com32/modules/sanboot.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2008 H. Peter Anvin - All Rights Reserved
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
   8  *   Boston MA 02110-1301, USA; either version 2 of the License, or
   9  *   (at your option) any later version; incorporated herein by reference.
  10  *
  11  * ----------------------------------------------------------------------- */
  12
  13 /*
  14  * sanboot.c
  15  *
  16  * Invoke the gPXE "sanboot" command, if available.
  17  */
  18
  19 #include <alloca.h>
  20 #include <inttypes.h>
  21 #include <stdio.h>
  22 #include <console.h>
  23 #include <com32.h>
  24 #include <string.h>
  25 #include <sys/gpxe.h>
  26
  27 struct segoff16 {
  28     uint16_t offs, seg;
  29 };
  30
  31 struct s_PXENV_FILE_EXEC {
  32     uint16_t Status;
  33     struct segoff16 Command;
  34 };
  35
  36 static void sanboot(const char **args)
  37 {
  38     char *q;
  39     struct s_PXENV_FILE_EXEC *fx;
  40     com32sys_t reg;
  41
  42     memset(&reg, 0, sizeof reg);
  43
  44     fx = __com32.cs_bounce;
  45     q = (char *)(fx + 1);
  46
  47     fx->Status = 1;
  48     fx->Command.offs = OFFS(q);
  49     fx->Command.seg = SEG(q);
  50
  51     q = stpcpy(q, "sanboot");
  52
  53     while (*args) {
  54         *q++ = ' ';
  55         q = stpcpy(q, *args);
  56         args++;
  57     }
  58
  59     memset(&reg, 0, sizeof reg);
  60     reg.eax.w[0] = 0x0009;
  61     reg.ebx.w[0] = 0x00e5;      /* PXENV_FILE_EXEC */
  62     reg.edi.w[0] = OFFS(fx);
  63     reg.es = SEG(fx);
  64
  65     __intcall(0x22, &reg, &reg);
  66
  67     /* This should not return... */
  68 }
  69
  70 int main(int argc, const char *argv[])
  71 {
  72     openconsole(&dev_null_r, &dev_stdcon_w);
  73
  74     if (argc < 2) {
  75         printf("Usage: sanboot rootpath\n");
  76         return 1;
  77     }
  78
  79     if (!is_gpxe()) {
  80         printf("sanboot: gPXE API not detected\n");
  81         return 1;
  82     }
  83
  84     sanboot(argv + 1);
  85
  86     /* sanboot() should not return... */
  87     printf("SAN boot failed.\n");
  88     return 1;
  89 }