com32/menu/execute.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2004-2008 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 #include <stdlib.h>
  14 #include <string.h>
  15 #include <com32.h>
  16 #include "menu.h"
  17
  18 void execute(const char *cmdline, enum kernel_type type)
  19 {
  20     com32sys_t ireg;
  21     const char *p, *const *pp;
  22     char *q = __com32.cs_bounce;
  23     const char *kernel, *args;
  24
  25     memset(&ireg, 0, sizeof ireg);
  26
  27     kernel = q;
  28     p = cmdline;
  29     while (*p && !my_isspace(*p)) {
  30         *q++ = *p++;
  31     }
  32     *q++ = '\0';
  33
  34     args = q;
  35     while (*p && my_isspace(*p))
  36         p++;
  37
  38     strcpy(q, p);
  39
  40     if (kernel[0] == '.' && type == KT_NONE) {
  41         /* It might be a type specifier */
  42         enum kernel_type type = KT_NONE;
  43         for (pp = kernel_types; *pp; pp++, type++) {
  44             if (!strcmp(kernel + 1, *pp)) {
  45                 execute(p, type);       /* Strip the type specifier and retry */
  46             }
  47         }
  48     }
  49
  50     if (type == KT_LOCALBOOT) {
  51         ireg.eax.w[0] = 0x0014; /* Local boot */
  52         ireg.edx.w[0] = strtoul(kernel, NULL, 0);
  53     } else {
  54         if (type < KT_KERNEL)
  55             type = KT_KERNEL;
  56
  57         ireg.eax.w[0] = 0x0016; /* Run kernel image */
  58         ireg.esi.w[0] = OFFS(kernel);
  59         ireg.ds = SEG(kernel);
  60         ireg.ebx.w[0] = OFFS(args);
  61         ireg.es = SEG(args);
  62         ireg.edx.l = type - KT_KERNEL;
  63         /* ireg.ecx.l    = 0; *//* We do ipappend "manually" */
  64     }
  65
  66     __intcall(0x22, &ireg, NULL);
  67
  68     /* If this returns, something went bad; return to menu */
  69 }