com32/lib/syslinux/shuffle_pm.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2007 H. Peter Anvin - All Rights Reserved
   4  *
   5  *   Permission is hereby granted, free of charge, to any person
   6  *   obtaining a copy of this software and associated documentation
   7  *   files (the "Software"), to deal in the Software without
   8  *   restriction, including without limitation the rights to use,
   9  *   copy, modify, merge, publish, distribute, sublicense, and/or
  10  *   sell copies of the Software, and to permit persons to whom
  11  *   the Software is furnished to do so, subject to the following
  12  *   conditions:
  13  *
  14  *   The above copyright notice and this permission notice shall
  15  *   be included in all copies or substantial portions of the Software.
  16  *
  17  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  19  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  21  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  22  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  *   OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * ----------------------------------------------------------------------- */
  27
  28 /*
  29  * shuffle_pm.c
  30  *
  31  * Shuffle and boot to protected mode code
  32  */
  33
  34 #include <stdlib.h>
  35 #include <inttypes.h>
  36 #include <com32.h>
  37 #include <string.h>
  38 #include <syslinux/movebits.h>
  39 #include <syslinux/bootpm.h>
  40
  41 int syslinux_shuffle_boot_pm(struct syslinux_movelist *fraglist,
  42                              struct syslinux_memmap *memmap,
  43                              uint16_t bootflags,
  44                              struct syslinux_pm_regs *regs)
  45 {
  46   int nd;
  47   com32sys_t ireg;
  48   char *regbuf;
  49
  50   nd = syslinux_prepare_shuffle(fraglist, memmap);
  51   if (nd < 0)
  52     return -1;
  53
  54   regbuf = (char *)__com32.cs_bounce + (12*nd);
  55   memcpy(regbuf, regs, sizeof(*regs));
  56
  57   memset(&ireg, 0, sizeof ireg);
  58
  59   ireg.eax.w[0] = 0x001a;
  60   ireg.edx.w[0] = bootflags;
  61   ireg.es       = SEG(__com32.cs_bounce);
  62   ireg.edi.l    = OFFS(__com32.cs_bounce);
  63   ireg.ecx.l    = nd;
  64   ireg.ds       = SEG(regbuf);
  65   ireg.esi.l    = OFFS(regbuf);
  66   __intcall(0x22, &ireg, NULL);
  67
  68   return -1;                    /* Too many descriptors? */
  69 }