xref: /OK3568_Linux_fs/kernel/arch/x86/boot/regs.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /* -----------------------------------------------------------------------
3*4882a593Smuzhiyun  *
4*4882a593Smuzhiyun  *   Copyright 2009 Intel Corporation; author H. Peter Anvin
5*4882a593Smuzhiyun  *
6*4882a593Smuzhiyun  * ----------------------------------------------------------------------- */
7*4882a593Smuzhiyun 
8*4882a593Smuzhiyun /*
9*4882a593Smuzhiyun  * Simple helper function for initializing a register set.
10*4882a593Smuzhiyun  *
11*4882a593Smuzhiyun  * Note that this sets EFLAGS_CF in the input register set; this
12*4882a593Smuzhiyun  * makes it easier to catch functions which do nothing but don't
13*4882a593Smuzhiyun  * explicitly set CF.
14*4882a593Smuzhiyun  */
15*4882a593Smuzhiyun 
16*4882a593Smuzhiyun #include "boot.h"
17*4882a593Smuzhiyun #include "string.h"
18*4882a593Smuzhiyun 
initregs(struct biosregs * reg)19*4882a593Smuzhiyun void initregs(struct biosregs *reg)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun 	memset(reg, 0, sizeof(*reg));
22*4882a593Smuzhiyun 	reg->eflags |= X86_EFLAGS_CF;
23*4882a593Smuzhiyun 	reg->ds = ds();
24*4882a593Smuzhiyun 	reg->es = ds();
25*4882a593Smuzhiyun 	reg->fs = fs();
26*4882a593Smuzhiyun 	reg->gs = gs();
27*4882a593Smuzhiyun }
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