FreeCalypso > hg > freecalypso-tools

annotate target-utils/libload/cmd_memload.c @ 90:8dc062c6359b

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target-utils/libc: memcpy16 and memcpy32 optimized variants implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 28 Oct 2016 23:02:44 +0000
parents e7502631a0f9
children 9214118ae941
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Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This module implements the ML (memory load) command, which will be
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3 * used by fc-chainload.
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4 *
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5 * The sole argument to the ML command is the body of an S3 record
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6 * with the initial "S3" characters stripped, i.e., starting with the
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7 * "count" byte, followed by the address, data and checksum bytes
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8 * exactly as in the original S3 record.
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9 */
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10
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11 #include "types.h"
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12
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13 void
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14 cmd_memload(argbulk)
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15 char *argbulk;
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16 {
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17 char *argv[2], *s;
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18 u8 srecbin[256], cksum;
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19 int len, i, c;
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20 u32 addr;
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21
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22 if (parse_args(argbulk, 1, 1, argv, 0) < 0)
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23 return;
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24 s = argv[0];
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25 if (decode_hex_digits(s, 2, &len) < 0) {
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26 inv: printf("ERROR: ML argument is invalid\n");
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27 return;
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28 }
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29 s += 2;
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30 if (len < 6)
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31 goto inv;
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32 srecbin[0] = len;
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33 for (i = 1; i <= len; i++) {
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34 if (decode_hex_digits(s, 2, &c) < 0)
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35 goto inv;
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36 s += 2;
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37 srecbin[i] = c;
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38 }
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39 cksum = 0;
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40 for (i = 0; i <= len; i++)
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41 cksum += srecbin[i];
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42 if (cksum != 0xFF) {
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43 printf("ERROR: bad ML S-record checksum\n");
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44 return;
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45 }
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46 len -= 5;
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47 addr = ((u32)srecbin[1] << 24) |
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48 ((u32)srecbin[2] << 16) |
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49 ((u32)srecbin[3] << 8) |
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50 (u32)srecbin[4];
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51 bcopy(srecbin + 5, addr, len);
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52 }