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095593c0 SR |
1 | /* |
2 | * Copyright (c) 2012 The Chromium OS Authors. | |
3 | * | |
4 | * (C) Copyright 2008-2011 | |
5 | * Graeme Russ, <graeme.russ@gmail.com> | |
6 | * | |
7 | * (C) Copyright 2002 | |
8 | * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> | |
9 | * | |
10 | * Portions of this file are derived from the Linux kernel source | |
11 | * Copyright (C) 1991, 1992 Linus Torvalds | |
12 | * | |
1a459660 | 13 | * SPDX-License-Identifier: GPL-2.0+ |
095593c0 SR |
14 | */ |
15 | ||
16 | #ifndef __X86_CONTROL_REGS_H | |
17 | #define __X86_CONTROL_REGS_H | |
18 | ||
19 | /* | |
20 | * The memory clobber prevents the GCC from reordering the read/write order | |
21 | * of CR0 | |
22 | */ | |
23 | static inline unsigned long read_cr0(void) | |
24 | { | |
25 | unsigned long val; | |
26 | ||
27 | asm volatile ("movl %%cr0, %0" : "=r" (val) : : "memory"); | |
28 | return val; | |
29 | } | |
30 | ||
31 | static inline void write_cr0(unsigned long val) | |
32 | { | |
33 | asm volatile ("movl %0, %%cr0" : : "r" (val) : "memory"); | |
34 | } | |
35 | ||
36 | static inline unsigned long read_cr2(void) | |
37 | { | |
38 | unsigned long val; | |
39 | ||
40 | asm volatile("mov %%cr2,%0\n\t" : "=r" (val) : : "memory"); | |
41 | return val; | |
42 | } | |
43 | ||
44 | static inline unsigned long read_cr3(void) | |
45 | { | |
46 | unsigned long val; | |
47 | ||
48 | asm volatile("mov %%cr3,%0\n\t" : "=r" (val) : : "memory"); | |
49 | return val; | |
50 | } | |
51 | ||
52 | static inline unsigned long read_cr4(void) | |
53 | { | |
54 | unsigned long val; | |
55 | ||
56 | asm volatile("mov %%cr4,%0\n\t" : "=r" (val) : : "memory"); | |
57 | return val; | |
58 | } | |
59 | ||
60 | static inline unsigned long get_debugreg(int regno) | |
61 | { | |
62 | unsigned long val = 0; /* Damn you, gcc! */ | |
63 | ||
64 | switch (regno) { | |
65 | case 0: | |
66 | asm("mov %%db0, %0" : "=r" (val)); | |
67 | break; | |
68 | case 1: | |
69 | asm("mov %%db1, %0" : "=r" (val)); | |
70 | break; | |
71 | case 2: | |
72 | asm("mov %%db2, %0" : "=r" (val)); | |
73 | break; | |
74 | case 3: | |
75 | asm("mov %%db3, %0" : "=r" (val)); | |
76 | break; | |
77 | case 6: | |
78 | asm("mov %%db6, %0" : "=r" (val)); | |
79 | break; | |
80 | case 7: | |
81 | asm("mov %%db7, %0" : "=r" (val)); | |
82 | break; | |
83 | default: | |
84 | val = 0; | |
85 | } | |
86 | return val; | |
87 | } | |
88 | ||
89 | #endif |