linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * consolemap.c

 *

 * Mapping from internal code (such as Latin-1 or Unicode or IBM PC code)

 * to font positions.

 *

 * aeb, 950210

 *

 * Support for multiple unimaps by Jakub Jelinek <jj@ultra.linux.cz>, July 1998

 *

 * Fix bug in inverse translation. Stanislav Voronyi <stas@cnti.uanet.kharkov.ua>, Dec 1998

 *

 * In order to prevent the following circular lock dependency:

 *   &mm->mmap_sem --> cpu_hotplug.lock --> console_lock --> &mm->mmap_sem

 *

 * We cannot allow page fault to happen while holding the console_lock.

 * Therefore, all the userspace copy operations have to be done outside

 * the console_lock critical sections.

 *

 * As all the affected functions are all called directly from vt_ioctl(), we

 * can allocate some small buffers directly on stack without worrying about

 * stack overflow.

 */

​

#include <linux/module.h>

#include <linux/kd.h>

#include <linux/errno.h>

#include <linux/mm.h>

#include <linux/slab.h>

#include <linux/init.h>

#include <linux/tty.h>

#include <linux/uaccess.h>

#include <linux/console.h>

#include <linux/consolemap.h>

#include <linux/vt_kern.h>

#include <linux/string.h>

​

static unsigned short translations[][256] = {

  /* 8-bit Latin-1 mapped to Unicode -- trivial mapping */

  {

    0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,

    0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,

    0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,

    0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,

    0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,

    0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,

    0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,

    0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,

    0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,

    0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,

    0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,

    0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,

    0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,

    0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,

    0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,

    0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x007f,

    0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,

    0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,

    0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,

    0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,

    0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,

    0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,