arch/x86/boot/regs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* -----------------------------------------------------------------------
   3  *
   4  *   Copyright 2009 Intel Corporation; author H. Peter Anvin
   5  *
   6  * ----------------------------------------------------------------------- */
   7
   8 /*
   9  * Simple helper function for initializing a register set.
  10  *
  11  * Note that this sets EFLAGS_CF in the input register set; this
  12  * makes it easier to catch functions which do nothing but don't
  13  * explicitly set CF.
  14  */
  15
  16 #include "boot.h"
  17 #include "string.h"
  18
  19 void initregs(struct biosregs *reg)
  20 {
  21         memset(reg, 0, sizeof(*reg));
  22         reg->eflags |= X86_EFLAGS_CF;
  23         reg->ds = ds();
  24         reg->es = ds();
  25         reg->fs = fs();
  26         reg->gs = gs();
  27 }