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-rw-r--r--arch/x86/boot/voyager.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/x86/boot/voyager.c b/arch/x86/boot/voyager.c
new file mode 100644
index 000000000000..61c8fe0453be
--- /dev/null
+++ b/arch/x86/boot/voyager.c
@@ -0,0 +1,46 @@
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 * arch/i386/boot/voyager.c
13 *
14 * Get the Voyager config information
15 */
16
17#include "boot.h"
18
19#ifdef CONFIG_X86_VOYAGER
20
21int query_voyager(void)
22{
23 u8 err;
24 u16 es, di;
25 /* Abuse the apm_bios_info area for this */
26 u8 *data_ptr = (u8 *)&boot_params.apm_bios_info;
27
28 data_ptr[0] = 0xff; /* Flag on config not found(?) */
29
30 asm("pushw %%es ; "
31 "int $0x15 ; "
32 "setc %0 ; "
33 "movw %%es, %1 ; "
34 "popw %%es"
35 : "=q" (err), "=r" (es), "=D" (di)
36 : "a" (0xffc0));
37
38 if (err)
39 return -1; /* Not Voyager */
40
41 set_fs(es);
42 copy_from_fs(data_ptr, di, 7); /* Table is 7 bytes apparently */
43 return 0;
44}
45
46#endif /* CONFIG_X86_VOYAGER */