drivers/tty/vt/consolemap.c

   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