Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / x86 / boot / mca.c

diff --git a/kernel/arch/x86/boot/mca.c b/kernel/arch/x86/boot/mca.c
new file mode 100644 (file)
index 0000000..a95a531
--- /dev/null
+++ b/kernel/arch/x86/boot/mca.c
@@ -0,0 +1,38 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright (C) 1991, 1992 Linus Torvalds
+ *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *   Copyright 2009 Intel Corporation; author H. Peter Anvin
+ *
+ *   This file is part of the Linux kernel, and is made available under
+ *   the terms of the GNU General Public License version 2.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * Get the MCA system description table
+ */
+
+#include "boot.h"
+
+int query_mca(void)
+{
+       struct biosregs ireg, oreg;
+       u16 len;
+
+       initregs(&ireg);
+       ireg.ah = 0xc0;
+       intcall(0x15, &ireg, &oreg);
+
+       if (oreg.eflags & X86_EFLAGS_CF)
+               return -1;      /* No MCA present */
+
+       set_fs(oreg.es);
+       len = rdfs16(oreg.bx);
+
+       if (len > sizeof(boot_params.sys_desc_table))
+               len = sizeof(boot_params.sys_desc_table);
+
+       copy_from_fs(&boot_params.sys_desc_table, oreg.bx, len);
+       return 0;
+}