Zephyr API Documentation 4.0.99
A Scalable Open Source RTOS
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timer.h
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1/*
2 * Copyright (c) 2019 Carlo Caione <ccaione@baylibre.com>
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7#ifndef ZEPHYR_INCLUDE_ARCH_ARM64_TIMER_H_
8#define ZEPHYR_INCLUDE_ARCH_ARM64_TIMER_H_
9
10#ifndef _ASMLANGUAGE
11
12#include <limits.h>
13
15#include <zephyr/types.h>
16#include <limits.h>
17
18#ifdef __cplusplus
19extern "C" {
20#endif
21
22#define ARM_ARCH_TIMER_IRQ ARM_TIMER_VIRTUAL_IRQ
23#define ARM_ARCH_TIMER_PRIO ARM_TIMER_VIRTUAL_PRIO
24#define ARM_ARCH_TIMER_FLAGS ARM_TIMER_VIRTUAL_FLAGS
25
27{
28#ifdef CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
29 extern int z_clock_hw_cycles_per_sec;
30 uint64_t cntfrq_el0 = read_cntfrq_el0();
31
32 __ASSERT(cntfrq_el0 < INT_MAX, "cntfrq_el0 cannot fit in system 'int'");
33 z_clock_hw_cycles_per_sec = (int) cntfrq_el0;
34#endif
35}
36
41
42static ALWAYS_INLINE void arm_arch_timer_enable(unsigned char enable)
43{
44 uint64_t cntv_ctl;
45
46 cntv_ctl = read_cntv_ctl_el0();
47
48 if (enable) {
49 cntv_ctl |= CNTV_CTL_ENABLE_BIT;
50 } else {
51 cntv_ctl &= ~CNTV_CTL_ENABLE_BIT;
52 }
53
54 write_cntv_ctl_el0(cntv_ctl);
55}
56
58{
59 uint64_t cntv_ctl;
60
61 cntv_ctl = read_cntv_ctl_el0();
62
63 if (mask) {
64 cntv_ctl |= CNTV_CTL_IMASK_BIT;
65 } else {
66 cntv_ctl &= ~CNTV_CTL_IMASK_BIT;
67 }
68
69 write_cntv_ctl_el0(cntv_ctl);
70}
71
76
77#ifdef __cplusplus
78}
79#endif
80
81#endif /* _ASMLANGUAGE */
82
83#endif /* ZEPHYR_INCLUDE_ARCH_ARM64_TIMER_H_ */
static ALWAYS_INLINE uint64_t read_cntvct_el0(void)
Definition lib_helpers.h:64
static ALWAYS_INLINE uint64_t read_cntfrq_el0(void)
Definition lib_helpers.h:58
static ALWAYS_INLINE uint64_t read_cntv_ctl_el0(void)
Definition lib_helpers.h:62
static ALWAYS_INLINE void write_cntv_ctl_el0(uint64_t val)
Definition lib_helpers.h:62
static ALWAYS_INLINE void write_cntv_cval_el0(uint64_t val)
Definition lib_helpers.h:63
#define CNTV_CTL_ENABLE_BIT
Definition cpu.h:85
#define CNTV_CTL_IMASK_BIT
Definition cpu.h:86
static ALWAYS_INLINE uint64_t arm_arch_timer_count(void)
Definition armv8_timer.h:63
static ALWAYS_INLINE void arm_arch_timer_set_irq_mask(bool mask)
Definition armv8_timer.h:48
static ALWAYS_INLINE void arm_arch_timer_set_compare(uint64_t val)
Definition armv8_timer.h:28
static ALWAYS_INLINE void arm_arch_timer_enable(unsigned char enable)
Definition armv8_timer.h:33
static ALWAYS_INLINE void arm_arch_timer_init(void)
Definition armv8_timer.h:24
#define ALWAYS_INLINE
Definition common.h:129
#define INT_MAX
Definition limits.h:39
__UINT64_TYPE__ uint64_t
Definition stdint.h:91