FreeCalypso > hg > freecalypso-tools
annotate loadtools/ttypassthru.c @ 416:30f6d1c32c6f
doc/Flash-boot-defect article removed (no longer relevant)
This article is no longer relevant because the issue in question
only affected one (1) defective FCDEV3B board which was not
and never will be sold.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 26 Oct 2018 07:11:08 +0000 |
parents | e7502631a0f9 |
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1 /* |
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2 * This module implements the pass-thru operation mode, in which |
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3 * the Unix host tty is cross-connected directly to the target |
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4 * running some code we have just loaded. |
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5 */ |
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6 |
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7 #include <sys/types.h> |
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8 #include <sys/ioctl.h> |
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9 #include <sys/errno.h> |
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10 #include <termios.h> |
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11 #include <stdio.h> |
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12 #include <stdlib.h> |
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13 #include <unistd.h> |
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14 #include <strings.h> |
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15 |
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16 extern int errno; |
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17 |
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18 extern int target_fd; |
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19 |
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20 static struct termios saved_termios, my_termios; |
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21 |
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22 static void |
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23 safe_output(buf, cc) |
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24 u_char *buf; |
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25 { |
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26 int i, c; |
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27 |
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28 for (i = 0; i < cc; i++) { |
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29 c = buf[i]; |
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30 if (c == '\r' || c == '\n' || c == '\t' || c == '\b') { |
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31 putchar(c); |
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32 continue; |
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33 } |
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34 if (c & 0x80) { |
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35 putchar('M'); |
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36 putchar('-'); |
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37 c &= 0x7F; |
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38 } |
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39 if (c < 0x20) { |
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40 putchar('^'); |
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41 putchar(c + '@'); |
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42 } else if (c == 0x7F) { |
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43 putchar('^'); |
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44 putchar('?'); |
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45 } else |
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46 putchar(c); |
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47 } |
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48 fflush(stdout); |
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49 } |
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50 |
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51 static void |
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52 loop() |
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53 { |
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54 char buf[BUFSIZ]; |
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55 fd_set fds, fds1; |
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56 register int i, cc, max; |
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57 |
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58 FD_ZERO(&fds); |
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59 FD_SET(0, &fds); |
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60 FD_SET(target_fd, &fds); |
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61 max = target_fd + 1; |
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62 for (;;) { |
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63 bcopy(&fds, &fds1, sizeof(fd_set)); |
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64 i = select(max, &fds1, NULL, NULL, NULL); |
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65 if (i < 0) { |
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66 if (errno == EINTR) |
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67 continue; |
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68 tcsetattr(0, TCSAFLUSH, &saved_termios); |
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69 perror("select"); |
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70 exit(1); |
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71 } |
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72 if (FD_ISSET(0, &fds1)) { |
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73 cc = read(0, buf, sizeof buf); |
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74 if (cc <= 0) |
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75 return; |
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76 if (cc == 1 && buf[0] == 0x1C) |
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77 return; |
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78 write(target_fd, buf, cc); |
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79 } |
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80 if (FD_ISSET(target_fd, &fds1)) { |
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81 cc = read(target_fd, buf, sizeof buf); |
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82 if (cc <= 0) { |
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83 tcsetattr(0, TCSAFLUSH, &saved_termios); |
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84 fprintf(stderr, "EOF/error on target tty\n"); |
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85 exit(1); |
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86 } |
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87 safe_output(buf, cc); |
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88 } |
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89 } |
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90 } |
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91 |
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92 tty_passthru() |
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93 { |
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94 static int zero = 0; |
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95 |
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96 ioctl(target_fd, FIONBIO, &zero); |
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97 |
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98 tcgetattr(0, &saved_termios); |
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99 bcopy(&saved_termios, &my_termios, sizeof(struct termios)); |
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100 cfmakeraw(&my_termios); |
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101 my_termios.c_cc[VMIN] = 1; |
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102 my_termios.c_cc[VTIME] = 0; |
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103 tcsetattr(0, TCSAFLUSH, &my_termios); |
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104 |
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105 printf("Entering tty pass-thru; type ^\\ to exit\r\n\n"); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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106 loop(); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
107 tcsetattr(0, TCSAFLUSH, &saved_termios); |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
108 return 0; |
e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
109 } |