tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
5 *
6 * This file is part of the Linux kernel, and is made available under
7 * the terms of the GNU General Public License version 2.
8 *
9 * ----------------------------------------------------------------------- */
10
11/*
12 * Get the Voyager config information
13 */
14
15#include "boot.h"
16
17int query_voyager(void)
18{
19 u8 err;
20 u16 es, di;
21 /* Abuse the apm_bios_info area for this */
22 u8 *data_ptr = (u8 *)&boot_params.apm_bios_info;
23
24 data_ptr[0] = 0xff; /* Flag on config not found(?) */
25
26 asm("pushw %%es ; "
27 "int $0x15 ; "
28 "setc %0 ; "
29 "movw %%es, %1 ; "
30 "popw %%es"
31 : "=q" (err), "=r" (es), "=D" (di)
32 : "a" (0xffc0));
33
34 if (err)
35 return -1; /* Not Voyager */
36
37 set_fs(es);
38 copy_from_fs(data_ptr, di, 7); /* Table is 7 bytes apparently */
39 return 0;
40}