1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (c) 2012 The Chromium OS Authors.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * (C) Copyright 2008-2011
5*4882a593Smuzhiyun * Graeme Russ, <graeme.russ@gmail.com>
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * (C) Copyright 2002
8*4882a593Smuzhiyun * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
9*4882a593Smuzhiyun *
10*4882a593Smuzhiyun * Portions of this file are derived from the Linux kernel source
11*4882a593Smuzhiyun * Copyright (C) 1991, 1992 Linus Torvalds
12*4882a593Smuzhiyun *
13*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
14*4882a593Smuzhiyun */
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #ifndef __X86_CONTROL_REGS_H
17*4882a593Smuzhiyun #define __X86_CONTROL_REGS_H
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun /*
20*4882a593Smuzhiyun * The memory clobber prevents the GCC from reordering the read/write order
21*4882a593Smuzhiyun * of CR0
22*4882a593Smuzhiyun */
read_cr0(void)23*4882a593Smuzhiyun static inline unsigned long read_cr0(void)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun unsigned long val;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun asm volatile ("movl %%cr0, %0" : "=r" (val) : : "memory");
28*4882a593Smuzhiyun return val;
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
write_cr0(unsigned long val)31*4882a593Smuzhiyun static inline void write_cr0(unsigned long val)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun asm volatile ("movl %0, %%cr0" : : "r" (val) : "memory");
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
read_cr2(void)36*4882a593Smuzhiyun static inline unsigned long read_cr2(void)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun unsigned long val;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun asm volatile("mov %%cr2,%0\n\t" : "=r" (val) : : "memory");
41*4882a593Smuzhiyun return val;
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
read_cr3(void)44*4882a593Smuzhiyun static inline unsigned long read_cr3(void)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun unsigned long val;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun asm volatile("mov %%cr3,%0\n\t" : "=r" (val) : : "memory");
49*4882a593Smuzhiyun return val;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
read_cr4(void)52*4882a593Smuzhiyun static inline unsigned long read_cr4(void)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun unsigned long val;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun asm volatile("mov %%cr4,%0\n\t" : "=r" (val) : : "memory");
57*4882a593Smuzhiyun return val;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
get_debugreg(int regno)60*4882a593Smuzhiyun static inline unsigned long get_debugreg(int regno)
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun unsigned long val = 0; /* Damn you, gcc! */
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun switch (regno) {
65*4882a593Smuzhiyun case 0:
66*4882a593Smuzhiyun asm("mov %%db0, %0" : "=r" (val));
67*4882a593Smuzhiyun break;
68*4882a593Smuzhiyun case 1:
69*4882a593Smuzhiyun asm("mov %%db1, %0" : "=r" (val));
70*4882a593Smuzhiyun break;
71*4882a593Smuzhiyun case 2:
72*4882a593Smuzhiyun asm("mov %%db2, %0" : "=r" (val));
73*4882a593Smuzhiyun break;
74*4882a593Smuzhiyun case 3:
75*4882a593Smuzhiyun asm("mov %%db3, %0" : "=r" (val));
76*4882a593Smuzhiyun break;
77*4882a593Smuzhiyun case 6:
78*4882a593Smuzhiyun asm("mov %%db6, %0" : "=r" (val));
79*4882a593Smuzhiyun break;
80*4882a593Smuzhiyun case 7:
81*4882a593Smuzhiyun asm("mov %%db7, %0" : "=r" (val));
82*4882a593Smuzhiyun break;
83*4882a593Smuzhiyun default:
84*4882a593Smuzhiyun val = 0;
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun return val;
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun #endif
90