]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1965aae3 PA |
2 | #ifndef _ASM_X86_PVCLOCK_H |
3 | #define _ASM_X86_PVCLOCK_H | |
7af192c9 | 4 | |
7ac87074 | 5 | #include <asm/clocksource.h> |
7af192c9 GH |
6 | #include <asm/pvclock-abi.h> |
7 | ||
8 | /* some helper functions for xen and kvm pv clock sources */ | |
a5a1d1c2 | 9 | u64 pvclock_clocksource_read(struct pvclock_vcpu_time_info *src); |
2697902b | 10 | u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src); |
424c32f1 | 11 | void pvclock_set_flags(u8 flags); |
3807f345 | 12 | unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src); |
7af192c9 GH |
13 | void pvclock_read_wallclock(struct pvclock_wall_clock *wall, |
14 | struct pvclock_vcpu_time_info *vcpu, | |
e27c4929 | 15 | struct timespec64 *ts); |
e7a3481c | 16 | void pvclock_resume(void); |
7af192c9 | 17 | |
d63285e9 MT |
18 | void pvclock_touch_watchdogs(void); |
19 | ||
3aed64f6 PB |
20 | static __always_inline |
21 | unsigned pvclock_read_begin(const struct pvclock_vcpu_time_info *src) | |
22 | { | |
23 | unsigned version = src->version & ~1; | |
24 | /* Make sure that the version is read before the data. */ | |
25 | virt_rmb(); | |
26 | return version; | |
27 | } | |
28 | ||
29 | static __always_inline | |
30 | bool pvclock_read_retry(const struct pvclock_vcpu_time_info *src, | |
31 | unsigned version) | |
32 | { | |
33 | /* Make sure that the version is re-read after the data. */ | |
34 | virt_rmb(); | |
35 | return unlikely(version != src->version); | |
36 | } | |
37 | ||
347bb444 ZA |
38 | /* |
39 | * Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction, | |
40 | * yielding a 64-bit result. | |
41 | */ | |
42 | static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift) | |
43 | { | |
44 | u64 product; | |
45 | #ifdef __i386__ | |
46 | u32 tmp1, tmp2; | |
de2d1a52 ZA |
47 | #else |
48 | ulong tmp; | |
347bb444 ZA |
49 | #endif |
50 | ||
51 | if (shift < 0) | |
52 | delta >>= -shift; | |
53 | else | |
54 | delta <<= shift; | |
55 | ||
56 | #ifdef __i386__ | |
57 | __asm__ ( | |
58 | "mul %5 ; " | |
59 | "mov %4,%%eax ; " | |
60 | "mov %%edx,%4 ; " | |
61 | "mul %5 ; " | |
62 | "xor %5,%5 ; " | |
63 | "add %4,%%eax ; " | |
64 | "adc %5,%%edx ; " | |
65 | : "=A" (product), "=r" (tmp1), "=r" (tmp2) | |
66 | : "a" ((u32)delta), "1" ((u32)(delta >> 32)), "2" (mul_frac) ); | |
67 | #elif defined(__x86_64__) | |
68 | __asm__ ( | |
3b217116 | 69 | "mulq %[mul_frac] ; shrd $32, %[hi], %[lo]" |
de2d1a52 ZA |
70 | : [lo]"=a"(product), |
71 | [hi]"=d"(tmp) | |
72 | : "0"(delta), | |
73 | [mul_frac]"rm"((u64)mul_frac)); | |
347bb444 ZA |
74 | #else |
75 | #error implement me! | |
76 | #endif | |
77 | ||
78 | return product; | |
79 | } | |
80 | ||
dce2db0a | 81 | static __always_inline |
a5a1d1c2 | 82 | u64 __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src, u64 tsc) |
dce2db0a | 83 | { |
108b249c | 84 | u64 delta = tsc - src->tsc_timestamp; |
a5a1d1c2 | 85 | u64 offset = pvclock_scale_delta(delta, src->tsc_to_system_mul, |
3aed64f6 PB |
86 | src->tsc_shift); |
87 | return src->system_time + offset; | |
dce2db0a MT |
88 | } |
89 | ||
71056ae2 MT |
90 | struct pvclock_vsyscall_time_info { |
91 | struct pvclock_vcpu_time_info pvti; | |
71056ae2 MT |
92 | } __attribute__((__aligned__(SMP_CACHE_BYTES))); |
93 | ||
94 | #define PVTI_SIZE sizeof(struct pvclock_vsyscall_time_info) | |
71056ae2 | 95 | |
9f08890a JM |
96 | #ifdef CONFIG_PARAVIRT_CLOCK |
97 | void pvclock_set_pvti_cpu0_va(struct pvclock_vsyscall_time_info *pvti); | |
98 | struct pvclock_vsyscall_time_info *pvclock_get_pvti_cpu0_va(void); | |
99 | #else | |
100 | static inline struct pvclock_vsyscall_time_info *pvclock_get_pvti_cpu0_va(void) | |
101 | { | |
102 | return NULL; | |
103 | } | |
104 | #endif | |
105 | ||
1965aae3 | 106 | #endif /* _ASM_X86_PVCLOCK_H */ |