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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * ARM Generic Timer specific interface
4 */
5
6#ifndef SELFTEST_KVM_ARCH_TIMER_H
7#define SELFTEST_KVM_ARCH_TIMER_H
8
9#include "processor.h"
10
11enum arch_timer {
12 VIRTUAL,
13 PHYSICAL,
14};
15
16#define CTL_ENABLE (1 << 0)
17#define CTL_IMASK (1 << 1)
18#define CTL_ISTATUS (1 << 2)
19
20#define msec_to_cycles(msec) \
21 (timer_get_cntfrq() * (uint64_t)(msec) / 1000)
22
23#define usec_to_cycles(usec) \
24 (timer_get_cntfrq() * (uint64_t)(usec) / 1000000)
25
26#define cycles_to_usec(cycles) \
27 ((uint64_t)(cycles) * 1000000 / timer_get_cntfrq())
28
29static inline uint32_t timer_get_cntfrq(void)
30{
31 return read_sysreg(cntfrq_el0);
32}
33
34static inline uint64_t timer_get_cntct(enum arch_timer timer)
35{
36 isb();
37
38 switch (timer) {
39 case VIRTUAL:
40 return read_sysreg(cntvct_el0);
41 case PHYSICAL:
42 return read_sysreg(cntpct_el0);
43 default:
44 GUEST_FAIL("Unexpected timer type = %u", timer);
45 }
46
47 /* We should not reach here */
48 return 0;
49}
50
51static inline void timer_set_cval(enum arch_timer timer, uint64_t cval)
52{
53 switch (timer) {
54 case VIRTUAL:
55 write_sysreg(cval, cntv_cval_el0);
56 break;
57 case PHYSICAL:
58 write_sysreg(cval, cntp_cval_el0);
59 break;
60 default:
61 GUEST_FAIL("Unexpected timer type = %u", timer);
62 }
63
64 isb();
65}
66
67static inline uint64_t timer_get_cval(enum arch_timer timer)
68{
69 switch (timer) {
70 case VIRTUAL:
71 return read_sysreg(cntv_cval_el0);
72 case PHYSICAL:
73 return read_sysreg(cntp_cval_el0);
74 default:
75 GUEST_FAIL("Unexpected timer type = %u", timer);
76 }
77
78 /* We should not reach here */
79 return 0;
80}
81
82static inline void timer_set_tval(enum arch_timer timer, int32_t tval)
83{
84 switch (timer) {
85 case VIRTUAL:
86 write_sysreg(tval, cntv_tval_el0);
87 break;
88 case PHYSICAL:
89 write_sysreg(tval, cntp_tval_el0);
90 break;
91 default:
92 GUEST_FAIL("Unexpected timer type = %u", timer);
93 }
94
95 isb();
96}
97
98static inline int32_t timer_get_tval(enum arch_timer timer)
99{
100 isb();
101 switch (timer) {
102 case VIRTUAL:
103 return read_sysreg(cntv_tval_el0);
104 case PHYSICAL:
105 return read_sysreg(cntp_tval_el0);
106 default:
107 GUEST_FAIL("Could not get timer %d\n", timer);
108 }
109
110 /* We should not reach here */
111 return 0;
112}
113
114static inline void timer_set_ctl(enum arch_timer timer, uint32_t ctl)
115{
116 switch (timer) {
117 case VIRTUAL:
118 write_sysreg(ctl, cntv_ctl_el0);
119 break;
120 case PHYSICAL:
121 write_sysreg(ctl, cntp_ctl_el0);
122 break;
123 default:
124 GUEST_FAIL("Unexpected timer type = %u", timer);
125 }
126
127 isb();
128}
129
130static inline uint32_t timer_get_ctl(enum arch_timer timer)
131{
132 switch (timer) {
133 case VIRTUAL:
134 return read_sysreg(cntv_ctl_el0);
135 case PHYSICAL:
136 return read_sysreg(cntp_ctl_el0);
137 default:
138 GUEST_FAIL("Unexpected timer type = %u", timer);
139 }
140
141 /* We should not reach here */
142 return 0;
143}
144
145static inline void timer_set_next_cval_ms(enum arch_timer timer, uint32_t msec)
146{
147 uint64_t now_ct = timer_get_cntct(timer);
148 uint64_t next_ct = now_ct + msec_to_cycles(msec);
149
150 timer_set_cval(timer, next_ct);
151}
152
153static inline void timer_set_next_tval_ms(enum arch_timer timer, uint32_t msec)
154{
155 timer_set_tval(timer, msec_to_cycles(msec));
156}
157
158static inline u32 vcpu_get_vtimer_irq(struct kvm_vcpu *vcpu)
159{
160 u32 intid;
161 u64 attr;
162
163 attr = vcpu_has_el2(vcpu) ? KVM_ARM_VCPU_TIMER_IRQ_HVTIMER :
164 KVM_ARM_VCPU_TIMER_IRQ_VTIMER;
165 vcpu_device_attr_get(vcpu, KVM_ARM_VCPU_TIMER_CTRL, attr, &intid);
166
167 return intid;
168}
169
170static inline u32 vcpu_get_ptimer_irq(struct kvm_vcpu *vcpu)
171{
172 u32 intid;
173 u64 attr;
174
175 attr = vcpu_has_el2(vcpu) ? KVM_ARM_VCPU_TIMER_IRQ_HPTIMER :
176 KVM_ARM_VCPU_TIMER_IRQ_PTIMER;
177 vcpu_device_attr_get(vcpu, KVM_ARM_VCPU_TIMER_CTRL, attr, &intid);
178
179 return intid;
180}
181
182#endif /* SELFTEST_KVM_ARCH_TIMER_H */