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337496eb PA |
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 | ||
21 | int 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" | |
5593eaa8 | 35 | : "=q" (err), "=r" (es), "=D" (di) |
337496eb PA |
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 */ |