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kernel: expose k_busy_wait() to user mode

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If we just had the kernel's implementation, we could
just move this to lib/, but possible arch-specific
implementations dictate that we just make this a
syscall.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2018-11-14 14:29:24 -08:00 • committed by Anas Nashif
commit 42cfd4ff26
6 changed files with 23 additions and 11 deletions
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4
boards/posix/nrf52_bsim/k_busy_wait.c
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@ -14,9 +14,9 @@
* Will block this thread (and therefore the whole zephyr) during usec_to_wait * Will block this thread (and therefore the whole zephyr) during usec_to_wait
* *
* Note that interrupts may be received in the meanwhile and that therefore this * Note that interrupts may be received in the meanwhile and that therefore this
* thread may loose context * thread may lose context
*/ */
void k_busy_wait(u32_t usec_to_wait) void z_arch_busy_wait(u32_t usec_to_wait)
{ {
bs_time_t time_end = tm_get_hw_time() + usec_to_wait; bs_time_t time_end = tm_get_hw_time() + usec_to_wait;

2
drivers/timer/native_posix_timer.c
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@ -125,7 +125,7 @@ int z_clock_driver_init(struct device *device)
* Note that interrupts may be received in the meanwhile and that therefore this * Note that interrupts may be received in the meanwhile and that therefore this
* thread may loose context * thread may loose context
*/ */
void k_busy_wait(u32_t usec_to_wait) void z_arch_busy_wait(u32_t usec_to_wait)
{ {
u64_t time_end = hwm_get_time() + usec_to_wait; u64_t time_end = hwm_get_time() + usec_to_wait;

2
include/kernel.h
View file

@ -800,7 +800,7 @@ __syscall s32_t k_sleep(s32_t duration);
* *
* @return N/A * @return N/A
*/ */
extern void k_busy_wait(u32_t usec_to_wait); __syscall void k_busy_wait(u32_t usec_to_wait);
/** /**
* @brief Yield the current thread. * @brief Yield the current thread.

4
kernel/include/kernel_internal.h
View file

@ -227,6 +227,10 @@ extern u32_t z_early_boot_rand32_get(void);
extern int z_stack_adjust_initialized; extern int z_stack_adjust_initialized;
#endif #endif
#if defined(CONFIG_ARCH_HAS_CUSTOM_BUSY_WAIT)
extern void z_arch_busy_wait(u32_t usec_to_wait);
#endif
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif

18
kernel/thread.c
View file

@ -94,9 +94,10 @@ int _is_thread_essential(void)
return _current->base.user_options & K_ESSENTIAL; return _current->base.user_options & K_ESSENTIAL;
} }
#if !defined(CONFIG_ARCH_HAS_CUSTOM_BUSY_WAIT) #ifdef CONFIG_SYS_CLOCK_EXISTS
void k_busy_wait(u32_t usec_to_wait) void _impl_k_busy_wait(u32_t usec_to_wait)
{ {
#if !defined(CONFIG_ARCH_HAS_CUSTOM_BUSY_WAIT)
/* use 64-bit math to prevent overflow when multiplying */ /* use 64-bit math to prevent overflow when multiplying */
u32_t cycles_to_wait = (u32_t)( u32_t cycles_to_wait = (u32_t)(
(u64_t)usec_to_wait * (u64_t)usec_to_wait *
@ -113,8 +114,19 @@ void k_busy_wait(u32_t usec_to_wait)
break; break;
} }
} }
#else
z_arch_busy_wait(usec_to_wait);
#endif /* CONFIG_ARCH_HAS_CUSTOM_BUSY_WAIT */
} }
#endif
#ifdef CONFIG_USERSPACE
Z_SYSCALL_HANDLER(k_busy_wait, usec_to_wait)
{
_impl_k_busy_wait(usec_to_wait);
return 0;
}
#endif /* CONFIG_USERSPACE */
#endif /* CONFIG_SYS_CLOCK_EXISTS */
#ifdef CONFIG_THREAD_CUSTOM_DATA #ifdef CONFIG_THREAD_CUSTOM_DATA
void _impl_k_thread_custom_data_set(void *value) void _impl_k_thread_custom_data_set(void *value)

4
soc/posix/inf_clock/posix_board_if.h
View file

@ -25,10 +25,6 @@ void posix_irq_handler(void);
void posix_exit(int exit_code); void posix_exit(int exit_code);
u64_t posix_get_hw_cycle(void); u64_t posix_get_hw_cycle(void);
#if defined(CONFIG_ARCH_HAS_CUSTOM_BUSY_WAIT)
void k_busy_wait(u32_t usec_to_wait);
#endif
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif