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_sem --> cpu_hotplug.lock --> console_lock --> &mm->mmap_sem 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 { 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 { 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 { 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 { 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 int inv_translate[MAX_NR_CONSOLES]; 188 189 struct uni_pagedir { 190 u16 **uni_pgdir[32]; 191 unsigned long refcount; 192 unsigned long sum; 193 unsigned char *inverse_translations[4]; 194 u16 *inverse_trans_unicode; 195 }; 196 197 static struct uni_pagedir *dflt; 198 199 static void set_inverse_transl(struct vc_data *conp, struct uni_pagedir *p, int i) 200 { 201 int j, glyph; 202 unsigned short *t = translations[i]; 203 unsigned char *q; 204 205 if (!p) return; 206 q = p->inverse_translations[i]; 207 208 if (!q) { 209 q = p->inverse_translations[i] = kmalloc(MAX_GLYPH, GFP_KERNEL); 210 if (!q) return; 211 } 212 memset(q, 0, MAX_GLYPH); 213 214 for (j = 0; j < E_TABSZ; j++) { 215 glyph = conv_uni_to_pc(conp, t[j]); 216 if (glyph >= 0 && glyph < MAX_GLYPH && q[glyph] < 32) { 217 /* prefer '-' above SHY etc. */ 218 q[glyph] = j; 219 } 220 } 221 } 222 223 static void set_inverse_trans_unicode(struct vc_data *conp, 224 struct uni_pagedir *p) 225 { 226 int i, j, k, glyph; 227 u16 **p1, *p2; 228 u16 *q; 229 230 if (!p) return; 231 q = p->inverse_trans_unicode; 232 if (!q) { 233 q = p->inverse_trans_unicode = 234 kmalloc_array(MAX_GLYPH, sizeof(u16), GFP_KERNEL); 235 if (!q) 236 return; 237 } 238 memset(q, 0, MAX_GLYPH * sizeof(u16)); 239 240 for (i = 0; i < 32; i++) { 241 p1 = p->uni_pgdir[i]; 242 if (!p1) 243 continue; 244 for (j = 0; j < 32; j++) { 245 p2 = p1[j]; 246 if (!p2) 247 continue; 248 for (k = 0; k < 64; k++) { 249 glyph = p2[k]; 250 if (glyph >= 0 && glyph < MAX_GLYPH 251 && q[glyph] < 32) 252 q[glyph] = (i << 11) + (j << 6) + k; 253 } 254 } 255 } 256 } 257 258 unsigned short *set_translate(int m, struct vc_data *vc) 259 { 260 inv_translate[vc->vc_num] = m; 261 return translations[m]; 262 } 263 264 /* 265 * Inverse translation is impossible for several reasons: 266 * 1. The font<->character maps are not 1-1. 267 * 2. The text may have been written while a different translation map 268 * was active. 269 * Still, it is now possible to a certain extent to cut and paste non-ASCII. 270 */ 271 u16 inverse_translate(struct vc_data *conp, int glyph, int use_unicode) 272 { 273 struct uni_pagedir *p; 274 int m; 275 if (glyph < 0 || glyph >= MAX_GLYPH) 276 return 0; 277 else { 278 p = *conp->vc_uni_pagedir_loc; 279 if (!p) 280 return glyph; 281 else if (use_unicode) { 282 if (!p->inverse_trans_unicode) 283 return glyph; 284 else 285 return p->inverse_trans_unicode[glyph]; 286 } else { 287 m = inv_translate[conp->vc_num]; 288 if (!p->inverse_translations[m]) 289 return glyph; 290 else 291 return p->inverse_translations[m][glyph]; 292 } 293 } 294 } 295 EXPORT_SYMBOL_GPL(inverse_translate); 296 297 static void update_user_maps(void) 298 { 299 int i; 300 struct uni_pagedir *p, *q = NULL; 301 302 for (i = 0; i < MAX_NR_CONSOLES; i++) { 303 if (!vc_cons_allocated(i)) 304 continue; 305 p = *vc_cons[i].d->vc_uni_pagedir_loc; 306 if (p && p != q) { 307 set_inverse_transl(vc_cons[i].d, p, USER_MAP); 308 set_inverse_trans_unicode(vc_cons[i].d, p); 309 q = p; 310 } 311 } 312 } 313 314 /* 315 * Load customizable translation table 316 * arg points to a 256 byte translation table. 317 * 318 * The "old" variants are for translation directly to font (using the 319 * 0xf000-0xf0ff "transparent" Unicodes) whereas the "new" variants set 320 * Unicodes explicitly. 321 */ 322 int con_set_trans_old(unsigned char __user * arg) 323 { 324 int i; 325 unsigned short inbuf[E_TABSZ]; 326 unsigned char ubuf[E_TABSZ]; 327 328 if (copy_from_user(ubuf, arg, E_TABSZ)) 329 return -EFAULT; 330 331 for (i = 0; i < E_TABSZ ; i++) 332 inbuf[i] = UNI_DIRECT_BASE | ubuf[i]; 333 334 console_lock(); 335 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf)); 336 update_user_maps(); 337 console_unlock(); 338 return 0; 339 } 340 341 int con_get_trans_old(unsigned char __user * arg) 342 { 343 int i, ch; 344 unsigned short *p = translations[USER_MAP]; 345 unsigned char outbuf[E_TABSZ]; 346 347 console_lock(); 348 for (i = 0; i < E_TABSZ ; i++) 349 { 350 ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]); 351 outbuf[i] = (ch & ~0xff) ? 0 : ch; 352 } 353 console_unlock(); 354 355 return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0; 356 } 357 358 int con_set_trans_new(ushort __user * arg) 359 { 360 unsigned short inbuf[E_TABSZ]; 361 362 if (copy_from_user(inbuf, arg, sizeof(inbuf))) 363 return -EFAULT; 364 365 console_lock(); 366 memcpy(translations[USER_MAP], inbuf, sizeof(inbuf)); 367 update_user_maps(); 368 console_unlock(); 369 return 0; 370 } 371 372 int con_get_trans_new(ushort __user * arg) 373 { 374 unsigned short outbuf[E_TABSZ]; 375 376 console_lock(); 377 memcpy(outbuf, translations[USER_MAP], sizeof(outbuf)); 378 console_unlock(); 379 380 return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0; 381 } 382 383 /* 384 * Unicode -> current font conversion 385 * 386 * A font has at most 512 chars, usually 256. 387 * But one font position may represent several Unicode chars. 388 * A hashtable is somewhat of a pain to deal with, so use a 389 * "paged table" instead. Simulation has shown the memory cost of 390 * this 3-level paged table scheme to be comparable to a hash table. 391 */ 392 393 extern u8 dfont_unicount[]; /* Defined in console_defmap.c */ 394 extern u16 dfont_unitable[]; 395 396 static void con_release_unimap(struct uni_pagedir *p) 397 { 398 u16 **p1; 399 int i, j; 400 401 if (p == dflt) dflt = NULL; 402 for (i = 0; i < 32; i++) { 403 p1 = p->uni_pgdir[i]; 404 if (p1 != NULL) { 405 for (j = 0; j < 32; j++) 406 kfree(p1[j]); 407 kfree(p1); 408 } 409 p->uni_pgdir[i] = NULL; 410 } 411 for (i = 0; i < 4; i++) { 412 kfree(p->inverse_translations[i]); 413 p->inverse_translations[i] = NULL; 414 } 415 kfree(p->inverse_trans_unicode); 416 p->inverse_trans_unicode = NULL; 417 } 418 419 /* Caller must hold the console lock */ 420 void con_free_unimap(struct vc_data *vc) 421 { 422 struct uni_pagedir *p; 423 424 p = *vc->vc_uni_pagedir_loc; 425 if (!p) 426 return; 427 *vc->vc_uni_pagedir_loc = NULL; 428 if (--p->refcount) 429 return; 430 con_release_unimap(p); 431 kfree(p); 432 } 433 434 static int con_unify_unimap(struct vc_data *conp, struct uni_pagedir *p) 435 { 436 int i, j, k; 437 struct uni_pagedir *q; 438 439 for (i = 0; i < MAX_NR_CONSOLES; i++) { 440 if (!vc_cons_allocated(i)) 441 continue; 442 q = *vc_cons[i].d->vc_uni_pagedir_loc; 443 if (!q || q == p || q->sum != p->sum) 444 continue; 445 for (j = 0; j < 32; j++) { 446 u16 **p1, **q1; 447 p1 = p->uni_pgdir[j]; q1 = q->uni_pgdir[j]; 448 if (!p1 && !q1) 449 continue; 450 if (!p1 || !q1) 451 break; 452 for (k = 0; k < 32; k++) { 453 if (!p1[k] && !q1[k]) 454 continue; 455 if (!p1[k] || !q1[k]) 456 break; 457 if (memcmp(p1[k], q1[k], 64*sizeof(u16))) 458 break; 459 } 460 if (k < 32) 461 break; 462 } 463 if (j == 32) { 464 q->refcount++; 465 *conp->vc_uni_pagedir_loc = q; 466 con_release_unimap(p); 467 kfree(p); 468 return 1; 469 } 470 } 471 return 0; 472 } 473 474 static int 475 con_insert_unipair(struct uni_pagedir *p, u_short unicode, u_short fontpos) 476 { 477 int i, n; 478 u16 **p1, *p2; 479 480 p1 = p->uni_pgdir[n = unicode >> 11]; 481 if (!p1) { 482 p1 = p->uni_pgdir[n] = kmalloc_array(32, sizeof(u16 *), 483 GFP_KERNEL); 484 if (!p1) return -ENOMEM; 485 for (i = 0; i < 32; i++) 486 p1[i] = NULL; 487 } 488 489 p2 = p1[n = (unicode >> 6) & 0x1f]; 490 if (!p2) { 491 p2 = p1[n] = kmalloc_array(64, sizeof(u16), GFP_KERNEL); 492 if (!p2) return -ENOMEM; 493 memset(p2, 0xff, 64*sizeof(u16)); /* No glyphs for the characters (yet) */ 494 } 495 496 p2[unicode & 0x3f] = fontpos; 497 498 p->sum += (fontpos << 20) + unicode; 499 500 return 0; 501 } 502 503 /* Caller must hold the lock */ 504 static int con_do_clear_unimap(struct vc_data *vc) 505 { 506 struct uni_pagedir *p, *q; 507 508 p = *vc->vc_uni_pagedir_loc; 509 if (!p || --p->refcount) { 510 q = kzalloc(sizeof(*p), GFP_KERNEL); 511 if (!q) { 512 if (p) 513 p->refcount++; 514 return -ENOMEM; 515 } 516 q->refcount=1; 517 *vc->vc_uni_pagedir_loc = q; 518 } else { 519 if (p == dflt) dflt = NULL; 520 p->refcount++; 521 p->sum = 0; 522 con_release_unimap(p); 523 } 524 return 0; 525 } 526 527 int con_clear_unimap(struct vc_data *vc) 528 { 529 int ret; 530 console_lock(); 531 ret = con_do_clear_unimap(vc); 532 console_unlock(); 533 return ret; 534 } 535 536 int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list) 537 { 538 int err = 0, err1, i; 539 struct uni_pagedir *p, *q; 540 struct unipair *unilist, *plist; 541 542 if (!ct) 543 return 0; 544 545 unilist = vmemdup_user(list, ct * sizeof(struct unipair)); 546 if (IS_ERR(unilist)) 547 return PTR_ERR(unilist); 548 549 console_lock(); 550 551 /* Save original vc_unipagdir_loc in case we allocate a new one */ 552 p = *vc->vc_uni_pagedir_loc; 553 554 if (!p) { 555 err = -EINVAL; 556 557 goto out_unlock; 558 } 559 560 if (p->refcount > 1) { 561 int j, k; 562 u16 **p1, *p2, l; 563 564 err1 = con_do_clear_unimap(vc); 565 if (err1) { 566 err = err1; 567 goto out_unlock; 568 } 569 570 /* 571 * Since refcount was > 1, con_clear_unimap() allocated a 572 * a new uni_pagedir for this vc. Re: p != q 573 */ 574 q = *vc->vc_uni_pagedir_loc; 575 576 /* 577 * uni_pgdir is a 32*32*64 table with rows allocated 578 * when its first entry is added. The unicode value must 579 * still be incremented for empty rows. We are copying 580 * entries from "p" (old) to "q" (new). 581 */ 582 l = 0; /* unicode value */ 583 for (i = 0; i < 32; i++) { 584 p1 = p->uni_pgdir[i]; 585 if (p1) 586 for (j = 0; j < 32; j++) { 587 p2 = p1[j]; 588 if (p2) { 589 for (k = 0; k < 64; k++, l++) 590 if (p2[k] != 0xffff) { 591 /* 592 * Found one, copy entry for unicode 593 * l with fontpos value p2[k]. 594 */ 595 err1 = con_insert_unipair(q, l, p2[k]); 596 if (err1) { 597 p->refcount++; 598 *vc->vc_uni_pagedir_loc = p; 599 con_release_unimap(q); 600 kfree(q); 601 err = err1; 602 goto out_unlock; 603 } 604 } 605 } else { 606 /* Account for row of 64 empty entries */ 607 l += 64; 608 } 609 } 610 else 611 /* Account for empty table */ 612 l += 32 * 64; 613 } 614 615 /* 616 * Finished copying font table, set vc_uni_pagedir to new table 617 */ 618 p = q; 619 } else if (p == dflt) { 620 dflt = NULL; 621 } 622 623 /* 624 * Insert user specified unicode pairs into new table. 625 */ 626 for (plist = unilist; ct; ct--, plist++) { 627 err1 = con_insert_unipair(p, plist->unicode, plist->fontpos); 628 if (err1) 629 err = err1; 630 } 631 632 /* 633 * Merge with fontmaps of any other virtual consoles. 634 */ 635 if (con_unify_unimap(vc, p)) 636 goto out_unlock; 637 638 for (i = 0; i <= 3; i++) 639 set_inverse_transl(vc, p, i); /* Update inverse translations */ 640 set_inverse_trans_unicode(vc, p); 641 642 out_unlock: 643 console_unlock(); 644 kvfree(unilist); 645 return err; 646 } 647 648 /** 649 * con_set_default_unimap - set default unicode map 650 * @vc: the console we are updating 651 * 652 * Loads the unimap for the hardware font, as defined in uni_hash.tbl. 653 * The representation used was the most compact I could come up 654 * with. This routine is executed at video setup, and when the 655 * PIO_FONTRESET ioctl is called. 656 * 657 * The caller must hold the console lock 658 */ 659 int con_set_default_unimap(struct vc_data *vc) 660 { 661 int i, j, err = 0, err1; 662 u16 *q; 663 struct uni_pagedir *p; 664 665 if (dflt) { 666 p = *vc->vc_uni_pagedir_loc; 667 if (p == dflt) 668 return 0; 669 670 dflt->refcount++; 671 *vc->vc_uni_pagedir_loc = dflt; 672 if (p && !--p->refcount) { 673 con_release_unimap(p); 674 kfree(p); 675 } 676 return 0; 677 } 678 679 /* The default font is always 256 characters */ 680 681 err = con_do_clear_unimap(vc); 682 if (err) 683 return err; 684 685 p = *vc->vc_uni_pagedir_loc; 686 q = dfont_unitable; 687 688 for (i = 0; i < 256; i++) 689 for (j = dfont_unicount[i]; j; j--) { 690 err1 = con_insert_unipair(p, *(q++), i); 691 if (err1) 692 err = err1; 693 } 694 695 if (con_unify_unimap(vc, p)) { 696 dflt = *vc->vc_uni_pagedir_loc; 697 return err; 698 } 699 700 for (i = 0; i <= 3; i++) 701 set_inverse_transl(vc, p, i); /* Update all inverse translations */ 702 set_inverse_trans_unicode(vc, p); 703 dflt = p; 704 return err; 705 } 706 EXPORT_SYMBOL(con_set_default_unimap); 707 708 /** 709 * con_copy_unimap - copy unimap between two vts 710 * @dst_vc: target 711 * @src_vt: source 712 * 713 * The caller must hold the console lock when invoking this method 714 */ 715 int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc) 716 { 717 struct uni_pagedir *q; 718 719 if (!*src_vc->vc_uni_pagedir_loc) 720 return -EINVAL; 721 if (*dst_vc->vc_uni_pagedir_loc == *src_vc->vc_uni_pagedir_loc) 722 return 0; 723 con_free_unimap(dst_vc); 724 q = *src_vc->vc_uni_pagedir_loc; 725 q->refcount++; 726 *dst_vc->vc_uni_pagedir_loc = q; 727 return 0; 728 } 729 EXPORT_SYMBOL(con_copy_unimap); 730 731 /** 732 * con_get_unimap - get the unicode map 733 * @vc: the console to read from 734 * 735 * Read the console unicode data for this console. Called from the ioctl 736 * handlers. 737 */ 738 int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct unipair __user *list) 739 { 740 int i, j, k, ret = 0; 741 ushort ect; 742 u16 **p1, *p2; 743 struct uni_pagedir *p; 744 struct unipair *unilist; 745 746 unilist = kvmalloc_array(ct, sizeof(struct unipair), GFP_KERNEL); 747 if (!unilist) 748 return -ENOMEM; 749 750 console_lock(); 751 752 ect = 0; 753 if (*vc->vc_uni_pagedir_loc) { 754 p = *vc->vc_uni_pagedir_loc; 755 for (i = 0; i < 32; i++) { 756 p1 = p->uni_pgdir[i]; 757 if (p1) 758 for (j = 0; j < 32; j++) { 759 p2 = *(p1++); 760 if (p2) 761 for (k = 0; k < 64; k++, p2++) { 762 if (*p2 >= MAX_GLYPH) 763 continue; 764 if (ect < ct) { 765 unilist[ect].unicode = 766 (i<<11)+(j<<6)+k; 767 unilist[ect].fontpos = *p2; 768 } 769 ect++; 770 } 771 } 772 } 773 } 774 console_unlock(); 775 if (copy_to_user(list, unilist, min(ect, ct) * sizeof(struct unipair))) 776 ret = -EFAULT; 777 put_user(ect, uct); 778 kvfree(unilist); 779 return ret ? ret : (ect <= ct) ? 0 : -ENOMEM; 780 } 781 782 /* 783 * Always use USER_MAP. These functions are used by the keyboard, 784 * which shouldn't be affected by G0/G1 switching, etc. 785 * If the user map still contains default values, i.e. the 786 * direct-to-font mapping, then assume user is using Latin1. 787 * 788 * FIXME: at some point we need to decide if we want to lock the table 789 * update element itself via the keyboard_event_lock for consistency with the 790 * keyboard driver as well as the consoles 791 */ 792 /* may be called during an interrupt */ 793 u32 conv_8bit_to_uni(unsigned char c) 794 { 795 unsigned short uni = translations[USER_MAP][c]; 796 return uni == (0xf000 | c) ? c : uni; 797 } 798 799 int conv_uni_to_8bit(u32 uni) 800 { 801 int c; 802 for (c = 0; c < 0x100; c++) 803 if (translations[USER_MAP][c] == uni || 804 (translations[USER_MAP][c] == (c | 0xf000) && uni == c)) 805 return c; 806 return -1; 807 } 808 809 int 810 conv_uni_to_pc(struct vc_data *conp, long ucs) 811 { 812 int h; 813 u16 **p1, *p2; 814 struct uni_pagedir *p; 815 816 /* Only 16-bit codes supported at this time */ 817 if (ucs > 0xffff) 818 return -4; /* Not found */ 819 else if (ucs < 0x20) 820 return -1; /* Not a printable character */ 821 else if (ucs == 0xfeff || (ucs >= 0x200b && ucs <= 0x200f)) 822 return -2; /* Zero-width space */ 823 /* 824 * UNI_DIRECT_BASE indicates the start of the region in the User Zone 825 * which always has a 1:1 mapping to the currently loaded font. The 826 * UNI_DIRECT_MASK indicates the bit span of the region. 827 */ 828 else if ((ucs & ~UNI_DIRECT_MASK) == UNI_DIRECT_BASE) 829 return ucs & UNI_DIRECT_MASK; 830 831 if (!*conp->vc_uni_pagedir_loc) 832 return -3; 833 834 p = *conp->vc_uni_pagedir_loc; 835 if ((p1 = p->uni_pgdir[ucs >> 11]) && 836 (p2 = p1[(ucs >> 6) & 0x1f]) && 837 (h = p2[ucs & 0x3f]) < MAX_GLYPH) 838 return h; 839 840 return -4; /* not found */ 841 } 842 843 /* 844 * This is called at sys_setup time, after memory and the console are 845 * initialized. It must be possible to call kmalloc(..., GFP_KERNEL) 846 * from this function, hence the call from sys_setup. 847 */ 848 void __init 849 console_map_init(void) 850 { 851 int i; 852 853 for (i = 0; i < MAX_NR_CONSOLES; i++) 854 if (vc_cons_allocated(i) && !*vc_cons[i].d->vc_uni_pagedir_loc) 855 con_set_default_unimap(vc_cons[i].d); 856 } 857 858