drivers/char/consolemap.c

   1 /*
   2  * consolemap.c
   3  *
   4  * Mapping from internal code (such as Latin-1 or Unicode or IBM PC code)
   5  * to font positions.
   6  *
   7  * aeb, 950210
   8  *
   9  * Support for multiple unimaps by Jakub Jelinek <jj@ultra.linux.cz>, July 1998
  10  *
  11  * Fix bug in inverse translation. Stanislav Voronyi <stas@cnti.uanet.kharkov.ua>, Dec 1998
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kd.h>
  16 #include <linux/errno.h>
  17 #include <linux/mm.h>
  18 #include <linux/slab.h>
  19 #include <linux/init.h>
  20 #include <linux/tty.h>
  21 #include <asm/uaccess.h>
  22 #include <linux/consolemap.h>
  23 #include <linux/vt_kern.h>
  24
  25 static unsigned short translations[][256] = {
  26   /* 8-bit Latin-1 mapped to Unicode -- trivial mapping */
  27   {
  28     0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
  29     0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
  30     0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
  31     0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
  32     0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
  33     0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
  34     0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
  35     0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
  36     0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
  37     0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
  38     0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
  39     0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
  40     0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
  41     0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
  42     0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
  43     0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x007f,
  44     0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
  45     0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
  46     0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
  47     0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
  48     0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
  49     0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
  50     0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
  51     0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
  52     0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
  53     0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
  54     0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
  55     0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
  56     0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
  57     0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
  58     0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
  59     0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
  60   },
  61   /* VT100 graphics mapped to Unicode */
  62   {
  63     0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
  64     0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
  65     0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
  66     0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
  67     0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
  68     0x0028, 0x0029, 0x002a, 0x2192, 0x2190, 0x2191, 0x2193, 0x002f,
  69     0x2588, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
  70     0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
  71     0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
  72     0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
  73     0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
  74     0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x00a0,
  75     0x25c6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1,
  76     0x2591, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba,
  77     0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c,
  78     0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7, 0x007f,
  79     0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
  80     0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
  81     0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
  82     0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
  83     0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
  84     0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
  85     0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
  86     0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
  87     0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
  88     0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
  89     0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
  90     0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
  91     0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
  92     0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
  93     0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
  94     0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
  95   },
  96   /* IBM Codepage 437 mapped to Unicode */
  97   {
  98     0x0000, 0x263a, 0x263b, 0x2665, 0x2666, 0x2663, 0x2660, 0x2022,
  99     0x25d8, 0x25cb, 0x25d9, 0x2642, 0x2640, 0x266a, 0x266b, 0x263c,
 100     0x25b6, 0x25c0, 0x2195, 0x203c, 0x00b6, 0x00a7, 0x25ac, 0x21a8,
 101     0x2191, 0x2193, 0x2192, 0x2190, 0x221f, 0x2194, 0x25b2, 0x25bc,
 102     0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
 103     0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
 104     0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
 105     0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
 106     0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
 107     0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
 108     0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
 109     0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
 110     0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
 111     0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
 112     0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
 113     0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x2302,
 114     0x00c7, 0x00fc, 0x00e9, 0x00e2, 0x00e4, 0x00e0, 0x00e5, 0x00e7,
 115     0x00ea, 0x00eb, 0x00e8, 0x00ef, 0x00ee, 0x00ec, 0x00c4, 0x00c5,
 116     0x00c9, 0x00e6, 0x00c6, 0x00f4, 0x00f6, 0x00f2, 0x00fb, 0x00f9,
 117     0x00ff, 0x00d6, 0x00dc, 0x00a2, 0x00a3, 0x00a5, 0x20a7, 0x0192,
 118     0x00e1, 0x00ed, 0x00f3, 0x00fa, 0x00f1, 0x00d1, 0x00aa, 0x00ba,
 119     0x00bf, 0x2310, 0x00ac, 0x00bd, 0x00bc, 0x00a1, 0x00ab, 0x00bb,
 120     0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556,
 121     0x2555, 0x2563, 0x2551, 0x2557, 0x255d, 0x255c, 0x255b, 0x2510,
 122     0x2514, 0x2534, 0x252c, 0x251c, 0x2500, 0x253c, 0x255e, 0x255f,
 123     0x255a, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256c, 0x2567,
 124     0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256b,
 125     0x256a, 0x2518, 0x250c, 0x2588, 0x2584, 0x258c, 0x2590, 0x2580,
 126     0x03b1, 0x00df, 0x0393, 0x03c0, 0x03a3, 0x03c3, 0x00b5, 0x03c4,
 127     0x03a6, 0x0398, 0x03a9, 0x03b4, 0x221e, 0x03c6, 0x03b5, 0x2229,
 128     0x2261, 0x00b1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00f7, 0x2248,
 129     0x00b0, 0x2219, 0x00b7, 0x221a, 0x207f, 0x00b2, 0x25a0, 0x00a0
 130   },
 131   /* User mapping -- default to codes for direct font mapping */
 132   {
 133     0xf000, 0xf001, 0xf002, 0xf003, 0xf004, 0xf005, 0xf006, 0xf007,
 134     0xf008, 0xf009, 0xf00a, 0xf00b, 0xf00c, 0xf00d, 0xf00e, 0xf00f,
 135     0xf010, 0xf011, 0xf012, 0xf013, 0xf014, 0xf015, 0xf016, 0xf017,
 136     0xf018, 0xf019, 0xf01a, 0xf01b, 0xf01c, 0xf01d, 0xf01e, 0xf01f,
 137     0xf020, 0xf021, 0xf022, 0xf023, 0xf024, 0xf025, 0xf026, 0xf027,
 138     0xf028, 0xf029, 0xf02a, 0xf02b, 0xf02c, 0xf02d, 0xf02e, 0xf02f,
 139     0xf030, 0xf031, 0xf032, 0xf033, 0xf034, 0xf035, 0xf036, 0xf037,
 140     0xf038, 0xf039, 0xf03a, 0xf03b, 0xf03c, 0xf03d, 0xf03e, 0xf03f,
 141     0xf040, 0xf041, 0xf042, 0xf043, 0xf044, 0xf045, 0xf046, 0xf047,
 142     0xf048, 0xf049, 0xf04a, 0xf04b, 0xf04c, 0xf04d, 0xf04e, 0xf04f,
 143     0xf050, 0xf051, 0xf052, 0xf053, 0xf054, 0xf055, 0xf056, 0xf057,
 144     0xf058, 0xf059, 0xf05a, 0xf05b, 0xf05c, 0xf05d, 0xf05e, 0xf05f,
 145     0xf060, 0xf061, 0xf062, 0xf063, 0xf064, 0xf065, 0xf066, 0xf067,
 146     0xf068, 0xf069, 0xf06a, 0xf06b, 0xf06c, 0xf06d, 0xf06e, 0xf06f,
 147     0xf070, 0xf071, 0xf072, 0xf073, 0xf074, 0xf075, 0xf076, 0xf077,
 148     0xf078, 0xf079, 0xf07a, 0xf07b, 0xf07c, 0xf07d, 0xf07e, 0xf07f,
 149     0xf080, 0xf081, 0xf082, 0xf083, 0xf084, 0xf085, 0xf086, 0xf087,
 150     0xf088, 0xf089, 0xf08a, 0xf08b, 0xf08c, 0xf08d, 0xf08e, 0xf08f,
 151     0xf090, 0xf091, 0xf092, 0xf093, 0xf094, 0xf095, 0xf096, 0xf097,
 152     0xf098, 0xf099, 0xf09a, 0xf09b, 0xf09c, 0xf09d, 0xf09e, 0xf09f,
 153     0xf0a0, 0xf0a1, 0xf0a2, 0xf0a3, 0xf0a4, 0xf0a5, 0xf0a6, 0xf0a7,
 154     0xf0a8, 0xf0a9, 0xf0aa, 0xf0ab, 0xf0ac, 0xf0ad, 0xf0ae, 0xf0af,
 155     0xf0b0, 0xf0b1, 0xf0b2, 0xf0b3, 0xf0b4, 0xf0b5, 0xf0b6, 0xf0b7,
 156     0xf0b8, 0xf0b9, 0xf0ba, 0xf0bb, 0xf0bc, 0xf0bd, 0xf0be, 0xf0bf,
 157     0xf0c0, 0xf0c1, 0xf0c2, 0xf0c3, 0xf0c4, 0xf0c5, 0xf0c6, 0xf0c7,
 158     0xf0c8, 0xf0c9, 0xf0ca, 0xf0cb, 0xf0cc, 0xf0cd, 0xf0ce, 0xf0cf,
 159     0xf0d0, 0xf0d1, 0xf0d2, 0xf0d3, 0xf0d4, 0xf0d5, 0xf0d6, 0xf0d7,
 160     0xf0d8, 0xf0d9, 0xf0da, 0xf0db, 0xf0dc, 0xf0dd, 0xf0de, 0xf0df,
 161     0xf0e0, 0xf0e1, 0xf0e2, 0xf0e3, 0xf0e4, 0xf0e5, 0xf0e6, 0xf0e7,
 162     0xf0e8, 0xf0e9, 0xf0ea, 0xf0eb, 0xf0ec, 0xf0ed, 0xf0ee, 0xf0ef,
 163     0xf0f0, 0xf0f1, 0xf0f2, 0xf0f3, 0xf0f4, 0xf0f5, 0xf0f6, 0xf0f7,
 164     0xf0f8, 0xf0f9, 0xf0fa, 0xf0fb, 0xf0fc, 0xf0fd, 0xf0fe, 0xf0ff
 165   }
 166 };
 167
 168 /* The standard kernel character-to-font mappings are not invertible
 169    -- this is just a best effort. */
 170
 171 #define MAX_GLYPH 512           /* Max possible glyph value */
 172
 173 static int inv_translate[MAX_NR_CONSOLES];
 174
 175 struct uni_pagedir {
 176         u16             **uni_pgdir[32];
 177         unsigned long   refcount;
 178         unsigned long   sum;
 179         unsigned char   *inverse_translations[4];
 180         u16             *inverse_trans_unicode;
 181         int             readonly;
 182 };
 183
 184 static struct uni_pagedir *dflt;
 185
 186 static void set_inverse_transl(struct vc_data *conp, struct uni_pagedir *p, int i)
 187 {
 188         int j, glyph;
 189         unsigned short *t = translations[i];
 190         unsigned char *q;
 191
 192         if (!p) return;
 193         q = p->inverse_translations[i];
 194
 195         if (!q) {
 196                 q = p->inverse_translations[i] = (unsigned char *)
 197                         kmalloc(MAX_GLYPH, GFP_KERNEL);
 198                 if (!q) return;
 199         }
 200         memset(q, 0, MAX_GLYPH);
 201
 202         for (j = 0; j < E_TABSZ; j++) {
 203                 glyph = conv_uni_to_pc(conp, t[j]);
 204                 if (glyph >= 0 && glyph < MAX_GLYPH && q[glyph] < 32) {
 205                         /* prefer '-' above SHY etc. */
 206                         q[glyph] = j;
 207                 }
 208         }
 209 }
 210
 211 static void set_inverse_trans_unicode(struct vc_data *conp,
 212                                       struct uni_pagedir *p)
 213 {
 214         int i, j, k, glyph;
 215         u16 **p1, *p2;
 216         u16 *q;
 217
 218         if (!p) return;
 219         q = p->inverse_trans_unicode;
 220         if (!q) {
 221                 q = p->inverse_trans_unicode =
 222                         kmalloc(MAX_GLYPH * sizeof(u16), GFP_KERNEL);
 223                 if (!q)
 224                         return;
 225         }
 226         memset(q, 0, MAX_GLYPH * sizeof(u16));
 227
 228         for (i = 0; i < 32; i++) {
 229                 p1 = p->uni_pgdir[i];
 230                 if (!p1)
 231                         continue;
 232                 for (j = 0; j < 32; j++) {
 233                         p2 = p1[j];
 234                         if (!p2)
 235                                 continue;
 236                         for (k = 0; k < 64; k++) {
 237                                 glyph = p2[k];
 238                                 if (glyph >= 0 && glyph < MAX_GLYPH
 239                                                && q[glyph] < 32)
 240                                         q[glyph] = (i << 11) + (j << 6) + k;
 241                         }
 242                 }
 243         }
 244 }
 245
 246 unsigned short *set_translate(int m, struct vc_data *vc)
 247 {
 248         inv_translate[vc->vc_num] = m;
 249         return translations[m];
 250 }
 251
 252 /*
 253  * Inverse translation is impossible for several reasons:
 254  * 1. The font<->character maps are not 1-1.
 255  * 2. The text may have been written while a different translation map
 256  *    was active.
 257  * Still, it is now possible to a certain extent to cut and paste non-ASCII.
 258  */
 259 u16 inverse_translate(struct vc_data *conp, int glyph, int use_unicode)
 260 {
 261         struct uni_pagedir *p;
 262         int m;
 263         if (glyph < 0 || glyph >= MAX_GLYPH)
 264                 return 0;
 265         else if (!(p = (struct uni_pagedir *)*conp->vc_uni_pagedir_loc))
 266                 return glyph;
 267         else if (use_unicode) {
 268                 if (!p->inverse_trans_unicode)
 269                         return glyph;
 270                 else
 271                         return p->inverse_trans_unicode[glyph];
 272         } else {
 273                 m = inv_translate[conp->vc_num];
 274                 if (!p->inverse_translations[m])
 275                         return glyph;
 276                 else
 277                         return p->inverse_translations[m][glyph];
 278         }
 279 }
 280
 281 static void update_user_maps(void)
 282 {
 283         int i;
 284         struct uni_pagedir *p, *q = NULL;
 285
 286         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 287                 if (!vc_cons_allocated(i))
 288                         continue;
 289                 p = (struct uni_pagedir *)*vc_cons[i].d->vc_uni_pagedir_loc;
 290                 if (p && p != q) {
 291                         set_inverse_transl(vc_cons[i].d, p, USER_MAP);
 292                         set_inverse_trans_unicode(vc_cons[i].d, p);
 293                         q = p;
 294                 }
 295         }
 296 }
 297
 298 /*
 299  * Load customizable translation table
 300  * arg points to a 256 byte translation table.
 301  *
 302  * The "old" variants are for translation directly to font (using the
 303  * 0xf000-0xf0ff "transparent" Unicodes) whereas the "new" variants set
 304  * Unicodes explicitly.
 305  */
 306 int con_set_trans_old(unsigned char __user * arg)
 307 {
 308         int i;
 309         unsigned short *p = translations[USER_MAP];
 310
 311         if (!access_ok(VERIFY_READ, arg, E_TABSZ))
 312                 return -EFAULT;
 313
 314         for (i=0; i<E_TABSZ ; i++) {
 315                 unsigned char uc;
 316                 __get_user(uc, arg+i);
 317                 p[i] = UNI_DIRECT_BASE | uc;
 318         }
 319
 320         update_user_maps();
 321         return 0;
 322 }
 323
 324 int con_get_trans_old(unsigned char __user * arg)
 325 {
 326         int i, ch;
 327         unsigned short *p = translations[USER_MAP];
 328
 329         if (!access_ok(VERIFY_WRITE, arg, E_TABSZ))
 330                 return -EFAULT;
 331
 332         for (i=0; i<E_TABSZ ; i++)
 333           {
 334             ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]);
 335             __put_user((ch & ~0xff) ? 0 : ch, arg+i);
 336           }
 337         return 0;
 338 }
 339
 340 int con_set_trans_new(ushort __user * arg)
 341 {
 342         int i;
 343         unsigned short *p = translations[USER_MAP];
 344
 345         if (!access_ok(VERIFY_READ, arg, E_TABSZ*sizeof(unsigned short)))
 346                 return -EFAULT;
 347
 348         for (i=0; i<E_TABSZ ; i++) {
 349                 unsigned short us;
 350                 __get_user(us, arg+i);
 351                 p[i] = us;
 352         }
 353
 354         update_user_maps();
 355         return 0;
 356 }
 357
 358 int con_get_trans_new(ushort __user * arg)
 359 {
 360         int i;
 361         unsigned short *p = translations[USER_MAP];
 362
 363         if (!access_ok(VERIFY_WRITE, arg, E_TABSZ*sizeof(unsigned short)))
 364                 return -EFAULT;
 365
 366         for (i=0; i<E_TABSZ ; i++)
 367           __put_user(p[i], arg+i);
 368
 369         return 0;
 370 }
 371
 372 /*
 373  * Unicode -> current font conversion
 374  *
 375  * A font has at most 512 chars, usually 256.
 376  * But one font position may represent several Unicode chars.
 377  * A hashtable is somewhat of a pain to deal with, so use a
 378  * "paged table" instead.  Simulation has shown the memory cost of
 379  * this 3-level paged table scheme to be comparable to a hash table.
 380  */
 381
 382 extern u8 dfont_unicount[];     /* Defined in console_defmap.c */
 383 extern u16 dfont_unitable[];
 384
 385 static void con_release_unimap(struct uni_pagedir *p)
 386 {
 387         u16 **p1;
 388         int i, j;
 389
 390         if (p == dflt) dflt = NULL;
 391         for (i = 0; i < 32; i++) {
 392                 if ((p1 = p->uni_pgdir[i]) != NULL) {
 393                         for (j = 0; j < 32; j++)
 394                                 kfree(p1[j]);
 395                         kfree(p1);
 396                 }
 397                 p->uni_pgdir[i] = NULL;
 398         }
 399         for (i = 0; i < 4; i++) {
 400                 kfree(p->inverse_translations[i]);
 401                 p->inverse_translations[i] = NULL;
 402         }
 403         if (p->inverse_trans_unicode) {
 404                 kfree(p->inverse_trans_unicode);
 405                 p->inverse_trans_unicode = NULL;
 406         }
 407 }
 408
 409 void con_free_unimap(struct vc_data *vc)
 410 {
 411         struct uni_pagedir *p;
 412
 413         p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
 414         if (!p)
 415                 return;
 416         *vc->vc_uni_pagedir_loc = 0;
 417         if (--p->refcount)
 418                 return;
 419         con_release_unimap(p);
 420         kfree(p);
 421 }
 422
 423 static int con_unify_unimap(struct vc_data *conp, struct uni_pagedir *p)
 424 {
 425         int i, j, k;
 426         struct uni_pagedir *q;
 427
 428         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 429                 if (!vc_cons_allocated(i))
 430                         continue;
 431                 q = (struct uni_pagedir *)*vc_cons[i].d->vc_uni_pagedir_loc;
 432                 if (!q || q == p || q->sum != p->sum)
 433                         continue;
 434                 for (j = 0; j < 32; j++) {
 435                         u16 **p1, **q1;
 436                         p1 = p->uni_pgdir[j]; q1 = q->uni_pgdir[j];
 437                         if (!p1 && !q1)
 438                                 continue;
 439                         if (!p1 || !q1)
 440                                 break;
 441                         for (k = 0; k < 32; k++) {
 442                                 if (!p1[k] && !q1[k])
 443                                         continue;
 444                                 if (!p1[k] || !q1[k])
 445                                         break;
 446                                 if (memcmp(p1[k], q1[k], 64*sizeof(u16)))
 447                                         break;
 448                         }
 449                         if (k < 32)
 450                                 break;
 451                 }
 452                 if (j == 32) {
 453                         q->refcount++;
 454                         *conp->vc_uni_pagedir_loc = (unsigned long)q;
 455                         con_release_unimap(p);
 456                         kfree(p);
 457                         return 1;
 458                 }
 459         }
 460         return 0;
 461 }
 462
 463 static int
 464 con_insert_unipair(struct uni_pagedir *p, u_short unicode, u_short fontpos)
 465 {
 466         int i, n;
 467         u16 **p1, *p2;
 468
 469         if (!(p1 = p->uni_pgdir[n = unicode >> 11])) {
 470                 p1 = p->uni_pgdir[n] = kmalloc(32*sizeof(u16 *), GFP_KERNEL);
 471                 if (!p1) return -ENOMEM;
 472                 for (i = 0; i < 32; i++)
 473                         p1[i] = NULL;
 474         }
 475
 476         if (!(p2 = p1[n = (unicode >> 6) & 0x1f])) {
 477                 p2 = p1[n] = kmalloc(64*sizeof(u16), GFP_KERNEL);
 478                 if (!p2) return -ENOMEM;
 479                 memset(p2, 0xff, 64*sizeof(u16)); /* No glyphs for the characters (yet) */
 480         }
 481
 482         p2[unicode & 0x3f] = fontpos;
 483
 484         p->sum += (fontpos << 20) + unicode;
 485
 486         return 0;
 487 }
 488
 489 /* ui is a leftover from using a hashtable, but might be used again */
 490 int con_clear_unimap(struct vc_data *vc, struct unimapinit *ui)
 491 {
 492         struct uni_pagedir *p, *q;
 493
 494         p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
 495         if (p && p->readonly) return -EIO;
 496         if (!p || --p->refcount) {
 497                 q = kmalloc(sizeof(*p), GFP_KERNEL);
 498                 if (!q) {
 499                         if (p) p->refcount++;
 500                         return -ENOMEM;
 501                 }
 502                 memset(q, 0, sizeof(*q));
 503                 q->refcount=1;
 504                 *vc->vc_uni_pagedir_loc = (unsigned long)q;
 505         } else {
 506                 if (p == dflt) dflt = NULL;
 507                 p->refcount++;
 508                 p->sum = 0;
 509                 con_release_unimap(p);
 510         }
 511         return 0;
 512 }
 513
 514 int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
 515 {
 516         int err = 0, err1, i;
 517         struct uni_pagedir *p, *q;
 518
 519         p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
 520         if (p->readonly) return -EIO;
 521
 522         if (!ct) return 0;
 523
 524         if (p->refcount > 1) {
 525                 int j, k;
 526                 u16 **p1, *p2, l;
 527
 528                 err1 = con_clear_unimap(vc, NULL);
 529                 if (err1) return err1;
 530
 531                 q = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
 532                 for (i = 0, l = 0; i < 32; i++)
 533                 if ((p1 = p->uni_pgdir[i]))
 534                         for (j = 0; j < 32; j++)
 535                         if ((p2 = p1[j]))
 536                                 for (k = 0; k < 64; k++, l++)
 537                                 if (p2[k] != 0xffff) {
 538                                         err1 = con_insert_unipair(q, l, p2[k]);
 539                                         if (err1) {
 540                                                 p->refcount++;
 541                                                 *vc->vc_uni_pagedir_loc = (unsigned long)p;
 542                                                 con_release_unimap(q);
 543                                                 kfree(q);
 544                                                 return err1;
 545                                         }
 546                                 }
 547                 p = q;
 548         } else if (p == dflt)
 549                 dflt = NULL;
 550
 551         while (ct--) {
 552                 unsigned short unicode, fontpos;
 553                 __get_user(unicode, &list->unicode);
 554                 __get_user(fontpos, &list->fontpos);
 555                 if ((err1 = con_insert_unipair(p, unicode,fontpos)) != 0)
 556                         err = err1;
 557                         list++;
 558         }
 559
 560         if (con_unify_unimap(vc, p))
 561                 return err;
 562
 563         for (i = 0; i <= 3; i++)
 564                 set_inverse_transl(vc, p, i); /* Update all inverse translations */
 565         set_inverse_trans_unicode(vc, p);
 566
 567         return err;
 568 }
 569
 570 /* Loads the unimap for the hardware font, as defined in uni_hash.tbl.
 571    The representation used was the most compact I could come up
 572    with.  This routine is executed at sys_setup time, and when the
 573    PIO_FONTRESET ioctl is called. */
 574
 575 int con_set_default_unimap(struct vc_data *vc)
 576 {
 577         int i, j, err = 0, err1;
 578         u16 *q;
 579         struct uni_pagedir *p;
 580
 581         if (dflt) {
 582                 p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
 583                 if (p == dflt)
 584                         return 0;
 585                 dflt->refcount++;
 586                 *vc->vc_uni_pagedir_loc = (unsigned long)dflt;
 587                 if (p && --p->refcount) {
 588                         con_release_unimap(p);
 589                         kfree(p);
 590                 }
 591                 return 0;
 592         }
 593
 594         /* The default font is always 256 characters */
 595
 596         err = con_clear_unimap(vc, NULL);
 597         if (err) return err;
 598
 599         p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
 600         q = dfont_unitable;
 601
 602         for (i = 0; i < 256; i++)
 603                 for (j = dfont_unicount[i]; j; j--) {
 604                         err1 = con_insert_unipair(p, *(q++), i);
 605                         if (err1)
 606                                 err = err1;
 607                 }
 608
 609         if (con_unify_unimap(vc, p)) {
 610                 dflt = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
 611                 return err;
 612         }
 613
 614         for (i = 0; i <= 3; i++)
 615                 set_inverse_transl(vc, p, i);   /* Update all inverse translations */
 616         set_inverse_trans_unicode(vc, p);
 617         dflt = p;
 618         return err;
 619 }
 620 EXPORT_SYMBOL(con_set_default_unimap);
 621
 622 int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc)
 623 {
 624         struct uni_pagedir *q;
 625
 626         if (!*src_vc->vc_uni_pagedir_loc)
 627                 return -EINVAL;
 628         if (*dst_vc->vc_uni_pagedir_loc == *src_vc->vc_uni_pagedir_loc)
 629                 return 0;
 630         con_free_unimap(dst_vc);
 631         q = (struct uni_pagedir *)*src_vc->vc_uni_pagedir_loc;
 632         q->refcount++;
 633         *dst_vc->vc_uni_pagedir_loc = (long)q;
 634         return 0;
 635 }
 636
 637 int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct unipair __user *list)
 638 {
 639         int i, j, k, ect;
 640         u16 **p1, *p2;
 641         struct uni_pagedir *p;
 642
 643         ect = 0;
 644         if (*vc->vc_uni_pagedir_loc) {
 645                 p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
 646                 for (i = 0; i < 32; i++)
 647                 if ((p1 = p->uni_pgdir[i]))
 648                         for (j = 0; j < 32; j++)
 649                         if ((p2 = *(p1++)))
 650                                 for (k = 0; k < 64; k++) {
 651                                         if (*p2 < MAX_GLYPH && ect++ < ct) {
 652                                                 __put_user((u_short)((i<<11)+(j<<6)+k),
 653                                                            &list->unicode);
 654                                                 __put_user((u_short) *p2,
 655                                                            &list->fontpos);
 656                                                 list++;
 657                                         }
 658                                         p2++;
 659                                 }
 660         }
 661         __put_user(ect, uct);
 662         return ((ect <= ct) ? 0 : -ENOMEM);
 663 }
 664
 665 void con_protect_unimap(struct vc_data *vc, int rdonly)
 666 {
 667         struct uni_pagedir *p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
 668
 669         if (p)
 670                 p->readonly = rdonly;
 671 }
 672
 673 /* may be called during an interrupt */
 674 u32 conv_8bit_to_uni(unsigned char c)
 675 {
 676         /*
 677          * Always use USER_MAP. This function is used by the keyboard,
 678          * which shouldn't be affected by G0/G1 switching, etc.
 679          * If the user map still contains default values, i.e. the
 680          * direct-to-font mapping, then assume user is using Latin1.
 681          */
 682         unsigned short uni = translations[USER_MAP][c];
 683         return uni == (0xf000 | c) ? c : uni;
 684 }
 685
 686 int
 687 conv_uni_to_pc(struct vc_data *conp, long ucs)
 688 {
 689         int h;
 690         u16 **p1, *p2;
 691         struct uni_pagedir *p;
 692
 693         /* Only 16-bit codes supported at this time */
 694         if (ucs > 0xffff)
 695                 return -4;              /* Not found */
 696         else if (ucs < 0x20)
 697                 return -1;              /* Not a printable character */
 698         else if (ucs == 0xfeff || (ucs >= 0x200b && ucs <= 0x200f))
 699                 return -2;                      /* Zero-width space */
 700         /*
 701          * UNI_DIRECT_BASE indicates the start of the region in the User Zone
 702          * which always has a 1:1 mapping to the currently loaded font.  The
 703          * UNI_DIRECT_MASK indicates the bit span of the region.
 704          */
 705         else if ((ucs & ~UNI_DIRECT_MASK) == UNI_DIRECT_BASE)
 706                 return ucs & UNI_DIRECT_MASK;
 707
 708         if (!*conp->vc_uni_pagedir_loc)
 709                 return -3;
 710
 711         p = (struct uni_pagedir *)*conp->vc_uni_pagedir_loc;
 712         if ((p1 = p->uni_pgdir[ucs >> 11]) &&
 713             (p2 = p1[(ucs >> 6) & 0x1f]) &&
 714             (h = p2[ucs & 0x3f]) < MAX_GLYPH)
 715                 return h;
 716
 717         return -4;              /* not found */
 718 }
 719
 720 /*
 721  * This is called at sys_setup time, after memory and the console are
 722  * initialized.  It must be possible to call kmalloc(..., GFP_KERNEL)
 723  * from this function, hence the call from sys_setup.
 724  */
 725 void __init
 726 console_map_init(void)
 727 {
 728         int i;
 729
 730         for (i = 0; i < MAX_NR_CONSOLES; i++)
 731                 if (vc_cons_allocated(i) && !*vc_cons[i].d->vc_uni_pagedir_loc)
 732                         con_set_default_unimap(vc_cons[i].d);
 733 }
 734
 735 EXPORT_SYMBOL(con_copy_unimap);