lib/efi_selftest/efi_selftest_console.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * EFI efi_selftest
   4  *
   5  * Copyright (c) 2017 Heinrich Schuchardt <xypron.glpk@gmx.de>
   6  */
   7
   8 #include <efi_selftest.h>
   9 #include <net.h>
  10 #include <vsprintf.h>
  11
  12 struct efi_simple_text_output_protocol *con_out;
  13 struct efi_simple_text_input_protocol *con_in;
  14
  15 /*
  16  * Print a MAC address to an u16 string
  17  *
  18  * @pointer: mac address
  19  * @buf: pointer to buffer address
  20  * on return position of terminating zero word
  21  */
  22 static void mac(void *pointer, u16 **buf)
  23 {
  24         int i, j;
  25         u16 c;
  26         u8 *p = (u8 *)pointer;
  27         u8 byte;
  28         u16 *pos = *buf;
  29
  30         for (i = 0; i < ARP_HLEN; ++i) {
  31                 if (i)
  32                         *pos++ = ':';
  33                 byte = p[i];
  34                 for (j = 4; j >= 0; j -= 4) {
  35                         c = (byte >> j) & 0x0f;
  36                         c += '0';
  37                         if (c > '9')
  38                                 c += 'a' - '9' - 1;
  39                         *pos++ = c;
  40                 }
  41         }
  42         *pos = 0;
  43         *buf = pos;
  44 }
  45
  46 /*
  47  * printx() - print hexadecimal number to an u16 string
  48  *
  49  * @p:          value to print
  50  * @prec:       minimum number of digits to print
  51  * @buf:        pointer to buffer address,
  52  *              on return position of terminating zero word
  53  */
  54 static void printx(u64 p, int prec, u16 **buf)
  55 {
  56         int i;
  57         u16 c;
  58         u16 *pos = *buf;
  59
  60         for (i = 2 * sizeof(p) - 1; i >= 0; --i) {
  61                 c = (p >> (4 * i)) & 0x0f;
  62                 if (c || pos != *buf || !i || i < prec) {
  63                         c += '0';
  64                         if (c > '9')
  65                                 c += 'a' - '9' - 1;
  66                         *pos++ = c;
  67                 }
  68         }
  69         *pos = 0;
  70         *buf = pos;
  71 }
  72
  73 /*
  74  * Print an unsigned 32bit value as decimal number to an u16 string
  75  *
  76  * @value:      value to be printed
  77  * @prec:       minimum number of digits to display
  78  * @buf:        pointer to buffer address
  79  *              on return position of terminating zero word
  80  */
  81 static void uint2dec(u32 value, int prec, u16 **buf)
  82 {
  83         u16 *pos = *buf;
  84         int i;
  85         u16 c;
  86         u64 f;
  87
  88         /*
  89          * Increment by .5 and multiply with
  90          * (2 << 60) / 1,000,000,000 = 0x44B82FA0.9B5A52CC
  91          * to move the first digit to bit 60-63.
  92          */
  93         f = 0x225C17D0;
  94         f += (0x9B5A52DULL * value) >> 28;
  95         f += 0x44B82FA0ULL * value;
  96
  97         for (i = 0; i < 10; ++i) {
  98                 /* Write current digit */
  99                 c = f >> 60;
 100                 if (c || pos != *buf || 10 - i <= prec)
 101                         *pos++ = c + '0';
 102                 /* Eliminate current digit */
 103                 f &= 0xfffffffffffffff;
 104                 /* Get next digit */
 105                 f *= 0xaULL;
 106         }
 107         if (pos == *buf)
 108                 *pos++ = '0';
 109         *pos = 0;
 110         *buf = pos;
 111 }
 112
 113 /*
 114  * Print a signed 32bit value as decimal number to an u16 string
 115  *
 116  * @value:      value to be printed
 117  * @prec:       minimum number of digits to display
 118  * @buf:        pointer to buffer address
 119  * on return position of terminating zero word
 120  */
 121 static void int2dec(s32 value, int prec, u16 **buf)
 122 {
 123         u32 u;
 124         u16 *pos = *buf;
 125
 126         if (value < 0) {
 127                 *pos++ = '-';
 128                 u = -value;
 129         } else {
 130                 u = value;
 131         }
 132         uint2dec(u, prec, &pos);
 133         *buf = pos;
 134 }
 135
 136 /*
 137  * Print a colored formatted string to the EFI console
 138  *
 139  * @color       color, see constants in efi_api.h, use -1 for no color
 140  * @fmt         format string
 141  * @...         optional arguments
 142  */
 143 void efi_st_printc(int color, const char *fmt, ...)
 144 {
 145         va_list args;
 146         u16 buf[160];
 147         const char *c;
 148         u16 *pos = buf;
 149         const char *s;
 150         u16 *u;
 151         int prec;
 152
 153         va_start(args, fmt);
 154
 155         if (color >= 0)
 156                 con_out->set_attribute(con_out, (unsigned long)color);
 157         c = fmt;
 158         for (; *c; ++c) {
 159                 switch (*c) {
 160                 case '\\':
 161                         ++c;
 162                         switch (*c) {
 163                         case '\0':
 164                                 --c;
 165                                 break;
 166                         case 'n':
 167                                 *pos++ = '\n';
 168                                 break;
 169                         case 'r':
 170                                 *pos++ = '\r';
 171                                 break;
 172                         case 't':
 173                                 *pos++ = '\t';
 174                                 break;
 175                         default:
 176                                 *pos++ = *c;
 177                         }
 178                         break;
 179                 case '%':
 180                         ++c;
 181                         /* Parse precision */
 182                         if (*c == '.') {
 183                                 ++c;
 184                                 prec = *c - '0';
 185                                 ++c;
 186                         } else {
 187                                 prec = 0;
 188                         }
 189                         switch (*c) {
 190                         case '\0':
 191                                 --c;
 192                                 break;
 193                         case 'd':
 194                                 int2dec(va_arg(args, s32), prec, &pos);
 195                                 break;
 196                         case 'p':
 197                                 ++c;
 198                                 switch (*c) {
 199                                 /* MAC address */
 200                                 case 'm':
 201                                         mac(va_arg(args, void*), &pos);
 202                                         break;
 203
 204                                 /* u16 string */
 205                                 case 's':
 206                                         u = va_arg(args, u16*);
 207                                         if (pos > buf) {
 208                                                 *pos = 0;
 209                                                 con_out->output_string(con_out,
 210                                                                        buf);
 211                                         }
 212                                         con_out->output_string(con_out, u);
 213                                         pos = buf;
 214                                         break;
 215                                 default:
 216                                         --c;
 217                                         printx((uintptr_t)va_arg(args, void *),
 218                                                2 * sizeof(void *), &pos);
 219                                         break;
 220                                 }
 221                                 break;
 222                         case 's':
 223                                 s = va_arg(args, const char *);
 224                                 for (; *s; ++s)
 225                                         *pos++ = *s;
 226                                 break;
 227                         case 'u':
 228                                 uint2dec(va_arg(args, u32), prec, &pos);
 229                                 break;
 230                         case 'x':
 231                                 printx((u64)va_arg(args, unsigned int),
 232                                        prec, &pos);
 233                                 break;
 234                         default:
 235                                 break;
 236                         }
 237                         break;
 238                 default:
 239                         *pos++ = *c;
 240                 }
 241         }
 242         va_end(args);
 243         *pos = 0;
 244         con_out->output_string(con_out, buf);
 245         if (color >= 0)
 246                 con_out->set_attribute(con_out, EFI_LIGHTGRAY);
 247 }
 248
 249 /*
 250  * Reads an Unicode character from the input device.
 251  *
 252  * @return: Unicode character
 253  */
 254 u16 efi_st_get_key(void)
 255 {
 256         struct efi_input_key input_key;
 257         efi_status_t ret;
 258
 259         /* Wait for next key */
 260         do {
 261                 ret = con_in->read_key_stroke(con_in, &input_key);
 262         } while (ret == EFI_NOT_READY);
 263         return input_key.unicode_char;
 264 }