arch/x86/boot/regs.c

   1 /* -----------------------------------------------------------------------
   2  *
   3  *   Copyright 2009 Intel Corporation; author H. Peter Anvin
   4  *
   5  *   This file is part of the Linux kernel, and is made available under
   6  *   the terms of the GNU General Public License version 2 or (at your
   7  *   option) any later version; incorporated herein by reference.
   8  *
   9  * ----------------------------------------------------------------------- */
  10
  11 /*
  12  * Simple helper function for initializing a register set.
  13  *
  14  * Note that this sets EFLAGS_CF in the input register set; this
  15  * makes it easier to catch functions which do nothing but don't
  16  * explicitly set CF.
  17  */
  18
  19 #include "boot.h"
  20 #include "string.h"
  21
  22 void initregs(struct biosregs *reg)
  23 {
  24         memset(reg, 0, sizeof *reg);
  25         reg->eflags |= X86_EFLAGS_CF;
  26         reg->ds = ds();
  27         reg->es = ds();
  28         reg->fs = fs();
  29         reg->gs = gs();
  30 }