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[u-boot] / lib / efi_selftest / efi_selftest_console.c
1 /*
2  * EFI efi_selftest
3  *
4  * Copyright (c) 2017 Heinrich Schuchardt <xypron.glpk@gmx.de>
5  *
6  * SPDX-License-Identifier:     GPL-2.0+
7  */
8
9 #include <efi_selftest.h>
10 #include <vsprintf.h>
11
12 struct efi_simple_text_output_protocol *con_out;
13 struct efi_simple_input_interface *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  * Print a pointer to an u16 string
48  *
49  * @pointer: pointer
50  * @buf: pointer to buffer address
51  * on return position of terminating zero word
52  */
53 static void pointer(void *pointer, u16 **buf)
54 {
55         int i;
56         u16 c;
57         uintptr_t p = (uintptr_t)pointer;
58         u16 *pos = *buf;
59
60         for (i = 8 * sizeof(p) - 4; i >= 0; i -= 4) {
61                 c = (p >> i) & 0x0f;
62                 c += '0';
63                 if (c > '9')
64                         c += 'a' - '9' - 1;
65                 *pos++ = c;
66         }
67         *pos = 0;
68         *buf = pos;
69 }
70
71 /*
72  * Print an unsigned 32bit value as decimal number to an u16 string
73  *
74  * @value: value to be printed
75  * @buf: pointer to buffer address
76  * on return position of terminating zero word
77  */
78 static void uint2dec(u32 value, u16 **buf)
79 {
80         u16 *pos = *buf;
81         int i;
82         u16 c;
83         u64 f;
84
85         /*
86          * Increment by .5 and multiply with
87          * (2 << 60) / 1,000,000,000 = 0x44B82FA0.9B5A52CC
88          * to move the first digit to bit 60-63.
89          */
90         f = 0x225C17D0;
91         f += (0x9B5A52DULL * value) >> 28;
92         f += 0x44B82FA0ULL * value;
93
94         for (i = 0; i < 10; ++i) {
95                 /* Write current digit */
96                 c = f >> 60;
97                 if (c || pos != *buf)
98                         *pos++ = c + '0';
99                 /* Eliminate current digit */
100                 f &= 0xfffffffffffffff;
101                 /* Get next digit */
102                 f *= 0xaULL;
103         }
104         if (pos == *buf)
105                 *pos++ = '0';
106         *pos = 0;
107         *buf = pos;
108 }
109
110 /*
111  * Print a signed 32bit value as decimal number to an u16 string
112  *
113  * @value: value to be printed
114  * @buf: pointer to buffer address
115  * on return position of terminating zero word
116  */
117 static void int2dec(s32 value, u16 **buf)
118 {
119         u32 u;
120         u16 *pos = *buf;
121
122         if (value < 0) {
123                 *pos++ = '-';
124                 u = -value;
125         } else {
126                 u = value;
127         }
128         uint2dec(u, &pos);
129         *buf = pos;
130 }
131
132 /*
133  * Print a formatted string to the EFI console
134  *
135  * @fmt: format string
136  * @...: optional arguments
137  */
138 void efi_st_printf(const char *fmt, ...)
139 {
140         va_list args;
141         u16 buf[160];
142         const char *c;
143         u16 *pos = buf;
144         const char *s;
145         const u16 *u;
146
147         va_start(args, fmt);
148
149         c = fmt;
150         for (; *c; ++c) {
151                 switch (*c) {
152                 case '\\':
153                         ++c;
154                         switch (*c) {
155                         case '\0':
156                                 --c;
157                                 break;
158                         case 'n':
159                                 *pos++ = '\n';
160                                 break;
161                         case 'r':
162                                 *pos++ = '\r';
163                                 break;
164                         case 't':
165                                 *pos++ = '\t';
166                                 break;
167                         default:
168                                 *pos++ = *c;
169                         }
170                         break;
171                 case '%':
172                         ++c;
173                         switch (*c) {
174                         case '\0':
175                                 --c;
176                                 break;
177                         case 'd':
178                                 int2dec(va_arg(args, s32), &pos);
179                                 break;
180                         case 'p':
181                                 ++c;
182                                 switch (*c) {
183                                 /* MAC address */
184                                 case 'm':
185                                         mac(va_arg(args, void*), &pos);
186                                         break;
187
188                                 /* u16 string */
189                                 case 's':
190                                         u = va_arg(args, u16*);
191                                         /* Ensure string fits into buffer */
192                                         for (; *u && pos < buf + 120; ++u)
193                                                 *pos++ = *u;
194                                         break;
195                                 default:
196                                         --c;
197                                         pointer(va_arg(args, void*), &pos);
198                                 }
199                                 break;
200                         case 's':
201                                 s = va_arg(args, const char *);
202                                 for (; *s; ++s)
203                                         *pos++ = *s;
204                                 break;
205                         case 'u':
206                                 uint2dec(va_arg(args, u32), &pos);
207                                 break;
208                         default:
209                                 break;
210                         }
211                         break;
212                 default:
213                         *pos++ = *c;
214                 }
215         }
216         va_end(args);
217         *pos = 0;
218         con_out->output_string(con_out, buf);
219 }
220
221 /*
222  * Reads an Unicode character from the input device.
223  *
224  * @return: Unicode character
225  */
226 u16 efi_st_get_key(void)
227 {
228         struct efi_input_key input_key;
229         efi_status_t ret;
230
231         /* Wait for next key */
232         do {
233                 ret = con_in->read_key_stroke(con_in, &input_key);
234         } while (ret == EFI_NOT_READY);
235         return input_key.unicode_char;
236 }