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1.1 root 1: /*
2: Copyright (c) 2008 TrueCrypt Foundation. All rights reserved.
3:
4: Governed by the TrueCrypt License 2.4 the full text of which is contained
5: in the file License.txt included in TrueCrypt binary and source code
6: distribution packages.
7: */
8:
9: #include "Platform.h"
10: #include "Bios.h"
11: #include "BootConsoleIo.h"
12: #include "BootDebug.h"
13:
14:
15: static int ScreenOutputDisabled = 0;
16:
17: void DisableScreenOutput ()
18: {
19: ++ScreenOutputDisabled;
20: }
21:
22:
23: void EnableScreenOutput ()
24: {
25: --ScreenOutputDisabled;
26: }
27:
28:
29: void PrintChar (char c)
30: {
31: #ifdef TC_TRACING_ENABLED
32: WriteDebugPort (c);
33: #endif
34:
35: if (ScreenOutputDisabled)
36: return;
37:
38: __asm
39: {
40: xor bx, bx
41: mov al, c
42: mov ah, 0xe
43: int 0x10
44: }
45: }
46:
47:
48: void PrintCharAtCusor (char c)
49: {
50: __asm
51: {
52: xor bx, bx
53: mov al, c
54: mov cx, 1
55: mov ah, 0xa
56: int 0x10
57: }
58: }
59:
60:
61: void Print (const char *str)
62: {
63: char c;
64: while (c = *str++)
65: PrintChar (c);
66: }
67:
68:
69: void Print (uint32 number)
70: {
71: char str[12];
72: int pos = 0;
73: while (number >= 10)
74: {
75: str[pos++] = (number % 10) + '0';
76: number /= 10;
77: }
78: str[pos] = (number % 10) + '0';
79:
80: while (pos >= 0)
81: PrintChar (str[pos--]);
82: }
83:
84:
85: void Print (const uint64 &number)
86: {
87: if (number.HighPart == 0)
88: Print (number.LowPart);
89: else
90: PrintHex (number);
91: }
92:
93:
94: void PrintHex (byte b)
95: {
96: PrintChar (((b >> 4) >= 0xA ? 'A' - 0xA : '0') + (b >> 4));
97: PrintChar (((b & 0xF) >= 0xA ? 'A' - 0xA : '0') + (b & 0xF));
98: }
99:
100:
101: void PrintHex (uint16 data)
102: {
103: PrintHex (byte (data >> 8));
104: PrintHex (byte (data));
105: }
106:
107:
108: void PrintHex (uint32 data)
109: {
110: PrintHex (uint16 (data >> 16));
111: PrintHex (uint16 (data));
112: }
113:
114:
115: void PrintHex (const uint64 &data)
116: {
117: PrintHex (data.HighPart);
118: PrintHex (data.LowPart);
119: }
120:
121: void PrintRepeatedChar (char c, int n)
122: {
123: while (n-- > 0)
124: PrintChar (c);
125: }
126:
127:
128: void PrintEndl ()
129: {
130: Print ("\r\n");
131: }
132:
133:
134: void PrintEndl (int cnt)
135: {
136: while (cnt-- > 0)
137: PrintEndl ();
138: }
139:
140:
141: void Beep ()
142: {
143: PrintChar (7);
144: }
145:
146:
147: void ClearScreen ()
148: {
149: __asm
150: {
151: mov bh, 7
152: xor cx, cx
153: mov dx, 0x184f
154: mov ax, 0x600
155: int 0x10
156:
157: xor bh, bh
158: xor dx, dx
159: mov ah, 2
160: int 0x10
161: }
162: }
163:
164:
165: void PrintBackspace ()
166: {
167: PrintChar (TC_BIOS_CHAR_BACKSPACE);
168: PrintCharAtCusor (' ');
169: }
170:
171:
172: void PrintError (const char *message, bool beep, bool newLine)
173: {
174: Print ("Error: ");
175: Print (message);
176:
177: if (newLine)
178: PrintEndl();
179:
180: if (beep)
181: Beep();
182: }
183:
184:
185: byte GetShiftFlags ()
186: {
187: byte flags;
188: __asm
189: {
190: mov ah, 2
191: int 0x16
192: mov flags, al
193: }
194:
195: return flags;
196: }
197:
198:
199: byte GetKeyboardChar (byte *scanCode)
200: {
201: byte asciiCode;
202: byte scan;
203: __asm
204: {
205: mov ah, 0
206: int 0x16
207: mov asciiCode, al
208: mov scan, ah
209: }
210:
211: if (scanCode)
212: *scanCode = scan;
213:
214: return asciiCode;
215: }
216:
217:
218: bool IsKeyboardCharAvailable ()
219: {
220: bool available = false;
221: __asm
222: {
223: mov ah, 1
224: int 0x16
225: jz not_avail
226: mov available, true
227: not_avail:
228: }
229:
230: return available;
231: }
232:
233:
1.1.1.2 ! root 234: void ClearBiosKeystrokeBuffer ()
! 235: {
! 236: __asm
! 237: {
! 238: push es
! 239: xor ax, ax
! 240: mov es, ax
! 241: mov di, 0x41e
! 242: mov cx, 32
! 243: cld
! 244: rep stosb
! 245: pop es
! 246: }
! 247: }
! 248:
! 249:
1.1 root 250: bool IsPrintable (char c)
251: {
252: return c >= ' ' && c <= '~';
253: }
254:
255:
256: int GetString (char *buffer, size_t bufferSize)
257: {
258: byte c;
259: byte scanCode;
260: size_t pos = 0;
261:
262: while (pos < bufferSize)
263: {
264: c = GetKeyboardChar (&scanCode);
265:
266: if (scanCode == TC_BIOS_KEY_ENTER)
267: break;
268:
269: if (scanCode == TC_BIOS_KEY_ESC)
270: return 0;
271:
272: buffer[pos++] = c;
273: PrintChar (IsPrintable (c) ? c : ' ');
274: }
275:
276: return pos;
277: }
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