1
2#ifndef _ASM_X86_SPECIAL_INSNS_H
3#define _ASM_X86_SPECIAL_INSNS_H
4
5
6#ifdef __KERNEL__
7
8#include <asm/nops.h>
9#include <asm/processor-flags.h>
10#include <linux/jump_label.h>
11
12
13
14
15
16
17
18
19extern unsigned long __force_order;
20
21void native_write_cr0(unsigned long val);
22
23static inline unsigned long native_read_cr0(void)
24{
25 unsigned long val;
26 asm volatile("mov %%cr0,%0\n\t" : "=r" (val), "=m" (__force_order));
27 return val;
28}
29
30static inline unsigned long native_read_cr2(void)
31{
32 unsigned long val;
33 asm volatile("mov %%cr2,%0\n\t" : "=r" (val), "=m" (__force_order));
34 return val;
35}
36
37static inline void native_write_cr2(unsigned long val)
38{
39 asm volatile("mov %0,%%cr2": : "r" (val), "m" (__force_order));
40}
41
42static inline unsigned long __native_read_cr3(void)
43{
44 unsigned long val;
45 asm volatile("mov %%cr3,%0\n\t" : "=r" (val), "=m" (__force_order));
46 return val;
47}
48
49static inline void native_write_cr3(unsigned long val)
50{
51 asm volatile("mov %0,%%cr3": : "r" (val), "m" (__force_order));
52}
53
54static inline unsigned long native_read_cr4(void)
55{
56 unsigned long val;
57#ifdef CONFIG_X86_32
58
59
60
61
62
63 asm volatile("1: mov %%cr4, %0\n"
64 "2:\n"
65 _ASM_EXTABLE(1b, 2b)
66 : "=r" (val), "=m" (__force_order) : "0" (0));
67#else
68
69 asm volatile("mov %%cr4,%0\n\t" : "=r" (val), "=m" (__force_order));
70#endif
71 return val;
72}
73
74void native_write_cr4(unsigned long val);
75
76#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
77static inline u32 rdpkru(void)
78{
79 u32 ecx = 0;
80 u32 edx, pkru;
81
82
83
84
85
86 asm volatile(".byte 0x0f,0x01,0xee\n\t"
87 : "=a" (pkru), "=d" (edx)
88 : "c" (ecx));
89 return pkru;
90}
91
92static inline void wrpkru(u32 pkru)
93{
94 u32 ecx = 0, edx = 0;
95
96
97
98
99
100 asm volatile(".byte 0x0f,0x01,0xef\n\t"
101 : : "a" (pkru), "c"(ecx), "d"(edx));
102}
103
104static inline void __write_pkru(u32 pkru)
105{
106
107
108
109
110 if (pkru == rdpkru())
111 return;
112
113 wrpkru(pkru);
114}
115
116#else
117static inline u32 rdpkru(void)
118{
119 return 0;
120}
121
122static inline void __write_pkru(u32 pkru)
123{
124}
125#endif
126
127static inline void native_wbinvd(void)
128{
129 asm volatile("wbinvd": : :"memory");
130}
131
132extern asmlinkage void native_load_gs_index(unsigned);
133
134static inline unsigned long __read_cr4(void)
135{
136 return native_read_cr4();
137}
138
139#ifdef CONFIG_PARAVIRT_XXL
140#include <asm/paravirt.h>
141#else
142
143static inline unsigned long read_cr0(void)
144{
145 return native_read_cr0();
146}
147
148static inline void write_cr0(unsigned long x)
149{
150 native_write_cr0(x);
151}
152
153static inline unsigned long read_cr2(void)
154{
155 return native_read_cr2();
156}
157
158static inline void write_cr2(unsigned long x)
159{
160 native_write_cr2(x);
161}
162
163
164
165
166
167static inline unsigned long __read_cr3(void)
168{
169 return __native_read_cr3();
170}
171
172static inline void write_cr3(unsigned long x)
173{
174 native_write_cr3(x);
175}
176
177static inline void __write_cr4(unsigned long x)
178{
179 native_write_cr4(x);
180}
181
182static inline void wbinvd(void)
183{
184 native_wbinvd();
185}
186
187#ifdef CONFIG_X86_64
188
189static inline void load_gs_index(unsigned selector)
190{
191 native_load_gs_index(selector);
192}
193
194#endif
195
196#endif
197
198static inline void clflush(volatile void *__p)
199{
200 asm volatile("clflush %0" : "+m" (*(volatile char __force *)__p));
201}
202
203static inline void clflushopt(volatile void *__p)
204{
205 alternative_io(".byte " __stringify(NOP_DS_PREFIX) "; clflush %P0",
206 ".byte 0x66; clflush %P0",
207 X86_FEATURE_CLFLUSHOPT,
208 "+m" (*(volatile char __force *)__p));
209}
210
211static inline void clwb(volatile void *__p)
212{
213 volatile struct { char x[64]; } *p = __p;
214
215 asm volatile(ALTERNATIVE_2(
216 ".byte " __stringify(NOP_DS_PREFIX) "; clflush (%[pax])",
217 ".byte 0x66; clflush (%[pax])",
218 X86_FEATURE_CLFLUSHOPT,
219 ".byte 0x66, 0x0f, 0xae, 0x30",
220 X86_FEATURE_CLWB)
221 : [p] "+m" (*p)
222 : [pax] "a" (p));
223}
224
225#define nop() asm volatile ("nop")
226
227
228#endif
229
230#endif
231