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1 /* ----------------------------------------------------------------------- *
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2 *
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3 * Copyright 2009 Pascal Bellard - All Rights Reserved
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4 *
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5 * This program is free software; you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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8 * Boston MA 02110-1301, USA; either version 2 of the License, or
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9 * (at your option) any later version; incorporated herein by reference.
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10 *
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11 * ----------------------------------------------------------------------- */
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12
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13 /*
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14 * ifmem.c
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15 *
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16 * Run one command if the memory is large enought, and another if it isn't.
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17 *
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18 * Usage:
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19 *
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20 * label boot_kernel
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21 * kernel ifmem.c
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22 * append size_in_KB boot_large [size_in_KB boot_medium] boot_small
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23 *
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24 * label boot_large
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25 * kernel vmlinuz_large_memory
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26 * append ...
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27 *
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28 * label boot_small
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29 * kernel vmlinuz_small_memory
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30 * append ...
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31 */
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32
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33 #include <inttypes.h>
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34 #include <com32.h>
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35 #include <console.h>
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36 #include <stdio.h>
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37 #include <string.h>
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38 #include <alloca.h>
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39 #include <stdlib.h>
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40 #include <syslinux/boot.h>
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41
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42 static unsigned long memory_size(void)
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43 {
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44 com32sys_t ireg, oreg;
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45
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46 memset(&ireg, 0, sizeof ireg);
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47
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48 ireg.eax.w[0] = 0xe801;
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49 __intcall(0x15, &ireg, &oreg);
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50
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51 return oreg.ecx.w[0] + ( oreg.edx.w[0] << 6);
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52 }
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53
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54 int main(int argc, char *argv[])
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55 {
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56 char *s;
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57 int i;
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58
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59 for (s = argv[1]; *s && (*s < '0' || *s > '9'); s++);
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60
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61 if (argc < 4 || !*s) {
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62 openconsole(&dev_null_r, &dev_stdcon_w);
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63 perror("\nUsage: ifmem.c32 size_KB boot_large_memory boot_small_memory\n");
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64 return 1;
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65 }
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66
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67 # find target according to ram size
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68 for (i = 1; i + 2 < argc; ) {
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69 i++; // size
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70 if (memory_size() >= strtoul(s, NULL, 0)) break;
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71 s = argv[++i];
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72 }
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73
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74 # find and copy extra parameters to command line
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75 # assume last parameter is "noram"
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76 for (s = argv[i]; i < argc; i++) {
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77 if (!strcmp(argv[i],"noram") && ++i < argc) {
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78 #define SZ 512
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79 static char cmdline[SZ];
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80 char *p = cmdline, *q = s;
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81 int j;
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82 for (j = i; j <= argc; j++) {
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83 while (*q && p < cmdline + SZ -1) *p++ = *q++;
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84 if (p < cmdline + SZ -1) *p++ = ' ';
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85 q = argv[j];
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86 }
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87 *p++ = 0;
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88 s = cmdline;
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89 }
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90 }
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91
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92 if (s) syslinux_run_command(s);
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93 else syslinux_run_default();
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94 return -1;
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95 }
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