1/* i386 cpu.h */
2
3static inline uint64_t rdtsc(void)
4{
5    uint64_t v;
6    asm volatile("rdtsc" : "=A" (v));
7    return v;
8}
9
10static inline uint32_t rdtscl(void)
11{
12    uint32_t v;
13    asm volatile("rdtsc" : "=a" (v) : : "edx");
14    return v;
15}
16
17static inline void cpuid_count(uint32_t op, uint32_t cnt,
18			       uint32_t * eax, uint32_t * ebx,
19			       uint32_t * ecx, uint32_t * edx)
20{
21    asm volatile("movl %%ebx,%1 ; "
22		 "cpuid ; "
23		 "xchgl %1,%%ebx"
24		 : "=a" (*eax), "=SD" (*ebx), "=c" (*ecx), "=d" (*edx)
25		 : "a"(op), "c"(cnt));
26}
27
28static inline void cpuid(uint32_t op, uint32_t * eax, uint32_t * ebx,
29			 uint32_t * ecx, uint32_t * edx)
30{
31    cpuid_count(op, 0, eax, ebx, ecx, edx);
32}
33
34static inline __constfunc uint32_t cpuid_eax(uint32_t level)
35{
36    uint32_t v;
37
38    asm volatile("pushl %%ebx ; "
39		 "cpuid ; "
40		 "popl %%ebx"
41		 : "=a" (v)
42		 : "a"(level)
43		 : "ecx", "edx");
44    return v;
45}
46
47static inline __constfunc uint32_t cpuid_ebx(uint32_t level)
48{
49    uint32_t v;
50
51    asm volatile("movl %%ebx,%0 ; "
52		 "cpuid ; "
53		 "xchgl %0,%%ebx"
54		 : "=SD" (v), "+a" (level)
55		 : : "ecx", "edx");
56    return v;
57}
58
59static inline __constfunc uint32_t cpuid_ecx(uint32_t level)
60{
61    uint32_t v;
62
63    asm volatile("pushl %%ebx ; "
64		 "cpuid ; "
65		 "popl %%ebx"
66		 : "=c" (v), "+a" (level)
67		 : : "edx");
68    return v;
69}
70
71static inline __constfunc uint32_t cpuid_edx(uint32_t level)
72{
73    uint32_t v;
74
75    asm volatile("pushl %%ebx ; "
76		 "cpuid ; "
77		 "popl %%ebx"
78		 : "=d" (v), "+a" (level)
79		 : : "ecx");
80    return v;
81}
82
83static inline uint64_t rdmsr(uint32_t msr)
84{
85    uint64_t v;
86
87    asm volatile("rdmsr" : "=A" (v) : "c"(msr));
88    return v;
89}
90
91static inline void wrmsr(uint64_t v, uint32_t msr)
92{
93    asm volatile("wrmsr" : : "A" (v), "c" (msr));
94}
95
96static inline void cpu_relax(void)
97{
98    asm volatile("rep ; nop" : : : "memory");
99}
100
101static inline void hlt(void)
102{
103    asm volatile("hlt" : : : "memory");
104}
105
106static inline void cli(void)
107{
108    asm volatile("cli" : : : "memory");
109}
110
111static inline void sti(void)
112{
113    asm volatile("sti" : : : "memory");
114}
115