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annotate rvinterf/etmsync/interf.c @ 568:ae24e49c41a9

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L1: l1_sync.c compiles for XIP
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 10 Aug 2014 17:52:59 +0000
parents f77480d3dd21
children
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277
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1 /*
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2 * In this module we implement our synchronous interface to the target
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3 * via rvinterf.
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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 #include <unistd.h>
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10 #include "limits.h"
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11 #include "localsock.h"
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12 #include "pktmux.h"
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13 #include "exitcodes.h"
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14
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15 extern int sock;
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16
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17 int rx_enable_state;
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18 u_char rvi_msg[LOCALSOCK_MAX_MSG];
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19 int rvi_msg_len;
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20
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21 static void
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22 collect_bytes_from_rvi(buf, nbytes)
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23 u_char *buf;
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24 {
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25 int cc;
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26
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27 while (nbytes) {
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28 cc = read(sock, buf, nbytes);
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29 if (cc <= 0) {
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30 perror("read from rvinterf socket");
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31 exit(ERROR_RVINTERF);
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32 }
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33 buf += cc;
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34 nbytes -= cc;
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35 }
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36 }
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37
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38 collect_rvi_msg()
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39 {
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40 u_char lenbuf[2];
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41
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42 collect_bytes_from_rvi(lenbuf, 2);
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43 rvi_msg_len = lenbuf[0] << 8 | lenbuf[1];
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44 if (rvi_msg_len < 1 || rvi_msg_len > LOCALSOCK_MAX_MSG) {
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45 fprintf(stderr, "Invalid length from rvinterf: %02X%02X\n",
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46 lenbuf[0], lenbuf[1]);
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47 exit(ERROR_RVINTERF);
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48 }
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49 collect_bytes_from_rvi(rvi_msg, rvi_msg_len);
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50 return(0);
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51 }
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52
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53 send_rvimisc_command(cmdpkt, cmdlen)
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54 u_char *cmdpkt;
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55 {
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56 u_char lenbuf[2];
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57
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58 lenbuf[0] = 0;
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59 lenbuf[1] = cmdlen;
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60 write(sock, lenbuf, 2);
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61 write(sock, cmdpkt, cmdlen);
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62 }
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63
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64 rx_control(enable)
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65 {
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66 u_char cmdpkt[2];
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67 int cmdlen;
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68
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69 /* are we already in the desired state? */
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70 if (rx_enable_state == enable)
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71 return(0);
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72 /* no, do the work */
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73 if (enable) {
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74 cmdpkt[0] = CLI2RVI_WANT_MUXPROTO;
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75 cmdpkt[1] = RVT_TM_HEADER;
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76 cmdlen = 2;
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77 } else {
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78 cmdpkt[0] = CLI2RVI_RESET_PACKET_RX;
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79 cmdlen = 1;
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80 }
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81 send_rvimisc_command(cmdpkt, cmdlen);
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82 collect_rvi_msg();
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83 if (rvi_msg[0] != RVI2CLI_LOCAL_CMD_RESP || rvi_msg_len < 2) {
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84 fprintf(stderr,
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85 "error: unexpected response to rvinterf local command\n");
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86 exit(ERROR_RVINTERF);
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87 }
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88 if (rvi_msg[1] != '+') {
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89 fprintf(stderr, "Error from rvinterf: %.*s\n", rvi_msg_len - 1,
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90 rvi_msg + 1);
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91 exit(ERROR_RVINTERF);
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92 }
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93 rx_enable_state = enable;
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94 return(0);
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95 }
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96
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97 send_pkt_to_target(pkt, pktlen)
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98 u_char *pkt;
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99 {
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100 u_char hdrbuf[3];
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101 int len1;
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102
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103 len1 = pktlen + 1;
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104 hdrbuf[0] = len1 >> 8;
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105 hdrbuf[1] = len1 & 0xFF;
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106 hdrbuf[2] = CLI2RVI_PKT_TO_TARGET;
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107 write(sock, hdrbuf, 3);
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108 write(sock, pkt, pktlen);
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109 }
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110
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111 target_pkt_exch(outpkt, outpktlen)
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112 u_char *outpkt;
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113 {
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114 rx_control(1);
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115 send_pkt_to_target(outpkt, outpktlen);
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116 collect_rvi_msg();
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117 if (rvi_msg[0] != RVI2CLI_PKT_FROM_TARGET) {
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118 fprintf(stderr,
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119 "error: unexpected response type from rvinterf\n");
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120 exit(ERROR_RVINTERF);
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121 }
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122 return(0);
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123 }
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124
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125 etm_pkt_exch(outbuf, outlen)
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126 u_char *outbuf;
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127 {
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128 int i, c;
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129
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130 outbuf[0] = RVT_TM_HEADER;
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131 c = 0;
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132 for (i = 1; i <= outlen; i++)
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133 c ^= outbuf[i];
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134 outbuf[i] = c;
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135 target_pkt_exch(outbuf, outlen + 2);
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136 if (rvi_msg[1] != RVT_TM_HEADER) {
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137 printf("error: packet from target is not ETM!\n");
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138 return(ERROR_TARGET);
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139 }
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140 if (rvi_msg_len < 5) {
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141 printf("error: ETM response packet is too short\n");
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142 return(ERROR_TARGET);
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143 }
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144 c = 0;
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145 for (i = 2; i < rvi_msg_len; i++)
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146 c ^= rvi_msg[i];
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147 if (c) {
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148 printf("ETM response checksum error!\n");
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149 return(ERROR_TARGET);
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150 }
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151 if (rvi_msg[2] != outbuf[1]) {
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152 printf("error: target response is from wrong ETM component\n");
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153 return(ERROR_TARGET);
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154 }
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155 return(0);
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156 }