to lock the table 832 * update element itself via the keyboard_event_lock for consistency with the 833 * keyboard driver as well as the consoles 834 */ 835 /* may be called during an interrupt */ 836 u32 conv_8bit_to_uni(unsigned char c) 837 { 838 unsigned short uni = translations[USER_MAP][c]; 839 return uni == (0xf000 | c) ? c : uni; 840 } 841 842 int conv_uni_to_8bit(u32 uni) 843 { 844 int c; 845 for (c = 0; c < ARRAY_SIZE(translations[USER_MAP]); c++) 846 if (translations[USER_MAP][c] == uni || 847 (translations[USER_MAP][c] == (c | 0xf000) && uni == c)) 848 return c; 849 return -1; 850 } 851 852 int 853 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 if (!*conp->vc_uni_pagedir_loc) 874 return -3; 875 876 dict = *conp->vc_uni_pagedir_loc; 877 if ((dir = dict->uni_pgdir[UNI_DIR(ucs)]) && 878 (row = dir[UNI_ROW(ucs)]) && 879 (glyph = row[UNI_GLYPH(ucs)]) < MAX_GLYPH) 880 return glyph; 881 882 return -4; /* not found */ 883 } 884 885 /* 886 * This is called at sys_setup time, after memory and the console are 887 * initialized. It must be possible to call kmalloc(..., GFP_KERNEL) 888 * from this function, hence the call from sys_setup. 889 */ 890 void __init 891 console_map_init(void) 892 { 893 int i; 894 895 for (i = 0; i < MAX_NR_CONSOLES; i++) 896 if (vc_cons_allocated(i) && !*vc_cons[i].d->vc_uni_pagedir_loc) 897 con_set_default_unimap(vc_cons[i].d); 898 } 899 900