x86/boot/regs.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /* -----------------------------------------------------------------------
0003  *
0004  *   Copyright 2009 Intel Corporation; author H. Peter Anvin
0005  *
0006  * ----------------------------------------------------------------------- */
0007
0008 /*
0009  * Simple helper function for initializing a register set.
0010  *
0011  * Note that this sets EFLAGS_CF in the input register set; this
0012  * makes it easier to catch functions which do nothing but don't
0013  * explicitly set CF.
0014  */
0015
0016 #include "boot.h"
0017 #include "string.h"
0018
0019 void initregs(struct biosregs *reg)
0020 {
0021     memset(reg, 0, sizeof(*reg));
0022     reg->eflags |= X86_EFLAGS_CF;
0023     reg->ds = ds();
0024     reg->es = ds();
0025     reg->fs = fs();
0026     reg->gs = gs();
0027 }