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annotate loadtools/simatr.c @ 1000:39a6090a052a

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doc/How-flash-really-works: article written
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Dec 2023 09:08:19 +0000
parents a31ae776de6e
children
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rev   line source
790
0bbe0213812d fc-simint put together, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * This module implements the stage in fc-simint where ATR bytes
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Mychaela Falconia <falcon@freecalypso.org>
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3 * received from simagent are validated.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9
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Mychaela Falconia <falcon@freecalypso.org>
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10 extern int sim_allow_spenh;
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11
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12 extern u_char sim_atr[];
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13 extern unsigned sim_atr_len;
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14
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Mychaela Falconia <falcon@freecalypso.org>
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15 void
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16 sim_atr_validate()
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17 {
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18 unsigned b, p, y, nhist, have_tck;
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19
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20 if (sim_atr_len < 2) {
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21 too_short: fprintf(stderr, "error: ATR from simagent is too short\n");
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22 exit(1);
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23 }
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24 b = sim_atr[1];
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25 p = 2;
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Mychaela Falconia <falcon@freecalypso.org>
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26 nhist = b & 0xF;
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27 y = b & 0xF0;
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28 have_tck = 0;
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29 while (y) {
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Mychaela Falconia <falcon@freecalypso.org>
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30 if (y & 0x10) {
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Mychaela Falconia <falcon@freecalypso.org>
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31 if (p >= sim_atr_len)
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Mychaela Falconia <falcon@freecalypso.org>
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32 goto too_short;
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Mychaela Falconia <falcon@freecalypso.org>
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33 p++;
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Mychaela Falconia <falcon@freecalypso.org>
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34 }
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Mychaela Falconia <falcon@freecalypso.org>
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35 if (y & 0x20) {
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Mychaela Falconia <falcon@freecalypso.org>
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36 if (p >= sim_atr_len)
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Mychaela Falconia <falcon@freecalypso.org>
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37 goto too_short;
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38 p++;
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39 }
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Mychaela Falconia <falcon@freecalypso.org>
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40 if (y & 0x40) {
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41 if (p >= sim_atr_len)
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42 goto too_short;
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43 p++;
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Mychaela Falconia <falcon@freecalypso.org>
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44 }
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Mychaela Falconia <falcon@freecalypso.org>
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45 if (y & 0x80) {
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Mychaela Falconia <falcon@freecalypso.org>
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46 if (p >= sim_atr_len)
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Mychaela Falconia <falcon@freecalypso.org>
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47 goto too_short;
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Mychaela Falconia <falcon@freecalypso.org>
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48 b = sim_atr[p++];
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49 y = b & 0xF0;
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Mychaela Falconia <falcon@freecalypso.org>
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50 if (b & 0x0F)
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Mychaela Falconia <falcon@freecalypso.org>
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51 have_tck = 1;
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52 } else
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Mychaela Falconia <falcon@freecalypso.org>
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53 y = 0;
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54 }
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Mychaela Falconia <falcon@freecalypso.org>
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55 p += nhist + have_tck;
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Mychaela Falconia <falcon@freecalypso.org>
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56 if (p > sim_atr_len)
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57 goto too_short;
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Mychaela Falconia <falcon@freecalypso.org>
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58 if (p < sim_atr_len) {
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59 fprintf(stderr, "error: ATR from simagent is too long\n");
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60 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
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61 }
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Mychaela Falconia <falcon@freecalypso.org>
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62 if (!have_tck)
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Mychaela Falconia <falcon@freecalypso.org>
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63 return;
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Mychaela Falconia <falcon@freecalypso.org>
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64 /* validate TCK */
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Mychaela Falconia <falcon@freecalypso.org>
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65 b = 0;
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66 for (p = 1; p < sim_atr_len; p++)
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67 b ^= sim_atr[p];
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Mychaela Falconia <falcon@freecalypso.org>
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68 if (b) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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69 fprintf(stderr, "error: ATR checksum is bad\n");
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70 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
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71 }
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Mychaela Falconia <falcon@freecalypso.org>
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72 }
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Mychaela Falconia <falcon@freecalypso.org>
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73
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Mychaela Falconia <falcon@freecalypso.org>
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74 void
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Mychaela Falconia <falcon@freecalypso.org>
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75 sim_spenh_logic()
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Mychaela Falconia <falcon@freecalypso.org>
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76 {
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Mychaela Falconia <falcon@freecalypso.org>
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77 static char *targv[2] = {"spenh", 0};
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78
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Mychaela Falconia <falcon@freecalypso.org>
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79 if (sim_atr_len < 3 || !(sim_atr[1] & 0x10) || (sim_atr[2] < 0x94)) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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80 printf("ATR indicates no support for speed enhancement\n");
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Mychaela Falconia <falcon@freecalypso.org>
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81 return;
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Mychaela Falconia <falcon@freecalypso.org>
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82 }
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Mychaela Falconia <falcon@freecalypso.org>
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83 if (!sim_allow_spenh) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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84 printf("Speed enhancement disabled with -n option\n");
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Mychaela Falconia <falcon@freecalypso.org>
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85 return;
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Mychaela Falconia <falcon@freecalypso.org>
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86 }
791
a31ae776de6e fc-simint: tell the user when we are requesting spenh
Mychaela Falconia <falcon@freecalypso.org>
parents: 790
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87 printf("Requesting SIM speed enhancement\n");
790
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Mychaela Falconia <falcon@freecalypso.org>
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88 tpinterf_make_cmd(targv);
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Mychaela Falconia <falcon@freecalypso.org>
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89 if (tpinterf_send_cmd() < 0)
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Mychaela Falconia <falcon@freecalypso.org>
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90 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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91 if (tpinterf_pass_output(10))
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Mychaela Falconia <falcon@freecalypso.org>
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92 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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93 }