Voyager support for the new x86 setup code

Voyager support for the new x86 setup code.  This implements the same
functionality as the assembly version.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/i386/boot/voyager.c

+/* -*- 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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * arch/i386/boot/voyager.c
+ *
+ * Get the Voyager config information
+ */
+
+#include "boot.h"
+
+#ifdef CONFIG_X86_VOYAGER
+
+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"
+	    : "=qm" (err), "=rm" (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;
+}
+
+#endif /* CONFIG_X86_VOYAGER */