diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:16:45 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:16:45 +0200 |
| commit | 96ae6ea0be1b902c28b3b463c27da42b41e2b63a (patch) | |
| tree | fbc18761d4fa93d7b0f6dbf3496289fa32bd363a /arch/x86/boot/mca.c | |
| parent | i386: move boot (diff) | |
| download | linux-96ae6ea0be1b902c28b3b463c27da42b41e2b63a.tar.xz linux-96ae6ea0be1b902c28b3b463c27da42b41e2b63a.zip | |
i386: move boot
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/boot/mca.c')
| -rw-r--r-- | arch/x86/boot/mca.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/x86/boot/mca.c b/arch/x86/boot/mca.c new file mode 100644 index 000000000000..68222f2d4b67 --- /dev/null +++ b/arch/x86/boot/mca.c @@ -0,0 +1,43 @@ +/* -*- 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/mca.c + * + * Get the MCA system description table + */ + +#include "boot.h" + +int query_mca(void) +{ + u8 err; + u16 es, bx, len; + + asm("pushw %%es ; " + "int $0x15 ; " + "setc %0 ; " + "movw %%es, %1 ; " + "popw %%es" + : "=acd" (err), "=acdSD" (es), "=b" (bx) + : "a" (0xc000)); + + if (err) + return -1; /* No MCA present */ + + set_fs(es); + len = rdfs16(bx); + + if (len > sizeof(boot_params.sys_desc_table)) + len = sizeof(boot_params.sys_desc_table); + + copy_from_fs(&boot_params.sys_desc_table, bx, len); + return 0; +} |