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H. Peter Anvin
authored and
Linus Torvalds
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Jul 12, 2007
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refs/heads/master: 449f2ab946b5ffbc357d815e8e3cce8def642984 | ||
refs/heads/master: 337496eb73ec970fe008095fdb2b2af60a2a7fa3 |
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/* -*- 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. | ||
* | ||
* ----------------------------------------------------------------------- */ | ||
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/* | ||
* arch/i386/boot/voyager.c | ||
* | ||
* Get the Voyager config information | ||
*/ | ||
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#include "boot.h" | ||
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#ifdef CONFIG_X86_VOYAGER | ||
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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; | ||
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data_ptr[0] = 0xff; /* Flag on config not found(?) */ | ||
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asm("pushw %%es ; " | ||
"int $0x15 ; " | ||
"setc %0 ; " | ||
"movw %%es, %1 ; " | ||
"popw %%es" | ||
: "=qm" (err), "=rm" (es), "=D" (di) | ||
: "a" (0xffc0)); | ||
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if (err) | ||
return -1; /* Not Voyager */ | ||
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set_fs(es); | ||
copy_from_fs(data_ptr, di, 7); /* Table is 7 bytes apparently */ | ||
return 0; | ||
} | ||
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#endif /* CONFIG_X86_VOYAGER */ |