root/arch/x86/boot/voyager.c

DEFINITIONS

1. query_voyager

/* -*- 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.
 *
 * ----------------------------------------------------------------------- */

/*
 * Get the Voyager config information
 */

#include "boot.h"

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;
}