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voyager.c

/* -*- linux-c -*- ------------------------------------------------------- *
 *
 *   Copyright (C) 1991, 1992 Linus Torvalds
 *   Copyright 2007 rPath, Inc. - All Rights Reserved
 *
 *   This file is part of the Linux kernel, and is made available under
 *   the terms of the GNU General Public License version 2.
 *
 * ----------------------------------------------------------------------- */

/*
 * arch/i386/boot/voyager.c
 *
 * Get the Voyager config information
 */

#include "boot.h"

#ifdef CONFIG_X86_VOYAGER

int query_voyager(void)
{
      u8 err;
      u16 es, di;
      /* Abuse the apm_bios_info area for this */
      u8 *data_ptr = (u8 *)&boot_params.apm_bios_info;

      data_ptr[0] = 0xff;     /* Flag on config not found(?) */

      asm("pushw %%es ; "
          "int $0x15 ; "
          "setc %0 ; "
          "movw %%es, %1 ; "
          "popw %%es"
          : "=q" (err), "=r" (es), "=D" (di)
          : "a" (0xffc0));

      if (err)
            return -1;  /* Not Voyager */

      set_fs(es);
      copy_from_fs(data_ptr, di, 7);      /* Table is 7 bytes apparently */
      return 0;
}

#endif /* CONFIG_X86_VOYAGER */

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